Online cigarette ventilation level detection system

Abstract

The application discloses an online cigarette ventilation degree detection system, which introduces statistical parameters in the cigarette ventilation degree detection and control process for the first time, and uses the statistical parameters to adjust the focal length of a focusing device of a puncher, and uses the obtained average evaluation parameter to adjust and control the laser energy of the puncher. The setting avoids the adverse effects of the normal fluctuation of the ventilation degree detection value of a single cigarette on the stability of the control system, and avoids the adverse effects of the fluctuation of the ventilation degree detection value of a single cigarette caused by the swing of the cigarette and the fluctuation of the laser energy on the stability of the control system, so that effective, stable and automatic closed-loop adjustment and control are realized.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of cigarette production, and particularly relates to an online cigarette ventilation degree detection system. BACKGROUND

[0002] For the old PROTOS 70 type cigarette making machine, after the online laser puncher is installed, since the device does not have the cigarette ventilation degree detection and rejection function, the stability of the cigarette quality is affected, and the application of the online laser puncher is limited.

[0003] Although some new PROTOS cigarette making machines have the online ventilation degree detection and rejection function, the online cigarette ventilation degree closed-loop control and adjustment has not been realized.

[0004] According to the conventional closed-loop feedback control requirement, the current cigarette ventilation degree value obtained by the online ventilation degree detection device is fed back to the puncher to form a closed-loop feedback control loop for controlling the cigarette ventilation degree, and it is expected that the online cigarette ventilation degree control and adjustment function can be realized.

[0005] However, since there are several intermediate transmission drums between the detection drum where the cigarette ventilation degree detection device is located and the punch drum where the punch device is located, there is a long delay between the current cigarette ventilation degree obtained by the detection device and the actual cigarette ventilation degree formed by the punch; in addition, there are factors such as the fluctuation of the laser beam energy, the fluctuation of the rolling position when the cigarette is punched, the fluctuation of the cigarette machine speed, etc., which also affect the conventional ventilation degree detection and ventilation degree setting, and often, such feedback control is difficult to form a stable closed-loop system, and in fact, it may even cause greater fluctuation of the actual cigarette ventilation degree value. This is also the reason why the cigarette ventilation degree detection has not been able to form a closed-loop feedback and automatic control with the punching work of the puncher, and there is no device in the world that can form a closed-loop control between the cigarette ventilation degree detection and the puncher.

[0006] The information disclosed in this BACKGROUND section is only for the purpose of increasing the understanding of the background of the present application and should not be regarded as an acknowledgment or any form of suggestion that this information forms prior art that is publicly known. SUMMARY

[0007] The present application aims to provide an online cigarette ventilation degree detection system to overcome the defects in the prior art.

[0008] To achieve the above-mentioned purpose, the present application provides an online cigarette ventilation degree detection system, comprising:

[0009] The online cigarette ventilation degree detection device detects the ventilation degree value of each cigarette under the coordination of the synchronization signal.

[0010] A cigarette rejection unit for rejecting a cigarette with unqualified ventilation detection data according to an electrical signal from the online cigarette ventilation detection device or the online laser punching device;

[0011] An online laser punching device for punching a cigarette to form a cigarette with a certain ventilation degree;

[0012] The online cigarette ventilation detection device and the cigarette rejection unit are respectively connected to the online laser punching device through a data line for transmission of synchronous signals and data.

[0013] An online cigarette ventilation control system, comprising:

[0014] An online cigarette ventilation detection device for detecting a ventilation value of each cigarette under the coordination of a synchronous signal;

[0015] An online laser punching device for punching a cigarette to form a cigarette with a certain ventilation degree;

[0016] The online cigarette ventilation detection device is connected to the online laser punching device through a data line for transmission of synchronous signals and detection data.

[0017] The online laser punching device controls the output energy of a laser light source according to an average value of detection data fed back by the online cigarette ventilation detection device, so as to stabilize the average value of the cigarette ventilation detection data.

[0018] Preferably, in the above technical solution, the synchronous signal is composed of a machine clock pulse emitted by a cigarette making machine, a cigarette arrival pulse emitted by a control unit of the laser punching device, or a cigarette arrival pulse detected by an independent sensor.

[0019] Preferably, in the above technical solution, the online cigarette ventilation detection device is selected from the following combinations: a ventilation or / and air tightness detection device, a ventilation or / and draw resistance detection device, a ventilation and air leakage and draw resistance detection device.

[0020] Preferably, in the above technical solution, the online cigarette ventilation detection device further comprises a matching operation control unit for calculating a ventilation degree and evaluation parameters through an internally set algorithm; the evaluation parameters include results and data of statistical operation and comparison operation as described below.

[0021] Preferably, in the above technical solution, the rejection detection sensor is located downstream of the rejection unit and sends a pulse signal to detect a gap formed by a cigarette conveying flow after a rejected cigarette.

[0022] Preferably, the communication data line between the cigarette ventilation degree detection device and the online laser drilling device comprises a data bus and a response clock transmission line, the data bus is responsible for transmitting the ventilation degree and the evaluation parameter, the response clock transmission line transmits the response pulse between the operation control unit and the control unit of the drilling device, and the data bus comprises a data bus running a network protocol such as TCP / IP or a bus CAN protocol, preferably a CAN bus.

[0023] Preferably, the response pulse comprises a response clock pulse sequence or a single response pulse.

[0024] When the operation control unit sends the response clock pulse sequence or the single response pulse, the control unit starts receiving the ventilation degree and the evaluation parameter through the bus after receiving the response pulse, and performs corresponding operations.

[0025] When the operation control unit does not send the response clock pulse, the control unit does not receive the bus data, thereby reducing the workload of the control unit.

[0026] An online cigarette ventilation degree evaluation parameter calculation method comprises the following steps.

[0027] Statistical operation:

[0028] GVi is the current cigarette ventilation degree value, which comprises the ventilation degree values of all cigarettes passing through the detection device.

[0029] GVi average value = ∑ (GV1 + + + DVn) / n, which is the average value of the ventilation degrees of the first n cigarettes, and the standard deviation SD and the variation coefficient CV% (i.e., the relative deviation) are calculated.

[0030] Comparison operation:

[0031] GVi is the absolute value of the instantaneous deviation between the current cigarette ventilation degree and the set value, which comprises the ventilation degree values of all cigarettes passing through the detection device.

[0032] GVi instantaneous deviation = |GVi-GV set |.

[0033] V is the deviation between the GVi average value and the GV set value.

[0034] GVi average value deviation = (GVi average value-GV set) = V.

[0035] Wherein: n: the average value of the sampling cigarette set number; GVi: the current ventilation degree detection value; GV set: the set number of the cigarette ventilation degree; GV average: the average value of the n cigarette ventilation degree GVi; P: the set number of the allowed instantaneous deviation; P2: the adjustment stability zone; SD: the standard deviation, the allowed set value is sd; CV: the coefficient of variation, the allowed set value is cv; T0: the punch time adjustment base number.

[0036] Preferably, in the above technical solution, P is set to 2.5; P2 is set to 1.5; sd is set to 0.5-2.5 or 1.5; cv is set to 4%-15% or 10%; T0 is set to 0.2-0.5 microseconds.

[0037] When the ventilation degree detection device only has a ventilation degree unit, the following methods are selected:

[0038] Or providing a constant air pressure at the lit end of the cigarette and forming a constant air flow through the micro-hole nozzle, setting a pressure sensor P2 at the filter end to detect the remaining air pressure, and after operation, the values of the cigarette draw resistance and the cigarette ventilation degree = K1*P2, wherein K1 is an adjustment coefficient determined according to different cigarette processes and materials;

[0039] Or setting pressure sensors P1 and P2 at the lit end and the filter end of the cigarette at the same time, and after operation, the values of the cigarette draw resistance and the cigarette ventilation degree = K2*(P1-P2), wherein K2 is an adjustment coefficient determined according to different cigarette processes and materials;

[0040] The micro-hole nozzle is arranged between the air outlet end of the constant pressure air supply and the air inlet end of the detection unit, and the micro-hole is used to convert the constant pressure air flow into a constant flow air flow due to the large air resistance of the micro-hole, thereby reducing the fluctuation of the detection data caused by the switching of the cigarette. The diameter of the micro-hole is 0.12-2mm.

[0041] The ventilation degree detection device is a combination of a ventilation degree detection unit and an air tightness leakage detection unit. The cigarette ventilation degree detection unit detects the ventilation degree of the cigarette while detecting the air tightness leakage of the cigarette using the air tightness leakage detection unit. The value of the air tightness leakage is used to correct the value of the ventilation degree, thereby increasing the accuracy of the cigarette ventilation degree detection value.

[0042] At this time, if the cigarette air tightness leakage detection unit finds that the cigarette has air tightness leakage, the operation control unit sends a rejection signal corresponding to the cigarette, and after the cigarette is rejected, the obtained cigarette ventilation degree data is deleted and does not enter the statistical operation, thereby reducing the influence of the deviation ventilation degree of the leakage cigarette on the normal cigarette data.

[0043] The online cigarette ventilation degree detection method, ventilation degree detection device is combined by ventilation degree detection unit and draw resistance detection unit, ventilation degree detection unit detects cigarette ventilation degree, draw resistance detection unit detects open draw resistance PD value of cigarette, and PD value draw resistance value is used to correct ventilation degree value, which increases accuracy of cigarette ventilation degree detection value.

[0044] Cigarette ventilation degree detection value=K3*(P1-P2-PD) wherein K3 is adjustment coefficient, which is determined according to different cigarette process and material.

[0045] The online cigarette automatic rejection and ventilation degree automatic adjustment control method uses data obtained by the above calculation method and carries out the following steps:

[0046] When GVi instantaneous deviation, i.e. |(GVi-GV set)|>P, operation control unit or control unit of perforating device sends rejection pulse to trigger cigarette rejection unit, so that cigarette with instantaneous deviation exceeding allowable deviation P is rejected;

[0047] When: standard deviation SD>sd, or coefficient of variation CV%>cv%, signal of focus adjustment of perforating focusing device is sent;

[0048] When: standard deviation SD<sd, and coefficient of variation CV%<cv%,

[0049] If |(GVi average-GV set)|≤P2: no operation NOP is carried out;

[0050] If |(GVi average-GV set)|>P2 and (GVi average-GV set-P2)>0, operation control unit or control unit of perforating device sends signal of perforating time reduction by a base T0;

[0051] If |(GVi average-GV set)|>P2 and (GVi average-GV set-P2)<0, operation control unit or control unit of perforating device sends signal of perforating time increase by a base T0;

[0052] The online cigarette rejection verification method is carried out according to the following steps: rejection detection sensor detects gap formed by cigarette conveying flow after cigarette is rejected, if gap appears in cigarette flow corresponding to the position of the rejected cigarette, the cigarette has been rejected; if no gap appears in cigarette flow corresponding to the position of the rejected cigarette, the cigarette has not been rejected or rejection failure, which constitutes verification function of rejection unit.

[0053] Compared with prior art, the application has the following beneficial effects:

[0054] The present application overcomes the problems and deficiencies of conventional feedback systems, and uses the parameter value of the average ventilation degree of a certain number of cigarettes as the signal of closed-loop feedback to realize the stable ventilation degree control of cigarettes. BRIEF DESCRIPTION OF DRAWINGS

[0055] Figure 1 The figure is a structural schematic diagram of the present application;

[0056] Figure 2 The figure is a ventilation degree calculation and control flowchart;

[0057] Figure 3 The figure is a rejection principle schematic diagram;

[0058] Figure 4 The figure is a rejection verification principle schematic diagram;

[0059] Figure 5 The figure is a response communication schematic diagram;

[0060] Figure 6 The figure is a ventilation degree detection unit;

[0061] Figure 7 The figure is a microporous constant-flow nozzle;

[0062] Figure 8 The figure is a combination of the ventilation degree unit and the air-tight leakage unit;

[0063] Figure 9 The figure is the operation flowchart of the combination of the ventilation degree unit and the air-tight leakage unit;

[0064] Figure 10 The figure is a combination of the suction resistance unit and the ventilation degree unit. DETAILED DESCRIPTION

[0065] The specific embodiments of the present application are described in detail below, but it should be understood that the protection scope of the present application is not limited by the specific embodiments.

[0066] Unless otherwise explicitly stated, in the entire specification and claims, the term "comprise" or its variants such as "contain" or "include" and the like will be understood to include the stated element or component, but not to exclude the presence of other elements or components.

[0067] An online cigarette ventilation degree detection system, comprising:

[0068] The online cigarette ventilation degree detection device detects the ventilation degree value of each cigarette under the coordination of the synchronization signal;

[0069] The cigarette rejection unit is used to reject the cigarettes with unqualified ventilation degree detection data according to the electric signal sent by the online cigarette ventilation degree detection device or the online laser punching device.

[0070] Online laser perforating device for perforating cigarette to form a certain ventilation degree of cigarette;

[0071] The online cigarette ventilation degree detection device and the cigarette rejection unit are respectively connected with the online laser perforating device through data line communication to transmit synchronous signals and data.

[0072] The online cigarette ventilation degree control system comprises:

[0073] The online cigarette ventilation degree detection device detects the ventilation degree value of each cigarette under the coordination of the synchronous signals.

[0074] Online laser perforating device for perforating cigarette to form a certain ventilation degree of cigarette;

[0075] The online cigarette ventilation degree detection device is connected with the online laser perforating device through data line communication to transmit synchronous signals and detection data.

[0076] The online laser perforating device controls the output energy of the laser light source according to the average value of the detection data fed back by the online cigarette ventilation degree detection device, so as to stabilize the average value of the cigarette ventilation degree detection data.

[0077] Preferably, in the above technical solution, the synchronous signals are composed of machine clock pulses emitted by the cigarette making machine, or cigarette arrival pulses emitted by the control unit of the laser perforating device, or cigarette arrival pulses detected by an independent sensor.

[0078] Preferably, in the above technical solution, the online cigarette ventilation degree detection device is selected from the following combinations: ventilation degree or / and air tightness detection device, ventilation degree or / and suction resistance detection device, ventilation degree and air leakage and suction resistance detection device.

[0079] Preferably, in the above technical solution, the online cigarette ventilation degree detection device further comprises a matched operation control unit which calculates the ventilation degree and evaluation parameters through an internally set algorithm; the evaluation parameters include the results and data of statistical operation and comparison operation as described below.

[0080] Preferably, in the above technical solution, the rejection detection sensor is located downstream of the rejection unit and sends pulse signals to detect the gap formed by the cigarette conveying flow after the rejected cigarette.

[0081] Preferably, in the above technical solution, the communication data line between the cigarette ventilation degree detection device and the online laser punching device comprises a data bus and a response clock transmission line, the data bus is responsible for transmitting the ventilation degree and the evaluation parameter, the response clock transmission line transmits the response pulse between the operation control unit and the control unit of the punching device, and the data bus comprises a data bus running a network protocol such as TCP / IP or a bus CAN protocol, preferably a CAN bus.

[0082] Preferably, in the above technical solution, the response pulse comprises a response clock pulse sequence or a single response pulse.

[0083] When the operation control unit sends the response clock pulse sequence or the single response pulse, after the control unit receives the response pulse, the control unit starts receiving the ventilation degree and the evaluation parameter through the bus and performs corresponding operations.

[0084] When the operation control unit does not send the response clock pulse, the control unit does not receive the bus data, thereby reducing the workload of the control unit.

[0085] An online cigarette ventilation degree evaluation parameter calculation method comprises the following steps.

[0086] Statistical operation:

[0087] GVi is the current cigarette ventilation degree value, which comprises the ventilation degree values of all cigarettes passing through the detection device.

[0088] GVi average value = ∑ (GV1 + + + DVn) / n, which is the average value of the ventilation degrees of the previous n cigarettes, and the standard deviation SD and the variation coefficient CV% (i.e., the relative deviation) are calculated.

[0089] Comparison operation:

[0090] GVi is the absolute value of the instantaneous deviation between the current cigarette ventilation degree and the set value, which comprises the ventilation degree values of all cigarettes passing through the detection device.

[0091] GVi instantaneous deviation = |GVi-GV set|.

[0092] V is the deviation between the GVi average value and the GV set value.

[0093] GVi average value deviation = (GVi average value-GV set) = V.

[0094] Wherein: n: the average value of the sampling cigarette set; GVi: the current ventilation degree detection value; GVset: the set value of the cigarette ventilation degree; GVaverage: the average value of the n cigarette ventilation degrees GVi; P: the set value of the allowed instantaneous deviation; P2: the adjustment stable zone; SD: the standard deviation, the set value of the allowed is sd; CV: the coefficient of variation, the set value of the allowed is cv; T0: the punch time adjustment base number.

[0095] Preferably, in the above technical solution, P is set to 2.5; P2 is set to 1.5; sd is set to 0.5-2.5 or 1.5; cv is set to 4%-15% or 10%; T0 is set to 0.2-0.5 microseconds.

[0096] An online cigarette automatic rejection and ventilation degree automatic adjustment control method, using the data obtained by the calculation method described above and performing the following steps:

[0097] When GVi instantaneous deviation, i.e. |(GVi-GVset)|>P, the operation control unit or the control unit of the punch device sends a rejection pulse to trigger the cigarette rejection unit, so that the cigarette with the instantaneous deviation exceeding the allowed deviation P is rejected;

[0098] When: the standard deviation SD>sd, or the coefficient of variation CV%>cv%, the signal of the punch focusing device for focus adjustment is sent;

[0099] When: the standard deviation SD<sd, and the coefficient of variation CV%<cv%,

[0100] If |(GVi average-GVset)|≤P2: no operation NOP is performed;

[0101] If |(GVi average-GVset)|>P2 and (GVi average-GVset-P2)>0, the operation control unit or the control unit of the punch device sends a signal for reducing the punch time by a base number T0;

[0102] If |(GVi average-GVset)|>P2 and (GVi average-GVset-P2)<0, the operation control unit or the control unit of the punch device sends a signal for increasing the punch time by a base number T0;

[0103] An online cigarette rejection verification method, according to the following steps: the rejection detection sensor detects the gap formed by the cigarette conveying flow after the rejected cigarette, if the gap appears in the cigarette flow corresponding to the position of the rejected cigarette, the cigarette has been rejected; if the gap does not appear in the cigarette flow corresponding to the position of the rejected cigarette, the cigarette has not been rejected or the rejection fails, which constitutes the verification function of the rejection unit.

[0104] The application will be further described below with reference to the accompanying drawings:

[0105] An online cigarette ventilation degree detection system, consisting of a synchronization signal, an online cigarette ventilation degree (including ventilation degree or / and air leakage detection, ventilation degree or / and draw resistance detection, ventilation degree or / and air tightness detection, ventilation degree and air leakage and air tightness and draw resistance detection) detection device, a matched operation control unit, a cigarette rejection unit, a rejection detection sensor, a data transmission line (including a protocol-based data bus or an independent data transmission line), an online cigarette laser punching device, including its focusing unit and control unit.

[0106] The online cigarette ventilation degree (including ventilation degree or / and air leakage detection, ventilation degree or / and draw resistance detection, ventilation degree or / and air tightness detection, ventilation degree and air leakage and air tightness and draw resistance detection) detection device detects the ventilation degree value GVi of each cigarette under the coordination of the synchronization signal, and the operation control unit performs the following steps or processes on the ventilation degree values of n cigarettes:

[0107] Wherein:

[0108] n: the set number of average value sampling cigarettes;

[0109] GVi: the current ventilation degree detection value;

[0110] GVset: the set number of cigarette ventilation degree;

[0111] GVaverage: the average value of n cigarette ventilation degrees GVi;

[0112] P: the set number of allowed instantaneous deviation, preferably 2.5;

[0113] P2: adjustment stability zone, preferably 1.5;

[0114] SD: standard deviation, the allowed set value is sd, 0.5-2.5, preferably 1.5;

[0115] CV: coefficient of variation, the allowed set value is cv, 4%-15%, preferably 10%;

[0116] T0: punching time adjustment base, preferably set to 0.2-0.5 microseconds;

[0117] Including:

[0118] ①Statistical operation:

[0119] GVi: the average value of the current n cigarette ventilation degrees:

[0120] GViaverage=∑(GV1+--+DVn) / n,

[0121] Calculate the standard deviation SD,

[0122] Calculate the coefficient of variation CV% (i.e. relative deviation);

[0123] GVi average, standard deviation SD, coefficient of variation CV% (i.e. relative deviation) are all statistical terms, the so-called standard deviation SD (StdDev, Standard Deviation) is the square root of variance, used to reflect the dispersion of a GVi data set.

[0124] The so-called coefficient of variation CV = (standard deviation SD / GVi average) x 100%, also known as standard deviation rate, indicates the relative degree of fluctuation.

[0125] ②Comparison operation:

[0126] GVi current cigarette ventilation degree and GV set value between the absolute value of instantaneous deviation:

[0127] GVi instantaneous deviation = |GVi-GV set|,

[0128] GVi cigarette ventilation degree average and GV set value between the deviation V:

[0129] GVi average deviation = (GVi average-GV set) = V.

[0130] ③Operation action:

[0131] 3.1 When: GVi instantaneous deviation, that is, | (GVi-GV set) | > P, the operation control unit or the control unit of the perforating device sends a rejection pulse to trigger the cigarette rejection unit, so that the cigarette with instantaneous deviation exceeding the allowable deviation P is rejected;

[0132] 3.2 When: standard deviation SD > sd preferably 1.5, or coefficient of variation CV% > cv% preferably 10%, send a signal to the perforating focusing device to adjust the focal length;

[0133] 3.3 When: standard deviation SD < sd preferably 1.5, and coefficient of variation CV% < cv% preferably 10%,

[0134] If | (GVi average-GV set) | ≤ P2: do nothing NOP;

[0135] If | (GVi average-GV set) | > P2 and (GVi average-GV set-P2) > 0, the operation control unit or the control unit of the perforating device sends a signal to reduce the perforating time by a base T0;

[0136] If | (GVi average-GV set) | > P2 and (GVi average-GV set-P2) < 0, the operation control unit or the control unit of the perforating device sends a signal to increase the perforating time by a base T0;

[0137] The online cigarette ventilation degree detection device is provided with an operation control unit, a cigarette rejection unit and a rejection detection sensor, and has a rejection unit verification function. The rejection detection sensor is located downstream of the rejection unit and detects the gap formed by the cigarette conveying flow after the cigarette is rejected. If a gap appears in the cigarette flow at the position corresponding to the rejected cigarette, the cigarette has been rejected. If no gap appears in the cigarette flow at the position corresponding to the rejected cigarette, the cigarette has not been rejected or the rejection fails, thereby forming the verification function of the rejection unit.

[0138] The online cigarette ventilation degree detection method is shown in Figure 6 and Figure 7 When the ventilation degree detection device is provided with only a ventilation degree unit, the following method is selected:

[0139] Or, a constant air pressure is provided at the lit end of the cigarette, a constant air flow is formed through the micro-hole nozzle, a pressure sensor P2 is arranged at the filter end to detect the residual air pressure, and the values of the cigarette draw resistance and the cigarette ventilation degree are formed after operation = K1*P2, wherein K1 is an adjustment coefficient and is determined according to different cigarette processes and materials.

[0140] Or, pressure sensors P1 and P2 are arranged at the lit end and the filter end of the cigarette respectively, and the values of the cigarette draw resistance and the cigarette ventilation degree are formed after operation = K2*(P1-P2), wherein K2 is an adjustment coefficient and is determined according to different cigarette processes and materials.

[0141] The micro-hole nozzle is arranged between the air outlet end of the constant pressure air supply and the air inlet end of the detection unit. The micro-hole is used to convert the constant pressure air flow into a constant flow air flow, thereby reducing the fluctuation of the detection data caused by the switching of the cigarette. The diameter of the micro-hole is 0.12-2mm.

[0142] The online cigarette ventilation degree detection method is shown in Figure 8 and Figure 9 The ventilation degree detection device is composed of a ventilation degree detection unit and an air-tightness leakage detection unit. The ventilation degree detection unit detects the ventilation degree of the cigarette, and the air-tightness leakage detection unit detects the air-tightness leakage of the cigarette. The value of the air-tightness leakage is used to correct the value of the ventilation degree, thereby increasing the accuracy of the ventilation degree detection value of the cigarette.

[0143] When the air-tightness leakage detection unit of the cigarette finds that the cigarette has air-tightness leakage, the operation control unit sends a rejection signal corresponding to the cigarette. After the cigarette is rejected, the obtained ventilation degree data of the cigarette is deleted and does not enter the statistical operation, thereby reducing the influence of the deviation ventilation degree of the leakage cigarette on the normal cigarette data.

[0144] The online cigarette ventilation degree detection method, as shown in the accompanying drawings, the ventilation degree detection device is composed of a ventilation degree detection unit and a draw resistance detection unit, the cigarette ventilation degree detection unit detects the ventilation degree of the cigarette, the draw resistance detection unit detects the open draw resistance PD value of the cigarette, and the PD value draw resistance value is used to correct the ventilation degree value, thereby increasing the accuracy of the cigarette ventilation degree detection value. Figure 10

[0145] Cigarette ventilation degree detection value = K3*(P1-P2-PD) wherein K3 is an adjustment coefficient, which is determined according to different cigarette processes and materials.

[0146] After the implementation of the present patent scheme, the statistical evaluation parameters (average value, standard deviation, and variation coefficient) of statistics are introduced for the first time in the cigarette ventilation degree detection and control process, and the obtained standard deviation and variation coefficient evaluation parameters are used to adjust the focal length of the focusing device of the puncher, and the obtained average value evaluation parameter is applied to adjust and control the laser energy of the puncher. Such a setting avoids the adverse effects of the normal fluctuation of the single cigarette ventilation degree detection value on the stability of the control system, and also avoids the adverse effects of the fluctuation of the single cigarette ventilation degree detection value caused by the swing of the cigarette rotation and the fluctuation of the laser energy on the stability of the control system, thereby realizing effective, stable, and automatic closed-loop adjustment and control.

[0147] The foregoing description of specific exemplary embodiments of the present application is intended to be illustrative only and not limiting of the application as a whole. These descriptions are not intended to limit the application to the precise forms or particular fields of use disclosed. Numerous modifications and alternatives are apparent in light of the above teachings to one skilled in the art. It is therefore intended that the scope of the application be limited only by the claims and equivalents thereof.​

Claims

1. A method for online automatic cigarette rejection and automatic ventilation adjustment control, characterized in that: The method is implemented using an on-line cigarette ventilation degree detection system, which includes: An on-line cigarette ventilation degree detection device, which detects the ventilation degree value of each cigarette under the coordination of a synchronization signal; A cigarette rejection unit, which is used to reject cigarettes with unqualified ventilation degree detection data according to the electrical signals sent by the on-line cigarette ventilation degree detection device or the on-line laser drilling device; An on-line laser drilling device, which is used to drill holes in cigarettes to form cigarettes with a certain ventilation degree; The on-line cigarette ventilation degree detection device and the cigarette rejection unit are respectively connected to the on-line laser drilling device through data lines for communication to transmit response clocks / response pulses and data; The method uses the data obtained by the on-line cigarette ventilation degree evaluation parameter calculation method and performs the following steps: When the instantaneous deviation of GVi, that is, |(GVi - GV set)| > P, The on-line cigarette ventilation degree detection device further includes a supporting operation control unit. The operation control unit or the control unit of the drilling device issues a rejection pulse to trigger the cigarette rejection unit, so that cigarettes with an instantaneous deviation exceeding the allowable deviation P are rejected; after the cigarettes are rejected, their detection data GVi still participates in statistical operations; the operation control unit calculates the ventilation degree and evaluation parameters through an internal algorithm; the rejection detection sensor is located downstream of the rejection unit and sends a pulse signal to detect the gap of the cigarette conveying flow after the rejected cigarettes; When: the standard deviation SD > sd, or the coefficient of variation CV > cv, a signal for adjusting the focal length of the drilling focusing device is issued; When: the standard deviation SD < sd, and the coefficient of variation CV < cv, If |(average value of GVi - GV set)| ≤ P2: no operation is performed; If |(average value of GVi - GV set)| > P2 and (average value of GVi - GV set - P2) > 0, the operation control unit or the control unit of the drilling device issues a signal to reduce the drilling time by a base number T0; If |(average value of GVi - GV set)| > P2 and (average value of GVi - GV set - P2) < 0, the operation control unit or the control unit of the drilling device issues a signal to increase the drilling time by a base number T0; The on-line cigarette ventilation degree evaluation parameter calculation method, which includes: Statistical operation: The current ventilation degree detection value of GVi, including the ventilation degree values of all cigarettes passing through the detection device except those rejected due to air leakage; The average value of GVi, that is, the average value obtained by summing the ventilation degree values of the first n cigarettes, and the standard deviation SD is calculated, and the coefficient of variation CV is calculated; Comparison operation: The absolute value of the instantaneous deviation between the current cigarette ventilation degree of GVi and the GV set value, including the ventilation degree values of all cigarettes passing through the detection device; GVi instantaneous deviation = |GVi - GV set|; The deviation V between the average value of GVi and the GV set value: GVi average value deviation = (average value of GVi - GV set) = V; Where: n: average number of cigarettes sampled; GVi: current ventilation detection value; GV setting: setting number of cigarette ventilation; GV average: average value of ventilation GVi of n cigarettes; P: setting number of allowable instantaneous deviation; P2: adjustment stability zone; SD: standard deviation, allowable setting value is sd; CV: coefficient of variation, allowable setting value is cv; T0: punching time adjustment base.

2. The method according to claim 1, characterized in that: P is set to 2.5; P2 is set to 1.5; sd is set to 0.5-2.5 or 1.5; cv is set to 4%-15% or 10%; T0 is set to 0.2-0.5 microseconds.

3. The method according to claim 1, characterized in that: The synchronization signal consists of a machine clock pulse emitted by the cigarette rolling machine, a cigarette arrival pulse emitted by the control unit of the laser drilling device, or a cigarette arrival pulse detected by an independent sensor.

4. The method according to claim 1, characterized in that: The ventilation unit and the airtightness leakage detection unit constitute an online cigarette ventilation detection device; or the ventilation unit and the suction resistance detection unit constitute an online cigarette ventilation detection device; or the ventilation unit, the airtightness leakage detection unit, and the suction resistance detection unit constitute an online cigarette ventilation detection device; or the ventilation detection device only has a ventilation unit.

5. The method according to claim 1 or 4, characterized in that: The communication data line between the online cigarette ventilation detection device and the online laser drilling device includes: a data bus and an acknowledgment clock transmission line. The data bus is responsible for transmitting ventilation and evaluation parameters. The acknowledgment clock transmission line transmits acknowledgment pulses between the calculation control unit and the control unit of the drilling device. The data bus includes a data bus running TCP / IP and CAN bus protocols.

6. The method according to claim 5, characterized in that: The response pulse may include a response clock pulse sequence or a single response pulse; When the operation and control unit sends a response clock pulse sequence or a single response pulse, after receiving the response pulse, the control unit begins to receive ventilation and evaluation parameters through the bus and performs corresponding operations. When the arithmetic control unit does not send an acknowledgment clock pulse, the control unit does not receive bus data, thereby reducing the workload of the control unit.

7. The method according to claim 4, characterized in that, When the ventilation measurement device only has a ventilation unit, one of the following methods shall be selected: Alternatively, a constant air pressure can be provided at the ignition end of the cigarette, and a constant airflow can be formed through a micro-orifice nozzle. A pressure sensor can be installed at the filter end to detect the remaining air pressure P1.

2. The calculated values ​​of cigarette draw resistance and cigarette ventilation are K1*P1.2, where K1 is an adjustment coefficient, which is determined according to different cigarette manufacturing processes and materials. Alternatively, pressure sensors can be installed at both the ignition end and the filter end of the cigarette to obtain data P1.1 and P1.

2. After calculation, the values ​​of cigarette draw resistance and cigarette ventilation are calculated as K2*(P1.1-P1.2), where K2 is an adjustment coefficient that depends on different cigarette manufacturing processes and materials. The micro-orifice nozzle is positioned between the outlet of the constant pressure air supply and the inlet of the detection unit. It utilizes the air resistance formed by the micro-orifice to convert the constant pressure airflow into a constant flow airflow, thereby reducing the fluctuation of the detection data caused by the switching of cigarettes. The micro-orifice diameter is 0.12-2mm.

8. The method according to claim 4, characterized in that: The ventilation detection device is composed of a ventilation detection unit and an air tightness leakage detection unit. While detecting the ventilation of the cigarette, the cigarette ventilation detection unit uses the cigarette air tightness leakage detection unit to detect the air tightness and leakage of the cigarette. The air tightness and leakage value is used to correct the ventilation value, thereby increasing the accuracy of the cigarette ventilation detection value. If the cigarette airtightness leakage detection unit detects an airtightness leak in a cigarette, the calculation control unit sends a rejection signal for that cigarette. Once the cigarette is rejected, the obtained cigarette ventilation data is deleted and not included in the statistical calculation, thereby reducing the impact of the deviation ventilation of leaking cigarettes on the normal cigarette data.

9. The method according to claim 1, characterized in that: It also includes online cigarette rejection verification, which is performed as follows: the rejection detection sensor detects the gaps in the cigarette conveying flow after the rejected cigarettes are rejected. If a gap appears in the cigarette flow corresponding to the position of the rejected cigarette, then the cigarette has been rejected; if no gap appears in the cigarette flow corresponding to the position of the rejected cigarette, then the cigarette has not been rejected or the rejection has failed, thus constituting the verification function of the rejection unit.

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