CN114396873A - Method and device for measuring geometric dimension of trapezoidal steel wire - Google Patents
Method and device for measuring geometric dimension of trapezoidal steel wire Download PDFInfo
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- CN114396873A CN114396873A CN202111652174.2A CN202111652174A CN114396873A CN 114396873 A CN114396873 A CN 114396873A CN 202111652174 A CN202111652174 A CN 202111652174A CN 114396873 A CN114396873 A CN 114396873A
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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
- G01B11/002—Measuring arrangements characterised by the use of optical techniques for measuring two or more coordinates
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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
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/2433—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures for measuring outlines by shadow casting
Abstract
A method for measuring the geometric dimension of a trapezoidal steel wire comprises the following steps: acquiring conversion parameters between sensor coordinate systems, and calibrating the sensors; determining conversion parameters between a workpiece coordinate system and a sensor coordinate system according to the position relation between a sensor and a workpiece in a measuring system, and unifying the sensor and the workpiece coordinate; establishing a sensor installation error model according to the measurement condition of the inclination of the sensor around each axis of the workpiece coordinate system; the measuring standard component corrects the installation error of the sensor in the measuring system; and measuring the trapezoidal steel wire to obtain the data of the profile dimension of the section. The invention can use the workpiece coordinate system parallel to the section of the trapezoidal steel wire to correct the measuring coordinate system of the four sensors, therefore, the laser planes of the sensors are not absolutely coplanar, and only approximate alignment is needed, thereby greatly reducing the installation requirement.
Description
Technical Field
The invention relates to the technical field of special-shaped steel wire detection, in particular to a method and a device for measuring the geometric dimension of a trapezoidal steel wire.
Background
The trapezoidal steel wire has wide application due to the characteristics of complex section shape, high dimensional accuracy, infinite length and the like, such as a die spring, an electronic equipment damping spring, a weapon exciter spring, a gasket and the like. With the development and application of the trapezoidal steel wire in various industries, the requirements on the geometric dimension of the section of the trapezoidal steel wire are obviously improved. The vernier caliper is basically used for measuring the size of the trapezoidal steel wire manually in China. The method has low detection efficiency and small data amount, and needs to intercept a section of steel wire from the production line for inspection, thereby damaging the product and the continuity of the production.
The line laser sensor provides a new technical means for the on-line measurement of the section size of the trapezoidal steel wire by the advantages of high resolution, high precision, high measurement speed, simple operation, lower cost and the like. The digital online detection of the trapezoidal steel wire by using the new technology can not only improve the measurement efficiency and precision and meet the requirement of 24-hour continuous production, but also has large detection data quantity, and the data is analyzed and fed back to the production, so that the production process, machine tool parameters and the like are optimized, and the method is a crucial step for transformation from traditional manufacturing to intelligent manufacturing of the trapezoidal steel wire.
Disclosure of Invention
The embodiment of the invention provides a method for measuring the geometric dimension of a trapezoidal steel wire, which is used for improving the precision and the efficiency of the geometric dimension measurement of the trapezoidal steel wire.
The specific technical scheme of the invention is as follows:
a method for measuring the geometric dimension of a trapezoidal steel wire is characterized by comprising the following steps:
acquiring conversion parameters between sensor coordinate systems, and calibrating the sensors;
determining conversion parameters between a workpiece coordinate system and a sensor coordinate system according to the position relation between a sensor and a workpiece in a measuring system, and unifying the sensor and the workpiece coordinate;
establishing a sensor installation error model according to the measurement condition of the inclination of the sensor around each axis of the workpiece coordinate system;
the measuring standard component corrects the installation error of the sensor in the measuring system;
and measuring the trapezoidal steel wire to obtain the data of the profile dimension of the section.
Determining conversion parameters between sensor coordinate systems, and calibrating the sensors, wherein the method comprises the following steps:
acquiring coordinates of two points in a common measurement area of a sensor; the two points are as far apart as possible;
and determining coordinate conversion parameters between sensor coordinate systems according to the two point coordinate values measured in each sensor, and converting the coordinates into a certain sensor coordinate system uniformly.
Determining conversion parameters between a workpiece coordinate system and a sensor coordinate system according to the position relation between the sensor and the workpiece, wherein the conversion parameters comprise:
establishing a virtual plane vertical to the longitudinal direction of the trapezoidal steel wire according to the direction parameters of the trapezoidal steel wire in the longitudinal direction under a world coordinate system; establishing a workpiece coordinate system by taking the middle point of the bottom edge of the trapezoidal steel wire as an original point and the bottom edge as an X axis;
determining direction parameters of a sensor coordinate system and a workpiece coordinate system according to the position relation between the sensor and the trapezoidal steel wire; determining the coordinate value of the origin of the workpiece coordinate system under the sensor coordinate system;
and determining conversion parameters between the workpiece coordinate system and the sensor coordinate system according to the information, and unifying the sensor coordinate system and the workpiece coordinate system.
According to the measurement condition that the sensor inclines around each axis of the workpiece coordinate system, a sensor installation error model is established, and the method comprises the following steps:
according to the measured value of the sensor inclined around the x axis of the workpiece coordinate system, the mathematical relation between the included angle of the sensor coordinate system and the y axis of the workpiece coordinate system and the measured value;
according to the measured value of the sensor inclined around the y axis of the workpiece coordinate system, the mathematical relation between the included angle of the sensor coordinate system and the x axis of the workpiece coordinate system and the measured value;
and according to the measured values of the sensor inclined around the x and y axes of the workpiece coordinate system, the mathematical relation between the included angles between the sensor coordinate system and the y and x axes of the workpiece coordinate system and the measured values.
The installation error of measuring the sensor among cuboid standard component size in to measurement system is rectified, includes:
obtaining the coordinate value of each vertex of the standard component to compare with a theoretical value, and calculating the installation inclination angle of the sensor according to the installation error model of the sensor;
and adjusting the installation of the sensor according to the inclination angle value of the installation of the sensor, and correcting the measured data value.
Measure trapezoidal steel wire, obtain cross-section profile dimension data, include:
and (4) performing piecewise fitting on the measured data, extracting point coordinates related to the size, and calculating a size value.
A device for measuring the geometric dimension of a trapezoidal steel wire used for realizing the method comprises: the fixture supports the front flat plate and the fixture supports the rear flat plate, and the trapezoidal steel wire penetrates through the fixture supports the front flat plate and the fixture supports the rear flat plate; the laser plane of the line laser sensors is installed in a coplanar mode and is respectively used for obtaining profile data of the section of the trapezoidal steel wire, and the section profiles are spliced through calibration parameters, so that the complete section profile of the trapezoidal steel wire is obtained.
Four line laser sensors are symmetrically distributed around the trapezoidal steel wire.
The invention can use the workpiece coordinate system parallel to the section of the trapezoidal steel wire to correct the measuring coordinate system of the four sensors, therefore, the laser planes of the sensors are not absolutely coplanar, and only approximate alignment is needed, thereby greatly reducing the installation requirement. Meanwhile, the mathematical relation between the included angle between the sensor coordinate system and the workpiece coordinate system and the measured value is given, and even if the laser plane is not vertical to the longitudinal direction of the trapezoidal steel wire after the sensor is installed, the measurement result is guaranteed to be the cross section profile data of the trapezoidal steel wire instead of the oblique section profile data through data correction. In addition, the four sensor profile data are transformed to the same reference coordinate system, and a profile splicing step is omitted. In conclusion, the invention can improve the accuracy and efficiency of the geometric dimension measurement of the trapezoidal steel wire.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. In the drawings:
FIG. 1 is a schematic structural diagram of a device for measuring the geometric dimension of a trapezoidal steel wire according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of a 4 sensor laser plane coplanar mounting in an example of the invention;
FIG. 3 is a schematic illustration of the laser plane coplanar mounting profile measurements of FIG. 2;
FIG. 4 is a schematic diagram of a situation in which 4 sensors are tilted according to an embodiment of the present invention;
FIG. 5 is a schematic representation of profile measurements for one instance of the sensor of FIG. 4 being tilted;
FIG. 6 is a schematic flow chart of a method for measuring the geometric dimension of a trapezoidal steel wire according to an embodiment of the present invention;
FIG. 7 is a flow chart of the sensor tilt calibration of the trapezoidal wire geometry measurement system in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
The embodiment of the invention provides an online measuring method and device for the geometric dimension of a trapezoidal steel wire, which are used for solving the problems of large measuring error, less measuring data, workpiece damage, production continuity and the like existing in the conventional manual vernier caliper measuring method, realizing the digital online detection of the trapezoidal steel wire and being explained by the embodiment.
The line structure light profile measuring technology is based on the triangulation principle, can obtain the profile information of a measured object in real time, and has the characteristics of high speed, high precision and non-contact. Fig. 1 is a structural diagram of a trapezoidal steel wire geometric dimension measuring device, the measuring device comprises a clamp support front flat plate 1 and a clamp support rear flat plate 2, and a trapezoidal steel wire 3 penetrates through the clamp support front flat plate 1 and the clamp support rear flat plate 2. Four line laser sensors 4 are symmetrically distributed around the trapezoidal steel wire 3, laser planes of the four line laser sensors 4 are installed in a coplanar mode and are respectively used for obtaining trapezoidal steel wire section outline data, and the section outlines are spliced through calibration parameters, so that the complete section outline of the trapezoidal steel wire is obtained. In addition, the line laser sensor 4 may be fixed to the frame by a sensor fixing plate 5 during installation.
Aiming at the line laser trapezoidal steel wire geometric dimension measurement, the inventor finds a technical problem:
in the on-line laser measuring system for the geometric dimension of the trapezoidal steel wire, the coplanarity degree of the laser planes of the sensors is an important factor influencing the measurement precision of the geometric dimension of the trapezoidal steel wire. In order to make the laser planes coplanar and ensure the accuracy of the geometric dimension measurement result of the trapezoidal steel wire, the four line laser sensors 41,42,43,44 should be mounted coplanar as shown in fig. 2 and 3, which puts high demands on the sensor fixture processing and mounting process, however, due to the limitations of fixture processing precision and mounting environment, it is difficult to ensure that the 4 laser planes are precisely coplanar. When the laser is not coplanar, the measurement result is not a cross section perpendicular to the trapezoidal steel wire, but a certain distortion is generated, so that the measurement error is caused. Fig. 4 and 5 show a case where the laser planes of the 4 lasers are not coplanar, wherein the laser planes of the first sensor 41, the third sensor 43 and the fourth sensor 44 are perpendicular to the longitudinal direction of the trapezoidal steel wire, but the laser plane of the second sensor 42 is not parallel to the cross section of the trapezoidal steel wire and is not coplanar with the rest laser planes, and then the first sensor 41, the third sensor 43 and the fourth sensor 44 obtain the cross section profile data perpendicular to the longitudinal direction of the trapezoidal steel wire, and the second sensor 42 obtains the profile data not perpendicular to the longitudinal direction of the trapezoidal steel wire, which is called as oblique section profile data. Obviously, compared with the cross section profile, the oblique section profile of the trapezoidal steel wire is stretched in a certain direction, the stretching direction is related to the included angle between the laser plane and the longitudinal direction of the trapezoidal steel wire, the stretching causes the deformation of the measuring profile of the trapezoidal steel wire, the deformed profile causes the deviation of the positioning of the characteristic points of the profile of the trapezoidal steel wire, and finally the measuring error of the trapezoidal steel wire is increased. More generally, when none of the 4 laser planes is perpendicular to the longitudinal direction of the trapezoidal steel wire, the measurement profile of the trapezoidal steel wire is not the cross section profile of the trapezoidal steel wire, and the measurement results are distorted, which may cause larger errors.
As the inventors have discovered the above problems, a trapezoidal wire geometry measurement scheme has been proposed that corrects for laser plane non-coplanarity due to sensor tilt: firstly, conversion parameters among sensor coordinate systems are obtained by utilizing a traditional calibration method of a multi-line laser sensor measurement system, and measurement data are unified to a certain sensor coordinate system to obtain a complete section profile. Then establishing a workpiece coordinate system parallel to the section of the trapezoidal steel wire, taking the middle point of the bottom edge as an original point and the bottom edge as an X axis; then, according to the position relation between the sensor and the workpiece, the sensor coordinate system is translated and rotated to be aligned with the workpiece coordinate system, theoretically, the two coordinate systems are overlapped, but the sensor is inclined, namely the laser plane is not vertical to the longitudinal direction of the workpiece, and an included angle is formed between the two coordinate systems; and projecting the profile data of the trapezoidal steel wire onto a plane of a workpiece coordinate system according to the mathematical relationship among the standard value, the measured value and the included angle to obtain the profile data of the cross section of the trapezoidal steel wire, thereby realizing the correction of the installation error of the multiple laser sensors. The method can correct the measuring coordinate systems of 4 sensors by utilizing the workpiece coordinate system parallel to the section of the trapezoidal steel wire, so that the laser planes of the sensors are not absolutely coplanar, and only approximate alignment is needed, thereby greatly reducing the installation requirement. Meanwhile, the mathematical relation between the included angle between the sensor coordinate system and the workpiece coordinate system and the measured value is given, and even if the laser plane is not vertical to the longitudinal direction of the trapezoidal steel wire after the sensor is installed, the measurement result is guaranteed to be the cross section profile data of the trapezoidal steel wire instead of the oblique section profile data through data correction. In addition, the four sensor profile data are transformed to the same reference coordinate system, and a profile splicing step is omitted. The trapezoidal wire geometry measurement scheme is described in detail below.
Fig. 6 is a schematic flow chart of a method for measuring the geometric dimension of the trapezoidal steel wire in the embodiment of the invention, and the method comprises the following steps:
(1) acquiring conversion parameters between sensor coordinate systems, and calibrating the sensors;
(2) determining conversion parameters between a workpiece coordinate system and a sensor coordinate system according to the position relation between a sensor and a workpiece in a measuring system, and unifying the sensor and the workpiece coordinate;
(3) establishing a sensor installation error model according to the measurement condition of the inclination of the sensor around each axis of the workpiece coordinate system;
(4) the measuring standard component corrects the installation error of the sensor in the measuring system;
(5) and measuring the trapezoidal steel wire to obtain the data of the profile dimension of the section.
The embodiment of the invention provides a geometric dimension measuring method for a trapezoidal steel wire, which corrects the profile measurement result of each sensor to a plane (an XOY plane of a workpiece coordinate system) vertical to the longitudinal direction of the trapezoidal steel wire and reduces the measurement error caused by non-coplanarity of laser. The method does not need to greatly reduce the clamp machining precision requirement and the field installation environment requirement.
In one embodiment, sensor calibration may include:
acquiring coordinates of two points in a common measurement area of a sensor; the two points are as far apart as possible;
substituting the two point coordinate values measured by each sensor into a coordinate conversion formula
Xsp、YspIs a coordinate of a sensor lower point, Xtp、YtpThe coordinates of the point in the target sensor coordinate system. The coordinate conversion parameter X between the coordinate systems of the two sensors can be determined by two pointsto、YtoTheta, uniformly converting the coordinatesAnd switching to the target sensor coordinate system.
In one embodiment, determining a conversion parameter between a coordinate system of the workpiece and a coordinate system of the sensor according to a position relationship between the sensor and the workpiece in the measurement system, and unifying the coordinates of the sensor and the workpiece may include:
establishing a workpiece coordinate system parallel to the section of the trapezoidal steel wire, and taking the middle point of the bottom edge as an original point and the bottom edge as an X axis;
through the position relation between the sensor and the workpiece, the sensor coordinate system is aligned with the workpiece coordinate system in a translation and rotation mode, theoretically, the two coordinate systems are overlapped, but the sensor is inclined, namely the laser plane is not perpendicular to the longitudinal direction of the workpiece, and an included angle is formed between the two coordinate systems.
In one embodiment, modeling sensor mounting errors based on measurements of sensor tilt about various axes of the workpiece coordinate system comprises:
according to the mathematical relation between the included angle alpha of the sensor coordinate system and the y-axis of the workpiece coordinate system and the measured value, the measured value of the sensor is inclined around the x-axis of the workpiece coordinate system:
according to the measured value of the inclination of the sensor around the y axis of the workpiece coordinate system, the mathematical relation between the included angle beta of the sensor coordinate system and the x axis of the workpiece coordinate system and the measured value is as follows:
x1＝x0/cosβ
y1＝y0
according to the measured values of the sensor inclined around the x axis and the y axis of the workpiece coordinate system, the included angles alpha and beta between the sensor coordinate system and the y axis and the x axis of the workpiece coordinate system and the measured values are in a mathematical relation formula:
in one embodiment, the measurement standard corrects for installation errors of sensors in a measurement system, comprising:
selecting a cuboid standard part with the size close to that of the workpiece, establishing a coordinate system by taking the middle point of the bottom edge as an original point and taking the vertical direction to the bottom edge as a y axis, and obtaining theoretical values of four vertexes;
and measuring coordinate values of four vertexes of the cuboid, substituting the coordinate values into the error model, and calculating the inclination angle of each sensor.
In one embodiment, measuring the trapezoidal wire to obtain cross-sectional profile dimension data comprises:
the measured data are fitted in a segmented mode to obtain the size and the circle center position of each circular arc of the trapezoidal steel wire;
the coordinates of the points related to the size are extracted, and the size value is calculated.
The geometric dimension measuring scheme of the trapezoidal steel wire provided by the embodiment of the invention has the advantages that: the direction vector of the trapezoidal steel wire in the world coordinate system is obtained by calibrating the trapezoidal steel wire in the longitudinal direction, a virtual plane vertical to the trapezoidal steel wire in the longitudinal direction is established according to the vector, and the profile measurement data of the half sections of the left and right trapezoidal steel wires are projected onto the virtual plane to realize the laser plane alignment correction of the trapezoidal steel wire geometric dimension measurement system.
In the embodiment of the invention, compared with the technical scheme of measuring the geometric dimension of the trapezoidal steel wire with low precision and efficiency in the prior art, the scheme for measuring the geometric dimension of the trapezoidal steel wire comprises the following steps: and acquiring conversion parameters among sensor coordinate systems, and unifying the measurement data to a certain sensor coordinate system to obtain a complete section profile. The sensor coordinate system is aligned with the workpiece coordinate system in a translation and rotation mode through the position relation between the sensor and the workpiece, theoretically, the two coordinate systems are overlapped, but the sensor is inclined, namely the laser plane is not vertical to the longitudinal direction of the workpiece, and an included angle is formed between the two coordinate systems; according to the mathematical relationship among the standard value, the measured value and the included angle, the profile data of the trapezoidal steel wire is projected onto the plane of the workpiece coordinate system, and then the profile data of the cross section of the trapezoidal steel wire can be obtained, so that the installation error correction of the multiple laser sensors is realized. The method can correct the measuring coordinate systems of 4 sensors by utilizing the workpiece coordinate system parallel to the section of the trapezoidal steel wire, so that the laser planes of the sensors are not absolutely coplanar, and only approximate alignment is needed, thereby greatly reducing the installation requirement. Meanwhile, the mathematical relation between the included angle between the sensor coordinate system and the workpiece coordinate system and the measured value is given, and even if the laser plane is not vertical to the longitudinal direction of the trapezoidal steel wire after the sensor is installed, the measurement result is guaranteed to be the cross section profile data of the trapezoidal steel wire instead of the oblique section profile data through data correction. The invention can improve the accuracy and efficiency of the geometric dimension measurement of the trapezoidal steel wire.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A method for measuring the geometric dimension of a trapezoidal steel wire is characterized by comprising the following steps:
acquiring conversion parameters between sensor coordinate systems, and calibrating the sensors;
determining conversion parameters between a workpiece coordinate system and a sensor coordinate system according to the position relation between a sensor and a workpiece in a measuring system, and unifying the sensor and the workpiece coordinate;
establishing a sensor installation error model according to the measurement condition of the inclination of the sensor around each axis of the workpiece coordinate system;
the measuring standard component corrects the installation error of the sensor in the measuring system;
and measuring the trapezoidal steel wire to obtain the data of the profile dimension of the section.
2. A method for measuring the geometric dimension of a trapezoidal wire as in claim 1, wherein the conversion parameters between the sensor coordinate systems are determined, and the calibration of the sensor comprises:
acquiring coordinates of two points in a common measurement area of a sensor; the two points are as far apart as possible;
and determining coordinate conversion parameters between sensor coordinate systems according to the two point coordinate values measured in each sensor, and converting the coordinates into a certain sensor coordinate system uniformly.
3. A method for measuring the geometric dimension of a trapezoidal wire as defined in claim 1, wherein the step of determining the conversion parameter between the coordinate system of the workpiece and the coordinate system of the sensor based on the positional relationship between the sensor and the workpiece comprises:
establishing a virtual plane vertical to the longitudinal direction of the trapezoidal steel wire according to the direction parameters of the trapezoidal steel wire in the longitudinal direction under a world coordinate system; establishing a workpiece coordinate system by taking the middle point of the bottom edge of the trapezoidal steel wire as an original point and the bottom edge as an X axis;
determining direction parameters of a sensor coordinate system and a workpiece coordinate system according to the position relation between the sensor and the trapezoidal steel wire; determining the coordinate value of the origin of the workpiece coordinate system under the sensor coordinate system;
and determining conversion parameters between the workpiece coordinate system and the sensor coordinate system according to the information, and unifying the sensor coordinate system and the workpiece coordinate system.
4. A method for measuring the geometric dimension of a trapezoidal wire as defined in claim 1, wherein the step of modeling the installation error of the sensor based on the measurement of the inclination of the sensor about each axis of the workpiece coordinate system comprises:
according to the measured value of the sensor inclined around the x axis of the workpiece coordinate system, the mathematical relation between the included angle of the sensor coordinate system and the y axis of the workpiece coordinate system and the measured value;
according to the measured value of the sensor inclined around the y axis of the workpiece coordinate system, the mathematical relation between the included angle of the sensor coordinate system and the x axis of the workpiece coordinate system and the measured value;
and according to the measured values of the sensor inclined around the x and y axes of the workpiece coordinate system, the mathematical relation between the included angles between the sensor coordinate system and the y and x axes of the workpiece coordinate system and the measured values.
5. A method for measuring the geometric dimension of a trapezoidal steel wire according to claim 1, wherein the step of measuring the dimension of the rectangular parallelepiped standard member to correct the installation error of the sensor in the measuring system comprises the steps of:
obtaining the coordinate value of each vertex of the standard component to compare with a theoretical value, and calculating the installation inclination angle of the sensor according to the installation error model of the sensor;
and adjusting the installation of the sensor according to the inclination angle value of the installation of the sensor, and correcting the measured data value.
6. A method for measuring the geometric dimension of a trapezoidal steel wire according to claim 1, wherein the step of measuring the trapezoidal steel wire to obtain the data of the cross-sectional profile dimension comprises the steps of:
and (4) performing piecewise fitting on the measured data, extracting point coordinates related to the size, and calculating a size value.
7. A trapezoidal wire geometry measuring device for implementing the method of any one of claims 1 to 6, comprising: the fixture supports the front flat plate (1) and the rear flat plate (2), and the trapezoidal steel wire (3) penetrates through the fixture supports the front flat plate (1) and the fixture supports the rear flat plate (2); a plurality of line laser sensors (4) are symmetrically distributed around the trapezoidal steel wire (3), the laser planes of the line laser sensors (4) are installed in a coplanar mode and are respectively used for acquiring the profile data of the section of the trapezoidal steel wire, and the section profiles are spliced by calibration parameters, so that the complete section profile of the trapezoidal steel wire is obtained.
8. The trapezoidal wire geometry measuring device of claim 7, wherein: four line laser sensors (4) are symmetrically distributed around the trapezoidal steel wire (3).
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