CN1134571C - Measuring and control system of pavement smoothness (straightness) for paving machine - Google Patents
Measuring and control system of pavement smoothness (straightness) for paving machine Download PDFInfo
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- CN1134571C CN1134571C CNB99124205XA CN99124205A CN1134571C CN 1134571 C CN1134571 C CN 1134571C CN B99124205X A CNB99124205X A CN B99124205XA CN 99124205 A CN99124205 A CN 99124205A CN 1134571 C CN1134571 C CN 1134571C
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Abstract
The present invention relates to a measuring and controlling system for the smoothness and the straightness of a road surface paved by a paving machine, which comprises a measuring head, an image processing circuit, a transverse scanning device and a computer, wherein the measuring head comprises a light source and a CCD video camera, the light axis of the light source irradiates the ground in inclination and in an angle formed with the ground to form a light spot on the ground, and the CCD video camera is used for shooting the light spot; the image processing circuit is used for converting a simulating image signal obtained from the CCD video camera into a digital image signal to be stored; the transverse scanning device is connected with the measuring head to enable the measuring head and an external flatting board to carry out corresponding and transverse scanning movement; the computer obtains a computing result from the image processing circuit to calculate an average value which is used as a height actual-measured value, and a control signal is sent out to the height controlling unit of the flatting board.
Description
The present invention relates to a kind of measuring and control system of pavement smoothness (straightness) for paving machine.
In the speedway work progress, be to guarantee the glacing flatness on construction road surface, must adopt various means guarantee that construction machinery is the uniformity that paver is thrown in pitch thickness, and time flat to pitch of time flat board on the paver.General way is when construction, and the workman places the collimation wire rope according to the drawing requirement in the both sides, road, place while constructing, the sensor of special detection wire rope height is arranged on the construction machinery, with the height of sensor sensing wire rope, and send paver with height value, with control time plate height.This with wire rope (or similar reference installation) time machine both sides, shop that are laid in, this benchmark of general requirements has enough length to subdue the unevenness on original basic unit road surface, and measurement, control by time flat board height overhead guarantee the road surface glacing flatness of constructing, it uses not only that inconvenience, equipment are huge, low precision and efficient are low, and is subjected to environmental disturbances easily and produces error.
The object of the present invention is to provide a kind of measuring and control system of pavement smoothness (straightness) for paving machine that can greatly improve efficiency of construction and certainty of measurement.
In order to realize above-mentioned goal of the invention, the present invention, it is measuring and control system of pavement smoothness (straightness) for paving machine, this paver comprises the paver body, be connected time flat board on the paver body and be placed in time flat board on time plate height control module, it is characterized in that, this measuring and control system of pavement smoothness (straightness) for paving machine comprises: gauge head, it comprises light source and the ccd video camera that is oppositely arranged with this light source, the optical axis coplane of the optical axis of light source and ccd video camera wherein, light source with its optical axis and ground oblique fire at angle on the ground, form hot spot on the ground, and this hot spot is in the field range of described ccd video camera, by the hot spot of ccd video camera picked-up light source projects on ground; Image processing circuit links to each other with ccd video camera, and the analog picture signal that ccd video camera is obtained converts data image signal to and stores, and digital picture is carried out binary conversion treatment, computed image outline position average, storage result of calculation; Line time-base unit, fixing outer being connected on time flat board, and be connected with described gauge head, make this gauge head and this time flat board can do to move relative to transversal scanning; Computer, link to each other with image processing circuit, obtain single frames spot center position mean, scanning times and other result of calculation from image processing circuit, overall average by single sweep operation or scanning for several times and spot center side-play amount are calculated and are asked for the height measured value, send control signal to paver time plate height control module according to measured value.
Above-mentioned measuring and control system of pavement smoothness (straightness) for paving machine, wherein, hot spot can be rounded, or rectangle, or linear.
Owing to adopted above-mentioned technical solution, even light source is radiated at ground and produces the geometry in particular hot spot, utilize the ccd video camera pickup image, when having relative altitude to change on light source, ccd video camera and ground, the position of hot spot in camera field of view produces skew thereupon, machine is handled the image shift height change to be measured that converts as calculated, thereby determines the height measured value.In order to remove influences such as ground microcosmic injustice, little waviness, mechanical shock, system adopts scanning survey, repeatedly value asks average method to realize measuring accurately.Native system is applied on the paver, after the roadbed moulding, can improve efficiency of construction and certainty of measurement greatly.
Fig. 1 is the schematic diagram of measuring and control system of pavement smoothness (straightness) for paving machine of the present invention;
Fig. 2 is measuring principle of measurement system figure of the present invention;
Fig. 3 is the workflow block diagram of system of the present invention.
Fig. 1 is a measuring and control system of pavement smoothness (straightness) for paving machine of the present invention.Paver comprises the paver body, is connected time flat board on the paver body and is placed in time flat board on time plate height control module.
This measuring and control system of pavement smoothness (straightness) for paving machine comprises:
Gauge head, it comprises light source and the ccd video camera that is oppositely arranged with this light source, keep no relative motion between ccd video camera and the light source, the optical axis coplane of the optical axis of light source and ccd video camera wherein, light source is the light belt that center line forms the suitable angle of divergence with its optical axis, and with ground oblique fire at angle on the ground, form hot spot on the ground, can be circular, rectangle or linear, and this hot spot is in the field range of described ccd video camera, the optical axis of ccd video camera is perpendicular to the ground, by the hot spot of ccd video camera picked-up light source projects on ground;
Image processing circuit links to each other with ccd video camera, and the analog picture signal that ccd video camera is obtained converts data image signal to and stores, and digital picture is carried out binary conversion treatment, computed image outline position average, storage result of calculation;
Line time-base unit, fixing outer being connected on time flat board, and be connected with described gauge head, make this gauge head and this time flat board can do to move relative to transversal scanning, it can adopt common apparatus, as gauge head is fixed on the slide block, slide block is on guide rail and can pass through a pair of feed screw nut or belt, under the drive of motor, moves along guide rail, make gauge head along the guide rail scanning survey, to obtain the distance to the ground average in certain area;
Computer, link to each other with image processing circuit, obtain single frames spot center position mean, scanning times and other result of calculation from image processing circuit, overall average by single sweep operation or scanning for several times and spot center side-play amount are calculated and are asked for the height measured value, send control signal to paver time plate height control module according to measured value, paver is adjusted the thickness that is paved according to the result who the measures time flat board of raising or lower, and finally spreads out qualified road surface.
In addition, should respectively adorn the above-mentioned measuring and control system of pavement smoothness (straightness) for paving machine of a cover in paver time dull and stereotyped both sides.To adapt to the turning road surface, this point is consistent with existing paver height measuring device.
When above-mentioned light source employing 20mW semiconductor laser, ccd video camera uses quick logical 1881 video cameras in Taiwan, adds image pick-up card, the 16mm standard lens, and 45 ° at α angle, the single sweep operation picture number is 8 times, H gets 300mm.The result who records shows that according to above-mentioned configuration, certainty of measurement is better than 0.1mm.
Fig. 2 is measuring principle of measurement system figure of the present invention, is example with the light source that produces straight line, and light source becomes a light belt from the light that D2 sends through shaping, with becomes with ground (90 °-α) inclination angle is radiated at formation straight line section on the P0 of ground.The optical axis of ccd video camera is perpendicular to the ground, and with the optical axis of light source in a plane, its pick-up lens angle of half field-of view is β.Existing assumed initial state is: two optical axises meet at O point (light source on ground, video camera and ground distance reduce, when becoming big, light source optical axis hands over ground in O1 respectively, the O2 point), ccd video camera and light source distance D 1D2 between the two are fixed as X, video camera, laser instrument is H to the vertical distance of ground P0, if the two distance changes, be that H has a variation delta h (arriving P1 or P2 corresponding to D1D2), then correspondingly, not only light length can change in the image, and light relative position of (thereby in resulting image) in camera field of view also has changes delta x, and:
H＝X×ctgα
Δx＝Δh×tgα
So, if video camera, laser instrument remain the system that a nothing relatively moves, and the ccd video camera camera lens optical axis is perpendicular to the ground, light source irradiates a line segment with fixed angle on ground, so, according to the parameter alpha that designs in advance and demarcate, X,, just can calculate height H and the height change h of the system of video camera, laser constitution to ground by calculating the relative displacement Δ x of rectilinear picture in whole visual field that video camera obtained.Certainly, the lens design of video camera will be decided according to the span of H, rationally selects lens parameters for use, makes that image image when object distance is H is the most clear; Simultaneously, the selection of the angle of half field-of view β of video camera will be decided according to measurement category, make ground image in measurement all the time in camera field of view.
The selection of α not only is related to problems such as gauge head structure, image definition, also directly influence the resolution ratio of measuring system simultaneously: as, under the situation that camera parameters is fixed, α gets 45 °, and then the pass of H and X is 1: 1, and when α is taken as 60 °, this ratio is about 1: 1.732, be that certainty of measurement can obtain to improve, become big but cost is X, it is big that the gauge head structure becomes.
Above-mentioned is to be example with the light source that produces straight line, only is for saying something, and in actual the use, it can be any regular geometric shapes that the light that light source produces projects on the ground, as long as calculate this several picture off-centring, does not have difference in essence.
In the actual measurement, because the road surface that forms in each layer construction all can not be the ideal plane, have little grit, pit etc., so the image of video camera picked-up and the data of importing computer thus into can not be the straight line, circle of standard etc., machine is handled image as calculated, with respective shapes such as the gained data fitting are in line, justify, calculate relative displacement again.Each parameter of real system will and be measured desired precision and determine according to the characteristic of the object of using, measured surface.Generally speaking, under the certain prerequisite of camera pixel number, when measurand rough surface or waviness are big, require the area of one-shot measurement bigger, at this moment the precision of Ce Lianging is just low; Otherwise measurand surface smoothing or waviness are less than hour area of requirement measurement, and at this moment the resolution of Ce Lianging is just high.
Design of the present invention is decided to be the road surface of having completed with the measuring object of gauge head (optical measuring system), promptly the hypothesis paver is spread out a bit of more satisfactory road surface earlier, in follow-up laying, detection system will be benchmark with the leading portion, with time flat board, hydraulic jack, wait upon clothes motor, control circuit and form backfeed loop, regulate time plate height in real time, make it to keep height value stable, just can keep the glacing flatness of institute's road surface pavement.Above-mentioned principle is equivalent to: road surface length is divided into M segment, and (M＞n+1) when spreading the n+1 segment, is a benchmark control time flat board with n segment height.
Another key element of measuring is scanning.Because there is certain randomness on the measurand surface, what need measure is the average height that object surface arrives paver time flat board, because the existence that vibrations etc. are disturbed, the result of measurement and data fitting often is not the ideal value that coincidence measurement requires, the certain areal extent that needs the scanning measured surface, result to gained asks on average, the result that could will obtain near us.
By shown in Figure 3, the workflow block diagram of system of the present invention.
Claims (2)
1. measuring and control system of pavement smoothness (straightness) for paving machine, this paver comprises the paver body, is connected time flat board on the paver body and is placed in time flat board on time plate height control module, it is characterized in that this measuring and control system of pavement smoothness (straightness) for paving machine comprises:
Gauge head, it comprises light source and the ccd video camera that is oppositely arranged with this light source, the optical axis coplane of the optical axis of light source and ccd video camera wherein, light source with its optical axis and ground oblique fire at angle on the ground, form hot spot on the ground, and this hot spot is in the field range of described ccd video camera, by the hot spot of ccd video camera picked-up light source projects on ground;
Image processing circuit links to each other with ccd video camera, and the analog picture signal that ccd video camera is obtained converts data image signal to and stores, and digital picture is carried out binary conversion treatment, computed image outline position average, storage result of calculation;
Line time-base unit, fixing outer being connected on time flat board, and be connected with described gauge head, make this gauge head and this time flat board can do to move relative to transversal scanning;
Computer, link to each other with image processing circuit, obtain single frames spot center position mean, scanning times from image processing circuit, overall average by single sweep operation or scanning for several times and spot center side-play amount are calculated and are asked for the height measured value, send control signal to paver time plate height control module according to measured value.
2. measuring and control system of pavement smoothness (straightness) for paving machine according to claim 1 is characterized in that: described hot spot can be rounded, or rectangle, or linear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB99124205XA CN1134571C (en) | 1999-12-02 | 1999-12-02 | Measuring and control system of pavement smoothness (straightness) for paving machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB99124205XA CN1134571C (en) | 1999-12-02 | 1999-12-02 | Measuring and control system of pavement smoothness (straightness) for paving machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1255572A CN1255572A (en) | 2000-06-07 |
| CN1134571C true CN1134571C (en) | 2004-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB99124205XA Expired - Fee Related CN1134571C (en) | 1999-12-02 | 1999-12-02 | Measuring and control system of pavement smoothness (straightness) for paving machine |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101831862B (en) * | 2009-03-11 | 2013-03-13 | 南京理工大学 | Laser high-speed detection system for road surface deflection |
| DE102010039471B4 (en) | 2010-08-18 | 2014-02-13 | Robert Bosch Gmbh | Method and device for determining a lifting height of a working machine |
| DE102014012836B4 (en) * | 2014-08-28 | 2018-09-13 | Wirtgen Gmbh | Self-propelled construction machine and method for visualizing the processing environment of a construction machine moving in the field |
| CN104930990B (en) * | 2015-06-23 | 2018-09-14 | 广西大学 | Road surface imaging device and method |
| CN106323203A (en) * | 2015-06-29 | 2017-01-11 | 罗伯特·博世有限公司，香港 | Surface flatness indicating method and device |
| CN109458937A (en) * | 2018-12-25 | 2019-03-12 | 浙江晶科能源有限公司 | Measure method, apparatus, system and the storage medium of grid line height and width |
| CN111156932B (en) * | 2020-03-10 | 2021-08-27 | 凌云光技术股份有限公司 | Mirror surface material roughness detection device |
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1999
- 1999-12-02 CN CNB99124205XA patent/CN1134571C/en not_active Expired - Fee Related
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