CN216081339U - Large-diameter pipeline online diameter measuring device based on laser distance measurement - Google Patents
Large-diameter pipeline online diameter measuring device based on laser distance measurement Download PDFInfo
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- CN216081339U CN216081339U CN202122747949.6U CN202122747949U CN216081339U CN 216081339 U CN216081339 U CN 216081339U CN 202122747949 U CN202122747949 U CN 202122747949U CN 216081339 U CN216081339 U CN 216081339U
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Abstract
The utility model relates to an on-line diameter measuring device for a large-diameter pipeline based on laser distance measurement, which comprises a base frame, a lifting drive unit and a first laser distance measurement array, wherein the base frame is provided with a plurality of laser distance measurement units; the middle part of the base frame is provided with a groove, so that the base frame is in an inverted concave shape, and a pipeline to be measured is positioned in the groove; the first laser ranging array comprises at least three laser ranging sensors at equal intervals, the first laser ranging array is positioned on one side of the base frame, and the measuring point of each laser ranging sensor is positioned on the horizontal middle axial surface of the pipeline to be measured; four end angles of the base frame are provided with lifting drive units. The device obtains the pipe diameter of the pipeline to be measured by measuring the distance between the outer surface of the pipeline to be measured and the laser ranging sensor, is used for measuring the pipe diameter in real time in the pipeline production process, and can simultaneously meet the requirements of online measurement and real-time display of the diameter and the roundness of the pipeline.
Description
Technical Field
The utility model belongs to the technical field of pipeline measurement, and particularly relates to an on-line diameter measuring device for a large-diameter pipeline based on laser distance measurement, which is particularly suitable for measuring the diameter of a spiral welded pipe.
Background
The pipe diameter and the roundness are main factors influencing the performance and the quality of a large-diameter pipeline, and particularly for welded steel pipes represented by spiral welded pipes, the diameter fluctuation and the roundness deviation directly influence the performance and the quality of products, so that the technical problem to be solved is to measure the diameter and the roundness of the large-diameter pipeline in real time in the preparation process.
At present, measuring tools such as calipers, micrometers, measuring tapes, circumference calipers and the like are generally adopted to manually measure the diameter of the expanded diameter pipeline, but the traditional measuring method is greatly influenced by production environment, measuring tool accuracy and whether measurement of operators is standard or not, so that the defects of low measuring accuracy, low measuring speed, low measuring efficiency, high labor intensity of workers and the like exist, and the outer diameter condition of the whole large diameter pipeline in the production process cannot be fully reflected. Except the traditional measuring method, the diameter of a large-diameter pipeline can be measured by adopting a large-diameter measuring instrument, the large-diameter measuring instrument can adapt to pipelines with different diameter ranges, the detection precision is high, but the large-diameter measuring instrument is large in size, a shielding object cannot exist during detection, the large-diameter measuring instrument is high in cost and maintenance cost, has high requirements for production environment, and cannot be suitable for real-time measurement in the production process.
Patent application No. 202020531259.X discloses an on-line diameter and roundness monitoring device for an expanded diameter pipeline, which comprises a base, a frame, a computer, a pipeline diameter measuring assembly and a pipeline roundness measuring assembly; aiming at diameter measurement of an expanded diameter pipeline, the patent proposes that a flexible rule, a flexible rule tightening device, a photographing camera and a laser generator are used for completing perimeter data acquisition of the expanded diameter pipeline, the process can be briefly summarized as tightening the flexible rule to be tightly attached to the surface of the pipeline, the laser generator marks the flexible rule data, the photographing camera photographs a flexible rule picture and sends the obtained data to a computer, the computer obtains the perimeter by performing difference processing on the data, the diameter of the expanded pipeline is obtained by processing according to a perimeter formula L which is 2 pi R, and the diameter is displayed on a computer interaction interface; and aiming at the roundness, scanning the cross section of the expanded pipeline in parallel in four directions by using four laser ranging devices, sending the scanned data to a computer, and obtaining the roundness of the expanded pipeline by the computer through data fitting and displaying the roundness on a computer interaction interface. The device has the following disadvantages: 1) the device can only detect after the pipeline production is finished, and many factories may need to detect in the pipeline production process, so the application range is limited. 2) The diameter measurement mode of the device is very loaded down with trivial details, when measuring a pipeline, just need the tape motor that resets, puts into the pipeline, opens the tape motor and tightens up the tape and make it hug closely the pipeline surface, then opens the measurement, resets the tape motor after the measurement is accomplished, and its process is too loaded down with trivial details. 3) The device has low precision in diameter measurement mode, uses a measuring tool of a flexible rule, cannot reach a high degree due to instrument limitation, and greatly influences the authenticity of measured diameter data when the surface of a pipeline is not flat or the pipeline is locally deformed.
The patent with the application number of 202021193397.8 discloses an online quick detection device of many specifications of movable pipeline diameter and circularity, including running gear, detection mechanism and track mechanism. The device has two main characteristics: firstly, the moving capability of the pipeline detection device is increased, so that the pipeline detection device can automatically detect all cross sections of the pipeline and obtain data; and secondly, the diameter and the roundness of the pipelines with different diameters are measured by combining an angle sensor with a transmission mechanism. The device has the following disadvantages: 1) the measurement of the movement of the pipe measuring device brings many errors to the measurement process, and the patent does not describe the type and solution of the errors. 2) The device can not ensure whether the diameter and the roundness of the pipeline are accurately measured, the device does not mention the problem of how to ensure the coaxiality of the pipeline and the pipeline measuring device mentioned in the patent, and if the pipeline can not be ensured to be coaxial with the pipeline measuring device in the detection process, all measured data can not be used.
Therefore, the real-time measurement of the diameter and the roundness in the production process of the high-precision, non-contact and on-line monitoring device is urgently needed for the actual requirements of the measurement of the pipe diameter and the roundness of the large-diameter pipeline.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model aims to solve the technical problem of providing the large-diameter pipeline online diameter measuring device based on laser distance measurement.
In order to achieve the purpose, the utility model adopts the following technical scheme:
an on-line diameter measuring device for a large-diameter pipeline based on laser distance measurement is characterized by comprising a base frame, a lifting drive unit and a first laser distance measurement array; the middle part of the base frame is provided with a groove, so that the base frame is in an inverted concave shape, and a pipeline to be measured is positioned in the groove; the first laser ranging array comprises at least three laser ranging sensors at equal intervals, the first laser ranging array is positioned on one side of the base frame, and the measuring point of each laser ranging sensor is positioned on the horizontal middle axial surface of the pipeline to be measured; four end angles of the base frame are provided with lifting drive units.
The device also comprises a lead screw frame, a lead screw, a slide block, a first servo motor, a second servo motor and a support shaft; the screw frame is arranged on the base frame, the screw and the support shaft are both arranged on the screw frame, the first servo motor and the second servo motor are positioned at two ends of the screw frame, and output shafts of the two servo motors are respectively connected with two ends of the screw; at least three sliding blocks are arranged on the lead screw at equal intervals, and each sliding block is provided with a laser ranging sensor.
Each lifting driving unit comprises an industrial speed reducing motor and a first lead screw lifter; an output shaft of the industrial speed reducing motor is connected with one end of a horizontal rotating shaft of the first lead screw lifter, and the upper end of a vertical rotating shaft of the first lead screw lifter is fixedly connected with the base frame.
The lifting driving unit further comprises a connecting shaft and a second lead screw lifter; one end of the connecting shaft is connected with the other end of the horizontal rotating shaft of the first lead screw lifter, the other end of the connecting shaft is connected with the horizontal rotating shaft of the second lead screw lifter, and the two lead screw lifters form a linkage type lifter.
The device still includes second laser rangefinder array, and second laser rangefinder array and first laser rangefinder array symmetry are installed in the both sides of bed frame, and each laser rangefinder sensor of second laser rangefinder array and each laser rangefinder sensor one-to-one of first laser rangefinder array.
Compared with the prior art, the utility model has the advantages and positive effects that:
1. according to the large-diameter pipeline online diameter measuring device based on laser distance measurement, the pipe diameter of the pipeline to be measured is obtained by measuring the distance between the outer surface of the pipeline to be measured and the laser distance measuring sensor, the pipe diameter is measured in real time in the pipeline production process, and online measurement and real-time display of the diameter and the roundness of the pipeline can be simultaneously met.
2. Through four lift drive units for the bulk unit provides sufficient holding power, can also accomplish the whole lift of bed frame to help laser rangefinder array location, in order to adapt to the not pipeline of equidimension.
3. The double motors are used for driving the lead screw to rotate, so that the defect of insufficient torque caused by driving the lead screw by the single motor is overcome on the premise of not increasing the volume of the motor and the torque of the motor, and the accurate positioning on the slide block lead screw is ensured.
4. Compared with the traditional manual measurement by workers, the device not only improves the measurement precision, realizes the detection automation and greatly saves the time cost, but also saves the labor force for factories and improves the overall economic benefit of the factories; compared with a modern large-caliber measuring instrument, the device greatly reduces the factory cost and can meet the requirements of the detection precision of the diameter and the roundness of the large-caliber pipeline.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention at an angle;
FIG. 2 is a schematic view of the overall structure of the present invention at another angle;
FIG. 3 is a schematic structural diagram of a lift drive assembly of the present invention;
FIG. 4 is a schematic structural diagram of a laser ranging array according to the present invention;
FIG. 5 is a schematic diagram of the present invention;
in the figure, 1-industrial gear motor; 2-a first lead screw lifter; 3-a second lead screw elevator; 4, connecting the shaft; 5, a base frame; 6-a pipe to be measured; 7-a first servo motor; 8, a sliding block; 9-a screw frame; 10-laser ranging sensor; 11-a second servo motor; 12-a lead screw; 501-grooves.
Detailed Description
The technical solution of the present invention is described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited thereto.
The utility model relates to an on-line diameter measuring device (a device for short, see figures 1-5) for a large-diameter pipeline based on laser distance measurement, which comprises a pedestal 5, a lifting drive unit and a first laser distance measurement array; the middle of the base frame 5 is provided with a groove 501, so that the base frame 5 is in an inverted concave shape, the pipeline 6 to be measured is positioned in the groove 501, the axial direction of the pipeline 6 to be measured is parallel to the length direction of the groove 501, the size of the groove 501 can accommodate the pipeline 6 to be measured, and the groove 501 is ensured not to influence the advancing motion of the pipeline 6 to be measured; the first laser ranging array is composed of at least three laser ranging sensors 10 with equal intervals, and the number of the laser ranging sensors is six in the embodiment; the first laser ranging array is arranged on one side of the base frame 5, and the measuring point of each laser ranging sensor 10 is positioned on the horizontal middle axial surface of the pipeline 6 to be measured; four end angles of bed frame 5 all are equipped with lift drive unit for drive bed frame 5 goes up and down, and the measuring point of laser range sensor 10 all is located the level of surveying measuring pipeline 6 on the axial plane when guaranteeing to measure the pipeline of different pipe diameters.
Each lifting driving unit comprises an industrial speed reducing motor 1 and a first lead screw lifter 2; on industry gear motor 1 passes through the fixed ground of flange or operation panel, industry gear motor 1's output shaft passes through the shaft coupling and is connected with the one end of first lead screw lift 2's horizontal rotation axis, the upper end of first lead screw lift 2's vertical rotation axis links firmly with bed frame 5 through the flange, the flange can slide on first lead screw lift 2's vertical rotation axis, the lower extreme of first lead screw lift 2's vertical rotation axis is fixed on ground or operation panel, first lead screw lift 2 converts the power of industry gear motor 1 into the vertical thrust that promotes bed frame 5 lift.
The lifting driving unit also comprises a connecting shaft 4 and a second screw rod lifter 3; one end of the connecting shaft 4 is connected with the other end of the horizontal rotating shaft of the first lead screw lifter 2 through a coupler, and the other end of the connecting shaft 4 is connected with the horizontal rotating shaft of the second lead screw lifter 3 through a coupler; the two lead screw lifters form a linkage type lifter, and the linkage type lifter has the function of supporting the whole device while providing the upper and lower freedom degrees of the base frame 5.
The device also comprises a lead screw frame 9, a lead screw 12, a slide block 8, a first servo motor 7, a second servo motor 11 and a supporting shaft (not shown in the figure); the lead screw frame 9 is fixed on the base frame 5, the lead screw 12 and two support shafts are both arranged on the lead screw frame 9, and the two support shafts are positioned at two sides of the lead screw 12; the first servo motor 7 and the second servo motor 11 are fixed at two ends of the screw rod frame 9, and output shafts of the two servo motors are respectively connected with two ends of a screw rod 12 through couplers; the two servo motors drive the screw 12 to rotate, so that the torque for driving the screw 12 is enough on the premise of not increasing the torque and the volume of a single servo motor, and meanwhile, the uneven weight distribution of the whole device is avoided, and the stability of the device is ensured; at least three sliding blocks 8 are equidistantly installed on the screw rod 12, a laser ranging sensor 10 is fixed on each sliding block 8, and the measuring point of each laser ranging sensor 10 is located on the horizontal middle axial surface of the pipeline 6 to be measured.
The device also comprises a second laser ranging array, wherein the second laser ranging array and the first laser ranging array are symmetrically arranged on two sides of the base frame 5, each laser ranging sensor of the second laser ranging array corresponds to each laser ranging sensor 10 of the first laser ranging array one by one, and errors generated by the offset of the pipeline 6 to be measured are eliminated through the second laser ranging array.
The working principle and the working process of the utility model are as follows:
as shown in fig. 5, it is described by taking an example that each laser ranging array includes six laser ranging sensors, and the measurement points corresponding to the six laser ranging sensors are a to f; equally dividing points 1-6 on the circumference of any section of the pipeline to be measured, wherein the point 1 is superposed with the point a; the equal division point of the cross section circle is 1 'to 6' after the pipeline to be measured rotates for one circle, the time for the pipeline to be measured to rotate for one circle is T, in the process that the pipeline to be measured rotates for one circle, the laser sensors 1 to 6 respectively measure the distance data of the points 1, 2, 3, 4, 5 and 6 at the points a, b, c, d, e and f at the time points of 0, T/6, T/3, T/2, 2T/3 and 5T/6, and the diameter of the points 1 to 6 is obtained through calculation.
Let the standard diameter L of the pipe 6 to be measured, the circumferential rotation speed V1Axial traveling velocity V2The time of one rotation of the pipeline 6 to be measured is T, the distance traveled by the pipeline 6 to be measured in the T time is X, and the distance between two adjacent laser ranging sensors 10 is X1The distance between two adjacent sliding blocks 8 is X2Then, there is T ═ 2 π × (L/2)]/V1＝πL/V1(ii) a The distance traveled by the pipeline 6 to be measured in the T time is X ═ V2*T＝πLV2/V1Thus the distance X between two adjacent laser ranging sensors 101＝X/6＝πLV2/(6V1)；
According to the installation position and the distance X between the sliding block 8 and the laser ranging sensor 101Obtaining the distance X between two adjacent sliding blocks 8 on the same side of the base frame 52According to the distance X2Manually adjusting the positions of two adjacent sliding blocks 8 on the screw 12; the computer obtains the height H required by the laser ranging sensor 10 according to the standard diameter L of the pipeline 6 to be measured and the height to the ground, and controls the four industrial speed reduction motors 1 to rotate so as to adjust the height of the base frame 5, thereby ensuring that the measuring points of all the laser ranging sensors 10 are coplanar with the horizontal middle axial plane of the pipeline 6 to be measured, and the plane where the measuring points of all the laser ranging sensors 10 are located is parallel to the ground. The computer controls the first servo motor 7 and the second servo motor 11 to drive the screw rod 12 to rotate, drives the sliding block 8 and the laser sensor 10 to reach the designated position, and ensures that the positions of the upper laser ranging sensor 10 of the first laser ranging array and the laser ranging sensor on the second laser ranging array are strictly symmetrical.
Obtaining a measured value of the diameter of the pipeline according to the installation distance of the two opposite laser ranging sensors 10 at the point a and the measured distance data, and measuring the diameter of the pipeline to be measured; six pipeline diameter measured values of the pipelines to be measured at the points b-f can be obtained in the same way; the pipeline measured values at the points a-f are substantially the pipeline measured values at the points 1-6; the six measured values are respectively substituted into a general equation of the circle to obtain a fitted cross-section circle, and the cross-section circle is displayed on a display screen of a computer in real time, so that the observation of workers is facilitated. The laser ranging sensor measures distance at a certain sampling frequency, measured data are transmitted to the computer in real time, the computer receives the data and then obtains the pipe diameter and the roundness of the pipeline to be measured according to the process, and the roundness is the difference between the maximum radius and the minimum radius; at the same time the fitted cross-sectional circle will also be displayed on the screen and both the raw data and the processed data will be stored for subsequent viewing and use.
If the pipeline 6 to be measured has defects such as recess, the computer processes the data and then knows that the problem part is scanned, the computer immediately controls the laser ranging sensor to increase power consumption, increases sampling frequency, sends the acquired data of the problem part to the computer in real time, the computer stores the data and analyzes the data, and gives the problem type and related problem parameters such as maximum recess depth and the like according to a defect identification program. When the problem part is scanned, the computer controls the sampling frequency of the laser ranging sensor to be reduced, and the power consumption is reduced. If the pipeline to be measured is not sunken, the laser ranging sensor always keeps working at a normal sampling frequency, and if no defect is found after the whole pipeline to be measured is detected, the pipe diameter and the roundness accord with the standard, and the pipeline to be measured has no dark injury. When the adopted frequency of the laser ranging sensors is high enough or the number of the laser ranging sensors is increased, the whole pipeline to be measured can be fitted.
The device is used for measuring the pipe diameter in the pipeline production process, in particular to a spiral welded pipe which rotationally advances when being produced; the device can roll up the system welding good part at the spiral welded tube and detect, can not only give and in time discover whether up to standard spiral welded tube, can also be when the discovery problem, in time judge the normal error that pipeline production appears according to the feedback of result, still because other factors such as the production machine has appeared the problem make pipeline production great error appear.
Nothing in this specification is said to apply to the prior art.
Claims (5)
1. An on-line diameter measuring device for a large-diameter pipeline based on laser distance measurement is characterized by comprising a base frame, a lifting drive unit and a first laser distance measurement array; the middle part of the base frame is provided with a groove, so that the base frame is in an inverted concave shape, and a pipeline to be measured is positioned in the groove; the first laser ranging array comprises at least three laser ranging sensors at equal intervals, the first laser ranging array is positioned on one side of the base frame, and the measuring point of each laser ranging sensor is positioned on the horizontal middle axial surface of the pipeline to be measured; four end angles of the base frame are provided with lifting drive units.
2. The laser ranging-based large-caliber pipeline online diameter measuring device according to claim 1, further comprising a lead screw frame, a lead screw, a slide block, a first servo motor, a second servo motor and a support shaft; the screw frame is arranged on the base frame, the screw and the support shaft are both arranged on the screw frame, the first servo motor and the second servo motor are positioned at two ends of the screw frame, and output shafts of the two servo motors are respectively connected with two ends of the screw; at least three sliding blocks are arranged on the lead screw at equal intervals, and each sliding block is provided with a laser ranging sensor.
3. The laser ranging-based large-caliber pipeline online diameter measuring device according to claim 1, wherein each lifting driving unit comprises an industrial speed reduction motor and a first lead screw lifter; an output shaft of the industrial speed reducing motor is connected with one end of a horizontal rotating shaft of the first lead screw lifter, and the upper end of a vertical rotating shaft of the first lead screw lifter is fixedly connected with the base frame.
4. The laser ranging-based large-caliber pipeline online diameter measuring device according to claim 3, wherein the lifting drive unit further comprises a connecting shaft and a second lead screw lifter; one end of the connecting shaft is connected with the other end of the horizontal rotating shaft of the first lead screw lifter, the other end of the connecting shaft is connected with the horizontal rotating shaft of the second lead screw lifter, and the two lead screw lifters form a linkage type lifter.
5. The laser ranging-based large-caliber pipeline online diameter measuring device according to claim 1, further comprising a second laser ranging array, wherein the second laser ranging array and the first laser ranging array are symmetrically arranged on two sides of the base frame, and each laser ranging sensor of the second laser ranging array corresponds to each laser ranging sensor of the first laser ranging array in a one-to-one manner.
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| CN202122747949.6U CN216081339U (en) | 2021-11-11 | 2021-11-11 | Large-diameter pipeline online diameter measuring device based on laser distance measurement |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122747949.6U CN216081339U (en) | 2021-11-11 | 2021-11-11 | Large-diameter pipeline online diameter measuring device based on laser distance measurement |
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| CN202122747949.6U Active CN216081339U (en) | 2021-11-11 | 2021-11-11 | Large-diameter pipeline online diameter measuring device based on laser distance measurement |
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