Calibration device for structured light measurement system

Abstract

The utility model provides a calibration device for a structured light measurement system, and belongs to the technical field of detection and calibration. In order to solve the problems that an existing calibration device for a structured light measurement system is high in installation requirement and low in calibration efficiency, the calibration device for the structured light measurement system comprises a reference platform, an installation base and a calibration plate. The reference platform has a horizontal reference surface. The mounting seat is connected with an arm assembly, and the tail end of the arm assembly is connected with an angle joint assembly; the calibration plate is connected with the angle joint assembly; moreover, the arm assembly and the angle joint assembly are used for driving the calibration plate to rotate relative to the reference platform, and the movement range of the calibration plate driven by the arm assembly is larger than that of the calibration plate driven by the angle joint assembly. According to the invention, the assembly operation of the contour detector and the calibration plate is simplified through the reference platform, the installation requirement is reduced, the movement of the calibration plate in multiple directions in the space is realized through the installation seat, the arm assembly and the angle joint assembly, and the calibration efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of testing and calibration technology, and in particular to a calibration device for structured light measurement systems. Background Technology

[0002] Contour inspection instruments are frequently used in rail inspection. These devices, based on machine vision, detect the cross-sectional profile. They typically employ optical transmission and image acquisition using a calibration plate. A series of markers with known geometric parameters are arranged according to certain rules on a standard plate to form a reference point array or pattern, thereby obtaining high-precision measurement results. The device achieves convenient and rapid contour calibration through a calibration mechanism, including the calibration plate.

[0003] like Figure 1 As shown, the existing calibration device mainly consists of a fixed block 1, a calibration plate 60, an adapter plate 2, and a support block 3. The fixed plate 1 is fixed to the calibration pre-drilled holes of the profile detector using M4 countersunk bolts. The structured light measurement system of the profile detector emits light onto the surface of the calibration plate 60. The front of the calibration plate 60 consists of black and white squares and evenly distributed circular holes of known size. The adapter plate 2 and the support block 3 are reserved for calibration of structured light measurements at other angles. This device is suitable for calibration work of structured light measurements at various angles.

[0004] However, the above calibration device has the following drawbacks:

[0005] (1) During operation, the fixed block 1 needs to be manually locked together with the bolt and the contour detector. The hardware hole processing requirements are high and the operator's operation skills are required. It is necessary to avoid stripping the thread when fixing the threaded bolt and to prevent the fixed position from being tightened.

[0006] (2) If an angle deviation is encountered during the calibration process, it is necessary to unlock the fixing block 1 and replace the adapter plate 2 or the support block 3 for fixing. The replacement requires repeated disassembly, which greatly reduces the calibration efficiency. Utility Model Content

[0007] The purpose of this application is to address the problems of high installation requirements and low calibration efficiency in existing calibration devices for structured light measurement systems. Therefore, this application provides a calibration device for structured light measurement systems that simplifies the assembly of the profile detector and calibration plate through a reference platform, reducing installation requirements. Furthermore, it improves calibration efficiency by enabling multi-directional movement of the calibration plate in space through a mounting base, arm assembly, and angle joint assembly.

[0008] This application provides a calibration device for a structured light measurement system, including a reference platform, a mounting base connected to the reference platform, and a calibration plate;

[0009] The reference platform has a horizontal reference surface, and the horizontal reference surface is used to carry the profile detector;

[0010] The mounting seat is connected with an arm assembly, and an end of the arm assembly is connected with an angle joint assembly;

[0011] The calibration plate is connected with the angle joint assembly; and,

[0012] The arm assembly and the angle joint assembly are both used to drive the calibration plate to rotate relative to the reference platform, and a moving range of the calibration plate driven by the arm assembly is greater than a moving range of the calibration plate driven by the angle joint assembly.

[0013] By using the above technical solution, the reference platform provides a horizontal reference surface for the profile detector and the mounting seat (i.e., the calibration plate), so that the calibration plate does not need to be directly connected with the profile detector, the operation of assembling the two is avoided, the installation requirement of the calibration plate is reduced, and the mounting seat, the arm assembly, and the angle joint assembly are ensured to operate on a stable platform, so that the calibration error is reduced; meanwhile, the calibration plate is moved in multiple directions in space relative to the structured light measurement system of the profile detector by the arm assembly and the angle joint assembly, and is calibrated with the profile detector, without the need to disassemble the calibration plate back and forth, so that the calibration efficiency is improved; and the adjustment moving range of the arm assembly is greater than the adjustment moving range of the angle joint assembly, so that the relative position of the calibration plate can be greatly adjusted and finely adjusted, and the calibration error is further reduced and the calibration efficiency is further improved.

[0014] In some embodiments, a support frame is further included, the reference platform is placed on the support frame, the mounting seat is connected with the support frame through a fixing assembly, and the fixing assembly makes the mounting seat flush with the horizontal reference surface of the reference platform;

[0015] The fixing assembly includes a first fixing member and a second fixing member which are arranged in parallel and have a height difference, the first fixing member and the second fixing member are connected through a third fixing member, and the first fixing member and the second fixing member are both horizontally extended long strips;

[0016] The first fixing member is attached to and connected with the surface of the support frame along the length direction of the first fixing member, and the second fixing member is parallel to the side edge of the reference platform.

[0017] Adopting the technical scheme, the reference platform is borne by the support frame and the mounting seat is installed, so that the horizontal reference can be ensured by replacing the reference platform, and the overall maintenance cost is reduced; and the mounting seat is connected with the support frame through the fixing assembly, the first fixing member of the fixing assembly is attached to and connected with the surface of the support frame along the length direction, the stability of the fixing assembly can be ensured, the second fixing member is parallel to the side edge of the reference platform, the mounting seat, that is, the initial position of the calibration plate, can be adjusted along the side edge of the reference platform, and the device is more suitable for various calibration conditions, and the versatility and flexibility of the device are improved.

[0018] In some embodiments, the arm assembly comprises a rotating arm and an extension arm rotatably connected with the rotating arm through a rotary connecting member;

[0019] One end of the rotating arm is rotatably connected with the mounting seat, so that the rotating arm can drive the calibration plate to move in a horizontal plane;

[0020] The axes of the two ends of the rotary connecting member are arranged perpendicular to each other and are rotatably connected with the rotating arm and the extension arm respectively, so that the extension arm can drive the calibration plate to move in a horizontal plane and a vertical plane.

[0021] In some embodiments, the length of the rotating arm is 20-24 cm, and the length of the extension arm is 24-30 cm.

[0022] In some embodiments, the rotating arm is a diagonal rod, and the end of the rotating arm connected with the rotary connecting member is higher than the end connected with the mounting seat.

[0023] In some embodiments, the mounting seat comprises a horizontally arranged bottom plate and a mounting rod vertically arranged on the bottom plate;

[0024] The rotating arm is rotatably connected with the mounting rod.

[0025] In some embodiments, the angle joint assembly comprises a connecting seat, a double-head hinged block and a hinged seat rotatably connected in sequence, and the hinged seat is connected with the calibration plate;

[0026] The connecting seat and the other end of the extension arm are rotatably connected, so that the connecting seat can drive the calibration plate to deflect in a vertical plane;

[0027] The axes of the two ends of the double-head hinged block are arranged perpendicular to each other and are rotatably connected with the connecting seat and the hinged seat respectively, so that the hinged seat can drive the calibration plate to deflect in a horizontal plane and a vertical plane.

[0028] The length of the connecting seat is 4-6 cm, and the length of the double-head hinged block is 6-8 cm; and the connecting seat and the hinged seat are both engineering plastic parts.

[0029] In some embodiments, a base and a horizontal adjusting seat are arranged between the hinged seat and the calibration plate.

[0030] The base is detachably connected with the hinged seat.

[0031] The horizontal adjusting seat is arranged on the base and connected with the calibration plate, and can make the calibration plate parallel to the base.

[0032] Other features and corresponding advantages of the present application are set forth in the remainder of the specification, and will be apparent from the description of the application, and will be appreciated by those skilled in the art. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of an existing calibration device;

[0034] Figure 2 It is a structural schematic diagram of the present application;

[0035] Figure 3 It is another angle structural schematic diagram of the present application, and the reference platform and the support frame are omitted;

[0036] Figure 4 It is a structural schematic diagram of a part of the present application.

[0037] Explanation of reference signs:

[0038] 1, fixed block; 2, adapter plate; 3, support block;

[0039] 10, support frame; 11, first fixing member; 12, second fixing member; 13, third fixing member;

[0040] 20, reference platform;

[0041] 30, mounting seat; 31, bottom plate; 32, mounting rod;

[0042] 40, arm assembly; 41, rotating arm; 42, rotary connecting member; 43, extension arm;

[0043] 50, angle joint assembly; 51, connecting seat; 52, double-end hinged block; 53, hinged seat; 54, base; 55, horizontal adjusting seat;

[0044] 60, calibration plate. DETAILED DESCRIPTION

[0045] The present application will be described with reference to particular embodiments, and applications thereof, which are illustrative of the best now known to the inventors. To those skilled in the art, however, it will be readily apparent from the disclosure herein that the application described and claimed herein can be practiced with modification and alteration within the scope and spirit of the present application. The present application should not be limited, except as by the appended claims, to the embodiments described and shown, which are given by way of example. In the drawings, like reference numerals refer to items of the same or similar structure or function throughout the several views.

[0046] It should be noted that in this specification and the accompanying drawings, similar reference numerals and letters in the drawings represent similar items or features, and thus once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

[0047] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like, indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more. Unless otherwise specified and limited, the terms "mount", "connect", "connect" should be interpreted broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected internally between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] Please refer to Figure 2 , Figure 2 is a schematic view of the structure of the present application.

[0049] The embodiment of the present application provides a calibration device for a structured light measurement system, which comprises a reference platform 20, a mounting seat 30 connected with the reference platform 20, and a calibration plate 60.

[0050] The reference platform 20 has a horizontal reference surface, and the horizontal reference surface is used to carry the profile detector, i.e. the profile detector can be directly placed on the horizontal reference surface of the reference platform 20. Preferably, the reference platform 20 is a marble platform, which is convenient to maintain and more suitable for rail profile calibration.

[0051] The mounting seat 30 is connected with an arm assembly 40, and the end of the arm assembly 40 is connected with an angle joint assembly 50. A calibration plate 60 is connected with the angle joint assembly 50, i.e. the calibration plate 60 is connected with the mounting seat 30 and can be moved in multiple directions in space relative to the structured light measurement system of the profile detector through the arm assembly 40 and the angle joint assembly 50 to adapt to calibration without disassembling the calibration plate 60 back and forth, thereby improving the calibration efficiency.

[0052] The arm assembly 40 and the angle joint assembly 50 are both used to drive the calibration plate 60 to rotate relative to the reference platform 20, and the movement range of the calibration plate 60 driven by the arm assembly 40 is greater than the movement range of the calibration plate 60 driven by the angle joint assembly 50, i.e. the adjustment movement range of the arm assembly 40 is greater than the adjustment movement range of the angle joint assembly 50. Generally, the arm assembly 40 mainly realizes large movement of the calibration plate 60 in the spatial distance, and the angle joint assembly 50 mainly realizes small deflection of the calibration plate 60 in the spatial angle, which can take into account large adjustment and fine adjustment of the relative position of the calibration plate 60, further reduce the calibration error and improve the calibration efficiency.

[0053] Meanwhile, since the profile detector is placed on the reference platform 20, the mounting seat 30 (i.e. the calibration plate 60) is connected with the reference platform 20, so that a horizontal reference surface is provided for both through the reference platform 20, which not only makes the calibration plate 60 not need to be directly connected with the profile detector, i.e. the calibration plate 60 and the profile detector do not need to be locked together through bolts, avoids the operation of assembling the two, reduces the installation requirements of the calibration plate 60, but also ensures that the mounting seat 30, the arm assembly 40 and the angle joint assembly 50 operate on a stable platform, which can reduce the calibration error.

[0054] In an embodiment, the calibration device further comprises a support frame 10, and the reference platform 20 is placed on the support frame 10, and the reference platform 20 and the mounting seat 30 are carried through the support frame 10, so that the horizontal reference can be ensured by replacing the reference platform 20, and the overall maintenance cost is reduced.

[0055] In addition, the mounting seat 30 is connected with the support frame 10 through a fixing assembly, and the fixing assembly makes the mounting seat 30 flush with the horizontal reference surface of the reference platform 20, so that the initial position of the calibration plate 60 is conveniently set.

[0056] In one embodiment, the fixing assembly comprises a first fixing member 11 and a second fixing member 12 arranged in parallel and having a height difference, the first fixing member 11 and the second fixing member 12 are connected by a third fixing member 13, and the first fixing member 11 and the second fixing member 12 are both horizontally extended strips. The first fixing member 11 is attached to and connected with the surface of the support frame 10 along the length direction thereof, so as to ensure the stability of the fixing assembly, and the second fixing member 12 is parallel to the side edge of the reference platform 20, so as to facilitate the adjustment of the mounting seat 30 along the side edge of the reference platform 20, i.e. the initial position of the calibration plate 60, and the fixing assembly is more suitable for various calibration situations, thereby improving the versatility and flexibility of the device.

[0057] Preferably, the first fixing member 11, the second fixing member 12 and the third fixing member 13 are all profiled materials and are fixed by bolts, and further, the third fixing member 13 is an L-shaped profiled material formed by splicing two profiled materials.

[0058] Please refer to Figure 3 , Figure 3 which is another perspective view of the device and omits the reference platform 20 and the support frame 10.

[0059] In one embodiment, the arm assembly 40 comprises a rotating arm 41 and an extension arm 43 rotatably connected with the rotating arm 41 by a rotary connecting member 42.

[0060] One end of the rotating arm 41 is rotatably connected with the mounting seat 30, so that the rotating arm 41 can drive the calibration plate 60 to move in the horizontal plane.

[0061] The two ends of the rotary connecting member 42 are arranged perpendicular to each other and are rotatably connected with the rotating arm 41 and the extension arm 43 respectively, so that the extension arm 43 can drive the calibration plate 60 to move in the horizontal plane and the vertical plane.

[0062] In one embodiment, the length of the rotating arm 41 is 20-24 cm, such as 20 cm, 21.5 cm or 24 cm. The length of the extension arm 43 is 24-30 cm, such as 24.5 cm, 25 cm or 30 cm. The sizes are suitable for most calibration operations.

[0063] In one embodiment, the rotating arm 41 is a diagonal rod, and the end of the rotating arm 41 connected with the rotary connecting member 42 is higher than the end connected with the mounting seat 30, so as to lift the initial height of the calibration plate 60 and facilitate the multi-directional movement of the calibration plate 60 in space.

[0064] In one embodiment, the mounting seat 30 comprises a horizontal bottom plate 31 and a mounting rod 32 vertically arranged on the bottom plate 31. The rotating arm 41 is rotatably connected with the mounting rod 32.

[0065] Please refer to Figure 4 , Figure 4A structural schematic diagram of a part of the present application.

[0066] In one embodiment, the angle joint assembly 50 comprises a connecting seat 51, a double-end articulated block 52 and an articulated seat 53 connected in sequence, and the articulated seat 53 is connected with the calibration plate 60.

[0067] The connecting seat 51 is rotatably connected with the other end of the extension arm 43, so that the connecting seat 51 can drive the calibration plate 60 to deflect in the vertical plane.

[0068] The two ends of the double-end articulated block 52 are arranged perpendicularly to each other and are rotatably connected with the connecting seat 51 and the articulated seat 53 respectively, so that the articulated seat 53 can drive the calibration plate 60 to deflect in the horizontal plane and the vertical plane.

[0069] In one embodiment, the length of the connecting seat 51 is 4-6 cm, for example, 4, 5.5, 6 cm. The length of the double-end articulated block 52 is 6-8 cm, for example, 6, 7.5, 8 cm. The size is suitable for most calibration operations.

[0070] In one embodiment, the connecting seat 51 and the articulated seat 53 are both engineering plastic parts.

[0071] In one embodiment, a base 54 and a horizontal adjustment seat 55 are arranged between the articulated seat 53 and the calibration plate 60. The base 54 is detachably connected with the articulated seat 53. The horizontal adjustment seat 55 is arranged on the base 54 and is connected with the calibration plate 60, and can make the calibration plate 60 parallel to the base 54.

[0072] In this mode, the connection between the articulated seat 53 and the calibration plate 60 is realized by the base 54 and the horizontal adjustment seat 55 as a whole, which improves the convenience of assembly and replacement of the calibration plate 60, and is not easy to cause damage to the calibration plate 60, that is, during assembly, the calibration plate 60 is assembled with the horizontal adjustment seat 55 and the base 54, and then the base 54 is assembled with the articulated seat 53. Moreover, the calibration plate 60 is leveled by the horizontal adjustment seat 55 relative to the base 54, which facilitates the initial position setting of the calibration plate 60 after the device is assembled. Preferably, the horizontal adjustment seat 55 is a three-point horizontal adjustment seat.

[0073] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A calibration device for a structured light measurement system, characterized in that The benchmark platform, the mounting seat connected with the benchmark platform, and the calibration plate; The benchmark platform has a horizontal benchmark surface, and the horizontal benchmark surface is used for bearing the profile detector; The mounting seat is connected with an arm assembly, and the end of the arm assembly is connected with an angle joint assembly; The calibration plate is connected with the angle joint assembly; and The arm assembly and the angle joint assembly are used for driving the calibration plate to rotate relative to the benchmark platform, and the moving range of the calibration plate driven by the arm assembly is greater than the moving range of the calibration plate driven by the angle joint assembly.

2. The calibration device for a structured light measurement system according to claim 1, characterized in that Further comprising a support frame, the benchmark platform is placed on the support frame, the mounting seat is connected with the support frame through a fixing assembly, and the fixing assembly makes the mounting seat flush with the horizontal benchmark surface of the benchmark platform; The fixing assembly comprises first and second fixing members arranged in parallel and having a height difference, the first and second fixing members are connected through a third fixing member, and the first and second fixing members are both horizontally extended long strips; The first fixing member is attached to and connected with the surface of the support frame along the length direction of the first fixing member, and the second fixing member is parallel to the side edge of the benchmark platform.

3. The calibration device for a structured light measurement system of claim 1, wherein, The arm assembly comprises a rotating arm and an extension arm rotatably connected with the rotating arm through a rotary connecting member; One end of the rotating arm is rotatably connected with the mounting seat, so that the rotating arm can drive the calibration plate to move in a horizontal plane; The axes of the two ends of the rotary connecting member are arranged perpendicular to each other and are rotatably connected with the rotating arm and the extension arm respectively, so that the extension arm can drive the calibration plate to move in a horizontal plane and a vertical plane.

4. The calibration device for a structured light measurement system according to claim 3, characterized in that The length of the rotating arm is 20-24 cm, and the length of the extension arm is 24-30 cm.

5. The calibration device for a structured light measurement system of claim 3, wherein, The rotating arm is a diagonal rod, and the end of the rotating arm connected with the rotary connecting member is higher than the end of the rotating arm connected with the mounting seat.

6. The calibration device for a structured light measurement system of claim 3, wherein, The mounting seat comprises a horizontally arranged bottom plate and a mounting rod vertically arranged on the bottom plate; The rotating arm is rotatably connected with the mounting rod.

7. The calibration device for a structured light measurement system of claim 3, wherein, The angle joint assembly comprises a connecting seat, a double-head hinged block and a hinged seat rotatably connected in sequence, and the hinged seat is connected with the calibration plate; The connecting seat and the other end of the extension arm are rotatably connected, so that the connecting seat can drive the calibration plate to deflect in a vertical plane; The axes of the two ends of the double-head hinged block are arranged perpendicular to each other and are rotatably connected with the connecting seat and the hinged seat respectively, so that the hinged seat can drive the calibration plate to deflect in a horizontal plane and a vertical plane; The length of the connecting seat is 4-6 cm, and the length of the double-head hinged block is 6-8 cm; and the connecting seat and the hinged seat are both engineering plastic parts.

8. The calibration device for a structured light measurement system according to claim 7, characterized in that A base and a horizontal adjusting seat are arranged between the hinged seat and the calibration plate; The base is detachably connected with the hinged seat; The horizontal adjusting seat is arranged on the base and connected with the calibration plate, and can make the calibration plate parallel to the base.

Images