An ADC internal reference calibration tool

Abstract

The utility model discloses a kind of ADC inner parameter calibration tool, it is related to ADC camera tooling technical field, including bottom plate, camera support, rotating platform and limit board;The camera support is slidably connected with the bottom plate;The rotating platform is set on the bottom plate;The limit board is set on the rotating platform;At least one long slot is opened in the bottom plate, and the long slot extends along the transverse direction of the bottom plate;Bolt is respectively threaded in the two sides of the camera support, and the bolt is slidably matched with the long slot.The utility model solves the problem of inaccurate point, poor consistency and high time cost when existing manual clamping calibration board is used to calibrate ADC camera inner parameter, and auxiliary ADC camera efficiently and accurately completes inner parameter calibration.

Description

Technical Field

[0001] This utility model relates to the field of ADC camera tooling technology, specifically to an ADC intrinsic parameter calibration tooling. Background Technology

[0002] In the ADC camera intrinsic parameter calibration process, six calibration board points need to be photographed from different angles to complete the calibration. In existing solutions, this process relies entirely on manual hand-holding of the calibration board, manually placing it in the corresponding position and then photographing it one by one. The existing solutions have the following drawbacks: inaccurate shooting points: manual hand-holding makes it difficult to ensure that the position and angle of the calibration board perfectly meet the calibration requirements each time, easily leading to point deviations; poor consistency: when different operators or the same operator performs multiple operations, the placement accuracy of the calibration board varies greatly, resulting in low repeatability of calibration results; high time cost: manually adjusting the position and angle of the calibration board requires repeated calibration, resulting in low operational efficiency, especially in batch calibration scenarios where the time consumption problem is more prominent. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an ADC intrinsic parameter calibration fixture to solve the problems of inaccurate positioning, poor consistency and high time cost in the existing manual clamping calibration board for ADC camera intrinsic parameter calibration, and to assist the ADC camera in completing the intrinsic parameter calibration efficiently and accurately.

[0004] To solve the above problems, the technical solution provided by this utility model is as follows:

[0005] An ADC intrinsic parameter calibration fixture includes a base plate, a camera bracket, a rotating platform, and a limiting plate; the camera bracket is slidably connected to the base plate; the rotating platform is disposed on the base plate; the limiting plate is disposed on the rotating platform; the base plate has at least one long slot extending laterally along the base plate; bolts are respectively inserted on both sides of the camera bracket, and the bolts are slidably engaged with the long slot.

[0006] The sliding connection between the camera bracket and the base plate allows for flexible adjustment of the distance between the camera and the calibration plate. The rotating platform and limiting plate provide a mounting base for the calibration plate with precise rotation angles. Overall, this solves the problems of inaccurate positioning and poor consistency caused by manual hand-held calibration, providing a physical basis for accurate and repeatable calibration.

[0007] Optionally, the rotating platform includes a shaft fixing seat, a rotating shaft, a deep groove ball bearing, a bearing fixing seat, and a platform plate; the shaft fixing seat is bolted to the base plate; the rotating shaft has an annular step, and the deep groove ball bearing is sleeved on the step of the rotating shaft; the platform plate is sleeved on the rotating shaft, and the platform plate abuts against the outer ring of the deep groove ball bearing; the bearing fixing seat is bolted to the platform plate, and the bearing fixing seat covers the outside of the deep groove ball bearing.

[0008] The shaft mounting base and bearing mounting base together ensure the stable installation of the shaft and bearing system; the use of deep groove ball bearings greatly reduces rotational friction and wobbling, ensuring that the platform plate can rotate smoothly and accurately to the required angle and remain stable, which is the key to achieving high-precision angle positioning.

[0009] Optionally, the rotating shaft and the platform plate are connected by a key or welded together.

[0010] To ensure that there is no relative slippage or free rotation between the platform plate and the shaft when the rotating platform is rotating, thus achieving effective torque transmission and guaranteeing the directness and accuracy of angle adjustment.

[0011] Optionally, two deep groove ball bearings are provided, and the two deep groove ball bearings are distributed at an axial interval along the shaft.

[0012] The rigidity and stability of the rotating platform are improved, preventing the platform from overturning or swaying under stress. The dual-bearing support forms a stable structure where "two points determine a straight line," significantly enhancing the platform's ability to resist lateral moments.

[0013] Optionally, the shaft fixing seat is cylindrical with a flange at its bottom; the flange has at least two connecting holes, through which bolts are threaded to the base plate.

[0014] A stable, reliable, and easy-to-install base is provided for securing the rotating shaft assembly. The cylindrical structure houses and positions the shaft and bearings, while the bottom flange provides a large and stable mounting surface, ensuring the entire rotary platform assembly can be securely mounted on the base plate.

[0015] Optionally, the base plate, camera bracket, platform plate of the rotating platform, and limiting plate are all made of aluminum alloy or stainless steel.

[0016] The tooling must have sufficient structural strength and rigidity while being lightweight, and possess good corrosion resistance and durability to adapt to long-term use in industrial environments.

[0017] Optionally, the platform plate of the rotating platform is provided with at least one right-angle code and at least one 45° angle code; both the right-angle code and the 45° angle code are bolted to the platform plate; the limiting plate is bolted to the right-angle code and the 45° angle code respectively.

[0018] A flexible and modular angle positioning method is provided, which enables the limiting plate (and the calibration plate on it) to be quickly and accurately fixed at different preset angles (such as 90° and 45°), greatly improving calibration efficiency and ensuring the consistency of angles.

[0019] Optionally, two right-angle codes are provided, symmetrically distributed on one side of the platform plate; two 45° angle codes are provided, symmetrically distributed on the other side of the platform plate.

[0020] Symmetrical arrangement of corner brackets. Their function is to optimize the force distribution on the limiting plate, improving installation stability and balance. The symmetrical design prevents torsional deformation that may occur due to unilateral fixing, ensuring that the calibration plate plane remains parallel to or at a preset angle to the axis of rotation.

[0021] Optionally, the limiting plate has at least two threaded holes, each of which is fitted with a fastening bolt, and the end of the fastening bolt is attached with a rubber pad.

[0022] The calibration plate is clamped securely, reliably, and without damage. The fastening bolts provide clamping force, while the rubber pads at the ends provide protection and prevent slippage.

[0023] Optionally, the camera bracket has a U-shaped structure, with its opening facing the rotating platform, and its top is provided with mounting holes or a clamping structure.

[0024] The U-shaped structure provides an open mounting space, facilitating the insertion, adjustment, and removal of the camera. The mounting holes or clamping structures at the top are used to directly secure the camera or mount additional camera adjustment heads, ensuring compatibility with different camera mounting methods.

[0025] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0026] The technical solution provided by this utility model achieves precise and rapid positioning of the distance and angle between the calibration plate and the camera through a sliding and adjustable camera bracket and a rotating platform with precision bearings. Its modular angle code design enables efficient and repeatable accurate reproduction of the six required calibration angles, completely solving the problems of positional deviation, poor consistency, and low operational efficiency caused by manual hand-held operation, significantly improving calibration accuracy and efficiency. Attached Figure Description

[0027] Figure 1 A schematic diagram of the structure of an ADC intrinsic parameter calibration fixture proposed for an embodiment of this utility model;

[0028] Figure 2 A bottom view of a rotating platform for an ADC intrinsic parameter calibration fixture proposed in an embodiment of this utility model;

[0029] Figure 3 An isometric view of a rotary platform for an ADC intrinsic parameter calibration fixture proposed in an embodiment of this utility model;

[0030] Figure 4 A top view of an ADC intrinsic parameter calibration fixture proposed for an embodiment of this utility model;

[0031] 1. Camera bracket; 2. Base plate; 3. Rotating platform; 301. Shaft fixing seat; 302. Rotating shaft; 303. Bearing fixing seat; 304. Right angle bracket; 305. 45° angle bracket; 4. Limiting plate; 5. Long groove; 6. Fastening bolt; 7. Deep groove ball bearing; 8. Platform plate. Detailed Implementation

[0032] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0033] Example 1

[0034] Combined with appendix Figure 1 , 4 An ADC intrinsic parameter calibration fixture includes a base plate 2, a camera bracket 1, a rotating platform 3, and a limiting plate 4; the camera bracket 1 is slidably connected to the base plate 2; the rotating platform 3 is disposed on the base plate 2; the limiting plate 4 is disposed on the rotating platform 3; at least one long slot 5 is provided on the base plate 2, and the long slot 5 extends laterally along the base plate 2; bolts are respectively provided on both sides of the camera bracket 1, and the bolts are slidably engaged with the long slot 5.

[0035] The device operates based on mechanical adjustment and positioning. The base plate 2 serves as the installation foundation for the entire fixture. Operators loosen the bolts on both sides of the camera bracket 1, allowing it to slide laterally along the long slot 5 on the base plate 2, thus coarsely adjusting the relative distance between the camera and the calibration plate. After adjustment, the bolts are tightened to ensure consistency in the calibration distance for each measurement. The calibration plate is fixed to the limiting plate 4, which is mounted on the rotating platform 3. The rotation of the rotating platform 3 precisely changes the angle of the calibration plate relative to the camera, thereby efficiently and accurately switching between six different calibration points.

[0036] Combined with appendix Figure 2 , 3The rotating platform 3 includes a shaft fixing seat 301, a rotating shaft 302, a deep groove ball bearing 7, a bearing fixing seat 303, and a platform plate 8. The shaft fixing seat 301 is connected to the base plate 2 by bolts. The rotating shaft 302 is provided with an annular step, and the deep groove ball bearing 7 is sleeved on the step of the rotating shaft 302. The platform plate 8 is sleeved on the rotating shaft 302, and the platform plate 8 abuts against the outer ring of the deep groove ball bearing 7. The bearing fixing seat 303 is connected to the platform plate 8 by bolts, and the bearing fixing seat 303 covers the outside of the deep groove ball bearing 7.

[0037] The rotating platform 3 operates on the classic bearing-supported rotation structure. The rotating shaft 302 is reliably positioned and supported by its annular step and deep groove ball bearing 7. When an angle change is required, the operator applies torque to the platform plate 8 or the limiting plate 4. The platform plate 8 then drives the outer ring of the deep groove ball bearing 7 to rotate around the rotating shaft 302 (the inner ring is fixed). The bearing mounting seat 303 not only protects the bearing and prevents dust accumulation, but also, through its connection with the platform plate 8, locks the entire upper structure of the rotating platform 3 into a unified whole, ensuring rigidity and stability during rotation.

[0038] The rotating shaft 302 is connected to the platform plate 8 by a key or welding.

[0039] The rotational motion of the shaft 302 is transmitted to the platform plate 8 without delay or deviation through mechanical interlocking via keyed connections (such as flat keys or splines) or metallurgical welding. Keyed connections allow for disassembly, while welding provides permanent fixation. Both methods effectively prevent the platform plate 8 from slipping on the shaft 302, ensuring that the rotational force applied to the platform plate 8 is fully utilized to change the angle of the calibration plate.

[0040] Two deep groove ball bearings 7 are provided, and the two deep groove ball bearings 7 are distributed at intervals along the axial direction of the rotating shaft 302.

[0041] The two bearings are arranged axially spaced, which is equivalent to increasing the support points of the rotating shaft 302. This design can withstand greater torque loads (such as the eccentric force brought by the calibration plate), effectively suppressing the radial and axial movement of the rotating shaft 302 and the platform plate 8 during rotation and in the fixed state, ensuring that the platform plate 8 always rotates smoothly in a plane perpendicular to the axis of the rotating shaft 302, thereby ensuring the accuracy of the calibration plate angle.

[0042] The shaft fixing seat 301 is cylindrical and has a flange at its bottom; the flange has at least two connection holes, and bolts pass through the connection holes to be threaded to the base plate 2.

[0043] The flange is connected to the base plate 2 by multiple bolts. The preload of the bolts presses the flange firmly against the base plate 2, generating a large frictional force to resist the torsional torque of the rotating platform 3 during operation and prevent it from shifting. The design of multiple connection holes ensures the balance and robustness of the connection, providing an absolutely stable base for the entire rotational motion.

[0044] The base plate 2, camera bracket 1, platform plate 8 of rotating platform 3, and limiting plate 4 are all made of aluminum alloy or stainless steel.

[0045] Aluminum alloy, with its low density and high strength, effectively reduces the weight of the entire tooling, facilitating movement and operation; it also offers good machinability. Stainless steel, on the other hand, provides even higher strength and excellent corrosion resistance. The use of these two materials ensures the long-term accuracy stability of the tooling, preventing calibration results from being affected by rust or deformation.

[0046] The platform plate 8 of the rotating platform 3 is provided with at least one right-angle code 304 and at least one 45° angle code 305; both the right-angle code 304 and the 45° angle code 305 are connected to the platform plate 8 by bolts; the limiting plate 4 is connected to the right-angle code 304 and the 45° angle code 305 by bolts respectively.

[0047] The angle bracket itself is a standardized angle block. By fixing the right-angle bracket 304 or the 45° angle bracket 305 to the platform plate 8 with bolts, one side of them provides a precise reference surface for the limiting plate 4. When installing the limiting plate 4, by ensuring it is flush against the reference surface of the angle bracket and then fixing it with bolts, a precise 90° or 45° angle can be formed between the limiting plate 4 and the platform plate 8. Different calibration angles can be quickly switched by replacing or selecting different angle brackets.

[0048] Two right-angle codes 304 are provided, and the two right-angle codes 304 are symmetrically distributed on one side of the platform plate 8; two 45° angle codes 305 are provided, and the two 45° angle codes 305 are symmetrically distributed on the other side of the platform plate 8.

[0049] Two symmetrically distributed corner brackets provide two parallel support points for the limiting plate 4. When tightened with bolts, the clamping force is evenly distributed, avoiding stress concentration and warping of the limiting plate 4 that could be caused by single-point support. This symmetrical structure ensures that the calibration plate is firmly and flatly fixed, thereby guaranteeing the accuracy of its angle relative to the camera optical axis.

[0050] The limiting plate 4 has at least two threaded holes, and each threaded hole is fitted with a fastening bolt 6. A rubber pad is attached to the end of the fastening bolt 6.

[0051] The operator tightens the fastening bolt 6, pressing the rubber pad at its end against the edge of the calibration plate. The rubber pad increases friction through deformation, preventing the calibration plate from loosening or slipping during rotation; its soft nature also prevents direct contact between the metal bolt and the calibration plate, thus avoiding scratches or damage.

[0052] The camera bracket 1 has a U-shaped structure, with its opening facing the rotating platform 3, and its top is provided with mounting holes or clamping structures.

[0053] The U-shaped opening faces the rotating platform 3, ensuring an unobstructed view in front of the camera lens and providing a complete field of view for aligning with the calibration plate. The camera is stably suspended on the bracket via a structure at its top (such as a direct bolt connection to the screw holes at the bottom of the camera, or a clamping mechanism for locking), and, in conjunction with the sliding adjustment function, ultimately enables rapid focusing and positioning of the camera.

[0054] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. An ADC internal reference calibration tool, characterized in that, It includes a base plate (2), a camera bracket (1), a rotating platform (3), and a limiting plate (4); the camera bracket (1) is slidably connected to the base plate (2); the rotating platform (3) is disposed on the base plate (2); the limiting plate (4) is disposed on the rotating platform (3); at least one long slot (5) is provided on the base plate (2), and the long slot (5) extends laterally along the base plate (2); bolts are respectively provided on both sides of the camera bracket (1), and the bolts are slidably engaged with the long slot (5).

2. The ADC intrinsic parameter calibration fixture according to claim 1, characterized in that, The rotating platform (3) includes a shaft fixing seat (301), a rotating shaft (302), a deep groove ball bearing (7), a bearing fixing seat (303), and a platform plate (8); the shaft fixing seat (301) is connected to the base plate (2) by bolts; the rotating shaft (302) is provided with an annular step, and the deep groove ball bearing (7) is sleeved on the step of the rotating shaft (302); the platform plate (8) is sleeved on the rotating shaft (302), and the platform plate (8) abuts against the outer ring of the deep groove ball bearing (7); the bearing fixing seat (303) is connected to the platform plate (8) by bolts, and the bearing fixing seat (303) covers the outside of the deep groove ball bearing (7).

3. The ADC intrinsic parameter calibration fixture according to claim 2, characterized in that, The rotating shaft (302) and the platform plate (8) are connected by a key or welded together.

4. The ADC intrinsic parameter calibration fixture according to claim 2, characterized in that, Two deep groove ball bearings (7) are provided, and the two deep groove ball bearings (7) are distributed at an axial interval along the shaft (302).

5. The ADC intrinsic parameter calibration fixture according to claim 2, characterized in that, The shaft fixing seat (301) is cylindrical and has a flange at its bottom; the flange has at least two connecting holes, and bolts pass through the connecting holes to be threadedly connected to the base plate (2).

6. The ADC intrinsic parameter calibration fixture according to claim 2, characterized in that, The base plate (2), camera bracket (1), platform plate (8) and limiting plate (4) of the rotating platform (3) are all made of aluminum alloy or stainless steel.

7. The ADC intrinsic parameter calibration fixture according to claim 1, characterized in that, The rotating platform (3) has at least one right-angle code (304) and at least one 45° angle code (305) on its platform plate (8); the right-angle code (304) and the 45° angle code (305) are both connected to the platform plate (8) by bolts; the limiting plate (4) is connected to the right-angle code (304) and the 45° angle code (305) by bolts respectively.

8. The ADC intrinsic parameter calibration fixture according to claim 7, characterized in that, Two right-angle codes (304) are provided, and the two right-angle codes (304) are symmetrically distributed on one side of the platform plate (8); two 45° angle codes (305) are provided, and the two 45° angle codes (305) are symmetrically distributed on the other side of the platform plate (8).

9. The ADC intrinsic parameter calibration fixture according to claim 1, characterized in that, The limiting plate (4) has at least two threaded holes, and each threaded hole is fitted with a fastening bolt (6), with a rubber pad attached to the end of the fastening bolt (6).

10. The ADC intrinsic parameter calibration fixture according to claim 1, characterized in that, The camera bracket (1) has a U-shaped structure, the opening of the camera bracket (1) faces the rotating platform (3), and the top of the camera bracket (1) is provided with mounting holes or clamping structures.

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