A calibration plate position adjustment device

Abstract

The utility model discloses a kind of calibration plate position adjusting device, including base and adjusting base, adjusting base bottom is fixed with hemisphere, base top is equipped with the hemispherical recess of containing hemisphere. Limiting protrusion is equipped in the opposite sides of base, adjusting base is located therebetween, and its side wall is opened with long and narrow transverse recess. Horizontal limiting pin shaft and horizontal rotation adjusting bolt are all equipped on the limiting protrusion of two sides, limiting pin shaft is inserted into recess and forms movable limit. Adjusting base other two sides are fixed on base by vertical rotation adjusting bolt, and the bolt hole diameter thereof is greater than bolt rod diameter. Adjusting base and base are equipped with damping spring on vertical rotation adjusting bolt. Base four corners are also equipped with auxiliary fixing bolt located below adjusting base, and adjusting base four corners are opened with corresponding adjusting port. The utility model is compact in structure, can realize horizontal rotation around fixed ball core and vertical rotation around determined axis, approximately decouples, adjusting precision is high, stability is good, and is suitable for narrow space.

Description

Technical Field

[0001] This utility model relates to the field of position adjustment components, specifically a calibration plate position adjustment device. Background Technology

[0002] Visual calibration establishes a precise relationship between camera image pixel coordinates and 3D world coordinates using a calibration board with a known pattern, in order to correct lens distortion and calculate camera parameters and spatial pose. The calibration board adjustment device is used to fix and precisely adjust the spatial position and orientation of the calibration board. Early calibration work often relied on manual hand-held calibration boards, which suffered from poor stability, low accuracy, low efficiency, and fatigue. Therefore, adjustment devices that could stably support the calibration board and allow flexible adjustment of its spatial pose gradually developed. From the initial single height or angle adjustment, it evolved into multi-degree-of-freedom coordinated adjustment of height, angle, and horizontal position to meet complex calibration posture requirements.

[0003] Currently, most existing adjustment devices are multi-axis (such as two-axis, three-axis, four-axis, five-axis, and six-axis) adjustment mechanisms. A common drawback is that these mechanisms are often stacked designs, with each degree of freedom coupled to the others, making decoupled adjustment impossible. For example, adjusting one degree of freedom (such as horizontal rotation) will also change other degrees of freedom (such as spatial tilt), requiring repeated calibration and resulting in low efficiency. Furthermore, the stacked design leads to bulky devices that occupy a lot of space, making them difficult to integrate into confined spaces (such as inside precision instruments or small devices), increasing integration difficulty and cost. Those skilled in the art often adapt their own solutions to fit existing adjustment mechanisms, but this does not make the device compact, stable, and simple; instead, it increases additional cost and complexity.

[0004] Therefore, there is an urgent need for a compact adjustment device that can achieve micro-coupling adjustment, is low in cost, and is suitable for use in confined spaces. Utility Model Content

[0005] The purpose of this invention is to provide a calibration plate position adjustment device to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a calibration plate position adjustment device, including a base and an adjustment base. A hemisphere is fixed in the center of the bottom of the adjustment base, and a hemispherical groove for accommodating the movement of the hemisphere is opened in the center of the top of the base. Limiting protrusions are provided on opposite sides of the base. The adjustment base is located between the two limiting protrusions. A narrow horizontal groove is opened on the side wall of the adjustment base on the same side as the limiting protrusions. Horizontally distributed limiting pins and horizontal rotating adjusting bolts are threaded onto the limiting protrusions on both sides. The ends of the limiting pins are inserted into the narrow horizontal grooves to form a movable limiting on the adjustment base. The ends of the horizontal rotating adjusting bolts are in close contact with the side wall of the adjustment base. The other two sides of the adjustment base are fixed to the top surface of the base by vertically distributed vertical rotating adjusting bolts, and the bolt holes on the adjustment base are larger than the diameter of the vertical rotating adjusting bolts. A damping spring is provided between the adjustment base and the base, and the damping spring is sleeved on the vertical rotating adjusting bolt.

[0007] Furthermore, the four corners of the base are vertically threaded with auxiliary fixing bolts, all of which are located below the adjusting base. The four corners of the adjusting base are provided with adjustment openings, which are located above the auxiliary fixing bolts.

[0008] Furthermore, the diameter of the screw portion of the auxiliary fixing bolt is smaller than the diameter of the adjustment port, and the outer diameter of the head or nut of the auxiliary fixing bolt is larger than the diameter of the adjustment port.

[0009] Furthermore, the limiting protrusions on both sides of the base are perpendicular to the top surface of the base.

[0010] Furthermore, the length direction of the elongated horizontal groove is parallel to the side edge of the side wall of the adjustment base where it is located.

[0011] Furthermore, the object of adjustment is a calibration plate or a horizontal standard plate.

[0012] Compared with the prior art, the beneficial effects of this utility model are: I. This utility model uses the cooperation of a hemisphere and a limiting pin with a narrow groove to make the adjusting base rotate around a fixed sphere center, ensuring that the center position of the object being adjusted remains unchanged during horizontal rotation, thereby improving the adjustment accuracy and stability.

[0013] Second, the adjustment structures of this utility model are all arranged in the same plane, eliminating the need for multiple layers of mechanisms. Since the horizontal rotation is around a fixed sphere center, while the vertical rotation is around an axis determined by the hemisphere center and the limiting pin, the instantaneous centers of the two rotational movements are spatially separated. This achieves approximately decoupled adjustment in the structure, effectively reducing repeated calibrations and improving efficiency.

[0014] Third, this utility model has a compact and small structure, making it suitable for use in confined spaces. It has low manufacturing costs and is easy to integrate into various types of equipment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the disassembled structure of this utility model; In the diagram: 1. Base; 2. Adjustable base; 3. Hemisphere; 4. Limit pin; 5. Damping spring; 6. Horizontal rotation adjustment bolt; 7. Auxiliary fixing bolt; 8. Vertical rotation adjustment bolt; 9. Adjustment object. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Implementation, for example Figure 1-2 As shown, this embodiment provides a calibration plate position adjustment device, including a base 1 and an adjustment base 2. A hemisphere 3 is fixed in the center of the bottom of the adjustment base 2, and a hemispherical groove for accommodating the movement of the hemisphere 3 is formed in the center of the top of the base 1. The base 1 has limiting protrusions perpendicular to the top surface of the base 1 on opposite sides. The adjustment base 2 is located between the two limiting protrusions. A narrow, horizontally placed groove is formed on the side wall of the adjustment base 2 on the same side as the limiting protrusions. Horizontally distributed limiting pins 4 and horizontally rotating adjusting bolts 6 are threaded onto both limiting protrusions. The ends of the limiting pins are inserted into the narrow, horizontally placed groove to form a support for the adjustment base 2. The adjustable base 2 features a movable limit switch, with the end of the horizontally rotating adjusting bolt 6 tightly abutting the side wall of the adjusting base 2. The other two sides of the adjusting base 2 are fixed to the top surface of the base 1 by vertically distributed vertically rotating adjusting bolts 8, with the bolt holes on the adjusting base 2 having a diameter larger than that of the vertically rotating adjusting bolts 8. A damping spring 5 is provided between the adjusting base 2 and the base 1, and the damping spring 5 is sleeved on the vertically rotating adjusting bolts 8. Auxiliary fixing bolts 7 are also vertically threaded at the four corners of the base 1, all located below the adjusting base 2. Adjustment openings are provided through the four corners of the adjusting base 2, located above the auxiliary fixing bolts 7. Furthermore, the adjustment object 9 is a calibration plate or a horizontal standard plate.

[0018] In use, the adjustable object 9 can be rotated horizontally along center A, or vertically along central axis B, or both can be performed simultaneously. (1) Horizontal rotation along center A: Loosen the auxiliary fixing bolts 7 at the four corners downwards, so that their tops are no longer in contact with the bottom surface of the adjusting base 2 or only slightly in contact, to release space for the rotation of the adjusting base 2. The horizontal rotation adjusting bolt 6 on one side actively screws in to provide driving force, while the horizontal rotation adjusting bolt 6 on the other side passively provides moderate constraint and retracts accordingly. The end of the bolt on the screwed-in side pushes the side wall of the adjusting base 2, so that it relies on the hemisphere 3 at the bottom to rotate horizontally around the center of the hemisphere (center A) within a small range (e.g., ±10°). The limiting pin 4 slides in the narrow horizontal groove, serving as a guide and limiting function. The bolt on the loosened side provides it with room to move. After the horizontal rotation is in place, tighten the horizontal rotation adjusting bolts 6 on both sides, so that their ends press against the side wall of the adjusting base 2 to achieve main fixation. Then, tighten the four auxiliary fixing bolts 7 upwards, so that their tops firmly contact and support the bottom surface of the adjusting base 2, providing auxiliary fixation and enhancing overall rigidity.

[0019] (2) Vertical rotation along the central axis B: Unscrew the horizontal rotation adjustment bolts 6 on both sides outward to release their pressure on the side wall of the adjustment base 2. Screw the auxiliary fixing bolts 7 at the four corners to the bottom to leave enough vertical rotation space for the tilt of the adjustment base 2. Unscrew the vertical rotation adjustment bolt 8 on one side upward, and simultaneously screw the vertical rotation adjustment bolt 8 on the other side downward. At this time, under the push and traction of the bolts, the adjustment base 2 will rotate vertically (pitch) around the central axis B within a small range (e.g., ±10°) by relying on the fulcrum of the hemisphere 3 and the constraint of the limiting pin 4. During this process, the damping spring 5 sleeved on the vertical rotation adjustment bolt 8 is compressed or released, which plays a role in buffering and stabilizing the adjustment process, realizing stepless and smooth adjustment. After the vertical rotation is in place, tighten the vertical rotation adjustment bolts 8 on both sides to achieve main fixation by using the preload of the bolts. Then, adjust the height of the four auxiliary fixing bolts 7 upwards in sequence so that their tops can all make stable contact with the inclined bottom surface of the adjusting base 2, thereby sharing the load and enhancing the reliability of the fixation.

[0020] It should be noted that the diameter of the screw portion of the auxiliary fixing bolt 7 is smaller than the aperture of the adjustment port, and the outer diameter of its head and / or nut is larger than the aperture of the adjustment port. This structure ensures that the adjustment port can still fully expose the auxiliary fixing bolt 7 after the adjustment base 2 is rotated horizontally, thus ensuring that it can always be adjusted.

[0021] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A calibration plate position adjustment device, characterized in that: The base includes a base (1) and an adjusting base (2). A hemisphere (3) is fixed at the center of the bottom of the adjusting base (2). A hemispherical groove for accommodating the movement of the hemisphere (3) is provided at the center of the top of the base (1). The base (1) has limiting protrusions on opposite sides. The adjusting base (2) is located between the two limiting protrusions. A narrow horizontal groove is provided on the side wall of the adjusting base (2) on the same side as the limiting protrusions. Horizontally distributed limiting pins (4) and horizontally rotating adjusting bolts (6) are threaded onto the limiting protrusions on both sides. The end is inserted into the narrow horizontal groove to form a movable limit on the adjustment base (2). The end of the horizontal rotating adjustment bolt (6) is close to the side wall of the adjustment base (2). The other two sides of the adjustment base (2) are fixed to the top surface of the base (1) by vertically distributed vertical rotating adjustment bolts (8). The bolt holes on the adjustment base (2) are larger than the diameter of the vertical rotating adjustment bolts (8). A damping spring (5) is provided between the adjustment base (2) and the base (1). The damping spring (5) is sleeved on the vertical rotating adjustment bolt (8).

2. The calibration plate position adjustment device according to claim 1, characterized in that: The base (1) is also vertically threaded with auxiliary fixing bolts (7) at its four corners. The auxiliary fixing bolts (7) are all located below the adjusting base (2). The adjusting base (2) has adjustment ports through its four corners, and the adjustment ports are located above the auxiliary fixing bolts (7).

3. The calibration plate position adjustment device according to claim 2, characterized in that: The diameter of the screw portion of the auxiliary fixing bolt (7) is smaller than the diameter of the adjustment port, and the outer diameter of the head or nut of the auxiliary fixing bolt (7) is larger than the diameter of the adjustment port.

4. The calibration plate position adjustment device according to claim 1, characterized in that: The limiting protrusions on both sides of the base (1) are perpendicular to the top surface of the base (1).

5. The calibration plate position adjustment device according to claim 1, characterized in that: The length of the narrow horizontal groove is parallel to the side of the side wall of the adjustment base (2) where it is located.

6. The calibration plate position adjustment device according to claim 1, characterized in that: It also includes an adjustment object (9), which is a calibration plate or a horizontal standard plate.

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