A lightweight high-precision calibration plate structure

Abstract

The utility model discloses a portable high-precision calibration plate structure, characterized in that it includes a calibration plate bracket and a calibration plate installed on the top of the calibration plate bracket, the top of the calibration plate is provided with a hollow chamber, and the bottom surface of the hollow chamber is provided with a plurality of calibration points; a connecting component is installed at the bottom of the calibration plate bracket, and the connecting component includes a magnetic plate and a positioning pin, and the magnetic plate is fixedly installed on the calibration plate bracket; the top of the positioning pin is arranged between the magnetic plate and the calibration plate bracket, and the bottom of the positioning pin passes through the magnetic plate and is arranged below the bottom surface of the magnetic plate; a positioning notch is arranged on the side wall of the calibration plate bracket, and the positioning notch is arranged beside the positioning pin. The utility model improves the convenience of taking and placing by the staff, reduces the labor intensity of the staff, and also ensures the calibration efficiency and accuracy.

Description

Technical Field

[0001] The utility model relates to a detection field, in particular to a lightweight high-precision calibration plate structure. Background Art

[0002] In applications such as machine vision, image measurement, photogrammetry, and 3D reconstruction, calibration plates are used to correct lens distortion, determine the conversion relationship between physical size and pixels, and determine the relationship between the 3D geometric position of a point on the surface of a space object and its corresponding point in the image. This requires the establishment of a geometric model of camera imaging. The camera has a fixed-pitch pattern array plate, and after calculation by the calibration algorithm, the geometric model of the camera can be obtained, thereby obtaining high-precision measurement and reconstruction results.

[0003] In order to correct the distortion of the camera lens, scanners and other machines use cameras to photograph a calibration plate with a fixed-pitch pattern array. After calculation by the calibration algorithm, the conversion relationship between physical size and pixels is determined, and the geometric model of the camera is obtained, thereby reducing the distortion of the lens and making the image taken by the camera closer to the real object, thereby obtaining a high-precision image.

[0004] Among them, the calibration plate has multiple uses, for example, when scanning ear impressions, it is used as a three-dimensional positioning of the scanner or camera. For example, the application number is: 202321635208.1, and the patent name is: A high-precision ear impression transmission mechanism using magnet positioning.

[0005] However, the method of positioning the calibration plate using magnetic beads or magnets has the following disadvantages:

[0006] 1. Each scan requires this operation. Frequent operation will cause the magnetic beads or magnets to collide multiple times, which will weaken or disappear the magnetism. The magnetic beads or magnets are fragile, which will cause the magnetic beads or magnets to need to be replaced frequently.

[0007] 2. The calibration plate is large in size and heavy in weight, which makes it inconvenient for the staff to take it. In addition, due to its heavy weight, when the base is driven to rotate, the driving power of the motor is relatively large, and basically it needs to be driven at full load. Over time, the driving mechanism is easily damaged;

[0008] 3. The positioning speed of the calibration plate and the base is relatively low. Due to the heavy weight, the labor intensity of the staff will also be relatively high. Summary of the invention

[0009] The utility model aims to provide a lightweight high-precision calibration plate structure, by using the structure, can not only ensure the calibration speed and calibration accuracy, but also reduce the weight, and improve the convenience of connection between the calibration plate and the base.

[0010] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a lightweight high-precision calibration plate structure, including a calibration plate bracket and a calibration plate installed on the top of the calibration plate bracket, the top of the calibration plate is provided with a hollow chamber, and the bottom surface of the hollow chamber is provided with a plurality of calibration points;

[0011] A connecting component is installed at the bottom of the calibration plate bracket, and the connecting component includes a magnetic plate and a positioning pin, and the magnetic plate is fixedly installed on the calibration plate bracket;

[0012] The top of the positioning pin is arranged between the magnetic plate and the calibration plate bracket, and the bottom of the positioning pin passes through the magnetic plate and is arranged below the bottom surface of the magnetic plate;

[0013] A positioning notch is provided on the side wall of the calibration plate bracket, and the positioning notch is arranged beside the positioning pin.

[0014] In the above technical solution, a magnetic turntable is further provided, and the top of the magnetic turntable is adsorbed and connected to the bottom surface of the magnetic attraction plate;

[0015] The magnetic turntable is provided with a positioning groove matching the positioning pin, and the bottom of the positioning pin is inserted into the positioning groove.

[0016] In the above technical solution, the magnetic turntable includes a turntable and a plurality of magnetic parts arranged at the bottom of the turntable, the magnetic parts are arranged opposite to the magnetic attraction plate, the turntable is adsorbed and connected to the magnetic attraction plate via the magnetic parts, the positioning groove is arranged on the turntable, and the two ends of the positioning groove pass through the top and bottom surfaces of the turntable.

[0017] In the above technical solution, an annular groove is provided at the bottom of the rotating disk, and a plurality of magnetic members are arranged in the annular groove;

[0018] And / or, the magnetic member is a high-magnetism magnet.

[0019] In the above technical solution, a plurality of connecting holes with both ends passing through are provided in the middle of the turntable.

[0020] In the above technical solution, the calibration plate bracket and the calibration plate are made of aluminum or aluminum alloy.

[0021] In the above technical solution, the calibration plate bracket includes a vertical plate and a mounting plate, the bottom of the calibration plate is connected to the top of the mounting plate via the vertical plate, the connecting component is connected to the mounting plate, and the vertical plate is a hollow structure.

[0022] In the above technical solution, a mounting cavity is provided at the bottom of the mounting plate, the connecting component is installed in the mounting cavity, and the positioning notch is provided on the outer side wall of the mounting plate.

[0023] In the above technical solution, the magnetic attraction plate is an annular structure, and a plurality of mounting holes are provided on the magnetic attraction plate. The magnetic attraction plate is screwed and connected to the calibration plate bracket through mounting bolts passing through the corresponding mounting holes;

[0024] The magnetic plate is provided with a clearance hole, and the bottom of the positioning pin passes through the clearance hole and is arranged below the bottom surface of the magnetic plate.

[0025] In the above technical solution, the calibration points include a plurality of first calibration points and a plurality of second calibration points, and the size of the first calibration points is smaller than the size of the second calibration points.

[0026] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0027] 1. In the utility model, a hollow chamber is arranged on the calibration plate, and a calibration point is arranged on the bottom surface of the hollow chamber. The arrangement of the hollow chamber can effectively reduce the weight of the calibration plate, thereby improving the convenience of connection and disassembly of the calibration plate and the base, reducing the labor intensity of the staff, and at the same time, the calibration plate can be stably driven to rotate by the base, reducing the driving power of the driving mechanism as much as possible, and extending the service life of the driving mechanism;

[0028] 2. In the utility model, by providing a positioning pin and a magnetic suction plate, the magnetic suction plate is used to quickly connect with the magnetic turntable on the base, and the positioning pin can be quickly positioned with the positioning groove of the magnetic turntable, thereby improving the rapid and accurate positioning of the calibration plate and the base;

[0029] 3. In the utility model, a positioning notch is provided on the calibration plate bracket beside the positioning pin, so that when the calibration plate and the base are connected, they can be quickly aligned through the positioning notch, thereby improving the efficiency of installation;

[0030] 4. The calibration plate and the calibration bracket of the utility model are made of aluminum or aluminum alloy, which can effectively reduce the weight while ensuring its strength;

[0031] 5. In the utility model, the magnet is directly mounted on the bottom surface of the turntable, and it does not directly contact the calibration plate bracket, thereby effectively preventing damage to the magnet and extending its service life;

[0032] 6. In the utility model, calibration points are set on the calibration plate, and there are first calibration points and second calibration points with different diameters. This has strong practicality in applications such as image measurement and three-dimensional reconstruction, and improves the accuracy and effect of calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the structure of the first embodiment of the present utility model;

[0034] Figure 2 yes Figure 1 A schematic diagram of the structure in another viewing angle state;

[0035] Figure 3 It is an exploded view of the first embodiment of the present utility model;

[0036] Figure 4 It is a schematic diagram of the structure of the first embodiment of the utility model (the magnetic turntable is not shown);

[0037] Figure 5 yes Figure 4 Side view of

[0038] Figure 6 yes Figure 4 Rear view of.

[0039] Among them: 1. Calibration plate bracket; 2. Calibration plate; 3. Hollow chamber; 4. Magnetic plate; 5. Positioning pin; 6. Positioning notch; 7. Magnetic turntable; 8. Positioning groove; 9. Turntable; 10. Magnetic part; 11. Annular groove; 12. Connection hole; 13. Vertical plate; 14. Mounting plate; 15. Mounting hole; 16. Make way hole; 17. Pin head; 18. First calibration point; 19. Second calibration point. DETAILED DESCRIPTION

[0040] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0041] Example 1: See Figures 1 to 6 As shown, a lightweight high-precision calibration plate structure includes a calibration plate bracket 1 and a calibration plate 2 installed on the top of the calibration plate bracket 1, a hollow chamber 3 is provided on the top of the calibration plate 2, and a plurality of calibration points are provided on the bottom surface of the hollow chamber 3;

[0042] A connecting component is installed at the bottom of the calibration plate bracket 1, and the connecting component includes a magnetic suction plate 4 and a positioning pin 5. The magnetic suction plate 4 is fixedly installed on the calibration plate bracket 1;

[0043] The top of the positioning pin 5 is arranged between the magnetic plate 4 and the calibration plate bracket 1, and the bottom of the positioning pin 5 passes through the magnetic plate 4 and is arranged below the bottom surface of the magnetic plate 4;

[0044] A positioning notch 6 is provided on the side wall of the calibration plate bracket 1 , and the positioning notch 6 is arranged beside the positioning pin 5 .

[0045] In this embodiment, a hollow chamber is set on the calibration plate, and calibration points are set on the bottom surface of the hollow chamber. During the test, high-precision measurement and reconstruction results are obtained through various calibration points. Among them, the setting of the hollow chamber can reduce the weight of the calibration plate as much as possible, so that when the staff removes and puts the calibration plate from the base, it can reduce its labor intensity, making it more convenient for the staff to take and put. The calibration plate bracket is connected to the base through a connecting component. When installing, the calibration plate bracket is directly placed on the base, and the magnetic suction plate is adsorbed on the base through the magnetic material on the base, so as to realize the rapid connection and fixation of the base and the calibration plate bracket. Among them, the magnetic suction plate is made of a material that can be adsorbed by a magnetic material, such as an iron sheet. At the same time, in order to realize the circumferential position limit between the calibration plate and the base, the calibration plate can be connected to the base at a precise angle. Therefore, through the setting of the positioning pin, the positioning pin and the base can be used for positioning, so that the connection between the positioning plate and the base is connected at a predetermined and precise angle. In order to facilitate the connection between the calibration plate bracket and the base, so that the locating pin can be facing the position on the base that matches the locating pin, a locating notch is provided on the side wall of the calibration plate bracket, and the locating notch is provided next to the locating pin. In this way, the staff only needs to observe the position of the locating notch from the side of the calibration plate bracket to know the specific position of the locating pin, so that the calibration plate bracket and the base can be quickly and accurately connected (if there is no locating notch, the staff needs to first look at the locating pin from the bottom of the calibration plate bracket, and then connect it to the base, which is inconvenient to install and the alignment is inaccurate).

[0046] See also Figure 2 , 3 As shown, a magnetic turntable 7 is also provided, and the top of the magnetic turntable 7 is adsorbed and connected to the bottom surface of the magnetic attraction plate 4;

[0047] The magnetic turntable 7 is provided with a positioning groove 8 matching the positioning pin 5 , and the bottom of the positioning pin 5 is inserted into the positioning groove 8 .

[0048] In this embodiment, the magnetic turntable is directly mounted on the top surface of the base, so that when the calibration plate is connected to the base through the calibration plate bracket, the calibration plate bracket is directly placed on the base, and the magnetism of the magnetic turntable itself is used to adsorb the magnetic plate on the magnetic turntable, thereby realizing the rapid connection of the calibration plate and the calibration plate bracket and the base. At the same time, the positioning groove is set, when the calibration plate bracket and the base are connected, the positioning pin is inserted into the positioning groove, so that the calibration plate can be connected to the base at a predetermined angle. Moreover, the magnetic turntable mainly gives the magnetic plate axial suction, and the radial force and circumferential force are not very strong. Therefore, when the base drives the calibration plate and the calibration plate bracket to rotate through the magnetic turntable, the positioning pin and the positioning groove can be used for circumferential and radial limiting to ensure that when the base rotates, the calibration plate and the calibration plate bracket rotate synchronously and accurately with the base. Moreover, when the calibration plate bracket and the magnetic turntable are connected, the staff only needs to observe the position of the positioning notch to know the position of the positioning pin, so that the positioning pin can be facing the positioning groove to achieve rapid connection and positioning of the calibration plate, calibration plate bracket and base.

[0049] See also Figure 2 , 3 As shown, the magnetic turntable 7 includes a turntable 9 and a plurality of magnetic members 10 disposed at the bottom of the turntable 9, the magnetic members 10 are disposed opposite to the magnetic attraction plate 4, the turntable 9 is adsorbed and connected to the magnetic attraction plate 4 via the magnetic members 10, the positioning groove 8 is disposed on the turntable 9, and the two ends of the positioning groove 8 pass through the top and bottom surfaces of the turntable 9. The magnetic member is a high-magnetic magnet.

[0050] The high-magnetic magnet is directly installed on the bottom of the turntable, using bonding or other fixing methods. In this way, when the magnetic plate at the bottom of the calibration plate bracket is against the top surface of the turntable, the high-magnetic magnet has a strong magnetism, which will directly adsorb the magnetic plate on the top surface of the turntable, realizing the axial positioning of the magnetic plate and the turntable, and then using the positioning pins and positioning grooves for circumferential and radial positioning to prevent the magnetic plate from moving and shaking relative to the turntable.

[0051] In this embodiment, the positioning groove is arranged on the side of the turntable, and the outer side of the positioning groove is connected to the outer side wall of the turntable.

[0052] See also Figure 2 As shown, an annular groove 11 is provided at the bottom of the turntable 9 , and the annular groove 11 is arranged opposite to the magnetic attraction plate 4 , and a plurality of magnetic members 10 are distributed in the annular groove 11 .

[0053] The annular groove is set to allow the magnetic part to be installed inside the turntable without protruding below the bottom of the turntable, thereby reducing space occupation. At the same time, the distance between the magnetic part and the top surface of the turntable is smaller, making the magnetic part have a stronger suction force on the magnetic suction plate.

[0054] See also Figure 2 , 3 As shown, the middle of the turntable 9 is provided with a plurality of connection holes 12 with both ends passing therethrough. The connection holes are arranged so that the turntable can be connected to the base by passing bolts through the connection holes, thereby realizing the connection and fixation between the magnetic turntable and the base, so that when the calibration plate and the calibration plate bracket move upward and separate from the base, the magnetic turntable will not separate from the base, thereby ensuring the stability of use.

[0055] Furthermore, the calibration plate bracket and the calibration plate are made of aluminum or aluminum alloy. Preferably, the calibration plate bracket and the calibration plate are made of aluminum, which is relatively light, further reducing its weight, reducing the difficulty of taking and placing by the staff, and improving the convenience of taking and placing.

[0056] See also Figures 1 to 6 As shown, the calibration plate bracket 1 includes a vertical plate 13 and a mounting plate 14, the bottom of the calibration plate 2 is connected to the top of the mounting plate 14 via the vertical plate 13, the connecting component is connected to the mounting plate 14, and the vertical plate 13 is a hollow structure.

[0057] The bottom of the mounting plate 14 is provided with a mounting cavity, the connecting component is installed in the mounting cavity, and the positioning notch 6 is provided on the outer side wall of the mounting plate 14 .

[0058] The top surface of the vertical plate is an inclined surface, which forms an acute angle structure between the calibration plate and the bottom surface of the mounting plate. The vertical plate adopts a hollow structure, and an installation space is set at the bottom of the mounting plate, which further reduces the overall weight of the calibration plate and the calibration plate bracket, thereby reducing the difficulty of staff in taking and placing the calibration plate and improving the convenience of taking and placing.

[0059] See also Figure 3 As shown, the magnetic attraction plate 4 is an annular structure, and a plurality of mounting holes 15 are provided on the magnetic attraction plate 4. The magnetic attraction plate 4 is screwed and connected to the calibration plate bracket 1 through mounting bolts passing through the corresponding mounting holes 15;

[0060] The magnetic plate 4 is provided with a clearance hole 16 , and the bottom of the positioning pin 5 passes through the clearance hole 16 and is arranged below the bottom surface of the magnetic plate 4 .

[0061] Among them, the magnetic plate is an annular structure. When the magnetic plate is against the top surface of the magnetic turntable, the magnetic plate is directly above the annular groove of the turntable, so that the suction force generated by the magnetic part can stably and firmly adsorb the magnetic plate on the turntable. The magnetic plate is connected to the mounting plate of the calibration plate bracket through the mounting hole by the mounting bolt, and a screw hole is set on the top surface of the mounting cavity at the bottom of the mounting plate. Each screw hole is opposite to a mounting hole. The mounting bolt passes through the mounting hole and a screw hole to be screwed, so as to achieve the fixation of the magnetic plate and the mounting plate. Furthermore, the top of the locating pin has a coaxially arranged pin head 17, and the diameter of the pin head 17 is larger than the diameter of the locating pin. A hole position matching the pin head is set on the top surface of the mounting cavity. The pin head is directly placed in the hole position, and then the locating pin is passed through the clearance hole and is located below the bottom surface of the magnetic plate. The size of the clearance hole matches the diameter of the locating pin. In this way, the magnetic plate will limit the pin head to prevent the locating pin from falling downward, and then limit the axial movement of the locating pin through the magnetic plate.

[0062] See also Figure 1 , 3 As shown in FIG. 4 , the calibration points include a plurality of first calibration points 18 and a plurality of second calibration points 19 , and the size of the first calibration points 18 is smaller than the size of the second calibration points 19 .

[0063] Among them, the calibration points can be arranged on the bottom surface of the hollow chamber in a cylindrical array, or can be arranged all over the bottom surface of the hollow chamber in a rectangular array, or can be arranged in a checkerboard structure, and the diameters of the first calibration point and the second calibration point are different. This has strong practicality in applications such as image measurement and three-dimensional reconstruction, and improves the calibration speed and calibration accuracy.

[0064] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0065] In the present utility model, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection, or an integral one; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, for example, the two can form a mechanical abutment or abutment connection through abutment, contact, etc., the two can also be directly hung or hung through an intermediate medium, etc., or it can be the internal connection of the two elements or the interaction relationship between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A lightweight high-precision calibration plate structure, characterized in that: It includes a calibration plate bracket and a calibration plate installed on the top of the calibration plate bracket, the top of the calibration plate is provided with a hollow chamber, and the bottom surface of the hollow chamber is provided with a plurality of calibration points; A connecting component is installed at the bottom of the calibration plate bracket, and the connecting component includes a magnetic plate and a positioning pin, and the magnetic plate is fixedly installed on the calibration plate bracket; The top of the positioning pin is arranged between the magnetic plate and the calibration plate bracket, and the bottom of the positioning pin passes through the magnetic plate and is arranged below the bottom surface of the magnetic plate; A positioning notch is provided on the side wall of the calibration plate bracket, and the positioning notch is arranged beside the positioning pin.

2. The lightweight high-precision calibration plate structure according to claim 1 is characterized in that: A magnetic turntable is also provided, the top of which is adsorbed and connected to the bottom surface of the magnetic attraction plate; The magnetic turntable is provided with a positioning groove matching the positioning pin, and the bottom of the positioning pin is inserted into the positioning groove.

3. The lightweight high-precision calibration plate structure according to claim 2 is characterized in that: The magnetic turntable includes a turntable and a plurality of magnetic parts arranged at the bottom of the turntable, the magnetic parts are arranged opposite to the magnetic attraction plate, the turntable is adsorbed and connected to the magnetic attraction plate via the magnetic parts, the positioning groove is arranged on the turntable, and the two ends of the positioning groove pass through the top surface and the bottom surface of the turntable.

4. The portable high-precision calibration plate structure according to claim 3 is characterized in that: An annular groove is provided at the bottom of the rotating disk, and a plurality of magnetic members are arranged in the annular groove; And / or, the magnetic member is a high-magnetism magnet.

5. The portable high-precision calibration plate structure according to claim 3 is characterized in that: A plurality of connecting holes with two ends passing through are arranged in the middle of the rotating disk.

6. The portable high-precision calibration plate structure according to claim 1, characterized in that: The calibration plate bracket and the calibration plate are made of aluminum or aluminum alloy.

7. The portable high-precision calibration plate structure according to claim 1 is characterized in that: The calibration plate bracket includes a vertical plate and a mounting plate. The bottom of the calibration plate is connected to the top of the mounting plate via the vertical plate. The connecting component is connected to the mounting plate. The vertical plate is a hollow structure.

8. The portable high-precision calibration plate structure according to claim 7, characterized in that: The bottom of the mounting plate is provided with a mounting cavity, the connecting component is installed in the mounting cavity, and the positioning notch is arranged on the outer side wall of the mounting plate.

9. The portable high-precision calibration plate structure according to claim 1, characterized in that: The magnetic attraction plate is an annular structure, and a plurality of mounting holes are provided on the magnetic attraction plate. The magnetic attraction plate is screwed and connected to the calibration plate bracket through mounting bolts passing through the corresponding mounting holes; The magnetic plate is provided with a clearance hole, and the bottom of the positioning pin passes through the clearance hole and is arranged below the bottom surface of the magnetic plate.

10. The portable high-precision calibration plate structure according to claim 1, characterized in that: The calibration points include a plurality of first calibration points and a plurality of second calibration points, and the size of the first calibration points is smaller than the size of the second calibration points.

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