Washing machine cylinder assembly surface defect detection system and detection method
By performing light and shadow imaging of the washing machine barrel assembly in the axial and radial directions, combined with image capture of industrial cameras, the problem of difficulty in detecting the outer convex and concave defects of the cylinder surface in the prior art is solved, and more efficient and comprehensive defect detection is achieved, and product quality is improved.
Patent Information
- Application Number
- CN202411538789.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-03-18
AI Technical Summary
The prior art is difficult to efficiently and comprehensively detect defects in the outer convex and concave structures of the surface of the washing machine barrel assembly, resulting in low detection efficiency and unstable product quality.
The technology of light-shading imaging of the inner cylinder assembly in the axial and radial directions is adopted, and combined with the light-shading image capture of industrial cameras, axial and radial vision detection units are built to achieve comprehensive detection of cylinder surface defects.
Through light and shadow imaging technology, the outer convex and concave structural defects that are not easily visually obtained on the surface of the cylinder can be detected, which improves the comprehensiveness and efficiency of surface defect detection and ensures the stability of product quality.
Smart Images
Figure CN119643588A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of surface defect detection of washing machine drum assemblies, and in particular relates to a system and method for detecting surface defects of washing machine drum assemblies. Background Art
[0002] Figure 1 The inner drum assembly of the washing machine is mainly assembled from three parts, namely, the inner drum, the upper cover and the rear cover. Affected by the assembly pressure, the inner drum of the inner drum assembly is a structural part that is more easily deformed, including inner concave and outer convexity under pressure, and scratches and cracks under scratches. Therefore, the assembled inner drum assembly needs to be inspected on the surface to prevent the above situation. Since the structure of the assembled inner drum assembly is relatively bulky, it is difficult to achieve comprehensive and efficient maintenance by manual visual observation, which has affected the production capacity and product quality to a certain extent. Summary of the invention
[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a system and method for detecting surface defects of a washing machine drum assembly. By performing light and shadow imaging of the inner drum assembly in the axial and radial directions respectively, and cooperating with the light and shadow image capture of an industrial camera, it is possible to detect convex and concave structural defects on the drum surface that are not easily visually obtained, thereby improving the comprehensiveness and efficiency of surface defect detection.
[0004] Technical solution: To achieve the above-mentioned purpose, the surface defect detection system of the washing machine drum assembly of the present invention is used for the surface visual defect detection of the inner drum assembly assembled by the inner drum, upper cover and rear cover of the washing machine, and comprises a frame, the frame is provided with a rotating shaft, the rotating shaft cooperates with the axial hole of the rear cover, so that the inner drum assembly is axially mounted on the frame; the frame is also provided with an industrial camera, a projection light source and a shadow-forming screen board, the projection light source corresponds to the shadow-forming screen board and is respectively located on both sides of the inner drum assembly, the industrial camera faces the inner drum assembly and is arranged on the same side as the projection light source; when the projection light source projects light toward the inner drum assembly in a rotating state, it can form the outer structure contour light and shadow of the inner drum assembly on the shadow-forming screen board, and the industrial camera captures the surface structure image of the inner drum assembly and the corresponding outer structure contour light and shadow image at the same time.
[0005] Further, relative to the inner cylinder assembly, the industrial camera includes an axial industrial camera and a radial industrial camera, the projection light source includes an axial projection light source and a radial projection light source, and the imaging screen includes an axial imaging screen and a radial imaging screen;
[0006] The axial projection light source corresponds to the axial imaging screen plate and is respectively arranged on two axial sides of the inner cylinder assembly. The axial industrial camera is arranged on the same side as the axial projection light source, so that the axial industrial camera, the axial projection light source and the axial imaging screen plate constitute an axial visual detection unit for acquiring a surface structure image and an outer structure contour light and shadow image of the inner cylinder assembly in the axial direction;
[0007] The radial projection light source corresponds to the radial imaging screen plate and is respectively arranged on the radial side of the inner cylinder assembly. The radial industrial camera is arranged on the same side as the radial projection light source, so that the radial industrial camera, the radial projection light source and the radial imaging screen plate constitute a radial visual inspection unit for acquiring the surface structure image and the outer structure contour light and shadow image of the inner cylinder assembly in the radial direction.
[0008] Furthermore, the axial vision detection unit and the radial vision detection unit are independent of each other and operate in a staggered manner.
[0009] Further, when the axial visual inspection unit is in operation and when the radial visual inspection unit is in operation, the inner cylinder assembly maintains a circumferential rotation state by following the rotating shaft.
[0010] Further, in the axial visual detection unit, the first incident light of the axial projection light source is parallel to the central axis of the inner cylinder assembly;
[0011] In the radial vision detection unit, the second incident light of the radial projection light source extends toward the radial direction of the inner cylinder assembly.
[0012] Furthermore, a rotation driving part connected to the rotating shaft is installed on the frame, and the rotation driving part drives the rotating shaft to drive the inner cylinder assembly to rotate circumferentially.
[0013] Furthermore, a baffle is provided on the rotating shaft, and the inner cylinder assembly installed on the rotating shaft is limited in position by axial blocking of the baffle.
[0014] The detection method of the washing machine drum assembly surface defect detection system, the specific steps are as follows:
[0015] Step S1: Install the inner cylinder assembly on the rotating shaft through the shaft and the hole, and start the rotation drive unit to drive the inner cylinder assembly to rotate circumferentially;
[0016] Step S2: running the axial visual inspection unit, the axial projection light source projects a first incident light in the axial direction toward the inner cylinder assembly, so as to form an outer structure contour light and shadow in the axial direction on the axial imaging screen plate, and the axial industrial camera captures the surface structure image of the inner cylinder assembly in the axial direction on the one hand, and captures the outer structure contour light and shadow image of the inner cylinder assembly in the axial direction on the other hand;
[0017] By capturing the surface structure image of the inner cylinder assembly in the axial direction, the surface structure image of the upper cover in the axial direction is obtained;
[0018] By capturing the light and shadow image of the outer structure contour of the inner cylinder assembly in the axial direction, the light and shadow image of the outer structure contour of the inner cylinder in the radial direction is obtained. Specifically, when the light and shadow image of the outer structure contour appears convex, it indicates that a convex structural defect occurs on the cylinder wall of the inner cylinder.
[0019] Step S3: the radial visual inspection unit is operated, the radial projection light source projects a second incident light in a radial direction toward the inner cylinder assembly, so as to form an outer structure contour light and shadow in a radial direction on the radial imaging screen plate, and the radial industrial camera captures the surface structure image of the inner cylinder assembly in the radial direction on the one hand, and the outer structure contour light and shadow image of the inner cylinder assembly in the radial direction on the other hand;
[0020] By capturing the surface structure image of the inner cylinder assembly in the radial direction, the surface structure image of the inner cylinder and the upper cover in the radial direction is obtained;
[0021] By capturing the light and shadow image of the outer structure contour of the inner cylinder assembly in the radial direction, the light and shadow image of the outer structure contour of the inner cylinder in the radial direction is obtained. Specifically, when the light and shadow image of the outer structure contour appears convex, it indicates that a convex structural defect occurs on the cylinder wall of the inner cylinder.
[0022] And when the light and shadow image of the contour of the peripheral structure appears concave, it indicates that a concave structural defect occurs in the wall of the inner tube.
[0023] Beneficial effect: The present invention performs axial and radial light and shadow imaging on the inner cylinder assembly respectively, and cooperates with the light and shadow image capture of the industrial camera to detect the convex and concave structural defects on the cylinder surface that are not easily visually obtained, thereby improving the comprehensiveness and efficiency of surface defect detection. Specifically, by performing axial light and shadow imaging on the inner cylinder assembly, the axial industrial camera 31 can be used to obtain whether the inner cylinder has convex defects under radial pressure. By performing radial light and shadow imaging on the inner cylinder assembly, the radial industrial camera can obtain whether the inner cylinder has concave defects under radial pressure. Combined with the circumferential rotation of the inner cylinder assembly, more comprehensive and efficient visual detection of surface defects can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 It is a schematic diagram of the overall structural state and the decomposed structural state of the inner drum assembly of the washing machine;
[0025] Figure 2 It is a three-dimensional structural schematic diagram of a washing machine drum assembly surface defect detection system;
[0026] Figure 3It is a schematic diagram of the main structure of the washing machine drum assembly surface defect detection system;
[0027] Figure 4 It is a structural schematic diagram of the axial visual detection unit;
[0028] Figure 5 It is a schematic diagram of the structure of the radial vision detection unit;
[0029] Figure 6 The present invention is a flow chart of a detection method of a washing machine drum assembly surface defect detection system. DETAILED DESCRIPTION
[0030] The present invention will be further described below in conjunction with the accompanying drawings.
[0031] like Figure 1 and Figure 2 As shown, a washing machine drum assembly surface defect detection system is used for surface visual defect detection of an inner drum assembly 1 assembled from an inner drum 11, an upper cover 12 and a rear cover 13 of the washing machine, and is characterized in that: it includes a frame 10, on which a rotating shaft 2 is provided, and the rotating shaft 2 cooperates with the axial hole of the rear cover 13 so that the inner drum assembly 1 is axially mounted on the frame 10; the frame 10 is also provided with an industrial camera 3, a projection light source 4 and a shadow-forming screen 5, the projection light source 4 corresponds to the shadow-forming screen 5 and is respectively located on both sides of the inner drum assembly 1, the industrial camera 3 faces the inner drum assembly 1 and is arranged on the same side as the projection light source 4; when the projection light source 4 projects light toward the rotating inner drum assembly 1, it can form a light and shadow of the outer structure contour of the inner drum assembly 1 on the shadow-forming screen 5, and the industrial camera 3 captures the surface structure image of the inner drum assembly 1 while capturing the corresponding light and shadow image of the outer structure contour. More specifically, as Figure 3 As shown, relative to the inner cylinder assembly 1, the industrial camera 3 includes an axial industrial camera 31 and a radial industrial camera 32, the projection light source 4 includes an axial projection light source 41 and a radial projection light source 42, and the imaging screen 5 includes an axial imaging screen 51 and a radial imaging screen 52. Figure 4 As shown, the axial projection light source 41 corresponds to the axial imaging screen plate 51, and is respectively arranged on the two axial sides of the inner cylinder component 1, and the axial industrial camera 31 is arranged on the same side as the axial projection light source 41, so that the axial industrial camera 31, the axial projection light source 41 and the axial imaging screen plate 51 constitute an axial visual detection unit for acquiring the surface structure image and the outer structure contour light and shadow image of the inner cylinder component 1 in the axial direction; Figure 5As shown, the radial projection light source 42 corresponds to the radial imaging screen plate 52 and is respectively arranged on the radial side of the inner cylinder component 1. The radial industrial camera 32 is arranged on the same side as the radial projection light source 42, so that the radial industrial camera 32, the radial projection light source 42 and the radial imaging screen plate 52 constitute a radial visual inspection unit for acquiring the surface structure image and the outer structure contour light and shadow image of the inner cylinder component 1 in the radial direction. The present invention performs light and shadow imaging on the inner cylinder component 1 in the axial and radial directions respectively, and cooperates with the light and shadow image capture of the industrial camera 3 to detect the convex and concave structural defects on the cylinder surface that are not easily visually obtained, thereby improving the comprehensiveness and efficiency of surface defect detection, wherein the inner cylinder component 1 is subjected to axial light and shadow imaging, and the axial industrial camera 31 can obtain whether the inner cylinder 11 has a convex defect under pressure in the radial direction, and the inner cylinder component 1 is subjected to radial light and shadow imaging, and the radial industrial camera 32 can obtain whether the inner cylinder 11 has a concave defect under pressure in the radial direction, and then cooperate with the circumferential rotation of the inner cylinder component 1, thereby realizing a more comprehensive and efficient visual inspection of surface defects.
[0032] In order to avoid axial and radial light interference, in the present invention, the axial visual detection unit and the radial visual detection unit are independent of each other and operate in a staggered manner.
[0033] It is worth noting that when the axial visual detection unit is in operation and the radial visual detection unit is in operation, the inner cylinder assembly 1 maintains a circumferential rotation state by following the rotating shaft 2. When the inner cylinder assembly 1 is in a circumferential rotation state, axial light and shadow imaging can obtain more images for reference and comparison with each other to improve detection accuracy, while radial light and shadow imaging achieves full circumferential coverage of the surface of the inner cylinder 11, further improving the comprehensiveness of detection.
[0034] It should be noted here that radial light and shadow imaging can also detect convex structural defects on the surface of the inner cylinder 11. In terms of convex structural defects, axial light and shadow imaging and radial light and shadow imaging can verify each other, thereby improving detection accuracy.
[0035] In the present invention, the inner cylinder assembly 1 is preferably arranged in a horizontal position, which can facilitate the installation and removal of the inner cylinder assembly 1 relative to the rotating shaft 2 and improve efficiency. Figure 4 As shown, in the axial visual detection unit, the first incident light 8 of the axial projection light source 41 is parallel to the central axis of the inner cylinder assembly 1; Figure 5 As shown, in the radial visual detection unit, the second incident light 9 of the radial projection light source 42 extends radially toward the inner cylinder assembly 1 .
[0036] like Figure 2 and Figure 3As shown, the frame 10 is provided with a rotation driving part 6 connected to the rotating shaft 2, and the rotation driving part 6 drives the rotating shaft 2 to drive the inner cylinder assembly 1 to rotate in the circumferential direction. The rotating shaft 2 is provided with a baffle 7, and the inner cylinder assembly 1 installed on the rotating shaft 2 is limited in the installed position by the axial blocking of the baffle 7. The rotation driving part 6 can be a stepping motor.
[0037] like Figure 6 As shown, the detection method of the washing machine drum assembly surface defect detection system, the specific steps are as follows:
[0038] Step S1: The inner cylinder assembly 1 is mounted on the rotating shaft 2 through the shaft and the hole, and the rotation driving part 6 is started to drive the inner cylinder assembly 1 to rotate circumferentially;
[0039] Step S2: running the axial visual inspection unit, the axial projection light source 41 projects the first incident light 8 toward the inner cylinder assembly 1 in the axial direction, so as to form an outer structure contour light and shadow in the axial direction on the axial shadow-forming screen plate 51, and the axial industrial camera 31 captures the surface structure image of the inner cylinder assembly 1 in the axial direction on the one hand, and captures the outer structure contour light and shadow image of the inner cylinder assembly 1 in the axial direction on the other hand;
[0040] By capturing the surface structure image of the inner cylinder assembly 1 in the axial direction, the surface structure image of the upper cover 12 in the axial direction is obtained;
[0041] By capturing the light and shadow image of the outer structure contour of the inner cylinder assembly 1 in the axial direction, the light and shadow image of the outer structure contour of the inner cylinder 11 in the radial direction is obtained. Specifically, when the light and shadow image of the outer structure contour appears convex, it indicates that a convex structure defect occurs on the cylinder wall of the inner cylinder 11.
[0042] Step S3: the radial visual inspection unit is operated, the radial projection light source 42 projects the second incident light 9 in the radial direction toward the inner cylinder assembly 1, so as to form the outer structure contour light and shadow in the radial direction on the radial shadow-forming screen plate 52, and the radial industrial camera 32 captures the surface structure image of the inner cylinder assembly 1 in the radial direction on the one hand, and captures the outer structure contour light and shadow image of the inner cylinder assembly 1 in the radial direction on the other hand;
[0043] By capturing the surface structure image of the inner cylinder assembly 1 in the radial direction, the surface structure image of the inner cylinder 11 and the upper cover 12 in the radial direction is obtained;
[0044] By capturing the light and shadow image of the outer structure contour of the inner cylinder assembly 1 in the radial direction, the light and shadow image of the outer structure contour of the inner cylinder 11 in the radial direction is obtained. Specifically, when the light and shadow image of the outer structure contour appears convex, it indicates that a convex structure defect occurs on the cylinder wall of the inner cylinder 11.
[0045] And when the light and shadow image of the peripheral structure contour appears concave, it indicates that a concave structural defect occurs in the wall of the inner tube 11 .
[0046] In the inner drum assembly 1 of the washing machine, the inner drum 11 is most prone to structural defects due to the influence of assembly and the structure of the parts themselves. The structural defects are mainly scratches, cracks, convexities and concavities. Among them, scratches and cracks are easy to judge by visual inspection, while convexities and concavities are affected by external factors such as viewing angle and light, as well as the size of the defect area, and are difficult to detect purely visually. This patent application participates in the visual defect detection of the drum assembly through axial and radial light and shadow imaging technology, changing from three-dimensional to two-dimensional, and can directly obtain information from the light and shadow imaging structure contour, which is more visually obvious, and the detection quality and accuracy have been significantly improved.
[0047] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.
Claims
1. A washing machine drum assembly surface defect detection system, the system is used for surface visual defect detection of an inner drum assembly (1) assembled from an inner drum (11), an upper cover (12), and a rear cover (13) of a washing machine, and is characterized by: The invention comprises a frame (10), wherein a rotating shaft (2) is arranged on the frame (10), wherein the rotating shaft (2) cooperates with the shaft hole of the rear cover (13), so that the inner cylinder component (1) is rotatably mounted on the frame (10); an industrial camera (3), a projection light source (4) and a shadow screen (5) are also arranged on the frame (10), wherein the projection light source (4) corresponds to the shadow screen (5) and is respectively located on both sides of the inner cylinder component (1), and the industrial camera (3) faces the inner cylinder component (1) and is arranged on the same side as the projection light source (4); when the projection light source (4) projects light toward the rotating inner cylinder component (1), an outer structural contour light and shadow of the inner cylinder component (1) can be formed on the shadow screen (5), and the industrial camera (3) captures the surface structural image of the inner cylinder component (1) and the corresponding outer structural contour light and shadow image at the same time.
2. The washing machine drum assembly surface defect detection system according to claim 1, characterized in that: Relative to the inner cylinder assembly (1), the industrial camera (3) includes an axial industrial camera (31) and a radial industrial camera (32), the projection light source (4) includes an axial projection light source (41) and a radial projection light source (42), and the imaging screen (5) includes an axial imaging screen (51) and a radial imaging screen (52); The axial projection light source (41) corresponds to the axial imaging screen plate (51) and is respectively arranged on two axial sides of the inner cylinder component (1); the axial industrial camera (31) is arranged on the same side as the axial projection light source (41), so that the axial industrial camera (31), the axial projection light source (41) and the axial imaging screen plate (51) constitute an axial visual detection unit for acquiring a surface structure image and an outer structure contour light and shadow image of the inner cylinder component (1) in the axial direction; The radial projection light source (42) corresponds to the radial imaging screen plate (52) and is respectively arranged on the radial side of the inner cylinder component (1). The radial industrial camera (32) is arranged on the same side as the radial projection light source (42), so that the radial industrial camera (32), the radial projection light source (42) and the radial imaging screen plate (52) constitute a radial visual detection unit for acquiring a surface structure image and an outer structure contour light and shadow image of the inner cylinder component (1) in a radial direction.
3. The washing machine drum assembly surface defect detection system according to claim 2, characterized in that: The axial vision detection unit and the radial vision detection unit are independent of each other and operate in a staggered manner.
4. The washing machine drum assembly surface defect detection system according to claim 3, characterized in that: When the axial visual inspection unit is in operation and when the radial visual inspection unit is in operation, the inner cylinder assembly (1) maintains a circumferential rotation state by following the rotating shaft (2).
5. The washing machine drum assembly surface defect detection system according to claim 4, characterized in that: In the axial visual detection unit, the first incident light (8) of the axial projection light source (41) is parallel to the central axis of the inner cylinder assembly (1); In the radial visual detection unit, the second incident light (9) of the radial projection light source (42) extends in the radial direction of the inner cylinder assembly (1).
6. The washing machine drum assembly surface defect detection system according to claim 5, characterized in that: The frame (10) is provided with a rotation driving part (6) drivingly connected to the rotating shaft (2), and the rotation driving part (6) drives the rotating shaft (2) to drive the inner cylinder assembly (1) to rotate in a circumferential direction.
7. The washing machine drum assembly surface defect detection system according to claim 6, characterized in that: The rotating shaft (2) is provided with a baffle (7), and the inner cylinder assembly (1) mounted on the rotating shaft (2) is limited in position by axial blocking of the baffle (7).
8. The detection method of the washing machine drum assembly surface defect detection system according to claim 7, characterized in that: The specific steps are as follows: Step S1: The inner cylinder assembly (1) is mounted on the rotating shaft (2) through the shaft and the hole, and the rotation driving part (6) is started to drive the inner cylinder assembly (1) to rotate in a circumferential direction; Step S2: running the axial visual inspection unit, the axial projection light source (41) projects the first incident light (8) toward the inner cylinder component (1) in the axial direction, thereby forming an outer structure contour light and shadow in the axial direction on the axial imaging screen (51), and the axial industrial camera (31) captures the surface structure image of the inner cylinder component (1) in the axial direction on the one hand, and captures the outer structure contour light and shadow image of the inner cylinder component (1) in the axial direction on the other hand; By capturing the surface structure image of the inner cylinder component (1) in the axial direction, the surface structure image of the upper cover (12) in the axial direction is obtained; By capturing the light and shadow image of the outer structure contour of the inner cylinder component (1) in the axial direction, the light and shadow image of the outer structure contour of the inner cylinder (11) in the radial direction is obtained. Specifically, when the light and shadow image of the outer structure contour appears convex, it indicates that a convex structure defect occurs on the cylinder wall of the inner cylinder (11); Step S3: the radial visual inspection unit is operated, the radial projection light source (42) projects the second incident light (9) in a radial direction toward the inner cylinder component (1), so as to form an outer structure contour light and shadow in a radial direction on the radial shadow-forming screen plate (52), and the radial industrial camera (32) captures the surface structure image of the inner cylinder component (1) in the radial direction on the one hand, and captures the outer structure contour light and shadow image of the inner cylinder component (1) in the radial direction on the other hand; By capturing the surface structure image of the inner cylinder assembly (1) in the radial direction, the surface structure image of the inner cylinder (11) and the upper cover (12) in the radial direction is obtained; By capturing the light and shadow image of the outer structure contour of the inner cylinder component (1) in the radial direction, the light and shadow image of the outer structure contour of the inner cylinder (11) in the radial direction is obtained. Specifically, when the light and shadow image of the outer structure contour appears convex, it indicates that a convex structure defect occurs on the cylinder wall of the inner cylinder (11); When the light and shadow image of the peripheral structure contour appears concave, it indicates that a concave structural defect occurs in the wall of the inner tube (11); As the inner cylinder assembly (1) rotates, full coverage concave structural defect detection of the inner cylinder (11) in the circumferential direction is completed.