阅读说明：本技术 一种输送带上烟丝物料堆积密度的在线检测方法 (The online test method of pipe tobacco material accumulation density on a kind of conveyer belt ) 是由 李斌 鲁端峰 黄锋 王乐 张柯 于 2019-09-24 设计创作，主要内容包括：本发明涉及一种输送带上烟丝物料堆积密度的在线检测方法,其特征在于：是通过烟丝物料体积流量检测系统对输送带上的烟丝物料流量进行实时检测得出在测量时间T内通过的烟丝体积流量Q、以及通过在线皮带称重系统对输送带上的烟丝物料进行实时称重得出在检测时间T内的烟丝质量M,通过质量与体积的比值,获得测量时间T内的烟丝物料堆积密度。本发明的特点在于：所用设备安全、方便,方法原理可靠实用,利用电子在线皮带称重系统与光学检测系统连用在线检测输送带上烟丝堆积密度是可行的,使用此方法可方便快速地测定烟丝物料的堆积密度,对于实现在线检测烟丝物料填充性能质量稳定性及质量的波动情况,指导卷烟制丝及卷接工艺调控具有重要意义。(The present invention relates to a kind of online test methods of pipe tobacco material accumulation density on conveyer belt, it is characterized by: being to be measured in real time the tobacco quality M for obtaining the pipe tobacco volume flow Q passed through in time of measuring T and carrying out by online belt weighing system to the pipe tobacco material on conveyer belt between weighing obtains when detecting in real time in T to the pipe tobacco mass flow on conveyer belt by pipe tobacco volume of material flow quantity detecting system, by the ratio of quality and volume, the pipe tobacco material accumulation density in time of measuring T is obtained.Present invention is characterized in that device therefor is conveniently, safely, Method And Principle is reliable and practical, it is feasible that pipe tobacco bulk density on on-line checking conveyer belt, which is used in conjunction, with Systems for optical inspection using the online belt weighing system of electronics, the bulk density of pipe tobacco material can be quickly and easily measured using the method, for realizing the fluctuation situation of on-line checking pipe tobacco material filling capacity quality stability and quality, cigarette primary processing and cigarette process control is instructed to be of great significance.)

1. the online test method of pipe tobacco material accumulation density on a kind of conveyer belt, it is characterised in that: be by pipe tobacco material body Product flow quantity detecting system is measured in real time the pipe tobacco for obtaining and passing through in time of measuring T to the pipe tobacco mass flow on conveyer belt It volume flow Q and weighing in real time is carried out to the pipe tobacco material on conveyer belt by online belt weighing system obtains and is detecting Tobacco quality M in time T obtains the pipe tobacco material accumulation density p b in time of measuring T by the ratio of quality and volume:

The pipe tobacco volume of material flow quantity detecting system includes light-field camera, linear laser, velocity sensor and information processing Computer composition, light-field camera are used to acquire the field information of pipe tobacco particle to realize that pipe tobacco height detecting, Linear Laser device are used The accuracy of measurement is improved in enhancing pipe tobacco particle surface texture；Velocity sensor is to real-time measurement conveying tape travel speed Degree；Information processing computer is used to receive the signal of light-field camera and velocity sensor transmission, carries out to the field information of acquisition Data processing obtains pipe tobacco depth of section, and the volume flow of pipe tobacco is calculated according to the speed of conveyer belt；

The online belt weighing system is that production line is original or newly-increased weighing belt, and light-field camera and linear laser are installed on In conveyor belt after line weighing belt, weighing system is weighed in real time exports weight.

2. the online test method of pipe tobacco material accumulation density on conveyer belt according to claim 1, it is characterised in that: packet Include following steps:

1) the online volume flow of pipe tobacco material on conveyer belt is measured by optical field imaging,

Light-field camera and Linear Laser device are installed above pipe tobacco material conveyor belt, and the two is perpendicularly oriented to lower section pipe tobacco object Material, Linear Laser device are used to acquire the field information of pipe tobacco particle for enhancing pipe tobacco particle surface texture, light-field camera with reality Existing pipe tobacco height detecting；Velocity sensor is installed at conveyor wheel, to real-time measurement conveyer belt forward speed；Information Processing computer is used to receive the signal of light-field camera and velocity sensor transmission, carries out data processing to the field information of acquisition Instantaneous pipe tobacco depth of section is obtained, and the volume flow of pipe tobacco is calculated according to the speed of conveyer belt, concrete scheme is as follows

(1) by light-field camera acquisition field information with four-dimension light field function L (u, v, x, y) expression, with two groups of coordinates (u, v), (x, y) records the direction per a branch of light into camera, wherein coordinate (u, v) in the microlens array surface in light-field camera For recording the position for the lenticule being incident on, the coordinate (x, y) recorded in the CCD plane in light-field camera is for indicating incident The geometric position of light arrival pixel；

(2) visualized operation is carried out to the four-dimensional field information of light-field camera acquisition, passes through fixed u=u^*, x=x^*, for u^* V width image under column lenticule extracts xth^*Column pixel is simultaneously permutated and combined as polar plane image by sequence from left to rightIt is shown below,

(3) by carrying out edge detection to polar plane image, straight-line detection is then carried out, obtains texture line slope, wherein pass through Edge detection operator detects the grain in polar plane image, carries out straight line inspection using Hough transformation (Hough Transform) It surveys, and obtains grain slope k.Edge detection operator uses Sobel isotropism operator, the expression formula of horizontal and vertical operator It is respectively as follows:

(4) texture depth calculates.First by principle of triangulation, calculates measurand and invent image planes to image detector CCD Distance:

In formula, l_{MLA, CCD}The distance between image detector, l are arrived for microlens array_pFor single pixel size, d is that lenticule is straight Diameter,

Then invent image planes to main lens distance are as follows:

l_s',ML=l_ML,CCD-l_s',CCD

In formula, l_{ML, CCD}For the distance of main lens to image detector.

Therefore according to lens imaging formula, the distance of measurand to main lens are as follows:

In formula, f is the main focal length of lens, is obtaining distance l of the measurand to main lens_{O, ML}Later, it is in place to select baseline zero point institute It sets, obtains measurand height h；

(5) data processing is carried out to acquired pipe tobacco surface optical field image and pipe tobacco surface height map h (x, y) is calculated, in y Direction takes mean value, obtains pipe tobacco depth of section curve H (x).

Pipe tobacco depth of section:

In formula, Y is laser irradiation bandwidth；

(6) to the pipe tobacco depth of section H being calculated_iIt is filtered, Function Fitting operation, the distribution of its height is made to be more in line with cigarette Silk is scattered rule.Wherein, Function Fitting is fitted using Fourier space, and Filtering Formula is

(7) conveyor width is set as X, is H (x, t) in the instantaneous depth of section of t moment pipe tobacco, belt speed measurement sensor obtains The instantaneous forward speed v (t) of pipe tobacco calculates pipe tobacco volume flow Q.

Pipe tobacco sectional area are as follows:

Pipe tobacco instantaneous volume flow rate is Q (t):

Q (t)=S (t) v (t)

In time of measuring T, volume flow Q that pipe tobacco passes through:

2) online tobacco quality, is read by online belt weighing system,

Belt weighing system is that production line is original or newly-increased weighing belt, and light-field camera and linear laser are installed on online weighing belt In conveyor belt later, belt weighing system is weighed in real time exports weight, the belt balance weighing gantry in belt weighing system It is installed in conveying frame, when material passes through, metering carrying roller detects that the weight of material of weighing belt passes through leverage in title Sensor is retransmitted, the voltage signal for being proportional to belt load is generated, records the tobacco quality M passed through in time of measuring T:

3), in conjunction with distance and belt rate between weighing belt weight detecting point and volume flow test point, the two data pair are obtained The pipe tobacco lag time difference △ t answered obtains pipe tobacco material and synchronizes corresponding instantaneous volume flow rate Q (t) and instantaneous mass flow M (t)；

4), according to pipe tobacco material particles degree demand for control, by the ratio of quality and volume, customized time quantum T (or object is obtained Doses) pipe tobacco bulk density.

Mass M in time of measuring T is obtained into bulk density ρ b compared with volume flow Q:

3. the online test method of pipe tobacco material accumulation density on conveyer belt of any of claims 1 or 2, it is characterised in that: institute Stating its spot diameter of linear laser is 0.1mm, and laser stimulating frequency is higher than 1000Hz.

4. the online test method of pipe tobacco material accumulation density on conveyer belt of any of claims 1 or 2, it is characterised in that: institute Stating online belt weighing system is belted electronic balance.

Technical field

The invention belongs to tobacco process detection technique fields, and in particular to pipe tobacco material accumulation density on a kind of conveyer belt Online test method.

Background technique

In the throwing before cigarette cigarette and mix in flavoring process procedure, pipe tobacco (including cut tobacco, expansive cut tobacco, thin slice Silk cuts filler) Filling power is an important physical detection index.Tobacco fill value refers to the pipe tobacco of Unit Weight one Under constant-pressure, by the volume kept after a certain period of time.The quality of the filling capacity of pipe tobacco and cigarette, cigarette list case consumption silk amount, Tar content has close relationship, has a major impact to the main flume chemical index and sense organ inherent quality of cigarette.Currently, The measurement of tobacco leaf production enterprise tobacco fill value is mostly using the professional standard " survey of YC/T152-2001 cigarette shreds Filling power It is fixed " and " measurement of YC/T163-2003 cigarette expansion stem filling rate ", it is measured by artificial sampling static method, and this method Sampling proportion is low, data discrete is big, cannot accurately reflect the Filling power of pipe tobacco and variation by the gross.

Patent ZL200310121802.X and ZL200510086912.6 are individually disclosed to be carried out using gamma-rays and X-ray The method and apparatus that line measures tobacco fill value, but above method characterization processes are complicated, and in protection safety and accuracy There are problems.Patent No. ZL201210000176.8 discloses a kind of using weight method, passes through weight or its variable quantity and list Corresponding relationship between the volume of position, the method for carrying out on-line measurement tobacco fill value, but in the actual process, unit time pipe tobacco Volume flow itself is a uncontrollable variable, above-mentioned measurement method cannot preferably reflect pipe tobacco Filling power become Change.Patent CN201710163715.2 discloses the equal value measurement method of tobacco fill value in a kind of container, and this method is to fill cabinet weight The bulk density that amount and volume obtain cabinet batch carries out data conversion and obtains Filling power, and is modified by establishing model, but This method is as unit of cabinet, and not only detection process information is few, and it is uneven to accumulate lower internal density itself for pipe tobacco under the big scale of construction.Heap Product density is the weight of pipe tobacco in unit volume, compares above-mentioned Filling power definition, and Filling power is reciprocal relation.Above-mentioned measurement Method is that the bulk density data conversion of measurement is obtained Filling power, and and industry standard methods based on application certain platen pressure Certain modeling amendment is carried out, but Filling power is a comprehensive apparent value, moisture, the formula composition, chemical component of it and pipe tobacco And tobacco structure has relationship, simple Modifying model is inaccurate, it is difficult to be promoted.

Therefore, during on-line checking, accurately measuring its bulk density has more direct application value, can be more direct Reflect and is associated with variation caused by technology for making tobacco threds process, and the influence to cigarette quality.So how accurately to measure cigarette online The bulk density of silk, becomes this field technical problem urgently to be resolved.

Summary of the invention

The technical problem to be solved by the present invention is in view of the deficiency of the prior art, provide on a kind of conveyer belt The method of on-line determination pipe tobacco bulk density.Meaning of the present invention is the provision of a kind of device therefor conveniently, safely, and method is former The method of on-line determination pipe tobacco bulk density on the reliable and practical conveyer belt of reason.It is realized using laser light field technology in line volume Flow real-time and accurate measurement, belted electronic balance realize mass flow real-time and accurate measurement, obtain the heap of customized inventory particle Product density, realizes the fluctuation situation of on-line checking pipe tobacco material filling capacity quality stability and quality, instruct cigarette primary processing and Cigarette technique real-time monitoring.

To achieve the above object, the invention provides the following technical scheme:

The online test method of pipe tobacco material accumulation density, is by pipe tobacco volume of material flow detection on a kind of conveyer belt System the pipe tobacco mass flow on conveyer belt is measured in real time obtain the pipe tobacco volume flow Q passed through in time of measuring T, And cigarette between weighing obtains when detecting in real time in T is carried out to the pipe tobacco material on conveyer belt by online belt weighing system Yarn quality M obtains the pipe tobacco material accumulation density p b in time of measuring T by the ratio of quality and volume:

The pipe tobacco volume of material flow quantity detecting system includes light-field camera, linear laser, velocity sensor and information Computer composition is handled, light-field camera is used to acquire the field information of pipe tobacco particle to realize pipe tobacco height detecting, Linear Laser Device is for enhancing pipe tobacco particle surface texture to improve the accuracy of measurement；Velocity sensor conveys tape travel to real-time measurement Speed；Information processing computer is used to receive the signal of light-field camera and velocity sensor transmission, to the field information of acquisition into Row data processing obtains pipe tobacco depth of section, and the volume flow of pipe tobacco is calculated according to the speed of conveyer belt；

The online belt weighing system is that production line is original or newly-increased weighing belt, light-field camera and linear laser installation In conveyor belt after online belted electronic balance, between the two (i.e. between weighing belt and conveyor belt) without mixing equipment, Weighing system is weighed in real time exports weight.

The present invention specifically includes the following steps:

1, the online volume flow of pipe tobacco material on conveyer belt is measured by optical field imaging.

Light-field camera and Linear Laser device are installed above pipe tobacco material conveyor belt, Linear Laser device enhances pipe tobacco particle table Face texture, light-field camera acquire the field information of pipe tobacco particle to realize pipe tobacco height detecting；It is equipped at conveyor wheel Velocity sensor, to real-time measurement conveyer belt forward speed；Light-field camera is received using information processing computer and speed passes The signal of sensor transmission carries out data processing to the field information of acquisition and obtains instantaneous pipe tobacco depth of section, and according to conveyer belt Speed the volume flow of pipe tobacco is calculated.

(1) by light-field camera acquisition field information with four-dimension light field function L (u, v, x, y) expression, with two groups of coordinates (u, V), (x, y) records the direction per a branch of light into camera.Wherein, coordinate in the microlens array surface in light-field camera (u, V) for record the position of the lenticule being incident on, the coordinate (x, y) recorded in the CCD plane in light-field camera be used to indicate into Penetrate the geometric position that light reaches pixel；

(2) visualized operation is carried out to the four-dimensional field information of light-field camera acquisition.Pass through fixed u=u^*, x=x^*, for U^*V width image under column lenticule extracts xth^*Column pixel is simultaneously permutated and combined as polar plane image by sequence from left to rightIt is shown below,

(3) by polar plane image carry out edge detection (i.e. using edge detection algorithm to the grain in image into Row edge detection), straight-line detection is then carried out, texture line slope is obtained.Wherein, polar plane figure is detected by edge detection operator Grain as in carries out straight-line detection using Hough transformation (Hough Transform), and obtains grain slope k.Edge Detective operators use Sobel isotropism operator, and the expression formula of horizontal and vertical operator is respectively as follows:

(4) texture depth calculates.First by principle of triangulation, calculates measurand and invent image planes to image detector The distance of CCD:

In formula, l_{MLA, CCD}The distance between image detector, l are arrived for microlens array_pFor single pixel size, d is micro- Mirror diameter.

Then invent image planes to main lens distance are as follows:

l_s',ML=l_ML,CCD-l_s',CCD

In formula, l_{ML, CCD}For the distance of main lens to image detector.

Therefore according to lens imaging formula, the distance of measurand to main lens are as follows:

In formula, f is the main focal length of lens, is obtaining distance l of the measurand to main lens_{O, ML}Later, baseline zero point is selected (it is exactly reference position point, is set as zero) position similar to sea level altitude, obtain measurand height h.

(5) to acquired pipe tobacco surface optical field image carry out data processing be calculated pipe tobacco surface height map h (x, y).Mean value is taken in the direction y, obtains pipe tobacco depth of section curve H (x).

Pipe tobacco depth of section:

In formula, Y is laser irradiation bandwidth；

(6) to the pipe tobacco depth of section H being calculated_iIt is filtered, Function Fitting operation, accords with the distribution of its height more Pipe tobacco is closed to be scattered rule.Wherein, Function Fitting is fitted using Fourier space, and Filtering Formula is

(7) conveyor width is set as X, is H (x, t), belt speed measurement sensor in the instantaneous depth of section of t moment pipe tobacco The instantaneous forward speed v (t) of pipe tobacco is obtained, pipe tobacco volume flow Q is calculated.

Pipe tobacco sectional area are as follows:

Pipe tobacco instantaneous volume flow rate is Q (t):

Q (t)=S (t) v (t)

In time of measuring T, volume flow Q that pipe tobacco passes through:

2, online tobacco quality is read by online belt weighing system,

Belt weighing system is that production line is original or newly-increased weighing belt, and light-field camera and linear laser are installed on online electricity In conveyor belt after sub- weighing belt, between the two without mixing equipment.Belt weighing system is weighed in real time exports weight.Electronics Belt balance weighing gantry is installed in conveying frame, and when material passes through, metering carrying roller detects that the weight of material of weighing belt is logical Leverage is crossed in weighing sensor, the voltage signal for being proportional to belt load is generated, passes through in record time of measuring T Tobacco quality M:

3, in conjunction with distance and belt rate between weighing belt weight detecting point and volume flow test point, the two data are obtained Corresponding pipe tobacco lag time difference △ t obtains pipe tobacco material and synchronizes corresponding instantaneous volume flow rate Q (t) and instantaneous mass flow M (t)；

4, customized time quantum T is obtained by the ratio of quality and volume according to pipe tobacco material particles degree demand for control The pipe tobacco bulk density of (or inventory).

Mass M in time of measuring T is obtained into bulk density ρ b compared with volume flow Q:

The present invention has the advantages that provide a kind of device therefor conveniently, safely, Method And Principle is reliably and practical conveying The method for taking on-line determination pipe tobacco bulk density.Online volume flow real-time and accurate measurement is realized using laser light field technology, Belted electronic balance realizes mass flow real-time and accurate measurement, obtains the bulk density of customized inventory particle, realizes online inspection The fluctuation situation for surveying pipe tobacco material filling capacity quality stability and quality, instructs cigarette primary processing and cigarette technique real-time monitoring.

Detailed description of the invention

Fig. 1 is the on-line measuring device figure of pipe tobacco material accumulation density on conveyer belt used in this patent；

Serial number in Fig. 1 are as follows: 1, pipe tobacco material；2, (spot diameter 0.1mm, laser stimulating frequency are high for Linear Laser device In 1000Hz)；3, light-field camera；4, conveyer belt；5, information processing computer；6, material cross section；7, velocity sensor；8, claim Weight instrument；9, carrying roller is measured.

Fig. 2 light field four-dimensional information characterizes schematic diagram；Wherein a is that light propagates schematic diagram, b after point light source enters light-field camera Schematic diagram is spread for the light field point of point light source；

Fig. 3 is polar plane image schematic diagram；

Fig. 4 is pipe tobacco height measurement results and true altitude comparison diagram；

Fig. 5 pipe tobacco bulk density on-line measurement operation schematic diagram.

Specific embodiment

The present invention is described further below in conjunction with attached drawing:

1, the online volume flow of pipe tobacco material on conveyer belt is measured by optical field imaging.

Light-field camera and Linear Laser device, the enhancing of Linear Laser device are installed above pipe tobacco material conveyor belt as shown in Figure 1 Pipe tobacco particle surface texture, light-field camera acquire the field information of pipe tobacco particle to realize pipe tobacco height detecting；It is rolled in conveyer belt Velocity sensor is installed, to real-time measurement conveyer belt forward speed at wheel；Light field phase is received using information processing computer The signal of machine and velocity sensor transmission carries out data processing to the field information of acquisition and obtains instantaneous pipe tobacco depth of section, and The volume flow of pipe tobacco is calculated according to the speed of conveyer belt；

(1) field information of light-field camera acquisition can be indicated with four-dimension light field function L (u, v, x, y), as shown in Fig. 2 (a), The direction per a branch of light into camera is recorded with two groups of coordinates (u, v), (x, y).Wherein, coordinate in microlens array surface (u, v) is used to record the position for the lenticule being incident on, and the coordinate (x, y) recorded in CCD plane is for indicating that incident ray arrives Up to the geometric position of pixel, Fig. 2 (b) gives the original light field image example for recording four-dimensional field information, wraps in this example Containing 3 × 3 lenticules, the pixel number of the covering under each lenticule is 5 × 5；

(2) visualized operation is carried out to the four-dimensional field information of light-field camera acquisition, light field visualization, which refers to, fixes two Four-dimensional light field is projected as two dimensional image, to observe light field by dimension.Pass through fixed u=u^*, x=x^*, for u^* V width image under column lenticule extracts xth^*Column pixel is simultaneously permutated and combined as polar plane image by sequence from left to rightProcess is shown below.

By taking dotted portion in Fig. 2 (b) as an example, the 3rd row pixel of pixel will be covered under each lenticule of the 2nd column lenticule It successively extracts, from left to right arranges, obtained polar plane image E_2,3(v, y) was as shown in figure 3, both included the space of light in Fig. 3 Information, also includes the angle information of light, and the slope k of grain (fill color region in Fig. 3) can map out the depth of the point Spend information；

(3) by carrying out edge detection to polar plane image shown in Fig. 3, straight-line detection is then carried out, it is oblique to obtain grain Rate, method are: detecting the grain in polar plane image by edge detection operator first, wherein edge detection operator is adopted With Sobel isotropism operator, including lateral operator S_xWith longitudinal operator S_y, expression formula are as follows:

After obtaining edge, straight line is detected using Hough transformation (Hough Transform), and obtain grain slope k；

(4) texture depth calculates.First by principle of triangulation, calculates measurand and invent image planes to image detector The distance of CCD:

In formula, l_{MLA, CCD}The distance between image detector, l are arrived for microlens array_pFor single pixel size, d is micro- Mirror diameter.

Then invent image planes to main lens distance are as follows:

l_s',ML=l_ML,CCD-l_s',CCD

In formula, l_{ML, CCD}For the distance of main lens to image detector.

Therefore according to lens imaging formula, the distance of measurand to main lens are as follows:

In formula, f is the main focal length of lens, is obtaining distance l of the measurand to main lens_{O, ML}Later, height zero point is selected Position obtains measurand height h；

(5) to acquired pipe tobacco surface optical field image carry out data processing be calculated pipe tobacco surface height map h (x, y).Mean value is taken in the direction y, obtains pipe tobacco depth of section curve H (x).

Pipe tobacco depth of section:

In formula, Y is laser irradiation bandwidth；

(6) the pipe tobacco depth of section being calculated is filtered, Function Fitting operation, is more in line with the distribution of its height Pipe tobacco is scattered rule.Due to the factors such as light is uneven, it will cause individual point depth recognition mistakes, lead to local zone height side Upward acute variation.Therefore, it in order to which the profile of extraction is as closely as possible to true value, needs to carry out these measurement data Pretreatment, discrete error point is given up.

It is firstly introduced into following filter rule: for cross section different location pipe tobacco height H_i, when certain point and adjacent left and right Two o'clock was not only very high relative to left adjoint point but also very high relative to right adjoint point compared to abnormal sharp, and with the difference of left and right two o'clock it When with being more than defined threshold M, this point will be judged as error dot, should be handled.Processing method is with left and right two o'clock Arithmetic mean of instantaneous value replace this error dot, i.e., are as follows:

After being filtered twice, the sharp point in image is eliminated.

To keep section more smooth, it is closer to real change trend, carries out Function Fitting.Fu is carried out to result is obtained In leaf series approaching.We have just extracted depth information from light field original image as a result, and have recreated and swashed The cross section profile of beam irradiation position.

Rebuild the error of profile for evaluation, the true depth of section of manual measurement has been made pair with this method rebuild profile Than as shown in figure 4, being computed, measurement error is only 5%；

It (7) is acquisition pipe tobacco volume flow information, it is also necessary to measure feed belt forward speed.If conveyor width is X, It is H (x, t) in the instantaneous depth of section of t moment pipe tobacco, belt speed measurement sensor obtains the instantaneous forward speed v (t) of pipe tobacco, into One step calculates pipe tobacco volume flow Q.

Pipe tobacco sectional area are as follows:

Pipe tobacco instantaneous volume flow rate is Q (t):

Q (t)=S (t) v (t)

In time of measuring T, pipe tobacco passes through volume flow Q:

Shown in Fig. 5；

2, online tobacco quality is read by belted electronic balance,

Belted electronic balance is that production line is original or newly-increased weighing belt, and light-field camera and linear laser are installed on online electronics In conveyor belt after weighing belt, between the two without mixing equipment.Weighing belt is weighed in real time exports weight.Belted electronic balance claims Weight gantry is installed in conveying frame, and when material passes through, metering carrying roller detects that the weight of material of weighing belt is made by lever For weighing sensor, the voltage signal for being proportional to belt load is generated, the tobacco quality passed through in time of measuring T is exported M:

3, in conjunction with distance and belt rate between weighing belt weight detecting point and volume flow test point, the two data are obtained Corresponding pipe tobacco lag time difference △ t obtains volume Q corresponding to section T pipe tobacco material synchronization time^0-TAnd mass M^0-T；

4, according to pipe tobacco material particles degree demand for control, by the ratio of quality and volume, obtain customized time quantum or The pipe tobacco bulk density of inventory.

As shown in figure 5, by the mass M in time of measuring T^0-TWith volume Q^0-TCompared to obtaining bulk density ρ b:

Using cut tobacco after certain trade mark flavoring as test object, moisture content of cut tobacco is between 12%~13% after measured.Work as cut tobacco When speed stabilizing is uniformly across conveyer belt scale under normal pressure, as unit of 30s, the cut tobacco mass M that online record passes through, to protect The cut tobacco volume flow for holding acquisition is corresponding with weighing cut tobacco, is prolonged after recording quality according to measurement point belt distance and rate When 10s postscript picture recording answer 30s inner volume flow Q.Corresponding cut tobacco mass M is compared with volume flow Q, is instantaneously weighed The corresponding actual measurement bulk density ρ b of cut tobacco.Record data as unit of 30s, METHOD FOR CONTINUOUS DETERMINATION 10min, 20 data of every group of acquisition, 3 groups of measurements are carried out altogether simultaneously.(30 seconds are unit, represent the granularity of on-line checking data output)

Online bulk density measurement result is as shown in table 1 below.

20 data in 3 groups of experiments, obtained in 10 minutes are averaged respectively, obtain first group of ρ b=0.202, are marked Quasi- deviation is 0.015；Second group of ρ b=0.179, standard deviation 0.012；Third group ρ b=0.212, standard deviation are 0.014.It is feasible that on-line checking pipe tobacco bulk density, which is used in conjunction, with light-field camera using belted electronic balance it can be seen from table , the bulk density of pipe tobacco material can be quickly and easily measured using the method, realize on-line checking pipe tobacco material filling capacity The fluctuation situation of quality stability and quality instructs cigarette primary processing and cigarette technique real-time monitoring, is of great significance.