阅读说明：本技术 一种叶丝超级回潮的加水控制方法及系统 (Water adding control method and system for super moisture regain of cut tobacco ) 是由 刘穗君 刘颖 曹兴强 李新会 文金昉 郭亚东 袁源 杨甦 王玉建 叶帛 杨光露 于 2021-03-18 设计创作，主要内容包括：本发明提供一种叶丝超级回潮的加水控制方法及系统,该方法包括：获取叶丝来料含水率,并对设定时间段内的N次采样作为一个滑窗来计算来料平均含水率。再建立一个包括当前时刻在内的n次采样的来料含水率滑窗,并计算得到各个时刻的来料含水率与所述来料平均含水率的差值。如果一个滑窗内的所有时刻所对应的所述差值都大于或小于0,则判断来料含水率出现了整体性的增大趋势或减小趋势,并控制回潮机水泵的转速在滑窗第一个时刻所对应的出口时刻开始减小或增大,以对超级回潮滚筒的加水量进行调整,使叶丝出口含水率进行前馈控制。本发明能提高各批次叶丝的出口含水率的一致性,提升生产过程质量控制能力。(The invention provides a water adding control method and a water adding control system for super moisture regain of cut tobacco, wherein the method comprises the following steps: and acquiring the moisture content of the cut tobacco incoming material, and taking N times of sampling in a set time period as a sliding window to calculate the average moisture content of the incoming material. And establishing a sliding window of the moisture content of the incoming material sampled for n times including the current moment, and calculating to obtain the difference value between the moisture content of the incoming material at each moment and the average moisture content of the incoming material. And if the difference values corresponding to all the moments in one sliding window are larger than or smaller than 0, judging that the water content of the incoming material has an integral increasing trend or a integral decreasing trend, and controlling the rotating speed of the water pump of the damping machine to start to decrease or increase at the outlet moment corresponding to the first moment of the sliding window so as to adjust the water adding amount of the super damping roller and perform feedforward control on the water content of the cut tobacco outlet. The method can improve the consistency of the water content of the outlet of each batch of cut tobacco and improve the quality control capability of the production process.)

1. A water adding control method for super moisture regain of cut tobacco is characterized by comprising the following steps:

acquiring the moisture content of the cut tobacco incoming material, and taking N times of sampling in a set time period as a sliding window to calculate the average moisture content of the incoming material;

establishing a sliding window of the moisture content of the incoming material sampled for n times including the current moment, and calculating to obtain the difference value between the moisture content of the incoming material at each moment and the average moisture content of the incoming material;

and if the difference values corresponding to all the moments in one sliding window are larger than or smaller than 0, judging that the water content of the incoming material has an integral increasing trend or a integral decreasing trend, and controlling the rotating speed of the water pump of the damping machine to start to decrease or increase at the outlet moment corresponding to the first moment of the sliding window so as to adjust the water adding amount of the super damping roller and perform feedforward control on the water content of the cut tobacco outlet.

2. The method for controlling the addition of water to the super-dampening of cut tobacco according to claim 1, further comprising:

establishing a first corresponding table of the outlet water content of the cut tobacco and the steam flow, and determining the initial steam flow according to the target value of the outlet water content of the cut tobacco so as to heat and humidify the cut tobacco in the super-dampening roller;

and when the difference values corresponding to all the moments in one sliding window are greater than or less than 0, controlling the opening of the steam valve to start to reduce or increase at the outlet moment corresponding to the first moment of the sliding window so as to adjust the steam flow to carry out feed-forward control on the water content of the cut tobacco outlet.

3. The method for controlling the addition of water to the super-dampening of cut tobacco according to claim 2, further comprising:

and establishing a second corresponding table of the water content of the outlet of the cut tobacco and the moisture discharge flow, and controlling the opening of the moisture discharge valve according to the target value so as to adjust the water content of the outlet of the cut tobacco.

4. The method for controlling the addition of water to the super-dampening of cut tobacco according to claim 3, further comprising:

acquiring measured values of the outlet moisture content of the cut tobacco, and acquiring target deviation values of the outlet moisture content according to the target values and the measured values;

and establishing a water content PID feedback control model for adjusting the rotating speed of the water pump of the damping machine according to the target deviation value so as to perform feedback control on the outlet water content and control the outlet water content of the cut tobacco in the batch according to the target value.

5. The method for controlling the addition of water to the super-dampening of cut tobacco according to claim 4, further comprising:

establishing an EWMA feedback control model of the outlet water content, and carrying out exponential weighted moving average operation on the outlet water content according to the EWMA feedback control modelCalculating to obtain EWMA statistic Z_S；

In thatOrJudging whether the water content at the outlet is in an increasing trend or a decreasing trend, wherein T is a target value of the water content at the outlet, lambda is an EWMA smoothing coefficient, sigma is a standard deviation under a stable process state, and K is a constant;

according to the EWMA statistic Z_SAnd performing feedback control on the water adding amount to reduce the fluctuation of the water content at the outlet.

6. The method for controlling addition of water to the super leaf shred dampening of claim 5, wherein the EWMA statistic Z_SCalculated according to the following formula:

Z_S＝λ·y_S+(1-λ)Z_S-1wherein Z is₀＝T，λ＝2，y_SThe moisture content of the outlet at the S-th moment.

7. The utility model provides a water control system that adds of super dampening of cut tobacco which characterized in that includes:

the incoming material moisture content acquisition unit is used for acquiring the moisture content of the incoming cut tobacco and calculating the average moisture content of the incoming material by taking N times of sampling in a set time period as a sliding window;

the difference value calculating unit is used for establishing a sliding window of the moisture content of the incoming material sampled for n times including the current moment, and calculating to obtain the difference value between the moisture content of the incoming material at each moment and the average moisture content of the incoming material;

and the feedforward control unit is used for judging that the water content of the supplied materials has an integral increasing trend or a decreasing trend when the difference values corresponding to all moments in one sliding window are larger than or smaller than 0, and controlling the rotating speed of the water pump of the damping machine to start to decrease or increase at the outlet moment corresponding to the first moment of the sliding window so as to adjust the water adding amount of the super damping roller and perform feedforward control on the water content of the cut tobacco outlet.

8. The cut tobacco super-conditioning watering control system according to claim 7, further comprising:

the steam flow control unit is used for establishing a first corresponding table of the outlet water content of the cut tobacco and the steam flow, and determining the initial steam flow according to the target value of the outlet water content of the cut tobacco so as to heat and humidify the cut tobacco in the super-remoistening roller;

and the steam flow control unit is also used for controlling the opening of the steam valve to start to reduce or increase at the outlet moment corresponding to the first moment of the sliding window when the difference values corresponding to all the moments in the sliding window are greater than or less than 0 so as to adjust the steam flow to carry out feed-forward control on the water content of the cut tobacco outlet.

9. The cut tobacco super-conditioning watering control system according to claim 8, further comprising:

and the moisture discharge valve control unit is used for establishing a second corresponding table of the water content of the outlet of the cut tobacco and the moisture discharge flow, and controlling the opening of the moisture discharge valve according to the target value so as to adjust the water content of the outlet of the cut tobacco.

10. The cut tobacco super-conditioning watering control system according to claim 9, further comprising:

the deviation value acquisition unit is used for acquiring the measured value of the outlet water content of the cut tobacco and obtaining a target deviation value of the outlet water content according to the target value and the measured value;

and the PID feedback control unit is used for establishing a water content PID feedback control model and is used for adjusting the rotating speed of the moisture regaining machine water pump according to the target deviation value so as to perform feedback control on the outlet water content and control the outlet water content of the cut tobacco in the batch according to the target value.

Technical Field

The invention relates to the technical field of tobacco shred processing control, in particular to a water adding control method and system for super moisture regain of tobacco shreds.

Background

In the tobacco shred making process of cigarettes, tobacco shreds are easy to dry due to the fact that tobacco shreds are smashed greatly by high-temperature expansion, and high-yield tobacco shreds are not easy to obtain. The tobacco shreds are usually subjected to super-conditioning before being dried so as to add water into the tobacco shreds, so that the water content of the tobacco shreds is increased to 30-40%, and the tobacco shreds entering a dryer at a higher temperature are ensured, so that the tobacco shreds can be quickly dehydrated by adopting a lower working air temperature of air flow, and the aim of drying is fulfilled. In the existing tobacco shred super-conditioning, the water content at the outlet of the tobacco shred is mainly controlled by adjusting the water adding amount after the detection feedback of the water content at the outlet, but the adjustment has hysteresis and cannot accurately adjust the water content at the outlet of the tobacco shred in time, so that the water content at the outlet of the tobacco shred in a batch is not uniform, the process indexes of each subsequent process are influenced, and the quality control of the production process is not facilitated.

Disclosure of Invention

The invention provides a water adding control method and system for super-conditioning of cut tobacco, which solve the problems that the adjustment of the water content of an outlet is lagged and inaccurate when the existing cut tobacco is super-conditioned, can improve the consistency of the water content of the outlet of each batch of cut tobacco, and improve the quality control capability in the production process.

In order to achieve the above purpose, the invention provides the following technical scheme:

a water adding control method for super moisture regain of cut tobacco comprises the following steps:

acquiring the moisture content of the cut tobacco incoming material, and taking N times of sampling in a set time period as a sliding window to calculate the average moisture content of the incoming material;

establishing a sliding window of the moisture content of the incoming material sampled for n times including the current moment, and calculating to obtain the difference value between the moisture content of the incoming material at each moment and the average moisture content of the incoming material;

and if the difference values corresponding to all the moments in one sliding window are larger than or smaller than 0, judging that the water content of the incoming material has an integral increasing trend or a integral decreasing trend, and controlling the rotating speed of the water pump of the damping machine to start to decrease or increase at the outlet moment corresponding to the first moment of the sliding window so as to adjust the water adding amount of the super damping roller and perform feedforward control on the water content of the cut tobacco outlet.

Preferably, the method further comprises the following steps:

establishing a first corresponding table of the outlet water content of the cut tobacco and the steam flow, and determining the initial steam flow according to the target value of the outlet water content of the cut tobacco so as to heat and humidify the cut tobacco in the super-dampening roller;

and when the difference values corresponding to all the moments in one sliding window are greater than or less than 0, controlling the opening of the steam valve to start to reduce or increase at the outlet moment corresponding to the first moment of the sliding window so as to adjust the steam flow to carry out feed-forward control on the water content of the cut tobacco outlet.

Preferably, the method further comprises the following steps:

and establishing a second corresponding table of the water content of the outlet of the cut tobacco and the moisture discharge flow, and controlling the opening of the moisture discharge valve according to the target value so as to adjust the water content of the outlet of the cut tobacco.

Preferably, the method further comprises the following steps:

acquiring measured values of the outlet moisture content of the cut tobacco, and acquiring target deviation values of the outlet moisture content according to the target values and the measured values;

and establishing a water content PID feedback control model for adjusting the rotating speed of the water pump of the damping machine according to the target deviation value so as to perform feedback control on the outlet water content and control the outlet water content of the cut tobacco in the batch according to the target value.

Preferably, the method further comprises the following steps:

establishing an EWMA feedback control model of the outlet water content, and performing exponential weighted moving average operation on the outlet water content according to the EWMA feedback control model to obtain EWMA statistic Z_S；

In thatOrJudging whether the water content at the outlet is in an increasing trend or a decreasing trend, wherein T is a target value of the water content at the outlet, lambda is an EWMA smoothing coefficient, sigma is a standard deviation under a stable process state, and K is a constant;

according to the EWMA statistic Z_SAnd performing feedback control on the water adding amount to reduce the fluctuation of the water content at the outlet.

Preferably, the EWMA statistic Z_SCalculated according to the following formula:

Z_S＝λ·y_S+(1-λ)Z_S-1wherein Z is₀＝T，λ＝2，y_SThe moisture content of the outlet at the S-th moment.

The invention also provides a water adding control system for super moisture regain of cut tobacco, which comprises:

the incoming material moisture content acquisition unit is used for acquiring the moisture content of the incoming cut tobacco and calculating the average moisture content of the incoming material by taking N times of sampling in a set time period as a sliding window;

the difference value calculating unit is used for establishing a sliding window of the moisture content of the incoming material sampled for n times including the current moment, and calculating to obtain the difference value between the moisture content of the incoming material at each moment and the average moisture content of the incoming material;

and the feedforward control unit is used for judging that the water content of the supplied materials has an integral increasing trend or a decreasing trend when the difference values corresponding to all moments in one sliding window are larger than or smaller than 0, and controlling the rotating speed of the water pump of the damping machine to start to decrease or increase at the outlet moment corresponding to the first moment of the sliding window so as to adjust the water adding amount of the super damping roller and perform feedforward control on the water content of the cut tobacco outlet.

Preferably, the method further comprises the following steps:

the steam flow control unit is used for establishing a first corresponding table of the outlet water content of the cut tobacco and the steam flow, and determining the initial steam flow according to the target value of the outlet water content of the cut tobacco so as to heat and humidify the cut tobacco in the super-remoistening roller;

and the steam flow control unit is also used for controlling the opening of the steam valve to start to reduce or increase at the outlet moment corresponding to the first moment of the sliding window when the difference values corresponding to all the moments in the sliding window are greater than or less than 0 so as to adjust the steam flow to carry out feed-forward control on the water content of the cut tobacco outlet.

Preferably, the method further comprises the following steps:

and the moisture discharge valve control unit is used for establishing a second corresponding table of the water content of the outlet of the cut tobacco and the moisture discharge flow, and controlling the opening of the moisture discharge valve according to the target value so as to adjust the water content of the outlet of the cut tobacco.

Preferably, the method further comprises the following steps:

the deviation value acquisition unit is used for acquiring the measured value of the outlet water content of the cut tobacco and obtaining a target deviation value of the outlet water content according to the target value and the measured value;

and the PID feedback control unit is used for establishing a water content PID feedback control model and is used for adjusting the rotating speed of the moisture regaining machine water pump according to the target deviation value so as to perform feedback control on the outlet water content and control the outlet water content of the cut tobacco in the batch according to the target value.

The invention provides a water adding control method and system for super-conditioning of cut tobacco.

Drawings

In order to more clearly describe the specific embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below.

FIG. 1 is a schematic view of a water addition control method for super moisture regain of cut tobacco provided by the present invention.

FIG. 2 is a schematic diagram of a feed-forward control method for the water content at the outlet of cut tobacco provided by the invention.

FIG. 3 is a schematic diagram of PID feedback control method for water content at outlet of cut tobacco.

Detailed Description

In order to make the technical field of the invention better understand the scheme of the embodiment of the invention, the embodiment of the invention is further described in detail with reference to the drawings and the implementation mode.

Aiming at the problem that adjustment of the outlet water content is delayed in the current super-dampening of the cut tobacco, the invention provides a water adding control method and system for super-dampening of the cut tobacco.

As shown in fig. 1, a water adding control method for super dampening of cut tobacco comprises the following steps:

s1: and acquiring the moisture content of the cut tobacco incoming material, and taking N times of sampling in a set time period as a sliding window to calculate the average moisture content of the incoming material.

S2: and establishing a sliding window of the moisture content of the incoming material sampled for n times including the current moment, and calculating to obtain the difference value between the moisture content of the incoming material at each moment and the average moisture content of the incoming material.

S3: and if the difference values corresponding to all the moments in one sliding window are larger than or smaller than 0, judging that the water content of the incoming material has an integral increasing trend or a integral decreasing trend, and controlling the rotating speed of the water pump of the damping machine to start to decrease or increase at the outlet moment corresponding to the first moment of the sliding window so as to adjust the water adding amount of the super damping roller and perform feedforward control on the water content of the cut tobacco outlet.

In practical application, in order to distinguish and identify the overall trend change of the water content of the outlet, a method of moving a sliding window can be adopted for monitoring. Firstly, because the moisture content of the supplied material of the cut tobacco is constantly changed, the current time is set as t, in order to determine the current change condition, the average moisture content of the supplied material can be calculated by taking the previous N times of sampling in a period of time as a sliding window, and the sliding window slides forwards along with the continuation of the production process. Secondly, in order to identify the trend change of the water content of the cut tobacco, a sliding window comprising n times of sampling can be established, and the difference value between the water content of the incoming material of the n times of sampling including the current moment and the corresponding average water content is calculated respectively. In order to avoid the influence of accidental changes, the change of the trend incoming material water content is identified, and a process quality control judgment criterion can be set. The method comprises the steps of establishing a sliding window of the moisture content of the incoming material, judging the change trend of the moisture content of the cut tobacco outlet, and controlling the rotating speed of a water pump of the damping machine to be reduced or increased when the moisture content of the incoming material is integrally increased or decreased, so as to adjust the water adding amount of the super damping roller and perform feedforward control on the moisture content of the cut tobacco outlet. The problem that the adjustment of the water content of the outlet of the existing cut tobacco is lagged and inaccurate is easily caused during super dampening can be solved, the consistency of the water content of the outlet of each batch of cut tobacco can be improved, and the quality control capability of the production process is improved.

The method further comprises the following steps:

s4: establishing a first corresponding table of the outlet water content of the cut tobacco and the steam flow, and determining the initial steam flow according to the target value of the outlet water content of the cut tobacco so as to heat and humidify the cut tobacco in the super-dampening roller.

S5: and when the difference values corresponding to all the moments in one sliding window are greater than or less than 0, controlling the opening of the steam valve to start to reduce or increase at the outlet moment corresponding to the first moment of the sliding window so as to adjust the steam flow to carry out feed-forward control on the water content of the cut tobacco outlet.

In practical application, because the steam flow also influences the moisture content of the outlet of the cut tobacco, the steam flow can influence the humidity and the humidity in the super dampening cylinder. When the water content of the outlet tends to increase or decrease, the steam flow is adjusted by controlling the opening of the steam valve, so that the water adding amount of the cut tobacco is controlled.

The method further comprises the following steps:

s6: and establishing a second corresponding table of the water content of the outlet of the cut tobacco and the moisture discharge flow, and controlling the opening of the moisture discharge valve according to the target value so as to adjust the water content of the outlet of the cut tobacco.

In practical application, the moisture discharge flow in the super moisture regaining cylinder also influences the moisture content of the outlet of the cut tobacco, and when the moisture content of the outlet is increased or decreased, the moisture discharge flow is adjusted by controlling the opening of the moisture discharge valve, so that the water adding amount of the cut tobacco is controlled.

The method further comprises the following steps:

s7: acquiring measured values of the outlet moisture content of the cut tobacco, and acquiring target deviation values of the outlet moisture content according to the target values and the measured values;

s8: and establishing a water content PID feedback control model for adjusting the rotating speed of the water pump of the damping machine according to the target deviation value so as to perform feedback control on the outlet water content and control the outlet water content of the cut tobacco in the batch according to the target value.

In practical application, the outlet water content is adjusted in real time through the PID feedback control model, an actual measurement value of the outlet water content is compared with a target value, then the actual measurement value is used as the input of the PID feedback control model according to a target deviation value, adaptive learning is carried out according to the input, parameter values of P, I and D are determined and adjusted, the rotating speed of the moisture regain machine water pump is controlled, the water adding amount is adjusted, control over the outlet water content is achieved, the stability of control over the outlet water content in batches can be improved, and the consistency of control among batches is increased.

The method further comprises the following steps:

s9: establishing an EWMA feedback control model of the outlet water content, and performing exponential weighted moving average operation on the outlet water content according to the EWMA feedback control model to obtain EWMA statistic Z_S。

In thatOrAnd judging that the water content at the outlet tends to increase or decrease, wherein T is a target value of the water content at the outlet, lambda is an EWMA smoothing coefficient, sigma is a standard deviation under a stable process state, and K is a constant.

According to the EWMA statistic Z_SAnd performing feedback control on the water adding amount to reduce the fluctuation of the water content at the outlet.

Further, the EWMA statistic Z_SCalculated according to the following formula:

Z_S＝λ·y_S+(1-λ)Z_S-1wherein Z is₀＝T，λ＝2，y_SThe moisture content of the outlet at the S-th moment.

The change of the water content of the outlet of the cut tobacco is fed back through EWMA statistics, the water adding amount is adjusted, the change fluctuation of the water content of the outlet is reduced, the consistency of the water content of the outlet of each batch of cut stems can be improved, and the quality control capability of the production process is improved.

Therefore, the invention provides the water adding control method for the super-conditioning of the cut tobacco, which judges the change trend of the water content of the cut tobacco outlet by establishing the incoming material water content sliding window so as to adjust the water adding amount, solves the problems that the adjustment of the water content of the outlet has hysteresis and is easy to cause inaccuracy during the super-conditioning of the existing cut tobacco, can improve the consistency of the water content of the outlet of each batch of cut tobacco, and improves the quality control capability of the production process.

Correspondingly, the invention also provides a water adding control system for super dampening of cut tobacco, which comprises: and the incoming material moisture content acquisition unit is used for acquiring the moisture content of the incoming cut tobacco and calculating the average moisture content of the incoming material by taking N times of sampling in a set time period as a sliding window. And the difference value calculating unit is used for establishing a sliding window of the moisture content of the incoming material sampled for n times including the current moment, and calculating to obtain the difference value between the moisture content of the incoming material at each moment and the average moisture content of the incoming material. And the feedforward control unit is used for judging that the water content of the supplied materials has an integral increasing trend or a decreasing trend when the difference values corresponding to all moments in one sliding window are larger than or smaller than 0, and controlling the rotating speed of the water pump of the damping machine to start to decrease or increase at the outlet moment corresponding to the first moment of the sliding window so as to adjust the water adding amount of the super damping roller and perform feedforward control on the water content of the cut tobacco outlet.

The system further comprises: and the steam flow control unit is used for establishing a first corresponding table of the outlet water content of the cut tobacco and the steam flow, and determining the initial steam flow according to the target value of the outlet water content of the cut tobacco so as to heat and humidify the cut tobacco in the super-dampening roller. And the steam flow control unit is also used for controlling the opening of the steam valve to start to reduce or increase at the outlet moment corresponding to the first moment of the sliding window when the difference values corresponding to all the moments in the sliding window are greater than or less than 0 so as to adjust the steam flow to carry out feed-forward control on the water content of the cut tobacco outlet.

The system further comprises: and the moisture discharge valve control unit is used for establishing a second corresponding table of the water content of the outlet of the cut tobacco and the moisture discharge flow, and controlling the opening of the moisture discharge valve according to the target value so as to adjust the water content of the outlet of the cut tobacco.

The system further comprises: and the deviation value acquisition unit is used for acquiring the measured value of the outlet water content of the cut tobacco and acquiring a target deviation value of the outlet water content according to the target value and the measured value. And the PID feedback control unit is used for establishing a water content PID feedback control model and is used for adjusting the rotating speed of the moisture regaining machine water pump according to the target deviation value so as to perform feedback control on the outlet water content and control the outlet water content of the cut tobacco in the batch according to the target value.

Therefore, the water adding control system for the super-conditioning of the cut tobacco provided by the invention judges the change trend of the water content of the cut tobacco outlet by establishing the incoming material water content sliding window so as to adjust the water adding amount, solves the problem that the adjustment of the water content of the outlet has hysteresis and is easy to cause inaccuracy in the super-conditioning of the existing cut tobacco, can improve the consistency of the water content of the outlet of each batch of cut tobacco, and improves the quality control capability in the production process.

The construction, features and functions of the present invention have been described in detail with reference to the embodiments shown in the drawings, but the present invention is not limited to the embodiments shown in the drawings, and all equivalent embodiments modified or modified by the spirit and scope of the present invention should be protected without departing from the spirit of the present invention.