CN117232436A - Composite material tow angle binocular detection device, use method and parameter selection method - Google Patents
Composite material tow angle binocular detection device, use method and parameter selection method Download PDFInfo
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- 238000010187 selection method Methods 0.000 title abstract description 8
- 238000003384 imaging method Methods 0.000 claims abstract description 80
- 238000005259 measurement Methods 0.000 claims description 39
- 239000000463 material Substances 0.000 claims description 13
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a composite material strand angle binocular detection device, a using method and a parameter selection method, which are applied to the technical field of composite material sheet detection, wherein the device comprises a laser line aligner, a rotary support assembly, a swing arm, a binocular camera and a lighting device, the rotary support assembly comprises a bracket and a rotary encoder, the laser line aligner is provided with a collinear slit and a photosensitive element, the laser line aligner aligns laser lines through the collinear slit and confirms and adjusts the positions in place through the induction of the photosensitive element, and the swing angle and the positions between the laser line aligner and the binocular camera are adjusted through the swing arm, so that the accurate positions of reference lines of the binocular camera and the strand directions are displayed through imaging; the method for selecting the parameters is convenient to operate, reduces the difficulty in identifying the tows of the composite material sheets, can quickly identify the directions of the tows, can realize clear imaging and angle detection of the tows of the composite material sheets, improves the precision of detection results, and provides accurate data for a composite material laying process.
Description
Technical Field
The invention relates to the technical field of composite material sheet detection, in particular to a composite material tow angle binocular detection device, a using method and a parameter selection method.
Background
In the composite forming process, the tow angle of each layer of material sheet has a great influence on the final strength of the composite, and in order to counteract the anisotropy of the composite, the composite is generally required to be sequentially laid in the directions of 0 degrees, 45 degrees, 90 degrees and-45 degrees in the laying process.
In the process of laying the composite material sheet, the material sheet is obtained by cutting by a blanking machine, and then the material sheet is manually laid by aiming at a laser line projection mark, so that a certain error exists. The composite material sheet is composed of fiber tows and resin materials, the reflectivity of the fiber tows is low, the reflectivity of the resin materials is high, the resin materials form random distributed irregular spots on the surfaces of the tows, the tows are covered, the tows are difficult to observe, the general imaging mode is influenced by the low reflectivity of the fibers and the resin spots, and the tows are difficult to identify.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a composite material tow angle binocular detection device, a using method and a parameter selection method, which can reduce the tow identification difficulty of composite material sheets, quickly identify the tow direction, have high identification precision, can realize clear imaging and angle detection of the composite material sheet tows, and provide accurate data for a composite material laying process.
In order to achieve the above object, the present invention provides the following technical solutions:
the utility model provides a compound material silk bundle angle binocular detection device, it includes laser line aligner, rotating support assembly, swing arm and binocular camera, the both sides of the outer end of laser line aligner are equipped with collineation slit and photosensitive element respectively, the collineation slit runs through the top and bottom two sides of laser line aligner, the axis of two collineation slits is on same straight line, the partial or whole collineation slit below of locating of photosensitive element, the inner fixed connection of laser line aligner is to rotating support assembly, the outer end of swing arm is connected with rotating support assembly, the inner and the binocular camera fixed connection of swing arm, the swing arm is rotatable relatively with laser line aligner, adjust the angle and the position between swing arm and the laser line aligner through above-mentioned rotation.
The alignment laser line is formed through the collinear slit of the laser line aligner, the position of the laser line aligner is determined by taking the collinear slit as a reference, the laser line is accurately sensed through the photosensitive element of the laser line aligner, the accuracy of the position of the laser line aligner is improved, a converted intermediate connection structure is provided for the laser line aligner and the swing arm through the rotary support assembly, the laser line aligner and the swing arm can be conveniently rotated relatively, the rotary support assembly can conveniently place the device on a composite sheet and adjust the position, the operation is convenient, the tow direction of the composite sheet can be clearly imaged through the binocular camera, the relative angle and the position can be adjusted through the binocular camera and the laser line aligner, the accurate position of the reference line and the tow direction of the binocular camera is displayed through imaging, the tow direction can be rapidly measured, the clear imaging and angle detection of the composite sheet tow can be realized, the tow recognition difficulty is reduced, and accurate data is provided for the composite laying process.
In a preferred embodiment of the present invention, the above-mentioned rotary support assembly includes a bracket including a bracket body and a support column, the support column being fixed to a bottom of the bracket body, the bracket body being fixed to an inner end of the laser line aligner; the support body is convenient for provide rotary encoder's installation basis, and the support body is fixed with the laser line aligner simultaneously, ensures that the position, the angular relationship of laser line aligner and binocular camera only adjusts through rotary encoder, ensures the precision, simultaneously through the support column, and the device can conveniently adjust position and fixed position on the complex material piece.
In a preferred embodiment of the present invention, the above-mentioned rotary support assembly further includes a rotary encoder, the body of the rotary encoder is fixed to the bracket main body of the bracket, the vertical rotation shaft of the rotary encoder is connected to the outer end of the swing arm, and the relative rotation angle between the swing arm and the laser line aligner is adjusted by the rotary encoder; the relative angle between the swing arm and the laser line aligner is adjusted through the rotary encoder, so that the angle adjusting precision is improved, and the angle is conveniently read.
In a preferred embodiment of the present invention, the composite material tow angle binocular detection device further includes an illumination device, the binocular camera is provided with a lens, the illumination device is connected to the lens, and the lens faces downward vertically; the illumination device is used for providing illumination for the lens working area of the binocular camera, so that a light source outside the device is omitted, and the position of the light source is conveniently adjusted to the optimal position, so that the detection effect is ensured.
In a preferred embodiment of the present invention, the lighting device includes two light sources located on the same side of the lens, each light source corresponds to one lens, an acute angle θ is formed between a light ray center line emitted by the light source and a main optical axis of the corresponding lens, and the range of θ is 45°±5°; through the setting of angle, can show the refraction light that weakens the composite material piece, carry out the light filling to binocular camera for the imaging effect of composite material piece silk bundle reaches the best.
The application method of the composite material tow angle binocular detection device comprises the following steps of:
a1, placing a composite material strand angle binocular detection device on a composite material sheet to be detected, and adjusting the placement position of a rotary supporting component to align a collinear slit of a laser line aligner with a laser line, wherein two photosensitive elements can be irradiated by laser through corresponding collinear slits;
a2, rotating the swing arm to enable the axis of the swing arm to be perpendicular to the central axis of the collinear slit, wherein the horizontal connecting line of the two lenses of the binocular camera is parallel to the laser line, and then setting the reading of the rotary encoder to 0;
a3, adjusting the focal length of the lens to enable the composite material sheet to be capable of clearly imaging in an imaging unit of the binocular camera;
a4, slowly rotating the swing arm, simultaneously observing imaging of the composite material sheet in the binocular camera, displaying a reference line parallel to the connecting line direction of two lenses of the binocular camera in an imaging picture, and displaying the rotation angle of the swing arm read from the rotary encoder on the reference line;
a5, observing bright and clear tow imaging, wherein the tows are basically parallel in imaging, stopping rotating the swing arm when the tows are parallel to a reference line of an imaging picture, and displaying an angle in the imaging picture at the moment, namely, an included angle between the direction of the tows of the composite material sheet and the direction of the laser line.
The device is adjusted to the initial state of detection through A1, alignment of the device and a laser line is achieved, the rotary encoder can be zeroed through A2, detection angles are convenient, readings are convenient, tow imaging of a composite material sheet is obtained through A3, reference is provided through A4, the relation between the actual tow direction and a reference line is displayed, the tow direction is visually compared with the reference line through A5, and the included angle between the tow direction and the laser line direction is obtained.
The parameter selection method of the composite material tow angle binocular detection device adopts the composite material tow angle binocular detection device and comprises the following steps:
s1, setting a width A and a spacing H of a collinear slit according to a measurement precision requirement and a laser line width, and ensuring that an alignment error of a laser line aligner is less than or equal to 1/10 of the measurement precision requirement alpha;
s2, selecting the specification of the rotary encoder according to the measurement precision requirement, wherein the pulse number M of one circle of rotation of the rotary encoder of the specification meets the following conditions: the corresponding rotation angle of each pulse is 360/M less than or equal to alpha/10;
s3, setting the target surface size L, the number N of pixels and the lens magnification G of an imaging unit of the binocular camera according to the tow diameter D of the composite material sheet, wherein the number N of pixels is the smaller number of pixels in one row or one column of pixels in an imaging picture; the setting ensures that each tow of the composite material sheet occupies the width of not less than 10 pixels in an imaging picture, and each imaging unit corresponds to not less than 50 tows visible in the imaging picture;
s4, determining the actual size of an imaging area according to the parameters selected in the step S3, and setting the base line length B of the binocular camera according to the actual size of the imaging area and the measurement accuracy requirement alpha, so that the alignment error of a reference line and a composite material sheet tow is less than or equal to 1/10 of the measurement accuracy requirement alpha;
s5, checking whether the parameters obtained in the steps meet the requirements or not through the following formulas:
arctan(S/H)+360/M+arctan(15B/L)≤α/3
if yes, each parameter determined in the steps S1 to S4 is a required parameter; if not, the parameters are redetermined until the requirements of the above formula are met.
The slit width and the distance are determined according to the measurement precision requirement through S1 and serve as initial measurement parameters, good measurement conditions are provided for detection, a rotary encoder is determined according to the measurement precision requirement through S2, so that good precision is obtained, accurate measurement is facilitated, parameters of a binocular camera are adjusted through S3, the parameters of the binocular camera are set to be optimal according to the result feedback of an imaging picture, the base line length is determined according to the measurement precision requirement and an imaging area through S4, the measurement precision is improved, and the specific parameters of composite material sheet tow detection can be determined through checking calculation of a simple formula provided by S5.
In a preferred embodiment of the present invention, in the step S1, the laser line width is S, the slit width a is (2±0.5) S, and the pitch H satisfies: h is greater than or equal to S/tan (alpha/10); by setting the spacing, the device is set to an optimal measurement state.
In a preferred embodiment of the present invention, each parameter in the step S3 satisfies: L/G is more than or equal to 30D, and the number N of pixels is more than or equal to 500; the parameters of the binocular camera are adjusted to be optimal through the setting of the parameters.
In the preferred embodiment of the present invention, in the step S4, the reference line occupies 2 times the pixel width as the tow occupies the pixel width, the actual size of the imaging area is L/G, and the baseline length B is equal to or greater than L/15Gtan (alpha/10); through adjusting the parameters of the imaging picture, the imaging and measuring effects can be converted into setting of logarithmic values, and the index is quantized, so that the measuring precision is further improved.
Compared with the prior art, the invention has the beneficial effects that:
1. the device forms the reference of aligning the laser line through the collineation slit of laser line aligner to the position of laser line aligner is confirmed to collineation slit as the benchmark, the accuracy of laser line aligner position is responded to through the photosensitive element of laser line aligner, improve the accuracy of laser line aligner position, provide the intermediate linkage who changes for laser line aligner and swing arm through rotatory supporting component, be convenient for laser line aligner and swing arm carry out relative rotation, rotatory supporting component can conveniently place the device on the cladding material piece and the adjustment position simultaneously, be convenient for operate, can carry out clear imaging to the tow direction of cladding material piece through the binocular camera, through being connected with the swing arm, binocular camera can adjust relative angle and position with the laser line aligner, thereby demonstrate the accurate position of the tow discernment degree of binocular camera and tow direction through the formation of image, can reduce the tow direction of composite material piece, and discernment is high in recognition accuracy, can realize the clear formation of images and angle detection to cladding material piece tow, provide accurate data for cladding material laying technology.
2. The use method comprises the steps of adjusting the device to an initial detection state through A1, realizing alignment of the device and a laser line, enabling a rotary encoder to be zeroed through A2, facilitating detection of angles and reading, obtaining tow imaging of a composite material sheet through A3, providing reference through A4, displaying the relation between the actual tow direction and a reference line, visually comparing the tow direction with the reference line through A5, and obtaining the included angle between the tow direction and the laser line direction; the method is suitable for a double-eye detection device for the angle of the composite material tows, is convenient to operate, reduces the difficulty in identifying the tows of the composite material sheets, and can quickly identify the directions of the tows.
3. According to the parameter selection method, the slit width and the distance are determined according to the measurement precision requirement through S1, a better measurement condition is provided for detection as an initial measurement parameter, a rotary encoder is determined according to the measurement precision requirement through S2, so that better precision is obtained, accurate measurement is facilitated, the parameters of a binocular camera are adjusted through S3, the parameters of the binocular camera are set to be optimal according to the result feedback of an imaging picture, the base line length is determined according to the measurement precision requirement and an imaging area through S4, the measurement precision is improved, and the specific parameter of the composite material sheet tow detection can be determined through checking calculation of a simple formula provided through S5; the method standardizes parameter setting, sets and processes each parameter quantitatively, improves the accuracy of detection results, and is convenient for the subsequent composite material laying process after the parameters are determined.
Drawings
FIG. 1 is a schematic diagram of a composite tow angle binocular detection apparatus of the present invention;
FIG. 2 is a schematic diagram of a laser line aligner of the present invention;
FIG. 3 is a top view of the laser line aligner of the present invention;
FIG. 4 is a schematic diagram of a binocular camera of the present invention;
FIG. 5 is a schematic view of a lighting device of the present invention;
FIG. 6 is a step diagram of a method of use of the present invention;
FIG. 7 is a step diagram of a parameter selection method according to the present invention;
FIG. 8 is a diagram showing an image of a binocular camera in the swing arm rotation of the present invention;
FIG. 9 is a diagram showing an image of a binocular camera at the final position of the swing arm of the present invention;
the marks in the figure: 1-a laser line aligner; 101-collinear slits; 102-a photosensitive element; 2-a bracket; 201-a stent body; 202-supporting columns; 3-a rotary encoder; 4-swinging arms; 5-binocular camera; 501-an imaging unit; 502-lens; 6-lighting device.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should not be construed that the scope of the above subject matter of the present invention is limited to the following embodiments, and all techniques realized based on the present invention are within the scope of the present invention.
Example 1
Referring to fig. 1, the embodiment provides a dual-view detection device for detecting a composite material wire bundle angle, which is used in the detection of a composite material sheet, and is arranged on the surface of the composite material sheet to detect the wire bundle, the device comprises a laser line aligner 1, a rotary support assembly, a swing arm 4, a binocular camera 5 and a lighting device 6, the rotary support assembly comprises a bracket 2 and a rotary encoder 3, the laser line aligner 1 is provided with a collinear slit 101 and a photosensitive element 102, the laser line aligner 1 aligns with a laser line through the collinear slit 101, and is adjusted in place through the induction of the photosensitive element 102, the device is arranged on the surface of the composite material sheet through the rotary support assembly, the rotation angle of the swing arm 4 and the laser line aligner 1 is adjusted through the rotation action of the rotary support assembly, the relative angle and position of the composite material sheet can be adjusted through the binocular camera 5 connected with the swing arm 4, the relative angle and position can be adjusted through the binocular camera 5, the accurate position of the reference line and the wire bundle direction of the binocular camera 5 can be displayed through imaging, the accurate wire bundle direction can be measured, the accurate laying and the composite material wire bundle angle can be accurately identified, and the process data can be accurately laid.
Referring to fig. 2 and 3, in the present embodiment, the laser line aligner 1 has a T-shaped structure, including an integrally formed lateral body portion and a vertical body portion, the lateral body portion is an outer end of the laser line aligner 1, wherein one end of the vertical body portion is connected to a middle edge of the lateral body portion, the other end of the vertical body portion is fixedly connected to a bracket main body 201 of the rotary supporting assembly, and the end of the vertical body portion for connecting the bracket main body 201 is an inner end of the laser line aligner 1; the two ends of the transverse body part are respectively provided with a colinear slit 101 concavely towards the middle direction, the colinear slit 101 penetrates through the top and bottom surfaces of the transverse body part of the laser line aligner 1, the central axes of the two colinear slits 101 are on the same straight line, namely, in the laser line direction, the laser line can pass through the two colinear slits 101 at the same time, the colinear slit 101 of the laser line aligner 1 forms a reference for aligning the laser line, the position of the laser line aligner 1 is determined by taking the colinear slit 101 as a reference, the bottom of the transverse body part of the laser line aligner 1 is provided with a photosensitive element 102, the photosensitive element 102 is fixed by a screw, part or all of the photosensitive element 102 is arranged below the colinear slit 101, the photosensitive element 102 can sense after the laser line irradiated from the right upper side passes through the colinear slit 101, the photosensitive element 102 accurately senses the laser line through the photosensitive element 102 of the laser line aligner 1, and the position accuracy of the laser line aligner 1 is improved.
In this embodiment, the support 2 includes a support main body 201 and a support column 202, where the support main body 201 is in a circular ring structure, a main body portion of the support column 202 is in a rod shape, and a bottom portion of the support column 202 is in a sphere structure, the support column 202 may be set in other shapes, and made of a material that is not easy to wear, such as a metal rod with a polished bottom, so that the bottom portion of the support column 202 is not easy to wear on a surface of a composite material sheet, and may also be made of a soft material including rubber, silica gel, etc.; the support column 202 is fixed at the bottom of the support main body 201, and can be integrally formed, welded, connected by screws or other connection modes, the outer side of the support main body 201 is fixed with the inner end of the laser line aligner 1, and the support main body 201 is adopted to provide a mounting foundation of the rotary encoder 3 conveniently; the body of the rotary encoder 3 is fixed with the support main body 201 of the support 2 in a screw connection mode, three support columns 202 are positioned on the outer side of the rotary encoder 3, the vertical rotating shaft of the rotary encoder 3 faces upwards, the top end of the vertical rotating shaft of the rotary encoder 3 is connected to the outer end of the swing arm 4, the rotary encoder 3 is fixed in a screw connection mode, and other connection modes can be adopted, because the laser line aligner 1 and the rotary encoder 3 are in a relatively fixed relation, the angle adjustment and measurement precision are improved only through the rotary encoder 3, the angle can be conveniently read, the relative rotation angle between the swing arm 4 and the laser line aligner 1 can be adjusted and read through the rotary encoder 3, so that the angle and the position between the binocular camera 5 and the laser line aligner 1 can be adjusted, the rotary encoder 3 is electrically connected to an external display, and the angle reading of the rotary encoder 3 can be displayed in an imaging picture of the display, and the electric connection and display technology is the prior art; the rotary encoder 3 of the rotary support assembly provides a converted intermediate connection structure for the laser line aligner 1 and the swing arm 4, so that the laser line aligner 1 and the swing arm 4 can rotate relatively, and meanwhile, the support 2 of the rotary support assembly can conveniently place the device on a composite sheet and adjust the position, so that the operation is facilitated.
Referring to fig. 4, in the present embodiment, a binocular camera 5 is connected with a swing arm 4, the swing arm 4 has a rod-shaped structure, the outer end of the swing arm 4 is connected with a vertical rotating shaft of a rotary encoder 3 of a rotary supporting assembly, the inner end of the swing arm 4 is fixedly connected with the side surface of a main body of the binocular camera 5, other connection modes can be adopted, the swing arm 4 and the laser line aligner 1 can rotate relatively, and the angle and the position between the binocular camera 5 and the laser line aligner 1 can be adjusted by the rotation of the swing arm 4; the binocular camera 5 is provided with an imaging unit 501 and a lens 502, the lens 502 adopts a long barrel lens 502, the imaging unit 501 is an imaging element provided with an imaging photosensitive sensor, the imaging unit 501 is electrically connected to an external display, the display is used for displaying an imaging picture of the imaging unit 501, a reference line is marked in the imaging picture, the imaging unit 501 is positioned at the top of the lens 502 and at the bottom of the binocular camera 5 main body, the lens 502 is vertically arranged, and the shooting direction of the lens 502 is vertically downward; the main body of the binocular camera 5 is in a strip shape, the strip-shaped arrangement direction of the binocular camera 5 is parallel to the horizontal connecting line direction of the two lenses 502, the horizontal connecting line of the two lenses 502 means that the midpoints of the two lenses 502 are positioned in the same horizontal direction, the connecting line of the midpoints of the two lenses 502 is the horizontal connecting line, and the arrangement direction of the main body of the binocular camera 5 is parallel to the horizontal connecting line; in this embodiment, the centers of the two imaging units 501 are used as the origin of coordinates, and an O-XYZ rectangular coordinate system and an O ' -X ' Y ' Z ' rectangular coordinate system are respectively established, wherein the X axis/X ' axis is the horizontal connecting direction of the two lenses 502, the direction is parallel to the laser line direction, the Y axis/Y ' axis direction is the direction perpendicular to the X axis and toward the light source, and the Z axis/Z ' axis is the vertical downward direction of the corresponding lens 502.
Referring to fig. 5, in the present embodiment, the lighting device 6 is connected to the lenses 502, the lighting device 6 is an existing lighting device with light sources, each lens 502 is connected to one lighting device 6, one end of the lighting device 6 is sleeved outside the lens 502, the other end of the lighting device 6 is provided with the light sources, the two light sources are located at the same side of the whole area formed by the two lenses 502, the light sources incline downwards, each light source corresponds to one lens 502, an acute angle θ is formed between the center line of the light rays emitted by the light source and the main optical axis of the corresponding lens 502, and the range of θ is 45 ° ± 5 °, in the present embodiment, the angle is 45 °; the illumination device 6 is used for providing illumination for the working area of the lens 502 of the binocular camera 5, so that a light source outside the device is omitted, the position of the light source is conveniently adjusted to the optimal position, the detection effect is ensured, the refractive light of the composite material sheet can be obviously weakened through the arrangement of the angle, the binocular camera 5 is subjected to light supplementing, and the imaging effect of the composite material sheet tow is optimal.
Example 2
Referring to fig. 6, the present embodiment provides a method for using the composite tow angle binocular detection device of embodiment 1, the method includes the following steps:
a1, placing the composite material strand angle binocular detection device on a composite material sheet to be detected, adjusting the placement position of a rotary supporting component to align the collinear slits 101 of the laser line aligner 1 with a laser line, and adjusting the device to a detected initial state through A1 by the two photosensitive elements 102 through the corresponding collinear slits 101 to align the device with the laser line.
A2, rotate swing arm 4, make the axis of swing arm 4 perpendicular with collinear slit 101 axis, the horizontal line of two camera lenses 502 of binocular camera 5 is parallel with the laser line this moment, put 0 with rotary encoder 3's reading again, can return to zero rotary encoder 3 through A2, the angle of being convenient for detects, convenient reading.
A3, adjusting the focal length of the lens 502 to enable the composite material sheet to be imaged clearly in the imaging unit 501 of the binocular camera 5, and acquiring tow imaging of the composite material sheet through the A3.
A4, slowly rotating the swing arm 4, simultaneously observing imaging of the composite material sheet in the binocular camera 5, displaying a reference line parallel to the connecting line direction of the two lenses 502 of the binocular camera 5 in an imaging picture, displaying the rotation angle of the swing arm 4 read from the rotary encoder 3 on the reference line, providing reference through the A4, and displaying the relation between the actual tow direction and the reference line.
A5, observing bright and clear tow imaging, wherein the tows are basically parallel in the imaging, stopping rotating the swing arm 4 when the tows are parallel to a reference line of an imaging picture, and at the moment, displaying an angle in the imaging picture, namely an included angle between the tow direction of the composite material sheet and the laser line direction, and visually comparing the tow direction with the reference line through A5 to obtain the included angle between the tow direction and the laser line direction.
Example 3
Referring to fig. 7, the present embodiment provides a method for selecting parameters of a composite tow angle binocular detection device, which adopts the composite tow angle binocular detection device in embodiment 1, the method for using the device adopts the method in embodiment 2, and the parameter selection includes the following steps:
s1, setting the width A and the spacing H of the collinear slit 101 according to the measurement precision requirement and the laser line width, ensuring that the alignment error of the laser line aligner 1 is less than or equal to 1/10 of the measurement precision requirement alpha, determining the slit width and the spacing according to the measurement precision requirement through S1, and providing a better measurement condition for detection by taking the slit width and the spacing as initial measurement parameters.
Wherein the laser line width is S, the slit width a is (2±0.5) S, wherein the pitch H satisfies: h is greater than or equal to S/tan (alpha/10); by setting the spacing, the device is set to an optimal measurement state.
S2, selecting the specification of the rotary encoder 3 according to the measurement precision requirement, wherein the number M of pulses of one circle of rotation of the rotary encoder 3 of the specification meets the following requirements: the rotation angle 360/M of each pulse is less than or equal to alpha/10, and the rotary encoder 3 is determined according to the measurement precision requirement through S2, so that better precision is obtained, and accurate measurement is facilitated.
S3, setting the target surface size L of an imaging unit 501 of the binocular camera 5, the number N of pixels and the magnification G of a lens 502 according to the tow diameter D of the composite material sheet, wherein the number N of pixels is the smaller number of pixels in one row or one column of pixels in an imaging picture; the setting enables each tow of the composite material sheet to occupy the width of not less than 10 pixels in an imaging picture, each imaging unit 501 is corresponding to not less than 50 tows visible in the imaging picture, the parameters of the binocular camera 5 are adjusted through S3, and the parameters of the binocular camera 5 are set to be optimal according to the feedback of the result of the imaging picture. The parameters in this step satisfy: L/G is more than or equal to 30D, and the number N of pixels is more than or equal to 500; the parameters of the binocular camera 5 are adjusted to be optimal by setting the respective parameters.
S4, determining the actual size of an imaging area according to the parameters selected in the step S3, setting the base line length B of the binocular camera 5 according to the actual size of the imaging area and the measurement precision requirement alpha, enabling the alignment error of a reference line and a composite material sheet tow to be less than or equal to 1/10 of the measurement precision requirement alpha, determining the base line length according to the measurement precision requirement and the imaging area through the step S4, and improving the measurement precision. The reference line occupying pixel width in the imaging picture is 2 times of the tow occupying pixel width, the actual size of the imaging area is L/G, and the base line length B is more than or equal to L/15Gtan (alpha/10); through adjusting the parameters of the imaging picture, the imaging and measuring effects can be converted into setting of logarithmic values, and the index is quantized, so that the measuring precision is further improved.
S5, checking whether the parameters obtained in the steps meet the requirements or not through the following formulas:
arctan(S/H)+360/M+arctan(15B/L)≤α/3
if yes, each parameter determined in the steps S1 to S4 is a required parameter; if not, the parameters are determined again until the requirements of the above formula are met, and the specific parameters of the composite material sheet tow detection can be determined by providing checking calculation of a simple formula through S5.
Referring to fig. 8 and 9, the method of this embodiment is used to detect the direction of the tow of a composite sheet, where in fig. 8, the tow direction has an angle with the reference line direction, and the swing arm 4 is rotating, and in fig. 9, the tow direction is parallel to the reference line direction, and in this case, in a final state of stopping rotation, the angle between the tow direction of the composite sheet and the reference line direction is detected to be 5.12 °.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. The utility model provides a compound material silk bundle angle binocular detection device, its characterized in that includes laser line alignment ware (1), rotatory supporting component, swing arm (4) and binocular camera (5), the both sides of the outer end of laser line alignment ware (1) are equipped with colinear slit (101) and photosensitive element (102) respectively, colinear slit (101) run through the top and bottom two sides of laser line alignment ware (1), two the axis of colinear slit (101) is on same straight line, the part or the whole of photosensitive element (102) are located collinear slit (101) below, the inner fixedly connected with of laser line alignment ware (1) rotatory supporting component, the outer end of swing arm (4) with rotatory supporting component is connected, the inner of swing arm (4) with binocular camera (5) fixed connection, swing arm (4) with the relative rotatable of laser line alignment ware (1) adjusts through above-mentioned rotation angle and the position between swing arm (4) and the laser line alignment ware (1).
2. The composite tow angle binocular detection device according to claim 1, wherein the rotary support assembly comprises a support (2), the support (2) comprises a support body (201) and a support column (202), the support column (202) is fixed at the bottom of the support body (201), and the support body (201) is fixed with the inner end of the laser line aligner (1).
3. The composite tow angle binocular detection device according to claim 2, wherein the rotary support assembly further comprises a rotary encoder (3), a body of the rotary encoder (3) is fixed with a bracket body of the bracket, a vertical rotating shaft of the rotary encoder (3) is connected to an outer end of the swing arm (4), and a relative rotation angle between the swing arm (4) and the laser line aligner (1) is adjusted by the rotary encoder (3).
4. The composite tow angle binocular detection device according to claim 1, further comprising an illumination device (6), the binocular camera (5) being provided with a lens (502), the illumination device (6) being connected to the lens (502), the lens (502) facing vertically downwards.
5. The device according to claim 4, wherein the illumination device (6) comprises two light sources located on the same side of the lens (502), each of the light sources corresponds to one of the lenses (502), and a light ray center line emitted by the light source has an acute angle θ with a main optical axis corresponding to the lens, and θ ranges from 45 ° ± 5 °.
6. A method for using a composite tow angle binocular detection device according to any one of claims 1 to 5, comprising the steps of:
a1, placing a composite material strand angle binocular detection device on a composite material sheet to be detected, and adjusting the placement position of the rotary support assembly to align the collinear slits (101) of the laser line aligner (1) with a laser line, wherein the two photosensitive elements (102) can be irradiated by laser through the corresponding collinear slits (101);
a2, rotating the swing arm (4) to enable the axis of the swing arm (4) to be perpendicular to the central axis of the collinear slit (101), wherein at the moment, the horizontal connecting line of the two lenses (502) of the binocular camera (5) is parallel to a laser line, and then setting the reading of the rotary encoder (3) to 0;
a3, adjusting the focal length of the lens (502) to enable the composite material sheet to be clearly imaged in an imaging unit (501) of the binocular camera (5);
a4, slowly rotating the swing arm (4) and simultaneously observing an image of the composite material sheet in the binocular camera (5);
a5, observing bright and clear tow imaging, wherein the tows are basically parallel in the imaging, stopping rotating the swing arm (4) when the tows to be detected are parallel to a reference line of an imaging picture, and displaying an angle in the imaging picture at the moment, namely, an included angle between the direction of the tows of the composite material sheet and the direction of the laser line.
7. A method for selecting parameters of a composite tow angle binocular detection device, characterized in that the composite tow angle binocular detection device according to any one of claims 1-5 is adopted, comprising the following steps:
s1, setting the width A and the spacing H of the collinear slit (101) according to the measurement precision requirement and the laser line width, and ensuring that the alignment error of the laser line aligner (1) is less than or equal to 1/10 of the measurement precision requirement alpha;
s2, selecting the specification of the rotary encoder (3) according to the measurement precision requirement, wherein the pulse number M of one circle of rotation of the rotary encoder (3) of the specification meets the following conditions: the corresponding rotation angle of each pulse is 360/M less than or equal to alpha/10;
s3, setting the target surface size L, the pixel number N and the lens magnification G of an imaging unit (1) of the binocular camera (5) according to the tow diameter D of the composite material sheet, wherein the pixel number N is the smaller pixel number in the pixel number of one row or one column in an imaging picture; the setting ensures that each tow of the composite material sheet occupies the width of not less than 10 pixels in an imaging picture, and each imaging unit (1) is corresponding to not less than 50 tows visible in the imaging picture;
s4, determining the actual size of an imaging area according to the parameters selected in the step S3, and setting the base line length B of the binocular camera (5) according to the actual size of the imaging area and the measurement accuracy requirement alpha, so that the alignment error of a reference line and a composite material sheet tow is less than or equal to 1/10 of the measurement accuracy requirement alpha;
s5, checking whether the parameters obtained in the steps meet the requirements or not through the following formulas:
arctan(S/H)+360/M+arctan(15B/L)≤α/3
if yes, each parameter determined in the steps S1 to S4 is a required parameter; if not, the parameters are redetermined until the requirements of the above formula are met.
8. The method for selecting parameters of a composite tow angle binocular detection device according to claim 7, wherein in the step S1, the laser line width is S, the slit width a is (2±0.5) S, and the pitch H satisfies: H.gtoreq.S/tan (. Alpha./10).
9. The method for selecting parameters of a composite tow angle binocular detection apparatus according to claim 7, wherein each parameter in the step S3 satisfies: L/G is more than or equal to 30D, and the number N of pixels is more than or equal to 500.
10. The method according to claim 7, wherein in the step S4, the reference line occupies 2 times the pixel width of the tow, the actual size of the imaging area is L/G, and the baseline length B is equal to or greater than L/15Gtan (α/10).
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