Special step gauge for evaluating consistency of measurement results

Abstract

The utility model discloses a special step gauge for evaluating the consistency of measurement results, which comprises a positioning block and two groups of standard block assemblies, each standard block assembly comprises a step block and a glass target fixed at the top of the step block, one step block and the positioning block are horizontally and collinearly arranged, the other step block and the positioning block are vertically and collinearly arranged, and the glass target is fixed at the top of the step block. Each step block is connected with the corresponding positioning block through a length-adjustable connecting rod assembly, and each connecting rod assembly comprises a first connecting rod, a second connecting rod and a plurality of extension rods; one end of the first connecting rod is connected with the step block; one end of the second connecting rod is connected with the positioning block; the extension rods are arranged between the first connecting rod and the second connecting rod, every two adjacent extension rods are detachably connected end to end, and the ends of the extension rods located on the two sides are detachably connected with the first connecting rod and the second connecting rod correspondingly. According to the utility model, the distance between the step block and the positioning block can be adjusted through the connecting rod assembly, and the device is suitable for various metered instruments in different measuring ranges.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring instruments, and particularly relates to a special step gauge for evaluating the consistency of measurement results. Background Technique

[0002] Machine vision measuring instruments and image measuring instruments are precision instruments that use machine vision or computer vision for non-contact measurement. With the booming development of the high-end equipment manufacturing industry, machine vision measuring instruments and image measuring instruments are widely used in the fields of large-size measurement, three-dimensional measurement, and high-precision two-dimensional measurement.

[0003] To measure the equipment accuracy of machine vision measuring instruments and image measuring instruments, currently, it is carried out with reference to JJF 1318-2011 "Calibration Specification for Image Measuring Instruments". Among them, it is necessary to evaluate the consistency of the measurement results of the instrument. To evaluate the consistency of the measurement results, a special step gauge is required.

[0004] In the existing technology, the special step gauge is in the shape of two-level steps, and glass target marks are installed on both two-level steps. This kind of special step gauge can only provide a fixed center distance value of the glass target mark. For instruments with different measurement ranges, step gauges with different size specifications need to be equipped, which results in a large number of special step gauges being required for carrying out this metrology work, greatly increasing the metrology cost and reducing the portability of the special step gauge set. Content of the Utility Model

[0005] The purpose of the utility model is to provide a special step gauge for evaluating the consistency of measurement results, which can adjust the measurement range to solve the technical problems that when using a special step gauge to measure the equipment accuracy of machine vision measuring instruments and image measuring instruments at present, a large number of special step gauges need to be equipped, greatly increasing the metrology cost and reducing the portability of the special step gauge set.

[0006] The technical solution of the utility model is as follows:

[0007] A special step gauge for evaluating the consistency of measurement results includes a positioning block and two sets of calibration block assemblies. Each calibration block assembly includes a step block and a glass target fixed on the top of the step block. One of the step blocks is arranged horizontally collinear with the positioning block, and the other step block is arranged vertically collinear with the positioning block. Each step block and the positioning block are connected by a link assembly with adjustable length. The link assembly includes a first link, a second link, and multiple extension rods. One end of the first link is connected to the side wall of the step block facing the positioning block; one end of the second link is connected to the side wall of the positioning block facing the step block; multiple extension rods are arranged between the first link and the second link, and the head and tail of adjacent two extension rods are detachably connected. The end parts of the extension rods on both sides are respectively detachably connected to the first link and the second link.

[0008] Preferably, as a further improvement of the present invention, slots are opened at the ends of the first link and each extension rod facing away from the step block, and magnets are fixed inside each slot. Plugs are fixed at the ends of the second link and each extension rod facing away from the positioning block. The plugs are made of magnetic metal material that can be adsorbed by the magnets.

[0009] Preferably, as a further improvement of the present invention, the shape of the slot is polygonal, and the shape of the plug matches the slot.

[0010] Preferably, as a further improvement of the present invention, the length specifications of the extension rods are different.

[0011] Preferably, as a further improvement of the present invention, the first link and the step block are detachably connected, and the second link and the step block are detachably connected.

[0012] Preferably, as a further improvement of the present invention, horizontally arranged threaded holes are opened on the side walls of the positioning block and the step block facing each other. Connecting screws matching the threaded holes are fixed on the side walls of the first link and the second link facing away from each other, and are threadedly connected to the threaded holes through the connecting screws.

[0013] Preferably, as a further improvement of the present invention, two first cylindrical supports are fixed at the bottom of the step block on the side of the positioning block, and a second cylindrical support is fixed at the bottom of the step block. A triangular positioning support is formed between the two first cylindrical supports and the second cylindrical support.

[0014] Preferably, as a further improvement of the present invention, a counterbore is opened at the center of the top of the step block, and the glass target is fixed in the counterbore.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] The length of the connecting rod assembly is adjusted by assembling different numbers of extension rods, thereby adjusting the distance between the step block and the positioning block, and enabling the adjustment of the center distance between the two glass targets, so as to form special step gauges with various size specifications. The length and height can be freely extended to adjust the measurement range, making it convenient to be applied to measuring instruments with different measurement ranges, significantly reducing costs, and the structure of the special step gauge is detachable, with good portability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. 8 is a front view structural schematic diagram of a special step gauge for evaluating the consistency of measurement results according to an embodiment of the present invention;

[0018] Figure 2 FIG. 12 is a bottom view structural schematic diagram of a special step gauge for evaluating the consistency of measurement results according to an embodiment of the present invention;

[0019] Figure 3 FIG. 16 is an exploded schematic diagram during connection in a special step gauge for evaluating the consistency of measurement results according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will be described in detail with reference to the appended Figure 1 to the appended Figure 3 drawings the specific embodiments of the present invention. In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 thus should not be construed as a limitation to the present invention.

[0021] The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features; in the description of the present invention, unless otherwise stated, the meaning of "plurality" is two or more.

[0022] Embodiment

[0023] As Figures 1 to 3As shown in the figure, an embodiment of the present utility model provides a special step gauge for evaluating the consistency of measurement results, which includes a positioning block 1 and two groups of calibration block assemblies. The calibration block assembly includes a step block 21 and a glass target 22 fixed on the top of the step block 21. One of the step blocks 21 is horizontally collinear with the positioning block 1, and the other step block 21 is vertically collinear with the positioning block 1. Each step block 21 and the positioning block 1 are connected by a link assembly with adjustable length. The link assembly includes a first link 31, a second link 32 and a plurality of extension rods 33. One end of the first link 31 is connected to the side wall of the step block 21 facing the positioning block 1. One end of the second link 32 is connected to the side wall of the positioning block 1 facing the step block 21. A plurality of extension rods 33 are arranged between the first link 31 and the second link 32. The head and tail of adjacent two extension rods 33 are detachably connected, and the end parts of the extension rods 33 located on both sides are respectively detachably connected to the first link 31 and the second link 32.

[0024] In this embodiment, by setting a plurality of detachable extension rods 33, the number of extension rods 33 can be selected and assembled accordingly according to the required measurement range to adjust the distance between the step block 21 and the positioning block 1, and the center distance between the two glass targets can be adjusted, so as to form special step gauges of various size specifications, which can freely extend the length and height, are applicable to measuring instruments with different measurement ranges, significantly reduce costs, and the structure of the special step gauge is detachable and has good portability.

[0025] Specifically, as a specific implementation manner of the detachable connection between the extension rods 33 and between the extension rods 33 and the first link 31 and the second link 32, the detachable connection is carried out by means of magnetic attraction in this embodiment. As Figure 3 shown, slots 4 are opened at the ends of the first link 31 and each extension rod 33 facing away from the step block 21, and magnets 5 are fixed inside each slot 4. Plug blocks 6 are fixed at the ends of the second link 32 and each extension rod 33 facing away from the positioning block 1. The plug blocks 6 are made of magnetic metal materials that can be adsorbed by the magnets 5.

[0026] When connecting, only need to align the plug block 6 and insert it into the slot 4, and use the magnet 5 arranged in the slot 4 to magnetically fix the plug block 6. The detachable connection process is very convenient.

[0027] Furthermore, in order to limit the position of the plug block 6 and prevent it from rotating in the slot 4 and affecting the detection, the shape of the slot 4 is set as a polygonal structure except for a circle, and the shape of the plug block 6 matches the shape of the slot 4. The polygonal edges are used to limit the plug block 6 to prevent it from rotating.

[0028] Further, for the convenience of quick adjustment, the length specifications of the extension rods 33 are set to be different. Specifically, the length specifications of the extension rods 33 can be: 15mm, 20mm, 25mm, 50mm, 80mm, 100mm, 200mm, 300mm, 500mm. For example, when it is necessary to adjust the length of the assembled extension rod 33 to 175mm, only the extension rods 33 with length specifications of 100mm, 50mm, and 25mm need to be assembled in sequence. Compared with the extension rods 33 with a single and identical length, the number of assembled extension rods 33 can be reduced, thereby greatly improving the assembly efficiency.

[0029] Further, the first connecting rod 31 is detachably connected to the step block 21, and the second connecting rod 32 is detachably connected to the step block 21. Specifically, the detachable connection method shown in Figure 3 is adopted. Horizontal threaded holes are provided on the side walls of the positioning block 1 and the step block 21 facing each other. Connecting screws 7 that match the threaded holes are fixed on the side walls of the first connecting rod 31 and the second connecting rod 32 facing away from each other, and the connecting screws 7 are threadedly connected to the threaded holes.

[0030] Furthermore, in order to achieve more stable support, as shown in Figure 2 two first cylindrical supports 81 are fixed to the bottom of the step block 21 on the side of the positioning block 1, and a second cylindrical support 82 is fixed to the bottom of the step block 21. A triangular positioning support is formed between the two first cylindrical supports 81 and the second cylindrical support 82. Through the above settings, compared with planar support, three points determine a theoretical plane, which can provide a relatively more stable support plane.

[0031] Wherein, a counterbore is provided at the center of the top of the step block 21, and the glass target 22 is fixed in the counterbore.

[0032] Some structural dimension parameters involved in the present utility model are as follows:

[0033] Both the step block 21 and the positioning block 1 are cubic blocks with a side length of 40mm. Both the step block 21 and the positioning block 1 are made of a material with good rigidity such as stainless steel. The lengths of the first connecting rod 31 and the second connecting rod 32 are both 50mm.

[0034] The length specifications of the extension rods 33 can be: 15mm, 20mm, 25mm, 50mm, 80mm, 100mm, 200mm, 300mm, 500mm.

[0035] The glass target 22 is a target with a diameter of 5mm engraved on an optical glass with a diameter of 8mm and having a crosshair at the center of the circle.

[0036] Use the special step gauge provided by the present utility model to conduct an evaluation of the measurement result consistency for a vision measuring instrument with a measurement range of 650mm×600mm×300mm.

[0037] According to the requirements of JJF1318-2011 "Calibration Specification for Vision Measuring Instruments", the total length of the special step gauge shall not be less than 4 / 5 of the diagonal of the instrument's working stroke, and the height difference between the two steps shall not be less than 1 / 2 of the Z-direction stroke, that is, the total length shall not be less than 747.26mm, and the height difference shall not be less than 150mm.

[0038] After assembling the extension rods 33 with length specifications of 500mm, 100mm, and 15mm in the horizontal direction, and adding the dimensional parameters of the step block 21, the positioning block 1, the first connecting rod 31, and the second connecting rod 32, a total length of 755mm in the horizontal direction can be finally formed; in the vertical direction, by using the extension rod 33 with a length specification of 15mm and connecting it with the step block 21, the positioning block 1, the first connecting rod 31, and the second connecting rod 32, a total height difference of 155mm in the vertical direction can be formed.

[0039] The measurement principle of the present utility model is as follows:

[0040] Place the assembled special step gauge in the measurement space of the machine vision measuring instrument or vision measuring instrument to be calibrated, and arrange the special step gauge along the space diagonal direction of the measurement space, with a total of 4 positions. At each position, use the machine vision measuring instrument or vision measuring instrument to be calibrated to measure the two glass targets of the special step gauge to obtain the center distance value. A total of 4 center distance values can be obtained, and the difference between the maximum value and the minimum value among the 4 values is the measurement result consistency.

[0041] The above-disclosed are only several preferred specific embodiments of the present utility model. However, the embodiments of the present utility model are not limited thereto, and any changes that can be conceived by those skilled in the art shall fall within the protection scope of the present utility model.

Claims

1. A special step gauge for evaluating the consistency of measurement results, comprising a positioning block (1) and two sets of calibration block assemblies. The calibration block assembly includes a step block (21) and a glass target (22) fixed on the top of the step block (21). One of the step blocks (21) is horizontally collinear with the positioning block (1), and the other step block (21) is vertically collinear with the positioning block (1), characterized in that, Each of the step blocks (21) is connected to the positioning block (1) by a link assembly with adjustable length. The link assembly includes: A first link (31), one end of which is connected to the side wall of the step block (21) facing the positioning block (1); A second link (32), one end of which is connected to the side wall of the positioning block (1) facing the step block (21); A plurality of extension rods (33) are arranged between the first link (31) and the second link (32). The head and tail of adjacent two extension rods (33) are detachably connected, and the end parts of the extension rods (33) located on both sides are respectively detachably connected to the first link (31) and the second link (32).

2. The dedicated step gauge for evaluating the consistency of measurement results according to claim 1, characterized in that, Slots (4) are formed at the ends of the first link (31) and each extension rod (33) facing away from the step block (21), and magnets (5) are fixed inside the slots (4). Plug blocks (6) are fixed at the ends of the second link (32) and each extension rod (33) facing away from the positioning block (1). The plug blocks (6) are made of magnetic metal material that can be adsorbed by the magnets (5).

3. The dedicated step gauge for evaluating the consistency of measurement results according to claim 2, wherein The slot (4) is polygon-shaped, and the shape of the plug block (6) matches that of the slot (4).

4. The dedicated step gauge for evaluating the consistency of measurement results according to claim 3, wherein, The length specifications of the extension rods (33) are different from each other.

5. The dedicated step gauge for evaluating the consistency of measurement results according to claim 1, characterized in that, The first link (31) is detachably connected to the step block (21), and the second link (32) is detachably connected to the step block (21).

6. The dedicated step gauge for evaluating the consistency of measurement results according to claim 5, characterized in that, Threaded holes are horizontally formed on the side walls of the positioning block (1) facing the step block (21). Connecting screws (7) matching the threaded holes are fixed on the side walls of the first link (31) and the second link (32) facing away from each other, and are threadedly connected to the threaded holes through the connecting screws (7).

7. The special step gauge for evaluating the consistency of measurement results according to claim 1, wherein Two first cylindrical supports (81) are fixed at the bottom of the step block (21) on the side of the positioning block (1), and a second cylindrical support (82) is fixed at the bottom of the step block (21). A triangular positioning support is formed between the two first cylindrical supports (81) and the second cylindrical support (82).

8. The dedicated step gauge for evaluating the consistency of measurement results according to any one of claims 1-7, characterized in that, A counterbore is formed at the center of the top of the step block (21), and the glass target (22) is fixed in the counterbore.

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