Method for improving charging and perfuming precision

Abstract

The invention discloses a method for improving the charging and perfuming precision, which corrects the application proportion in real time by monitoring the charging and perfuming cumulative precision, reduces the deviation of the cumulative precision of material liquid and perfuming liquid caused by large instantaneous flow fluctuation, internal pipeline resistance of a charging and perfuming system, systematic error, material liquid viscosity and the like, and improves the accuracy of charging and perfuming. The precision of the feeding and perfuming initial stage is close to zero quickly, the precision of the feeding and perfuming process is kept to be zero, and the precision of feeding and perfuming tailings is not far away from zero in the final stage. And meanwhile, according to the actual condition of the system, the correction coefficient can be individually set for the consistent system deviation, so that the system error is eliminated as far as possible, and the precision is infinitely close to 0.

Description

Technical Field

[0001] The invention relates to the technical field of tobacco production, and in particular to a method for improving the accuracy of adding materials and flavoring. Background Art

[0002] Adding flavors is an important process in the tobacco industry's silk production line. Accurately and evenly applying liquid material and flavor liquid to the material according to the formula can reduce irritation, make the smoke soft and delicate, improve the aftertaste, and give tobacco products a beautiful and comfortable olfactory aroma, give tobacco products a characteristic aroma, and make the smoke full. Therefore, adding flavors to cigarettes has an important impact on improving and stabilizing cigarette quality, especially on cigarette style.

[0003] The feeding and flavoring system usually consists of an electronic scale before flavoring, a PLC control system, a gear pump, a mass flow meter, an air compressor pipeline system, and a dual-medium nozzle. Among them, the PLC collects the instantaneous flow of the material on the electronic scale before flavoring in real time, and outputs the theoretical instantaneous flow of flavoring according to the set flavoring ratio through delayed calculation and precision tracking. The actuator tracks the theoretical instantaneous flow of flavoring in real time according to the program setting. Since the cumulative amount is composed of the accumulation of instantaneous flow, the purpose of controlling the cumulative accuracy of mixed yarn flavoring is achieved.

[0004] In actual production sites, there are two types of metering equipment for the feeding and flavoring process: control type and metering type. Control type metering equipment can provide a stable flow rate for the feeding and flavoring device, achieving higher accuracy in the application of liquid material and fragrance liquid, but requires a quantitative feeding device to provide a stable material flow rate; while metering type metering equipment is mostly limited in space and cannot install a quantitative feeding device, and can only perform simple metering of the material, resulting in a large fluctuation in the basic data of the material flow rate given to the feeding and flavoring device, so that the flow rate of liquid material and fragrance liquid is also in a fluctuating state, resulting in a large deviation in the accuracy of feeding and flavoring. Summary of the invention

[0005] The purpose of the present invention is to provide a method for improving the accuracy of adding materials and flavoring in order to solve the above-mentioned problems, and a control method for improving the accuracy of adding materials and flavoring on a tobacco production line, especially for a feeding process in which the liquid material is viscous and prone to precipitation, the accuracy improvement effect is more obvious.

[0006] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0007] The present invention provides a method for improving the accuracy of adding materials and flavoring, comprising the following steps:

[0008] Step 001: The centralized control system transmits the material adding and flavoring ratio of the brand issued by the central control system to the material adding and flavoring device;

[0009] Step 002: The centralized control system transmits the instantaneous flow and cumulative amount signals of the electronic scale to the feeding and flavoring device, and performs a delay in the feeding and flavoring device. The delay time is the time it takes for the material to run from the electronic scale to the entrance of the feeding and flavoring cylinder;

[0010] Step 003: The feeding and fragrance adding device calculates the set flow rate according to the set ratio based on the instantaneous flow rate of the electronic scale after the delay. The feeding and fragrance adding device calculates the operating frequency of the feeding pump and the fragrance adding pump in real time according to the PID control mode by comparing the actual feed liquid and fragrance liquid flow rates measured by the flow meter with the set feed liquid and fragrance liquid flow rates, and implements the application of feed liquid and fragrance liquid in proportion.

[0011] Set flow rate = instantaneous flow rate of electronic scale * set ratio;

[0012] Step 004: Due to the large fluctuation of instantaneous flow of the metering scale, the internal pipeline resistance of the feeding and fragrance system, systematic errors, and the viscosity of the feed liquid, the actual application accuracy of the feed liquid and the fragrance liquid may have large deviations, especially at the beginning and end of production, the instantaneous large fluctuation of the scale flow leads to untimely PID control, resulting in large accuracy deviations, and intervention is required; obtain the cumulative amount of feeding and fragrance during actual production, and the cumulative amount after the delay of the electronic scale, and calculate and compare the actual feeding and fragrance ratio and cumulative accuracy;

[0013] Actual proportion of adding materials and flavoring = (cumulative amount of adding materials and flavoring / cumulative amount after delay on electronic scale)*100%;

[0014] Cumulative accuracy = (actual feeding and fragrance ratio - set feeding and fragrance ratio) / set feeding and fragrance ratio * 100%;

[0015] Step 005: According to the requirement that the cumulative accuracy is close to 0, the actual execution ratio of adding materials and flavoring is corrected according to the degree of deviation of the cumulative accuracy.

[0016] Correct the actual application ratio according to the following table:

[0017] Set flow rate = instantaneous flow rate of electronic scale * (set ratio * ratio correction coefficient);

[0018] Cumulative accuracy Proportional correction factor Cumulative accuracy Proportional correction factor <-0.5 1.1 >0.5 0.9 -0.5≤Cumulative accuracy<-0.1 1.05 0.1<Cumulative accuracy≤0.5 0.95 -0.1≤Cumulative accuracy<-0.05 1.01 0.05<Cumulative accuracy≤0.1 0.99 -0.05≤Cumulative accuracy<-0.01 1.005 0.01<Cumulative accuracy≤0.05 0.995 -0.01≤Cumulative accuracy<0 1 0<Cumulative accuracy≤0.01 1

[0019] The beneficial effects of the present invention are as follows: the present invention corrects the application ratio in real time by monitoring the cumulative accuracy of feeding and flavoring, reduces the deviation of the cumulative accuracy of feed liquid and fragrance liquid caused by large instantaneous flow fluctuation, internal pipeline resistance of the feeding and flavoring system, systematic error, feed liquid viscosity and the like, and realizes that the initial accuracy of feeding and flavoring approaches zero rapidly, the accuracy of the feeding and flavoring process is kept at 0, and the accuracy of the tail of feeding and flavoring does not far from 0 at the end. At the same time, according to the actual situation of the system, the correction coefficient can be personalized for the consistent system deviation, so as to eliminate the system error as much as possible and realize the accuracy infinitely close to 0. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the basic process flow chart for adding ingredients and flavoring;

[0021] Figure 2 It is a flow chart of the control of adding materials and flavoring in the prior art;

[0022] Figure 3 It is a schematic diagram of the method for controlling the addition of materials and flavoring in the present invention. DETAILED DESCRIPTION

[0023] In order to make the objectives, technical solutions and advantages of the present invention clearer, the implementation method of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0025] Example

[0026] The process flow of adding shredded stems Figure 1 The electronic scale before adding the shredded stems detects the material flow and cumulative amount, and the measured data is transmitted to the shredded stem feeding device through the centralized control system. Due to the difference in physical position, the shredded stem feeding device delays the obtained material flow and cumulative amount signals and performs flow control calculation.

[0027] The shredded stem feeding device receives the feeding ratio of the corresponding recipe through the centralized control system.

[0028] The shredded stem feeding device calculates the set feeding flow rate according to the set ratio based on the instantaneous flow rate of the electronic scale after the delay. The feeding device calculates the operating frequency of the feeding pump in real time according to the PID control method by comparing the actual feed liquid flow rate measured by the flowmeter with the set feed liquid flow rate, and implements the proportional application of feed liquid.

[0029] The electronic scale before adding the shredded stems is a controlled electronic scale with a stable flow rate. However, during the application of the liquid, due to the high viscosity of the liquid solute, the solute gradually precipitates during the production process, resulting in an increase in the output resistance of the feeding pump, which causes the actual feeding amount to always be less than the theoretical feeding amount, and the feeding accuracy mostly varies around -0.1.

[0030] In the prior art, the feeding flow rate is forced to be reduced or amplified by 10% only in the stage where the accuracy is greater than 0.5 or -0.5 during the feeding stage. However, the accuracy range of -0.5 to 0.5 is only adjusted by PID during the process, which cannot meet higher accuracy requirements.

[0031] In order to further improve the precision control capability in this embodiment, a multi-interval proportional adjustment coefficient is implemented.

[0032] Cumulative accuracy Proportional correction factor Cumulative accuracy Proportional correction factor <-0.5 1.1 >0.5 0.9 -0.5≤Cumulative accuracy<-0.1 1.05 0.1<Cumulative accuracy≤0.5 0.95 -0.1≤Cumulative accuracy<-0.05 1.01 0.05<Cumulative accuracy≤0.1 0.99 -0.05≤Cumulative accuracy<-0.01 1.005 0.01<Cumulative accuracy≤0.05 0.995 -0.01≤Cumulative accuracy<0 1 0<Cumulative accuracy≤0.01 1

[0033] Taking into account the situation where the output resistance of the feeding pump increases due to the precipitation of the slurry in the production process, the weight of the proportional correction coefficient in the negative accuracy interval is increased accordingly, thereby increasing the positive deviation of the actual feeding amount, and achieving infinite approach to 0 of accuracy through multi-interval asymmetric coefficient adjustment.

[0034] Actual implementation results: Since the implementation of the multi-interval asymmetric coefficient adjustment mode, the accuracy of adding shredded stems has been maintained between -0.0086 and 0.0095. This indicator is at the leading level in the industry.

[0035] Although the present invention is described herein with reference to the illustrative embodiments of the present invention, the above embodiments are only preferred embodiments of the present invention, and the embodiments of the present invention are not limited to the above embodiments. It should be understood that those skilled in the art can design many other modifications and embodiments, which will fall within the scope and spirit of the principles disclosed in this application.

Claims

1. A method for improving the accuracy of adding materials and flavoring, characterized in that: The following steps are involved: Step 001: The centralized control system transmits the material adding and flavoring ratio of the brand issued by the central control system to the material adding and flavoring device; Step 002: The centralized control system transmits the instantaneous flow and cumulative amount signals of the electronic scale to the feeding and flavoring device, and performs a delay in the feeding and flavoring device. The delay time is the time it takes for the material to run from the electronic scale to the entrance of the feeding and flavoring cylinder; Step 003: The feeding and fragrance adding device calculates the set flow rate according to the set ratio based on the instantaneous flow rate of the electronic scale after the delay. The feeding and fragrance adding device calculates the operating frequency of the feeding pump and the fragrance adding pump in real time according to the PID control mode by comparing the actual feed liquid and fragrance liquid flow rates measured by the flow meter with the set feed liquid and fragrance liquid flow rates, and implements the application of feed liquid and fragrance liquid in proportion. Step 004: Obtain the cumulative amount of adding materials and flavoring during actual production, and the cumulative amount after the electronic scale delay, and calculate and compare the actual proportion of adding materials and flavoring and the cumulative accuracy; Step 005: According to the requirement that the cumulative accuracy is close to 0, the actual execution ratio of adding materials and flavoring is corrected according to the degree of deviation of the cumulative accuracy.

2. A method for improving the accuracy of adding materials and flavoring according to claim 1, characterized in that: The relationship between the set flow rate, the instantaneous flow rate of the electronic scale and the set ratio in step 003 is: set flow rate = instantaneous flow rate of the electronic scale * set ratio.

3. A method for improving the accuracy of adding materials and flavoring according to claim 1 or 2, characterized in that: The relationship between the actual feeding and fragrance ratio, the cumulative amount of feeding and fragrance and the cumulative amount after the electronic scale delay in the step 004 is: actual feeding and fragrance ratio = (cumulative amount of feeding and fragrance / cumulative amount after the electronic scale delay) * 100%, the cumulative accuracy = (actual feeding and fragrance ratio - set feeding and fragrance ratio) / set feeding and fragrance ratio*100%.

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