Calibration board system with dustproof function

Abstract

The technical scheme of the utility model provides a calibration plate system with a dustproof function, and the system comprises a calibration plate which is fixedly arranged and is provided with a calibration surface for calibration of a visual sensor; the dustproof plate is movably arranged; in the calibration operation state, the dustproof plate is located at the first working position, and at the moment, the calibration surface is exposed out of the calibration plate; and in the non-calibration operation state, the dustproof plate is located at the second working position, and at the moment, the dustproof plate covers the calibration surface of the calibration plate. According to the calibration plate system with the dustproof function, dustproof covering of the calibration plate is achieved through the movably-arranged dustproof plate, normal calibration use is guaranteed, the calibration face can be prevented from being exposed to the dust environment, and the problem that the calibration function of the calibration face possibly fails due to dust accumulation is solved.

Description

Technical Field

[0001] This application relates to the field of measurement system calibration technology, specifically to a calibration plate system with dustproof function. Background Technology

[0002] Flexible vision measurement systems are already being used in industrial manufacturing. Solutions such as those from Hexagon, which utilize structured light sensors mounted on robots, are already being applied in flexible manufacturing sectors like automotive. A typical industrial vision measurement system mainly includes motion components, sensor terminals, and a host computer system. Additionally, calibration boards and other auxiliary equipment are often included in such systems.

[0003] Taking structured light sensors as an example, to ensure the accuracy of the sensor when scanning the surface of a part, it is usually necessary to perform periodic calibration. Based on the calibration results, the internal parameters of the system are reset to eliminate accumulated errors from long-term use. For structured light sensors, the sensor parameters can be calibrated using a flat surface with a preset pattern. Typically, for ease of operation, the calibration board is placed within the system, installed in an unoccupied corner during layout to avoid interference with moving components and the sensor terminal.

[0004] However, in most industries within the industrial manufacturing sector, industrial vision measurement systems are largely deployed along production lines, where the on-site working environment is quite complex, with a large amount of dust and other particulate matter permeating the air. Under such conditions, surfaces such as calibration boards accumulate significant dust within a few working days, obscuring alignment patterns or reflective labels. When the obscuring is severe, the sensor cannot perform the required calibration function. Utility Model Content

[0005] To improve the reliability of calibration plates in field environments and reduce temporary maintenance interruptions caused by surface dust accumulation, this application provides a calibration plate system with dustproof function.

[0006] This application provides a calibration plate system with dustproof function, including:

[0007] A calibration plate is fixedly installed and has a calibration surface for use in calibrating the vision sensor.

[0008] The dust cover is movable; in the calibration operation state, the dust cover is in the first working position, at which time the calibration surface is exposed outside the calibration plate; in the non-calibration operation state, the dust cover is in the second working position, at which time the dust cover covers the calibration surface of the calibration plate.

[0009] Preferably, the dustproof plate is slidably disposed above the calibration plate.

[0010] Preferably, the dustproof plate and the calibration plate are disposed without contacting each other.

[0011] Preferably, the dustproof plate is disposed on the sliding joint, and the sliding joint is disposed parallel to the calibration surface.

[0012] Preferably, a base plate is included, which covers the lower surface of the dustproof plate when the dustproof plate is in the second working position.

[0013] Preferably, it includes a skirt, which is located between the calibration plate and the dustproof plate, and the skirt is arranged around the outer edge of the dustproof plate.

[0014] Preferably, it further includes a base, the base having a fixed base and a first support and a second support arranged in series with the base; the base and the first support, as well as the first support and the second support, are all rotatably adjustable.

[0015] Preferably, the base and the first support are rotatably arranged around the first connecting shaft, and one of the base and the first support is provided with a first arc-shaped groove concentric with the first connecting shaft; the other is provided with a first fixing member that can be locked in the first arc-shaped groove;

[0016] The first support base and the second support base are rotatably arranged around the second connecting shaft. One of the first support base and the second support base is provided with a second arc-shaped groove concentric with the second connecting shaft; the other is provided with a second fixing member that can be locked in the second arc-shaped groove.

[0017] The first connecting shaft and the second connecting shaft are perpendicular to each other.

[0018] Preferably, the device includes a support arm for supporting a dustproof plate disposed on one side edge of the calibration plate; the dustproof plate is movable on the support arm; one end of a swing arm is rotatably disposed about a fixed point, and the other end is rotatably connected to the dustproof plate to drive the dustproof plate to slide along the support arm; the dustproof plate is held on the support arm by gravity.

[0019] The dustproof calibration plate system of this application maintains the positional accuracy of the calibration plate by keeping it fixed during operation, as the calibration plate is permanently positioned. Simultaneously, the movable dustproof plate provides dust protection, ensuring normal calibration while preventing the calibration surface from being exposed to a dusty environment, thus avoiding potential calibration failure due to dust accumulation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the dustproof calibration plate system of this application;

[0021] Figure 2 This is a schematic diagram of a structure of an embodiment of the dustproof calibration plate system of this application;

[0022] Figure 3 This is a schematic diagram of a structure of an embodiment of the dustproof calibration plate system of this application;

[0023] Figure 4 This is a schematic diagram of another embodiment of the calibration plate system with dustproof function of this application.

[0024] In the picture:

[0025] 1: Calibration plate system; 11: Calibration plate; 11S: Calibration surface; 12: Dustproof plate; 121: Moving pair; 122: Linear drive device; 123: Skirt; 13: Base plate; 14: Dustproof cover; 141: Valve; 2: Base; 21: Base; 22: First support seat; 221: First connecting shaft; 222: First arc groove; 23: Second support seat; 231: Second connecting shaft; 232: Second arc groove; 31: Support arm; 32: Swing arm; S1: First working position; S2: Second working position. Detailed Implementation

[0026] The technical solution of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. In this specification, the dimensions of the drawings do not represent the actual size ratio. The drawings are only used to illustrate the relative positional relationship and connection relationship between the components. Components with the same name or the same reference numeral represent similar or the same structure, and are limited to illustrative purposes.

[0027] Figure 1 This is a schematic diagram of the calibration plate system of this application. The calibration plate system 1 of this application includes at least a calibration plate 11 for calibrating a vision sensor. As is common in the prior art, the calibration plate 11 typically has a calibration surface 11S, on which corresponding calibration patterns or reflective labels used for calibration are formed. Commonly used calibration surfaces 11S in the prior art are those with a black and white checkerboard pattern or dot-matrix reflective labels. Higher-order calibration surfaces may also include other forms of patterns, such as QR codes encoding location information. As examples, the calibration surface 11S in this application can refer to prior art such as Chinese Utility Model Patent Publication No. CN221650950U and Chinese Invention Patent Publication No. CN118328902A.

[0028] To avoid dust accumulation on the calibration plate 11 when it is installed as part of the industrial vision measurement system in the workshop, the calibration plate system 1 also includes a movable dustproof plate 12. When the calibration plate 11 is not in a calibration state, the dustproof plate 12 covers the calibration surface 11S of the calibration plate 11, preventing the calibration surface 11S from being exposed to a dusty environment. The movable arrangement of the dustproof plate 12 allows it to retract from the surface of the calibration surface 11S during calibration operations, ensuring that the vision sensor can normally complete image acquisition from the surface of the calibration surface 11S and achieve the calibration task. In fact, for the calibration plate system 1, it is preferable to fix the calibration plate 11 and movable the dustproof plate 12, the purpose of which is to ensure that the position coordinates of the calibration plate 11 remain stable and provide a reliable calibration reference.

[0029] The dustproof plate 12 slides into or away from the top of the calibration plate 11. Its structure is as follows: Figure 2 As shown, the dustproof plate 12 does not contact the calibration surface 11S during its movable setting. The dustproof plate 12 is mounted on a sliding joint 121, which is parallel to and slightly higher than the calibration surface 11S. The sliding joint 121 can be self-powered or simply used to guide the movement of the dustproof plate 12. Figure 2 In the case where 121 only serves a guiding function, a linear drive device 122 is also provided parallel to the guiding direction of the sliding pair 121, driving the dust cover 12 along that direction. As shown in the figure, the linear drive device 122 can be a cylinder, a ball screw, or other drive components with the same linear drive function. One reason for the movable arrangement of the dust cover 12 is to reduce interference with the sensor calibration process. Since the robotic arm carrying the sensor will return to the calibration surface 11S along a certain path to achieve calibration, if the dust cover 12 is held above the calibration surface 11S in a certain state during calibration, there may be a potential risk of collision between the dust cover 12 and moving components such as the robotic arm. Therefore, the above technical solution of this application does not adopt a scheme where the dust cover 12 is set to flip up and open.

[0030] exist Figure 2In this embodiment, the calibration plate 11 is fixed to the base 2, and the dustproof plate 12 moves under the guidance of the sliding joint 121, having a first working position S1 and a second working position S2. In the first working position S1, the dustproof plate 12 is located on the upper surface of the calibration plate 11, covering the calibration surface 11S of the upper surface of the calibration plate 11. In the second working position S2, the dustproof plate 12 is completely retracted from the upper surface of the calibration plate 11, exposing the upper surface of the calibration plate 11. At the second working position S2, a base plate 13 is preferably provided on the lower surface of the dustproof plate 12, such that the base plate 13 completely covers the lower surface of the dustproof plate 12. The base plate 13 can be independently provided or integrated into the base 2, for example, formed using the surface of the base 2. Figure 2 In this embodiment, a metal plate slightly larger than the dustproof plate 12 is additionally mounted on the surface of the base 2 as a base plate 13. Furthermore, when the dustproof plate 12 is in the first working position S1, it is preferably not supported by the calibration plate 11; that is, when the dustproof plate 12 is located on the upper surface of the calibration plate 11, it should preferably be suspended above the calibration plate 11. From a force perspective, there is almost no interaction force between the dustproof plate 12 and the calibration plate 11. Since the dustproof plate 12 and the calibration plate 11 do not contact each other, the weight of the dustproof plate 12 and the driving torque generated by the external force during its movement will not act on the calibration plate 11. This effectively maintains the stability of the calibration plate 11's posture over long periods, reducing the frequency of repeated calibration of the calibration plate 11.

[0031] In the above technical solution, for the dustproof plate 12, its lower surface specifically refers to the surface facing the calibration surface 11S. This actually depends on the installation state of the calibration plate 11. Therefore, "upper" or "lower" does not represent a precise directional limitation, but is merely a convenient designation given in this embodiment because the calibration plate 11 is basically arranged in a vertical direction. On the other hand, in the above embodiment, the reason for requiring the calibration plate 11 to be fixed while the dustproof plate 12 is movable is to ensure the positional stability of the calibration plate 11, that is, to ensure that the positioning of the calibration plate 11 remains unchanged during long-term use, thus eliminating the need for frequent calibration of the calibration plate 11. In fact, the calibration plate 11 can be configured to be movable to achieve dustproof treatment of the calibration plate 11. That is, in the non-calibration state, the calibration plate 11 can be housed in a specific dustproof space, and only moved out of the dustproof space when calibration is required. While similar solutions can achieve dustproof effects, the instability of the calibration plate 11 due to its movement is detrimental to achieving high repeatability in sensor calibration. Therefore, in the above-mentioned technical solution of this application, we require that the calibration plate 11 be relatively fixed, and the switching between dustproof and calibration is achieved by moving the dustproof plate 12. In a further embodiment, since the dustproof plate 12 and the calibration plate 11 do not contact each other to ensure the stability of the calibration plate 11, a skirt 123 for sealing and dustproofing can be provided between the calibration plate 11 and the dustproof plate 12 to ensure the dustproof effect. The skirt 123 is generally a soft material that surrounds the outer edge of the dustproof plate 12, and it can be soft rubber or a densely flocked or piled edge. A dustproof cover 14 is usually also provided at the second working position S2. When the dustproof plate 12 is in the second working position S2, the dustproof cover 14 covers the upper layer of the dustproof plate 12 to cover the surface of the dustproof plate 12. Preferably, the dust cover 14 is configured to be movable entirely or partially, allowing it to be removed entirely or partially from above the dust cover 12 to facilitate maintenance or cleaning of the dust cover 12. Regarding the dust cover 14, Figure 2 The embodiment provides a technical solution of opening in the dust cover 14 and providing an openable and closable door 141 at the opening.

[0032] The base 2 has a base 21 fixed to a support such as the ground, and a first support 22 and a second support 23 sequentially connected above the base 21. The base 21 and the first support 22, as well as the first support 22 and the second support 23, are adjustable and typically locked after adjustment to ensure the positional accuracy of the calibration plate 11. Specifically, the connection between the base 21 and the first support 22 is rotatably mounted around a first connecting shaft 221, which can be a fixing pin, a rotating shaft, or a fixing bolt. A first arc-shaped groove 222 concentric with the first connecting shaft 221 is provided on the base 21 or one of the bases 21, and a fixing element, such as a fixing bolt, is provided on the other of the first support 22 or the base 21 that can be locked within the first arc-shaped groove 222. When adjusted to a suitable angle, the fixing element is locked to complete the fixation between the base 21 and the first support 22. The fixing element preferably has a quick-release handle to facilitate tool-free locking and unlocking. Similarly, the first support 22 and the second support 23 are rotatably mounted around the second connecting shaft 231 and can be locked in either position. Typically, a second arc-shaped groove 232 concentric with the second connecting shaft 231 is provided on either the second support 23 or the first support 22. The second arc-shaped groove 232 is also locked in place by a fastener on either the second support 23 or the first support 22, allowing for angle adjustment between the two. Figure 3 In one embodiment, the first connecting shaft 221 and the second connecting shaft 231 are perpendicular to each other to achieve arbitrary matching of the calibration plate 11 within a certain range.

[0033] Figure 3 In another embodiment of the calibration plate system 1, the movement mode of the base 2 is optimized to further reduce the footprint of the calibration plate system 1, especially the space occupied on the parallel ground. To reduce the space occupied by the calibration plate system 1, the dustproof plate 12 is not slidably installed, so the second working position S2 is not located on the side of the calibration plate 11 and parallel to the calibration plate 11, but is relatively vertically positioned on one side of the calibration plate 11, thereby reducing the horizontal area occupied.

[0034] Specifically Figure 3This is a side view of the mechanism. On the calibration plate system 1, a support arm 31 for supporting a dustproof plate 12 is located at one edge of the calibration plate 11. It can be understood that the support arm 31 can be formed on two sides of the calibration plate 11, inside and outside the plane shown in the figure, to support the support arm 31. The dustproof plate 12 should be able to move on the support arm 31 to exit or enter the calibration surface 11S. The support arm 31 can be fixedly or rotatably mounted on the calibration plate 11, for example, as a rotating assembly with bearings rotatably mounted on the calibration plate 11. In this case, when the dustproof plate 12 moves, there is relative rolling between the dustproof plate 12 and the support arm 31, resulting in smoother operation. One end of a swing arm 32 is rotatably mounted on the calibration plate 11 about a fixed axis, and the other end is rotatably connected to the dustproof plate 12 to push the dustproof plate 12 to slide on the support arm 31. The swing arm 32 is preferably rotatably connected to the edge of the dustproof plate 12 away from the support arm 31 when the dustproof plate 12 is in the first working position S1, so as to maximize the position of the dustproof plate 12 in the second working position S2 below the calibration plate 11. When the swing arm 32 swings to the side of the support arm 31, the dustproof plate 12 is vertical under the gravity of the support arm 31 on the other side of the dustproof plate 12, so that the position of the second working position S2 is generally below one side of the dustproof plate 12. The dustproof plate 12 is generally inclined in the vertical plane or in a completely vertical state according to the dimensional fit between the swing arm 32 and the support arm 31.

[0035] The above description is merely a preferred embodiment of this application and is not intended to limit the scope of this application. Any modifications and improvements made by those skilled in the art to the technical solutions of this application without departing from the spirit of this application shall fall within the protection scope defined by the claims of this application.

Claims

1. A calibration plate system with dustproof function, characterized in that, include: A calibration plate (11) is fixedly installed and has a calibration surface (11S) for use in calibrating the vision sensor. Dustproof plate (12) is movable; in the calibration operation state, the dustproof plate (12) is in the first working position (S1), at which time the calibration surface (11S) is exposed outside the calibration plate (11); in the non-calibration operation state, the dustproof plate (12) is in the second working position (S2), at which time the dustproof plate (12) covers the calibration surface (11S) of the calibration plate (11).

2. The calibration plate system with dustproof function as described in claim 1, characterized in that, The dustproof plate (12) is slidably disposed above the calibration plate (11).

3. The calibration plate system with dustproof function as described in claim 2, characterized in that, The dustproof plate (12) and the calibration plate (11) are arranged without contact with each other.

4. The calibration plate system with dustproof function as described in claim 2, characterized in that, The dustproof plate (12) is disposed on the movable pair (121), which is parallel to the calibration surface (11S).

5. The calibration plate system with dustproof function as described in claim 1, characterized in that, Includes a base plate (13), which covers the lower surface of the dustproof plate (12) when the dustproof plate (12) is in the second working position (S2).

6. The calibration plate system with dustproof function as described in claim 1, characterized in that, Includes a skirt (123), which is located between the calibration plate (11) and the dustproof plate (12), and the skirt (123) is arranged around the outer edge of the dustproof plate (12).

7. The calibration plate system with dustproof function as described in claim 1, characterized in that, It also includes a base (2), which has a fixed base (21) and a first support (22) and a second support (23) connected in series with the base (21); the base (21) and the first support (22) and the first support (22) and the second support (23) are both rotatably adjustable.

8. The calibration plate system with dustproof function as described in claim 7, characterized in that, The base (21) and the first support (22) are rotatably arranged around the first connecting shaft (221). One of the base (21) and the first support (22) is provided with a first arc-shaped groove (222) concentric with the first connecting shaft (221); the other is provided with a first fixing member that can be locked in the first arc-shaped groove (222). The first support base (22) and the second support base (23) are rotatably arranged around the second connecting shaft (231). One of the first support base (22) and the second support base (23) is provided with a second arc-shaped groove (232) concentric with the second connecting shaft (231); the other is provided with a second fixing member that can be locked in the second arc-shaped groove (232). The first connecting shaft (221) is perpendicular to the second connecting shaft (231).

9. The calibration plate system with dustproof function as described in claim 1, characterized in that, The device includes a support arm (31) for supporting a dustproof plate (12) located on one side edge of a calibration plate (11); the dustproof plate (12) is movable on the support arm (31); one end of a swing arm (32) is rotatably disposed about a fixed point, and the other end is rotatably connected to the dustproof plate (12) to drive the dustproof plate (12) to slide along the support arm (31); the dustproof plate (12) is held on the support arm (31) by gravity.

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