Enamel liner detection device and detection method thereof

Abstract

The invention discloses an enamel inner container detection device and a detection method of the enamel inner container detection device, and relates to the technical field of inner container defect detection.The enamel inner container detection device comprises at least one detection unit, and the detection unit is used for stretching into an enamel inner container from an opening of the enamel inner container. The detection unit comprises a micro imaging structure and a light-emitting part which are arranged at an interval, and the irradiation range of the light-emitting part is not smaller than the view field range of the micro imaging structure; wherein the distance between the light-emitting part and the miniature imaging structure is X, X is used for being set to be larger than L, and L is the projection length of the long side of the visual field of the miniature imaging structure on the enamel inner container. By means of the arrangement, the camera can adapt to the irregular shape of the enamel inner container, specular reflection light is prevented from entering the camera, an overexposure area can be avoided, and the camera can be matched with existing accessories on the market on the premise that reflection light is not generated.

Description

Technical Field

[0001] The present invention relates to the technical field of inner liner defect detection, and in particular to an enamel inner liner detection device and a detection method thereof. Background Art

[0002] During the production process of enamel liner, the inner surface of the liner must be inspected for defects. Existing production lines rely heavily on manual inspection, using flashlights to illuminate the liner, with the human eye making a judgment within 4-6 seconds. However, automated inspection is difficult because when using cameras for visual analysis and inspection, strong reflections from the light source can occur, resulting in low detection rates and a high incidence of false positives. Summary of the Invention

[0003] The main purpose of the present invention is to propose an enamel liner detection device and an enamel liner detection method. By reasonably arranging the lighting and imaging structure, the collected image can effectively eliminate the reflection phenomenon, the image distortion is small, and the imaging quality is good, thereby improving the accuracy of automatic liner detection.

[0004] To achieve the above objectives, the present invention provides a porcelain enamel container inspection device, comprising at least one inspection unit, the inspection unit being configured to extend from an opening of the porcelain enamel container into the interior of the container, the inspection unit comprising a micro-imaging structure and a light-emitting portion disposed at intervals, the illumination range of the light-emitting portion being no less than the field of view of the micro-imaging structure;

[0005] The distance between the light emitting portion and the micro-imaging structure is X, and X is set to be greater than L, where L is the projection length of the long side of the field of view of the micro-imaging structure on the enamel inner container.

[0006] In one embodiment, the light-emitting portion is arranged to be inclined toward the direction of the micro-imaging structure, and in the direction away from the micro-imaging device, the angle θ formed by the boundary line of the divergence angle of the light-emitting portion and the inner wall of the enamel liner needs to satisfy θ=tan^(-1)[d / (X-0.5L)], where d is the distance between the micro-imaging structure and the inner wall surface of the enamel liner.

[0007] In one embodiment, the light emitting portion includes a point light source.

[0008] In one embodiment, the enamel liner detection device further includes a base having a placement area, wherein the placement area is used to place the enamel liner to be detected;

[0009] The detection unit is movably mounted on the base and is arranged corresponding to the placement area so as to have an active state and a docked state during the movement process. In the docked state, the detection unit is located inside the enamel inner pot and is fixedly arranged. In the active state, the detection unit can move along the axial direction of the enamel inner pot.

[0010] In one embodiment, the enamel liner detection device further comprises a bracket, and the bracket is movably installed along the axial direction of the enamel liner;

[0011] The light emitting portion and the micro imaging structure of the detection unit are arranged on the bracket at intervals.

[0012] In one embodiment, the bracket is rotatably mounted along an axis extending axially of the enamel inner container; and / or,

[0013] The bracket includes a main body and multiple extension arms arranged at the end of the main body. The multiple extension arms are used to correspond to the bottom of the enamel inner pot. Two adjacent extension arms are arranged at an angle. The detection unit is provided on the main body and the multiple extension arms.

[0014] In one embodiment, a plurality of the detection units are provided, and the plurality of the detection units include two first detection units. In the two first detection units, the two micro-imaging structures are arranged adjacent to each other, and the two light-emitting parts are arranged on both sides of the two micro-imaging structures facing away from each other, and the light emitted by the two light-emitting parts is inclined in a direction approaching each other.

[0015] In one embodiment, the enamel liner detection device includes a bracket;

[0016] The plurality of detection units are arranged along the circumference of the bracket.

[0017] In one embodiment, in the plurality of detection units, a fitting gap is formed between two adjacent micro-imaging structures, and at least part of the light-emitting portion is located in the fitting gap.

[0018] The present invention also provides a detection method for an enamel liner detection device. Based on the above-mentioned enamel liner detection device, the enamel liner detection device includes multiple detection units. The detection method for the enamel liner detection device includes the following steps:

[0019] Obtain information about the enamel liner to be tested and build a liner model;

[0020] Determining a layout strategy of the detection components based on the inner liner model, wherein the layout strategy includes the number and arrangement positions of the micro-imaging structures and the light-emitting parts;

[0021] After the detection component is placed according to the arrangement strategy, the detection component is controlled to extend into the enamel liner to be detected, and the detection component is controlled to move out after staying there for a preset time;

[0022] Imaging information of the plurality of micro-imaging structures is obtained to confirm the detection result of the enamel liner.

[0023] In the technical solution of the present invention, the micro-imaging structure generally uses scattered light for imaging. Therefore, if specularly reflected light enters the micro-imaging structure, overexposed areas will occur. This requires that the light-emitting portion illuminate the entire area of the micro-imaging structure's field of view, and that specularly reflected light from the light-emitting portion cannot enter the micro-imaging structure. Therefore, by limiting the illumination range of the light-emitting portion to no less than the field of view of the micro-imaging structure, the illumination range is ensured to fully cover the field of view of the micro-imaging structure. The layout rules for the light-emitting portion and the micro-imaging structure must also satisfy X>L. This is to accommodate the irregular shape of the enamel inner container, prevent specularly reflected light from entering the micro-imaging structure, and allow compatibility with existing commercially available accessories without generating reflected light. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0025] Figure 1 A schematic diagram of an embodiment of a device for detecting an enamel liner provided by the present invention;

[0026] Figure 2 for Figure 1 Schematic diagram of the structure of the detection unit;

[0027] Figure 3 for Figure 1 A schematic structural diagram of the detection component (first embodiment);

[0028] Figure 4 for Figure 1 A schematic structural diagram of the detection component (second embodiment);

[0029] Figure 5 A schematic diagram of another embodiment of the enamel liner detection device provided by the present invention;

[0030] Figure 6(a) Figure 1 A schematic diagram of an orientation design of the central light-emitting portion and the micro-imaging structure;

[0031] Figure 6(b) Figure 1 Schematic diagram of another orientation design of the central light-emitting portion and the micro-imaging structure;

[0032] Figure 7 This is a flow chart of the detection method of the enamel liner detection device provided by the present invention.

[0033] Description of Figure Numbers:

[0034] 1. Detection unit; 11. Micro-imaging structure; 12. Light-emitting part.

[0035] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0037] It should be noted that if a directional indication is involved in an embodiment of the present invention, the directional indication is only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0038] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0039] The enamel liner is made by coating a layer of inorganic ceramic glaze on the surface of the ordinary liner. This design allows the enamel liner to withstand a wide range of temperature changes while also having excellent physical and chemical properties.

[0040] During the production process of enamel liner, the inner surface of the liner needs to be inspected for defects. Existing production lines rely heavily on manual inspection, using flashlights to illuminate the liner. The human eye can make a judgment within 4-6 seconds, leading to a strong demand for automation in this inspection area. However, achieving automated inspection is challenging due to the strong reflections from the light source during visual analysis and inspection using cameras. This results in low detection rates and a high number of false positives, hindering automation. Therefore, preventing strong reflections from the liner during imaging remains a major pain point in the industry.

[0041] The present invention provides an enamel liner detection device and an enamel liner detection method. By rationally arranging the lighting and imaging structure, images collected by the device can effectively eliminate reflections, have small image distortion, and have good imaging quality, thereby improving the accuracy of automated liner detection.

[0042] Please refer to Figures 1 to 2 The enamel liner detection device 1 includes at least one detection unit 1, which is used to extend from the opening of the enamel liner into the interior of the enamel liner. The detection unit 1 includes a micro-imaging structure 11 and a light-emitting portion 12 arranged at intervals. The illumination range of the light-emitting portion 12 is not less than the field of view of the micro-imaging structure 11; wherein, the distance between the light-emitting portion 12 and the micro-imaging structure 11 is X, and X is set to be greater than L, and L is the projection length of the long side of the field of view of the micro-imaging structure 11 on the enamel liner.

[0043] In the technical solution of the present invention, the micro-imaging structure 11 generally uses scattered light for imaging. Therefore, if specularly reflected light enters the micro-imaging structure 11, overexposed areas will occur. This requires that the light-emitting portion 12 illuminate the entire field of view of the micro-imaging structure 11, and that specularly reflected light from the light-emitting portion 12 cannot enter the micro-imaging structure 11. Therefore, by limiting the illumination range of the light-emitting portion 12 to no less than the field of view of the micro-imaging structure 11, the illumination range is ensured to fully cover the field of view of the micro-imaging structure 11. The layout of the light-emitting portion 12 and the micro-imaging structure 11 also requires that X>L be satisfied. This allows the device to accommodate the irregular shape of the enamel inner container, prevent specularly reflected light from entering the micro-imaging structure, and, while ensuring no reflected light, be compatible with existing commercially available accessories.

[0044] Specifically, the long side of the field of view refers to the length of the field of view of the micro-imaging structure 11 in the horizontal direction, that is, the width of the field of view.

[0045] The micro-imaging structure 11 can be an endoscope, a camera, etc., as long as it can meet the micro-imaging principle, and the present invention does not limit this.

[0046] Please refer to Figures 2 to 4, marks P, P', P" are the starting points of the field of view of the micro-imaging structure 11, marks P1, P1', P1" are one end point of the length of the long side of the field of view of the micro-imaging structure 11 projected on the enamel inner container, marks P2, P2', P2" are the other end point of the length of the long side of the field of view of the micro-imaging structure 11 projected on the enamel inner container, marks Q, Q', Q" are the starting points of the light-emitting portion 12, marks Q1, Q1', Q1" are one end point of the long side of the light projection of the light-emitting portion 12 on the enamel inner container, marks Q2, Q2', Q2" are the other end point of the long side of the light projection of the light-emitting portion 12 on the enamel inner container, and some end points may overlap;

[0047] by Figure 1 For example, the triangle enclosed by endpoints P, P1, and P2 constitutes the field of view of the micro-imaging structure 11, and the triangle enclosed by endpoints Q, Q1, and Q2 constitutes the illumination area of the light-emitting portion 12, wherein the length of the line segment P1P2 is L, the straight-line distance between the endpoints P and P1 defines d, and the length of the line segment PQ is X.

[0048] The present invention does not limit the specific structural form of the light-emitting part 12. The light-emitting part 12 only needs to meet the requirements of the light source illumination range. Specifically, the light-emitting part 12 includes a point light source. The point light source refers to a light source that emits light uniformly from a point to the surrounding space, that is, the light of the point light source is divergent and has a certain divergence angle. This is because in actual application scenarios, the enamel liner generally needs to extend the detection unit 1 from the narrow liner opening and complete a full scan of the liner, while the bowl-shaped light source, parallel light source, and surface light source, on the one hand, have different forms of light, and on the other hand, are generally larger in size and are greatly limited by the size of the enamel liner. In this device, in order to obtain minimal distortion imaging and a reflection-free lighting system, the light-emitting part 12 is a light source with a certain divergence angle.

[0049] It should be noted that, depending on the placement of the enamel inner container, the light emitting portion 12 and the micro imaging structure 11 can be spaced apart in the horizontal direction or in the vertical direction, and the two should be based on the axial direction of the enamel inner container as a reference.

[0050] Taking the cooperation of endoscope and light source to realize the inspection of enamel liner as an example, the principle of realization is explained.

[0051] The positioning of the endoscope and light source must be designed to avoid overexposure in the image. Due to the irregular shape of the inner liner, from the perspective of image distortion, the smaller the image distortion, the more beneficial it is for post-processing and defect analysis, without the need for additional correction. Furthermore, the smaller the image distortion, the smaller the difference in object-space resolution at each point in the image, maximizing the performance of the endoscope.

[0052] Refer to Figure 6. Specular reflections from the light source (the red dashed lines in Figures 6(a) and 6(b)) enter the endoscope, resulting in overexposure on the endoscope's image. Ideally, the distance X between the light source and the endoscope should be sufficiently large. This is because a larger value for X reduces the constraint on the light source's divergence angle, preventing specular reflections from entering the endoscope and thus preventing overexposure.

[0053] In order to prevent the specular reflection light emitted by the light source from entering the endoscope, some solutions can use dual-side light sources for simultaneous illumination, or a single light source can illuminate the field of view of 1.5 endoscopes at the same time. However, this implementation requires strict control of the distance X between the light source and the endoscope, as well as the tilt angle of the light source. In this solution, if the angle and divergence angle of the light source deviate slightly, specular reflection light will enter the endoscope, resulting in overexposure. Precise control of the divergence angle of the light source is difficult to achieve.

[0054] For example, assuming that the line connecting the endoscope and the light source is parallel to the axis, the light source is located at the 1 / 4 field of view next to the endoscope, and the field of view angle is 74°, then the divergence angle of the light source is:

[0055]

[0056] If the light source divergence angle is slightly larger, there will be specular reflected light entering the endoscope. Assuming R = 4mm, d = 160mm:

[0057] The divergence angle is:

[0058]

[0059] Among them, α is the field of view of the endoscope, which generally ranges from 40° to 120°, R is the outer diameter of the endoscope lens, which generally ranges from 4mm to 10mm, and d is the distance between the endoscope and the inner wall of the enamel liner.

[0060] The results indicate that the aforementioned approach places high demands on the light source's divergence angle, making it difficult to achieve. This can easily lead to overexposure due to the light source's divergence not meeting the required angle. Furthermore, the divergence angles of existing light sources generally range from 70° to 130°, which falls short of the design requirements. Even designing a single light source would be difficult to achieve such a demanding effect.

[0061] Therefore, the design concept of the detection unit 1 of the present invention is that one light-emitting part 12 corresponds to one micro-imaging structure 11. When multiple detection units 1 are set, the micro-imaging structures 11 can be appropriately overlapped as needed to prevent missed detection. Local areas of the light-emitting part 12 can overlap, and the heat dissipation light after the overlap will not be overexposed. Therefore, a single detection unit simultaneously satisfies X>L and the illumination range of the light-emitting part 12 is not less than the field of view range of the micro-imaging structure 11. This design concept does not require a high angle of divergence of the light-emitting part 12 and is easier to implement, so that it can adapt to the irregular shape of the enamel inner tank and prevent mirror reflected light from entering the micro-imaging structure, thereby avoiding overexposed areas and achieving matching with existing accessories on the market without generating reflected light.

[0062] Based on the above considerations, a micro-imaging structure 11 is set perpendicular to the central axis of the enamel inner pot and facing the inner wall of the inner pot. In order to prevent the mirror reflected light from entering the micro-imaging structure, the light source should illuminate the micro-imaging structure 11 from above, below or side, so that the light emitted by the light-emitting part 12 toward the micro-imaging structure 11 is set at an angle.

[0063] Specifically, there is a certain distance between the light-emitting portion 12 and the micro-imaging structure 11. Based on the design requirements that the illumination range of the light-emitting portion 12 is not less than the field of view of the micro-imaging structure 11 and X>L, it is necessary to ensure that the projection of the micro-imaging structure 11 falls within the illumination range of the light-emitting portion 12. Therefore, when installing and setting, the light-emitting portion 12 is tilted toward the direction of the micro-imaging structure 11 to meet the design requirements. Based on the tilted placement of the light-emitting portion 12, the boundary line of the divergence angle of the light-emitting portion 12 in the direction away from the micro-imaging device 11 (refer to Figure 2 The line segment between Q and Q2 in the figure forms an angle θ with the inner wall of the enamel inner container. The angle θ can be used to constrain and confirm the specific installation angle of the light-emitting portion 12. The specific value of θ needs to satisfy θ=tan^(-1)[d / (X-0.5L)]. That is, after the numerical design of X and L is confirmed, θ can be naturally derived according to this formula, so that the placement position and installation angle of the light-emitting portion 12 can be determined. By associating θ with d and X, the light emitted by the micro-imaging structure 11 can be constrained according to the distance between the micro-imaging structure 11 and the inner wall of the enamel inner container and the distance between the light-emitting portion 12 and the micro-imaging structure 11. Specifically, in actual application, the boundary line of the divergence angle is virtual and difficult to identify, but the divergence angle of different types of light sources has a certain specification. Therefore, in installation, θ can be identified as: the overall inclination angle β of the light-emitting part 12 relative to the horizontal plane + 1 / 2 divergence angle, so that after its value is determined according to the formula θ=tan^(-1)[d / (X-0.5L)], the installation inclination angle of the light-emitting part equivalent to the central axis of the enamel inner tank can be reversed.

[0064] Furthermore, the enamel liner detection device also includes a base having a placement area for placing the enamel liner to be detected; the detection unit 1 is movably mounted on the base and is arranged corresponding to the placement area so as to have an active state and a docked state during the movement process. In the docked state, the detection unit 1 is located inside the enamel liner and is fixedly arranged. In the active state, the detection unit 1 can move along the axial direction of the enamel liner. The base serves as an installation base to facilitate the positioning of the enamel liner. Through the movable adjustment of the detection unit, the number of detection units can be reduced, so that they can gradually cover the entire enamel liner through movement.

[0065] To ensure the alignment of the light-emitting portion 12 and the micro-imaging structure 11 in the detection unit 1, the detection assembly further includes a bracket (not shown). The bracket is movably mounted on the base along the axial direction of the enamel liner. The light-emitting portion 12 and the micro-imaging structure 11 of the detection unit 1 are spaced apart on the bracket. The bracket can be driven and controlled by a corresponding lifting mechanism, thereby driving the light-emitting portion 12 and the micro-imaging structure 11 to move synchronously. During the scanning process of the enamel liner, the bracket should correspond to the centerline of the ceramic liner.

[0066] Furthermore, the field of view of a single micro-imaging structure 11 is typically unable to cover the entire inner wall of the enamel container. Therefore, a bracket is provided to be rotatably mounted along the axial axis of the enamel container. This rotation of the bracket allows the detection unit 1 to adjust the illumination angle, thereby enabling comprehensive scanning of the enamel container through the coordinated movement and rotation of the bracket.

[0067] It should be understood, however, that the present invention does not limit the driving structure of the bracket. For example, the detection unit 1 can be sent into the interior of the enamel tank by combining a telescopic mechanism and a rotary motor, and the bracket can be driven by the rotary motor to perform 360° shooting.

[0068] It should be noted that the field of view coverage of micro-imaging structures 11 with different structures is different. Therefore, multiple docking points can be set, and the multiple docking points are evenly arranged in the vertical direction, so that there are multiple docking positions during the activity of the detection unit 11.

[0069] In order to complete the full inspection of the inner surface of the enamel liner without any blind spots, multiple detection units 1 are set up to cooperate with each other to ensure the detection coverage area.

[0070] To examine the bottom of the enamel pot, due to differences in space and shape, the bracket consists of a main body and multiple extension arms at the ends of the main body. These extension arms are designed to correspond to the bottom of the enamel pot, with adjacent extension arms arranged at an angle. Detection units 1 are installed on both the main body and the multiple extension arms. This allows the micro-imaging structure 11 to capture the center and two sides of the pot bottom, while the corresponding light-emitting unit can be located on the axis of the enamel pot to illuminate the side walls.

[0071] In some embodiments, due to the limited position of the light source and the unfavorable elliptical shape of the enamel liner bottom, specular reflections can easily enter the endoscope, resulting in overexposed areas. Therefore, the area directly illuminated by the light-emitting portion 12 on the enamel liner bottom may not cover the field of view of the micro-imaging structure 11; the micro-imaging structure 11 uses light from the light source after multiple reflections and scattering from the inner wall of the liner.

[0072] In some embodiments, multiple detection units 1 are provided, and the multiple detection units 1 are arranged in the vertical direction. It should be understood that the fields of view of the multiple micro-imaging structures 11 are arranged in the vertical direction. Ideally, the fields of view of the multiple micro-imaging structures 11 are adjacent to each other, so that they can just cover a certain area of the enamel inner container without any interruption. In this embodiment, the fields of view of each two adjacent micro-imaging structures 11 overlap, thereby ensuring that there are no blind spots when detecting the designated area.

[0073] When arranging multiple detection units 1, each detection unit 1 needs to ensure the above-mentioned layout principles, but the positions of multiple light-emitting parts 12 can be reasonably set according to size requirements, that is, the light emitted by the light-emitting parts 12 can cross to make the overall size of the detection component smaller.

[0074] In some embodiments, please refer to Figure 3 The plurality of detection units 1 includes two first detection units 1. Within the two first detection units 1, two micro-imaging structures 11 are adjacently arranged. Two light-emitting portions 12 are disposed on opposite sides of the two micro-imaging structures 11, facing away from each other. The light emitted by the two light-emitting portions 12 is tilted toward each other. At this point, the light emitted by the two light-emitting portions 12 intersects, meaning that the light-emitting portion 12 in one detection unit 1 is adjacent to the micro-imaging structure 11 in the other detection unit 1, facilitating a compact design. Specifically, line segment PQ = line segment Q'P' = X, line segment Q'P = line segment P'Q < X, line segment P1P2 = line segment P1'P2' = L, line segment P1P2 < X, line segment P1P2 > line segment P1P1'. After the values of X and L are confirmed by simulation, θ can be calculated based on the formula θ = tan^(-1)[d / (X-0.5L)]. The inclination angle β of the overall installation of the light-emitting part is θ-1 / 2, the divergence angle of the light-emitting part 12, so that the position and installation angle of each component can be determined.

[0075] In another embodiment, please refer to Figure 5 , the detection component includes a bracket corresponding to the detection unit 1, the bracket is movably mounted on the base in the up and down directions, and a plurality of detection units 1 are arranged along the circumferential detection of the bracket. In this embodiment, the micro-imaging structure 11 and the light-emitting portion 12 in each detection unit 1 are arranged in the up and down directions, so the multiple detection units 1 do not affect each other when arranged circumferentially, and are independent of each other. The multiple detection units 1 cooperate with each other to realize the scanning of the circumferential wall surface within a certain height range of the corresponding enamel inner tank. What is difficult to understand is that the fields of view of each two adjacent micro-imaging structures 11 have overlapping layouts, thereby ensuring that there are no blind spots when detecting the designated area.

[0076] Based on the above embodiment, the bracket only needs to be able to move in the up and down directions.

[0077] In another embodiment, in the plurality of detection units 1 , a fitting gap is formed between two adjacent micro-imaging structures 11 , and at least a portion of the light-emitting portion 12 is located in the fitting gap. Figure 4 In the embodiment, three detection units 1 are provided, and three micro-imaging structures 11 define two corresponding fitting gaps. Two light-emitting portions 12 are located in the two fitting gaps, and their illumination directions intersect. Another light-emitting portion 12 is located at the outermost side and has the same illumination direction as one of the light-emitting portions 12. That is, the plurality of detection units 1 are arranged from top to bottom in the following order: the micro-imaging structure 11 of the first detection unit, the light-emitting portion 12 of the third detection unit, the micro-imaging structure 11 of the second detection unit, the light-emitting portion 12 of the first detection unit, the micro-imaging structure 11 of the third detection unit, and the light-emitting portion 12 of the second detection unit. In other words, adjacent micro-imaging structures 11 and light-emitting portions 12 do not belong to the same detection unit 1. This arrangement allows for a reasonable combination of multiple detection units 1 within a minimal range, thereby facilitating a miniaturized structural design. It also prevents the corresponding light-emitting portion 12 from remaining outside the enamel inner container after the micro-imaging structure 11 enters the enamel inner container and being unable to illuminate. Conversely, if the corresponding micro-imaging structures 11 are too far apart after the light source enters the enamel inner container, the base of the enamel inner container cannot be scanned. Specifically, line segment PQ = line segment Q'P' = line segment Q"P" = X, line segment PQ" < X, line segment Q"P' < X, line segment P1P2 = line segment P1'P2' = line segment P1"P2" = L, line segment P1P2 < X, line segment P1P2 > line segment P1P1'. After the values of X and L are confirmed by simulation, θ can be calculated based on the formula θ = tan^(-1)[d / (X-0.5L)]. The inclination angle β of the overall installation of the light-emitting part = θ-1 / 2 the divergence angle of the light-emitting part 12, so that the position and installation angle of each component can be determined.

[0078] It should be noted that the base can be a separately set structure, and the enamel liner is transferred to the base for fixed inspection. The base can also be formed by a part of the machine of the enamel liner processing production line, so that the inspection process is directly integrated into the entire ceramic liner production line.

[0079] Specifically, the control device of the enamel liner detection device may include a processing device (such as a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM) or the program loaded from the storage device to the random access memory (RAM). Various programs and data required for the operation of the control device are also stored in the RAM. The processing device, ROM and RAM are connected to each other through a bus. The input / output (I / O) interface is also connected to the bus. Generally, the following systems can be connected to the I / O interface: input devices such as touch screens, touchpads, keyboards, mice, image sensors, microphones, accelerometers, gyroscopes, etc.; output devices such as liquid crystal displays (LCDs), speakers, vibrators, etc.; storage devices such as magnetic tapes, hard disks, etc.; and communication devices. The communication device can allow the control device to communicate with other devices wirelessly or by wire to exchange data.

[0080] Based on this, the embodiment of the present application provides a detection method for an enamel liner detection device. Figure 7 This is a flow chart of the first embodiment of the detection method of the enamel liner detection device of the present application.

[0081] In this embodiment, the detection method of the enamel liner detection device specifically includes the following steps:

[0082] Step S10, obtaining information of the enamel liner to be tested and building an enamel liner model;

[0083] It should be noted that, based on the constraint relationship between X and θ, the information of the enamel liner to be inspected can be obtained through the micro-imaging system, thereby performing simulation.

[0084] Step S20: confirming the layout strategy of the detection components based on the inner tank model, wherein the layout strategy includes the number and arrangement positions of the micro-imaging structures 11 and the light-emitting parts 12;

[0085] Comprehensively consider the relevant parameters of the light-emitting part 12 and the micro-imaging structure 11, including the field of view, visual field, divergence angle, etc., by analyzing the internal optical imaging model of the enamel inner tank, and through optical modeling and ray tracing, etc., several combinations of the light-emitting part 12 and the micro-imaging structure 11 are obtained. Then, the actual application environment and the matching driving equipment are comprehensively considered to finally confirm the layout strategy.

[0086] In the first layout strategy, the number of detection units 1 arranged in the vertical direction is appropriately set so that the entire longitudinal section of the enamel liner can be completely scanned at once, and then the bracket is rotated one circle around the longitudinal axis to scan and obtain a complete image of the liner. In the second layout strategy, the detection units 1 are appropriately arranged in the circumferential direction so that the cross section of the liner can be completely scanned, and then the device is moved from top to bottom along the longitudinal axis to scan and obtain a complete image of the liner.

[0087] It should be understood that in the design process of the layout strategy, the combination cost and light source utilization should also be considered.

[0088] Step S30, after the detection component is placed according to the layout strategy, the detection component is controlled to extend into the enamel liner to be detected, and the detection component is controlled to move out after staying for a preset time;

[0089] It should be noted that, corresponding to the first layout strategy, the preset duration consists of two stages. The timing starts after the detection part is controlled to be extended to the specified position. The timing of the first stage is completed after staying for a period of time, and the timing is paused. The detection component is driven to rotate 180° and then the timing continues to start the second stage. The detection component is removed only after the timing of the two stages is completed.

[0090] Corresponding to the second layout strategy, the preset duration is determined by the total duration based on the number of set stop points. After each stop, the detection component only detects data within a certain height range of the enamel inner tank. The detection component will be removed only after completing the detection of the entire height of the enamel inner tank.

[0091] Step S40: acquiring imaging information of the plurality of micro-imaging structures 11 to confirm the detection result of the enamel liner.

[0092] It should be noted that for the inspection results of the enamel liner, the imaging information obtained by the scanning inspection needs to be compared with the stored data of qualified or defective products to determine whether the current enamel liner has appearance defects and the level of the appearance defects.

[0093] The technical solution of the present invention has a certain constrained relationship between the distance between the light-emitting part 12 and the micro-imaging structure 11 and the inclination angle of the light irradiated by the light-emitting part 12. Therefore, through the confirmation of relevant designs through simulation analysis and comprehensive consideration of space utilization, cost, light source utilization, etc., the minimum distortion imaging and non-reflective detection component are finally obtained, thereby realizing high-precision detection of the inner tank appearance.

[0094] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's description and drawings, or direct / indirect applications in other related technical fields, within the scope of the present invention are included in the patent protection scope of the present invention.

Claims

1. A enamel liner detection device, characterized in that: The enamel liner detection device includes at least one detection unit, which is used to extend from the opening of the enamel liner into the interior of the enamel liner. The detection unit includes a micro-imaging structure and a light-emitting portion arranged at intervals, and the illumination range of the light-emitting portion is not less than the field of view range of the micro-imaging structure; The distance between the light emitting portion and the micro-imaging structure is X, and X is set to be greater than L, where L is the projection length of the long side of the field of view of the micro-imaging structure on the enamel inner container.

2. The enamel liner detection device according to claim 1, characterized in that: The light-emitting portion is arranged to be inclined toward the direction of the micro-imaging structure. In the direction away from the micro-imaging device, the angle θ formed by the boundary line of the divergence angle of the light-emitting portion and the inner wall of the enamel liner needs to satisfy θ=tan^(-1)[d / (X-0.5L)], where d is the distance between the micro-imaging structure and the inner wall surface of the enamel liner.

3. The enamel liner detection device according to claim 1, characterized in that: The light emitting portion includes a point light source.

4. The enamel liner detection device according to claim 1, characterized in that: The enamel liner detection device further includes a base having a placement area for placing the enamel liner to be detected; The detection unit is movably mounted on the base and is arranged corresponding to the placement area so as to have an active state and a docked state during the movement process. In the docked state, the detection unit is located inside the enamel inner pot and is fixedly arranged. In the active state, the detection unit can move along the axial direction of the enamel inner pot.

5. The enamel liner detection device according to claim 1 or 4, characterized in that: The enamel liner detection device further includes a bracket, which is movably installed along the axial direction of the enamel liner; The light emitting portion and the micro imaging structure of the detection unit are arranged on the bracket at intervals.

6. The enamel liner detection device according to claim 4, characterized in that: The bracket is rotatably mounted along an axis extending axially of the enamel inner container; and / or, The bracket includes a main body and multiple extension arms arranged at the end of the main body. The multiple extension arms are used to correspond to the bottom of the enamel inner pot. Two adjacent extension arms are arranged at an angle. The detection unit is provided on the main body and the multiple extension arms.

7. The enamel liner detection device according to claim 1, characterized in that: There are multiple detection units, and the multiple detection units include two first detection units. In the two first detection units, the two micro-imaging structures are arranged adjacent to each other, and the two light-emitting parts are arranged on both sides of the two micro-imaging structures facing away from each other, and the light emitted by the two light-emitting parts is inclined in the direction of approaching each other.

8. The enamel liner detection device according to claim 6, characterized in that: The enamel liner detection device includes a bracket; The plurality of detection units are arranged along the circumference of the bracket.

9. The enamel liner detection device according to claim 6, characterized in that: In the plurality of detection units, a fitting gap is formed between two adjacent micro-imaging structures, and at least part of the light-emitting portion is located in the fitting gap.

10. A detection method for an enamel liner detection device, based on the enamel liner detection device according to any one of claims 1 to 9, characterized in that: The enamel liner detection device includes multiple detection units, and the detection method of the enamel liner detection device includes the following steps: Obtain information about the enamel liner to be tested and build a liner model; Determining a layout strategy of the detection components based on the inner liner model, wherein the layout strategy includes the number and arrangement positions of the micro-imaging structures and the light-emitting parts; After the detection component is placed according to the arrangement strategy, the detection component is controlled to extend into the enamel liner to be detected, and the detection component is controlled to move out after staying there for a preset time; Imaging information of the plurality of micro-imaging structures is obtained to confirm the detection result of the enamel liner.

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