阅读说明：本技术 一种叶丝加料的加工参数的控制方法及系统 (Method and system for controlling processing parameters of cut tobacco charging ) 是由 刘穗君 刘颖 杨光露 李新会 文金昉 郭亚东 袁源 杨甦 崔岩 杨林超 刘磊 于 2021-03-18 设计创作，主要内容包括：本发明提供一种叶丝加料的加工参数的控制方法及系统,该方法包括：获取引射料液的蒸汽压力和热风温度,并将料液按所述蒸汽压力投射到加料机内的叶丝上。获取叶丝的出口含水率的目标值和实测值,并计算得到出口含水率的目标偏差值。建立出口含水率的PID反馈控制模型,并根据所述目标偏差值调节所述热风温度,以使叶丝的出口含水率按所述目标值进行控制。本发明能解决现有叶丝加料时缺少对加工参数的有效调控,易造成料液利用率较低的问题,能提高批次内叶丝的出口含水率和热风温度的稳定性,提升生产过程质量控制能力。(The invention provides a method and a system for controlling processing parameters of cut tobacco charging, wherein the method comprises the following steps: and acquiring the steam pressure and the hot air temperature of the injection material liquid, and projecting the material liquid onto the cut tobacco in the charging machine according to the steam pressure. And acquiring a target value and an actual measurement value of the outlet moisture content of the cut tobacco, and calculating to obtain a target deviation value of the outlet moisture content. And establishing a PID feedback control model of the outlet water content, and adjusting the hot air temperature according to the target deviation value so as to control the outlet water content of the cut tobacco according to the target value. The invention can solve the problems that the existing cut tobacco is lack of effective regulation and control on processing parameters during feeding, and the utilization rate of feed liquid is low, can improve the outlet water content of cut tobacco in batches and the stability of hot air temperature, and improves the quality control capability in the production process.)

1. A method for controlling processing parameters of cut tobacco feeding is characterized by comprising the following steps:

acquiring steam pressure and hot air temperature of injection feed liquid, projecting the feed liquid onto cut tobacco in a feeding machine according to the steam pressure if the steam pressure is in a set range, and adjusting the steam pressure or the hot air speed to uniformly spray the feed liquid;

obtaining a target value and an actual measurement value of the outlet moisture content of the cut tobacco, and calculating to obtain a target deviation value of the outlet moisture content;

and establishing a PID feedback control model of the outlet water content, and adjusting the hot air temperature according to the target deviation value so as to control the outlet water content of the cut tobacco according to the target value.

2. The method for controlling processing parameters of cut tobacco charging according to claim 1, further comprising:

acquiring the inlet water content of the cut tobacco, and calculating the average inlet water content of the cut tobacco by taking N-time collection in a set time period as a sliding window;

establishing an inlet moisture content sliding window of n times of sampling including the current moment, and calculating to obtain the difference value between the inlet moisture content of each moment and the average inlet moisture content;

and if the difference values corresponding to all the moments in one sliding window are larger than or smaller than 0, controlling the temperature of the hot air to start to decrease or increase at the outlet moment corresponding to the first moment of the sliding window so as to perform feedforward control on the outlet moisture content of the cut tobacco.

3. The method for controlling processing parameters of cut tobacco charging according to claim 2, further comprising:

and acquiring the hot air speed, and controlling the frequency of the hot air fan to be reduced or increased to adjust the hot air speed if the measured value of the water content of the cut tobacco outlet is larger than or smaller than the target value.

4. The method for controlling processing parameters of cut tobacco charging according to claim 3, further comprising:

and acquiring a humidifying water ratio, and controlling the humidifying water ratio to be reduced or increased if the measured value of the water content at the cut tobacco outlet is larger than or smaller than the target value.

5. The method for controlling processing parameters of cut tobacco charging according to claim 4, further comprising:

and acquiring the moisture exhaust air volume, and controlling the opening degree of the moisture exhaust air door to be reduced or increased if the measured value of the cut tobacco outlet moisture content is larger than or smaller than the target value.

6. A system for controlling processing parameters of cut tobacco charging is characterized by comprising:

the feed liquid control unit is used for acquiring the steam pressure and the hot air temperature of the injection feed liquid and projecting the feed liquid onto the cut tobacco in the feeding machine according to the steam pressure;

the outlet moisture content acquisition unit is used for acquiring a target value and an actual measurement value of the outlet moisture content of the cut tobacco and calculating to obtain a target deviation value of the outlet moisture content;

and the PID feedback control unit is used for establishing a PID feedback control model of the water content at the outlet and adjusting the temperature of the hot air according to the target deviation value so as to control the water content at the outlet of the cut tobacco according to the target value.

7. The system for controlling processing parameters of cut tobacco charging according to claim 6, further comprising:

the inlet water content acquisition unit is used for acquiring the inlet water content of the cut tobacco and calculating the average inlet water content of the cut tobacco by taking N-time acquisition in a set time period as a sliding window;

the difference value calculating unit is used for establishing an inlet moisture content sliding window of n times of sampling including the current moment, and calculating to obtain the difference value between the inlet moisture content of each moment and the average inlet moisture content;

and the feedforward control unit is used for controlling the temperature of the hot air to start to decrease or increase at the outlet time corresponding to the first time of the sliding window when the difference values corresponding to all the times in the sliding window are greater than or less than 0 so as to perform feedforward control on the outlet moisture content of the cut tobacco.

8. The system for controlling processing parameters of cut tobacco charging according to claim 7, further comprising:

and the wind speed adjusting unit is used for acquiring the wind speed of the hot wind, and controlling the frequency of the hot wind fan to be reduced or increased to adjust the wind speed of the hot wind if the measured value of the moisture content of the cut tobacco outlet is greater than or less than the target value.

9. The system for controlling processing parameters of cut tobacco charging according to claim 8, further comprising:

and the humidifying water adjusting unit is used for acquiring a humidifying water proportion, and controlling the humidifying water proportion to be reduced or increased if the measured value of the cut tobacco outlet water content is larger than or smaller than the target value.

10. The system for controlling processing parameters of tobacco shred feeding according to claim 9, further comprising:

and the moisture discharge adjusting unit is used for acquiring moisture discharge air volume, and controlling the opening degree of the moisture discharge air door to be reduced or increased if the measured value of the moisture content of the cut tobacco outlet is greater than or less than the target value.

Technical Field

The invention relates to the technical field of tobacco processing, in particular to a method and a system for controlling processing parameters of cut tobacco feeding.

Background

The cut tobacco charging is an important technical process in the production and processing process of tobacco, the feed liquid is applied to the cut tobacco according to the formula requirement, the irritation and the miscellaneous gas of the tobacco are reduced through the charging process, and the sensory quality and the physical characteristics of the tobacco are improved. In the existing cigarette shred manufacturing process, feed liquid is mixed and sprayed with steam through a nozzle, so that poor consistency of sensory quality of cigarette products is easily caused due to lack of effective regulation and control on processing parameters, the utilization rate of the feed liquid is low, and the quality and the production efficiency of tobacco shred production are influenced.

Disclosure of Invention

The invention provides a method and a system for controlling processing parameters of cut tobacco feeding, solves the problems that the existing cut tobacco feeding lacks effective regulation and control on the processing parameters and is easy to cause lower feed liquid utilization rate, and can improve the outlet water content of cut tobacco in batches and the stability of hot air temperature 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 method for controlling processing parameters of cut tobacco feeding comprises the following steps:

acquiring steam pressure and hot air temperature of injection feed liquid, projecting the feed liquid onto cut tobacco in a feeding machine according to the steam pressure if the steam pressure is in a set range, and adjusting the steam pressure or the hot air speed to uniformly spray the feed liquid;

obtaining a target value and an actual measurement value of the outlet moisture content of the cut tobacco, and calculating to obtain a target deviation value of the outlet moisture content;

and establishing a PID feedback control model of the outlet water content, and adjusting the hot air temperature according to the target deviation value so as to control the outlet water content of the cut tobacco according to the target value.

Preferably, the method further comprises the following steps:

acquiring the inlet water content of the cut tobacco, and calculating the average inlet water content of the cut tobacco by taking N-time collection in a set time period as a sliding window;

establishing an inlet moisture content sliding window of n times of sampling including the current moment, and calculating to obtain the difference value between the inlet moisture content of each moment and the average inlet moisture content;

and if the difference values corresponding to all the moments in one sliding window are larger than or smaller than 0, controlling the temperature of the hot air to start to decrease or increase at the outlet moment corresponding to the first moment of the sliding window so as to perform feedforward control on the outlet moisture content of the cut tobacco.

Preferably, the method further comprises the following steps:

and acquiring the hot air speed, and controlling the frequency of the hot air fan to be reduced or increased to adjust the hot air speed if the measured value of the water content of the cut tobacco outlet is larger than or smaller than the target value.

Preferably, the method further comprises the following steps:

and acquiring a humidifying water ratio, and controlling the humidifying water ratio to be reduced or increased if the measured value of the water content at the cut tobacco outlet is larger than or smaller than the target value.

Preferably, the method further comprises the following steps:

and acquiring the moisture exhaust air volume, and controlling the opening degree of the moisture exhaust air door to be reduced or increased if the measured value of the cut tobacco outlet moisture content is larger than or smaller than the target value.

The invention also provides a system for controlling processing parameters of cut tobacco charging, which comprises:

the feed liquid control unit is used for acquiring the steam pressure and the hot air temperature of the injection feed liquid and projecting the feed liquid onto the cut tobacco in the feeding machine according to the steam pressure;

the outlet moisture content acquisition unit is used for acquiring a target value and an actual measurement value of the outlet moisture content of the cut tobacco and calculating to obtain a target deviation value of the outlet moisture content;

and the PID feedback control unit is used for establishing a PID feedback control model of the water content at the outlet and adjusting the temperature of the hot air according to the target deviation value so as to control the water content at the outlet of the cut tobacco according to the target value.

Preferably, the method further comprises the following steps:

the inlet water content acquisition unit is used for acquiring the inlet water content of the cut tobacco and calculating the average inlet water content of the cut tobacco by taking N-time acquisition in a set time period as a sliding window;

the difference value calculating unit is used for establishing an inlet moisture content sliding window of n times of sampling including the current moment, and calculating to obtain the difference value between the inlet moisture content of each moment and the average inlet moisture content;

and the feedforward control unit is used for controlling the temperature of the hot air to start to decrease or increase at the outlet time corresponding to the first time of the sliding window when the difference values corresponding to all the times in the sliding window are greater than or less than 0 so as to perform feedforward control on the outlet moisture content of the cut tobacco.

Preferably, the method further comprises the following steps:

and the wind speed adjusting unit is used for acquiring the wind speed of the hot wind, and controlling the frequency of the hot wind fan to be reduced or increased to adjust the wind speed of the hot wind if the measured value of the moisture content of the cut tobacco outlet is greater than or less than the target value.

Preferably, the method further comprises the following steps:

and the humidifying water adjusting unit is used for acquiring a humidifying water proportion, and controlling the humidifying water proportion to be reduced or increased if the measured value of the cut tobacco outlet water content is larger than or smaller than the target value.

Preferably, the method further comprises the following steps:

and the moisture discharge adjusting unit is used for acquiring moisture discharge air volume, and controlling the opening degree of the moisture discharge air door to be reduced or increased if the measured value of the moisture content of the cut tobacco outlet is greater than or less than the target value.

The invention provides a method and a system for controlling processing parameters of cut tobacco feeding, wherein PID feedback control is carried out through a target value of outlet water content and a deviation value of an actual measurement value, so that the outlet water content is controlled according to the target value, the problems that the existing cut tobacco feeding lacks effective regulation and control on the processing parameters, and the feed liquid utilization rate is low are solved, the outlet water content of cut tobacco in batches and the stability of hot air temperature can be improved, and the quality control capability in the production process is improved.

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 method for controlling processing parameters of cut tobacco charging provided by the invention.

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

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 of low utilization rate of feed liquid in the current tobacco shred feeding process. The invention provides a method and a system for controlling processing parameters of cut tobacco feeding, wherein PID feedback control is carried out through a target value of outlet water content and a deviation value of an actual measurement value, so that the outlet water content is controlled according to the target value, the problems that the existing cut tobacco feeding lacks effective regulation and control on the processing parameters, and the feed liquid utilization rate is low are solved, the outlet water content of cut tobacco in batches and the stability of hot air temperature can be improved, and the quality control capability in the production process is improved.

As shown in fig. 1, a method for controlling processing parameters of cut tobacco feeding comprises the following steps:

s1: and acquiring the steam pressure and the hot air temperature of the injection material liquid, projecting the material liquid onto the cut tobacco in the feeding machine according to the steam pressure if the steam pressure is in a set range, and adjusting the steam pressure or the hot air speed to uniformly spray the material liquid.

S2: and acquiring a target value and an actual measurement value of the outlet moisture content of the cut tobacco, and calculating to obtain a target deviation value of the outlet moisture content.

S3: and establishing a PID feedback control model of the outlet water content, and adjusting the hot air temperature according to the target deviation value so as to control the outlet water content of the cut tobacco according to the target value.

Specifically, the uniformity of liquid spraying can be adjusted by adjusting the steam pressure for injecting the liquid, if the steam pressure is too low, the spraying range may be small, and the spray drops generated in hot air impact are large, so that the spraying is not uniform. In order to make the spraying uniform, the wind speed of the hot air can be properly reduced when the steam pressure is too small, and the wind speed of the hot air can be adaptively increased when the steam pressure is too large, so that smaller fog drops are formed. The cut tobacco is fed into the charging equipment in the cut tobacco charging process, and charging technological parameters are adjusted during cut tobacco charging, wherein the more critical charging technological parameters comprise: the pressure of the strip material steam, the temperature of the feeding hot air, the speed of the hot air controlled by the frequency of a hot air fan of the feeding equipment and the like. According to the method, a PID feedback control model is established, a deviation value of an actually measured value and a target value of the outlet water content is used as an input of PID feedback control, and parameter values of the regulating P, I and the regulating D are further determined through self-adaptive learning so as to realize control of the outlet water content. If the measured value of the water content of the outlet is larger than the target value, performing temperature rise control on the hot air temperature through a PID feedback control model; and if the measured value of the outlet water content is smaller than the target value, performing temperature reduction control on the hot air temperature through a PID feedback control model, and further adjusting the outlet water content. The method can improve the stability of controlling the water content of the outlet in the batch and improve the quality control capability in the production process.

As shown in fig. 2, the method further comprises:

s4: and acquiring the inlet water content of the cut tobacco, and calculating the average inlet water content of the cut tobacco by taking N-time collection in a set time period as a sliding window.

S5: and establishing an inlet moisture content sliding window of n times of sampling including the current moment, and calculating to obtain the difference value between the inlet moisture content of each moment and the average inlet moisture content.

S6: and if the difference values corresponding to all the moments in one sliding window are larger than or smaller than 0, controlling the temperature of the hot air to start to decrease or increase at the outlet moment corresponding to the first moment of the sliding window so as to perform feedforward control on the outlet moisture content of the cut tobacco.

In practical application, in order to identify the variation trend of the inlet moisture content of the cut tobacco, a method of moving a sliding window can be adopted for monitoring, the inlet moisture content of a plurality of cut tobacco incoming materials is collected within a set time period, and the average inlet moisture content is obtained through calculation. And establishing a sliding window to monitor the difference value between the current inlet water content and the average inlet water content, if the difference values are both larger than or smaller than 0, indicating that the inlet water content of the cut tobacco incoming material has a trend increase or trend decrease, and performing feed-forward control on the hot air temperature through the prejudgment to enable the outlet water content to reach a target value, so that the fluctuation of the outlet water content can be reduced, and the stability of the production process quality is improved.

The method further comprises the following steps:

s7: and acquiring the hot air speed, and controlling the frequency of the hot air fan to be reduced or increased to adjust the hot air speed if the measured value of the water content of the cut tobacco outlet is larger than or smaller than the target value.

In practical application, the hot air speed influences the moisture content of the cut tobacco leaves at the outlet, and the larger the hot air speed is, the faster the water and air in the cut tobacco leaves volatilize. And when the measured value of the water content at the outlet of the cut tobacco is larger than or smaller than the target value, controlling the hot air speed by controlling the frequency of the hot air fan so as to control the water content at the outlet of the cut tobacco according to the target value.

The method further comprises the following steps:

s8: and acquiring a humidifying water ratio, and controlling the humidifying water ratio to be reduced or increased if the measured value of the water content at the cut tobacco outlet is larger than or smaller than the target value.

In practical application, in order to enable the feed liquid to be uniformly sprayed on the cut tobacco, the concentration of the feed liquid can be controlled through the humidifying water proportion, of course, if the humidifying water proportion is large, the water content of the cut tobacco outlet can be increased, but if the humidifying water proportion is too small, the feed liquid concentration can be caused to be too large, and the spraying is not uniform. When the measured value of the water content at the cut tobacco outlet is larger than or smaller than the target value, the water content at the outlet can be adjusted by reducing or increasing the humidifying water ratio.

The method further comprises the following steps:

and acquiring the moisture exhaust air volume, and controlling the opening degree of the moisture exhaust air door to be reduced or increased if the measured value of the cut tobacco outlet moisture content is larger than or smaller than the target value.

In practical application, the moisture-discharging air quantity directly influences the humidity in the feeding machine, and when the moisture-discharging air quantity is increased, the moisture of the feeding machine can be reduced, so that the moisture content of the outlet of the cut tobacco is reduced. And when the measured value of the water content of the cut tobacco outlet is larger than or smaller than the target value, controlling the reduction or increase of the opening degree of the moisture exhaust air door to adjust the moisture exhaust air volume so as to adjust the water content of the cut tobacco outlet.

Therefore, the method for controlling the processing parameters of cut tobacco feeding provided by the invention has the advantages that the target value and the deviation value of the measured value of the outlet water content, the hot air temperature, the hot air speed, the humidifying water proportion or the moisture exhaust air quantity are adjusted, so that the outlet water content is controlled according to the target value, the problems that the processing parameters are lack of effective regulation and control during the existing cut tobacco feeding, the feed liquid utilization rate is low are solved, the stability of the outlet water content and the hot air temperature of cut tobacco in batches can be improved, and the quality control capability in the production process is improved.

Correspondingly, the invention also provides a system for controlling the processing parameters of cut tobacco charging, which comprises: and the material liquid control unit is used for acquiring the steam pressure and the hot air temperature for injecting the material liquid and projecting the material liquid onto the cut tobacco in the charging machine according to the steam pressure. And the outlet water content acquisition unit is used for acquiring a target value and an actual measurement value of the outlet water content of the cut tobacco and calculating to obtain a target deviation value of the outlet water content. And the PID feedback control unit is used for establishing a PID feedback control model of the water content at the outlet and adjusting the temperature of the hot air according to the target deviation value so as to control the water content at the outlet of the cut tobacco according to the target value.

The system further comprises: and the inlet water content acquisition unit is used for acquiring the inlet water content of the cut tobacco and calculating the average inlet water content of the cut tobacco by taking N-time acquisition in a set time period as a sliding window. And the difference value calculating unit is used for establishing an inlet water content sliding window of n times of sampling including the current moment, and calculating to obtain the difference value between the inlet water content of each moment and the average inlet water content. And the feedforward control unit is used for controlling the temperature of the hot air to start to decrease or increase at the outlet time corresponding to the first time of the sliding window when the difference values corresponding to all the times in the sliding window are greater than or less than 0 so as to perform feedforward control on the outlet moisture content of the cut tobacco.

The system further comprises:

and the wind speed adjusting unit is used for acquiring the wind speed of the hot wind, and controlling the frequency of the hot wind fan to be reduced or increased to adjust the wind speed of the hot wind if the measured value of the moisture content of the cut tobacco outlet is greater than or less than the target value.

And the humidifying water adjusting unit is used for acquiring a humidifying water proportion, and controlling the humidifying water proportion to be reduced or increased if the measured value of the cut tobacco outlet water content is larger than or smaller than the target value.

And the moisture discharge adjusting unit is used for acquiring moisture discharge air volume, and controlling the opening degree of the moisture discharge air door to be reduced or increased if the measured value of the moisture content of the cut tobacco outlet is greater than or less than the target value.

Therefore, the invention provides a system for controlling processing parameters of cut tobacco feeding, PID feedback control is carried out through the target value of the outlet water content and the deviation value of an actual measurement value, so that the outlet water content is controlled according to the target value, the problems that the existing cut tobacco feeding lacks effective regulation and control on the processing parameters, and the feed liquid utilization rate is low are solved, the outlet water content of cut tobacco in batches and the stability of hot air temperature can be improved, and the quality control capability in the production process is improved.

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.