A control method and a control device for the moisture content at the outlet of a feeding machine

Abstract

The present invention discloses a control method and a control device for the moisture content at the outlet of a feeder. A steam flow control valve is arranged at the outlet of the feeder, and the moisture content at the outlet of the feeder is controlled by adjusting the valve opening of the steam flow control valve. Among them, the control method includes: obtaining a first relational expression according to the ideal curve of the moisture content at the outlet of the feeder and time; respectively obtaining test data under different feeding modes, and the test data includes the moisture content at the outlet of each feeder corresponding to different valve openings at each set time point; constructing a second relational expression of the moisture content at the outlet of the feeder, the valve opening and time according to the test data; and obtaining the valve opening corresponding to each time point according to the first relational expression and the second relational expression. The present invention can improve the stability of the material moisture at the outlet of the feeder.

Description

Technical Field

[0001] The present invention relates to the technical field of tobacco processing, and particularly relates to a control method and a control device for the moisture content at the outlet of a flavoring machine. Background Art

[0002] In the cigarette industrial cut tobacco production process, the moisture content of cut tobacco is one of the most important parameters for evaluating the quality of cut tobacco. The cut tobacco production line can be divided into the leaf making section, the cut tobacco making section, the stem cut tobacco making section, and the blending and flavoring section. The leaf making section has a flavoring process. The main function of the flavoring process is to evenly add sugar materials to the material, and at the same time has the function of balancing moisture. The standard deviation of the moisture content at the outlet of the flavoring process reflects the stability of the moisture at the outlet of the flavoring machine. Poor stability will directly affect the stability of the moisture content of the incoming material in the subsequent cut tobacco drying process, and indirectly affect the stability and qualification rate of the final finished cut tobacco.

[0003] Currently, the moisture control of the material in the flavoring machine is mainly achieved by directly injecting steam at the inlet and outlet. Currently, the inlet steam is mainly responsible for the temperature control inside the cylinder through PID regulation, while the direct injection of steam at the outlet is a compensation control function for the temperature in the flavoring system. In actual production, when controlling the temperature through the PID system of the inlet steam, it is easy to have the problem of overshoot of the moisture at the material head, which in turn leads to unstable moisture content of the material at the outlet of the flavoring machine. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem of the stability of the moisture content of the material at the outlet of the flavoring machine. The present invention provides a control method and a control device for the moisture content at the outlet of a flavoring machine, which can improve the stability of the moisture content of the material at the outlet of the flavoring machine.

[0005] To solve the above technical problems, an embodiment of the present invention discloses a control method for the moisture content at the outlet of a flavoring machine. A steam flow control valve is provided at the outlet of the flavoring machine, and the moisture content at the outlet of the flavoring machine is controlled by adjusting the valve opening of the steam flow control valve. The control method includes:

[0006] Obtaining a first relational expression based on the ideal curve of the moisture content at the outlet of the flavoring machine and time;

[0007] Respectively obtaining test data under different flavoring modes. The test data includes the moisture content at the outlet of each flavoring machine corresponding to different valve openings at each set time point;

[0008] Constructing a second relational expression between the moisture content at the outlet of the flavoring machine, the valve opening, and time based on the test data;

[0009] Obtaining the valve opening corresponding to each time point according to the first relational expression and the second relational expression.

[0010] According to another specific embodiment of the present invention, the first relational expression is the Michaelis-Menten equation.

[0011] According to another specific embodiment of the present invention, the Michaelis-Menten equation is:

[0012]

[0013] where: t represents time, and Y represents the moisture content at the outlet of the feeder.

[0014] According to another specific embodiment of the present invention, the second relational expression is:

[0015] Y = 2.175 + 0.5058t - 0.1455x - 0.005681t 2 + 0.00439x 2 + 0.00038tx + 0.000017t 3 - 0.000018x 3 + 0.000013xt 2 - 0.000023tx 2

[0016] where: t represents time, x represents the valve opening, and Y represents the moisture content at the outlet of the feeder.

[0017] According to another specific embodiment of the present invention, the steam flow control valve is a diaphragm valve.

[0018] The embodiment of the present invention also discloses a control device for the moisture content at the outlet of the feeder. A steam flow control valve is arranged at the outlet of the feeder, and the moisture content at the outlet of the feeder is controlled by adjusting the valve opening of the steam flow control valve; the control device includes:

[0019] A first relational expression construction module, configured to obtain a first relational expression according to the ideal curve of the moisture content at the outlet of the feeder and time;

[0020] A data acquisition module, configured to respectively acquire test data under different feeding modes, and the test data includes the moisture content at the outlet of each feeder corresponding to different valve openings at each set time point;

[0021] A second relational expression construction module, configured to construct a second relational expression of the moisture content at the outlet of the feeder with the valve opening and time according to the test data;

[0022] A steam valve control module, configured to obtain the valve opening corresponding to each time point according to the first relational expression and the second relational expression.

[0023] According to another specific embodiment of the present invention, the first relational expression is the Michaelis-Menten equation.

[0024] According to another specific embodiment of the present invention, the Michaelis-Menten equation is:

[0025]

[0026] In the formula: t represents time, and Y represents the moisture content at the outlet of the feeder.

[0027] According to another specific embodiment of the present invention, the second relational expression is:

[0028] Y = 2.175 + 0.5058t - 0.1455x - 0.005681t 2 + 0.00439x 2 + 0.00038tx + 0.000017t 3 - 0.000018x 3 + 0.000013xt 2 - 0.000023tx 2

[0029] In the formula: t represents time, x represents the valve opening degree, and Y represents the moisture content at the outlet of the feeder.

[0030] According to another specific embodiment of the present invention, the steam flow control valve is a diaphragm valve.

[0031] The present invention provides a control method and a control device for the moisture content at the outlet of a feeder. A steam flow control valve is arranged at the outlet of the feeder, and the moisture content at the outlet of the feeder is controlled by controlling the valve opening degree of the steam flow control valve. The present invention obtains a first relational expression through an ideal curve of the relationship between the moisture content at the outlet of the feeder and time. In addition, by testing each group of test data in different modes and statistically analyzing the test data, a second relational expression of the moisture content at the outlet of the feeder with respect to the valve opening degree and time is obtained. Then, the valve opening degree of the steam flow control valve corresponding to each time point is obtained through the first relational expression and the second relational expression, solving the problem that the moisture content of the material at the outlet of the existing feeder is unstable, improving the stability of the moisture of the material at the outlet of the feeder, and improving the qualification rate of cut tobacco. Description of the Drawings

[0032] Figure 1 Show the moisture trend graph at the outlet of the feeder in the prior art;

[0033] Figure 2 Show a schematic diagram of the control method for the moisture content at the outlet of the feeder provided by an embodiment of the present invention;

[0034] Figure 3 Show the ideal curve graph of the moisture content of the material at the outlet of the feeder in an embodiment of the present invention. Specific Embodiments

[0035] The following specific embodiments illustrate the implementation manners of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention will be introduced in conjunction with preferred embodiments, this does not mean that the features of this invention are limited to this implementation manner. On the contrary, the purpose of introducing the invention in conjunction with the implementation manner is to cover other alternatives or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, many specific details will be included in the following description. The present invention can also be implemented without these details. In addition, in order to avoid confusing or obscuring the key points of the present invention, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0036] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0037] The terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0038] In the description of this embodiment, it should also be noted that unless otherwise clearly specified and limited, the term "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this embodiment can be understood according to specific situations.

[0039] To make the purpose, technical solutions, and advantages of the present invention clearer, the following will further describe the implementation manners of the present invention in detail with reference to the drawings.

[0040] The applicant found that as Figure 1 shown, Figure 1It is the moisture trend chart at the outlet of a certain batch of feeding machines. It can be seen from the chart that in the first 8 minutes, the moisture trend of the material head is unstable, the material head overshoots seriously, and the moisture of the material head is too high. When the temperature PID system of the steam at the inlet of the feeding machine is corrected, it will cause a trough and repeated oscillations, thus increasing the fluctuations in the first 15 - 20 minutes. The main reason for this problem is that although the inlet steam of the feeding machine is responsible for controlling the temperature inside the cylinder through PID regulation, the direct injection steam at the outlet is the compensation control of the temperature in the feeding system. Since there is no control and regulation mechanism for the direct injection steam at the outlet, the outlet steam valve can only control the opening and closing and cannot adjust the valve opening. When the material runs in the cylinder of the feeding machine, the flow rate increases from small to large. However, during the process of the material flow of the material head increasing from small to large, due to the small material flow rate of the material head and the large material flow rate of the subsequent material, and the valve opening of the steam valve remains unchanged, the moisture content of the material head increases significantly.

[0041] Based on this, an embodiment of the present invention discloses a method for controlling the moisture content at the outlet of a feeding machine. A steam flow control valve is provided at the outlet of the feeding machine, and the moisture content at the outlet of the feeding machine is controlled by adjusting the valve opening of the steam flow control valve; as Figure 2 shown, the control method includes:

[0042] Step 101: Obtain a first relationship according to the ideal curve of the moisture content at the outlet of the feeding machine and time;

[0043] Step 102: Respectively obtain test data under different feeding modes. The test data includes the moisture content at the outlet of each feeding machine corresponding to different valve openings at each set time point;

[0044] Step 103: Construct a second relationship between the moisture content at the outlet of the feeding machine, the valve opening, and time according to the test data;

[0045] Step 104: Obtain the valve opening corresponding to each time point according to the first relationship and the second relationship.

[0046] Specifically, a steam flow control valve capable of controlling the steam flow is provided at the outlet of the feeding machine. By adjusting the valve opening of the steam flow control valve, the steam flow added to the feeding machine is controlled, and thus the moisture content of the material at the outlet of the feeding machine is controlled.

[0047] Specifically, in step 101, an ideal curve representing the relationship between the moisture content at the outlet of the feeding machine and time can be drawn according to the different requirements of different brands of cut tobacco or different material flow rates for the moisture content, and the first relationship is obtained by fitting according to the ideal curve.

[0048] In this embodiment, the requirements for the ideal curve include:

[0049] ① The moisture content of the material at the outlet of the feeding machine quickly rises to a predetermined moisture within a preset time;

[0050] ② After the moisture content of the material at the outlet of the feeder rises to the predetermined moisture content, it will no longer rise and will maintain the current moisture value.

[0051] Since the flow rate of the material entering the feeder increases from small to large, in order to solve the problem of overshoot at the head of the material, therefore, at the head stage, according to the requirements of the ideal curve, within the preset time, the moisture content of the material is quickly raised to the predetermined moisture content. After the head ends, the current valve opening can be maintained, that is, the current moisture value is maintained.

[0052] After obtaining the ideal curve of the relationship between the moisture content at the outlet of the feeder and time, the ideal curve is fitted to obtain the first relational expression.

[0053] Further, in this embodiment, the first relational expression is the Michaelis-Menten equation. Using the Michaelis-Menten equation, the fitting degree with the ideal curve is relatively high and the fitting effect is good.

[0054] Further, in this embodiment, the Michaelis-Menten equation is:

[0055]

[0056] In the formula: t represents time, and Y represents the moisture content at the outlet of the feeder.

[0057] Specifically, in step 102, by controlling the valve opening of the steam flow control valve, the moisture content of the material at the outlet of the feeder at different time points and different valve openings is tested to obtain multiple groups of test data.

[0058] Specifically, in step 103, by statistically analyzing multiple groups of test data and constructing a regression equation, a second relational expression of the moisture content at the outlet of the feeder with respect to the valve opening and time is obtained.

[0059] Further, in this embodiment, the second relational expression is:

[0060] Y = 2.175 + 0.5058t - 0.1455x - 0.005681t 2 + 0.00439x 2 + 0.00038tx + 0.000017t 3 - 0.000018x 3 + 0.000013xt 2 - 0.000023tx 2

[0061] In the formula: t represents time, x represents the valve opening, and Y represents the moisture content at the outlet of the feeder.

[0062] Specifically, in step 104, by performing an elimination operation on the first relational expression and the second relational expression, the moisture content of the material at the outlet of the feeder corresponding to different valve openings of the steam flow control valve at each time point within the preset time is obtained. By adjusting the valve opening to regulate the steam flow, the stability of the moisture content of the material at the outlet of the feeder is further improved.

[0063] Furthermore, in order to be able to remotely control the steam flow control valve, optionally, the steam flow control valve is a diaphragm valve. Using this steam flow control valve has the characteristics of accurate valve opening adjustment, fast valve response speed, and high sensitivity.

[0064] The present invention also provides a control device for the moisture content at the outlet of the feeder. A steam flow control valve is provided at the outlet of the feeder, and the moisture content at the outlet of the feeder is controlled by adjusting the valve opening of the steam flow control valve; the control device includes:

[0065] A first relational expression construction module, configured to obtain a first relational expression according to the ideal curve of the moisture content at the outlet of the feeder and time;

[0066] A data acquisition module, configured to respectively acquire test data under different feeding modes, and the test data includes the moisture content at the outlet of each feeder corresponding to different valve openings at each set time point;

[0067] A second relational expression construction module, configured to construct a second relational expression of the moisture content at the outlet of the feeder, the valve opening, and time according to the test data;

[0068] A steam valve control module, configured to obtain the valve opening corresponding to each time point according to the first relational expression and the second relational expression.

[0069] Furthermore, the first relational expression is the Michaelis-Menten equation.

[0070] Furthermore, the Michaelis-Menten equation is:

[0071]

[0072] In the formula: t represents time, and Y represents the moisture content at the outlet of the feeder.

[0073] Furthermore, the second relational expression is:

[0074] Y = 2.175 + 0.5058t - 0.1455x - 0.005681t 2 + 0.00439x 2 + 0.00038tx + 0.000017t 3 - 0.000018x 3 + 0.000013xt 2 - 0.000023tx 2

[0075] In the formula: t represents time, x represents the valve opening, and Y represents the moisture content at the outlet of the feeder.

[0076] Furthermore, the steam flow control valve is a diaphragm valve.

[0077] The present invention provides a control method and a control device for the moisture content at the outlet of a feeder. A steam flow control valve is arranged at the outlet of the feeder, and the moisture content at the outlet of the feeder is controlled by controlling the valve opening of the steam flow control valve. The present invention obtains a first relational expression through an ideal curve of the relationship between the moisture content at the outlet of the feeder and time. In addition, by testing each group of test data under different modes and statistically analyzing the test data, a second relational expression between the moisture content at the outlet of the feeder, the valve opening, and time is obtained. Furthermore, the valve opening of the steam flow control valve corresponding to each time point is obtained through the first relational expression and the second relational expression, solving the problem of unstable moisture content of the material at the outlet of the feeder in the prior art, capable of improving the stability of the moisture of the material at the outlet of the feeder, and improving the qualified rate of cut tobacco.

[0078] The present invention is described below through specific examples.

[0079] Embodiment

[0080] Based on a certain brand of cut tobacco, an ideal curve is made, as Figure 3 shown. This ideal curve includes:

[0081] ① The moisture content of the material at the outlet of the feeder rapidly rises to 20% moisture within 2 minutes and 30 seconds;

[0082] ② After the moisture content of the material at the outlet of the feeder rises to 20% moisture, it no longer rises and maintains the current moisture value.

[0083] Through the drawn ideal curve, a data point is taken every 10 seconds (as shown in Table 1), and the data is fitted to obtain a fitting relational expression of the data.

[0084] Table 1 Ideal curve data points (estimated)

[0085]

[0086] After fitting the above data, a Michaelis equation with a high fitting degree, representing the relationship between the moisture content at the outlet of the feeder and time, is obtained:

[0087]

[0088] In the formula: t represents time, and Y represents the moisture content at the outlet of the feeder.

[0089] Next, by controlling the valve opening of the steam flow control valve, the moisture content at the outlet of the feeder is tested at each time point in different modes, and multiple groups of test data are obtained.

[0090] As shown in Table 2, the cut tobacco of the above brand is divided into four groups to test the valve opening and the moisture content at the outlet of the feeder:

[0091] ① Low start and low trend; ② Low start and high trend; ③ High start and low trend; ④ High start and high trend.

[0092] Table 2 Test group data

[0093]

[0094] By performing regression analysis on the above multiple groups of test data, for example, using a 3rd-order full interaction term for analysis, a regression equation is constructed:

[0095] Y = f(xt) = 2.175 + 0.5058t - 0.1455x - 0.005681t 2 + 0.00439x 2 + 0.00038tx + 0.000017t 3 - 0.000018x 3 + 0.000013xt 2 - 0.000023tx 2

[0096] In the formula: t represents time, x represents the valve opening, and Y represents the moisture content at the outlet of the feeder.

[0097] After obtaining the Michaelis equation and the regression equation, by eliminating (x) using the obtained Michaelis equation and regression equation, the moisture content at the outlet of the feeder corresponding to different valve openings at each time point is obtained.

[0098] During the production process, the valve opening of the steam flow control valve at the outlet of the feeder is controlled in two parts. One part is the head material part. Using the above control method, the valve opening at each time point is controlled, so that the moisture at the outlet of the feeder within the preset time can be determined to be within the control range, thereby improving the stability of the material moisture at the outlet of the feeder; the other part is after the head material ends, then the valve opening is the normal opening (for example, it can be set to 80% of the valve opening, and can be specifically set according to actual production needs) until the production of this batch of materials ends.

[0099] When using the above control method, it is necessary to judge whether the head material arrives. If it arrives, the above control method is run to control the valve opening until the head material ends. The judgment methods for the start and end of the head material, for example, can use an optoelectronic detection switch or an electronic scale flow rate in the prior art, and the present invention does not limit this.

[0100] Although the present invention has been illustrated and described with reference to certain preferred embodiments thereof, those of ordinary skill in the art should understand that the above content is a further detailed description of the present invention in connection with specific embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. Those skilled in the art can make various changes in form and detail, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A control method for the moisture content at the outlet of a feeding machine, characterized in that, A steam flow control valve is provided at the outlet of the feeder, and the moisture content at the outlet of the feeder is controlled by adjusting the valve opening of the steam flow control valve; the control method includes: According to the ideal curve of the moisture content at the outlet of the feeder and time, the ideal curve is fitted to obtain the first relationship between the moisture content at the outlet of the feeder and time; Test data under different feeding modes are respectively obtained, and the test data includes the moisture content at the outlet of the feeder corresponding to different valve openings at each set time point; According to the test data, a second relationship between the moisture content at the outlet of the feeder, the valve opening and time is constructed; According to the first relationship and the second relationship, the valve opening corresponding to each time point is obtained.

2. The control method for the moisture content at the outlet of the feeding machine according to claim 1, characterized in that, The first relationship is the Michaelis-Menten equation.

3. The control method for the moisture content at the outlet of the feeder as described in claim 2, wherein The Michaelis-Menten equation is: In the formula: t represents time, and Y represents the moisture content at the outlet of the feeder.

4. The method for controlling the moisture content at the outlet of the feeding machine according to claim 1, wherein, The second relationship is: Y = 2.175 + 0.5058t - 0.1455x - 0.005681t 2 +0.00439x 2 + 0.00038tx +0.000017t 3 -0.000018x 3 + 0.000013xt 2 - 0.000023tx 2 In the formula: t represents time, x represents the valve opening, and Y represents the moisture content at the outlet of the feeder.

5. The method for controlling the moisture content at the outlet of the feeding machine according to claim 1, wherein The steam flow control valve is a diaphragm valve.

6. A control device for the moisture content at the outlet of a feeder, characterized in that, A steam flow control valve is provided at the outlet of the feeder, and the moisture content at the outlet of the feeder is controlled by adjusting the valve opening of the steam flow control valve; the control device includes: A first relationship construction module, configured to fit the ideal curve according to the ideal curve of the moisture content at the outlet of the feeder and time, and obtain the first relationship between the moisture content at the outlet of the feeder and time; A data acquisition module, configured to respectively obtain test data under different feeding modes, where the test data includes the moisture content at the outlet of the feeder corresponding to different valve openings at each set time point; A second relationship construction module, configured to construct a second relationship between the moisture content at the outlet of the feeder, the valve opening and time according to the test data; A steam valve control module, configured to obtain the valve opening corresponding to each time point according to the first relationship and the second relationship.

7. The control device for the moisture content at the outlet of the feeding machine according to claim 6, characterized in that, The first relationship is the Michaelis-Menten equation.

8. The control device for the moisture content at the outlet of the feeder as described in claim 7, characterized in that, The Michaelis-Menten equation is: In the formula: t represents time, and Y represents the moisture content at the outlet of the feeder.

9. The control device for the moisture content at the outlet of the feeder as claimed in claim 6, wherein The second relationship is: Y = 2.175 + 0.5058t - 0.1455x - 0.005681t 2 +0.00439x 2 + 0.00038tx +0.000017t 3 -0.000018x 3 + 0.000013xt 2 - 0.000023tx 2 In the formula: t represents time, x represents the valve opening, and Y represents the moisture content at the outlet of the feeder.

10. The control device for the moisture content at the outlet of the feeding machine according to claim 6, characterized in that, The steam flow control valve is a diaphragm valve.

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