A general-purpose color sorter camera calibration fixture

Abstract

This utility model discloses a universal color sorter camera calibration fixture, specifically relating to the field of mechanical technology. It includes a fixture body with a slide rail on top and a nozzle plate on the bottom. A support plate is installed on one side of the fixture body, with two limiting posts on the side of the support plate near the nozzle plate and a cross-slot screw assembly on the other side. A reference white film and a distinguishing strip are installed in the middle of the fixture body, with the distinguishing strip located on both sides of the reference white film. Equally spaced insertion holes are provided on both sides of the top of the fixture body, with limiting pins and open retaining rings inside the insertion holes. This utility model achieves flexible adaptation to different specifications of slide rail peak and valley dimensions by using adjustable limiting pins and open retaining rings in conjunction with evenly distributed inner grooves on the inner side of the slide rail. Simultaneously, the distinguishing strip is used to adjust the camera's white balance, the reference white film to calibrate the focal length, and the camera consistency is adjusted through the holes in the fixture body.

Description

Technical Field

[0001] This utility model relates to the field of mechanical technology, and in particular to a general-purpose color sorter camera calibration fixture. Background Technology

[0002] As the core hardware module of the image processing system in a color sorter, the camera unit's performance and the scientific nature of its parameter configuration directly determine the accuracy with which the equipment captures the optical features of materials. This unit uses a high-resolution industrial camera to acquire real-time images of the surface of materials moving at high speeds. Combined with a precise optical system and intelligent supplementary lighting device, it constructs the basic data chain for the color sorter to identify foreign objects. Parameter adjustment involves multi-dimensional control of pixel resolution, frame rate synchronization, exposure compensation, and white balance correction. Millisecond-level errors in exposure time can lead to the loss of features in dark-colored materials, while improper dynamic range settings can cause overexposure of highly reflective materials. Especially for agricultural material sorting scenarios, the camera unit needs to adapt to the identification requirements of minute color differences (ΔE<3) in grain particles. Its parameter optimization is directly related to sorting accuracy indicators—such as the control of defective product rejection rate and carry-out ratio. Modern intelligent color sorters achieve dynamic parameter calibration through adaptive algorithms, which can compensate for interference factors such as material flow rate fluctuations (±15%) and changes in ambient light (500-10000 lux) in real time, ensuring the stability of RGB / HSV color space modeling. This precise control capability enables the equipment to accurately distinguish subtle differences such as moldy particles (chromaticity value Δb>5) and discolored particles (L* value deviation>10), thereby ensuring quality control standards in industries such as food processing and mineral screening.

[0003] The inventors have discovered at least the following problems in the prior art:

[0004] The existing camera fixtures are designed for one machine and one use. Different sizes of slides and chutes require different fixtures. However, as equipment is upgraded, color sorters are becoming more and more powerful and complex. The specific fixtures bring great inconvenience to production and debugging.

[0005] Therefore, a universal, multi-scenario camera calibration method is needed, and a universal tooling suitable for different specifications of slides needs to be developed. Utility Model Content

[0006] The purpose of this invention is to provide a universal color sorter camera calibration fixture to solve the problem of low versatility and inconvenience in use of existing technologies.

[0007] To solve the above-mentioned technical problems, the basic technical solution proposed by this utility model is as follows:

[0008] A universal color sorter camera calibration fixture includes a fixture body, a slide rail on the top of the fixture body, a nozzle plate on the bottom of the fixture body, a support plate on one side of the fixture body, two limiting posts on the side of the support plate near the nozzle plate, a cross-slot screw assembly on the other side of the support plate, a reference white film and a distinguishing strip installed in the middle of the fixture body, the distinguishing strip being located on both sides of the reference white film, and equidistant insertion holes on both sides of the top of the fixture body, with limiting pins and open retaining rings installed inside the insertion holes.

[0009] Preferably, the tooling body has two holes of different sizes on the side of the distinguishing strip away from the reference white film.

[0010] Preferably, the slide rail has evenly distributed inner grooves on the side near the tooling body.

[0011] Preferably, the end of the limiting pin away from the slide is engaged by the open retaining ring.

[0012] Preferably, the reference white film is located at the center of the field of view of the color sorter camera.

[0013] Preferably, the cross-slot screw assembly includes a cross-slot bolt and a washer, and the limiting post is fixedly connected to the end of the cross-slot bolt.

[0014] Preferably, the distinguishing stripes are alternating black and white stripes or grayscale gradient stripes.

[0015] Preferably, one end of the limiting pin is located inside the inner groove.

[0016] Preferably, the opening retaining ring is located on one side of the tooling body.

[0017] The beneficial effects of this utility model are:

[0018] I. This utility model, by setting an adjustable limiting pin and an open retaining ring, combined with the evenly distributed inner grooves on the inner side of the slide, can flexibly adapt to the peak and valley size differences of different specifications of slides. This reduces the number of tooling specifications, avoids the repeated development costs caused by equipment upgrades, and improves the versatility and installation efficiency of the tooling.

[0019] Second, by using the combination of the limiting pin and the open retaining ring, this utility model can improve versatility by adjusting the position of the limiting pin inserted into different insertion holes.

[0020] Third, this utility model adjusts the camera's white balance by setting a resolution bar and adjusts the camera's focal length by using a reference white film. It also adjusts the camera's consistency by using holes on the main body of the tooling, thus eliminating the need to replace the main body of the tooling. This allows for further adaptation to different slides and improves versatility. Attached Figure Description

[0021] Figure 1 This is an overall perspective view of Embodiment 1 of the present utility model;

[0022] Figure 2 This is a front view of the tooling body according to Embodiment 1 of this utility model;

[0023] Figure 3 This is a schematic diagram of the main body of the tooling according to Embodiment 1 of this utility model;

[0024] Figure 4 This is a schematic diagram of the limiting pin and the open retaining ring in Embodiment 1 of this utility model.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Tooling body; 11. Insertion hole; 2. Identification strip; 3. Reference white sheet; 4. Limiting post; 5. Support plate; 6. Cross-slot screw assembly; 7. Limiting pin; 8. Open retaining ring; 9. Nozzle plate; 10. Slide rail; 101. Inner slide groove. Detailed Implementation

[0027] Please refer to the following. Figures 1 to 4 As shown, the technical solutions in the embodiments of this utility model are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0028] It should be noted that, in the embodiments of this utility model, the directions shown in the accompanying drawings shall prevail, such as front and back. Figure 1 For the sake of accuracy, the specific details should be as follows: Figure 1 The left side is the front. Figure 1 The right side is the rear; at the same time, as Figure 2 As shown, the horizontal direction is roughly defined as left and right, and the vertical direction is defined as up and down. If a specific orientation changes, the directional indication will also change accordingly.

[0029] This utility model provides a universal color sorter camera calibration fixture, including a fixture body 1, a slide rail 10 on the upper part of the fixture body 1, a nozzle plate 9 on the lower part of the fixture body 1, a support plate 5 installed on the lower side of one side of the fixture body 1, two limiting posts 4 on the side of the support plate 5 near the nozzle plate 9, a cross-slot screw assembly 6 on the other side of the support plate 5, a reference white film 3 and a distinguishing strip 2 installed in the middle of the fixture body 1, the distinguishing strip 2 being located on both sides of the reference white film 3, and equidistant insertion holes 11 on both sides of the upper part of the fixture body 1, with limiting pins 7 and opening retaining rings 8 inside the insertion holes 11;

[0030] The main body of the tooling 1 serves as the core load-bearing structure of the tooling, providing a basic frame and installation platform. The slide 10 and the nozzle plate 9 are both core components in the existing color sorter, respectively undertaking the functions of material transmission and sorting.

[0031] In a further embodiment, the tooling body 1 has two holes of different sizes on the side of the distinguishing strip 2 away from the reference white film 3.

[0032] In this embodiment, the pitch angle and horizontal position of the camera can be finely adjusted by selecting different hole positions, ensuring the consistency of parameters of multiple cameras or different batches of tooling.

[0033] In a further embodiment, the slide 10 has an inner slide groove 101 evenly distributed on the side of the tooling body 1, and one end of the limiting pin 7 is located inside the inner slide groove 101.

[0034] In this embodiment, the other side of the slide 10 is a slide groove for sliding materials, while the inner slide groove 101 is a slide groove for cooperating with the limiting pin 7.

[0035] In a further embodiment, the end of the limiting pin 7 away from the slide rail 10 is engaged by the open retaining ring 8, and the open retaining ring 8 is located on one side of the tooling body 1.

[0036] In this embodiment, one end of the limiting pin 7 is a cone with an arc head, and the other end has a groove, so that the opening retaining ring 8 can be engaged.

[0037] In a further embodiment, the reference white film 3 is located at the center of the field of view of the color sorter camera.

[0038] In this embodiment, the reference white film 3 is a white plane with standard reflectivity.

[0039] In a further embodiment, the cross-slot screw assembly 6 includes a cross-slot bolt and a washer, with a limiting post 4 fixedly connected to the end of the cross-slot bolt.

[0040] In this embodiment, the support plate 5 and the tooling body 1 are also connected to each other by the cross-slot bolts of the cross-slot screw assembly 6.

[0041] In a further embodiment, the distinguishing stripe 2 is a black and white alternating or gray-scale gradient stripe pattern.

[0042] In this embodiment, after the camera acquires the image of the discrimination bar 2, it analyzes its grayscale value or color distribution, automatically corrects the RGB channel gain, and eliminates color deviation caused by light source color temperature deviation or sensor sensitivity difference.

[0043] The working principle of this utility model is as follows:

[0044] When the main body of the tooling needs to be installed, the corresponding insertion hole 11 can be selected according to the inner groove 101 on one side of the slide rail 10, and the two limit pins 7 are inserted into the insertion hole 11 so that the arc-shaped cone of one end of the limit pin 7 is inserted between the two inner grooves 101. Then, the open retaining ring 8 is inserted from one side of the main body of the tooling into the other end of the limit pin 7 so that the limit pin 7 is positioned. By switching the positions of the limit pin 7 and the open retaining ring 8, the slide rail 10 is matched, thereby compensating for the difference in peak and valley dimensions of the inner groove 101, covering and adapting to various specifications of slide rail 10, reducing the number of tooling specifications, improving versatility and installation convenience, thereby improving installation efficiency.

[0045] The tooling body 1 is placed on top of the nozzle plate 9 and is positioned with the nozzle plate 9 by the limiting post 4 and the support plate 5 on one side of the tooling body 1, thereby ensuring that the tooling body 1 is perpendicular to the extension line of the camera lens and focal length, thus providing a stable base and adapting to different slide mounting surfaces.

[0046] The reference white film 3 is a white plane with standard reflectivity, placed at the center of the camera's field of view. The camera uses an autofocus algorithm or manual fine-tuning to ensure that the reference white film 3 achieves a clear image, such as sharp edges without ghosting. At this point, the focus is locked. The planar characteristics of the reference white film 3 can eliminate focus shift caused by slide tilt or curved surfaces, ensuring consistent image clarity for materials. The resolution strip 2 is a black and white alternating or gray-gradient stripe pattern, providing a known color reference. After the camera acquires the image of the resolution strip 2, it analyzes its grayscale value or color distribution, automatically corrects the RGB channel gain, and eliminates color shift caused by light source color temperature deviation or sensor sensitivity differences. Therefore, after assembly, the focus can be adjusted by using the reference white film 3 in conjunction with the camera, and the white balance can be reset by using the resolution strip 2 in conjunction with the camera. This allows for adjustment of camera consistency without replacing the main tooling 1, thus further adapting to different slides 10 and improving versatility.

[0047] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A universal color sorter camera calibration fixture, comprising a fixture body (1), characterized in that, A slide rail (10) is provided above the main body of the tooling (1), a nozzle plate (9) is provided below the main body of the tooling (1), a support plate (5) is installed on the lower side of one side of the main body of the tooling (1), two limiting posts (4) are provided on the side of the support plate (5) near the nozzle plate (9), and a cross-slot screw assembly (6) is provided on the other side of the support plate (5). A reference white sheet (3) and a distinguishing strip (2) are installed in the middle of the main body of the tooling (1), and the distinguishing strip (2) is located on both sides of the reference white sheet (3). Equally spaced insertion holes (11) are opened on both sides above the main body of the tooling (1), and a limiting pin (7) and an opening retaining ring (8) are provided inside the insertion hole (11).

2. The universal color sorter camera calibration tool of claim 1, wherein: The tooling body (1) has two holes of different sizes on the side of the distinguishing strip (2) away from the reference white film (3).

3. The universal color sorter camera correction tool of claim 1, wherein: The slide (10) has evenly distributed inner grooves (101) on the side near the tooling body (1).

4. The universal color sorter camera correction tool of claim 1, wherein: The end of the limiting pin (7) away from the slide (10) is engaged by the opening retaining ring (8).

5. The universal color sorter camera correction tool of claim 1, wherein: The reference white film (3) is located at the center of the field of view of the color sorter camera.

6. The universal color sorter camera correction tool of claim 1, wherein: The cross-slot screw assembly (6) includes a cross-slot bolt and a washer, and the limiting post (4) is fixedly connected to the end of the cross-slot bolt.

7. The universal color sorter camera correction tool of claim 1, wherein: The distinguishing stripe (2) is a black and white stripe pattern or a gray gradient stripe pattern.

8. The universal color sorter camera correction tool of claim 1, wherein: One end of the limiting pin (7) is located inside the inner groove (101).

9. The universal color sorter camera correction tool of claim 1, wherein: The opening retaining ring (8) is located on one side of the tooling body (1).

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