CN112379121A - Speed measurement metering method and system for online production pipeline - Google Patents
Speed measurement metering method and system for online production pipeline Download PDFInfo
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- CN112379121A CN112379121A CN202011273256.1A CN202011273256A CN112379121A CN 112379121 A CN112379121 A CN 112379121A CN 202011273256 A CN202011273256 A CN 202011273256A CN 112379121 A CN112379121 A CN 112379121A
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 238000005259 measurement Methods 0.000 title claims abstract description 17
- 238000005520 cutting process Methods 0.000 claims abstract description 24
- 239000006229 carbon black Substances 0.000 claims description 25
- 238000009826 distribution Methods 0.000 claims description 22
- 230000003321 amplification Effects 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 238000000827 velocimetry Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 230000001788 irregular Effects 0.000 description 2
- 239000012779 reinforcing material Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 239000003550 marker Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/64—Devices characterised by the determination of the time taken to traverse a fixed distance
- G01P3/68—Devices characterised by the determination of the time taken to traverse a fixed distance using optical means, i.e. using infrared, visible, or ultraviolet light
Abstract
The invention is suitable for the technical field of pipe manufacturing, and provides a speed measurement metering method and a system for an online production pipeline. Compared with the prior art, the method has the advantages that the method for calculating the pipeline conveying speed and length by the length recording wheel is more accurate, and the fixed-length cutting of the pipeline can be realized.
Description
Technical Field
The invention belongs to the technical field of pipe manufacturing, and particularly relates to a speed measurement metering method and system for an online production pipeline.
Background
The pipe is required to be cut according to requirements in the manufacturing process, the cut length is measured through a length measuring wheel, the length measuring wheel is in friction contact with the pipe, the length measuring wheel rotates along with the movement of the pipe in the conveying process of the pipe, the length measuring wheel is connected with an encoder, the encoder calculates the conveying distance of the pipe according to the circumference of the length measuring wheel and the number of rotating turns, and therefore the cutting position is determined, and the length of the pipe is required to be cut.
However, after the length-recording wheel is used for a long time, the friction performance of the contact surface of the length-recording wheel and the pipe is gradually reduced, and even the length-recording wheel slips, so that the encoder can perform wrong measurement, the measurement result is inaccurate, and the cutting length of the pipe is inaccurate.
Disclosure of Invention
The invention provides a speed measurement and metering method and system for an online production pipeline, and aims to solve the technical problems.
The invention is realized in this way, a speed measuring and metering method for on-line production of pipelines, and the pipeline conveying process on a conveyor belt comprises the following steps:
the method comprises the steps that a first image acquisition module acquires a pipeline surface image within a range and records first time when the pipeline surface image is acquired;
the second image acquisition module shoots the surface picture of the pipeline frame by frame;
comparing the pipeline surface image with the pipeline surface picture, and recording a second time when the pipeline surface image is consistent with the pipeline surface picture;
and calculating the conveying speed of the pipeline according to the time difference between the second time and the first time and the distance between the first image acquisition module and the second image acquisition module.
Further, acquiring the pipeline surface image within the range further comprises:
amplifying the pipeline surface image by 70 times of pixels, and recording the quantity and distribution of carbon black in the amplified pipeline surface image;
the frame-by-frame shooting of the pipeline surface picture further comprises:
and amplifying the pipeline surface picture by 70 times of pixels, and recording the quantity and distribution of carbon black in the amplified pipeline surface picture.
Further, comparing the pipe surface image to the pipe surface picture further comprises:
and designating a comparison area, and comparing the quantity and distribution of the carbon black in the comparison area in the pipeline surface image and the pipeline surface picture.
Further, after calculating the conveying speed of the pipeline, the method further comprises:
and recording the delay time after the second time, and calculating the cutting length of the pipeline according to the conveying speed and the delay time.
Furthermore, when the pipe surface image is consistent with the pipe surface picture, the method further comprises:
the first image acquisition module acquires a next pipeline surface image within range.
The invention also provides a speed measurement and metering system for the online production pipeline, which comprises: the first camera and the second camera are arranged along the conveying direction of the pipeline, and the first camera is close to the incoming direction of the pipeline;
the first camera comprises a first image acquisition module, and is used for acquiring a pipeline surface image within a range and recording first time when the pipeline surface image is acquired;
the second camera comprises a second image acquisition module for shooting the surface picture of the pipeline frame by frame;
further comprising:
the first data comparison module is used for comparing the pipeline surface image with the pipeline surface picture and recording a second time when the pipeline surface image is consistent with the pipeline surface picture;
and the first data calculation module is used for calculating the conveying speed of the pipeline according to the time difference between the second time and the first time and the distance between the first image acquisition module and the second image acquisition module.
Further, the first camera further comprises:
the image amplification module is used for amplifying the pipeline surface image by 70 times of pixels and recording the quantity and distribution of carbon black in the amplified pipeline surface image;
the second camera further includes:
and the picture amplifying module is used for amplifying the picture on the surface of the pipeline by 70 times of pixels and recording the quantity and distribution of carbon black in the amplified picture on the surface of the pipeline.
Still further, still include:
and the second data comparison module is used for designating a comparison area and comparing the quantity and distribution of the carbon black in the comparison area in the pipeline surface image and the pipeline surface picture.
Still further, still include:
and the second data calculation module is used for recording the delay time after the second time and calculating the cutting length of the pipeline according to the conveying speed and the delay time.
Further, the first camera acquires a next pipe surface image within a range while the pipe surface image is consistent with the pipe surface picture.
The invention provides a speed measurement metering method and system for an online production pipeline, which utilize two image acquisition modules to respectively acquire a pipeline surface image and shoot a pipeline surface picture, the distance between the two image acquisition modules is fixed and known, during the pipeline conveying process, the first image acquisition module acquires a pipeline surface image, the second image acquisition module shoots the pipeline surface frame by frame and searches for a pipeline surface picture, namely an image, which is consistent with the pipeline surface image, when the consistent image is found, the conveying speed of the pipeline can be calculated according to the distance between the two image acquisition modules, the acquisition time of the pipeline surface image and the time difference when the consistent image is found, and further, the length of the pipeline to be cut can be calculated according to the speed, the time when the consistent image is found and the delay time of the time. Compared with the prior art, the method has the advantages that the method for calculating the pipeline conveying speed and length by the length recording wheel is more accurate, and the fixed-length cutting of the pipeline can be realized.
Drawings
FIG. 1 is a schematic flow chart of a method for measuring speed of an on-line production pipeline according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a pipeline fixed length marking provided by an embodiment of the present invention;
FIG. 3 is a diagram of a first pipeline surface view according to an embodiment of the present invention;
FIG. 4 is a diagram of a second pipeline surface view provided by an embodiment of the present invention;
FIG. 5 is a schematic view of a third exemplary embodiment of a surface of a duct;
fig. 6 is a schematic structural diagram of a speed measurement and metering system for an on-line production pipeline according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the invention provides a speed measurement metering method for online pipeline production, which is used for measuring the conveying speed of a pipeline and the conveying distance of the pipeline to determine the cutting position and cutting the pipeline at a fixed length, and comprises the following steps in the process of conveying the pipeline on a conveying belt:
the first image acquisition module acquires a pipeline surface image within a range, and records the first time when the pipeline surface image is acquired.
The pipe is doped with some reinforcing materials in the manufacturing process to improve various performances of the pipe, irregular textures are formed on the surface of the pipe in the processes of doping materials and extruding the pipe, the textures on various parts of the surface of the pipe are different, and the irregular textures can be used as position marks on the surface of the pipe. Accordingly, as shown in fig. 1, a first camera 1 having a first image acquisition module is used to acquire an image of the surface of the pipe within the field of view of the module, i.e., a position marker of the pipe 01 at that location. While the pipe surface image is being acquired, the time at which the pipe surface image was acquired, i.e., the first time, is recorded.
The second image acquisition module shoots the surface picture of the pipeline frame by frame.
And a second camera 2 with a second image acquisition module is adopted to continuously acquire pictures in the visual field range, and when the pipeline 01 enters the visual field range, the pictures on the surface of the pipeline can be continuously acquired frame by frame.
For more accurate marking of the location of the pipe by the image, acquiring an image of the surface of the pipe within the range further comprises:
and amplifying the pipeline surface image by 70 times of pixels, and recording the quantity and distribution of carbon black in the amplified pipeline surface image.
The frame-by-frame shooting of the pipeline surface picture further comprises:
and amplifying the pipeline surface picture by 70 times of pixels, and recording the quantity and distribution of carbon black in the amplified pipeline surface picture.
When the carbon black is doped in the pipeline as the reinforcing material, the first image acquisition module and the second image acquisition module which adopt the high-definition camera and have the image amplification function respectively acquire the surface image and the surface picture of the pipeline, as shown in fig. 3, the number and the distribution of the carbon black on the surface of the pipeline are different at different positions of the pipeline, therefore, the number and the distribution of the carbon black are used for judging whether the surface image and the surface picture of the pipeline are consistent, so that the judgment basis is clearer, the data quantity of comparison can be reduced, the judgment time is shortened, and the measurement error is reduced.
And comparing the pipeline surface image with the pipeline surface picture, and recording a second time when the pipeline surface image is consistent with the pipeline surface picture.
The pipeline surface image acquired by the first image acquisition module is compared with the pipeline surface image shot by each frame of the second image acquisition module one by one, when the pipeline 01 with the pipeline surface image acquired by the first image acquisition module moves to the position below the second image acquisition module, the pipeline surface image is consistent with the pipeline surface image, and the time when the pipeline surface image is consistent with the pipeline surface image, namely the second time, is recorded.
In order to further increase the speed of comparing the pipe surface image with the pipe surface picture, comparing the pipe surface image with the pipe surface picture further comprises:
and designating a comparison area, and comparing the quantity and distribution of the carbon black in the comparison area in the pipeline surface image and the pipeline surface picture.
As shown in fig. 3 and 4, when comparing the pipe surface image and the pipe surface picture, it is possible to compare the amount of carbon black and the distribution of carbon black in a circular or square area by designating the area as the basis for determining whether they are consistent.
And calculating the conveying speed of the pipeline according to the time difference between the second time and the first time and the distance between the first image acquisition module and the second image acquisition module.
Since the distance between the first image acquisition module and the second image acquisition module is fixed and known, the conveying speed of the pipeline can be calculated according to the distance and the time difference between the second time and the first time. And then can calculate the pipeline according to the transport speed and carry long the time transport distance in a certain time, be convenient for carry out the fixed length cutting to the pipeline.
Specifically, after the calculation of the conveying speed of the pipeline, the method further comprises the following steps:
and recording the delay time after the second time, and calculating the cutting length of the pipeline according to the conveying speed and the delay time.
When the pipeline surface image and the pipeline surface picture are judged to be consistent, the time point, namely the second time is recorded, the second time is taken as the starting time point, the time after the time point is the delay time length, the conveying speed of the pipeline 01 is calculated, then the distance of the pipeline 01 after the position corresponding to the vertical direction away from the second image acquisition module can be calculated according to the delay time length, the distance is taken as the cutting length of the pipeline 01, the cutting point is shown as a mark 3 in fig. 1, and of course, the cutting point can also be arranged at other positions.
In addition, in order to mark the pipeline 01 equidistantly and facilitate the subsequent cutting operation of the pipeline 01, when the pipeline surface image is consistent with the pipeline surface picture, the method further comprises the following steps:
the first image acquisition module acquires a next pipeline surface image within range.
As shown in fig. 2, when the pipeline surface image is consistent with the pipeline surface picture, the first image obtaining module obtains the next pipeline surface image within the range as the next object to be compared with the pipeline surface picture, since the distance between the first image obtaining module and the second image obtaining module is fixed, the pipeline 01 can be marked equidistantly, when in practical application, the distance can be set to 1m, when the lengths of the commonly used pipelines, such as 2m, 3m, 5m and 8m, need to be obtained by cutting, the distance from the right side of the pipeline 01 shown in fig. 1 to the vertical direction position of the second image obtaining module can be obtained by calculating the times that the pipeline surface image is consistent with the pipeline surface picture, for example, when the pipeline surface image is consistent with the pipeline surface picture for the first time, the distance from the right side of the pipeline 01 is 0, when the pipeline surface image is consistent for the second time, the distance is 1m, the third time of coincidence, the distance is 2m, and so on.
When the pipeline surface image acquired by the first image acquisition module is at the position a and the position d as shown in fig. 2, only half or part of the pipeline surface image belongs to the image of the pipeline 01, so that the comparison can be performed by adopting the manner of specifying a comparison area in comparison, as shown in fig. 5, when the pipeline surface image at the position a and the position d is compared with the pipeline surface picture, a rectangular area in the left half or the right half of the picture can be specified as the comparison area, and the amount of carbon black and the distribution of carbon black in the area can be compared.
In particular, when the pipeline 01 needs to stop conveying the pipeline when being cut, and needs to continue conveying the pipeline after the cutting is finished, the pipeline 01 can be clamped and conveyed by a mechanical arm, but the existing part of conveying equipment cannot reach the conveying speed before the cutting when being started again after the cutting, for example, a conveyor belt conveying mode, causes the calculated cutting length by only using the delay time length and the calculated pipeline conveying speed to be inconsistent, and the conveying mode can also cause the pipeline 01 to slip on the conveyor belt when being suddenly stopped and instantly started, so that the measurement is inaccurate, in this case, the cutting length can be determined by combining the equidistant marking mode and the delay time length mode, specifically, when the pipeline surface image is consistent with the pipeline surface image during the conveying process of the pipeline 01, the consistent time, namely the second time, is recorded by using the second time as the starting point, meanwhile, the first image acquisition module acquires the next pipeline surface image to carry out equidistant marking on the pipeline 01, and when the actual time length reaches the theoretical delay time length and the next one or more pipeline surface images reach the second image acquisition module and are judged to be consistent, the pipeline 01 is considered to reach the cutting point.
As shown in fig. 6, an embodiment of the present invention further provides a system for measuring speed and metering for an online production pipeline, where the system executes the above method for measuring speed and metering for an online production pipeline, and the system includes: the pipeline conveying device comprises a first camera and a second camera, wherein the first camera and the second camera are arranged along the conveying direction of a pipeline, and the first camera is close to the direction of the pipeline.
The first camera includes a first image acquisition module 100, configured to acquire a pipeline surface image within a range, and record a first time when the pipeline surface image is acquired.
And the image amplification module 300 is used for amplifying the pipeline surface image by 70 times of pixels and recording the quantity and distribution of carbon black in the amplified pipeline surface image.
The second camera includes a second image acquisition module 200 for capturing a picture of the surface of the pipe frame by frame.
And the picture amplifying module 400 is used for amplifying the picture on the surface of the pipeline by 70 times of pixels and recording the quantity and distribution of carbon black in the amplified picture on the surface of the pipeline.
Further comprising:
the first data comparing module 500 is configured to compare the pipeline surface image with the pipeline surface picture, and record a second time when the pipeline surface image is consistent with the pipeline surface picture.
A second data comparison module 700 for specifying a comparison area and comparing the amount and distribution of carbon black in the comparison area in the pipeline surface image and the pipeline surface picture.
And the first data calculation module 600 is configured to calculate a conveying speed of the pipeline according to the time difference between the second time and the first time and the distance between the first image acquisition module and the second image acquisition module.
And a second data calculating module 800, configured to record a delay duration after the second time, and calculate a cutting length of the pipeline according to the conveying speed and the delay duration.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The speed measuring and metering method for the on-line production of the pipeline is characterized by comprising the following steps of:
the method comprises the steps that a first image acquisition module acquires a pipeline surface image within a range and records first time when the pipeline surface image is acquired;
the second image acquisition module shoots the surface picture of the pipeline frame by frame;
comparing the pipeline surface image with the pipeline surface picture, and recording a second time when the pipeline surface image is consistent with the pipeline surface picture;
and calculating the conveying speed of the pipeline according to the time difference between the second time and the first time and the distance between the first image acquisition module and the second image acquisition module.
2. The on-line production pipe velocity measurement and metering method according to claim 1, wherein the obtaining of the pipe surface image within the range further comprises:
amplifying the pipeline surface image by 70 times of pixels, and recording the quantity and distribution of carbon black in the amplified pipeline surface image;
the frame-by-frame shooting of the pipeline surface picture further comprises:
and amplifying the pipeline surface picture by 70 times of pixels, and recording the quantity and distribution of carbon black in the amplified pipeline surface picture.
3. The on-line production pipe velocimetry method according to claim 2, wherein comparing the pipe surface image with the pipe surface picture further comprises:
and designating a comparison area, and comparing the quantity and distribution of the carbon black in the comparison area in the pipeline surface image and the pipeline surface picture.
4. The method for measuring the speed and the metering speed for the on-line production pipeline according to claim 1, wherein the step of calculating the conveying speed of the pipeline further comprises the following steps:
and recording the delay time after the second time, and calculating the cutting length of the pipeline according to the conveying speed and the delay time.
5. The on-line production pipe velocity measurement and metering method according to claim 1, wherein when the pipe surface image is consistent with the pipe surface picture, the method further comprises:
the first image acquisition module acquires a next pipeline surface image within range.
6. The utility model provides an online production pipeline is with measurement system that tests speed which characterized in that includes: the first camera and the second camera are arranged along the conveying direction of the pipeline, and the first camera is close to the incoming direction of the pipeline;
the first camera comprises a first image acquisition module, and is used for acquiring a pipeline surface image within a range and recording first time when the pipeline surface image is acquired;
the second camera comprises a second image acquisition module for shooting the surface picture of the pipeline frame by frame;
further comprising:
the first data comparison module is used for comparing the pipeline surface image with the pipeline surface picture and recording a second time when the pipeline surface image is consistent with the pipeline surface picture;
and the first data calculation module is used for calculating the conveying speed of the pipeline according to the time difference between the second time and the first time and the distance between the first image acquisition module and the second image acquisition module.
7. The on-line production is speed-measuring measurement system for pipeline of claim 6, characterized in that, the first camera still includes:
the image amplification module is used for amplifying the pipeline surface image by 70 times of pixels and recording the quantity and distribution of carbon black in the amplified pipeline surface image;
the second camera further includes:
and the picture amplifying module is used for amplifying the picture on the surface of the pipeline by 70 times of pixels and recording the quantity and distribution of carbon black in the amplified picture on the surface of the pipeline.
8. The system of claim 7, further comprising:
and the second data comparison module is used for designating a comparison area and comparing the quantity and distribution of the carbon black in the comparison area in the pipeline surface image and the pipeline surface picture.
9. The system of claim 6, further comprising:
and the second data calculation module is used for recording the delay time after the second time and calculating the cutting length of the pipeline according to the conveying speed and the delay time.
10. The system of claim 6, wherein the first camera captures a next pipe surface image within range while the pipe surface image is consistent with the pipe surface frame.
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| CN202011273256.1A CN112379121A (en) | 2020-11-14 | 2020-11-14 | Speed measurement metering method and system for online production pipeline |
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| CN202011273256.1A CN112379121A (en) | 2020-11-14 | 2020-11-14 | Speed measurement metering method and system for online production pipeline |
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| CN103810676A (en) * | 2014-01-02 | 2014-05-21 | 北京科技大学 | Method for monitoring running speed of steel pipe |
| CN104268882A (en) * | 2014-09-29 | 2015-01-07 | 深圳市热活力科技有限公司 | High-speed moving object detecting and speed measuring method and system based on double-linear-array cameras |
| CN209673834U (en) * | 2019-04-08 | 2019-11-22 | 东北大学秦皇岛分校 | A kind of tubing optically measuring speeds device |
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2020
- 2020-11-14 CN CN202011273256.1A patent/CN112379121A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101281208A (en) * | 2007-04-06 | 2008-10-08 | 清华大学 | Cotton stream velocity on-line estimation method using video to measure speed in isomerism fibre sorting system |
| JP2013152219A (en) * | 2011-12-26 | 2013-08-08 | Japan Traffic Management Technology Association | Speed measurement system, speed measurement method and program |
| CN103810676A (en) * | 2014-01-02 | 2014-05-21 | 北京科技大学 | Method for monitoring running speed of steel pipe |
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