Stem rejection control method and system in rolling process

Abstract

The invention belongs to the technical field of cigarette production, and particularly relates to a sliver rejection control method and system in the rolling process. The method comprises the following steps: determining a sliver rejection adjusting amount according to an absolute value of a difference value between a target sliver rejection amount and a measured actual sliver rejection amount; the negative pressure of the fan or the opening degree of an air inlet of the air separation device is adjusted according to the stem removing adjusting amount, and when the stem removing adjusting amount is large, the negative pressure of the fan is adjusted; when the sliver rejecting adjusting amount is small, the opening degree of the air inlet of the air separation device is selected to be adjusted, the adjusting modes of different adjusting amplitudes are selected according to the sliver rejecting adjusting amount for accurate control, the target sliver rejecting amount can be accurately and rapidly adjusted, and the sliver rejecting adjusting and controlling accuracy and efficiency 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 stem removal control method and system during a cigarette making process. Background Art

[0002] With the continuous development of high-end cigarettes and medium and thin cigarettes, consumers have higher and higher requirements for cigarette quality (including appearance quality, physical quality and sensory quality). Stem refers to the smaller strips of tobacco stems contained in tobacco. Since the stems cannot be completely removed during the leaf-beating and re-roasting stage of tobacco raw materials, it is inevitable that there will be a certain amount of stems in the tobacco when rolling. As the circumference of medium and thin cigarettes decreases, the excessive content of stems in the tobacco (including the number and size of stems) is easy to cause cigarette puncture. The increase in the puncture ratio of cigarettes will cause defects in the appearance quality of cigarettes, affecting consumers' experience of the product and the reputation of the brand; in addition, the stems in cigarettes have a certain influence on the stability of cigarette quality (including cigarette weight, draw resistance and density consistency, etc.). Excessive stem content in cigarettes will lead to poor combustion uniformity of tobacco, resulting in undesirable phenomena such as uneven end faces, burning cones and popping during cigarette combustion, and will have a significant impact on the sensory smoking quality of cigarettes.

[0003] To this end, a cigarette machine stem separation system is set up in the feeding system of the cigarette machine to remove the stems contained in the tobacco. The cigarette machine stem separation system includes a high-speed feeding belt that throws the tobacco into the wind chamber and an air separation device. The air separation device consists of an air inlet for replenishing fresh air and a vertical rectangular wind chamber. The upper fan of the wind chamber provides negative pressure, and fresh air is replenished through the air inlet to achieve gas-driven material movement. The tobacco and stems are separated by using the different suspension speeds of tobacco and stems, and the stems contained in the tobacco are removed. At present, with the continuous development of cigarettes, the specifications of cigarettes are constantly changing. When producing cigarettes of different brands, due to the different suspension speeds of tobacco and stems, operators can only rely on experience to adjust the negative pressure of the air separation device fan or the opening of the air inlet of the air separation device. When the negative pressure of the fan of the air separation device or the opening of the air inlet of the air separation device is adjusted based on experience and hand feeling, the change range of the stem flow rate may be too large or too small, and the balance point of the suspended separation of tobacco and stems cannot be found quickly, resulting in low stem removal accuracy and poor removal effect; and the need to repeatedly adjust back and forth reduces the removal efficiency, and invisibly increases the workload of the operator, causing unnecessary damage to the equipment. Summary of the invention

[0004] The object of the present invention is to provide a stem removal control method and system for a cigarette rolling process, so as to solve the problems of low accuracy and low efficiency of stem removal in the prior art.

[0005] In order to solve the above technical problems, the present invention provides a method for controlling the removal of stems during a rolling process, comprising:

[0006] Determine the stem picking removal adjustment amount according to the absolute value of the difference between the target stem picking removal amount and the measured actual stem picking removal amount;

[0007] According to the size of the stem rejection adjustment amount, choose to adjust the fan negative pressure or adjust the air inlet opening of the air separation device. When the stem rejection adjustment amount is large, choose to adjust the fan negative pressure; when the stem rejection adjustment amount is small, choose to adjust the air inlet opening of the air separation device.

[0008] Furthermore, the air inlet of the wind separation device includes an upper air inlet and a lower air inlet, the upper air inlet is arranged parallel to the side wall of the wind chamber of the wind separation device, and the lower air inlet is arranged obliquely to the side wall of the wind chamber of the wind separation device.

[0009] Furthermore, when the elimination adjustment amount is greater than the first threshold, the fan negative pressure is selected to be adjusted; when the elimination adjustment amount is greater than or equal to the second threshold and less than or equal to the first threshold, the lower air inlet opening is selected to be adjusted; when the elimination adjustment amount is less than the second threshold, the upper air inlet opening is selected to be adjusted; the first threshold is greater than the second threshold.

[0010] Furthermore, the target stem removal amount is determined based on at least two indicators among cigarette weight, circumference, draw resistance, hardness, total ventilation rate, filter ventilation, dust content / end thread drop, density distribution consistency, dynamic draw resistance, segmented draw resistance and dropped cigarette butts.

[0011] Furthermore, the method for determining the actual stem stick rejection amount is: collecting stem stick samples from the stem stick rejection port of the air separation device and weighing them, calculating the weight of the stem sticks rejected per minute, and using a method of taking multiple samples and averaging the average to calculate the average weight of the stem sticks rejected per minute, which is used as the actual stem stick rejection amount.

[0012] The beneficial effects of the above technical scheme are as follows: the present invention is an improved invention, after determining the stem stick removal adjustment amount according to the absolute value of the difference between the target stem stick removal amount and the measured actual stem stick removal amount, the parameter adjustment method of the air separation device in the stem stick separation system of the cigarette making machine is selected according to the size of the removal adjustment amount. When the stem stick removal adjustment amount is large, the size of the fan negative pressure is adjusted; when the stem stick removal adjustment amount is small, the air inlet opening of the air separation device is adjusted, that is, according to the size of the stem stick removal adjustment amount, different adjustment ranges are selected for precise control, which can accurately and quickly adjust to the target stem stick removal amount, improve the accuracy and efficiency of the stem stick removal control during the rolling process, avoid the adjustment method based on experience and feel that causes the change range of the stem stick flow to be too large or too small, and it is difficult to find the balance point of the suspended separation of tobacco shreds and stem sticks, and the adjustment uncertainty and instability caused by repeated back and forth adjustments are required, so that the stem stick removal amount can be quickly and stably within the target range, which helps to improve the stability of the cigarette rolling process and product quality.

[0013] In order to solve the above technical problems, the present invention also provides a control system for stem stick removal during the rolling process, including a controller, the controller is connected to an actual stem stick removal amount measuring device, and respectively controls a fan negative pressure regulating valve for adjusting the size of the wind pressure negative pressure and an adjusting device for adjusting the air inlet opening of an air separation device. The controller is used to determine the stem stick removal adjustment amount according to the absolute value of the difference between the target stem stick removal amount and the measured actual stem stick removal amount; according to the size of the stem stick removal adjustment amount, it is selected to adjust the size of the fan negative pressure or adjust the air inlet opening of the air separation device. When the stem stick removal adjustment amount is large, it is selected to adjust the size of the fan negative pressure; when the stem stick removal adjustment amount is small, it is selected to adjust the air inlet opening of the air separation device.

[0014] Furthermore, the air inlet of the air separation device includes an upper air inlet and a lower air inlet, and the air inlet opening adjustment device of the air separation device includes an upper air inlet adjustment device for adjusting the opening of the upper air inlet and a lower air inlet adjustment device for adjusting the opening of the 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 inclined to the side wall of the air chamber of the air separation device.

[0015] Furthermore, when the elimination adjustment amount is greater than the first threshold, the fan negative pressure is selected to be adjusted; when the elimination adjustment amount is greater than or equal to the second threshold and less than or equal to the first threshold, the lower air inlet opening is selected to be adjusted; when the elimination adjustment amount is less than the second threshold, the upper air inlet opening is selected to be adjusted; the first threshold is greater than the second threshold.

[0016] Furthermore, the target stem removal amount is determined based on at least two indicators among cigarette weight, circumference, draw resistance, hardness, total ventilation rate, filter ventilation, dust content / end thread drop, density distribution consistency, dynamic draw resistance, segmented draw resistance and dropped cigarette butts.

[0017] Furthermore, the method for determining the actual stem stick rejection amount is as follows: a device for determining the actual stem stick rejection amount collects and weighs stem stick samples from a stem stick rejection port of an air separation device, calculates the weight of stem sticks rejected per minute, and uses a method of taking an average value by taking multiple samples to calculate the average weight of stem sticks rejected per minute, which is used as the actual stem stick rejection amount.

[0018] The beneficial effects of the above technical scheme are as follows: the present invention is an improved invention, after determining the stem stick removal adjustment amount according to the difference between the target stem stick removal amount and the measured actual stem stick removal amount, the parameter adjustment method of the air separation device in the stem stick separation system of the cigarette making machine is selected according to the size of the removal adjustment amount. When the stem stick removal adjustment amount is large, the size of the fan negative pressure is adjusted; when the stem stick removal adjustment amount is small, the air inlet opening of the air separation device is adjusted, that is, according to the size of the stem stick removal adjustment amount, different adjustment ranges are selected for precise control, which can accurately and quickly adjust to the target stem stick removal amount, improve the accuracy and efficiency of the stem stick removal control during the rolling process, avoid the adjustment method based on experience and feel that causes the stem stick flow rate to change too much or too little, and it is difficult to find the balance point of the suspended separation of tobacco shreds and stem sticks, and the adjustment uncertainty and instability caused by repeated back and forth adjustments are required, so that the stem stick removal amount can be 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

[0019] Figure 1 1. It is a flow chart of stem rejection control in the rolling process of the method embodiment of the present invention;

[0020] Figure 2 It is a schematic diagram of the overall structure of the air separation device of the cigarette making machine stem separation system in the overall position of the cigarette making machine according to the method embodiment of the present invention;

[0021] Figure 3 is a flow chart of selecting an adjustment scheme according to an embodiment of the method of the present invention;

[0022] Figure numerals: 1-fan negative pressure regulating valve; 2-lower air inlet; 3-upper air inlet. DETAILED DESCRIPTION

[0023] 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.

[0024] The present invention determines the stem stick rejection adjustment amount according to the difference between the target stem stick rejection amount and the measured actual stem stick rejection amount, and then selects the parameter adjustment method of the air separation device in the stem stick separation system of the cigarette making machine according to the size of the rejection adjustment amount. When the stem stick rejection adjustment amount is large, the size of the fan negative pressure is adjusted; when the stem stick rejection adjustment amount is small, the air inlet opening of the air separation device is adjusted, that is, according to the size of the stem stick rejection adjustment amount, adjustment methods with different adjustment amplitudes are selected for precise control, which can accurately and quickly adjust to the target stem stick rejection amount, improve the accuracy and efficiency of the stem stick rejection regulation in the rolling process, avoid the adjustment method based on experience and feel that causes the stem stick flow rate to change too much or too little, and it is difficult to find the balance point of the suspended separation of tobacco shreds and stem sticks, and the adjustment uncertainty and instability caused by repeated back and forth adjustment are required, so that the stem stick rejection amount can be quickly and stably within the target range, which helps to improve the stability of the cigarette rolling process and the product quality.

[0025] Method Embodiment

[0026] The present invention provides a method for controlling the removal of stems during rolling process. Figure 1 As shown, the following steps are included:

[0027] 1. Based on the rolling quality, the expected value of the stem stick removal process before rolling is obtained. The process expected value refers to the target stem stick removal amount.

[0028] The target stem removal amount can be directly selected from the existing stem removal amount process indicators corresponding to different brands of tobacco. As a preferred embodiment, in order to improve the quality of cigarettes, the present invention provides a method for determining the process expectation value, including:

[0029] 1) By using the control variable method, the fan negative pressure size and the air inlet opening of the air separation device with different gradients are set, and the other process parameters are executed according to the normal parameters and rolled; as another implementation method, in order to achieve more precise control, two air inlets of the air separation device with different wind directions and positions are set. The overall structure of the air separation device is as follows Figure 2 As shown, it includes a fan negative pressure regulating valve 1, an upper air inlet 3 arranged parallel to the side wall of the air chamber of the air separation device, and a lower air inlet 2 arranged obliquely to the side wall of the air chamber of the air separation device. At this time, different gradients of fan negative pressure, upper air inlet opening and lower air inlet opening are set, and the remaining process parameters are executed according to normal parameters and rolled;

[0030] 2) Conducting quality tests on the cigarettes obtained after rolling, measuring cigarette quality indicators such as cigarette weight, circumference, draw resistance, hardness, total ventilation rate, filter ventilation, dust content / end silk, density distribution consistency, dynamic draw resistance, segmented draw resistance and falling cigarette butts under different parameters, and determining the stem rejection amount corresponding to the cigarettes that meet consumer needs based on at least two of the above cigarette quality indicators, and using it as the process expectation value of the stem rejection amount before rolling. As an embodiment, the present invention selects the stem rejection amount corresponding to the cigarettes with no appearance quality defects, good quality stability, low material consumption and combustion state that meet consumer needs as the process expectation value of stem rejection before rolling based on the above-measured quality indicators, and records the parameters of each air separation device corresponding to the process expectation value, including the size of the fan negative pressure and the air inlet opening of the air separation device, or the size of the fan negative pressure, the upper air inlet opening and the lower air inlet opening.

[0031] 2. Collect stem samples from the stem rejection port of the air separation device and measure the actual stem rejection rate (g / min).

[0032] Specifically, the actual stem pickle rejection amount measuring device collects stem pickle samples from the stem pickle rejection port of the air separation device and weighs them, calculates the stem pickle rejection weight per minute, and uses the method of multiple sampling and averaging to calculate the average weight of the stem pickle rejection per minute, which is used as the actual stem pickle rejection amount. The formula for calculating the actual stem pickle rejection amount is:

[0033]

[0034] in, is the actual number of stems removed; x n It is the weight of stems rejected per minute in the nth sampling, in grams per minute (g / min); n is the number of samplings.

[0035] 3. Determine the stem pick removal adjustment amount based on the absolute value of the difference between the target stem pick removal amount and the actual stem pick removal amount measured, and select an adjustment plan based on the size of the stem pick removal adjustment amount.

[0036] In view of the current production status of the industry and the needs of enterprises for making cigarettes of different specifications, after repeated tests of various adjustment methods of the air separation device and the amount of stem stick rejection, it is determined that the negative pressure parameter of the air separation device for stem removal has a greater impact on the wind speed of the air separation device, so the change range of the stem stick flow is larger, and the size of the air intake of the air separation device has a smaller impact on the wind speed of the air separation device, so the change range of the stem stick flow is smaller. Therefore, the design selects an adjustment scheme according to the size of the stem stick rejection adjustment amount, and quickly and accurately adjusts the stem stick rejection amount to the expected value of the process. As an implementation method, according to the size of the stem stick rejection adjustment amount, the size of the fan negative pressure or the opening of the air inlet of the air separation device is adjusted. When the stem stick rejection adjustment amount is large, the size of the fan negative pressure is adjusted; when the stem stick rejection adjustment amount is small, the opening of the air inlet of the air separation device is adjusted. Specifically, when the stem stick rejection adjustment amount is greater than the first threshold, the size of the fan negative pressure is adjusted; when the stem stick rejection adjustment amount is less than or equal to the first threshold, the opening of the air inlet of the air separation device is adjusted.

[0037] As another embodiment, when two air inlets of the air separation device are set as described above, the air inlet opening of the air separation device includes an upper air inlet opening and a lower air inlet opening, and the size of the fan negative pressure, the upper air inlet opening or the lower air inlet opening is selected according to the size of the stem rejection adjustment amount, wherein the stem rejection adjustment amount for adjusting the fan negative pressure, adjusting the lower air inlet opening and adjusting the upper air inlet opening is reduced in sequence. As a specific embodiment, the judgment standard of the size of the adjustment amount can be set according to the size of the rejection adjustment amount, and the corresponding adjustment level can be set according to the size of the adjustment amount, and the corresponding adjustment method can be selected according to the adjustment level. For example, when the rejection adjustment amount is greater than the first threshold, the adjustment amount is judged to be large, and the adjustment level is set to level 1, corresponding to the adjustment of the wind pressure negative pressure; when the rejection adjustment amount is greater than or equal to the second threshold and less than or equal to the first threshold, the adjustment amount is judged to be medium, and the adjustment level is set to level 2, corresponding to adjusting the lower air inlet opening; when the rejection adjustment amount is less than the second threshold, the adjustment amount is judged to be small, and the adjustment level is set to level 3, corresponding to adjusting the upper air inlet opening, and the first threshold is greater than the second threshold. The judgment criteria of the adjustment amount and the corresponding adjustment level can be set according to the adjustment capacity and adjustment requirements of each adjustment device of the wind distribution device, and there is no limitation here. Figure 3 As shown, the first threshold is set to 50g / min, and the second threshold is set to 20g / min. When the rejection adjustment amount is greater than 50g / min, the fan negative pressure is adjusted by the fan negative pressure regulating valve to greatly change the wind speed in the air cavity of the air separation device to control the rejection amount of stems; when 50g / min≥rejection adjustment amount≥20g / min, the lower air inlet opening is adjusted by the lower air inlet opening adjustment device of the air separation device to slightly change the wind speed in the air cavity of the air separation device to control the rejection amount of stems; when the rejection adjustment amount is less than 20min, the upper air inlet opening is adjusted by the upper air inlet opening adjustment device of the air separation device to slightly change the wind speed in the air cavity of the air separation device to control the rejection amount of stems.

[0038] Among them, the greater the negative pressure of the fan of the air separation device, the greater the wind speed in the air cavity of the air separation device, the smaller the amount of stems removed, and the higher the proportion of tobacco returned to the cigarette machine with the rising airflow; the smaller the negative pressure of the fan, the smaller the wind speed in the air cavity of the air separation device, the greater the amount of stems removed, and the lower the proportion of tobacco returned to the cigarette machine with the rising airflow. The larger the opening of the air inlet on the air separation device, the smaller the wind speed in the air cavity of the air separation device, the greater the amount of stems removed, and the lower the proportion of tobacco returned to the cigarette machine with the rising airflow; the smaller the opening of the air inlet on the air separation device, the greater the wind speed in the air cavity of the air separation device, the smaller the amount of stems removed, and the higher the proportion of tobacco returned to the cigarette machine with the rising airflow. The larger the opening of the lower air inlet of the air separator device, the smaller the wind speed in the air cavity of the air separator device, the larger the amount of stems removed, and the lower the proportion of tobacco returning to the cigarette machine with the rising airflow; the smaller the opening of the lower air inlet of the air separator device, the greater the wind speed in the air cavity of the air separator device, the smaller the amount of stems removed, and the higher the proportion of tobacco returning to the cigarette machine with the rising airflow.

[0039] 4. After the adjustment is completed, re-measure the rejected stems to make them meet the process expectations. If not, continue to adjust according to the above steps until the measured stem removal amount meets the process expectations.

[0040] System Example

[0041] The present invention provides a control system for removing stem sticks during a rolling process, comprising a controller, wherein the controller is connected to a device for measuring the amount of actual stem stick removal, and respectively controls a negative pressure regulating valve of a fan for adjusting the size of wind pressure and negative pressure, and an adjusting device for adjusting the opening of an air inlet of an air distribution device. The controller is used to implement a control method for removing stem sticks during a rolling process. The specific implementation process of the method has been described in detail in the method embodiment and will not be repeated here.

[0042] Verification Example

[0043] According to the above-mentioned stem removal control system during rolling process, stem removal control is performed on three types of cigarettes according to the stem removal control method during rolling process. The control process is as follows:

[0044] The expected value of stem rejection in the rolling process of a certain brand of slim cigarette A is 40-60g / min, and the actual stem rejection amount measured is 115g / min. The measured value differs from the target value by 55g / min, and the adjustment amount of stem rejection is large (the absolute value of the difference is greater than 50g / min). The stem rejection is regulated by adjusting the negative pressure regulating valve of the fan of the stem separation system of the cigarette machine, and the negative pressure of the fan (adjustment range: 0-1MPa) is adjusted from 0.2MPa to 0.3MPa. The wind speed in the wind chamber of the air separation device is increased, and the amount of stems rejected is reduced. After regulation, the stem rejection amount is re-measured to be 50g / min, which is within the expected value range of the stem rejection process and is suitable for the rolling process of slim cigarette A.

[0045] The expected value of stem rejection in the rolling process of a certain brand of slim cigarette B is 30-50g / min, and the actual measured stem rejection is 80g / min. The measured value differs from the target value by 30g / min, and the stem rejection adjustment is moderate (the absolute value of the difference is ≥20g / min and ≤50g / min). The stem rejection is regulated by adjusting the lower air inlet opening of the air separation device of the cigarette machine stem separation system. The lower air inlet opening of the air separation device (adjustment range: 0-100%) is adjusted from 80% to 50%, the wind speed in the air cavity of the air separation device is increased, and the amount of stems rejected is reduced. After regulation, the stem rejection is re-measured to be 40g / min, which is within the expected value range of the stem rejection process and is suitable for the rolling process of slim cigarette B.

[0046] The expected value of stem rejection in the rolling process of a certain brand of slim cigarette C is 25-45g / min, and the actual measured stem rejection is 20g / min. The measured value differs from the target value by 5g / min, and the adjustment amount of stem rejection is small (the absolute value of the difference is less than 20g / min). The stem rejection is regulated by adjusting the opening of the upper air inlet of the wind separation device of the stem separation system of the cigarette machine. The opening of the upper air inlet of the wind separation device (adjustment range: 0-100%) is adjusted from 50% to 70%, the wind speed in the wind cavity of the wind separation device is reduced, and the amount of stems rejected is increased. After regulation, the stem rejection is re-measured to be 35g / min, which is within the expected value range of the stem rejection process and is suitable for the rolling process of slim cigarette C.

[0047] The stem stick removal control method and system of the rolling process of the present invention can design different adjustment methods according to the different amplitudes of the stem stick adjustment amount to accurately control the stem stick removal amount to meet the process requirements, improve the accuracy and efficiency of the stem stick removal regulation in the rolling process, avoid the uncertainty and instability of the cigarette machine stem stick separation system adjusted by human experience, and make the stem stick removal amount stably within the target range, which is helpful to improve the stability of the cigarette rolling process and product quality, without the need for repeated back and forth adjustment, reducing the workload of operators and reducing the loss of wind separation device equipment. In addition, multiple control means are integrated to control the stem stick removal amount of cigarettes with different circumference sizes.

Claims

1. A method for controlling stem removal during rolling process, characterized in that: include: Determine the stem picking removal adjustment amount according to the absolute value of the difference between the target stem picking removal amount and the measured actual stem picking removal amount; According to the size of the stem rejection adjustment amount, choose to adjust the fan negative pressure or adjust the air inlet opening of the air separation device. When the stem rejection adjustment amount is large, choose to adjust the fan negative pressure; when the stem rejection adjustment amount is small, choose to adjust the air inlet opening of the air separation device.

2. The method for controlling stem removal during rolling process according to claim 1, characterized in that: The air inlet of the air separation device comprises 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.

3. The method for controlling stem removal during rolling process according to claim 2, characterized in that: When the rejection adjustment amount is greater than the first threshold, the fan negative pressure is adjusted; when the rejection adjustment amount is greater than or equal to the second threshold and less than or equal to the first threshold, the lower air inlet opening is adjusted; When the rejection adjustment amount is less than the second threshold, the upper air inlet opening is adjusted; The first threshold is greater than the second threshold.

4. The method for controlling stem removal during rolling process according to any one of claims 1 to 3, characterized in that: The target stem rejection amount is determined based on at least two indicators among cigarette weight, circumference, draw resistance, hardness, total ventilation rate, filter ventilation, dust content / end thread drop, density distribution consistency, dynamic draw resistance, segmented draw resistance and dropped cigarette butts.

5. The method for controlling stem removal during rolling process according to any one of claims 1 to 3, characterized in that: The method for determining the actual stem pickle rejection amount is as follows: collecting stem pickle samples from the stem pickle rejection port of the air separation device and weighing them, calculating the weight of the stem pickles rejected per minute, and using a method of taking multiple samples and averaging the average to calculate the average weight of the stem pickles rejected per minute, which is used as the actual stem pickle rejection amount.

6. A control system for removing stems during rolling, comprising a controller, the controller being connected to a device for measuring the amount of stems removed, and controlling a negative pressure regulating valve of a fan for adjusting the magnitude of wind pressure and negative pressure, and a regulating device for adjusting the opening of an air inlet of an air distribution device, respectively, characterized in that: The controller is used to determine the stem stick rejection adjustment amount according to the absolute value of the difference between the target stem stick rejection amount and the measured actual stem stick rejection amount; according to the size of the stem stick rejection adjustment amount, the size of the fan negative pressure is adjusted or the opening of the air inlet of the air separation device is adjusted. When the stem stick rejection adjustment amount is large, the size of the fan negative pressure is adjusted; when the stem stick rejection adjustment amount is small, the opening of the air inlet of the air separation device is adjusted.

7. The stem-stick removal control system for the rolling process according to claim 6 is characterized in that: The air inlet of the air separation device includes an upper air inlet and a lower air inlet. The air inlet opening adjustment device of the air separation device includes an upper air inlet adjustment device for adjusting the opening of the upper air inlet and a lower air inlet adjustment device for adjusting the opening of the 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 inclined to the side wall of the air chamber of the air separation device.

8. The stem-stick removal control system for the rolling process according to claim 7, characterized in that: When the rejection adjustment amount is greater than the first threshold, the fan negative pressure is adjusted; when the rejection adjustment amount is greater than or equal to the second threshold and less than or equal to the first threshold, the lower air inlet opening is adjusted; When the rejection adjustment amount is less than the second threshold, the upper air inlet opening is adjusted; The first threshold is greater than the second threshold.

9. The stem-stick removal control system for the rolling process according to any one of claims 6 to 8, characterized in that: The target stem rejection amount is determined based on at least two indicators among cigarette weight, circumference, draw resistance, hardness, total ventilation rate, filter ventilation, dust content / end thread drop, density distribution consistency, dynamic draw resistance, segmented draw resistance and dropped cigarette butts.

10. The stem-stick removal control system for the rolling process according to any one of claims 6 to 8, characterized in that: The method for determining the actual stem stick rejection amount is as follows: a device for determining the actual stem stick rejection amount collects and weighs stem stick samples from a stem stick rejection port of an air separation device, calculates the weight of stem sticks rejected per minute, and uses a method of taking an average value by taking multiple samples to calculate the average weight of stem sticks rejected per minute, which is used as the actual stem stick rejection amount.

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