CN105806247A - Wood board warping online detection device and detection method - Google Patents
Wood board warping online detection device and detection method Download PDFInfo
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- CN105806247A CN105806247A CN201610346390.7A CN201610346390A CN105806247A CN 105806247 A CN105806247 A CN 105806247A CN 201610346390 A CN201610346390 A CN 201610346390A CN 105806247 A CN105806247 A CN 105806247A
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- wooden boards
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
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- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a wood board warping online detection device which comprises a worktable, a linear laser emitter and an industrial camera.Black paperboards are arranged on the periphery of the worktable, and the linear laser emitter and the industrial camera are arranged on the upper portion of the worktable.A light source emitted by the linear laser emitter to the surface of a to-be-detected wood board on the worktable is reflected and then received by the industrial camera, and the industrial camera is connected with a computer at the same time.The invention discloses an online detection of the device.Compared with a manual detection method, the detection device and method have the advantages that laser online detection is high in efficiency, high in precision and the like; measurement is conducted through the triangulation ranging, measurement precision is improved, and industrial online detection is achieved.
Description
Technical field
The present invention relates to a kind of detecting device and detection method, especially relate to on-line measuring device and the detection method of a kind of wooden boards warpage, belong to timber processing and manufacturing field.
Background technology
The key component of timber is cellulose, hemicellulose and lignin, the steam of surrounding, moisture is had sufficient affinity, creates the moisture pick-up properties that timber is natural；The organism that timber is made up of cell, includes various capillary tubies, has plasticity.To sum up reason, wooden boards or woodwork can produce drying shrinkage and bulking phenomenon along with the change of ambient relative humidity.Owing to timber is a kind of heterogeneous anisotropic material, drying shrinkage and bulking also have anisotropic, are placed in the wooden boards in natural environment and can produce warpage, and the wooden boards angularity in different humiture environment is different.
Fig. 1-Fig. 2 is angularity measurement figure.As depicted in figs. 1 and 2: according to the method for inspection of angularity in standard GB/T/T15036.2-2009 solid wooden floor board: floor surface is upwards placed on level experiment table top, straight edge ruler or Steel Ruler is vertically measured maximum action hmax against Liang Chang limit, floor clearance gauge and is accurate to 001mm.Maximum action hmaxThe ratio surveying width ω with floor is width angularityfωIt is expressed as a percentage, is accurate to 0.01%.
Traditional detection is often by manually completing, and the maximum chord length of plank warpage determined by tester's clearance gauge or other measurer, according to measurement result, manual calculations wooden boards angularity.Workload is big, and efficiency is low, is affected by subjective measurement, it is impossible to carry out online high efficiency detection, it is difficult to puts into industry and quantifies detection.
Summary of the invention
In order to overcome prior art problem, it is an object of the invention to provide the on-line measuring device of the wooden boards warpage that a kind of measuring speed is fast, precision is high, simple to operate and detection method.
For solving above-mentioned technical problem, the technical solution used in the present invention is:
A kind of on-line measuring device of wooden boards warpage, it is characterized in that, including workbench, line laser transmitter and industrial camera, the surrounding of described workbench is provided with black cardboard, line laser transmitter and industrial camera are arranged at the top of workbench, and the light source on the described line laser transmitter wooden boards surface that to be transmitted on workbench to be detected is received by industrial camera after wooden boards reflects, and industrial camera connects with a computer simultaneously.
The online test method of a kind of wooden boards warpage, it is characterised in that comprise the following steps:
S1: line laser transmitter launches line laser to wooden boards to be detected on workbench, line laser by the lens of industrial camera, is then received imaging by the optical sensor being positioned at lens rear portion after real wooden boards surface reflection to be detected；
S2: the photosignal received is converted into digital signal by described optical sensor；
S3: the data collecting card in computer collects the digital signal of industrial camera, and after the process software processes of computer, obtain the warp image profile of wooden boards to be detected, and pixel unit is converted into long measure, then utilize the maximum action h that laser direct projection trigonometry obtainsmaxWith the length ω of line laser on tested wooden boards, calculating obtains angularity fω。
Further, in S3 step, described laser direct projection trigonometry is: a branch of line laser incides the surface of wooden boards to be detected, incident angle is 90 degree, there is a displacement AB on the surface of wooden boards to be detected along its normal direction, the side displacement of reflection light is A ' B ', and the surface displacement recording wooden boards according to the relation of AB and A ' B ' is poor.
And in S3 step, also include utilizing standard gauge block to carry out the step demarcated, and described scaling method is: by thickness every 0.5mm, from 2mm to 25mm, standard gauge block is placed on line laser transmitter and demarcates, the gauge block of differing heights, short transverse sampled pixel values is different, and corresponding numerical value carries out linear regression, obtains returning linear functionDescribedFor measuring pixel value,For actual height value, coefficient R=0.999, width ratio 0.139mm/ pixel.
The invention have the benefit that detecting device of the present invention with method compared with manual detection method, laser on-line checking has efficiency height, precision advantages of higher；Adopting the measurement of range of triangle method, certainty of measurement improves simultaneously, it is achieved that industry on-line checking.
Accompanying drawing explanation
Fig. 1-Fig. 2 is angularity measurement figure；
Fig. 3 is the schematic diagram that industrial camera receives line laser；
Fig. 4 is laser direct projection trigonometry schematic diagram；
Fig. 5 is short transverse regression straight line；
Fig. 6-Fig. 9 is the contour images of warpage wooden boards 1-4.
In figure, Main Reference Numerals implication is:
1, line laser transmitter 2, industrial camera 3, wooden boards 4 to be detected, wooden boards surface curvature line laser.
Detailed description of the invention
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
Embodiment 1:
Fig. 3 is laser triangulation principle schematic.
As shown in Figure 3: the on-line measuring device of wooden boards warpage, including workbench, line laser transmitter 1 and industrial camera 2, the surrounding of described workbench is provided with black cardboard, carry out process of being in the light, make the line laser that the light that camera receives only is launched, line laser transmitter 1 and industrial camera 2 are arranged at the top of workbench, and the light source on described line laser transmitter 1 wooden boards 3 surface that to be transmitted on workbench to be detected is received by industrial camera 2 after wooden boards reflects, and industrial camera 2 connects with a computer simultaneously.
The online test method of wooden boards warpage is:
S1: line laser transmitter 1 launches line laser to wooden boards 3 to be detected on workbench, form the picture of a line laser, this picture can produce respective change with detection board surface shape, line laser passes through the lens 21 of industrial camera 2 after real wooden boards 3 surface reflection to be detected, then imaging is received by the optical sensor 22 being positioned at lens 21 rear portion, owing to light is linearly propagated, by the lens 21 of industrial camera 2, the optical sensor 22 after lens 21 projects the real image of handstand；
S2: the photosignal received is converted into digital signal by described optical sensor 22；
S3: the data collecting card in computer collects the digital signal of industrial camera 2, and after the process software processes of computer, obtain the warp image profile of wooden boards 3 to be detected, and pixel unit is converted into long measure, in the image outline of display, line laser is the highest with minimum point difference in height and maximum action hmax, according to maximum action hmaxWith the length ω of line laser on tested wooden boards, calculating obtains angularity fω。
Above-mentioned laser direct projection trigonometry is: a branch of line laser incides the surface of wooden boards to be detected, incident angle is 90 degree, there is a displacement AB on the surface of wooden boards 3 to be detected along its normal direction, the side displacement of reflection light is A ' B ', and the surface displacement recording wooden boards according to the relation of AB and A ' B ' is poor.
Fig. 4 is laser direct projection trigonometry schematic diagram.
As shown in Figure 4: set AB=x, AD=x ', AO=L, BO=L ', A ' B '=y, AD ⊥ BO
Two kinds of computational methods of △ ABO area have AD BO=AB AOsin (180 ° of-θ)=AB AOsin θ and x ' L '=xLsin θ
In △ ABO, the cosine law has BO2=AB2+AO2-2AB AOcos (180 ° of-θ) i.e. L '2=x2+L2+2xLcosθ
Arrange
When optical system lateral magnification is β (ratio of image distance object distance), it is y=β x ' that the optical sensor 22 of industry phase 2 receives image point displacement amount
Namely
If tested displacement x is much smaller than L, there is y ≈ x β sin θ, the fitting a straight line of height value and short transverse sampled pixel values should cross initial point, but owing to x can not ignore for L, actual fitting a straight line is likely to only initial point, owing in formula, β and sin θ, for can survey known quantity, can pass through image detection length direct derivation physical length, calculate warp value.
Said method advantage is that physical dimension is little, and operating distance is big, and installation and debugging are convenient, it is possible to resolve a detection difficult problem for flexible material and the change of coarse surface of the work shaped position.
For ensureing that actually detected height is accurately relevant to height pixel value, before measurement, by thickness every 0.5mm, from 2mm to 25mm, standard gauge block is placed on line laser transmitter and demarcates for 1, the standard gauge block of differing heights, short transverse sampled pixel values is different, and corresponding numerical value is as shown in table 1.His-and-hers watches 1 data carry out linear regression, obtain returning linear function as it is shown in figure 5, correlation functionCoefficient R=0.999, dependency highly significant,For measuring pixel value,For actual height value, width ratio 0.139mm/ pixel.Obtain, as detected according to above-mentioned principle after co-relation, choosing warpage degree plank, putting on the table, allow width pass through line laser transmitter 1；The reflection light on tested wooden boards surface is received by the optical sensor 22 in industrial camera 2.
Table 1 short transverse sampled point calibration value
Fig. 6-Fig. 9 is the contour images of warpage wooden boards 1-4.
As shown in Figure 5-Figure 8: the relation according to image pixel after calibration with length, list data is as shown in table 2:
Table 2:
In table 2, data result represents that the described apparatus and method of this invention can realize the on-line checking of wooden boards angularity.Wooden boards length direction is then passed through by length direction angularity, and additive method is constant.Compared with manual detection method, laser on-line checking has efficiency height, precision advantages of higher；Adopting the measurement of range of triangle method, certainty of measurement improves simultaneously, it is achieved that industry on-line checking.
Present invention above-described embodiment is illustrated and should be appreciated that above-described embodiment does not limit the present invention in any form, and all employings are equal to replacement or the technical scheme that obtains of equivalent transformation mode, all fall within protection scope of the present invention.
Claims (4)
1. the on-line measuring device of a wooden boards warpage, it is characterized in that, including workbench, line laser transmitter and industrial camera, the surrounding of described workbench is provided with black cardboard, line laser transmitter and industrial camera are arranged at the top of workbench, and the light source on the described line laser transmitter wooden boards surface that to be transmitted on workbench to be detected is received by industrial camera after wooden boards reflects, and industrial camera connects with a computer simultaneously.
2. the online test method of a wooden boards warpage, it is characterised in that comprise the following steps:
S1: line laser transmitter launches line laser to wooden boards to be detected on workbench, line laser by the lens of industrial camera, is then received imaging by the optical sensor being positioned at lens rear portion after real wooden boards surface reflection to be detected；
S2: the photosignal received is converted into digital signal by described optical sensor；
S3: the data collecting card in computer collects the digital signal of industrial camera, and after the process software processes of computer, obtain the warp image profile of wooden boards to be detected, and pixel unit is converted into long measure, then utilize the maximum action h that laser direct projection trigonometry obtainsmaxWith the length ω of line laser on tested wooden boards, calculating obtains angularity fω。
3. the online test method of a kind of wooden boards warpage according to claim 2, it is characterized in that, in S3 step, described laser direct projection trigonometry is: a branch of line laser incides the surface of wooden boards to be detected, incident angle is 90 degree, there is a displacement AB on the surface of wooden boards to be detected along its normal direction, and the side displacement of reflection light is A ' B ', and the surface displacement recording wooden boards according to the relation of AB and A ' B ' is poor.
4. the online test method of a kind of wooden boards warpage according to claim 2, it is characterized in that, in S3 step, also including utilizing standard gauge block to carry out the step demarcated, and described scaling method is: by thickness every 0.5mm, from 2mm to 25mm, standard gauge block is placed on line laser transmitter and demarcates, the gauge block of differing heights, short transverse sampled pixel values is different, and corresponding numerical value carries out linear regression, obtains returning linear functionDescribedFor measuring pixel value,For actual height value, coefficient R=0.999, width ratio 0.139mm/ pixel.
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106247968A (en) * | 2016-08-31 | 2016-12-21 | 中冶赛迪工程技术股份有限公司 | The working roll amount of deflection real-time detecting system of a kind of strip straightener and method |
| CN106767452A (en) * | 2017-01-03 | 2017-05-31 | 徐兆军 | A kind of wood-based product's width detecting and its detection method |
| CN106871807A (en) * | 2017-01-07 | 2017-06-20 | 西安工业大学 | A kind of flat board steel billet amount of deflection detection method and device |
| CN106931895A (en) * | 2017-03-24 | 2017-07-07 | 三门三友科技股份有限公司 | A kind of minus plate device for detecting deformation and method |
| CN107063057A (en) * | 2017-03-24 | 2017-08-18 | 苏州光图智能科技有限公司 | A kind of tyre detection device with calibrating block |
| CN107388973A (en) * | 2017-07-06 | 2017-11-24 | 南京林业大学 | A kind of identification device of oblique fire formula wooden boards flash and recognition methods |
| CN107388962A (en) * | 2017-07-06 | 2017-11-24 | 南京林业大学 | A kind of on-line measuring device and detection method of wooden boards warpage |
| CN107883879A (en) * | 2016-09-29 | 2018-04-06 | 联合汽车电子有限公司 | Gluing quality 3D vision detection systems and its detection method |
| CN108177201A (en) * | 2018-03-14 | 2018-06-19 | 山东海超机械有限公司 | A kind of full-automatic wood plank processing device and processing method |
| CN108317966A (en) * | 2018-03-19 | 2018-07-24 | 河南科技大学 | A kind of anode guide rod steel claw deformation detection method and device |
| CN108827178A (en) * | 2018-07-19 | 2018-11-16 | 首钢集团有限公司 | A kind of strip warpage detection method and system |
| CN110196022A (en) * | 2019-06-20 | 2019-09-03 | 英特尔半导体(大连)有限公司 | Device and method for measuring angularity |
| CN110631508A (en) * | 2019-09-25 | 2019-12-31 | 武汉虹之彩包装印刷有限公司 | High-precision positioning paper curling degree detection device |
| CN112525081A (en) * | 2020-11-16 | 2021-03-19 | 广东九联科技股份有限公司 | Measuring method based on laser displacement |
| CN112797925A (en) * | 2021-01-22 | 2021-05-14 | 新智德精密零件(深圳)有限公司 | Soft rubber detection method, device, equipment and computer readable storage medium |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106247968A (en) * | 2016-08-31 | 2016-12-21 | 中冶赛迪工程技术股份有限公司 | The working roll amount of deflection real-time detecting system of a kind of strip straightener and method |
| CN107883879A (en) * | 2016-09-29 | 2018-04-06 | 联合汽车电子有限公司 | Gluing quality 3D vision detection systems and its detection method |
| CN106767452A (en) * | 2017-01-03 | 2017-05-31 | 徐兆军 | A kind of wood-based product's width detecting and its detection method |
| CN106871807A (en) * | 2017-01-07 | 2017-06-20 | 西安工业大学 | A kind of flat board steel billet amount of deflection detection method and device |
| CN106931895A (en) * | 2017-03-24 | 2017-07-07 | 三门三友科技股份有限公司 | A kind of minus plate device for detecting deformation and method |
| CN107063057A (en) * | 2017-03-24 | 2017-08-18 | 苏州光图智能科技有限公司 | A kind of tyre detection device with calibrating block |
| CN107388973A (en) * | 2017-07-06 | 2017-11-24 | 南京林业大学 | A kind of identification device of oblique fire formula wooden boards flash and recognition methods |
| CN107388962A (en) * | 2017-07-06 | 2017-11-24 | 南京林业大学 | A kind of on-line measuring device and detection method of wooden boards warpage |
| CN108177201A (en) * | 2018-03-14 | 2018-06-19 | 山东海超机械有限公司 | A kind of full-automatic wood plank processing device and processing method |
| CN108317966A (en) * | 2018-03-19 | 2018-07-24 | 河南科技大学 | A kind of anode guide rod steel claw deformation detection method and device |
| CN108317966B (en) * | 2018-03-19 | 2020-05-22 | 河南科技大学 | Anode guide rod steel claw deformation detection method and device |
| CN108827178A (en) * | 2018-07-19 | 2018-11-16 | 首钢集团有限公司 | A kind of strip warpage detection method and system |
| CN110196022A (en) * | 2019-06-20 | 2019-09-03 | 英特尔半导体(大连)有限公司 | Device and method for measuring angularity |
| CN110196022B (en) * | 2019-06-20 | 2020-10-27 | 英特尔半导体(大连)有限公司 | Device and method for measuring warpage |
| CN110631508A (en) * | 2019-09-25 | 2019-12-31 | 武汉虹之彩包装印刷有限公司 | High-precision positioning paper curling degree detection device |
| CN112525081A (en) * | 2020-11-16 | 2021-03-19 | 广东九联科技股份有限公司 | Measuring method based on laser displacement |
| CN112797925A (en) * | 2021-01-22 | 2021-05-14 | 新智德精密零件(深圳)有限公司 | Soft rubber detection method, device, equipment and computer readable storage medium |
| CN112880742A (en) * | 2021-01-24 | 2021-06-01 | 宝钢工程技术集团有限公司 | Multifunctional slab monitor and using method thereof |
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Application publication date: 20160727 |