Cam vibration mark defect detection device for engine camshaft
By using a clamping mechanism and a linear laser light source to reflect black and white stripe images, the problem of low accuracy in camshaft vibration defect detection is solved, achieving efficient and accurate camshaft inspection, reducing defective products and labor costs.
Patent Information
- Application Number
- CN202422091077.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-27
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-08-27
AI Technical Summary
In the existing technology, the detection of camshaft vibration defects relies on manual visual inspection, which is easily affected by external factors, resulting in low detection accuracy and difficulty in detecting small-sized cam vibration marks, increasing the risk of defective products being released.
A clamping mechanism is used to fix the camshaft, and a linear laser light source is used to reflect the image onto a projection board to form a black and white stripe image. The image is captured by an industrial camera and the controller judges the vibration defects of the cam, replacing manual inspection and improving the accuracy and efficiency of inspection.
It enables accurate detection of camshaft vibration defects, reduces the influence of external factors, improves detection accuracy, prevents defective products from leaving the market, and saves labor costs.
Smart Images
Figure CN223500888U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of engine manufacturing technology, and in particular to a cam vibration mark defect detection device for engine camshafts. Background Technology
[0002] The camshaft is an important component in an engine. Its function is to control the opening and closing of the valves by contacting the valve rocker arms via the cam. The cam bears periodic impact loads, and the contact stress between the cam and the valve rocker arms is very high, as is the relative sliding speed. Therefore, the cam needs to have high dimensional accuracy, low surface roughness, and high wear resistance.
[0003] The machining process for camshafts is: rough grinding → quenching → semi-finish grinding → finish grinding. Finish grinding is the most crucial step in the entire process. Using a high-precision CNC grinding machine and CBN grinding wheels, the camshaft is ground at high speed to achieve its final shape and precision. Due to the high precision required, vibration imbalance in the grinding machine can lead to 0.1μm-level vibration marks on the camshaft. When these marks contact the valve rocker arm, they cause abnormal noise and wear in the engine, significantly shortening the camshaft's lifespan. However, because these vibration marks are small, they are difficult for operators to detect during final product inspection, posing a significant risk of defective products being released. Currently, the detection of vibration mark defects on engine camshafts relies on visual inspection by operators, who judge the size of the defects based on their experience. This method is easily affected by various external factors such as lighting and operator condition, resulting in a long inspection time and an inability to accurately determine whether a defect is abnormal. Utility Model Content
[0004] The purpose of this invention is to provide a cam vibration mark defect detection device for engine camshafts, which can accurately detect cam vibration mark defects, replace manual inspection, prevent the influence of external factors, improve the accuracy of inspection, prevent defective products from being released, and save labor costs and improve inspection efficiency.
[0005] To achieve the above objectives, this utility model provides a camshaft cam groove defect detection device, comprising:
[0006] A fixed platform, on which a camshaft is fixed;
[0007] A clamping mechanism for fixing the camshaft and driving the camshaft to rotate;
[0008] A light source mechanism, wherein the light source mechanism is disposed toward the clamping mechanism;
[0009] A projection plate is disposed on one side of the clamping mechanism, and the light emitted by the light source mechanism is reflected onto the projection plate after reaching the clamping mechanism;
[0010] A camera mechanism, which faces the projection panel to record the image projected by the projection panel;
[0011] A controller electrically connected to the imaging mechanism to process images captured by the imaging mechanism.
[0012] Compared with existing technologies, the cam vibration mark defect detection device for engine camshafts of this utility model has the following advantages: A projection plate is provided on one side of the clamping mechanism, and a light source mechanism is provided on the other side of the clamping mechanism so that the light emitted by the light source can be projected onto the projection plate after being reflected by the camshaft. The imaging mechanism is positioned directly opposite the projection plate to record the image on the projection plate. During the detection process, the camshaft to be detected is fixed on the clamping mechanism. The light source mechanism emits light to the cam on the camshaft. After the light reaches the cam, it is reflected onto the projection plate, which displays an image with black and white stripes. The imaging mechanism records this image with black and white stripes and transmits it to the controller for judgment of vibration mark processing defects. If there are obvious alternating black and white stripes in the image, the controller judges that the cam has a vibration mark processing defect. If there are no obvious alternating black and white stripes in the image, the cam is judged to be a qualified product. Through the cam vibration mark defect detection device for engine camshafts of this application, the vibration mark defects of the cam can be accurately detected, replacing manual inspection, preventing the influence of external factors, improving the accuracy of inspection, preventing defective products from flowing out, saving labor costs, and improving inspection efficiency.
[0013] The camshaft vibration defect detection device of the present invention includes a clamping mechanism comprising a first clamping part and a second clamping part, wherein the first clamping part and the second clamping part are respectively disposed on both sides of the camshaft to clamp the camshaft.
[0014] The camshaft vibration defect detection device of the present invention includes a camshaft connected to a rotating motor, which drives the camshaft to rotate at a constant speed.
[0015] The camshaft vibration defect detection device of the engine camshaft according to the present invention includes a first fixing position and a second fixing position on the fixing platform. The first fixing position and the second fixing position are respectively used to fix camshafts of different sizes. The camshafts fixed at the first fixing position and the second fixing position are clamped by the cylinder group.
[0016] The camshaft vibration defect detection device of the present invention includes a first clamping cylinder and a second clamping cylinder on the first clamping part, and a third clamping cylinder on the second clamping part. The first clamping cylinder drives the first clamping part to clamp the camshaft located at the first fixed position, the first clamping cylinder and the second clamping cylinder drive the first clamping part to clamp the camshaft located at the second fixed position, and the third clamping cylinder drives the second clamping part to clamp the camshaft located at the first fixed position and the second fixed position.
[0017] The cam vibration mark defect detection device for engine camshaft according to this utility model embodiment includes a linear laser light source, which is aligned with the cam fixed by the clamping mechanism.
[0018] The cam vibration mark defect detection device for engine camshaft according to this utility model embodiment includes an industrial camera as the imaging mechanism, and the lens of the industrial camera is aimed at the projection plate.
[0019] The cam vibration mark defect detection device for engine camshaft according to this utility model embodiment has a projection plate arranged perpendicular to the horizontal plane.
[0020] The cam vibration mark defect detection device for engine camshaft according to this utility model embodiment, wherein the light from the light source mechanism is projected onto the waist of the cam during the detection process.
[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the clamping mechanism of the engine camshaft cam groove defect detection device according to an embodiment of the present invention.
[0023] Figure 2 This is a schematic diagram of the overall structure of the cam vibration mark defect detection device for engine camshaft according to an embodiment of the present invention;
[0024] Figure 3 This is a schematic diagram of the illumination angle of the cam vibration mark defect detection device for the engine camshaft according to an embodiment of the present invention;
[0025] In the figure, 1 is the clamping mechanism; 11 is the rotating shaft; 12 is the first clamping part; 121 is the first clamping cylinder; 122 is the second clamping cylinder; 13 is the second clamping part; 131 is the third clamping cylinder; 14 is the rotating motor; 2 is the light source mechanism; 3 is the projection board; 4 is the shooting mechanism; 5 is the cam; 6 is the fixed platform; 61 is the first fixed position; 62 is the second fixed position; 63 is the camshaft. Detailed Implementation
[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0027] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0028] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.
[0029] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.
[0030] like Figure 1 and Figure 2As shown, a preferred embodiment of the present invention discloses a camshaft cam groove defect detection device, comprising a fixed platform 6, on which cams 5 are fixed, and further comprising a clamping mechanism 1, a light source mechanism 2, a projection plate 3, an imaging mechanism 4, and a controller. The clamping mechanism 1 is used to fix a camshaft 63, which has multiple cams 5, with the outer surfaces of the cams 5 exposed for inspection. The light source mechanism 2 is located above and facing the clamping mechanism 1, and the light emitted by the light source mechanism 2 can directly hit the cams 5 on the clamping mechanism 1. The projection plate 3 is located on one side of the clamping mechanism 1 in the horizontal direction, and the light emitted by the light source mechanism 2 is reflected onto the projection plate 3 after reaching the clamping mechanism 1. The imaging mechanism 4 is located diagonally above the clamping mechanism 1 in the horizontal direction, on the other side of the clamping mechanism 1 away from the projection screen, to prevent interference with the light path of the light source mechanism 2 and the projection screen. The imaging mechanism 4 faces the projection plate 3 to record the image projected by the projection plate 3. The controller is electrically connected to the imaging mechanism 4 to process the image captured by the imaging mechanism 4.
[0031] During the inspection process, the camshaft 63 to be inspected is fixed on the clamping mechanism 1. The light source mechanism 2 emits light onto the cam 5, and the light is reflected onto the projection plate 3 after reaching the cam 5. An image with black and white stripes is displayed on the projection plate 3. The imaging mechanism 4 records this image with black and white stripes and transmits it to the controller for judgment of vibration pattern processing defects. If the image has obvious alternating black and white stripes, the controller judges that the cam 5 has a vibration pattern processing defect. If the image does not have obvious alternating black and white stripes, the cam 5 is judged to be a qualified product. The vibration pattern defect detection device for the engine camshaft 5 of this application can accurately detect the vibration pattern defect of the cam 5, replacing manual inspection, preventing the influence of external factors, improving the accuracy of inspection, preventing defective products from flowing out, saving labor costs, and improving inspection efficiency.
[0032] In some embodiments of this utility model, the clamping mechanism 1 includes a first clamping part 12 and a second clamping part 13. The first clamping part 12 and the second clamping part 13 are respectively disposed on both sides of the camshaft 63. The first clamping part 12 and the second clamping part 13 work together to apply pressure to the camshaft 63 between them, thereby fixing the camshaft 63 between the first clamping part 12 and the second clamping part 13. The arrangement of the first clamping part 12 and the second clamping part 13 ensures that the camshaft 63 is securely fixed, guaranteeing the stable clamping of the camshaft 63 in this device. Furthermore, both the first clamping part 12 and the second clamping part 13 are provided with a rotatable rotating shaft 11 for abutting against the camshaft 63.
[0033] In some embodiments of this utility model, the rotary motor 14 is mounted on the first clamping part 12. When the camshaft 63 is clamped by the first clamping part 12, the rotary motor 14 is connected to the rotary motor 14. The rotary motor 14 drives the camshaft 63 to rotate at a constant speed. During the rotation process, lighting and photography are performed to detect the cam from all angles, ensuring the overall detection of the cam, improving the automation level of the device, and making the rotation process of the camshaft 63 precise and adjustable, which is conducive to the stable rotation of the cam 5 to the position to be detected.
[0034] In some embodiments of this utility model, the fixed platform 6 is provided with a first fixing position 61 and a second fixing position 62. The first fixing position 61 and the second fixing position 62 are respectively used to fix camshafts 63 of different sizes. The setting of multiple fixing positions enables this device to be used to detect camshafts 63 of different sizes, improving the flexibility of this device. The camshafts 63 fixed to the first fixing position 61 and the second fixing position 62 are clamped by a cylinder assembly. Specifically, the first fixing position 61 is used to fix a longer camshaft 63, and the second fixing position 62 is used to fix a shorter camshaft 63.
[0035] In some embodiments of this utility model, a first clamping cylinder 121 and a second clamping cylinder 122 are provided on the first clamping part 12, and a third clamping cylinder 131 is provided on the second clamping part 13. Since the camshaft 63 on the first fixed position 61 is relatively long, the first clamping cylinder 121 is used to drive the first clamping part 12 to clamp the camshaft 63 located on the first fixed position 61. The camshaft 63 on the second fixed position 62 is relatively short, and the first clamping cylinder 121 and the second clamping cylinder 122 need to jointly drive the first clamping part 12 to clamp the camshaft 63 located on the second fixed position 62. The third clamping cylinder 131 drives the second clamping part 13 to clamp the camshaft 63 located on the first fixed position 61 and the second fixed position 62. By using multiple clamping cylinders, the flexibility of the device is improved, enabling the device to clamp various camshafts 63 of different specifications and to detect camshafts 63 of different specifications, reducing the detection cost of changing detection equipment.
[0036] like Figure 3 As shown, in some embodiments of this utility model, a plurality of cams 5 are provided on the camshaft 63, and the plurality of cams 5 are evenly spaced on the camshaft 63. The width of the projection screen matches the length of the camshaft 63, so that the cam 5 vibration defect detection device of this application can simultaneously detect multiple cams 5. The light source mechanism 2 illuminates all cams 5, and the imaging mechanism 4 transmits all images back to the controller for judgment. This setting greatly improves the detection efficiency of this application. Specifically, each light source mechanism 2 corresponds to two cams 5.
[0037] like Figure 3As shown, in some embodiments of this utility model, the light source mechanism 2 includes a linear laser light source. The linear laser light source is aligned with the cam 5 fixed by the clamping mechanism 1, and the laser is used to "magnify" the vibration anomaly and project it onto the projection plate 3. The laser light source provides stable illumination and clear light, and it is easy to adjust the illumination range and intensity. Specifically, the linear laser light source uses a blue light source.
[0038] In some embodiments of this utility model, the imaging mechanism 4 includes an industrial camera that converts light signals into ordered electrical signals. The lens of the industrial camera is aimed at the projection panel 3, which can accurately record the image and quickly transmit it to the controller, so that the controller can quickly detect the image on the projector and determine whether the cam 5 is qualified.
[0039] In some embodiments of this utility model, the projection plate 3 is set perpendicular to the horizontal plane. The vertically set projection plate 3 is conducive to the light source mechanism 2 and the shooting mechanism 4 adjusting their own angles according to the position of the projection plate 3, which is equivalent to directly setting the coordinate axis of the entire system.
[0040] In some embodiments of this utility model, the light from the light source mechanism 2 is projected onto the waist of the cam 5 during the detection process. The waist of the cam 5 is generally a plane, which is beneficial for the light source to illuminate a large surface area of the cam 5 and output a stable and intuitive projected image.
[0041] In some embodiments of this utility model, the controller includes a PLC or a microcontroller, which can quickly and accurately judge the projected image signal and also save costs.
[0042] The working process of this utility model is as follows: A projection plate 3 is provided on one side of the clamping mechanism 1, and a light source mechanism 2 is provided on the other side of the clamping mechanism 1 so that the light emitted by the light source can be projected onto the projection plate 3 after being reflected by the cam 5. The imaging mechanism 4 is positioned directly opposite the projection plate 3 to record the image on the projection plate 3. During the inspection process, the cam 5 to be inspected is fixed on the clamping mechanism 1. The light source mechanism 2 emits light to the cam 5, and the light is reflected onto the projection plate 3 after reaching the cam 5, presenting an image with black and white stripes on the projection plate 3. The imaging mechanism 4 records this image with black and white stripes and transmits it to the controller for judgment of vibration texture defects. If the image has obvious alternating black and white stripes, the controller judges that the cam 5 has a vibration texture defect. If the image does not have obvious alternating black and white stripes, the cam 5 is judged to be a qualified product.
[0043] In summary, this utility model embodiment provides a cam vibration mark defect detection device for engine camshafts. It uses a laser to "magnify" the vibration mark abnormality and project it onto the projection plate 3 to accurately detect the vibration mark defect of the cam 5. This replaces manual inspection, prevents the influence of external factors, improves the accuracy of inspection, prevents defective products from flowing out, saves labor costs, and improves inspection efficiency.
[0044] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this utility model, and these improvements and substitutions should also be considered within the protection scope of this utility model.
Claims
1. A device for detecting cam vibration marks on an engine camshaft, characterized in that, include: A fixed platform, on which a camshaft is fixed; A clamping mechanism for fixing the camshaft and driving the camshaft to rotate; A light source mechanism, wherein the light source mechanism is disposed toward the clamping mechanism; A projection plate is disposed on one side of the clamping mechanism, and the light emitted by the light source mechanism is reflected onto the projection plate after reaching the clamping mechanism; A camera mechanism, which faces the projection panel to record the image projected by the projection panel; A controller electrically connected to the imaging mechanism to process images captured by the imaging mechanism.
2. The cam vibration mark defect detection device for engine camshafts according to claim 1, characterized in that: The clamping mechanism includes a first clamping part and a second clamping part, which are respectively disposed on both sides of the camshaft to clamp the camshaft.
3. The cam vibration mark defect detection device for engine camshafts according to claim 1, characterized in that: The camshaft is connected to a rotary motor, which drives the camshaft to rotate at a constant speed.
4. The cam vibration mark defect detection device for engine camshafts according to claim 2, characterized in that: The fixed platform is provided with a first fixed position and a second fixed position. The first fixed position and the second fixed position are respectively used to fix camshafts of different sizes. The camshafts fixed at the first fixed position and the second fixed position are clamped by a cylinder assembly.
5. The camshaft vibration mark defect detection device for engine camshafts according to claim 4, characterized in that: The first clamping part is provided with a first clamping cylinder and a second clamping cylinder, and the second clamping part is provided with a third clamping cylinder. The first clamping cylinder drives the first clamping part to clamp the camshaft located at the first fixed position. The first clamping cylinder and the second clamping cylinder drive the first clamping part to clamp the camshaft located at the second fixed position. The third clamping cylinder drives the second clamping part to clamp the camshaft located at the first fixed position and the second fixed position.
6. The camshaft vibration mark defect detection device for engine camshafts according to claim 1, characterized in that: The light source mechanism includes a linear laser light source, which is aligned with the cam fixed by the clamping mechanism.
7. The camshaft vibration mark defect detection device for engine camshafts according to claim 1, characterized in that: The imaging mechanism includes an industrial camera, the lens of which is aimed at the projection panel.
8. The camshaft vibration mark defect detection device for engine camshafts according to claim 1, characterized in that: The projection panel is set perpendicular to the horizontal plane.
9. The camshaft vibration mark defect detection device for engine camshafts according to claim 1, characterized in that: The light from the light source mechanism is projected onto the waist of the cam during the detection process.