CN108981842A - The calculating of adhesive tape material heap annular volume and unbalance loading and putty recognition methods based on the linear light source of laser - Google Patents
The calculating of adhesive tape material heap annular volume and unbalance loading and putty recognition methods based on the linear light source of laser Download PDFInfo
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- CN108981842A CN108981842A CN201810939654.9A CN201810939654A CN108981842A CN 108981842 A CN108981842 A CN 108981842A CN 201810939654 A CN201810939654 A CN 201810939654A CN 108981842 A CN108981842 A CN 108981842A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F17/00—Methods or apparatus for determining the capacity of containers or cavities, or the volume of solid bodies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/2433—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures for measuring outlines by shadow casting
Abstract
The calculating of adhesive tape material heap annular volume and unbalance loading and putty recognition methods based on the linear light source of laser, calculation method of physical volume install high-definition camera and laser emitter comprising steps of selecting two installation points above conveyor belt running respectively;Laser transmitter projects go out linear laser light source, are vertically projected to the carrier surface forming curves of adhesive tape, and surface laser line when adhesive tape zero load is defined as datum curve, there is surface laser line when load to be defined as load curve;High-definition camera with adhesive tape at an angle, establish the relation table between pixel difference and height, it is analyzed by the candid photograph to image, the corresponding material actual height of pixel on any primary load laser scanning curve is obtained, the actual height curve graph of entire load curve pixel is depicted;Load surface chart is obtained by three-dimension modeling analysis;The load volume in certain time is calculated based on grid dividing method;In conjunction with calculation method of physical volume judge adhesive tape material whether unbalance loading or putty.
Description
Technical field
The present invention relates to bulk material belt conveying detection fields, and in particular to a kind of based on the linear light source of laser
The calculating of adhesive tape material heap annular volume and unbalance loading and putty recognition methods.
Background technique
There is glue in operational process in the widely used troughed rubber belt conveyor in the industries such as power station, coal mine and harbour
It is common failure with deviation phenomenon, during transportation, is misaligned in case of discharging point or load imbalance, it will
Cause the adhesive tape of conveyer that random shift phenomenon occurs.When offset has exceeded every technic index, conveyor apparatus has
It is likely to occur the tearing of adhesive tape two sides, the material in transportation system is caused largely to spill leakage, is worth expensive adhesive tape completeness damage, from
And the disorderly closedown of a whole set of material-transporting system is further resulted in, device is stopped work.
Rubber belt from deviating detection at present is mainly completed using large-scale control station unit matching, and system complex is at high cost, and traditional
Deviation switch detection system be often unable to real-time judge sideslip state again, cause to rectify a deviation in time and damage adhesive tape, it is economical
It loses larger.To heavily loaded sideslip, there are no a set of scenes that is able to satisfy to use the detection method needed, may be implemented fastly without a set of
Speed calculates volume of material and can the not positive device of accurate judgement shots;Various kinds of sensors is all based on to transfer point chute putty at present
(radio frequency admittance type, blocking rotary type or switching regulator etc.), failure rate affected by environment is very high, and it is past to be influenced accuracy in detection by installation site
Toward lower than 50%;There are no judge putty by quickly identifying the volume of disengaging adhesive tape material in the transfer point chute unit time
Method.
Summary of the invention
The technical problem to be solved by the present invention is to detect above shortcomings for existing adhesive tape, provide one kind and be based on
The adhesive tape material heap annular volume calculating of the linear light source of laser and unbalance loading and putty recognition methods, extract the feature laser of image
Line depicts height and position of the feature laser rays in real space, is mentioned by continuously capturing in the unit time with characteristic curve
It takes, draws out the surface shape of material on adhesive tape, thus the volume of material in the unit of account time, and whether judge adhesive tape material
Unbalance loading or chute putty.
Used technical solution is the present invention to solve above-mentioned technical problem:
Adhesive tape material heap annular volume calculation method based on the linear light source of laser, includes the following steps:
Step S1, two installation points are selected above adhesive tape, one of installation point C is for installing high-definition camera (night
Between operation, need that light compensating lamp is installed), high-definition camera real-time grasp shoot adhesive tape run picture;Another installation point T is selected in from taking the photograph
The distance of 1~2m of camera installation point generates linear character laser rays for installing laser emitter;
Step S2, go out the load surface that linear laser is vertically projected to adhesive tape in the laser transmitter projects of T point, in adhesive tape
Carrier surface forms a curve and is captured by high-definition camera by unit time Δ t, due to the load-carrying height of glue
Inconsistent, then pixel position of the laser rays sampled on picture is different, surface laser line definition when adhesive tape zero load
For benchmark curve Lineb, there is surface laser line when load to be defined as load curve Linef;
Step S3, the relation table Table between pixel difference and height is establishedmh, analyzed, appointed by the candid photograph to image
Pixel on the primary load laser scanning curve of meaning and the pixel (line of two points vertical x-axis) on datum curve it
Between pixel value differenceAll pass through inquiry relation table Tablemh, to obtain the corresponding actual height of its pixel, thus
Depict the actual height curve graph of entire load curve pixel;
Step S4, by three-dimension modeling, so that analysis obtains the load surface chart in the Δ t time;
Step S5, it is based on grid dividing method, finally calculates the load volume in the Δ t time.
According to the above scheme, laser emitter middle line CT and the middle line in adhesive tape the face weight on vertical angle of view in the step S1
It closes, the irradiation of laser emitter vertical rubber belt face, high-definition camera and adhesive tape face are angled, so that the laser rays of transmitting is as far as possible
In image frame center.
According to the above scheme, the step S3 establishes the relation table Table between pixel difference and heightmhSpecifically:
Using high-definition camera as origin, level is x-axis, and for z-axis direction, (feature pixel is obtained and dump exists perpendicular to the ground
It is different on ground, because the earth is when volume calculates, it is believed that be greatly a big planar rectangular, but adhesive tape is moving
In the process, it is a curve concave surface), first in adhesive tape zero load, feature pixel is carried out to tape surface laser rays and extracts difference
For Mb0、Mb1……Mbn, then increase the characteristic body of d centimetres of unit of height upwards in turn in tape surface, and acquire every layer of spy
Levy the laser rays feature pixel M on objectl0、Ml1……Mln, wherein l indicates the number of plies, then there is formula expression:
ΔMlb≡Δl×d
Δ l indicates the pixel difference of the feature pixel between two layers of characteristic body, Δ MlbIndicate adhesive tape bottom to l layers of feature
Height distance between object;Then relation table TablemhIt establishes as follows:
According to the above scheme, the step S4 three-dimension modeling specifically:
With the movement of adhesive tape, the carrier surface laser in N number of continuous unit time Δ t is collected by high-definition camera
The feature pixel of line, and modeled by regularization surface mesh, three are carried out to the load of the rubber belt transmission in N number of unit time
Dimension modeling is presented, and y-axis pros are the directions of tape movement, then the travel distance S of adhesive tape Δ t within the unit time0P0Are as follows:
S0P0=ν0×Δt
Wherein, ν0For the uniform velocity of known adhesive tape operation.
According to the above scheme, it is specific based on grid dividing method finally to calculate the load volume in the Δ t time by the step S5
Are as follows:
Rule-based Grid DEM or volume based on triangle DEM are loaded according to the principle of tri-prismoid accumulation meter
The approximate calculation of volume:
If M 'ik、M′(i+1)k、M′i(k+1)For windrow three-dimensional surface feature pixel Mik、M(i+1)k、Mi(k+1)In the plane
Projection, if M 'ikMik、M′(i+1)kM(i+1)k、M′i(k+1)Mi(k+1)Length be respectively h1、h2、h3, triangle MikM(i+1)kMi(k+1)?
Projected area in plane is Δ S, then by Mik、M′ik、M(i+1)k、M′(i+1)k、Mi(k+1)、M′i(k+1)The volume of the triangular prism of composition
Δ V are as follows:
By Mik、M(i+1)k、Mi(k+1)Three-dimensional coordinate information, i.e. x to coordinate be respectively xik、x(i+1)k、xi(k+1), y is to coordinate
Respectively yik、y(i+1)k、yi(k+1), z to coordinate be respectively zik、z(i+1)k、zi(k+1), learn, h1=zik、h2=z(i+1)k、h3=
zi(k+1), and calculate projected area:
Δ S=(x(i+1)k-xik)(yk+1-yk)/2
Then have:
The cross-sectional volume infinitesimal of adjacent twice sweep is obtained from above:
To calculate the volume of the Belt transport material in the unit time are as follows:
Wherein, m is that longitudinal point (y-axis direction) takes point range, and n is that crosswise spots (x-axis direction) take point range.
The present invention also provides a kind of conveyor belt running material heap shape unbalance loading recognition methods, in conjunction with above-mentioned belt conveying
Machine adhesive tape material heap annular volume calculation method, includes the following steps:
When belt-conveying material, the laser rays feature pixel of high-definition camera acquisition is evenly distributed on z-axis two sides, with y
Centered on axis, material threedimensional model is divided into left and right two parts, the volume of the threedimensional model of positive direction of the x-axis is calculated as respectively
Vx+, V is calculated as to the volume of the threedimensional model of negative direction of the x-axisx-, unbalance loading threshold value constant is set as Vcx, when | Vx+-Vx-|>Vcx, then
Judge that unbalance loading phenomenon, the signal source that output operation or control need has occurred in adhesive tape.
It is defeated in conjunction with above-mentioned belt the present invention also provides a kind of belt conveyor transfer point chute material putty recognition methods
Machine adhesive tape material heap annular volume calculation method is sent, is included the following steps:
(1) volume for assuming statistics material transfer point feeding end adhesive tape is from t1Moment, until t2Moment terminates, t2-t1
It is V that chute volume is clicked and entered in material reprinting in periodin;
(2) material passes through time a length of Δ T of transfer point chute, then trough outlet (notch scanner out) starts to calculate object
It is t at the time of Material product1+ Δ T, finish time t2+ Δ T, t2-t1Material slips sump volume as V in periodout;
(3) chute residue threshold value V is setc, work as Vin-Vout>Vc, then determine chute generation buildup blocking phenomenon.
Compared with prior art, beneficial effects of the present invention:
1, the present invention is based on characteristics of image pixels to extract principle, calculates the height of feature pixel Yu adhesive tape bottom
Difference, to calculate within the unit time, the volume that material transports on adhesive tape
2, the distribution situation in conjunction with material in adhesive tape middle line two sides accurately determines load volume in point on y-axis both sides
Cloth situation, judges whether adhesive tape has occurred unbalance loading phenomenon;
3, in conjunction with the material in certain period of time enter chute volume and material is slipped groove body product moment, once it is slipped beyond setting
Slot residue threshold value then determines chute generation blocking phenomenon.
Detailed description of the invention
Fig. 1 is that the present invention is based on the implementation of the adhesive tape material heap annular volume calculation method of the linear light source of laser signals
Figure;
The structural representation of datum curve when Fig. 2 is the zero load of belt of the embodiment of the present invention and load curve when having a load
Figure;
Fig. 3 be the embodiment of the present invention to belt transport when load carry out threedimensional model structural schematic diagram;
Fig. 4 is that the embodiment of the present invention carries out the model signal that grid dividing and volume calculate to material heap shape with triangle
Figure.
Specific embodiment
Technical solution of the present invention is described in detail with reference to the accompanying drawings and examples.
Adhesive tape material heap annular volume calculation method of the present invention, includes the following steps:
Step S1, as shown in Figure 1, face S0S1P1P0For adhesive tape face, two installation points C, T, one of installation point C are selected
(need that light compensating lamp is installed) installation point, real-time grasp shoot adhesive tape operation figure when night work for the dress high-definition camera above adhesive tape
Piece;Another installation point T be adhesive tape above laser emitter installation point, be selected in from video camera installation point C have 1~2m away from
From, and mounting height is higher than high-definition camera, middle line CT and adhesive tape face S0S1P1P0Middle line it is substantially heavy on vertical angle of view
It closes, laser emitter vertical rubber belt face, high-definition camera and adhesive tape face are angled, so that the laser of laser transmitter projects
Line is as far as possible in the image frame center of high-definition camera shooting;
Step S2, go out laser in the laser transmitter projects of T point, form a curve in the carrier surface of adhesive tape, pass through
High-definition camera is captured by regular hour frequency Δ t, since the load-carrying height of glue is inconsistent, then the laser sampled
Pixel position of the line on picture is different, and surface laser line when adhesive tape zero load is defined as datum curve Lineb, having
Surface laser line when load is defined as load curve Linef, as shown in Fig. 2, when two different height loads, the laser on surface
Curve Linef_1、Linef_2, Mbi,Mfi,MgiIt is vertical rubber belt direction respectively, a bit on different height laser scanning curve;
Step S3, the relation table Table between pixel difference and height is establishedmh, analyzed, appointed by the candid photograph to image
Pixel on the primary load laser scanning curve of meaning and the pixel (line of two points vertical x-axis) on datum curve it
Between pixel value differenceAll pass through inquiry relation table Tablemh, to obtain the corresponding actual height of its pixel, thus
Depict the actual height curve graph of entire load curve pixel;
Establish the relation table Table between pixel difference and heightmhSpecifically:
Using high-definition camera as origin, it is perpendicular to the ground z-axis direction that level, which is x-axis,.Feature pixel obtains and dump exists
It is different on ground, because the earth is when volume calculates, it is believed that be greatly a big planar rectangular, but adhesive tape exists
It is a curve concave surface in motion process, therefore, first in adhesive tape zero load, feature pixel is carried out to tape surface laser rays
Extracting is respectively Mb0、Mb1……Mbn, then increase the feature of the height of unit centimetre (d cm) upwards in turn in tape surface
Object, and acquire the laser rays feature pixel M on every layer of characteristic bodyl0、Ml1……Mln, wherein l indicates the number of plies, then has formula table
Show:
ΔMlb≡Δl×d
Δ l indicates the pixel difference between two layers, Δ MlbHeight distance of the expression adhesive tape bottom to l interlayer;
Step S4, by three-dimension modeling, so that analysis obtains the load surface chart in the Δ t time;
Three-dimension modeling specifically:
With the movement of adhesive tape, the carrier surface laser in N number of continuous unit time Δ t is collected by high-definition camera
The feature pixel of line, and modeled by regularization surface mesh, three are carried out to the load of the rubber belt transmission in N number of unit time
Dimension modeling is presented, and positive direction of the y-axis is the direction of tape movement, as shown in figure 3, wherein S0P0For adhesive tape within the unit time Δ t
Travel distance, it is known that adhesive tape operation uniform velocity be ν0, then travel distance are as follows:
S0P0=ν0×Δt
Step S5, it is based on grid dividing method, finally calculates the load volume in the Δ t time, specifically:
Rule-based Grid DEM or volume based on triangle DEM, usually can be according to prism, tri-prismoid accumulation meter
Principle carry out load volume approximate calculation.Its basic thought is the average height with area of base multiplied by grid points curved surface,
Then it is accumulated, then can acquire the volume of rule-based Grid DEM.
As shown in figure 4, the embodiment of the present invention carries out grid dividing with triangle and volume calculates, M 'ik、M′(i+1)k、
M′i(k+1)For windrow three-dimensional surface feature pixel Mik、M(i+1)k、Mi(k+1)Projection in the plane, if M 'ikMik、M′(i+1) kM(i+1)k、M′i(k+1)Mi(k+1)Length be respectively h1、h2、h3, triangle MikM(i+1)kMi(k+1)Projected area in xoy plane
For Δ S, then by Mik、M′ik、M(i+1)k、M′(i+1)k、Mi(k+1)、M′i(k+1)The volume delta V of the triangular prism of composition are as follows:
By Mik、M(i+1)k、Mi(k+1)Three-dimensional coordinate information (each point in x, y, z to spatial value), i.e. x is to coordinate
Respectively xik、x(i+1)k、xi(k+1), y to coordinate be respectively yk、yk、yk+1, z to coordinate be respectively zik、z(i+1)k、zi(k+1), it learns,
h1=zik、h2=z(i+1)k、h3=zi(k+1), and calculate projected area:
Δ S=(x(i+1)k-xik)(yk+1-yk)/2
Then have:
The cross-sectional volume infinitesimal of adjacent twice sweep is obtained from above:
Wherein z(i+1)(k+1)It is adjacent twice sweep with respect to z(i+1)k、zi(k+1)And so on coordinate, to calculate unit
Time (volume of the Belt transport material in N number of Δ t) are as follows:
Wherein, m is that longitudinal point takes point range, and n is that crosswise spots take point range.
Adhesive tape material heap shape unbalance loading identification: based on the above-mentioned adhesive tape material heap annular volume by the linear light source of laser
Calculation method, when belt-conveying material, the laser rays feature pixel of high-definition camera acquisition is evenly distributed on z-axis two sides, with y-axis
Centered on, material threedimensional model is divided into left and right two parts, V is calculated as to the volume of the threedimensional model of positive direction of the x-axis respectivelyx+,
V is calculated as to the volume of the threedimensional model of negative direction of the x-axisx-, unbalance loading threshold value constant is set as Vcx, when | Vx+-Vx-|>Vcx, then sentence
Unbalance loading phenomenon, the signal source that output operation or control need has occurred in breaking adhesive tape.
Adhesive tape chute material putty identification: based on the above-mentioned adhesive tape material heap annular volume by the linear light source of laser
Calculation method, due to adhesive tape be it is continuous, continuously transport material, thus judge whether the amount of the disengaging chute of material consistent, it is first
The material that must first determine disengaging is same target, it is assumed that it is from t that the volume of chute is clicked and entered in statistics material reprinting1Moment, until t2
Moment terminates, t2-t1It is V that chute volume is clicked and entered in material reprinting in periodin;Material is a length of by the time of transfer point chute
Δ t is t at the time of then notch scanner starts to calculate volume of material out1+ Δ t, finish time t2+ Δ t, t2-t1Period
Interior material slips sump volume as Vout;Set chute residue threshold value Vc, work as Vin-Vout>Vc, then determine chute generation buildup putty
Phenomenon.
Obviously, the above embodiment is merely an example for clearly illustrating the present invention, and is not to of the invention
The restriction of embodiment.For those of ordinary skill in the art, spirit under this invention is extended out aobvious and easy
The variation or variation seen are still in the protection scope of this invention.
Claims (7)
1. the adhesive tape material heap annular volume calculation method based on the linear light source of laser, which comprises the steps of:
Step S1, two installation points are selected above adhesive tape, one of installation point C for installing high-definition camera, take the photograph by high definition
Camera real-time grasp shoot adhesive tape runs picture;Another installation point T is selected in a distance from 1~2m of video camera installation point, for pacifying
Laser emitter is filled, linear character laser rays is generated;
Step S2, go out the load surface that linear laser is vertically projected to adhesive tape in the laser transmitter projects of T point, in the load of adhesive tape
Surface forms a curve and is captured by high-definition camera by unit time Δ t, since the load-carrying height of glue is different
It causes, then pixel position of the laser rays sampled on picture is different, and surface laser line when adhesive tape zero load is defined as base
Directrix curve Lineb, there is surface laser line when load to be defined as load curve Linef;
Step S3, the relation table Table between pixel difference and height is establishedmh, it is analyzed by the candid photograph to image, it is any one
The pixel value difference between the pixel on pixel and datum curve on secondary load laser scanning curveAll pass through
Inquire relation table Tablemh, to obtain the corresponding actual height of its pixel, to depict entire load curve pixel
Actual height curve graph;
Step S4, by three-dimension modeling, so that analysis obtains the load surface chart in the Δ t time;
Step S5, it is based on grid dividing method, finally calculates the load volume in the Δ t time.
2. the adhesive tape material heap annular volume calculation method according to claim 1 based on the linear light source of laser, special
Sign is that laser emitter middle line CT is overlapped on vertical angle of view with the middle line in adhesive tape face in the step S1, laser emitter
The irradiation of vertical rubber belt face, high-definition camera and adhesive tape face are angled, so that the laser rays of transmitting is as far as possible in image frame
Centre.
3. the adhesive tape material heap annular volume calculation method according to claim 1 based on the linear light source of laser, special
Sign is that the step S3 establishes the relation table Table between pixel difference and heightmhSpecifically:
Using high-definition camera as origin, it is perpendicular to the ground z-axis direction, first in adhesive tape zero load, to adhesive tape table that level, which is x-axis,
Face laser rays carries out feature pixel to extract being respectively Mb0、Mb1……Mbn, then increase unit d upwards in turn in tape surface
Centimetre height characteristic body, and acquire the laser rays feature pixel M on every layer of characteristic bodyl0、Ml1……Mln, wherein l is indicated
The number of plies then has formula expression:
ΔMlb≡Δl×d
Δ l indicates the pixel difference of the feature pixel between two layers of characteristic body, Δ MlbIndicate adhesive tape bottom between l layers of characteristic body
Height distance;Then relation table TablemhIt establishes as follows:
4. the adhesive tape material heap annular volume calculation method according to claim 3 based on the linear light source of laser, special
Sign is, the step S4 three-dimension modeling specifically:
With the movement of adhesive tape, the carrier surface laser rays in N number of continuous unit time Δ t is collected by high-definition camera
Feature pixel, and modeled by regularization surface mesh, three-dimensional is carried out to the load of the rubber belt transmission in N number of unit time and is built
Mould is presented, and y-axis pros are the directions of tape movement, then the travel distance S of adhesive tape Δ t within the unit time0P0Are as follows:
S0P0=ν0×Δt
Wherein, ν0For the uniform velocity of known adhesive tape operation.
5. the conveyor belt running material heap annular volume according to claim 1 based on the linear light source of laser calculates
Method, which is characterized in that the step S5 finally calculates the load volume in the Δ t time based on grid dividing method specifically:
Rule-based Grid DEM or volume based on triangle DEM carry out load volume according to the principle of tri-prismoid accumulation meter
Approximate calculation:
If M 'ik、M′(i+1)k、M′i(k+1)For windrow three-dimensional surface feature pixel Mik、M(i+1)k、Mi(k+1)Projection in the plane,
If M 'ikMik、M′(i+1)kM(i+1)k、M′i(k+1)Mi(k+1)Length be respectively h1、h2、h3, triangle MikM(i+1)kMi(k+1)In plane
On projected area be Δ S, then by Mik、M′ik、M(i+1)k、M′(i+1)k、Mi(k+1)、M′i(k+1)The volume delta V of the triangular prism of composition
Are as follows:
By Mik、M(i+1)k、Mi(k+1)Three-dimensional coordinate information, i.e. x to coordinate be respectively xik、x(i+1)k、xi(k+1), y to coordinate distinguish
For yk、yk、yk+1, z to coordinate be respectively zik、z(i+1)k、zi(k+1), learn, h1=zik、h2=z(i+1)k、h3=zi(k+1), and count
Calculate projected area:
Δ S=(x(i+1)k-xik)(yk+1-yk)/2
Then have:
The cross-sectional volume infinitesimal of adjacent twice sweep is obtained from above:
To calculate the volume of the Belt transport material in the unit time are as follows:
Wherein, m is that longitudinal point takes point range, and n is that crosswise spots take point range.
6. a kind of conveyor belt running material heap shape unbalance loading recognition methods, it is based in conjunction with Claims 1 to 5 is described in any item
The adhesive tape material heap annular volume calculation method of the linear light source of laser, which comprises the steps of:
(1) when belt-conveying material, the laser rays feature pixel of high-definition camera acquisition is evenly distributed on z-axis two sides, with y-axis
Centered on, material threedimensional model is divided into left and right two parts, V is calculated as to the volume of the threedimensional model of positive direction of the x-axis respectivelyx+,
V is calculated as to the volume of the threedimensional model of negative direction of the x-axisx-;
(2) unbalance loading threshold value constant is set as Vcx, when | Vx+-Vx-|>Vcx, then judge that adhesive tape has occurred unbalance loading phenomenon, output operation or
Control the signal source needed.
7. a kind of belt conveyor transfer point chute material putty recognition methods, in conjunction with the described in any item bases of Claims 1 to 5
In the adhesive tape material heap annular volume calculation method of the linear light source of laser, which comprises the steps of:
(1) volume for assuming statistics material transfer point feeding end adhesive tape is from t1Moment, until t2Moment terminates, t2-t1Time
It is V that chute volume is clicked and entered in material reprinting in sectionin;
(2) material passes through time a length of Δ T of transfer point chute, then is t at the time of trough outlet starts to calculate volume of material1+Δ
T, finish time t2+ Δ T, t2-t1Material slips sump volume as V in periodout;
(3) chute residue threshold value V is setc, work as Vin-Vout>Vc, then determine chute generation buildup blocking phenomenon.
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