CN108254281A - A kind of online test method and device of belt feeder material moisture rate - Google Patents
A kind of online test method and device of belt feeder material moisture rate Download PDFInfo
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- CN108254281A CN108254281A CN201611246874.0A CN201611246874A CN108254281A CN 108254281 A CN108254281 A CN 108254281A CN 201611246874 A CN201611246874 A CN 201611246874A CN 108254281 A CN108254281 A CN 108254281A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G9/00—Methods of, or apparatus for, the determination of weight, not provided for in groups G01G1/00 - G01G7/00
- G01G9/005—Methods of, or apparatus for, the determination of weight, not provided for in groups G01G1/00 - G01G7/00 using radiations, e.g. radioactive
Abstract
The present invention relates to a kind of online test method and device of belt feeder material moisture rate, first, Image Acquisition is carried out to being located at the weigh material of section initial position of belt feeder using image collecting device according to predeterminated frequency；Secondly, it weighs segment length requirement when whether the sum of corresponding material forward travel distance of collected material image meets belt feeder, the material actual weight that then control material weighing device acquisition belt feeder is weighed in section, and, according to the corresponding pixel information of surface of material in collected material image and the material butt density demarcated, the dry weight of material in the section of weighing is calculated；According to above-mentioned actual weight and dry weight, material moisture rate is calculated.The present invention calculates its dry weight using the mode for acquiring material image, and material actual mass is directly measured by contact weighing device, so the testing result of the present invention is not limited by the detection of surface of material region moisture content and is not easy to be interfered by external environment.
Description
Technical field
The present invention relates to material online measuring technique field more particularly to a kind of on-line checkings of belt feeder material moisture rate
Method and apparatus.
Background technology
Belt conveyor abbreviation belt feeder as a kind of material conveyor, has been widely used in metallurgical, coal at present
And the every profession and trades such as chemical industry.For example, in sintering production, first, the different material of various composition is sent to by belt feeder mixed
Then material machine, according to the moisture rate of each material, batch mixing is carried out in batch mixer plus after suitable water, finally, the object that will be mixed
Material is sent to sintering machine and carries out material sintering.Since the moisture rate of the mixture in sintering production process can directly influence sinter
Granulating efficiency, therefore, the real-time acquisition of moisture data and analysis work in the material that belt feeder is transported, to guidance sintering life
Production operation plays a very important role.
In the prior art, the detection method of belt feeder material moisture rate mainly has infrared moisture meter detection method and microwave moisture
Two kinds of instrument detection method.Wherein, infrared moisture meter detection method is to utilize absorption of the hydrone to the infrared light of different near infrared bands
For rate difference come what is realized, infrared moisture meter utilizes the principle, and near infrared light is projected on material, reflected by measuring
Light energy calculates the moisture of tested material；And microwave moisture instrument, it is to utilize the low energy microwave of its transmitting through tested material
After middle contained humidity absorbs a part, microwave reflection is detected, so as to fulfill the detection of material moisture.Fig. 1 is belt
The structure diagram of machine material moisture on-line measuring device.As shown in Figure 1, by being installed above the conveyer belt 01 of transported material
Detection probe 02 (infrared probe or microwave probe) distinguishes emission detection signal using detection probe 02 and receives reflection signal,
It is compared and analyzed using the reflection signal received with the reflection signal-moisture rate curve demarcated in advance, realizes conveyer belt
The moisture rate detection of institute's transported material 03 on 01.
But above-mentioned detection probe 02 is mounted on the moisture rate that material 03 is directly detected in 01 top of conveyer belt, can only detect
To material 03 by the moisture rate in the range of near surface smaller area, the moisture rate of all thickness materials, detection can not be detected
As a result accuracy is poor；Also, above-mentioned detection mode is easily by interference such as ambient and steam, to detection environmental requirement compared with
Height, detection stability are poor.
Invention content
To overcome the problems in correlation technique, the present invention provides a kind of on-line checking side of belt feeder material moisture rate
Method and device.
It is according to embodiments of the present invention in a first aspect, provide a kind of online test method of belt feeder material moisture rate, should
Including：
When material enter belt feeder weigh section initial position when, then control image collecting device according to predeterminated frequency to being located at
The belt feeder weigh section initial position material carry out Image Acquisition；
According to the corresponding pixel information of surface of material in collected single frames material image, the single frames material is calculated
The corresponding single frames material dry weight of image；
Judge whether the sum of corresponding material forward travel distance of current collected single frames material image meets the belt
Machine weigh segment length requirement；
If currently the sum of corresponding material forward travel distance of collected single frames material image meets the belt feeder and claims
Weight segment length requirement, then the material actual weight that the control material weighing device acquisition belt feeder is weighed in section；
According to the material actual weight and the corresponding single frames material dry basis of the collected single frames material image
The sum of amount, calculates the material moisture rate that the belt feeder is weighed in section.
Preferably, control image collecting device is weighed the object of section initial position according to predeterminated frequency to being located at the belt feeder
Material carries out Image Acquisition, including：
Laser line light source vertical irradiation is controlled in the surface of material for weighing section initial position positioned at the belt feeder；
Image collecting device is controlled, acquiring the laser line light source according to predeterminated frequency is radiated in the surface of material
Image.
Preferably, according to the corresponding pixel information of surface of material, the acquisition list in collected single frames material image
The butt density of the corresponding material forward travel distance of frame material image and the material, calculates the single frames material image pair
The single frames material dry weight answered, including：
According to the corresponding pixel information of surface of material in collected single frames material image, the single frames is calculated respectively
Charge level width and the corresponding charge level height of each pixel of surface of material in material image；
According to the charge level width and the corresponding charge level height of each surface of material pixel, the single frames material figure is calculated
As corresponding material cross-sectional area；
According to the material cross-sectional area, the corresponding material forward travel distance of the acquisition single frames material image, described in calculating
The corresponding single frames volume of material of single frames material image；
According to the single frames volume of material and the butt density of the material, it is corresponding to calculate the single frames material image
Single frames material dry weight.
Preferably, according to the corresponding pixel information of surface of material in collected single frames material image, material is calculated
The corresponding charge level height of each pixel in surface, including：
Image analysis is carried out to collected single frames material image, obtains the corresponding pixel of surface of material in the single frames
Actual pixels point position in material image；
According to the actual pixels point position and well-established charge level height and the correspondence of pixel position,
Calculate the corresponding charge level height of each pixel of surface of material.
Preferably, it according to the corresponding pixel information of surface of material in collected single frames material image, calculates described
Charge level width in single frames material image, including：
Image analysis is carried out to collected single frames material image, obtains the corresponding material of material width in the single-frame images
The face pixel quantity N and corresponding belt pixel quantity P of belt feeder conveyer belt；
According to the practical width of the charge level pixel quantity N, the belt pixel quantity P and the belt feeder conveyer belt
W is spent, calculates the charge level width D in the single frames material image, wherein,
Preferably, the computational methods for acquiring the corresponding material forward travel distance of the single frames material image include：
Obtain the instantaneous velocity V of the conveyer belt operation of belt feeder when acquiring the single frames material imagem；
According to the predeterminated frequency f and the instantaneous velocity Vm, calculate the corresponding object of the acquisition single frames material image
Expect forward travel distance lm, wherein, lm=Vm/f。
Preferably, judge whether the sum of corresponding material forward travel distance of collected single frames material image meets the skin
Band machine weigh segment length requirement, including：
Judge whether the sum of corresponding material forward travel distance of collected single frames material image meets relational expressionWherein, lmFor the corresponding material forward travel distance of acquisition single frames material image, M is the image collected frame
Number, L weigh segment length for belt feeder.
Preferably, the computational methods of the sum of single frames material dry weight of the collected material image include：
Wherein, M is the image collected frame number, lmFor
Acquire the corresponding material forward travel distance of m frame material images, smM frame material image corresponding material cross-sectional areas, s11st frame object
Expect image corresponding material cross-sectional area, L weighs segment length for belt feeder, ρdryButt density for the material.
Second aspect according to embodiments of the present invention provides a kind of on-line measuring device of belt feeder material moisture rate,
This includes：
Image collecting device, for material enter belt feeder weigh section initial position when, according to predeterminated frequency to being located at
The belt feeder weigh section initial position material carry out Image Acquisition；
Material metage device, for acquiring the material actual weight that the belt feeder is weighed in section；
Central processing unit communicates to connect respectively with described image harvester and material metage device, wherein, the center
Processor is used for：
When material enter belt feeder weigh section initial position when, then control image collecting device according to predeterminated frequency to being located at
The belt feeder weigh section initial position material carry out Image Acquisition；
According to the corresponding pixel information of surface of material in collected single frames material image, the single frames material is calculated
The corresponding single frames material dry weight of image；
Judge whether the sum of corresponding material forward travel distance of current collected single frames material image meets the belt
Machine weigh segment length requirement；
If currently the sum of corresponding material forward travel distance of collected single frames material image meets the belt feeder and claims
Weight segment length requirement, then the material actual weight that the control material weighing device acquisition belt feeder is weighed in section；
According to the material actual weight and the corresponding single frames material dry basis of the collected single frames material image
The sum of amount, calculates the material moisture rate that the belt feeder is weighed in section.
Preferably, the material metage device includes laser line light source and industrial camera, wherein：
The laser line light source is arranged on the belt feeder and weighs the surface of section initial position, for by the laser emitted
Line vertical irradiation is in the surface of material for weighing section initial position positioned at the belt feeder；
The industrial camera is arranged on above the belt feeder, for acquiring the laser line light source according to predeterminated frequency
The image being radiated in the surface of material.
Preferably, described device further includes material shaping cover, wherein：
The material shaping cover is arranged on the belt feeder and weighs the front of section initial position, for claiming into belt feeder
The surface of material shape of weight section initial position is modified.
By above technical scheme as it can be seen that a kind of on-line checking side of belt feeder material moisture rate provided in an embodiment of the present invention
Method and device, first, using image collecting device according to predeterminated frequency to be located at belt feeder weigh section initial position material into
Row Image Acquisition；Secondly, it weighs segment length when the sum of corresponding material forward travel distance of collected material image meets belt feeder
Degree requirement, then the material actual weight that control material weighing device acquisition belt feeder is weighed in section, and according to collected list
The corresponding pixel information of surface of material and the physics butt density demarcated, calculate the belt feeder in frame material image
Material dry weight in section of weighing；According to the actual weight and dry weight of material, the material moisture rate is calculated.Due to this reality
It applies in example and calculates material dry weight, and the actual mass of material is connects using the mode of camera image acquisition material image
Touch weighing device is directly measured, and then can accurately measure the wet weight of all bed depths, and is not limited to
The detection of surface of material region moisture content and the interference for being not susceptible to external environment, so the testing result of the present embodiment is more steady
It is fixed, accurate.
It should be understood that above general description and following detailed description are only exemplary and explanatory, not
It can the limitation present invention.
Description of the drawings
Attached drawing herein is incorporated into specification and forms the part of this specification, shows the implementation for meeting the present invention
Example, and be used to explain the principle of the present invention together with specification.
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, without having to pay creative labor, can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is the structure diagram of belt feeder material moisture on-line measuring device of the prior art；
Fig. 2 is that a kind of hardware configuration of belt feeder material moisture on-line measuring device provided in an embodiment of the present invention is illustrated
Figure；
Fig. 3 is hardware organization's block diagram of belt feeder material moisture on-line measuring device provided in an embodiment of the present invention；
Fig. 4 is the schematic diagram of contactless volume of material detection part provided in an embodiment of the present invention
Fig. 5 is a kind of flow diagram of belt feeder material moisture online test method provided in an embodiment of the present invention；
Fig. 6 is the principle schematic that charge level height provided in an embodiment of the present invention is demarcated and detected；
Fig. 7 is the computational methods schematic diagram of material width provided in an embodiment of the present invention and cross-sectional area；
Fig. 8 is the computational methods schematic diagram of volume of material provided in an embodiment of the present invention.
Specific embodiment
Here exemplary embodiment will be illustrated in detail, example is illustrated in the accompanying drawings.Following description is related to
During attached drawing, unless otherwise indicated, the same numbers in different attached drawings represent the same or similar element.Following exemplary embodiment
Described in embodiment do not represent and the consistent all embodiments of the present invention.On the contrary, they be only with it is such as appended
The example of the consistent device and method of some aspects being described in detail in claims, of the invention.
For existing for the on-line measuring device of belt feeder material moisture rate of the prior art detect stability difference and
The problem of testing result accuracy is poor, an embodiment of the present invention provides a kind of online test methods of belt feeder material moisture rate
And device, the cardinal principle of the detection method are to detect that belt feeder is weighed in section using contactless volume of material detection unit
The volume of material according to the volume detected and the material butt density demarcated, can calculate the dry basis of material
Amount, meanwhile, detect that belt feeder is weighed the actual weight of material in section using material metage device, according to the reality of above-mentioned material
Weight and dry weight calculate the moisture rate of material.
Fig. 2 is that a kind of hardware configuration of belt feeder material moisture on-line measuring device provided in an embodiment of the present invention is illustrated
Figure.Fig. 3 is hardware organization's block diagram of belt feeder material moisture on-line measuring device provided in an embodiment of the present invention.Such as Fig. 2 and Fig. 3
Shown, which mainly includes central processing unit 4 and the image collecting device 3 and material that are communicated to connect with central processing unit 4
Weighing device 5.
Wherein, material metage device 5 mainly includes weighing carrier roller 51, weighing sensor 52 and microprocessor 53 of weighing.Claim
Great trust roller 51 sets the lower section of belt feeder conveyer belt 10, for supporting the material 20 of the transmission of conveyer belt 10, and the weighing carrier roller
Material gravity in determining length range inner belt can be passed to weighing sensor 52 by 51, and the embodiment of the present invention determines this
Length range is known as belt feeder and weighs a section L, also, in material direction of advance, and weigh two edges of section L of belt feeder are distinguished
Referred to as belt feeder weighs section initial position A and belt feeder is weighed a section end position B.
In 5 course of work of material metage device, active force is added to support of weighing by weight of material by the belt feeder section L that weighs
On roller 51, weighing carrier roller 51 is again by the force transfer to weighing sensor 52, and 52 output voltage signal of weighing sensor is simultaneously
After amplifying by signal, microprocessor 53 of weighing is transferred to, weighs microprocessor 53 after corresponding series of computation,
With the actual weight for section L that obtains weighing in belt feeder in relation to material, and the actual weight is sent to central processing unit 4.
Image collecting device 3, for when material 20 weighs section initial position A into belt feeder, according to predeterminated frequency pair
Image Acquisition is carried out positioned at the weigh material of section initial position A of the belt feeder, and the image of acquisition is sent to central processing unit
4, central processing unit 4, can by calculating the corresponding pixel information analysis of surface of material in collected material image
Obtain the charge level height of material reality and material width in acquisition image.
In order to facilitate identification of the central processing unit 4 for surface of material corresponding pixel points in material image, the embodiment of the present invention
Middle image collecting device 3 mainly includes industrial camera 31 and laser line light source 32, wherein, laser line light source 32 is arranged on belt
Machine is weighed a section surface of initial position A, for the laser rays vertical irradiation of transmitting to be weighed a section start bit positioned at belt feeder
It puts in the surface of material of A；Industrial camera 31 is arranged on above belt feeder, and the Image Acquisition direction of the industrial camera with
Positioned at belt feeder weigh section initial position A surface of material vertical line have certain angle, for according to predeterminated frequency acquire swash
Light light source 32 is radiated at the image in surface of material, and central processing unit 4 acquires laser spot positions in image by extraction, just
The charge level height of material reality and material width can be calculated.
Fluctuation to prevent surface of material pattern is excessive, and difficulty, the present embodiment are brought to the image analysis of central processing unit 4
In, shaping cover 60 is additionally provided with (i.e. on supplied materials direction) in the weigh front of section initial position of the belt feeder, the shaping cover 60
The contactless material body in on-line measuring device provided in an embodiment of the present invention is together constituted with above-mentioned image collecting device 3
Product detection part.
As shown in figure 4, the schematic diagram for contactless volume of material detection part provided in an embodiment of the present invention, in material
Before weighing section initial position into belt feeder, surface of material shape is modified by shaping cover 60, after then trimmed
Material enter belt feeder weigh section initial position when, then industrial camera 31, which starts to capture laser line light source 32, is radiated at material table
Image during face.
Central processing unit 4 is applied not only to receive the weight data and figure that image collecting device 3 and material metage device 5 are sent
As data, enabled image collecting device 3 and material metage device 5 are additionally operable to, image collecting device 3 and material metage to be controlled to fill
Put 5 specific work process.
Fig. 5 is a kind of flow diagram of belt feeder material moisture online test method provided in an embodiment of the present invention.Fig. 5
The executive agent of shown method is central processing unit shown in Fig. 2, and described method includes following steps by Fig. 5：
S110：When material enter belt feeder weigh section initial position when, then control image collecting device according to predeterminated frequency
To be located at the belt feeder weigh section initial position material carry out Image Acquisition.
Specifically, first, control laser line light source vertical irradiation is in the material table for section initial position of weighing positioned at belt feeder
On face, certainly, the laser line light source can maintain a normally open state；Then, control image collecting device is adopted according to predeterminated frequency
Collect the image that the laser line light source is radiated in surface of material, wherein, the predeterminated frequency can be that image collecting device is adopted
Collect a frame image required time corresponding frequency or harvester be according to material moisture rate computational accuracy needs,
The frequency independently set, if for example, requiring relatively low, frequency acquisition can be set low one to material moisture rate computational accuracy
A bit, that is, sampling number is reduced.
S120：According to the corresponding pixel information of surface of material in collected single frames material image, the list is calculated
The corresponding single frames material dry weight of frame material image.
Specifically it may include steps of：
S121：According to the corresponding pixel information of surface of material in collected single frames material image, institute is calculated respectively
State charge level width and the corresponding charge level height of each pixel of surface of material in single frames material image.
Wherein, according to the corresponding pixel information of surface of material in collected single frames material image, single frames object is calculated
Expect the corresponding charge level height of each pixel of surface of material in image, can include：
1) image analysis is carried out to collected single frames material image, obtains the corresponding pixel of surface of material in the list
Actual pixels point position in frame material image.
The pixel value of each pixel and position analysis, obtain surface of material in being carried out to collected single frames material image
Actual pixels point position of the corresponding pixel in the single frames material image, for example, when laser line light source is used to irradiate material
During surface, then the position of luminous point in the picture in image is acquired.
2) it is closed according to the actual pixels point position and well-established charge level height are corresponding with pixel position
System, calculates the corresponding charge level height of each pixel of surface of material.
As shown in fig. 6, demarcating the principle schematic with detecting for charge level height provided in an embodiment of the present invention, expected
It is first, sharp by being stood on vertically for the graduated scale 23 of calibration when face height is demarcated with surface of material pixel position relationship
At the underface of light light source 32, i.e. belt feeder weighing section initial position A, and with the collected scale at this time of industrial camera 31
The image of ruler 23 is as calibration material.Due to representing the pixel point coordinates one of this scale in graduated scale high scale in image and image
One corresponds to, so as to set up the correspondence of charge level height and pixel, and then, in actually measuring, according to laser rays in object
The coordinate position of incident point pixel in just image formed on material surface, can obtain corresponding charge level height, for example, figure
N points and m points in 6 can respectively obtain its location point h (n), h (m) according to correspondence.
Further, according to the corresponding pixel information of surface of material in collected single frames material image, institute is calculated
Charge level width in single frames material image is stated, can be included：
1) image analysis is carried out to collected single frames material image, it is corresponding obtains material width in the single-frame images
The charge level pixel quantity N and corresponding belt pixel quantity P of belt feeder conveyer belt.
2) according to the reality of the charge level pixel quantity N, the belt pixel quantity P and the belt feeder conveyer belt
Width W calculates the charge level width D in the single frames material image, wherein,
S122：According to the charge level width and the corresponding charge level height of each surface of material pixel, the single frames is calculated
Material image corresponding material cross-sectional area.
As shown in fig. 7, the pixel number N according to corresponding to charge level width in the charge level width D and image, then image
Developed width corresponding to each upper pixelThen, according to the corresponding charge level height of each surface of material pixel
H (n) can then calculate each surface of material pixel corresponding material area as h (n) * △ d, by all materials surface pixels point
Corresponding material area accumulation can obtain the cross-sectional area of material in image
S123：According to the material cross-sectional area, the corresponding material forward travel distance of the acquisition single frames material image, calculate
The corresponding single frames volume of material of the single frames material image.
Wherein, the computational methods for acquiring the corresponding material forward travel distance of the single frames material image include：
First, belt feeder conveyer belt is obtained in the image acquisition device single frames material image, corresponding operation wink
Shi Sudu Vm, then, according to the predeterminated frequency of image acquisition device material image in step S110, figure can be calculated
As to the corresponding acquisition time of single frames material image (time interval between i.e. adjacent two field pictures)Finally, according to
Above-mentioned instantaneous velocity vmWith acquisition time Δ t, when can calculate image to single frames material Image Acquisition before corresponding material
Into distance lm, wherein, lm=vm* Δ t=vm/f。
By it is above-mentioned calculate material forward travel distance after, material cross-sectional area S and material forward travel distance l in imagemMultiply
Product, is just the volume of material V in single frames material imagem。
S124：According to the single frames volume of material and the butt density of the material, the single frames material image is calculated
Corresponding single frames material dry weight.
According to quality calculation formula, by single frames volume of material VmWith the butt density p of the materialdryProduct is carried out, it can
Calculate the corresponding single frames material dry weight m of the single frames material imagem。
S130：It is described to judge whether the sum of corresponding material forward travel distance of current collected single frames material image meets
Belt feeder weigh segment length requirement.
In the initial state, i.e., material have just enter into belt feeder weigh section initial position when, set material forward travel distance as 0,
Accumulative frequency M often acquires a frame image also for 0, and material forward travel distance is added up lm, and M increases by 1, then acquires M frame images
Afterwards, the sum of corresponding material forward travel distance is just
By judging the sum of corresponding material forward travel distance of collected single frames material image at present, if meet relationship
FormulaTo judge whether the sum of the corresponding material forward travel distance of current collected single frames material image is full
The foot belt feeder is weighed segment length requirement, that is, judges whether the corresponding material of first frame image of acquisition has run belt feeder and has claimed
At weight section end position, whenThen continue the Image Acquisition of next frame, and M is added up 1, closed until meeting
It is formulaWhen meeting relational expressionThen illustrate the corresponding material of first frame image of acquisition
It has run belt feeder to weigh at section end position, has then performed step S140.
S140：If currently the sum of corresponding material forward travel distance of collected single frames material image meets the belt
Machine is weighed segment length requirement, then control material weighing device acquires the material actual weight M that the belt feeder is weighed in sectionwet。
S150：It is done according to the material actual weight and the corresponding single frames material of the collected single frames material image
The sum of base weight amount calculates the material moisture rate that the belt feeder is weighed in section.
Material image (has been collected corresponding to belt according to the sum of single frames material dry weight for having collected material image
Machine is weighed the material dry weight in section)The material actual weight M to weigh with belt feeder in sectionwetIt can count
The moisture rate of the material in the material metage section is calculated, specific formula is：
As shown in figure 8, the computational methods schematic diagram for volume of material provided in an embodiment of the present invention.Since the present invention is implemented
The corresponding material forward travel distance of the frame image is then added to sequence by example using a frame image is often acquiredSo acquiring
M frame images in, most start acquisition the corresponding material length of first frame image (i.e. material forward travel distance) l1It might have one
Part is located at except the segment length L that weighs, i.e.,So material butt calculated on section L for belt feeder is made to weigh
Weight is more accurate, and an embodiment of the present invention provides weighing on section L for belt feeder, the corresponding material of first frame acquisition image is long
Spend l1Computational methods, i.e.,It is corresponding, belt feeder weigh the volume V of material on section L calculation formula just
For：
In formula (2), lmFor the corresponding material forward travel distance of acquisition m frame material images, smM frame materials image corresponds to
Material cross-sectional area, s11st frame material image corresponding material cross-sectional area.
Corresponding, according to formula (2), the calculation formula of the dry weight of material is in material metage section：
So moisture rate of the formula (1) about the material in material metage section, is changed to accordingly：
After execution of step S150, can return to step S110, continue to next material into material metage section into
Row moisture rate detects, therefore, using the above method, can to each section on belt feeder by material machine weigh section material into
Row material moisture rate detects, and then, the moisture rate of all segmentation materials detected average after operation, Jin Erke
To calculate the moisture rate of institute's transported material on belt feeder.
Material detection method provided in an embodiment of the present invention, according to the work characteristics of transport of the material on belt feeder, profit
With contactless volume detection device, the dry weight of material on belt feeder is calculated；And the material metage using contact
Device directly detects the actual mass of material, finally, according to above-mentioned material actual weight and dry weight, can accurately survey
The wet weight of all bed depths is measured, and is not limited to the detection of surface of material region moisture content；In addition, in the present embodiment
Volume of material is calculated using the mode of industrial camera acquisition material image, industrial camera is not easy to by external environment
Interference, and the detection mode that the actual mass of material is contact, therefore, the testing result of the present embodiment are more stable, smart
Really.
It should be noted that material moisture rate detection method and device provided in an embodiment of the present invention, however it is not limited to be sintered
Production, other all belt feeders or similar device can all be applied.
Each embodiment in this specification is described by the way of progressive, identical similar portion between each embodiment
Point just to refer each other, and the highlights of each of the examples are difference from other examples.Especially for device reality
For applying example, since it is substantially similar to embodiment of the method, so describing fairly simple, related part is referring to embodiment of the method
Part explanation.
Those skilled in the art will readily occur to the present invention its after considering specification and putting into practice the invention invented here
Its embodiment.This application is intended to cover the present invention any variations, uses, or adaptations, these modifications, purposes or
Person's adaptive change follows the general principle of the present invention and the common knowledge in the art do not invented including the present invention
Or conventional techniques.Description and embodiments are considered only as illustratively, and true scope and spirit of the invention are by following
Claim is pointed out.
It should be understood that the invention is not limited in the precision architecture for being described above and being shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present invention is only limited by appended claim.
Claims (11)
1. a kind of online test method of belt feeder material moisture rate, which is characterized in that including：
When material enter belt feeder weigh section initial position when, then control image collecting device described to being located at according to predeterminated frequency
Belt feeder weigh section initial position material carry out Image Acquisition；
According to the corresponding pixel information of surface of material in collected single frames material image, the single frames material image is calculated
Corresponding single frames material dry weight；
Judge whether the sum of corresponding material forward travel distance of current collected single frames material image meets the belt feeder and claim
Weight segment length requirement；
If the sum of corresponding material forward travel distance of current collected single frames material image meets the belt feeder and weighs section
Length requirement, then the material actual weight that the control material weighing device acquisition belt feeder is weighed in section；
According to the material actual weight and the corresponding single frames material dry weight of the collected single frames material image it
With calculate the material moisture rate that the belt feeder is weighed in section.
2. according to the method described in claim 1, it is characterized in that, control image collecting device according to predeterminated frequency to being located at
State belt feeder weigh section initial position material carry out Image Acquisition, including：
Laser line light source vertical irradiation is controlled in the surface of material for weighing section initial position positioned at the belt feeder；
Image collecting device is controlled, the figure being radiated at according to the predeterminated frequency acquisition laser line light source in the surface of material
Picture.
3. according to the method described in claim 1, it is characterized in that, according to surface of material pair in collected single frames material image
The pixel information answered calculates the corresponding single frames material dry weight of the single frames material image, including：
According to the corresponding pixel information of surface of material in collected single frames material image, the single frames material is calculated respectively
Charge level width and the corresponding charge level height of each pixel of surface of material in image；
According to the charge level width and the corresponding charge level height of each surface of material pixel, the single frames material image pair is calculated
Answer material cross-sectional area；
According to the material cross-sectional area, the corresponding material forward travel distance of the acquisition single frames material image, the single frames is calculated
The corresponding single frames volume of material of material image；
According to the single frames volume of material and the butt density of the material, the corresponding single frames of the single frames material image is calculated
Material dry weight.
4. according to the method described in claim 3, it is characterized in that, according to surface of material pair in collected single frames material image
The pixel information answered calculates the corresponding charge level height of each pixel of surface of material, including：
Image analysis is carried out to collected single frames material image, obtains the corresponding pixel of surface of material in the single frames material
Actual pixels point position in image；
According to the actual pixels point position and well-established charge level height and the correspondence of pixel position, calculate
Go out the corresponding charge level height of each pixel of surface of material.
5. according to the method described in claim 3, it is characterized in that, according to surface of material pair in collected single frames material image
The pixel information answered calculates the charge level width in the single frames material image, including：
Image analysis is carried out to collected single frames material image, obtains the corresponding charge level picture of material width in the single-frame images
The vegetarian refreshments quantity N and corresponding belt pixel quantity P of belt feeder conveyer belt；
According to the developed width W of the charge level pixel quantity N, the belt pixel quantity P and the belt feeder conveyer belt,
The charge level width D in the single frames material image is calculated, wherein,
6. according to the method described in claim 1, it is characterized in that, acquire the corresponding material of the single frames material image advance away from
From computational methods include：
Obtain the instantaneous velocity V of the conveyer belt operation of belt feeder when acquiring the single frames material imagem；
According to the predeterminated frequency f and the instantaneous velocity Vm, calculate the corresponding material of the acquisition single frames material image and advance
Distance lm, wherein, lm=Vm/f。
7. according to the method described in claim 1, it is characterized in that, judge that current collected single frames material image is corresponding
The sum of material forward travel distance whether meet the belt feeder weigh segment length requirement, including：
Judge whether the sum of corresponding material forward travel distance of current collected single frames material image meets relational expressionWherein, lmFor the corresponding material forward travel distance of acquisition single frames material image, M is the image collected frame
Number, L weigh segment length for belt feeder.
8. the according to the method described in claim 1, it is characterized in that, single frames material butt of the collected material image
The computational methods of the sum of weight include：
Wherein, M is the image collected frame number, lmFor acquisition
The corresponding material forward travel distance of m frame material images, smM frame material image corresponding material cross-sectional areas, s11st frame material figure
As corresponding material cross-sectional area, L weighs segment length for belt feeder, ρdryButt density for the material.
9. a kind of on-line measuring device of belt feeder material moisture rate, which is characterized in that including：
Image collecting device, for material enter belt feeder weigh section initial position when, it is described to being located at according to predeterminated frequency
Belt feeder weigh section initial position material carry out Image Acquisition；
Material metage device, for acquiring the material actual weight that the belt feeder is weighed in section；
Central processing unit communicates to connect respectively with described image harvester and material metage device, wherein, the central processing
Device is used for：
When material enter belt feeder weigh section initial position when, then control image collecting device described to being located at according to predeterminated frequency
Belt feeder weigh section initial position material carry out Image Acquisition；
According to the corresponding pixel information of surface of material in collected single frames material image, the single frames material image is calculated
Corresponding single frames material dry weight；
Judge whether the sum of corresponding material forward travel distance of current collected single frames material image meets the belt feeder and claim
Weight segment length requirement；
If the sum of corresponding material forward travel distance of current collected single frames material image meets the belt feeder and weighs section
Length requirement, then the material actual weight that the control material weighing device acquisition belt feeder is weighed in section；
According to the material actual weight and the corresponding single frames material dry weight of the collected single frames material image it
With calculate the material moisture rate that the belt feeder is weighed in section.
10. device according to claim 9, which is characterized in that the material metage device includes laser line light source and work
Industry video camera, wherein：
The laser line light source is arranged on the belt feeder and weighs the surface of section initial position, for the laser rays of transmitting to be hung down
Directly it is radiated in the surface of material that the belt feeder weighs section initial position；
The industrial camera is arranged on above the belt feeder, is irradiated for acquiring the laser line light source according to predeterminated frequency
Image in the surface of material.
11. device according to claim 9, which is characterized in that described device further includes material shaping cover, wherein：
The material shaping cover is arranged on the belt feeder and weighs the front of section initial position, for weighing section into belt feeder
The surface of material shape of initial position is modified.
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