Feeding method, medium and equipment for heating cigarette production line

Abstract

The invention belongs to the technical field of heating cigarette production control, and particularly relates to a heating cigarette production line feeding method, medium and equipment. The feeding method comprises the following steps: establishing a binary nonlinear prediction equation of the glycerol feed liquid temperature by taking the feed liquid temperature as a dependent variable and the viscosity and the glycerol mass percent as independent variables; establishing a feeding working parameter table of glycerol feed liquid; determining a target temperature value of temperature control of the glycerol feed liquid, obtaining an actual temperature value at the position where the glycerol feed liquid is applied to the nozzle, and calculating an error between the actual temperature value and the target temperature value; and establishing a transfer function between the temperature error and the actual temperature at the nozzle, and constructing a glycerol feed liquid temperature online control system to be applied to a feeding process of a heating cigarette production line. The actual value of the feeding nozzle can be adjusted in real time according to the glycerol feed liquid temperature design value, the online glycerol application stability and accuracy are improved, and therefore production quality control over heated cigarette products is supported.

Description

Technical Field

[0001] The invention belongs to the technical field of heated cigarette production control, and in particular relates to a feeding method, medium and equipment for a heated cigarette production line. Background Art

[0002] With the rapid development of new tobacco, heated cigarettes have gradually become a hot spot in product research and development. Heated cigarettes heat the tobacco core material segment through a special heat source, and produce smoke for consumers to inhale in a non-combustion state. The release characteristics of the smoke determine the sensory quality of the product. At present, the tobacco core materials used to produce smoke are mostly two types: orderly filled thick pulp method reconstituted tobacco leaves and disorderly filled papermaking method reconstituted tobacco leaves. In recent years, in order to enrich the tobacco flavor characteristics of heated cigarette products, cigarette companies have begun to use natural tobacco leaf raw materials as heated cigarette core materials.

[0003] In heated cigarette products, glycerol is the main smoking agent with many characteristics, such as moisturizing, high activity, anti-oxidation and low-temperature smoking. Glycerol can carry tobacco flavor components at relatively low temperatures (below 300°C), which is crucial to the quality of heated cigarette products. However, due to the extremely high viscosity of glycerol, it is very difficult to apply it to natural tobacco leaf raw materials. At present, the method of applying glycerol in the feeding process of the heated cigarette production line mainly relies on experience. The viscosity is reduced by increasing the temperature (above 30°C), and then the glycerol liquid is applied to the tobacco in a certain proportion. However, in this process, there is a lack of stability control of the glycerol liquid temperature, and problems such as overheating of the glycerol liquid or excessive viscosity are prone to occur, resulting in large fluctuations in the particle size of the glycerol droplets, affecting the accuracy of application, and failing to meet the quality control requirements of heated cigarette production.

[0004] Therefore, it is necessary to establish a feeding method for the heated cigarette production line, which can adjust the actual value in real time according to the design value of the glycerol liquid temperature, thereby improving the stability of glycerol online application to support the production quality control of heated cigarette products. Summary of the invention

[0005] The object of the present invention is to provide a feeding method, medium and equipment for a heated cigarette production line, which can adjust the actual value in real time according to the viscosity design value of the glycerol liquid to solve the problems existing in the above-mentioned background technology.

[0006] To achieve the above objectives, this application is implemented through the following technical solutions:

[0007] A feeding method for a heated cigarette production line comprises the following steps:

[0008] S1. Taking the feed liquid temperature as the dependent variable and the feed liquid viscosity and the mass percentage of glycerol as the independent variables, a binary nonlinear prediction equation for the glycerol feed liquid temperature is established;

[0009] S2. According to the binary nonlinear prediction equation of step S1, a feeding working parameter table of glycerol liquid is established;

[0010] S3. According to the feeding working parameter table in step S2, the mass percentage of glycerol and the viscosity working point of the glycerol liquid are selected, the target temperature value of the temperature control of the glycerol liquid is determined, the actual temperature value of the glycerol liquid application nozzle is obtained, the error between the actual temperature value and the target temperature value is calculated, and the interference temperature value of the feeding system is determined;

[0011] S4. Establish a transfer function between the temperature error and the actual temperature at the nozzle, and construct an online control system for the propylene glycol liquid temperature to be applied to the feeding process of the heated cigarette production line.

[0012] Furthermore, in step S1, the binary nonlinear prediction equation of the glycerol liquid is a binary differential equation of its temperature with respect to viscosity and glycerol mass percentage:

[0013] ,

[0014] Where z is the predicted temperature of the glycerol liquid; k1-k 15 is the fitting parameter of the nonlinear prediction equation; x is the viscosity of the glycerol liquid; y is the mass percentage of glycerol in the liquid; m is 0 or 4, and n is 0 or 3.

[0015] Furthermore, in step S2, the feeding working parameter table of the glycerol liquid includes the viscosity of the glycerol liquid, the mass percentage of glycerol and the temperature.

[0016] Furthermore, the viscosity working range of the glycerol liquid is 0.3 cP to 624 cP, the mass percentage working range of glycerol is 0% to 100%, and the temperature control range of the liquid is 30°C to 100°C.

[0017] Furthermore, in step S3, the interference temperature of the feeding system is calculated based on the temperature difference between the propylene glycol slurry at the slurry temperature controller and the feeding nozzle: e=z1-z0, wherein e is the interference temperature of the feeding system; z1 is the slurry temperature at the temperature controller; and z0 is the slurry temperature at the nozzle.

[0018] Further, in step S4, the input of the online control system is the error E between the target temperature value and the actual value of the glycerol liquid temperature control. z(S) , the system output is the actual value of the glycerol liquid temperature Z (S) , and obtain the transfer function G between the propylene glycol liquid temperature error and the actual value (S) : , where S is the complex frequency of the transfer function.

[0019] Further, in step S4, the online control system includes a PID controller. An online control system for the glycerol feed liquid temperature is established using the transfer function G(S). Preferably, a PID controller is introduced into the system, and appropriate proportional and integral gains are selected to further improve the control performance of the system:

[0020] Among them, Z0(S) is the target value of propylene glycol feed liquid temperature control; Ez(S) is the error between the target value and the actual value of propylene glycol feed liquid temperature control; G(S) is the transfer function between the propylene glycol feed liquid temperature error and the actual value; Z(S) is the actual value of propylene glycol feed liquid temperature.

[0021] A medium having a program stored thereon, wherein the program executes any one of the above-mentioned methods for feeding a heated cigarette production line on a processor.

[0022] A device comprises a processor and a memory, wherein the memory is used to store programs, and the processor executes the programs stored in the memory, so that the device executes any one of the above-mentioned methods for feeding heated cigarette production lines.

[0023] The beneficial effects of the present invention are:

[0024] 1) Compared with the current feeding method of the heated cigarette production line, the present invention can adjust the actual value at the feeding nozzle in real time according to the design value of the glycerol liquid temperature, improve the stability of glycerol online application, and thus support the production quality control of heated cigarette products.

[0025] 2) The traditional method of applying propylene glycol liquid depends on experience, while the present invention provides a precise feeding method based on a nonlinear temperature prediction equation and a parameter table, which improves the accuracy and stability of application.

[0026] 3) The present invention is equipped with a medium storing a specific computer program, which can execute a new method of feeding a heated cigarette production line on a processor, so that the production equipment can more efficiently control the temperature of the propylene glycol liquid, improve product quality and meet production needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The present invention is a flow chart of the method.

[0028] Figure 2 It is a surface graph of the viscosity of the feed liquid between 0.3cP and 34.9cP, the mass percentage of propylene glycol in the range of 0% to 80%, and the corresponding propylene glycol feed liquid temperature. Note: The blue dots are the predicted values ​​of the propylene glycol feed liquid temperature.

[0029] Figure 3The actual value control curve of the online feeding control system when the temperature target value is 40℃ is shown when the viscosity of the feed liquid is 9.4cP, the mass percentage of glycerol is 70%, and the system interference temperature is 0.6℃.

[0030] Figure 4 It is a surface graph of the viscosity of the feed liquid between 3.2cP and 624cP, the mass percentage of propylene glycol in the range of 80% to 100%, and the corresponding propylene glycol feed liquid temperature. Note: The blue dots are the predicted values ​​of the propylene glycol feed liquid temperature.

[0031] Figure 5 The actual value control curve of the online feeding control system when the temperature target value is 60℃ is shown when the viscosity of the feed liquid is 14.2cP, the mass percentage of glycerol is 85%, and the system interference temperature is 1.1℃. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is described in detail below in conjunction with embodiments. The following embodiments are merely exemplary and can only be used to explain and illustrate the technical solution of the present invention, but cannot be construed as limiting the technical solution of the present invention.

[0033] Example 1

[0034] A method, medium and equipment for feeding a heated cigarette production line, such as Figure 1 As shown, the method comprises the following steps:

[0035] Step 1) Taking the feed liquid temperature as the dependent variable and the feed liquid viscosity and the mass percentage of glycerol as the independent variables, a binary nonlinear prediction equation for the glycerol feed liquid temperature is established, such as Figure 2 When the viscosity of the feed liquid is in the range of 0.3cP to 34.9cP and the mass percentage of glycerol (y) is in the range of 0% to 80%, the temperature of the glycerol feed liquid conforms to the following equation: ,

[0036] Wherein, x is the viscosity of the glycerol liquid; y is the mass percentage of glycerol in the liquid; and z is the predicted temperature value of the glycerol liquid.

[0037] Step 2) According to the nonlinear prediction equation of glycerol liquid temperature, a working parameter table of glycerol liquid is established, as shown in Table 1. According to Table 1, the correlation coefficient between the predicted result and the actual result is 0.999304.

[0038] Table 1 Measured and predicted values ​​of liquid temperature when the viscosity of the liquid is between 0.3 cP and 34.9 cP and the mass percentage of propylene glycol is between 0 and 80%.

[0039] Table 1

[0040]

[0041] Table 1

[0042]

[0043] Table 1

[0044]

[0045] Table 1

[0046]

[0047] Step 3) Selecting the working point of the glycerol liquid during the production of heated cigarette filling: viscosity of 9.4 cP, glycerol mass percentage of 70%, temperature of 40°C.

[0048] Step 4) Use the transfer function G (S) An online control system for the propylene glycol liquid temperature was established. The system interference temperature was -0.6°C, and the PID control coefficients were selected as 9, 0, and 0.

[0049]

[0050] When the viscosity of the feed liquid is 9.4 cP, the mass percentage of glycerol is 70%, and the temperature control target value is 40°C, the actual temperature control curve of the online feeding control system is as follows: Figure 3 . The temperature online control system is applied in the production process of heated cigarettes. The actual temperature of the glycerol liquid at the nozzle can reach the control target value within 5 seconds, realizing the continuous control of the temperature of the glycerol liquid at the nozzle. The system has no overshoot and solves the problem of slow cooling of the glycerol liquid in the insulation tank on the production line.

[0051] Example 2

[0052] A method, medium and equipment for feeding a heated cigarette production line, such as Figure 1 As shown, the method comprises the following steps:

[0053] Step 1) Taking temperature as the dependent variable and viscosity and mass percentage as independent variables, a binary nonlinear prediction equation for glycerol liquid is established, such as Figure 4 When the viscosity of the feed liquid is in the range of 3.2cP to 624cP, and the mass percentage of glycerol (y) is in the range of 80% to 100%, the temperature of the glycerol feed liquid conforms to the following equation:

[0054] ,

[0055] Wherein, x is the viscosity of the glycerol liquid; y is the mass percentage of glycerol in the liquid; and z is the predicted temperature value of the glycerol liquid.

[0056] Step 2) According to the nonlinear prediction equation of glycerol liquid temperature, a working parameter table of glycerol liquid is established, as shown in Table 2. According to Table 2, the correlation coefficient between the predicted result and the actual result is 0.999875.

[0057] Table 2 Measured and predicted values ​​of glycerol liquid temperature when viscosity is between 3.2 cP and 624 cP and glycerol mass percentage is between 80% and 100%.

[0058] Table 2

[0059]

[0060] Step 3) Selecting the working point of the glycerol liquid during the production of heated cigarettes: viscosity of 14.2 cP, glycerol mass percentage of 85%, and temperature of 60°C.

[0061] Step 4) Use the transfer function G (S) An online control system for the propylene glycol liquid temperature was established. The system interference temperature was -1.1°C, and the PID control coefficients were selected as 15, 0.3, and 0.

[0062]

[0063] When the viscosity of the feed liquid is 14.2 cP, the mass percentage of glycerol is 85%, and the temperature control target value is 60°C, the actual temperature value curve of the online control system for feeding is as follows: Figure 5 . The temperature online control system is applied in the production process of heated cigarettes. The actual temperature of the glycerol liquid at the nozzle can reach the control target value within 5 seconds, realizing the continuous control of the temperature of the glycerol liquid at the nozzle. The system has no overshoot and solves the problem of slow cooling of the glycerol liquid in the insulation tank on the production line.

[0064] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A feeding method for a heated cigarette production line, characterized in that: The following steps are involved: S1. Taking the feed liquid temperature as the dependent variable and the feed liquid viscosity and the mass percentage of glycerol as the independent variables, a binary nonlinear prediction equation for the glycerol feed liquid temperature is established; S2. According to the binary nonlinear prediction equation of step S1, a feeding working parameter table of glycerol liquid is established; S3. According to the feeding working parameter table in step S2, the mass percentage of glycerol and the viscosity working point of the glycerol liquid are selected, the target temperature value of the temperature control of the glycerol liquid is determined, the actual temperature value of the glycerol liquid application nozzle is obtained, the error between the actual temperature value and the target temperature value is calculated, and the interference temperature value of the feeding system is determined; S4. Establish a transfer function between the temperature error and the actual temperature at the nozzle, and construct an online control system for the propylene glycol liquid temperature to be applied to the feeding process of the heated cigarette production line.

2. The feeding method for a heated cigarette production line according to claim 1, characterized in that: In step S1, the binary nonlinear prediction equation of the glycerol liquid is a binary differential equation of its temperature with respect to viscosity and glycerol mass percentage: , Where z is the predicted temperature of the glycerol liquid; k1-k 15 is the fitting parameter of the nonlinear prediction equation; x is the viscosity of the glycerol liquid; y is the mass percentage of glycerol in the liquid; m is 0 or 4, and n is 0 or 3.

3. The feeding method for a heated cigarette production line according to claim 1, characterized in that: In step S2, the feeding working parameter table of the glycerol liquid includes the viscosity of the glycerol liquid, the mass percentage of glycerol and the temperature.

4. The feeding method for a heated cigarette production line according to claim 3, characterized in that: The viscosity working range of the glycerol liquid is 0.3 cP to 624 cP, the mass percentage working range of glycerol is 0% to 100%, and the temperature control range of the liquid is 30°C to 100°C.

5. The feeding method for a heated cigarette production line according to claim 1, characterized in that: In step S3, the interference temperature of the feeding system is calculated according to the temperature difference between the propylene glycol slurry at the slurry temperature controller and the feeding nozzle: e=z1-z0, wherein e is the interference temperature of the feeding system; z1 is the slurry temperature at the temperature controller; and z0 is the slurry temperature at the nozzle.

6. The feeding method for a heated cigarette production line according to claim 1, characterized in that: In step S4, the input of the online control system is the error E between the target temperature value and the actual value of the glycerol liquid temperature control. z(S) , the system output is the actual value of the glycerol liquid temperature Z (S) , and obtain the transfer function G between the propylene glycol liquid temperature error and the actual value (S) : , where S is the complex frequency of the transfer function.

7. The feeding method for a heated cigarette production line according to claim 6, characterized in that: In step S4, the online control system includes a PID controller.

8. A medium having a program stored thereon, characterized in that: The program executes the method for charging a heated cigarette production line according to any one of claims 1 to 6 on a processor.

9. A device comprising a processor and a memory, wherein the memory is used to store a program, and the processor executes the program stored in the memory, characterized in that: The device is configured to implement the method for charging a heated cigarette production line according to any one of claims 1 to 6.

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