CN114689153B - Online tobacco shred blending proportion nondestructive testing device and method based on laser technology - Google Patents
Online tobacco shred blending proportion nondestructive testing device and method based on laser technology Download PDFInfo
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- CN114689153B CN114689153B CN202210316238.XA CN202210316238A CN114689153B CN 114689153 B CN114689153 B CN 114689153B CN 202210316238 A CN202210316238 A CN 202210316238A CN 114689153 B CN114689153 B CN 114689153B
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- 238000002156 mixing Methods 0.000 title claims abstract description 170
- 241000208125 Nicotiana Species 0.000 title claims abstract description 106
- 235000002637 Nicotiana tabacum Nutrition 0.000 title claims abstract description 106
- 238000000034 method Methods 0.000 title claims abstract description 59
- 238000009659 non-destructive testing Methods 0.000 title claims abstract description 22
- 238000005516 engineering process Methods 0.000 title claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 102
- 230000008569 process Effects 0.000 claims abstract description 34
- 238000001514 detection method Methods 0.000 claims abstract description 21
- 238000004364 calculation method Methods 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims description 15
- 239000003638 chemical reducing agent Substances 0.000 claims description 3
- 230000004888 barrier function Effects 0.000 claims 1
- 239000002245 particle Substances 0.000 abstract description 7
- 238000003908 quality control method Methods 0.000 abstract description 2
- 238000012545 processing Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
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- 239000011236 particulate material Substances 0.000 description 1
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- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G11/00—Apparatus for weighing a continuous stream of material during flow; Conveyor belt weighers
-
- 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
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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
- B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
-
- 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
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
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Abstract
The embodiment of the specification provides an online tobacco shred proportion blending nondestructive testing device and method based on a laser technology, wherein the method comprises the following steps: detecting the space and the material sectional area of the belt conveyor by a laser radar, and respectively calculating the volume flow before and after blending the cut tobacco by combining the linear speed of the belt conveyor detected by the speed measuring device; detecting by an electronic belt scale to obtain the mass of the blending material and the instantaneous mass flow of each blending component, and calculating the bulk density and the instantaneous blending proportion of the tobacco shreds before and after blending by combining the volume flow of the tobacco shreds before and after blending; according to the instantaneous blending proportion, analyzing and calculating a proportion variation coefficient and a blending precision value in the blending process, and adjusting the blending process according to a calculation result. The method realizes the detection of the instant blending precision of the blended tobacco particle materials, and improves the process quality control level of the tobacco shred blending process.
Description
Technical Field
The document relates to the technical field of tobacco processing equipment, in particular to an online tobacco shred blending proportion nondestructive testing device and method based on a laser technology.
Background
In the tobacco shred production process of cigarette industry enterprises, the smallest-size particle units after tobacco material processing are filiform raw materials, and an online tobacco shred blending process is to blend modules or formula cut tobacco (main components), cut stems, expanded cut tobacco, reconstituted cut tobacco, recovered cut tobacco (the latter four are blending materials) and the like according to the product design requirements of the enterprises. The proportioning precision of the tobacco shred blending is not more than 1.0% according to the quality requirement of the process specification, so that the tobacco shred proportioning after mixing is accurate and uniform. According to different production organization modes, the processing mode mainly adopted at present comprises two modes of proportional blending or total blending, wherein the technological principle of tobacco shred proportional blending is that based on the tobacco shred flow, the flow of other types of blending particles is regulated according to the formula proportion by a control system, and the blending particles flow together to a belt conveyor and are further conveyed to subsequent procedures such as flavoring and mixing, so that the quantitative proportion blending is realized.
Under the trend that the quality requirements of the existing tobacco shred manufacturing process are more and more refined, the electronic belt scale is only used as the component metering monitoring control equipment only for the tobacco shred blending process, and the new process control requirements cannot be met. From the device usage function perspective: the metering precision of the electronic belt scale is easily affected by factors such as uneven distribution and intermittent of real materials, the rotation of the symmetrically-weighted backing roller is required to be checked regularly, and a large amount of tobacco shreds are required to be consumed by the electronic belt scale in the actual calibration process, so that the consumption of raw materials for cigarette processing is increased; analysis from the process quality control angle: when the quantitative output volume of the blending material is small and the blending proportion is low (less than 10%), blocking is easy to generate, the low belt speed of the electronic belt scale can cause poor blending continuity, the material output continuity is poor, the distribution is uneven, the mixing degree of tobacco material particles is low, and the mixing uniformity of tobacco shreds after blending is not up to the standard; when the quantitative output volume of the blending material is larger, the blending proportion is higher (higher than 30%), the stacking blockage is easily caused at the blanking position, the material breaking is caused, the distribution of the blending material is discontinuous, the cut tobacco in a partial flow interval is not blended with other granular materials, and even the instant blending progress is larger by starting the equipment for dredging the blocking problem. In addition, the discontinuous material flow working conditions such as intermittent and piling and the like, which are required to be fluffy and light in weight in other granular material mixing structures, can influence the process quality indexes such as mixing precision, mixing uniformity, cut tobacco filling value and the like, and the processing procedures of the subsequent flavoring mixing, storage and transportation process links. Therefore, there is a need for a nondestructive testing device and method for on-line tobacco shred proportion blending precision.
Disclosure of Invention
One or more embodiments of the present disclosure provide an online tobacco shred blending proportion nondestructive testing device based on a laser technology, including a belt conveyor, an electronic belt scale, a laser radar and an industrial computer;
the electronic belt scale is used for conveying the mixed cut stem materials and measuring the mass flow of the conveyed mixed cut stem materials; the conveying direction of the electronic belt scale is perpendicular to the conveying direction of the belt conveyor, and the electronic belt scale is positioned in the middle of the belt conveyor, so that the belt conveyor is divided into a stage area before blending and a stage area after blending;
a vibration conveying groove is formed between the belt conveyor and the electronic belt scale, the vibration conveying groove is in non-contact with the belt electronic scale and the belt conveyor, and the vibration conveying groove is used for discretely covering the cut stem doped materials conveyed by the electronic belt scale on the main cut tobacco materials conveyed by the belt conveyor;
one end of the belt conveyor is provided with a speed measuring device which is used for detecting the actual running line speed of the conveyor belt of the belt conveyor;
the laser radar is fixed above the belt conveyor through a mounting bracket and is used for detecting the sectional area of a material conveyed by the belt conveyor;
the industrial computer is respectively connected with the laser radar, the speed measuring device, the belt conveyor and the electronic belt scale, and is used for calculating the instantaneous blending proportion variation coefficient and blending precision according to the detection data and adjusting the control instruction in real time according to the calculation result.
Further, the laser radar comprises a first laser radar and a second laser radar, wherein the first laser radar is arranged in a stage area before doping, and the second laser radar is arranged in a stage area after doping.
Further, the width of the laser scanning area at the tail end of the laser radar is equal to the width of a conveying belt of the belt conveyor.
Further, the speed measuring device is a speed measuring wheel and comprises a roller and a mounting shaft, the mounting shaft is arranged on the inner side wall of the baffle of the belt conveyor, and the roller is in contact with the conveyor belt of the belt conveyor and keeps certain pressure.
Further, the device also comprises a material shape leveling roller, wherein the length of the material shape leveling roller is larger than or equal to the width of a conveying belt of the belt conveyor, and the material shape leveling roller is used for leveling the surface shape of a material to be detected by the laser radar.
Further, the material shape leveling roller mainly comprises a stirring roller, a speed reducer and an independent motor, the material shape leveling roller is connected with the industrial computer, and the rotating speed of the independent motor is adjusted in real time according to the feedback of the first laser radar to the main cut tobacco material detection, so that the rotating speed of the stirring roller is adjusted.
Further, the height of the material stirring roller is lower than that of baffles at two sides of the belt conveyor.
Further, the rotation direction of the material stirring roller is the same as the material conveying direction.
Further, the rotating speed of the stirring roller is not less than the material conveying speed.
One or more embodiments of the present disclosure provide a detection method of an online tobacco shred blending proportion nondestructive detection device based on a laser technology, including:
detecting the space and the material sectional area of the belt conveyor by a laser radar, and respectively calculating the volume flow before and after blending the cut tobacco by combining the linear speed of the belt conveyor detected by the speed measuring device;
detecting by an electronic belt scale to obtain the mass of the blending material and the instantaneous mass flow of each blending component, and calculating the bulk density and the instantaneous blending proportion of the tobacco shreds before and after blending by combining the volume flow of the tobacco shreds before and after blending;
and according to the instantaneous blending proportion, analyzing and calculating a proportion variation coefficient and a blending precision value in the blending process, and carrying out feedback adjustment on the blending process according to a calculation result.
By adopting the embodiment of the invention, the higher-level process quality monitoring control is realized for the blending process based on the laser technology, the detection and data acquisition of the tobacco shred blending process are more accurate and finer, the quantitative determination of the degree of variation of the blending proportion in each batch of blending process is realized, the continuous detection of the instantaneous quality, volume and density flow of each component blending material including main cut tobacco, cut stem and the like is realized, the detection control dimension of the blending process is improved, and the detection and sensing means of key processes in the production process of making cut tobacco are enriched.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
For a clearer description of one or more embodiments of the present description or of the solutions of the prior art, the drawings that are necessary for the description of the embodiments or of the prior art will be briefly described, it being apparent that the drawings in the description that follow are only some of the embodiments described in the description, from which, for a person skilled in the art, other drawings can be obtained without inventive faculty.
FIG. 1 is a schematic structural diagram of an on-line tobacco shred blending proportion nondestructive testing device based on a laser technology according to one or more embodiments of the present disclosure;
FIG. 2 is a schematic diagram of an online tobacco shred blending proportion nondestructive testing method of an online tobacco shred blending proportion nondestructive testing device based on a laser technology according to one or more embodiments of the present disclosure;
FIG. 3 is a schematic cross-sectional view of a belt conveyor belt of an on-line tobacco shred blending proportion nondestructive testing device based on laser technology according to one or more embodiments of the present disclosure;
FIG. 4 is a schematic cross-sectional view of a main cut tobacco material on a conveyor belt of a belt conveyor before blending by an on-line cut tobacco blending proportion nondestructive testing device based on a laser technology according to one or more embodiments of the present disclosure;
fig. 5 is a schematic cross-sectional view of the whole material on the belt conveyor after blending by the online tobacco shred blending proportion nondestructive testing device based on the laser technology according to one or more embodiments of the present disclosure.
Reference numerals illustrate:
01: a first lidar; 02: a second lidar; 03: a belt conveyor; 04: a tachometer wheel; 05: a material-shaped leveling roller; 06: a vibration conveying groove; 07: an electronic belt scale; 08: an industrial computer; 09: and (3) a bracket.
Detailed Description
In order to enable a person skilled in the art to better understand the technical solutions in one or more embodiments of the present specification, the technical solutions in one or more embodiments of the present specification will be clearly and completely described below with reference to the drawings in one or more embodiments of the present specification, and it is obvious that the described embodiments are only some embodiments of the present specification, not all embodiments. All other embodiments, which can be made by one or more embodiments of the present disclosure without inventive faculty, are intended to be within the scope of the present disclosure.
The embodiment of the invention provides an online tobacco shred blending proportion nondestructive testing device based on a laser technology, and fig. 1 is a schematic structural diagram of the online tobacco shred blending proportion nondestructive testing device based on the laser technology, provided by one or more embodiments of the present disclosure, as shown in fig. 1, the online tobacco shred blending proportion nondestructive testing device based on the laser technology according to the embodiment of the present invention specifically includes: laser radar, belt conveyor 03, electronic belt balance 07, industrial computer 08, etc.;
the belt conveyor 03 is used for conveying main cut tobacco materials, the electronic belt balance 07 is used for conveying mixed cut stem materials, the conveying direction is shown in fig. 1, and the electronic belt balance 07 is used for measuring the mass flow of the conveyed mixed cut stem materials; the conveying direction of the electronic belt scale 07 is perpendicular to the conveying direction of the belt conveyor 03, and the electronic belt scale 07 is positioned in the middle of the belt conveyor 03, so that the belt conveyor 03 is divided into a pre-blending stage area and a post-blending stage area.
The laser radar is hung above the material flow direction of the belt conveyor 03 through a bracket 09 and is used for detecting the sectional area of the material conveyed by the belt conveyor 03; specifically, the laser radar includes a first laser radar 01 and a second laser radar 02, the first laser radar 01 is disposed in a stage area before doping, the second laser radar 02 is disposed in a stage area after doping, and the first laser radar 01 and the second laser radar 02 are in symmetrical relation with a perpendicular bisector of the belt conveyor 03 as an axis.
The first laser radar 01 is used for detecting the space sectional area of the belt conveyor when in idle load before blending and detecting the sectional area of the main cut tobacco material form, and the second laser radar 02 is used for detecting the sectional area of the cut tobacco and stem integral accumulation material form after blending.
The height of the laser radar from the belt conveyor 03 is such that the laser scanning area width at the end of the laser radar is equal to the conveyor belt width of the belt conveyor 03. And a detection instrument for detecting the moisture and the temperature of the blended material is also arranged at the rear part of the second laser radar 02.
One end of the belt conveyor 03 is provided with a speed measuring device, and the speed measuring device in the embodiment adopts a speed measuring wheel 04 for detecting the actual running line speed of the conveyor belt of the belt conveyor 03. The tachometer wheel 04 comprises a roller and a mounting shaft, wherein the mounting shaft is arranged on the inner side wall of a baffle of the belt conveyor 03, and the roller is in contact with a conveyor belt of the belt conveyor 03 and keeps certain pressure, so that the roller can rotate under the action of rolling friction force and does not slip.
In this embodiment, the detecting device further includes a material leveling roller 05, where the material leveling roller 05 is disposed in the area of the stage before blending, and is used for leveling the surface morphology of the material to be detected by the laser radar. The length of the material-shaped leveling roller 05 is larger than or equal to the width of the conveying belt of the belt conveyor 03, and spans the conveying direction of the belt conveyor 03.
The material-shaped leveling roller 05 mainly comprises a stirring roller, a speed reducer and an independent motor, wherein the stirring roller is lower than two side baffles of the belt conveyor 03 in height, so that the stirring roller can trim the shape of the main cut tobacco material before blending when the belt conveyor 03 works under rated bearing capacity, the stirring roller 05 controls the rotating speed of the stirring roller through the independent motor, the rotating direction of the stirring roller is the same as the material flowing direction, and the linear speed of the stirring roller is not less than the material conveying speed
The material shape leveling roller 05 is connected with the industrial computer 08, can detect the accumulation form and the height of the main cut tobacco material according to the first laser radar 01, adjusts the rotating speed of an independent motor in real time, and levels the appearance of the material with higher unevenness according to the material flowing speed and the linear speed difference of the stirring roller.
The belt conveyor 03 and the electronic belt balance 07 are provided with a vibration conveying groove 06 therebetween, a certain distance is reserved between the vibration conveying groove 06 and the belt electronic balance and between the vibration conveying groove 06 and the belt conveyor 03, blended cut stems firstly enter the belt electronic balance 07 for mass flow measurement, then fall into the groove of the vibration conveying groove 06 after being vertically thrown off by a certain distance at the outlet of the belt electronic balance 07, and the vibration conveying groove 06 is used for dispersing blended cut stem materials conveyed by the electronic belt balance 07, continuously and gently covering the main cut stem materials conveyed by the belt conveyor 03 through natural throwing off.
The industrial computer 08 is respectively connected with the laser radar, the speed measuring device, the belt conveyor 03 and the electronic belt scale 07 and is mainly responsible for data acquisition, analysis, processing, storage, transmission and feedback control instructions of the data acquisition terminal, calculating the instantaneous blending proportion variation coefficient and blending precision according to the detection data, and adjusting the control instructions in real time according to the calculation result. The industrial computer 08 includes a display screen through which the real-time status of the material can be visually displayed.
The operation process of blending tobacco shreds and carrying out non-destructive testing of blending proportion by the device of the embodiment is as follows:
(1) The preparation stage: starting all functional parts of the device, firstly, carrying out idle running on a belt conveyor for a plurality of minutes, measuring the linear speed of a conveyor belt of the belt conveyor by a velocimeter, measuring the sectional area in a carrier space of the belt conveyor when the belt conveyor is in an idle state by a first laser radar, and calibrating a measuring zero point; meanwhile, the second laser radar sets the same reference value by using the zero point calibrated by the first laser radar; and (3) checking an electronic belt scale for a stem shred blending material streamline, starting up the operation condition of the vibration conveying groove, detecting a temperature monitor, detecting that the indication of the moisture meter is normal, and detecting that the operation condition of the acquired data in an industrial computer and software thereof is normal.
(2) Stage before blending: the main cut tobacco material starts to be conveyed to the inlet of the belt conveyor, at the moment, the mass flow of the main cut tobacco is measured by a weight detecting instrument corresponding to the upstream, and the linear speed of the belt conveyor detected by the tachometer wheel is related to the corresponding mass flow data. After the main cut tobacco material passes through the top of the material-shaped leveling roller pair and the appearance is leveled, the cross section area and related data of the stacking form of the main cut tobacco material are measured and calculated by a first laser radar. At the moment, the cut stems mixed with the cut stem material line also flow into the vibration conveying groove through the electronic belt scale, and the scattered, continuous and spread cut stem material flow is ready to be gathered into the belt conveyor.
(3) Stage in blending: when the main cut tobacco material is conveyed to the middle part of the belt conveyor, the blended cut tobacco stems are thrown from the vibration conveying groove to the upper part of the main cut tobacco material shape. The instantaneous blending proportion is combined with the cut tobacco material flow by taking the mass flow of the material as a measuring unit according to the design value of the product formula. The stacking and layering forms of the whole materials are as follows: the lower layer is a main cut tobacco stacking layer, and the upper layer is a cut stem blending layer, and then the cut tobacco is conveyed downstream.
(4) Stage after blending: the sectional area of the blended whole material is measured and calculated by a second laser radar and related parameters thereof, and the calculated data are processed and calculated in parallel in a computer before being measured and calculated by the first laser radar, so that key data such as instantaneous blending proportion variation coefficient and blending precision of a blending process and instantaneous data groups of the quality, density and volume of each blending component in the blending process are obtained. And finally, the blended integral materials enter a subsequent perfuming and mixing procedure for processing.
The embodiment of the invention provides an online tobacco shred blending proportion nondestructive testing method based on a laser technology, and fig. 2 is a schematic diagram of an online tobacco shred blending proportion nondestructive testing method of an online tobacco shred blending proportion nondestructive testing device based on the laser technology, which is provided by one or more embodiments of the present specification, as shown in fig. 2, and the online tobacco shred blending proportion nondestructive testing method based on the laser technology according to the embodiment of the present invention specifically includes:
s1, detecting the space and the material sectional area of a belt conveyor through a laser radar, and respectively calculating the volume flow before and after blending the cut tobacco by combining the linear speed of a conveyor belt of the belt conveyor detected by a speed measuring device
Specifically, the first laser radar is used for detecting the space sectional area of the belt conveyor when in idle load before blending and detecting the sectional area of the main cut tobacco material, the second laser radar is used for detecting the sectional area of the whole pile material of cut tobacco and cut stems after blending, the laser radar scanning range is set to be in a measuring angle range of 74-106 degrees, the angle resolution is 0.1667 degrees, when the conveying belt is in idle load, the instantaneous idle load area S of the conveying belt is obtained by accumulating the areas of a plurality of small triangles with equal included angles in the angle range of the laser radar, as shown in fig. 3, the sectional area S of the conveying belt is in idle load 0 The calculation method is shown in formula 1:
S 0 ＝0.5×(x 1 x 2 sinθ 1 +x 2 x 3 sinθ 2 +…+x n-1 x n sinθ n-1 +x n x n+1 sinθ n )
equation 1;
wherein S is 0 When the conveyor belt is empty, the empty instantaneous sectional area detected by the first laser radar is S 0 The value is the zero marker value of the detection system; x is x i For the laser radar at a certain corresponding resolution angle theta i When the conveyor belt is in an idle state, the detected object (the detected object in the state is a conveyor belt) detects the radial distance from the detection point to the light source; the idle state detection value of the second laser radar is calibrated by the zero position value of the first laser radar.
When the conveyor belt is provided with the accumulated tobacco particulate material (such as main cut tobacco leaves, accumulated sectionsTrapezoid-like surface material, as shown in fig. 4, the instantaneous sectional area of the material on the conveyor belt of the main cut tobacco before blending can be obtained by accumulating the areas of a plurality of small triangles, and the sectional area S of the material on the conveyor belt of the main cut tobacco before blending Before blending The calculation method is shown in formula 2:
S before blending ＝S′ Main shredded tobacco -S 0
＝0.5×(x 1 ′x 2 ′sinθ 1 +x 2 ′x 3 ′sinθ 2 +…+x n_1 ′x n ′sinθ n_1 +x n ′x n+1 ′sinθ n )-0.5×(x 1 x 2 sinθ 1 +x 2 x 3 sinθ 2 +…+x n_1 x n sinθ n_1 +x n x n+1 sinθ n )
Equation 2;
wherein S is Before blending Carrying the main cut tobacco material on a conveyor belt, and then passing through a first laser radar, wherein the instantaneous sectional area of the cut tobacco stacking form detected by the laser radar; x is x i ' is the laser radar at a certain corresponding resolution angle theta i When the device is used, the detected point (the conveyor belt is used for bearing the main cut tobacco, the detected point is the outer contour points of the main cut tobacco in the vertical direction) is located at the radius distance from the light source.
When the granular material on the conveyor belt is blended with other tobacco shred blends (such as cut stems), as shown in FIG. 5, the instantaneous sectional area of the blended overall stacked material can be obtained by accumulating the areas of a plurality of small triangles, and the overall sectional area S of the blended material on the conveyor belt is After blending The calculation method is shown in formula 3:
S after blending ＝S′ Main shredded tobacco +S″ Cut stem -S 0
＝0.5×(x 1 ″x 2 ″sinθ 1 +x 2 ″x 3 ″sinθ 2 +…+x n_1 ″x n ″sinθ n_1 +x n ″x n+1 ″sinθ n )-0.5×(x 1 x 2 sinθ 1 +x 2 x 3 sinθ 2 +…+x n_1 x n sinθ n_1 +x n x n+1 sinθ n )
Equation 3;
wherein S is After blending Carrying the instant sectional area of the bulk tobacco shred material accumulation form after blending detected by the second laser radar after the lower-layer main tobacco shred and upper-layer stem shred materials pass through the second laser radar for the conveyor belt;
x i "is the laser radar at a certain corresponding resolution angle theta i When the device is used, the radius distance from a detection point of a detected object (the detected object is cut stems and cut leaves integrally stacked materials in each point of the outer contour in the vertical direction) to a light source is kept by a conveying belt and the cut stems and cut leaves are mixed.
Further calculations can be made from equations 1-3, as shown in equation 4:
S″ cut stem ＝S After blending -S Before blending
＝0.5×(x 1 ″x 2 ″sinθ 1 +x 2 ″x 3 ″sinθ 2 +…+x n_1 ″x n ″sinθ n_1 +x n ″x n+1 ″sinθ n )-0.5×(x 1 ′x 2 ′sinθ 1 +x 2 ′x 3 ′sinθ 2 +…+x n_1 ′x n ′sinθ n_1 +x n ′x n+1 ′sinθ n )
Equation 4;
wherein, the specifications of the two groups of laser radars are the same, and the resolution of each angle of the single laser radar is equal, namely theta 1 ＝θ 2 ＝…＝θ n-1 ＝θ n ，x i ”≤x i ' i=1, 2 … n, x is the distance from the detected light source on the same scan radius.
Roller type speed detector (speed measuring wheel for short) mounted at position of feeding inlet of conveying belt of belt conveyor near inner wall for detecting speed v of conveying belt at time t in real time t The angle information obtained by the speed measuring wheel is calculated according to a certain rule to obtain the linear speed of the belt, and the real-time speed data and the laser radar data are transmitted to the industryThe computer performs coupling calculation of the associated data:
before blending: the volume flow of the main cut tobacco at the time t is V Before blending ＝V Main shredded tobacco ＝S Before blending ×v t ；
After blending: the volume flow of the whole material of the main cut leaves and the cut stems is V After blending ＝S After blending ×v t ；
Blend: the volume flow of the volume of the cut stem material is V Cut stem ＝(S After blending －S Before blending )×v t 。
S2, detecting the mass of the blended materials and the instantaneous mass flow of each blended component through an electronic belt scale, and calculating the bulk density and the instantaneous blending proportion of the cut tobacco before and after blending by combining the volume flow of the cut tobacco before and after blending.
Specifically, the mass flow of the main cut tobacco and the blended material (cut stem) is detected by an electronic belt scale, and the instantaneous mass flow M at the corresponding time t can be known Main shredded tobacco And M is as follows Cut stem ，
The mass flow rate of the tobacco shred particle material before blending is M Before blending ＝M Main shredded tobacco ；
The mass flow rate of the tobacco shred particle material after blending is M After blending ＝M Main shredded tobacco +M Cut stem 。
The density of each component blend before and after blending is shown in formulas 5-7:
the blending proportion value of the tobacco shred is
S3, according to the instantaneous blending proportion, analyzing and calculating a proportion variation coefficient and a blending precision value in the blending process, and carrying out feedback adjustment on the blending process according to a calculation result.
Specifically, the calculation method of the proportional variation coefficient and the blending precision value in the blending process is shown in the formula 8 and the formula 9:
wherein CV is the uniformity variation coefficient in the blending process, S is the standard deviation of the instantaneous blending proportion data set in a certain time period, mu is the average value of the instantaneous blending proportion data set in a certain time period, p is the blending proportion value, delta WP For blending accuracy, C WP For the actual blending proportion value, P WP The mixing proportion is set for the materials.
The invention has the following beneficial effects:
the method realizes higher-level process quality monitoring control on the blending process based on the laser technology, more accurate and refined detection and data acquisition of the tobacco shred blending process, realizes quantitative determination of the variation degree of blending proportion in each batch of blending process, simultaneously realizes continuous detection of the instantaneous quality, volume and density flow of each component blending material including main tobacco shreds, stem shreds and the like, improves the detection control dimension of the blending process, and enriches the detection and perception means of key processes in the tobacco shred production process.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (9)
1. The application method of the online tobacco shred blending proportion nondestructive testing device based on the laser technology is applied to the online tobacco shred blending proportion nondestructive testing device based on the laser technology and is characterized by comprising a belt conveyor, an electronic belt scale, a laser radar and an industrial computer;
the electronic belt scale is used for conveying the mixed cut stem materials and measuring the mass flow of the conveyed mixed cut stem materials; the conveying direction of the electronic belt scale is perpendicular to the conveying direction of the belt conveyor, and the electronic belt scale is positioned in the middle of the belt conveyor, so that the belt conveyor is divided into a stage area before blending and a stage area after blending;
a vibration conveying groove is formed between the belt conveyor and the electronic belt scale, the vibration conveying groove is in non-contact with the belt electronic scale and the belt conveyor, and the vibration conveying groove is used for discretely covering the cut stem doped materials conveyed by the electronic belt scale on the main cut tobacco materials conveyed by the belt conveyor;
one end of the belt conveyor is provided with a speed measuring device which is used for detecting the actual running line speed of the conveyor belt of the belt conveyor;
the laser radar is fixed above the belt conveyor through a mounting bracket and is used for detecting the sectional area of a material conveyed by the belt conveyor;
the industrial computer is respectively connected with the laser radar, the speed measuring device, the belt conveyor and the electronic belt scale, and is used for calculating the instantaneous blending proportion variation coefficient and blending precision according to the detection data and adjusting the control instruction in real time according to the calculation result;
the using method comprises the following steps:
detecting the space and the material sectional area of the belt conveyor by a laser radar, and respectively calculating the volume flow before and after blending the cut tobacco by combining the linear speed of the belt conveyor detected by the speed measuring device;
detecting by an electronic belt scale to obtain the mass of the blending material and the instantaneous mass flow of each blending component, and calculating the bulk density and the instantaneous blending proportion of the tobacco shreds before and after blending by combining the volume flow of the tobacco shreds before and after blending;
and according to the instantaneous blending proportion, analyzing and calculating a proportion variation coefficient and a blending precision value in the blending process, and carrying out feedback adjustment on the blending process according to a calculation result.
2. The method of claim 1, wherein the lidar comprises a first lidar disposed in a pre-blending stage region and a second lidar disposed in a post-blending stage region.
3. The method of claim 1, wherein the laser radar end laser scanning area width is equal to a belt width of a belt conveyor.
4. The method of claim 1, wherein the tachometer is a tachometer wheel comprising a roller and a mounting shaft, the mounting shaft being disposed on an inner sidewall of the belt conveyor barrier, the roller being in contact with the belt conveyor belt and maintaining a pressure.
5. The method of claim 2, wherein the apparatus further comprises a material form leveling roller having a length equal to or greater than a belt width of the belt conveyor for leveling a surface morphology of the material to be inspected by the lidar.
6. The method of claim 5, wherein the material leveling roller mainly comprises a stirring roller, a speed reducer and an independent motor, wherein the material leveling roller is connected with the industrial computer, and the rotation speed of the independent motor is adjusted in real time according to the feedback of the first laser radar to the main cut tobacco material detection, so that the rotation speed of the stirring roller is adjusted.
7. The method of claim 6, wherein the pick roller height is lower than the belt conveyor side dams.
8. The method of claim 6, wherein the index roller rotates in the same direction as the material transport direction.
9. The method of claim 6, wherein the speed of rotation of the pick roller is not less than the material transfer speed.
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| CN112903679A (en) * | 2021-01-25 | 2021-06-04 | 安徽中烟工业有限责任公司 | Method for detecting blending proportion and blending uniformity of cut stems of cigarettes based on RGB image processing |
| CN213463807U (en) * | 2020-10-22 | 2021-06-18 | 上海烟草集团有限责任公司 | Tobacco shred blending uniformity detection system |
| CN112985529A (en) * | 2021-02-23 | 2021-06-18 | 中国烟草总公司郑州烟草研究院 | Tobacco material conveying stability detection and control equipment and method based on laser scanning |
| CN113662229A (en) * | 2021-07-14 | 2021-11-19 | 河南中烟工业有限责任公司 | Blending uniformity control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103393209B (en) * | 2013-08-16 | 2016-01-06 | 厦门烟草工业有限责任公司 | The pipe tobacco improving pipe tobacco absorption heat energy and feed liquid efficiency adds material processing device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110514553A (en) * | 2019-09-24 | 2019-11-29 | 中国烟草总公司郑州烟草研究院 | The online test method of pipe tobacco material accumulation density on a kind of conveyer belt |
| CN213463807U (en) * | 2020-10-22 | 2021-06-18 | 上海烟草集团有限责任公司 | Tobacco shred blending uniformity detection system |
| CN112903679A (en) * | 2021-01-25 | 2021-06-04 | 安徽中烟工业有限责任公司 | Method for detecting blending proportion and blending uniformity of cut stems of cigarettes based on RGB image processing |
| CN112985529A (en) * | 2021-02-23 | 2021-06-18 | 中国烟草总公司郑州烟草研究院 | Tobacco material conveying stability detection and control equipment and method based on laser scanning |
| CN113662229A (en) * | 2021-07-14 | 2021-11-19 | 河南中烟工业有限责任公司 | Blending uniformity control method |
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