CN205506179U - Image belt weigher detection device - Google Patents
Image belt weigher detection device Download PDFInfo
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- CN205506179U CN205506179U CN201521081323.4U CN201521081323U CN205506179U CN 205506179 U CN205506179 U CN 205506179U CN 201521081323 U CN201521081323 U CN 201521081323U CN 205506179 U CN205506179 U CN 205506179U
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- 238000001514 detection method Methods 0.000 title claims abstract description 41
- 239000000463 material Substances 0.000 claims abstract description 117
- 238000004891 communication Methods 0.000 claims description 16
- 238000005259 measurement Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 238000003709 image segmentation Methods 0.000 description 8
- 238000009434 installation Methods 0.000 description 7
- 238000009825 accumulation Methods 0.000 description 6
- 239000003086 colorant Substances 0.000 description 4
- 238000000205 computational method Methods 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 230000011218 segmentation Effects 0.000 description 4
- 230000001502 supplementing effect Effects 0.000 description 4
- 230000032258 transport Effects 0.000 description 4
- 239000002817 coal dust Substances 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 230000002285 radioactive effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241000222065 Lycoperdon Species 0.000 description 1
- 241000768494 Polymorphum Species 0.000 description 1
- 230000003471 anti-radiation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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Abstract
The utility model relates to an image belt weigher detection device belongs to material flow measurement technical field. Install the tachymeter among this image belt weigher detection device in the roller pivot, from lower supreme being equipped with in proper order guide, line source, roller output is rectified the front upper place and is equipped with the camera directly over the roller top, and the camera passes through image gathering module to be connected with the host computer, and the line source passes through digital output module to be connected with the host computer, and line light exposure is at the material at roller top and demonstrate the characteristic light belt according to the marginal appearance in surface. The device does not receive length to transfinite, have the influence of factors such as curve segment, off tracking, tension change, has to detect the advantage that the precision is higher, adaptability is stronger.
Description
Technical field
The present invention relates to a kind of image belt conveyer scale detection device, belong to mass flow detection technique field.
Background technology
At present, detection method and the device of travelling belt mass flow mainly has belted electronic balance and controlled nucleon operated belt conveyor scale.Belted electronic balance is by weighing the weight of certain length travelling belt, and combines the speed calculation mass flow of travelling belt；When the r ray that controlled nucleon operated belt conveyor scale then utilizes radiosiotope to produce penetrates material, the characteristic that r ray attenuation amount is relevant with material thickness, by measuring the residue intensity of r ray and combining travelling belt speed and calculate mass flow.Belted electronic balance accuracy of detection easily by travelling belt length, have the factors such as curved section, sideslip, tension variation to be affected, the use condition of belted electronic balance requires more harsh, travelling belt is oversize or the shortest being unsuitable for uses belted electronic balance, travelling belt has curved section to will also result in bigger detection error, some travelling belts easily occur that sideslip or tension variation are relatively big, cause detection error even cannot normally detect very greatly.The radioactive source that controlled nucleon operated belt conveyor scale uses is mainly point type or wire type, although controlled nucleon operated belt conveyor scale is not by Belt Length, the factor such as belt deviation or tension variation affects, but owing to attenuation when r ray penetrates material becomes logarithmic relationship with material thickness, when tested material cross sectional shape or material distribution consistency degree frequently change, attenuation degree after r ray penetrates material even if quality of material is identical also has very big difference, thus cause the biggest detection error, therefore, travelling belt material cross sectional shape is changed greatly or material situation pockety, controlled nucleon operated belt conveyor scale can not normally use.
Summary of the invention
For overcoming belted electronic balance to be transfinited by the length of travelling belt, having the factors such as curved section, sideslip, tension variation to be affected, and controlled nucleon operated belt conveyor scale is easily by the change of material cross sectional shape or material is pockety affects, the present invention provides a kind of image belt conveyer scale detection device.This image belt conveyer scale detection apparatus and method are not affected by above-mentioned factor, have the advantage that accuracy of detection is higher, adaptability is higher, and the present invention is achieved through the following technical solutions.
nullA kind of image belt conveyer scale detection device，Including main frame 1、Image capture module 2、Photographic head 3、Contrast chi 4、Line source 5、Feature light belt 6、Belt 8、Tachymeter 9、Roller 10 and digital quantity output module 11，Described roller 10 is provided with belt 8，Tachymeter 9 is installed in roller 10 rotating shaft，Contrast chi 4 it is sequentially provided with from bottom to up directly over roller 10 top、Line source 5，Contrast chi 4 is band color、The ruler that horizontal direction is rectangular with vertical direction，Line source 5 is directional light，Roller 10 output is rectified the side of going forward and is provided with photographic head 3，Photographic head 3 according to the height of material 7 with belt 8 in 6 °～15 ° (to guarantee that the image obtained can include roller 10 top half、Material 7 above roller 10、Contrast chi 4 and feature light belt 6)，Tachymeter 9 connects the usb communication mouth of main frame 1 by holding wire，Photographic head 3 is connected with main frame 1 by image capture module 2，Line source 5 is connected with main frame 1 by digital output module 11，Line source 5 is radiated at the material 7 at roller 10 top and presents feature light belt 6 according to marginal surface pattern.Use contrast chi 4 as the calculating standard of image pixel Yu actual size, the no matter change such as the position distance height of photographic head 3 or angle deviating, all the time can determine that the corresponding relation of image pixel and actual size, contrast chi 4 is square, its cross-directional length is suitable with roller 10, vertical-direction length is slightly larger than material 7 maximum height, and contrast chi 4 color has the biggest contrast with ambient color.
Described image capture module 2 passes through ethernet communication with main frame 1.
Line source 5 is colored directional light, material 7 is formed elongated feature light belt 6, it is derived from accurate material cross section contour, it is to avoid front and back image is overlapping and affect the acquisition in accurate material cross section, and the color of feature light belt 6 and other object colors have the biggest contrast.
Described photographic head 3 is periodicity image pickup mode, and main frame 1 obtains digital picture and the speed data of tachymeter 9 the most simultaneously.
The detection method of above-mentioned image belt conveyer scale detection device:
A () main frame 1 is opened and closed by digital output module 11 control line light source 5；
B () photographic head 3 periodically obtains the image at travelling belt 8 delivery bowl 10, digital picture passed in main frame 1 by image capture module 2, and digital picture stored in the internal memory of main frame 1；
C () detects the speed of travelling belt 8 with tachymeter 9, and collected in main frame 1 by holding wire；
In d image that () step (b) collects, feature light belt 6 connection formed on material 7 both sides belt 8 by line source 5 obtains supplementing line 12, and with supplementary line 12 as lower boundary, line source 5 be radiated at feature light belt 6 that the material 7 at roller 10 top formed as coboundary, obtain material by Digital Image Segmentation and split Figure 13, and split the real area corresponding for Figure 13 area of section as actual material using material；Big with the pixel contrast of other parts image owing to the image that collects contrasting chi 4 image, obtain contrast chi by Digital Image Segmentation and split Figure 14；
E contrast chi that () obtains according to step (d) splits Figure 14, according to the physical length horizontally and vertically that contrast chi is actual, and contrast chi pixel horizontally and vertically, being calculated contrast physical length corresponding to chi unit picture element horizontally and vertically, both are multiplied real area corresponding to unit of account pixel；
F () splits Figure 13 according to the material that step (d) obtains and tries to achieve the total pixel number of material cross-sectional image, total pixel number is multiplied by the real area that step (e) unit picture element is corresponding, tries to achieve the actual cross-section area of material；
G () uses belt idle running calibration material sectional area side-play amount S0, belt 8 unloaded row travelling belt several weeks, system obtains the material sectional area S in during this period of timei, wherein i=1～J, J are calculating periodicity during this period of time, according to formulaCalculate material sectional area side-play amount S0；
H () is according to formula Q=KdV (S-S0) calculate the mass flow in each detection cycle, wherein Q is mass flow, and unit is kg/s；K is discharge coefficient；D is solid accumulation density, and unit is kg/m3；S is the material sectional area that step (e) is tried to achieve, and unit is m2；V is belt speed, and unit is m/s；Material sectional area side-play amount S0, unit is m2。
When the mass flow that described step (h) calculates and actual mass flow have deviation, matching type calibrated fluxes coefficient in kind is used to obtain KSchool, recalculate and obtain mass flow:
I () calculates mass flow accumulated value: assume that, within the time of N number of calculating cycle T, the sectional area obtained respectively is Si, unit is m2, it is thus achieved that belt speed be Vi, unit is m/s, and wherein i=1～N represents from starting the accumulation periodicity to end accumulation, QiRepresent the mass flow that each calculating computation of Period obtains, then the computing formula of the mass flow accumulated value W within the time of N number of calculating cycle T is:
Material sectional area side-play amount S0The average cross-section tried to achieve by step (g)；SiThe actual cross-section area of material in the i-th cycle is tried to achieve by step (a) to (f)；K is discharge coefficient, and value is 1 for the first time, after value be previous calibrated discharge coefficient value；
J flow coefficient k is corrected by ():
1. the material w of known quality is weighed1, this material is carried detection by travelling belt 8, tries to achieve this material through step (a) to (f) travelling belt 8 has carried, obtain the actual cross-section area S in n calculating cycle1～SnWith belt speed V1～Vn；
2. the mass flow accumulated value W tried to achieve according to step (i), tries to achieveIt is calculated new flow coefficient kSchool；
K K that () will be tried to achieve through step (j)SchoolIt is brought into formula Q=KSchooldV(S-S0), calculate the mass flow in each detection cycle, wherein Q is mass flow, and unit is kg/s；KSchoolFor the discharge coefficient after correction；D is solid accumulation density, and unit is kg/m3；S is the material sectional area that step (e) is tried to achieve, and unit is m2；V is belt speed, and unit is m/s；Material sectional area side-play amount S0, unit is m2。
The invention has the beneficial effects as follows:
1 compares with existing belted electronic balance, the accuracy of detection of the present invention not by travelling belt length, have the factors such as curved section, sideslip, tension variation to be affected, precision is higher, and adaptability is higher.
2 compare with controlled nucleon operated belt conveyor scale, and the present invention is not changed by material cross sectional shape or material is pockety affects, it is not necessary to radioactive source, it is not necessary to Anti-Radiation Countermeasures, uses safer environmental protection, installs more convenient, and manufacturing cost and use cost are the lowest.
3, carry out mass flow detection by image, it is possible to achieve the non-contact detection of travelling belt mass flow, be therefore applicable to the occasions such as temperature is high, corrosivity is strong.
4, the mass flow of the travelling belt that the present invention is applicable not only to routine detects, it is also possible to be applicable to the mass flow detection of other material mode of movement (such as chain plate conveyor belt).
Accompanying drawing explanation
Fig. 1 is image belt conveyer scale structure of the detecting device schematic diagram of the present invention；
Fig. 2 is the inventive method schematic flow sheet；
Fig. 3 is the side schematic view of image belt conveyer scale of the present invention detection device；
Fig. 4 is the digital picture figure that the present invention detects that device obtains；
Fig. 5 be the present invention detect device obtain digital picture improve replacement company's line chart；
Fig. 6 is material segmentation figure of the present invention；
Fig. 7 is that the present invention contrasts chi segmentation figure.
In figure: 1-main frame, 2-image capture module, 3-photographic head, 4-contrasts chi, 5-line source, 6-feature light belt, 7-material, 8-belt, 9-tachymeter, 10-roller, 11-digital output module, and 12-supplements line, 13-material segmentation figure, 14-contrast chi segmentation figure.
Detailed description of the invention
Below in conjunction with the accompanying drawings and detailed description of the invention, the invention will be further described.
Embodiment 1
Detecting to the Ore flow of barrow band certain copper ore dressing factory grinding operation, ore grain size is below 12mm, and belt width is 500mm, and belt speed scope is 0.9～1.1m/s, and the bulk density of Ore is 2130kg/m3, Ore color is Lycoperdon polymorphum Vitt.
nullAs shown in Figure 1，This image belt conveyer scale detection device，Including main frame 1、Image capture module 2、Photographic head 3、Contrast chi 4、Line source 5、Feature light belt 6、Belt 8、Tachymeter 9、Roller 10 and digital quantity output module 11，Described roller 10 is provided with belt 8，Tachymeter 9 is installed in roller 10 rotating shaft，Contrast chi 4 it is sequentially provided with from bottom to up directly over roller 10 top、Line source 5，Contrast chi 4 is band color、The ruler that horizontal direction is rectangular with vertical direction，Line source 5 is directional light，Roller 10 output is rectified the side of going forward and is provided with photographic head 3，Photographic head 3 according to the height of material 7 with belt 8 in 6 ° (to guarantee that the image obtained can include roller 10 top half、Material 7 above roller 10、Contrast chi 4 and feature light belt 6)，Tachymeter 9 connects the usb communication mouth of main frame 1 by holding wire，Photographic head 3 is connected with main frame 1 by image capture module 2，Line source 5 is connected with main frame 1 by digital output module 11，Line source 5 is radiated at the material 7 at roller 10 top and presents feature light belt 6 according to marginal surface pattern.Use contrast chi 4 as the calculating standard of image pixel Yu actual size, the no matter change such as the position distance height of photographic head 3 or angle deviating, all the time can determine that the corresponding relation of image pixel and actual size, contrast chi 4 is square, its cross-directional length is suitable with roller 10, vertical-direction length is slightly larger than material 7 maximum height, and contrast chi 4 color has the biggest contrast with ambient color.Wherein image capture module 2 and main frame 1 pass through ethernet communication；Line source 5 is colored directional light, material 7 is formed elongated feature light belt 6, it is derived from accurate material cross section contour, it is to avoid front and back image is overlapping and affect the acquisition in accurate material cross section, and the color of feature light belt 6 and other object colors have the biggest contrast；Photographic head 3 is periodicity image pickup mode, and main frame 1 obtains digital picture and the speed data of tachymeter 9 the most simultaneously.
Hardware configuration is:
Main frame 1 be configured that CPU is I54590, internal memory 4G, hard disk 800G, 100/1000M Ethernet, USB3.0,21 inch LCD display；The resolution of image capture module 2 is 1920*1080, it is provided that 100M Ethernet interface；The resolution of photographic head 3 is 1920 × 1080；Contrast chi 4 is white, and cross-directional length is 600mm, and vertical-direction length is 300mm；The a length of 600mm of line source 5, light is red and close to directional light；Tachymeter 9 uses usb communication mode, exports belt speed data.
Hardware installation method is:
Hookup wire light source 5 at about 300mm directly over the top of the roller 10 of travelling belt outfan；At the front lower place installation Comparison chi 4 of line source 5, align with the top of roller 10 in the vertical direction lower end of contrast chi 4；Installing photographic head 3 before contrast chi 4, photographic head 3 becomes 6 ° of angles, photographic head 3 to be connected with image capture module 2 by order wire with belt 8 plane, and image capture module 2 is connected with image belt conveyer scale main frame 1 by Ethernet；The axle of tachymeter 9 is connected on the axle of roller 10, and both are concentric, and tachymeter 9 is connected with image belt conveyer scale main frame 1 by usb communication.The installation site of photographic head 3 is just to make material 7, contrast chi 4, roller 9 top be included in along the line in image.
If Fig. 2 is to shown in 7, the detection method of this image belt conveyer scale detection device:
A () main frame 1 is opened and closed by digital output module 11 control line light source 5；
Image at acquisition travelling belt 8 delivery bowl of (b) photographic head 3 periodically (it is 0.1s that cycle T is calculated in design), by image capture module 2, digital picture is passed in main frame 1, digital image resolution is 1920 × 1080, and digital picture is stored in the internal memory of main frame 1；
C () detects the speed of travelling belt 8 with tachymeter 9, and collect in main frame 1 by holding wire, and for convenience of description, this example assumes that a certain moment travelling belt speed is 1.4m/s；
In d image that () step (b) collects, feature light belt 6 connection formed on material 7 both sides belt 8 by line source 5 obtains supplementing line 12, and with supplementary line 12 as lower boundary, line source 5 be radiated at feature light belt 6 that the material 7 at roller 10 top formed as coboundary, obtain material by Digital Image Segmentation and split Figure 13, and split the real area corresponding for Figure 13 area of section as actual material using material；Big with the pixel contrast of other parts image owing to the image that collects contrasting chi 4 image, obtain contrast chi by Digital Image Segmentation and split Figure 14；
E contrast chi that () obtains according to step (d) splits Figure 14, according to the physical length horizontally and vertically that contrast chi is actual, and contrast chi pixel horizontally and vertically, it is calculated the physical length that contrast chi unit picture element horizontally and vertically is corresponding, both are multiplied real area corresponding to unit of account pixel, the contrast chi obtained due to this digital picture is split in Figure 14, obtaining contrast chi 4 cross-directional length is 1920 pixels, vertical-direction length is 1080 pixels, physical length=600/1920=0.3125 (mm) that contrast chi horizontal direction unit picture element is corresponding；Physical length=300/1080=0.2778 (mm) that contrast chi vertical direction unit picture element is corresponding；Real area=0.3125 that unit picture element is corresponding × 0.2778=0.0868 (mm2)；
F () splits Figure 13 according to the material that step (d) obtains and tries to achieve the total pixel number of material cross-sectional image, total pixel number is multiplied by the real area that step (e) unit picture element is corresponding, try to achieve the actual cross-section area of material, for convenience of description, this example assumes the total pixel number 339520 of a certain moment material cross-sectional image, then real area=339520 in tested material cross section × 0.0868=29470 (mm2)=0.02947m2；
G () uses belt idle running calibration material sectional area side-play amount S0, namely the meansigma methods of material sectional area S sought by empty belt when running；The calculating that time is 60s, the 60s periodicity=60/0.1=600 (individual) needed for 3 weeks assuming that belt 8 dallies, the material sectional area aggregate-value that system obtains is 0.09m2, then S0=0.09/600=1.5 × 10-4。
H () is according to formula Q=KdV (S-S0) calculate the mass flow in each detection cycle, it is assumed that K=0.98 and d=3100kg/m3, V=1.0m/s, utilize the above results S=0.02947m2, S0==1.5 × 10-4m2, then mass flow Q=KdV (S-S0)=0.98 × 3100 × 1.0 × (0.02947-0.00015)=89.074 (kg/s).
I () mass flow accumulated value computational methods are: assume that belt carries with the flow of 89.074kg/s always, calculate the accumulation of material value of 1 hour.Calculate cycle T=0.1s, calculating periodicity N=3600/0.1=36000 (individual) of 1 hour, then the computational methods of 36000 mass flow accumulated value W calculated in cycle time are
J () uses matching type calibrated fluxes COEFFICIENT K in kindSchool, its method is: by a certain amount of W in kind1=1000kg puts into belt 8 transport and transports complete to material object, and the time of needs is 13s, needs to carry out 130 samplings calculating the cycles and calculates, for the ease of calculating, it is assumed that material area of section SiPerseverance is 0.02578m2Speed V of belt 8iPerseverance is 1.0m/s, utilizes data above, K=0.98, d=3100kg/m3, Si=0.02947m2, S0==1.5 × 10-4m2, the newest flow coefficient kSchoolComputing formula be:
K () passes through formula Q=KSchooldV(S-S0)=0.988 × 3100 × 1.0 × (0.02578-0.00015)=78.499 (kg/s).
Embodiment 2
The mass flow of the travelling belt of smeltery's fine iron breeze is detected.Fine iron breeze granularity is below 1mm.Belt width is 650mm, and belt speed scope is 1.3～1.5m/s, and the bulk density of fine iron breeze is 2365kg/m3, fine iron breeze color is black.
nullAs shown in Figure 1，This image belt conveyer scale detection device，Including main frame 1、Image capture module 2、Photographic head 3、Contrast chi 4、Line source 5、Feature light belt 6、Belt 8、Tachymeter 9、Roller 10 and digital quantity output module 11，Described roller 10 is provided with belt 8，Tachymeter 9 is installed in roller 10 rotating shaft，Contrast chi 4 it is sequentially provided with from bottom to up directly over roller 10 top、Line source 5，Contrast chi 4 is band color、The ruler that horizontal direction is rectangular with vertical direction，Line source 5 is directional light，Roller 10 output is rectified the side of going forward and is provided with photographic head 3，Photographic head 3 according to the height of material 7 with belt 8 in 15 ° (to guarantee that the image obtained can include roller 10 top half、Material 7 above roller 10、Contrast chi 4 and feature light belt 6)，Tachymeter 9 connects the usb communication mouth of main frame 1 by holding wire，Photographic head 3 is connected with main frame 1 by image capture module 2，Line source 5 is connected with main frame 1 by digital output module 11，Line source 5 is radiated at the material 7 at roller 10 top and presents feature light belt 6 according to marginal surface pattern.Use contrast chi 4 as the calculating standard of image pixel Yu actual size, the no matter change such as the position distance height of photographic head 3 or angle deviating, all the time can determine that the corresponding relation of image pixel and actual size, contrast chi 4 is square, its cross-directional length is suitable with roller 10, vertical-direction length is slightly larger than material 7 maximum height, and contrast chi 4 color has the biggest contrast with ambient color.Wherein image capture module 2 and main frame 1 pass through ethernet communication；Line source 5 is colored directional light, material 7 is formed elongated feature light belt 6, it is derived from accurate material cross section contour, it is to avoid front and back image is overlapping and affect the acquisition in accurate material cross section, and the color of feature light belt 6 and other object colors have the biggest contrast；Photographic head 3 is periodicity image pickup mode, and main frame 1 obtains digital picture and the speed data of tachymeter 9 the most simultaneously.
Hardware configuration is:
Main frame 1 be configured that CPU is I34170, internal memory 2G, hard disk 500G, 100/1000M Ethernet, USB3.0,23 inch LCD display；The resolution of image capture module 2 is 1280 × 1024, it is provided that 100M Ethernet interface；The resolution of photographic head 3 is 1280 × 1024；Contrast chi 4 is yellow, and cross-directional length is 700mm, and vertical-direction length is 350mm；The a length of 700mm of line source 5, light is blue and close to directional light；Tachymeter 9 uses usb communication mode, exports belt speed data.
Hardware installation method is:
Hookup wire light source 5 at about 300mm directly over the top of the roller 10 of travelling belt outfan；At the contrast chi 4 installed below of line source 5, align with the top of roller 10 in the vertical direction lower end of contrast chi 4；Installing photographic head 3 before contrast chi 4, photographic head 3 becomes 15 ° of angles, photographic head 3 to be connected with image capture module 2 by order wire with belt 8 plane, and image capture module 2 is connected with image belt conveyer scale main frame 1 by Ethernet；The axle of tachymeter 9 is connected on the axle of roller 10, and both are concentric, and tachymeter 9 is connected with image belt conveyer scale main frame 1 by usb communication.The installation site of photographic head 3 is just to make material 7, contrast chi 4, roller 9 top be included in along the line in image.
If Fig. 2 is to shown in 7, the detection method of this image belt conveyer scale detection device:
A () main frame (1) is opened and closed by digital output module 11 control line light source 5；
Image at acquisition travelling belt 8 delivery bowl of (b) photographic head 3 periodically (it is 0.05s that cycle T is calculated in design), by image capture module 2, digital picture is passed in main frame 1, digital image resolution is 1280 × 1024, and digital picture is stored in the internal memory of main frame 1；
C () detects the speed of travelling belt 8 with tachymeter 9, and collect in main frame 1 by holding wire, and for convenience of description, this example assumes that a certain moment travelling belt speed is 1.4m/s；
In d image that () step (b) collects, feature light belt 6 connection formed on material 7 both sides belt 8 by line source 5 obtains supplementing line 12, and with supplementary line 12 as lower boundary, line source 5 be radiated at feature light belt 6 that the material 7 at roller 10 top formed as coboundary, obtain material by Digital Image Segmentation and split Figure 13, and split the real area corresponding for Figure 13 area of section as actual material using material；Big with the pixel contrast of other parts image owing to the image that collects contrasting chi 4 image, obtain contrast chi by Digital Image Segmentation and split Figure 14；
E contrast chi that () obtains according to step (d) splits Figure 14, according to the physical length horizontally and vertically that contrast chi is actual, and contrast chi pixel horizontally and vertically, it is calculated the physical length that contrast chi unit picture element horizontally and vertically is corresponding, both are multiplied real area corresponding to unit of account pixel, the contrast chi obtained due to this digital picture is split in Figure 14, obtaining contrast chi 4 cross-directional length is 1280 pixels, vertical-direction length is 1024 pixels, physical length=700/1280=0.547 (mm) that contrast chi horizontal direction unit picture element is corresponding；Physical length=350/1024=0.342 (mm) that contrast chi vertical direction unit picture element is corresponding；Real area=0.547 that unit picture element is corresponding × 0.342=0.187 (mm2)；
F () splits Figure 13 according to the material that step (d) obtains and tries to achieve the total pixel number of material cross-sectional image, total pixel number is multiplied by the real area that step (e) unit picture element is corresponding, try to achieve the actual cross-section area of material, for convenience of description, this example assumes the total pixel number 313000 of a certain moment material cross-sectional image, then real area=31300 in tested material cross section × 0.187=5853 (mm2)=0.00585m2；
G () uses belt idle running calibration material sectional area side-play amount S0, namely during empty belt, seek the meansigma methods of material sectional area S；The calculating that time is 30s, the 30s periodicity=30/0.05=600 (individual) needed for 2 weeks assuming that belt 8 dallies, the material sectional area aggregate-value that system obtains is 0.2m2, then S0=0.2/600=3.3 × 10-4。
H () is according to formula Q=KdV (S-S0) calculate the mass flow in each detection cycle, it is assumed that K=1.0 and d=2365kg/m3, V=1.4m/s, utilize the above results S=0.00585m2, S0==3.3 × 10-4m2, then mass flow Q=KdV (S-S0)=1.0 × 2365 × 1.4 × (0.00585-0.00033)=18.277 (kg/s)
I () mass flow accumulated value computational methods are: assume that belt carries with the flow of 18.277kg/s always, calculate the accumulation of material value of 2 hours.Calculate cycle T=0.05s, calculating periodicity N=7200/0.05=144000 (individual) of 2 hours, then the computational methods of 144000 mass flow accumulated value W calculated in cycle time are
J () uses matching type calibrated fluxes COEFFICIENT K in kindSchool, its method is: by a certain amount of W in kind1=900kg puts into belt 8 transport and transports complete to material object, and the time of needs is 11s, needs to carry out 220 samplings calculating the cycles and calculates, for the ease of calculating, it is assumed that material area of section SiPerseverance is 0.024m2Speed V of belt 8iPerseverance is 1.4m/s, utilizes data above, K=1.0, d=2365kg/m3, Si=0.03m2, S0==3.3 × 10-4m2, the newest flow coefficient kSchoolComputing formula be:
K () passes through formula Q=KSchooldV(S-S0)=1.043 × 2365 × 1.4 × (0.00585-0.00033)=19.062 (kg/s).
Embodiment 3
Detecting the mass flow of the coal dust belt conveyor of certain batch plant, coal powder size is below 2mm.Belt width is 1000mm, and belt speed scope is 0.5～0.6m/s, and the bulk density of coal dust is 475kg/m3, coal dust color is black.
nullAs shown in Figure 1，This image belt conveyer scale detection device，Including main frame 1、Image capture module 2、Photographic head 3、Contrast chi 4、Line source 5、Feature light belt 6、Belt 8、Tachymeter 9、Roller 10 and digital quantity output module 11，Described roller 10 is provided with belt 8，Tachymeter 9 is installed in roller 10 rotating shaft，Contrast chi 4 it is sequentially provided with from bottom to up directly over roller 10 top、Line source 5，Contrast chi 4 is band color、The ruler that horizontal direction is rectangular with vertical direction，Line source 5 is directional light，Roller 10 output is rectified the side of going forward and is provided with photographic head 3，Photographic head 3 according to the height of material 7 with belt 8 in 10 ° (to guarantee that the image obtained can include roller 10 top half、Material 7 above roller 10、Contrast chi 4 and feature light belt 6)，Tachymeter 9 connects the usb communication mouth of main frame 1 by holding wire，Photographic head 3 is connected with main frame 1 by image capture module 2，Line source 5 is connected with main frame 1 by digital output module 11，Line source 5 is radiated at the material 7 at roller 10 top and presents feature light belt 6 according to marginal surface pattern.Use contrast chi 4 as the calculating standard of image pixel Yu actual size, the no matter change such as the position distance height of photographic head 3 or angle deviating, all the time can determine that the corresponding relation of image pixel and actual size, contrast chi 4 is square, its cross-directional length is suitable with roller 10, vertical-direction length is slightly larger than material 7 maximum height, and contrast chi 4 color has the biggest contrast with ambient color.Wherein image capture module 2 and main frame 1 pass through ethernet communication；Line source 5 is colored directional light, material 7 is formed elongated feature light belt 6, it is derived from accurate material cross section contour, it is to avoid front and back image is overlapping and affect the acquisition in accurate material cross section, and the color of feature light belt 6 and other object colors have the biggest contrast；Photographic head 3 is periodicity image pickup mode, and main frame 1 obtains digital picture and the speed data of tachymeter 9 the most simultaneously.
Hardware configuration is:
Main frame 1 be configured that model is L1041, internal memory 1G, solid state hard disc 32G, 100M Ethernet, USB2.0,10.4 inches of LCD displays；The resolution of image capture module 2 is 2048 × 1536, it is provided that 100M Ethernet interface；The resolution of photographic head 3 is 2048 × 1536；Contrast chi 4 is white, and cross-directional length is 1100mm, and vertical-direction length is 400mm；The a length of 1100mm of line source 5, light is blue and close to directional light；Tachymeter 9 uses usb communication mode, exports belt speed data.
Hardware installation method is:
Hookup wire light source 5 at about 300mm directly over the axis of the roller 10 of travelling belt outfan；At the contrast chi 4 installed below of line source 5, align with the top of roller 10 in the vertical direction lower end of contrast chi 4；Installing photographic head 3 before contrast chi 4, photographic head 3 becomes 10 ° of angles, photographic head 3 to be connected with image capture module 2 by order wire with belt 8 plane, and image capture module 2 is connected with image belt conveyer scale main frame 1 by Ethernet；The axle of tachymeter 9 is connected on the axle of roller 10, and both are concentric, and tachymeter 9 is connected with image belt conveyer scale main frame 1 by usb communication.The installation site of photographic head 3 is just to make material 7, contrast chi 4, roller 9 top be included in along the line in image.
If Fig. 2 is to shown in 7, the detection method of this image belt conveyer scale detection device:
A () main frame 1 is opened and closed by digital output module 11 control line light source 5；
Image at acquisition travelling belt 8 delivery bowl of (b) photographic head 3 periodically (it is 0.02s that cycle T is calculated in design), by image capture module 2, digital picture is passed in main frame 1, digital image resolution is 2048 × 1536, and digital picture is stored in the internal memory of main frame 1；
C () detects the speed of travelling belt 8 with tachymeter 9, and collect in main frame 1 by holding wire, and for convenience of description, this example assumes that a certain moment travelling belt speed is 0.5m/s；
In d image that () step (b) collects, feature light belt 6 connection formed on material 7 both sides belt 8 by line source 5 obtains supplementing line 12, and with supplementary line 12 as lower boundary, line source 5 be radiated at feature light belt 6 that the material 7 at roller 10 top formed as coboundary, obtain material by Digital Image Segmentation and split Figure 13, and split the real area corresponding for Figure 13 area of section as actual material using material；Big with the pixel contrast of other parts image owing to the image that collects contrasting chi 4 image, obtain contrast chi by Digital Image Segmentation and split Figure 14；
E contrast chi that () obtains according to step (d) splits Figure 14, according to the physical length horizontally and vertically that contrast chi is actual, and contrast chi pixel horizontally and vertically, it is calculated the physical length that contrast chi unit picture element horizontally and vertically is corresponding, both are multiplied real area corresponding to unit of account pixel, the contrast chi obtained due to this digital picture is split in Figure 14, obtaining contrast chi 4 cross-directional length is 2048 pixels, vertical-direction length is 1536 pixels, physical length=1100/2048=0.537 (mm) that contrast chi horizontal direction unit picture element is corresponding；Physical length=400/1536=0.260 (mm) that contrast chi vertical direction unit picture element is corresponding；Real area=0.537 that unit picture element is corresponding × 0.26=0.1396 (mm2)；
F () splits Figure 13 according to the material that step (d) obtains and tries to achieve the total pixel number of material cross-sectional image, total pixel number is multiplied by the real area that step (e) unit picture element is corresponding, try to achieve the actual cross-section area of material, for convenience of description, this example assumes the total pixel number 520000 of a certain moment material cross-sectional image, then real area=520000 in tested material cross section × 0.1396=72592 (mm2)=0.0726m2；
G () uses belt idle running calibration material sectional area side-play amount S0, namely during empty belt, seek the meansigma methods of material sectional area S；The calculating that time is 50s, the 50s periodicity=50/0.02=2500 (individual) needed for 2 weeks assuming that belt 8 dallies, the material sectional area aggregate-value that system obtains is 0.5m2, then S0=0.5/2500=2 × 10-4。
H () is according to formula Q=KdV (S-S0) calculate the mass flow in each detection cycle, it is assumed that K=1.1 and d=475kg/m3, V=0.5m/s, utilize the above results S=0.0726m2, S0==2 × 10-4m2, then mass flow Q=KdV (S-S0)=1.1 × 475 × 0.5 × (0.072-0.0002)=18.758 (kg/s)
Above in association with accompanying drawing, the detailed description of the invention of the present invention is explained in detail, but the present invention is not limited to above-mentioned embodiment, in the ken that those of ordinary skill in the art are possessed, it is also possible on the premise of without departing from present inventive concept, various changes can be made.
Claims (4)
- null1. an image belt conveyer scale detection device，It is characterized in that: include main frame (1)、Image capture module (2)、Photographic head (3)、Contrast chi (4)、Line source (5)、Feature light belt (6)、Belt (8)、Tachymeter (9)、Roller (10) and digital quantity output module (11)，Described roller (10) is provided with belt (8)，Tachymeter (9) is installed in roller (10) rotating shaft，Contrast chi (4) it is sequentially provided with from bottom to up directly over roller (10) top、Line source (5)，Contrast chi (4) is band color、The ruler that horizontal direction is rectangular with vertical direction，Line source (5) is directional light，Roller (10) output is rectified the side of going forward and is provided with photographic head (3)，Photographic head (3) and belt (8) face are 6 °～the angle of 15 °，Tachymeter (9) connects the usb communication mouth of main frame (1) by holding wire，Photographic head (3) is connected with main frame (1) by image capture module (2)，Line source (5) is connected with main frame (1) by digital output module (11)，Line source (5) is radiated at the material (7) at roller (10) top and presents feature light belt (6) according to marginal surface pattern.
- Image belt conveyer scale the most according to claim 1 detection device, it is characterised in that: described image capture module (2) and main frame (1) pass through ethernet communication.
- Image belt conveyer scale the most according to claim 1 detection device, it is characterised in that: described line source (5) is colored directional light.
- Image belt conveyer scale the most according to claim 1 detection device, it is characterised in that: described photographic head (3) is periodicity image pickup mode, and main frame (1) obtains digital picture and the speed data of tachymeter (9) the most simultaneously.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105509848A (en) * | 2015-12-23 | 2016-04-20 | 昆明理工大学 | Image belt weigher detection device and method thereof |
| CN107128661A (en) * | 2017-05-17 | 2017-09-05 | 安徽理工大学 | Contactless Belt Conveying weight calculation and departure warning device |
| CN107255498A (en) * | 2017-06-02 | 2017-10-17 | 西安理工大学 | Conveyer belt weight of material measuring system and measuring method based on binocular vision |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105509848A (en) * | 2015-12-23 | 2016-04-20 | 昆明理工大学 | Image belt weigher detection device and method thereof |
| CN105509848B (en) * | 2015-12-23 | 2018-12-14 | 昆明理工大学 | A kind of image weighing belt detection device and its method |
| CN107128661A (en) * | 2017-05-17 | 2017-09-05 | 安徽理工大学 | Contactless Belt Conveying weight calculation and departure warning device |
| CN107128661B (en) * | 2017-05-17 | 2020-01-14 | 安徽理工大学 | Non-contact belt conveying weighing and deviation warning device |
| CN107255498A (en) * | 2017-06-02 | 2017-10-17 | 西安理工大学 | Conveyer belt weight of material measuring system and measuring method based on binocular vision |
| CN107255498B (en) * | 2017-06-02 | 2020-06-26 | 西安理工大学 | Conveying belt material weight measuring system and method based on binocular vision |
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