CN113003148A - Tobacco material mass flow measurement and control method based on laser scanning - Google Patents

Tobacco material mass flow measurement and control method based on laser scanning Download PDF

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Publication number
CN113003148A
CN113003148A CN202110203119.9A CN202110203119A CN113003148A CN 113003148 A CN113003148 A CN 113003148A CN 202110203119 A CN202110203119 A CN 202110203119A CN 113003148 A CN113003148 A CN 113003148A
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mass flow
tobacco material
laser scanning
density
tobacco
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李斌
李嘉康
鲁端峰
张大波
孔臻
王乐
邓国栋
王兵
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Zhengzhou Tobacco Research Institute of CNTC
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Zhengzhou Tobacco Research Institute of CNTC
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G43/00—Control devices, e.g. for safety, warning or fault-correcting
    • B65G43/08—Control devices operated by article or material being fed, conveyed or discharged
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
    • A24B3/00—Preparing tobacco in the factory
    • A24B3/08—Blending tobacco
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
    • A24B3/00—Preparing tobacco in the factory
    • A24B3/12—Steaming, curing, or flavouring tobacco
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/86—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G2203/00—Indexing code relating to control or detection of the articles or the load carriers during conveying
    • B65G2203/02—Control or detection
    • B65G2203/0266—Control or detection relating to the load carrier(s)
    • B65G2203/0291—Speed of the load carrier

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Manufacturing Of Cigar And Cigarette Tobacco (AREA)
  • Flow Control (AREA)

Abstract

一种基于激光扫描的烟草物料质量流量的测控方法，其特征在于，其方法通过激光扫描获取烟草物料的实时高度信息，通过时间维度上的积分，获得瞬时体积流量；通过离线标定烟草物料的不同堆放高度下的密度拟合图线，获取瞬时质量流量；通过PID控制，瞬时质量流量与恒定质量流量的差值作为脉冲信号，对皮带电机控制，达到单位时间下的质量流量的稳定。

Figure 202110203119

A method for measuring and controlling the mass flow of tobacco materials based on laser scanning, characterized in that the method obtains real-time height information of tobacco materials through laser scanning, and obtains instantaneous volume flow through integration in the time dimension; The density fitting graph at the stacking height is used to obtain the instantaneous mass flow; through PID control, the difference between the instantaneous mass flow and the constant mass flow is used as a pulse signal to control the belt motor to achieve the stability of the mass flow per unit time.

Figure 202110203119

Description

Tobacco material mass flow measurement and control method based on laser scanning
Technical Field
The invention relates to the technical field of tobacco processing, in particular to a method for measuring and controlling the mass flow of tobacco materials based on laser scanning.
Background
In the tobacco industry, under a plurality of different processing and production procedures, the processes of conveying, blending, flavoring and feeding tobacco materials under different flow rates are involved. In the process, the flow detection and the flow control of the tobacco materials influence the production stability and the product quality stability. In the existing technology, each production enterprise uses a mode of combining a numerical control feeding machine and a belt weigher to control the mass flow of tobacco materials before the tobacco materials fall on a shifting and rolling device.
However, after the material really falls on the belt, the uniformity of the tobacco material is affected by the formed different spatial distribution states, the randomness is too strong, and the dispersion degree is too high, so that the subsequent flavoring and feeding processes and the blending process with other tobacco materials are seriously affected.
Disclosure of Invention
In order to overcome the existing defects, the invention provides a tobacco material mass flow measurement and control method based on laser scanning.
A method for measuring and controlling the mass flow of tobacco materials based on laser scanning comprises the steps of obtaining real-time height information of the tobacco materials through laser scanning, and obtaining instantaneous volume flow through integration in a time dimension; obtaining instantaneous mass flow by off-line calibrating density fitting graphs of the tobacco materials at different stacking heights; through PID control, the difference value of the instantaneous mass flow and the constant mass flow is used as a pulse signal to control a belt motor to achieve the stability of the mass flow under unit time, and the method comprises the following steps
1. Acquiring tobacco material volume flow information;
2. off-line density fitting of tobacco materials;
3. acquiring tobacco material mass flow information;
4. and controlling the mass flow of the tobacco material.
Wherein, the flow information of the tobacco material is obtained by an equation,
Figure BDA0002948025580000021
in the formula, VallThe volume of the material in the sampling time period, v is the running speed of the material, T is the sampling time, i is the ith scanning line, alpha is the scanning angle range, alphapTo angular resolution, LiIs the ith scan line length, L'iIs the ith scan line baseline length. Length (taken by the laser sensor in the unloaded condition).
The method comprises the steps of scanning acquisition time T of materials through a laser to obtain current flow state information, and combining the current flow state information with density fitting curves of tobacco materials under different stacking heights to obtain mass flow in sampling time.
Wherein, the tobacco material is subjected to off-line density fitting, the density of the tobacco material at any height is obtained through an equation,
Figure BDA0002948025580000022
wherein, when the height x is less than a certain value xmThen, the density is not changed any more, the stable value is m, when the height x is larger than a certain value xnThen, the density is not changed any more, the stable value is n, and when the height x is larger than xmLess than xnWhen the temperature of the water is higher than the set temperature,
Figure BDA0002948025580000023
the density of the tobacco materials with different heights can be changed under the condition of stacking, so that the density values corresponding to a plurality of different heights are measured under an off-line state, and the density of the tobacco materials with any height is obtained by a least square fitting function method.
Wherein, the mass flow is obtained by the flow information of the tobacco material in the step 1 and the density of the tobacco material in the step 2 through a formula,
Figure BDA0002948025580000024
wherein M is the mass flow rate in the sampling time in step 1, VallThe volume flow in the sampling time in step 1, i is the number of samples in the sampling time.
And 3, comparing the mass flow rate obtained in the step 3 in unit sampling time with the constant mass flow rate on the belt weigher required by actual production, sending the difference value into a PID (proportion integration differentiation) controller as a pulse, and controlling the rotating speed of a motor by a PLC (programmable logic controller) to change the mass flow rate state of the tobacco material.
The patent provides a method for measuring and controlling the conveying mass flow of tobacco materials on a belt based on laser scanning, wherein the real-time height information of the tobacco materials is obtained through the laser scanning, and the instantaneous volume flow is obtained through integration in a time dimension; obtaining instantaneous mass flow by off-line calibrating density fitting graphs of the tobacco materials at different stacking heights; through PID control, the difference value of the instantaneous mass flow and the constant mass flow is used as a pulse signal to control a belt motor, so that the mass flow under unit time is stable.
Drawings
Fig. 1 is a schematic flow chart of a measurement and control method.
Fig. 2 is a schematic diagram of a tobacco material mass flow measurement and control device based on laser scanning.
FIG. 3 is a density distribution diagram of different tobacco shred stacking heights in the embodiment.
Detailed Description
The following describes in detail a method for measuring and controlling the mass flow of tobacco material based on laser scanning according to the present invention with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, a method for measuring and controlling the mass flow of a tobacco material based on laser scanning includes obtaining real-time height information of the tobacco material through laser scanning, and obtaining instantaneous volume flow through integration in a time dimension; obtaining instantaneous mass flow by off-line calibrating density fitting graphs of the tobacco materials at different stacking heights; through PID control, the difference value of the instantaneous mass flow and the constant mass flow is used as a pulse signal to control a belt motor to achieve the stability of the mass flow under unit time, and the method comprises the following steps
1. Acquiring tobacco material volume flow information;
2. off-line density fitting of tobacco materials;
3. acquiring tobacco material mass flow information;
4. and controlling the mass flow of the tobacco material.
Obtaining the flow information of the tobacco material through an equation,
Figure BDA0002948025580000041
in the formula, VallThe volume of the material in the sampling time period, v is the running speed of the material, T is the sampling time, i is the ith scanning line, alpha is the scanning angle range, alphapTo angular resolution, LiIs the ith scan line length, L'iIs the ith scan line baseline length.
Off-line density fitting of the tobacco material, obtaining the density of the tobacco material at any height through an equation,
Figure BDA0002948025580000042
wherein, when the height x is less than a certain value xmThen, the density is not changed any more, the stable value is m, when the height x is larger than a certain value xnThen, the density is not changed any more, the stable value is n, and when the height x is larger than xmLess than xnWhen the temperature of the water is higher than the set temperature,
Figure BDA0002948025580000043
obtaining the mass flow through the tobacco material flow information in the step 1 and the tobacco material density in the step 2 by a formula,
Figure BDA0002948025580000044
wherein M is the mass flow rate in the sampling time in step 1, VallThe volume flow in the sampling time in step 1, i is the number of samples in the sampling time.
Comparing the mass flow rate of the tobacco material in unit sampling time obtained in the step 3 with the constant mass flow rate of the belt weigher required by actual production, sending the difference value into a PID (proportion integration differentiation) controller as a pulse, and controlling the rotating speed of a motor through a PLC (programmable logic controller) to change the mass flow rate state of the tobacco material
Fig. 2 shows that a measuring and controlling device for tobacco material mass flow based on laser scanning comprises a linear laser scanner 2, a motor frequency converter 7, an information acquisition card 6, a programmable controller, an information processing computer 5 and a variable frequency motor. The linear laser scanner is used for collecting profile information (namely height information) of the material 1; the motor frequency converter 7 is used for controlling the stepping motor and simultaneously sending the information of the instantaneous motor rotating speed into the information acquisition card 6; the information acquisition card 6 is used for acquiring speed signals and height signals of the laser scanner and sending original information into the information processing computer 5 for subsequent processing; the information processing computer 5 is used for carrying out data processing on the acquired information to obtain the surface profile and the instantaneous mass flow of the tobacco material and sending a signal to the programmable controller; the programmable controller obtains the mass flow signal of the computer, and sends different pulse signals to the motor frequency converter 7 through the programmable controller so as to control the rotating speed of the motor, thereby controlling the rotating speed of the belt to ensure stable blanking.
In one embodiment, the length of the conveyor belt 4 is selected to be about 20m, the width is selected to be 0.9m, and the height is selected to be 0.4 m. The frequency of the variable frequency motor is set to 10Hz, and the conveying speed of the measuring belt is about 0.6 m/s. The linear laser scanner 2 was placed approximately 1.2m above the very center of the conveyor belt with a frequency set at 25Hz, a scan angle of 70-110 ° and an angular resolution of 0.25 °. The user can adjust to reasonable value according to the equipment parameter.
1. Obtaining tobacco material volume flow information
During the steady state movement of the conveyor belt, the formula
Figure BDA0002948025580000051
The total volume in the sampling time is obtained, and the volume flow rate per sampling time can be obtained.
2. Off-line density fitting of tobacco material
As shown in FIG. 3, the density of tobacco material at different height levels is determined off-line and calculated according to the formula
Figure BDA0002948025580000052
Obtaining a density fitting curve:
Figure BDA0002948025580000053
unit is kg/m3。
3. Obtaining tobacco material mass flow information
According to the formula
Figure BDA0002948025580000054
Substituting different sampling height values into the function obtained by fitting in the step 2, solving the density of the tobacco material at different positions, and solving the average value to obtain the mass flow rate in unit sampling time.
4. Controlling tobacco material mass flow
After the mass flow is obtained, the mass flow is compared with the constant mass flow required by actual production, namely, on the belt weigher, the difference value is sent to the PID controller as a pulse, and the mass flow state of the tobacco material is changed by controlling the rotating speed of the motor through the PLC.
As shown in the flow chart of fig. 1, the programmable controller is encoded to teach the PID to a reasonable parameter.
Finally, it should be noted that the above examples are only intended to describe the technical solutions of the present invention and not to limit the technical methods, the present invention can be extended in application to other modifications, variations, applications and embodiments, and therefore all such modifications, variations, applications, embodiments are considered to be within the spirit and teaching scope of the present invention.

Claims (5)

1.一种基于激光扫描的烟草物料质量流量的测控方法，其特征在于，其方法通过激光扫描获取烟草物料的实时高度信息，通过时间维度上的积分，获得瞬时体积流量；通过离线标定烟草物料的不同堆放高度下的密度拟合图线，获取瞬时质量流量；通过PID控制，瞬时质量流量与恒定质量流量的差值作为脉冲信号，对皮带电机控制，达到单位时间下的质量流量的稳定，所述方法的步骤为1. a method for measuring and controlling the mass flow of tobacco material based on laser scanning, is characterized in that, its method obtains the real-time height information of tobacco material by laser scanning, by integration on time dimension, obtains instantaneous volume flow; By off-line calibration tobacco material The density fitting graph at different stacking heights is obtained to obtain the instantaneous mass flow; through PID control, the difference between the instantaneous mass flow and the constant mass flow is used as a pulse signal to control the belt motor to achieve the stability of the mass flow per unit time, The steps of the method are 1.获取烟草物料体积流量信息；1. Obtain the volume flow information of tobacco material; 2.烟草物料离线密度拟合；2. Offline density fitting of tobacco materials; 3.获取烟草物料质量流量信息；3. Obtain tobacco material mass flow information; 4.控制烟草物料质量流量。4. Control the mass flow of tobacco material. 2.根据权利要求1所述的基于激光扫描的烟草物料质量流量的测控方法，其特征在于，通过方程式获取烟草物料流量信息，2. the measurement and control method of the tobacco material mass flow based on laser scanning according to claim 1, is characterized in that, obtains tobacco material flow information by equation,
Figure FDA0002948025570000011
Figure FDA0002948025570000011
 式中，Vall为取样时间段内物料体积，v为物料运行速度，T为取样时间，i为第i条扫描线，α为扫描角度范围，αp为角度分辨率，Li为第i条扫描线长度，L′i为第i条扫描线基线长度。In the formula, V all is the material volume in the sampling time period, v is the material running speed, T is the sampling time, i is the ith scanning line, α is the scanning angle range, α p is the angular resolution, and Li is the ith scanning line. is the length of the scan line, and L′ i is the base line length of the ith scan line. 3.根据权利要求1所述的基于激光扫描的烟草物料质量流量的测控方法，其特征在于，所述烟草物料离线密度拟合，通过方程式获取任意高度下的烟草物料密度，3. the measurement and control method of the tobacco material mass flow rate based on laser scanning according to claim 1, is characterized in that, described tobacco material off-line density fitting, obtains the tobacco material density under any height by equation,
Figure FDA0002948025570000012
Figure FDA0002948025570000012
 式中，当高度x小于某个值xm后，其密度不再发生变化，稳定值为m，当高度x大于某个值xn后，其密度不再发生变化，稳定值为n，当高度x大于xm小于xn时，
Figure FDA0002948025570000021
In the formula, when the height x is less than a certain value x m , its density will no longer change, the stable value is m, when the height x is greater than a certain value x n , its density will no longer change, the stable value is n, when When the height x is greater than x m and less than x n ,
Figure FDA0002948025570000021
 4.根据权利要求1所述的基于激光扫描的烟草物料质量流量的测控方法，其特征在于，通过步骤1烟草物料流量信息和步骤2烟草物料密度通过公式得到质量流量，4. the measurement and control method of the tobacco material mass flow based on laser scanning according to claim 1, is characterized in that, obtains mass flow by formula by step 1 tobacco material flow information and step 2 tobacco material density,
Figure FDA0002948025570000022
Figure FDA0002948025570000022
 式中，M为步骤1中取样时间内的质量流量，Vall为步骤1中取样时间内的体积流量，i为取样时间内取样的数量。In the formula, M is the mass flow rate in the sampling time in step 1, V all is the volume flow rate in the sampling time in step 1, and i is the number of samples in the sampling time. 5.根据权利要求1所述的基于激光扫描的烟草物料质量流量的测控方法，其特征在于，由步骤3获得的单位取样时间下的质量流量，与实际生产所需皮带秤上的恒定质量流量对比，差值作为脉冲送入PID控制器，通过PLC控制电机转速改变烟草物料质量流量状态。5. the measurement and control method of the tobacco material mass flow based on laser scanning according to claim 1, is characterized in that, the mass flow under the unit sampling time obtained by step 3, and the constant mass flow on the belt scale required for actual production In contrast, the difference value is sent to the PID controller as a pulse, and the motor speed is controlled by the PLC to change the mass flow state of the tobacco material.
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Cited By (5)

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Publication number Priority date Publication date Assignee Title
CN114212452A (en) * 2021-11-05 2022-03-22 中国矿业大学 Coal flow detection method based on laser assistance and image processing and energy-saving control system
CN115893041A (en) * 2022-10-26 2023-04-04 华能(浙江)能源开发有限公司玉环分公司 3D lidar-based collaborative control system for ship unloader flow monitoring
CN116076780A (en) * 2023-03-01 2023-05-09 中国烟草总公司郑州烟草研究院 Real-time measurement method and real-time regulation and control method for cut tobacco proportion of cigarette making machine
CN116210956A (en) * 2023-03-01 2023-06-06 中国烟草总公司郑州烟草研究院 Real-time Measuring Device for Ratio of Recycled Silk in Cigarette Making Machine
CN117699402A (en) * 2023-12-21 2024-03-15 秦皇岛烟草机械有限责任公司 Control method and control device for material flow of wire making line

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114212452A (en) * 2021-11-05 2022-03-22 中国矿业大学 Coal flow detection method based on laser assistance and image processing and energy-saving control system
CN115893041A (en) * 2022-10-26 2023-04-04 华能(浙江)能源开发有限公司玉环分公司 3D lidar-based collaborative control system for ship unloader flow monitoring
CN116076780A (en) * 2023-03-01 2023-05-09 中国烟草总公司郑州烟草研究院 Real-time measurement method and real-time regulation and control method for cut tobacco proportion of cigarette making machine
CN116210956A (en) * 2023-03-01 2023-06-06 中国烟草总公司郑州烟草研究院 Real-time Measuring Device for Ratio of Recycled Silk in Cigarette Making Machine
CN117699402A (en) * 2023-12-21 2024-03-15 秦皇岛烟草机械有限责任公司 Control method and control device for material flow of wire making line

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Application publication date: 20210622