Product surface curvature radius detection device

Abstract

The utility model discloses a product surface curvature radius detection device, and relates to the field of curvature radius detection. The product surface curvature radius detection device comprises a to-be-detected product, a detection light source, a detection camera, a calibration block and a control system. The detection light source is used for emitting parallel dot matrix light to a to-be-detected product; the parallel dot matrix light rays enter a detection camera after being reflected by the to-be-detected product, so that the detection camera obtains a product dot matrix light spot diagram; the calibration block and a to-be-detected product are placed on the same plane, and the parallel dot matrix light is reflected by the calibration block and then enters the detection camera, so that the detection camera obtains a system dot matrix light spot diagram; the control system is electrically connected with the detection light source and the detection camera. The control system quickly calculates the surface height of the product and fits the surface curvature radius of the product by processing the product dot-matrix light spot diagram and the system dot-matrix light spot diagram, so that the detection time is saved, the detection efficiency and precision are improved, and the detection cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of curvature radius detection, in particular to a device for detecting the curvature radius of a product surface. Background Art

[0002] Curvature radius testing has a wide range of applications in industrial production, spanning multiple fields, aiming to improve product quality, optimize manufacturing processes, and ensure product safety and reliability. In the automotive industry, curvature radius testing is used in the design and manufacture of vehicle bodies and components. In the machining industry, curvature radius testing is used in the manufacture of cutting tools and molds to ensure their accuracy and service life, thereby improving processing quality. In precision parts processing, curvature radius testing ensures the accuracy of part size and shape, meeting the demands of high-precision manufacturing.

[0003] In the existing technology, surface radius detection is generally a single-point test. The detection process requires gradually moving the product to be tested to obtain detection data, which is time-consuming, low in detection efficiency and low in detection accuracy. Utility Model Content

[0004] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide a device for detecting the curvature radius of a product surface, which can realize high-speed detection of the curvature radius of a product surface.

[0005] The present invention provides a device for detecting the surface curvature radius of a product, comprising: a product to be tested, a detection light source, a detection camera, a calibration block, and a control system. The detection light source is configured to emit parallel dot-matrix light rays toward the product to be tested; the parallel dot-matrix light rays are reflected by the product to be tested and then enter the detection camera, allowing the detection camera to obtain a dot-matrix light pattern of the product; the calibration block and the product to be tested are placed on the same plane; the parallel dot-matrix light rays are reflected by the calibration block and then enter the detection camera, allowing the detection camera to obtain a dot-matrix light pattern of the system; and the control system is electrically connected to the detection light source and the detection camera, respectively.

[0006] According to some embodiments of the present invention, the detection camera is located in an area above the product to be tested, and an optical axis of the detection camera forms an angle of 45 degrees with the calibration block or the plane where the product to be tested is located.

[0007] According to some embodiments of the present invention, the product surface curvature radius detection device further includes a first electric adjustment device, which is used to adjust the position of the detection light source; and the control system is electrically connected to the first electric adjustment device.

[0008] According to some embodiments of the present invention, the product surface curvature radius detection device also includes a second electric adjustment device, which is used to adjust the position of the detection camera; the control system is electrically connected to the second electric adjustment device.

[0009] According to some embodiments of the present invention, the product surface curvature radius detection device also includes a third electric adjustment device, which is used to adjust the positions of the product to be tested and the calibration block; the control system is electrically connected to the third electric adjustment device.

[0010] According to some embodiments of the present invention, the third electric adjustment device is further provided with a product carrier, and the product carrier is used to carry the product to be tested and the calibration block.

[0011] According to some embodiments of the present invention, the calibration block is a plane mirror.

[0012] According to some embodiments of the present invention, the detection light source includes a Gaussian light source or an LED light source.

[0013] According to some embodiments of the present invention, the detection light source can emit dot matrix parallel light rays of multiple different colors.

[0014] The device for detecting the curvature radius of a product surface according to the embodiment of the present invention has at least the following beneficial effects:

[0015] The detection light source emits a dot matrix parallel light beam to the calibration block, and the calibration block reflects the dot matrix parallel light to the detection camera to form a system dot matrix light spot pattern. The detection light source emits a dot matrix parallel light beam to the product to be tested, and the product to be tested reflects the dot matrix parallel light to the detection camera to form a product dot matrix light spot pattern. The control system calculates the height difference of the product surface by processing the position information of the system dot matrix light spot pattern and the product dot matrix light spot pattern, thereby fitting the product surface curvature radius and realizing high-speed detection of the product surface curvature radius.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 This is a structural diagram of a device for detecting the curvature radius of a product surface according to an embodiment of the present utility model;

[0019] Reference numerals:

[0020] Detection light source 100 , detection camera 200 , first electric adjustment device 301 , second electric adjustment device 302 , third electric adjustment device 303 , product to be tested 400 , calibration block 500 , control system 600 . DETAILED DESCRIPTION

[0021] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0023] In the description of this utility model, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0024] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0025] Reference Figure 1The present invention proposes a device for detecting the surface curvature radius of a product, comprising a detection light source 100, a detection camera 200, a product to be tested 400, a calibration block 500, and a control system 600. The detection light source 100 is used to emit parallel dot matrix light rays toward the product to be tested 400; the parallel dot matrix light rays are reflected by the product to be tested 400 and then enter the detection camera 200, so that the detection camera 200 obtains a product dot matrix light spot diagram; the calibration block 500 and the product to be tested 400 are placed on the same plane, and the parallel dot matrix light rays are reflected by the calibration block 500 and then enter the detection camera 200 to obtain a system dot matrix light spot diagram; the control system 600 adjusts the detection light source 100 according to the centroid position of the center of the system dot matrix light spot diagram reflected by the calibration block; the control system 600 is electrically connected to the detection light source 100 and the detection camera 200, respectively. It should be noted that the test camera 200 may be a CCD (charge coupled device) camera or a CMOS (complementary metal oxide semiconductor) camera, and the detection light source 100 may change the number of parallel dot matrix light according to the measurement accuracy requirements.

[0026] In this embodiment, parallel dot matrix light is reflected by the calibration block 500 to the detection camera 200 to form a system dot matrix light spot pattern. The control system 600 adjusts the light source 100 according to the centroid position of the center of the system dot matrix light spot pattern, so that the light reflected by the calibration block 500 is coaxial with the optical axis of the detection camera 200, saving equipment debugging time.

[0027] In this embodiment, before placing the product to be tested, the calibration block is used as a reference, and the parallel dot matrix light is reflected through the calibration block to the detection camera 200 to form a system dot matrix light spot pattern. The detection camera 200 feeds the system dot matrix light spot pattern back to the control system 600. The image collection and processing system of the control system 600 processes the input system dot matrix light spot pattern information to obtain the coordinate position of each light spot in the system dot matrix light spot pattern.

[0028] In this embodiment, parallel dot matrix light is reflected by the product to be tested 400 to the detection camera 200 to form a product dot matrix light spot pattern. The detection camera 200 feeds the product dot matrix light spot pattern back to the control system 600. The image collection and processing system of the control system 600 processes the input light spot centroid image information to obtain the coordinate position of each light spot in the product dot matrix light spot pattern, and then calculates the surface height of each point of the product to be tested 400 by combining the coordinate position of each light spot in the system dot matrix light spot pattern. The least squares method is then used to fit the spherical radius, that is, the curvature radius, according to the surface height of each point.

[0029] The surface height is calculated as follows:

[0030] Δx=x 1 -x 0 ;

[0031] Δy=y1 -y 0 ;

[0032]

[0033] Among them, x 1 is the x coordinate of each spot in the product dot matrix spot diagram, x 0 is the x coordinate of each spot in the system's dot matrix spot diagram, y 1 is the y coordinate of each spot in the product dot matrix spot diagram, y 0 is the y-coordinate of each spot in the system's dot-matrix light pattern, θ is the angle of incidence, Δx is the distance the spot moves in the x-axis direction after the product 400 is placed, Δy is the distance the spot moves in the y-axis direction after the product 400 is placed, and ΔZ is the surface height of the product 400. One spot corresponds to a point on the surface of the product 400. It should be understood that the surface height here refers to the height from the surface of the calibration block 500. For example, if the surface height of the calibration block 500 is 0 and the thickness is h, then the surface height of the product carrier is -h.

[0034] Furthermore, in some embodiments of the present invention, the inspection camera 200 is located above the product 400 to be inspected, and the optical axis of the inspection camera 200 forms a 45-degree angle with the calibration block 500 or the plane on which the product 400 to be inspected is located. The inspection camera 200 is secured by other mechanical means. It is understood that the optical axis of the inspection camera 200 and the plane on which the calibration block 500 or the product 400 to be inspected may also form an angle of other degrees to facilitate imaging by the inspection camera 200.

[0035] Furthermore, in some embodiments of the present invention, the product surface curvature radius detection device further includes a first electric adjustment device 301, which is used to adjust the position of the detection light source 100; and a control system 600 is electrically connected to the first electric adjustment device 301. The control system 600 controls the first electric adjustment device 301 to adjust the first light source 100 so that the parallel dot matrix light emitted by the first light source 100 is reflected by the product to be tested 400 and then reflected onto the detection camera 200, forming a suitable and clear product dot matrix light spot pattern.

[0036] Furthermore, in some embodiments of the present invention, the product surface curvature radius detection device further includes a second electric adjustment device 302, which is used to adjust the position of the detection camera 200; and the control system 600 is electrically connected to the second electric adjustment device 302. The control system 600 controls the second electric adjustment device 302 to adjust the detection camera 200, so that the detection camera 200 moves within the depth of field to obtain different test positions. When the detection camera 200 is adjusted to each different test position, the control system 600 adjusts the position of the calibration block 500 to perform system calibration, thereby improving the detection accuracy of the product surface curvature radius.

[0037] Furthermore, in some embodiments of the present invention, the product surface curvature radius detection device further includes a third electric adjustment device 303, which is used to adjust the position of the product under test 400 or the calibration block 500. The control system 600 is electrically connected to the third electric adjustment device 303. The control system 600 controls the third electric adjustment device 303 to move the product under test 400 and the calibration block 500 so that the light reflected by them is coaxial with the optical axis of the detection camera 200, thereby improving the detection accuracy of the product surface curvature radius.

[0038] Furthermore, in some embodiments of the present invention, the third electric adjustment device 303 is further provided with a product carrier for carrying the product under test 400 and the calibration block 500. The product carrier secures the position of the product under test 400 or the calibration block 500 to prevent shaking or displacement of the product under test 400 or the calibration block 500 during testing or system calibration, thereby reducing errors in test results.

[0039] It should be noted that the first electric adjustment device 301 , the second electric adjustment device 302 , and the third electric adjustment device 303 may adopt a structure capable of adjusting position, such as a multi-axis adjustment robot arm or a screw transmission device.

[0040] Furthermore, in some embodiments of the present invention, the calibration block 500 is a plane mirror. The light reflected by the plane mirror forms a clearer dot pattern on the inspection camera 200, facilitating the control system 600 to calculate the center of mass of the dot pattern based on the dot pattern, thereby maintaining a relatively stable state of the entire device and reducing the detection error of the product surface curvature radius. However, it should be understood that the calibration block can also be other components that can reflect light to form a clear spot pattern on the inspection camera 200.

[0041] Furthermore, in some embodiments of the present invention, the detection light source 100 includes a Gaussian light source or an LED light source, preferably a Gaussian light source. The Gaussian light source has a relatively small divergence angle, forms a smaller light spot, and the light emitted by it can maintain good directionality during transmission.

[0042] Furthermore, in some embodiments of the present invention, the detection light source 100 can emit a plurality of dot matrix parallel light rays of different colors, thereby increasing the wavelength detection range and being compatible with products of different colors.

[0043] Furthermore, in some embodiments of the present invention, after the calibration block 500 is placed, the device can perform self-inspection regularly, and the control system 600 performs system calibration by regularly lighting the detection light source 100, and automatically adjusts the detection camera 200 in the device, thereby ensuring the stability and accuracy of the test, and reducing the time for the next system calibration, thereby improving detection efficiency.

[0044] According to the product surface curvature radius detection device of the present invention, the detection light source 100 emits parallel dot matrix light rays to the product to be tested 400, and the product to be tested 400 reflects the dot matrix parallel light rays to the detection camera 200 to form a product dot matrix light spot pattern. The control system 600 calculates the surface height of the product to be tested 400 by processing the position information of the dot matrix light spot, thereby fitting the surface curvature radius of the product to be tested 400, thereby realizing high-speed detection of the product surface curvature radius.

[0045] Throughout this specification, references to terms such as "one embodiment," "further embodiments," "some specific embodiments," or "some examples" indicate that the specific features, structures, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0046] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A device for detecting the curvature radius of a product surface, characterized in that: include: The product to be tested; A detection light source, configured to emit parallel dot matrix light toward the product to be tested; A detection camera, wherein the parallel dot matrix light is reflected by the product to be tested and then enters the detection camera, so that the detection camera obtains a dot matrix light spot diagram of the product; A calibration block, wherein the calibration block and the product to be tested are placed on the same plane, and the parallel lattice light is reflected by the calibration block and enters the detection camera to obtain a system lattice light pattern; A control system is electrically connected to the detection light source and the detection camera respectively.

2. The device for detecting the curvature radius of a product surface according to claim 1, wherein: The detection camera is located in an area above the product to be tested, and an optical axis of the detection camera forms an angle of 45 degrees with the plane where the calibration block or the product to be tested is located.

3. The device for detecting the curvature radius of a product surface according to claim 1, wherein: The product surface curvature radius detection device further includes a first electric adjustment device, which is used to adjust the position of the detection light source; the control system is electrically connected to the first electric adjustment device.

4. The device for detecting the curvature radius of a product surface according to claim 1, wherein: The product surface curvature radius detection device also includes a second electric adjustment device, which is used to adjust the position of the detection camera; the control system is electrically connected to the second electric adjustment device.

5. The device for detecting the curvature radius of a product surface according to claim 1, wherein: The product surface curvature radius detection device further includes a third electric adjustment device, which is used to adjust the positions of the product to be tested and the calibration block; the control system is electrically connected to the third electric adjustment device.

6. The device for detecting the curvature radius of a product surface according to claim 5, characterized in that: The third electric adjustment device is further provided with a product carrier, and the product carrier is used to carry the product to be tested and the calibration block.

7. The device for detecting the curvature radius of a product surface according to claim 1, wherein: The calibration block is a plane mirror.

8. The device for detecting the product surface curvature radius according to claim 1, wherein: The detection light source includes a Gaussian light source or an LED light source.

9. The device for detecting the curvature radius of a product surface according to claim 1, wherein: The detection light source can emit a plurality of dot matrix parallel light rays of different colors.

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