CN107727207A - A kind of optics belt conveyer scale and its measuring method - Google Patents
A kind of optics belt conveyer scale and its measuring method Download PDFInfo
- Publication number
- CN107727207A CN107727207A CN201710873577.7A CN201710873577A CN107727207A CN 107727207 A CN107727207 A CN 107727207A CN 201710873577 A CN201710873577 A CN 201710873577A CN 107727207 A CN107727207 A CN 107727207A
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- Prior art keywords
- belt
- laser
- video camera
- coordinate system
- driving wheel
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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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention provides a kind of noncontacting measurement formula optics belt conveyer scale and its measuring method, and it is made up of scale frame, carrying roller, driving wheel, belt, laser, video camera, driven pulley, motor and computer.Driving wheel, carrying roller and driven pulley are sequentially arranged on scale frame, and be looped around outside is annular belt.Uniformly video camera is installed in one row's laser of installation, the outside top of driving wheel axis on scale frame cross-arm.By establishing measuring coordinate system and photo coordinate system, the laser facula that laser illumination is formed on material is through video camera shooting image, and after sending computer to carry out image procossing, coordinate of these hot spots in photo coordinate system and measuring coordinate system can be obtained, with reference to given data, computer can calculate the gross weight for leaving belt conveyer scale material.The beneficial effects of the present invention are：1. non-contact measurement, measurement result is not influenceed by belt tension change and belt vibration；2. the material after weighing leaves belt immediately, so as to accurately control charge weight；3. it is not required to make any change to conveyer.
Description
Technical field
The present invention relates to a kind of optics belt conveyer scale.
Background technology
Belt conveyer scale is a kind of weighing apparatus to being placed on the bulk material progress automatic weighing on belt and with belt continuous moving
Device, it is widely used in continuous metering and the dispensing control of the industries such as cement, coal, coking, steel, mine, generating, chemical industry, food
System.Mainly it is made up of scale frame, weighing sensor, tachogenerator and weighing instrument.It is arranged on when material passes through on belt conveyer scale
During weighing sensor, sensor detects the weight of material, then passes data on weighing instrument.Meanwhile the sensing that tests the speed
The travelling speed of belt conveyor is delivered on weighing instrument by device.Weighing instrument will be received from tachogenerator and weighing sensor
The data message collected carries out Integral Processing, calculates on belt conveyor by the instantaneous delivery and cumulative weight of material.So
And when the material skewness or belt vibration on belt, the elastic and tension force of belt is necessarily sent out near weighing sensor
Changing, weighing precision is caused to produce error.In addition, belt deviation, carrying roller (especially weighing carrier roller) do not turn or frictional force compared with
Greatly, scale body and fixed support contact, sensor loosens, material is jammed and scale body Zero change may all influence the measurement of belt conveyer scale
Precision.
Uclear scale is a kind of contactless loose unpacked material on-line continuous metering and supervising device, is to gamma-rays using material
The principle that beam absorbs, the weighing apparatus of new generation of on-line continuous metering is carried out to the loose unpacked material of conveyer transmission, its measuring principle is
Conveyer load is calculated to the attenuation ratio of gamma intensity according to material, mass flow and tired is drawn multiplied by with conveyor speed
Metering.But gamma-rays has extremely strong penetration power, after human body is irradiated by gamma-rays, gamma-rays can enter the interior of human body
Portion, and ionization occurs with internal cell, ion caused by ionization can corrode the organic molecule of complexity, such as protein, nucleic acid
And enzyme, they are all the Main Ingredients and Appearances for forming living cell tissue, once they are destroyed, may result in the normalization in human body
Process is interfered, and serious can make cell death.
The content of the invention
In view of the above-mentioned problems, the invention provides a kind of noncontacting measurement formula optics belt conveyer scale, it is by scale frame, carrying roller, drive
Driving wheel, belt, laser, video camera, driven pulley, motor and computer composition.Driving wheel, carrying roller and driven pulley are installed successively
On scale frame, in their axis is generally aligned in the same plane, be looped around outside is annular belt.On scale frame on driving wheel
The cross-arm of Fang Youyi bars and driving wheel diameter parallel, uniformly one row's laser of installation, the optical axis of laser are parallel to each other on cross-arm,
It is and vertical with belt plane.Installation video camera above the outside of driving wheel axis, its image plane and all laser optical axis place
Plane it is parallel, the diameter parallel of horizontal line and driving wheel.
By establishing measuring coordinate system and photo coordinate system, the laser facula that laser illumination is formed on material is through taking the photograph
Camera shooting image, and send computer carry out image procossing after, can obtain these hot spots photo coordinate system and measurement sit
Coordinate in mark system, with reference to the distance between plane where camera image plane and all laser optical axis, without material when institute
Have ordinate of the laser facula in measuring coordinate system, the focal length of video camera and length in pixels, adjacent two laser optical axis it
Between distance, the density of the speed of service of belt and material, computer can calculate the gross weight for leaving belt conveyer scale material.This
The beneficial effect of invention is：
1. non-contact measurement, measurement result is not influenceed by belt tension change and belt vibration；
2. the material after weighing leaves belt immediately, so as to accurately control charge weight；
3. it is not required to make any change to conveyer.
Brief description of the drawings
Fig. 1 is optics belt conveyer scale principle schematic
Label declaration：
1 scale frame, 2 carrying rollers, 3 driving wheels, 4 belts, 5 laser faculas, 6 lasers, 7 video cameras, 8 materials, 9 driven pulleys
Embodiment
As shown in figure 1, optics belt conveyer scale by scale frame (1), carrying roller (2), driving wheel (3), belt (4), laser (6), take the photograph
Camera (7), driven pulley (9), motor and computer composition.Driving wheel (3), carrying roller (2) and driven pulley (9) are sequentially arranged at scale
On frame (1), in their axis is generally aligned in the same plane, be looped around outside is annular belt (4).Positioned at drive on scale frame (1)
There is a cross-arm with driving wheel (3) diameter parallel above driving wheel (3), row's laser (6), laser are uniformly installed on cross-arm
(6) optical axis is parallel to each other, and vertical with belt plane.Installation video camera (7), its picture above the outside of driving wheel (3) axis
Plane is parallel with the plane where all lasers (6) optical axis, the diameter parallel of horizontal line and driving wheel (3).
Laser (6), which is radiated on material (8), forms laser facula (5), and video camera (7) shoots these laser faculas (5),
Its position can be determined by image procossing, need to establish measuring coordinate system for this.
Three-dimensional measurement coordinate system o-xyz is established by the origin of coordinates of video camera (7) image planes midpoint o, it is right that x-axis points to image planes
Side, y-axis are pointed to above image planes, and z-axis points to the direction of scale frame (1).Two-dimensional coordinate system o-xy is exactly photo coordinate system.With f, l
The focal length and length in pixels of video camera (7) are represented respectively, with (x, y, z0) represent the seat of laser facula (5) in measuring coordinate system
Mark, then by pinhole imaging system principle, coordinate of the laser facula (5) in video camera (7) photo coordinate system is (m, n), and
Wherein | m |, | n | the number of pixels on respectively horizontal, longitudinal direction, z0It is video camera (7) image plane and all laser
The distance between plane where device (6) optical axis.Thus
Because video camera (7) image plane is parallel with the plane where all lasers (6) optical axis, and video camera (7) is horizontal
The diameter parallel of line and driving wheel (3), therefore when on belt (4) without material (8), all laser faculas (5) are sat in image plane
Ordinate in mark system and measuring coordinate system is constant, is designated as n respectively0And y0=n0z0l/f.There is material on belt (4)
(8) when, with (mi, ni), i=1,2 ..., N, coordinate of all laser faculas (5) in photo coordinate system is represented, then these swash
Coordinate (x of the light hot spot (5) in measuring coordinate systemi, yi, z0), i=1,2 ..., N is represented by
The distance between adjacent two lasers (6) optical axis is represented with d, v represents the speed of service of belt (4), ρ expression things
Expect the density of (8), then material (8) weight for leaving belt (4) is
Therefore, computer is calculated using above-mentioned formula can by the view data of acquisition camera (7) and leaves skin
The gross weight of the material (8) of belt scale.
Claims (2)
- A kind of 1. optics belt conveyer scale, it is characterised in that：By scale frame (1), carrying roller (2), driving wheel (3), belt (4), laser (6), video camera (7), driven pulley (9), motor and computer composition, driving wheel (3), carrying roller (2) and driven pulley (9) are pacified successively On scale frame (1), in their axis is generally aligned in the same plane, be looped around outside is annular belt (4), on scale frame (1) There is a cross-arm with driving wheel (3) diameter parallel above driving wheel (3), row's laser (6) be uniformly installed on cross-arm, The optical axis of laser (6) is parallel to each other, and vertical with belt plane；Installation video camera above the outside of driving wheel (3) axis (7), its image plane is parallel with the plane where all lasers (6) optical axis, the diameter parallel of horizontal line and driving wheel (3).
- 2. the measuring method of optics belt conveyer scale according to claim 1, it is characterised in that：With video camera (7) image planes midpoint o Three-dimensional measurement coordinate system o-xyz is established for the origin of coordinates, x-axis points to image planes right, and y-axis is pointed to above image planes, and z-axis points to scale frame (1) direction；Two-dimensional coordinate system o-xy is as photo coordinate system；With f, l represents the focal length and pixel length of video camera (7) respectively Degree, d represent the distance between adjacent two lasers (6) optical axis, and v represents the speed of service of belt (4), and ρ represents material (8) Density, z0The distance between plane where expression video camera (7) image plane and all lasers (6) optical axis, n0Indicate no material (8) ordinate of all laser faculas (5) in photo coordinate system under state；When measuring material (8) weight, start motor And drive the material (8) on belt (4) to be run to the direction of video camera (7), with unlatching laser (6)；Video camera (7) shooting bag Include the image of all laser faculas (5) and handled by computer and calculated；With ni, i=1,2 ..., N, represent successively all Ordinate of the laser facula (5) in photo coordinate system, then material (8) weight for leaving belt (4) are
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710873577.7A CN107727207A (en) | 2017-09-19 | 2017-09-19 | A kind of optics belt conveyer scale and its measuring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710873577.7A CN107727207A (en) | 2017-09-19 | 2017-09-19 | A kind of optics belt conveyer scale and its measuring method |
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| Publication Number | Publication Date |
|---|---|
| CN107727207A true CN107727207A (en) | 2018-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710873577.7A Pending CN107727207A (en) | 2017-09-19 | 2017-09-19 | A kind of optics belt conveyer scale and its measuring method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109781196A (en) * | 2019-02-14 | 2019-05-21 | 苏州万闻信息工程有限公司 | A kind of contactless method for measuring mass flow on belt conveyor |
| CN110031069A (en) * | 2019-04-12 | 2019-07-19 | 东北大学 | A kind of movable weighing belt and application method based on laser ranging |
| CN116625476A (en) * | 2023-06-07 | 2023-08-22 | 江苏汇力智能科技有限公司 | Electronic belt scale fine-tuning calibration equipment that weighs |
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| EP2246673A1 (en) * | 2009-04-28 | 2010-11-03 | Sick Ag | Method for determining the volume of loads and device |
| CN103278225A (en) * | 2013-06-05 | 2013-09-04 | 中国矿业大学(北京) | Belt weighting device based on image technology detection |
| CN103308127A (en) * | 2013-06-05 | 2013-09-18 | 中国矿业大学(北京) | Weighing method on basis of image technology for belt |
| CN104515572A (en) * | 2015-01-13 | 2015-04-15 | 中国矿业大学(北京) | Belt weigher based on laser ranging |
| CN105509848A (en) * | 2015-12-23 | 2016-04-20 | 昆明理工大学 | Image belt weigher detection device and method thereof |
-
2017
- 2017-09-19 CN CN201710873577.7A patent/CN107727207A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2246673A1 (en) * | 2009-04-28 | 2010-11-03 | Sick Ag | Method for determining the volume of loads and device |
| CN103278225A (en) * | 2013-06-05 | 2013-09-04 | 中国矿业大学(北京) | Belt weighting device based on image technology detection |
| CN103308127A (en) * | 2013-06-05 | 2013-09-18 | 中国矿业大学(北京) | Weighing method on basis of image technology for belt |
| CN104515572A (en) * | 2015-01-13 | 2015-04-15 | 中国矿业大学(北京) | Belt weigher based on laser ranging |
| CN105509848A (en) * | 2015-12-23 | 2016-04-20 | 昆明理工大学 | Image belt weigher detection device and method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109781196A (en) * | 2019-02-14 | 2019-05-21 | 苏州万闻信息工程有限公司 | A kind of contactless method for measuring mass flow on belt conveyor |
| CN110031069A (en) * | 2019-04-12 | 2019-07-19 | 东北大学 | A kind of movable weighing belt and application method based on laser ranging |
| CN116625476A (en) * | 2023-06-07 | 2023-08-22 | 江苏汇力智能科技有限公司 | Electronic belt scale fine-tuning calibration equipment that weighs |
| CN116625476B (en) * | 2023-06-07 | 2023-10-24 | 江苏汇力智能科技有限公司 | Electronic belt scale fine-tuning calibration equipment that weighs |
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Application publication date: 20180223 |
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