Method and system for regulating and controlling sliver rejecting proportion of cigarette making machine

Abstract

The invention belongs to the technical field of cigarette production, and particularly relates to a method and system for regulating and controlling the sliver rejecting proportion of a cigarette making machine. The method comprises the following steps: determining a sliver rejecting proportion adjusting quantity according to an absolute value of a difference value between a target sliver rejecting proportion and a measured actual sliver rejecting proportion; selecting a regulation and control mode according to the sliver ratio elimination regulation quantity, and selecting the height of the regulation baffle when the sliver ratio elimination regulation quantity is greater than a first threshold value; when the stem rejecting proportion adjusting quantity is larger than or equal to the second threshold value and smaller than or equal to the first threshold value, the pressure of the small fan is selected to be adjusted; when the sliver rejecting proportion adjusting quantity is smaller than a second threshold value, the crosswind opening degree of the wind separation device is selected to be adjusted; and the first threshold value is greater than the second threshold value, so that the target sliver rejection ratio can be accurately and quickly adjusted, and the accuracy and efficiency of regulation and control of the sliver rejection ratio in the rolling process are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of cigarette production, and in particular relates to a method and system for controlling the stem rejection ratio of a cigarette making machine. Background Art

[0002] Stem sticks refer to the petiole and stem of tobacco leaves. They are hard strips of material that remain in tobacco shreds after the leaves are picked, threshed, re-roasted and processed into shreds. The presence of stem sticks will not only cause uneven burning of cigarettes, but also have a negative impact on the sensory quality evaluation of cigarettes. At the same time, during the production of cigarettes, stem sticks can easily pierce the cigarette paper, which not only affects the appearance of cigarettes, but also causes air leakage during the smoking process. Therefore, the content of stem sticks in tobacco shreds will be reduced as much as possible during the shred and packaging process. In the shred process, a wind selection process is set up after the leaf drying process, and the tobacco shreds and stem sticks are separated by using the principle that the tobacco shreds and stem sticks have different suspension speeds in the wind. However, the wind selection process usually only removes large stem sticks that are quite different from the tobacco shreds, and the removal effect of small stem sticks is not good. Therefore, during the packaging process, an air separation device will be set up at the cigarette machine to further remove the stem sticks in the tobacco shreds. After the conveyor belt throws the tobacco into the wind chamber of the wind separation device, the small fan in the wind chamber provides negative pressure, and combines with the baffle and side wind inlet to separate the stems and remove the stems contained in the tobacco.

[0003] At present, with the continuous development of cigarettes, the specifications of cigarettes are constantly changing. Cigarettes of different specifications and brands have different requirements for stem removal due to the different circumferences of cigarettes and the different incoming material formula structures. In particular, the size of slim cigarettes is smaller, and the requirements for the stem content in tobacco are more stringent. This requires the rapid and accurate adjustment of the stem content in the incoming tobacco. At present, operators adjust the pressure of small fans, the height of baffles or the opening of side winds according to the adjustment amount based on experience. When operators choose the adjustment method based on experience and feel, the change range of stem flow may be too large or too small, and the balance point of suspension separation of tobacco and stems cannot be quickly found, resulting in low stem removal ratio and poor removal effect. And it is necessary to repeatedly adjust back and forth, which reduces the removal efficiency, and invisibly increases the workload of operators, and causes unnecessary losses to equipment. Summary of the invention

[0004] The object of the present invention is to provide a method and system for controlling the stem rejection ratio of a cigarette making machine, so as to solve the problem of low rejection accuracy of the stem rejection ratio of cigarettes in the prior art.

[0005] In order to solve the above technical problems, the present invention provides a method for controlling the stem rejection ratio of a cigarette making machine, comprising: Determine the stem rejection ratio adjustment amount according to the absolute value of the difference between the target stem rejection ratio and the measured actual stem rejection ratio; Select the control method according to the size of the stem stick rejection ratio adjustment amount. When the stem stick rejection ratio adjustment amount is greater than the first threshold, choose to adjust the baffle height; when the stem stick rejection ratio adjustment amount is greater than or equal to the second threshold and less than or equal to the first threshold, choose to adjust the small fan pressure; when the stem stick rejection ratio adjustment amount is less than the second threshold, choose to adjust the side wind opening of the air separation device; the first threshold is greater than the second threshold.

[0006] Furthermore, after selecting the control method according to the size of the control amount by eliminating the stem signature ratio, the regression model corresponding to each control method is used to determine the control amount of each control method, including the baffle height adjustment amount, the small fan pressure adjustment amount and the side wind opening adjustment amount, and each control device is regulated according to the adjustment amount of each control method.

[0007] Furthermore, the method for determining the corresponding regression model when adjusting the baffle height is as follows: control the small fan pressure and side wind opening of the cigarette making machine to remain unchanged, quantitatively adjust the baffle height, measure the corresponding cigarette machine stem rejection ratio under different baffle heights, and finally fit the regression model of stem rejection ratio and baffle height.

[0008] Furthermore, the method for determining the corresponding regression model when adjusting the small fan pressure is as follows: control the cigarette machine baffle height and side wind opening to remain unchanged, quantitatively adjust the small fan pressure, measure the corresponding cigarette machine stem rejection ratio under different small fan pressures, and finally fit the regression model of stem rejection ratio and small fan pressure.

[0009] Furthermore, the method for determining the corresponding regression model when adjusting the side wind opening of the air distribution device is: control the cigarette machine baffle height and the small fan pressure to remain unchanged, quantitatively adjust the side wind opening, measure the corresponding cigarette machine stem rejection ratio under different side wind openings, and finally fit the regression model of stem rejection ratio and side wind opening.

[0010] Furthermore, when the regulation is performed according to the size of the stem signature rejection ratio adjustment amount, the regulation is terminated when the stem signature rejection ratio adjustment amount is less than a third threshold value; and the third threshold value is less than the second threshold value.

[0011] Furthermore, the side wind opening is adjusted by adjusting the opening of the upper air inlet and / or the lower air inlet.

[0012] Furthermore, the upper air inlet is arranged parallel to the side wall of the wind chamber of the air distribution device, and the upper air inlet includes at least two rows of air inlet holes and a ventilation baffle covering the surface of the air inlet holes. The ventilation rows of the air inlet holes are adjusted by moving the ventilation baffle to adjust the opening of the upper air inlet.

[0013] Furthermore, the lower air inlet is arranged obliquely to the side wall of the air chamber of the air separation device; the lower air inlet is provided with an air inlet baffle for adjusting the width of the opening, and the opening degree of the lower air inlet is adjusted by adjusting the opening width of the air inlet baffle.

[0014] The beneficial effects of the above technical scheme are as follows: the present invention is an improved invention creation, by analyzing the influence of the adjustment range of the three adjustment methods of adjusting the baffle height, the small fan pressure and the side wind opening on the stem rejection ratio, and combining the adjustment difficulty of the three adjustment methods for comprehensive consideration, a technical scheme of selecting the adjustment method for precise control according to the size of the adjustment amount of the stem rejection ratio is obtained. Since the adjustment ranges of the three adjustment methods of adjusting the baffle height, the small fan pressure and the side wind opening are different, and the operation difficulty of the three adjustment methods is also different, the baffle height is the most difficult to adjust, and the side wind opening is the easiest It is easy to adjust. Therefore, different adjustment methods are selected according to the size of the stem stick rejection adjustment amount. The target stem stick rejection ratio can be adjusted accurately and quickly, which improves the accuracy and efficiency of the stem stick rejection ratio control in the rolling process. It avoids the selection of adjustment methods based on experience and feel, resulting in excessive or small changes in the stem stick flow rate, and difficulty in finding the balance point of suspended separation of tobacco and stem sticks. The uncertainty and instability of adjustment caused by repeated back and forth adjustments are required. The stem stick rejection ratio is quickly and stably within the target range, which helps to improve the stability of the cigarette rolling process and product quality.

[0015] In order to solve the above technical problems, the present invention also provides a cigarette machine stem rejection ratio control system, including a processor, the processor is connected to an actual stem rejection ratio measuring device, and the processor is used to execute the above-mentioned cigarette machine stem rejection ratio control method.

[0016] The beneficial effects of the above technical scheme are as follows: the present invention is an improved invention creation, by analyzing the influence of the adjustment range of the three adjustment methods of adjusting the baffle height, the small fan pressure and the side wind opening on the stem rejection ratio, and combining the adjustment difficulty of the three adjustment methods for comprehensive consideration, a technical scheme of selecting the adjustment method for precise control according to the size of the adjustment amount of the stem rejection ratio is obtained. Since the adjustment ranges of the three adjustment methods of adjusting the baffle height, the small fan pressure and the side wind opening are different, and the operation difficulty of the three adjustment methods is also different, the baffle height is the most difficult to adjust, and the side wind opening is the easiest It is easy to adjust. Therefore, different adjustment methods are selected according to the size of the stem stick rejection adjustment amount. The target stem stick rejection ratio can be adjusted accurately and quickly, which improves the accuracy and efficiency of the stem stick rejection ratio control in the rolling process. It avoids the adjustment method based on experience and feel, which leads to excessive or small changes in the stem stick flow rate, and it is difficult to find the balance point of suspended separation of tobacco and stem sticks. The adjustment uncertainty and instability caused by repeated back and forth adjustments are required. The stem stick rejection ratio is quickly and stably within the target range, which helps to improve the stability of the cigarette rolling process and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a flowchart of stem label removal according to an embodiment of the method of the present invention; Figure 2 is a flow chart of controlling the stem rejection ratio of a cigarette making machine according to an embodiment of the method of the present invention; Figure 3 It is a schematic diagram of the overall structure of the air distribution device of the cigarette making machine in the overall position of the cigarette making machine according to the embodiment of the method of the present invention; Figure 4 is a schematic diagram of the upper air inlet structure of an embodiment of the method of the present invention; Figure 5 is a scatter plot of stem rejection rate and crosswind opening degree of an embodiment of the method of the present invention; Figure 6 is a scatter plot of stem rejection rate and small fan pressure in an embodiment of the method of the present invention; Figure 7 is a scatter plot of stem rejection rate and baffle height in an embodiment of the method of the present invention; Figure numerals: 1-baffle; 2-small fan pressure gauge; 3-upper air inlet; 4-lower air inlet; 5-air inlet hole; 6-ventilation baffle. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clear, the specific implementation methods of the present invention are further described below in conjunction with the accompanying drawings.

[0019] The present invention quantitatively analyzes the influence of the adjustment amplitudes of the three adjustment modes of adjusting the baffle height, the small fan pressure and the side wind opening on the stem stick rejection ratio, and comprehensively considers the adjustment difficulty of the three adjustment modes, and obtains a technical solution for precise control by selecting the adjustment mode according to the size of the stem stick rejection ratio adjustment amount. Since the adjustment amplitudes of the three adjustment modes of adjusting the baffle height, the small fan pressure and the side wind opening are different, and the operation difficulty of the three adjustment modes is also different, the baffle height is the most difficult to adjust, and the side wind opening is the easiest to adjust, therefore, different adjustment modes are selected according to the size of the stem stick rejection adjustment amount, so that the target stem stick rejection ratio can be accurately and quickly adjusted, thereby improving the accuracy and efficiency of the stem stick rejection ratio control in the rolling process, avoiding the adjustment mode relying on experience and hand feeling resulting in excessive or small change amplitude of the stem stick flow rate, difficulty in finding the balance point of suspension separation of tobacco shreds and stem sticks, and the need for repeated back and forth adjustment to bring about adjustment uncertainty and instability, so that the stem stick rejection ratio is quickly and stably within the target range, which helps to improve the stability of the cigarette rolling process and product quality.

[0020] Method Embodiment The process of removing stems from the air separation device of the cigarette making machine during the packing process is as follows Figure 1As shown, after the needle-rolled tobacco falls evenly onto the conveyor belt, the conveyor belt throws the tobacco into the wind chamber of the air separation device. The small fan (air separation device) in the wind chamber controls the blowing air pressure, and completes the primary separation of stems and tobacco in combination with the baffle with a set height in the wind chamber. The wind chamber is then replenished with fresh air through the side air port (secondary separation device) to separate the stems. Therefore, the stem rejection ratio of the cigarette making machine can be controlled by adjusting the baffle height, the small fan pressure, and the side wind opening. Based on the above-mentioned adjustment principle, the present invention provides a method for controlling the stem rejection ratio of a cigarette making machine, such as Figure 2 As shown, the following steps are included: 1. Determine the target stem rejection ratio based on the rolling quality.

[0021] 2. Collect samples from the stem rejection port of the air separation device and determine the stem rejection ratio.

[0022] 3. Control relevant variables and establish regression models of stem rejection ratio, baffle height, small fan pressure and side wind opening.

[0023] The height of the cigarette making machine baffle and the pressure of the small fan are controlled to remain unchanged, and the side wind opening is adjusted. The side wind opening refers to the opening of the side air outlet of the air separation device. In order to achieve more precise control, the present embodiment provides two side air outlets with different wind directions and positions, including an upper air inlet and a lower air inlet. The upper air inlet is arranged parallel to the side wall of the air chamber of the air separation device, and the lower air inlet is arranged obliquely to the side wall of the air chamber of the air separation device. The side wind opening is adjusted by adjusting the opening of the upper air inlet and / or the lower air inlet. The side wall of the air chamber is parallel to the direction of the material, and the side wind enters perpendicularly to the direction of the material. In other embodiments, one air inlet or multiple air inlets with the same wind direction can be provided according to actual use requirements. The present invention does not limit the specific structure and position of the air inlet. As an implementation method, the lower air inlet is provided with an air inlet baffle for adjusting the width of the opening, and the opening of the lower air inlet is adjusted by adjusting the opening width of the air inlet baffle; the upper air inlet includes at least two rows of air inlet holes and a ventilation baffle covering the surface of the air inlet holes, and the opening of the upper air inlet is adjusted by adjusting the number of ventilation rows of the air inlet holes. Figure 3 As shown, the air distribution device of the cigarette making machine is provided with a baffle 1, a small fan pressure gauge 2, an upper air inlet 3 and a lower air inlet 4. The upper air inlet structure is as shown in FIG. Figure 4 As shown, it includes 5 rows of air inlet holes and an acrylic ventilation baffle. The number of rows of air inlet holes is adjusted by moving the acrylic ventilation baffle to adjust the opening of the upper air inlet. The two adjustment methods of the upper and lower air inlet openings are combined, that is, the number of rows of upper air inlet holes is adjusted by 1-5 in each state of the width and narrowness of the lower air inlet baffle opening. The incoming tobacco and the running tobacco after the stems are removed are collected each time, and the stem content in the tobacco is detected to obtain the corresponding stem removal ratio of the cigarette machine under different adjustment states of the side wind opening, as shown in FIG. Figure 5Finally, the regression model of the stem rejection ratio and the side wind opening of the air separation device is obtained by fitting. The regression model obtained in this embodiment is: P=0.952+0.560x+2.858x 2 Among them, P is the stem rejection ratio, and x is the side wind opening.

[0024] The height of the cigarette machine baffle and the side wind opening are controlled to remain unchanged, and the small fan pressure is adjusted. The small fan pressure is actually the pressure of the small fan in the cigarette machine, which can be adjusted by the motor frequency. By quantitatively adjusting the small fan pressure, the incoming tobacco and the tobacco strips after the stems are removed are collected each time, and the stem content in the tobacco is detected to obtain the rejection ratio of the cigarette machine under different adjustment states of the small fan pressure, such as Figure 6 As shown. Finally, the regression model of stem rejection ratio and small fan pressure was obtained by fitting: P=188.3-462.9y+285.8y 2 Wherein, y is the small fan pressure, in KPa.

[0025] The pressure of the small fan and the side wind opening of the cigarette machine are controlled to remain unchanged, and the height of the baffle is adjusted. By quantitatively adjusting the height of the baffle, the incoming tobacco and the tobacco strips after the stems are removed are collected each time, and the stem content in the tobacco is detected to obtain the rejection ratio of the cigarette machine under different adjustment states of the baffle height, such as Figure 7 Finally, the regression model of stem rejection ratio and baffle height was obtained by fitting: P=1482-43.37z+0.3175z 2 Where z is the height of the baffle in millimeters.

[0026] In actual use, the specific values ​​in the regression model obtained by testing different cigarette making machines may be different, and the present invention does not limit the specific values ​​in the regression model.

[0027] 4. Determine the stem rejection ratio adjustment amount based on the absolute value of the difference between the target stem rejection ratio and the actual stem rejection ratio measured, and select the control method based on the size of the stem rejection ratio adjustment amount.

[0028] From the above 3, it can be known that the three adjustment methods of baffle height, small fan pressure and side wind opening have different degrees of influence on the stem removal effect of the cigarette making machine. Since the three adjustment methods have different degrees of difficulty in operation, the side wind opening is the most convenient to adjust, and it is only necessary to adjust the inclination of the lower baffle (opening size) and the number of holes in the upper baffle; the small fan pressure is second, and the motor frequency needs to be adjusted to adjust the small fan pressure; the baffle height is the most difficult to operate, and when adjusting, the cigarette making machine needs to be shut down and the machine cover opened for adjustment. Therefore, the present invention comprehensively considers the quantitative analysis results of the impact of each adjustment method on the tobacco stem content in the cigarette making machine and the difficulty of adjustment of the three adjustment methods, and obtains an adjustment control scheme for different stem removal requirements, so as to achieve rapid and accurate adjustment of the tobacco stem content in the cigarette making machine. Specifically, when the stem tag rejection ratio adjustment amount is greater than the first threshold, the height of the baffle is adjusted; when the stem tag rejection ratio adjustment amount is greater than or equal to the second threshold and less than or equal to the first threshold, the pressure of the small fan is adjusted; when the stem tag rejection ratio adjustment amount is less than the second threshold, the side wind opening of the air separation device is adjusted; the first threshold is greater than the second threshold. In order to improve the control efficiency and reduce equipment loss, as an implementation method, when the stem tag rejection ratio adjustment amount is less than the third threshold, the stem tag rejection ratio is not controlled; in the process of controlling the stem tag rejection ratio adjustment amount according to the size of the stem tag rejection ratio, the control is terminated when the stem tag rejection ratio adjustment amount is less than the third threshold; the second threshold is greater than the third threshold. The first threshold, the second threshold and the third threshold can be set according to the control capacity and control requirements of each control device of the air separation device, and there is no limitation here. In a specific embodiment, the first threshold is set to 40%, the second threshold is set to 20%, and the third threshold is set to 5%. When it is greater than 40%, the height of the baffle is adjusted, when it is between 20% and 40%, the pressure of the small fan is adjusted, and when it is between 5% and 20%, the side wind opening is adjusted.

[0029] In another embodiment, when a small amount of stems are removed from the incoming tobacco, the target stem removal ratio can be met by adjusting the side wind opening; if an appropriate amount of stems need to be removed from the incoming tobacco, and the side wind opening adjustment cannot meet the adjustment requirement, that is, when the stem removal amount still does not meet the target stem removal ratio after the side wind opening adjustment reaches the limit value, the small fan pressure is adjusted; if a large amount of stems are required to be removed from the incoming tobacco, and the side wind opening and the small fan pressure cannot meet the adjustment requirement, that is, when the stem removal amount still does not meet the target stem removal ratio after the side wind opening and the small fan pressure adjustment reach the limit value, the baffle height is adjusted.

[0030] 5. After selecting the control method based on the size of the adjustment amount after eliminating the stem signature ratio, use the regression model corresponding to each control method to determine the adjustment amount of each control method, including the baffle height adjustment amount, small fan pressure adjustment amount and side wind opening adjustment amount, and control each control device according to the adjustment amount of each control method.

[0031] System Example The present invention provides a cigarette machine stem rejection ratio control system, including a processor, the processor is connected to an actual stem rejection ratio measuring device, and is used to implement a cigarette machine stem rejection ratio control method. The specific implementation process of the method has been described in detail in the method embodiment and will not be repeated here.

Claims

1. A method for controlling the ratio of stem removal in a cigarette making machine, It is characterized in that include: Determine the stem rejection ratio adjustment amount according to the absolute value of the difference between the target stem rejection ratio and the measured actual stem rejection ratio; Selecting a control mode according to the magnitude of the stem rejection ratio adjustment amount, and when the stem rejection ratio adjustment amount is greater than a first threshold, selecting to adjust the baffle height; When the stem rejection ratio adjustment amount is greater than or equal to the second threshold and less than or equal to the first threshold, choose to adjust the small fan pressure; when the stem rejection ratio adjustment amount is less than the second threshold, choose to adjust the side wind opening of the air separation device; the first threshold is greater than the second threshold.

2. The method for controlling the stem removal ratio of a cigarette making machine according to claim 1, It is characterized in that After selecting the control method according to the size of the adjustment amount by eliminating the stem signature ratio, the adjustment amount of each control method is determined using the regression model corresponding to each control method, including the baffle height adjustment amount, small fan pressure adjustment amount and side wind opening adjustment amount. Each control device is regulated according to the adjustment amount of each control method.

3. The method for controlling the ratio of stem removal of a cigarette making machine according to claim 2, It is characterized in that The method for determining the corresponding regression model when adjusting the baffle height is as follows: control the small fan pressure and side wind opening of the cigarette making machine to remain unchanged, quantitatively adjust the baffle height, measure the corresponding stem rejection ratio of the cigarette making machine under different baffle heights, and finally fit the regression model of stem rejection ratio and baffle height.

4. The method for controlling the stem removal ratio of a cigarette making machine according to claim 2, It is characterized in that The method for determining the corresponding regression model when adjusting the small fan pressure is as follows: control the cigarette machine baffle height and side wind opening unchanged, quantitatively adjust the small fan pressure, measure the corresponding cigarette machine stem rejection ratio under different small fan pressures, and finally fit the regression model of stem rejection ratio and small fan pressure.

5. The method for controlling the stem removal ratio of a cigarette making machine according to claim 2, It is characterized in that The method for determining the corresponding regression model when adjusting the side wind opening of the air distribution device is as follows: control the cigarette machine baffle height and small fan pressure unchanged, quantitatively adjust the side wind opening, measure the corresponding cigarette machine stem rejection ratio under different side wind openings, and finally fit the regression model of stem rejection ratio and side wind opening.

6. The method for controlling the stem removal ratio of a cigarette making machine according to claim 1, It is characterized in that When the regulation is performed according to the size of the stem rejection ratio adjustment amount, the regulation is terminated when the stem rejection ratio adjustment amount is less than a third threshold value; and the third threshold value is less than the second threshold value.

7. The method for controlling the stem removal ratio of a cigarette making machine according to claim 1, It is characterized in that The side wind opening is adjusted by adjusting the opening of the upper air inlet and / or the lower air inlet.

8. The method for controlling the stem removal ratio of a cigarette making machine according to claim 7, It is characterized in that The upper air inlet is arranged parallel to the side wall of the air chamber of the air distribution device. The upper air inlet includes at least two rows of air inlet holes and a ventilation baffle covering the surface of the air inlet holes. The ventilation rows of the air inlet holes are adjusted by moving the ventilation baffle to adjust the opening of the upper air inlet.

9. The method for controlling the stem removal ratio of a cigarette making machine according to claim 7, It is characterized in that The lower air inlet is arranged obliquely to the side wall of the air chamber of the air distribution device; the lower air inlet is provided with an air inlet baffle for adjusting the width of the opening, and the opening degree of the lower air inlet is adjusted by adjusting the opening width of the air inlet baffle.

10. A cigarette making machine stem rejection ratio control system, comprising a processor, the processor is connected to an actual stem rejection ratio measuring device, It is characterized in that The processor is used to implement the method for controlling the stem rejection ratio of a cigarette making machine as described in any one of claims 1 to 7.

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