Precision verification device of dimension measurement equipment

Abstract

The utility model discloses a precision verification device of dimension measuring equipment, which relates to the technical field of precision verification and comprises a fixing rod, a supporting piece and at least two groups of measuring assemblies. The fixing rod is of a rectangular structure. The measuring assembly is arranged on the fixing rod and comprises a connecting rod and a testing ball, the connecting rod is perpendicular to the fixing rod, one end of the connecting rod is fixedly arranged on the fixing rod, and the other end of the connecting rod is connected with the testing ball; the supporting piece is arranged on the fixing rod and is in threaded connection with the fixing rod. The precision verification device of the size measurement equipment is simple in structure and good in stability, the ball center distance between the test balls, the diameter of the test balls and the roundness size of the test balls are measured and then compared with the nominal size value of the precision verification device to calculate the difference value, the equipment precision condition is judged according to the difference value, and the accuracy of the equipment is verified. The precision problem of the size measurement equipment can be found in time, the problem caused by inaccurate subsequent measurement is avoided, and the use is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of precision verification, in particular to a precision verification device for size measuring equipment. Background Art

[0002] A coordinate measuring machine (CMM) is a high-precision measuring device that uses a probe that directly contacts the workpiece surface. The probe's displacement along each coordinate axis determines the coordinates of the measured point, allowing it to measure the three-dimensional dimensions, shape, and positional errors of various workpieces. It is widely used in manufacturing, aerospace, automotive, electronics, molds, and precision machining to ensure product quality and improve production efficiency. Laser scanners and photo-based blue light scanners are optical 3D measurement systems that can quickly acquire workpiece surface data, thereby obtaining dimensional data.

[0003] Three-dimensional dimensional measurement equipment, such as laser scanners, photo-based blue-light scanners, and coordinate measuring machines, undergo metrological calibration by professional metrology organizations and are issued a calibration certificate. This calibration cycle typically lasts one year. However, passing calibration does not guarantee accuracy during actual measurements. If accuracy issues occur during actual measurements, and errors exceed the allowable tolerance, failure to detect the problem in a timely manner can lead to irreversible quality issues on a large scale, posing a significant quality risk. Therefore, developing an accuracy verification device that can intuitively reflect the measurement accuracy capabilities of dimensional measurement equipment and promptly detect errors is a pressing issue for those skilled in the art. Utility Model Content

[0004] The purpose of the utility model is to provide an accuracy verification device for dimensional measuring equipment, which solves the technical problem that when the dimensional measuring equipment is actually measuring, the accuracy problem occurs and the error exceeds the allowable tolerance. If it cannot be discovered in time, it will cause a batch of irreparable quality accidents, which will pose a great quality risk.

[0005] To achieve the above-mentioned purpose, the present invention provides an accuracy verification device for a dimensional measuring device, comprising:

[0006] The fixed rod has a rectangular structure;

[0007] At least two sets of measuring assemblies are provided on the fixed rod, and the measuring assemblies include a connecting rod and a test ball. The connecting rod is arranged perpendicular to the fixed rod, one end of the connecting rod is fixed to the fixed rod, and the other end of the connecting rod is connected to the test ball;

[0008] The support member is provided on the fixing rod, and the support member is threadedly connected to the fixing rod.

[0009] Preferably, the number of the measuring components is three, and the three test balls are located on the same straight line.

[0010] Preferably, the three test balls are at the same height.

[0011] Preferably, the distances between two adjacent test balls are unequal.

[0012] Preferably, the test ball is a ceramic matte ball.

[0013] Preferably, the diameter of the test ball is 38 mm.

[0014] Preferably, the surface of the fixing rod is provided with a matte paint layer.

[0015] Preferably, a plurality of reflective marking points are provided on the surface of the fixing rod.

[0016] Preferably, the connecting rod is threadedly connected to the fixing rod, and glue is injected at the threaded connection between the connecting rod and the fixing rod.

[0017] Preferably, the number of the support members is three, and one of the support members is located on the perpendicular bisector of the line connecting the other two support members.

[0018] Compared with the above-mentioned background technology, the accuracy verification device for dimension measuring equipment provided by the utility model has a simple structure and strong versatility. It is suitable for three-dimensional dimension measuring equipment such as laser scanners, photographic blue light scanners, and three-coordinate measuring machines. By measuring the center distance between the test balls, the diameter of the test balls, and the roundness dimension data of the test balls, the above dimension data are compared with the nominal dimension value of the accuracy verification device to calculate the difference. The accuracy of the equipment is judged by the size of the difference, and the accuracy problems of the dimension measuring equipment can be discovered in time to avoid problems caused by subsequent inaccurate measurements. It has good stability and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0020] Figure 1 A front view of the accuracy verification device for the dimension measuring equipment provided by an embodiment of the present utility model;

[0021] Figure 2 This is a top view of the accuracy verification device of the dimension measuring equipment provided by an embodiment of the present utility model.

[0022] Figures 1 to 2Reference numerals in the accompanying drawings: 10, fixing rod; 20, measuring assembly; 21, connecting rod; 22, test ball; 30, supporting member; 40, reflective marking point. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0025] The core purpose of this utility model is to provide an accuracy verification device for dimensional measuring equipment, which is suitable for the accuracy verification of equipment such as three-dimensional coordinate measuring machines, laser scanners, and photographic blue light scanners. It can verify the accuracy error before the formal measurement of the product, and promptly discover possible equipment error deviations to avoid problems caused by subsequent inaccurate measurements.

[0026] Please refer to Figures 1 to 2 The accuracy verification device of the dimension measuring equipment provided by the utility model includes a fixed rod 10, a support member 30 and at least two sets of measuring components 20; the fixed rod 10 is a rectangular structure; the measuring component 20 is arranged on the fixed rod 10, and the measuring component 20 includes a connecting rod 21 and a test ball 22, the connecting rod 21 is arranged perpendicular to the fixed rod 10, one end of the connecting rod 21 is fixed to the fixed rod 10, and the other end of the connecting rod 21 is connected to the test ball 22; the support member 30 is provided on the fixed rod 10, and the support member 30 is threadedly connected to the fixed rod 10.

[0027] The rectangular structure of the fixing rod 10 ensures that the accuracy verification device does not easily roll on the platform during use, facilitating subsequent measurements. During use, the accuracy verification device is typically placed on the platform, and the support member 30 provided on the fixing rod 10 serves to support the fixing rod 10. The support member 30 may be a screw or bolt, for example.

[0028] By measuring the center-to-center distance between test balls 22, the diameter of test balls 22, and the roundness of test balls 22, and comparing these dimensional data with the nominal dimensional values of the accuracy verification device to calculate the difference, the accuracy of the device can be judged by the size of the difference, thereby promptly identifying accuracy issues with the dimensional measurement equipment and avoiding problems caused by subsequent inaccurate measurements. It should be noted that the nominal dimensional values of the accuracy verification device are the dimensional data such as the diameter of the test balls 22, the roundness of the test balls 22, and the center-to-center distance issued by the professional metrology verification bureau, which can ensure the accuracy of the accuracy verification results.

[0029] Please refer to Figures 1 to 2 In this embodiment, three sets of measurement assemblies 20 are used, with three test balls 22 positioned on the same straight line. By providing three sets of measurement assemblies 20, three sets of ball center distance data, three sets of test ball 22 diameter data, and three sets of test ball 22 roundness data can be obtained. By collecting multiple sets of data, the accuracy of the verification results can be guaranteed.

[0030] Please refer to Figures 1 to 2 In this embodiment, the three test balls 22 are at the same height.

[0031] Please refer to Figures 1 to 2 In this embodiment, the spacing between two adjacent test balls 22 is unequal. When the distances between two adjacent test balls 22 are equal, two of the three sets of ball-center distance data obtained are equal. However, when the spacing between two adjacent test balls 22 is unequal, three different sets of ball-center distance data are obtained. This configuration increases the amount of measurement data, reduces errors by comparing multiple sets of data, and ensures the accuracy of the verification results.

[0032] Preferably, the test ball 22 is a ceramic matte ball. The standard part of the precision verification device, that is, the test ball 22 in the present embodiment, needs to meet the requirements of surface state, stable structure, and small dimensional change. For photographic structured light scanners, due to the characteristics of the equipment, it is difficult to obtain surface point cloud data for highly reflective surfaces such as steel balls, which may cause data distortion. The general solution is to spray a developer on the surface of the steel ball, but this method will cover the surface of the steel ball with a layer of developer, thereby changing the actual size of the steel ball. It is inconvenient to use and may cause corrosion, affecting the dimensional stability of the standard part. Therefore, when the test ball 22 uses a matte ball, it can meet the requirements of surface state, stable structure, and small dimensional change, and is suitable for precision verification of photographic structured light scanners.

[0033] Preferably, in this embodiment, the diameter of the test ball 22 is 38 mm. The diameter of the test ball 22 can be set according to actual needs and can be other sizes.

[0034] Preferably, a matte paint layer is provided on the surface of the fixing rod 10. The matte paint layer on the surface of the fixing rod 10 is made of acrylic paint. Acrylic paint has the characteristics of low cost, strong adhesion, easy operation, and good weather resistance. After the surface is matte treated, the fixing rod 10 can reduce light reflection during scanning and measurement, thereby improving measurement accuracy.

[0035] Furthermore, in this embodiment, the fixing rod 10 is made of a 7050 alloy in a T6511 state. Manufactured through extrusion, heat treatment, and stretching, the fixing rod 10 exhibits high strength, corrosion resistance, and sufficient stress relief, thereby enhancing the stability and durability of the precision verification device.

[0036] Please refer to Figures 1 to 2 The surface of the fixing rod 10 is provided with a plurality of reflective marking dots 40, which can be affixed to the surface of the fixing rod 10. The plurality of reflective marking dots 40 are irregularly distributed on the surface of the fixing rod 10. For a photographic blue light scanner, the provision of reflective marking dots 40 satisfies the basic requirements for structured light scanning measurement. The surface of the fixing rod 10 is planar, and affixing the reflective marking dots 40 to the surface of the fixing rod 10 does not cause deformation. Furthermore, based on the principle of splicing 3D point cloud data using a point-based laser scanner, the reflective marking dots 40 are located around the perimeter of the test sphere 22 for optimal results, thereby ensuring measurement accuracy.

[0037] Preferably, the connecting rod 21 is threadedly connected to the fixing rod 10, and glue is injected into the threaded connection between the connecting rod 21 and the fixing rod 10. This configuration improves the connection strength between the connecting rod 21 and the fixing rod 10 and ensures the stability of the accuracy verification device during use. The glue can be AB type glue.

[0038] Please refer to Figures 1 to 2 The number of the support members 30 is three, wherein one support member 30 is located on the perpendicular bisector of the line connecting the other two support members 30 . By providing three support members 30 , the fixing rod 10 can be stably supported.

[0039] The precision verification device of the dimension measuring equipment provided by the present invention has a simple structure and good stability. When in use, the precision verification device is first placed on the platform. When the platform is kept horizontal, the precision verification device can be placed on the platform and then subsequent verification operations can be carried out. At this time, the fixed rod 10 is stably set on the platform through the support of three support members 30. The dimension measuring device measures the spherical center distance between the test balls 22, the diameter of the test balls 22, the roundness of the test balls 22 and other dimensional data, compares the above data with the nominal dimension value of the precision verification device to calculate the difference, and judges the accuracy of the equipment by the size of the difference, which can timely discover the accuracy problems of the dimension measuring equipment and avoid problems caused by subsequent inaccurate measurements. The precision verification device is easy to use and has low processing costs.

[0040] The precision verification device for dimension measuring equipment provided by the present invention adopts a ceramic matte ball as the test ball 22, and a matte paint layer and a plurality of reflective marking points 40 are provided on the surface of the fixing rod 10. The device can meet the precision verification requirements of various three-dimensional dimension measuring equipment such as laser scanners, photographic blue light scanners, and three-dimensional coordinate measuring machines, and has strong versatility. By collecting multiple sets of data, the accuracy of the verification results can be guaranteed, and the device is stable and easy to use.

[0041] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0042] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. An accuracy verification device for a dimension measuring device, characterized in that: include: The fixed rod has a rectangular structure; At least two sets of measuring assemblies are provided on the fixed rod, and the measuring assemblies include a connecting rod and a test ball. The connecting rod is arranged perpendicular to the fixed rod, one end of the connecting rod is fixed to the fixed rod, and the other end of the connecting rod is connected to the test ball; The support member is provided on the fixing rod, and the support member is threadedly connected to the fixing rod.

2. The accuracy verification device for dimension measuring equipment according to claim 1, characterized in that: The number of the measuring components is three, and the three test balls are located on the same straight line.

3. The accuracy verification device for dimension measuring equipment according to claim 2, characterized in that: The three test balls are at the same height.

4. The accuracy verification device for dimension measuring equipment according to claim 3, characterized in that: The distances between two adjacent test balls are not equal.

5. The accuracy verification device for a dimension measuring device according to any one of claims 1 to 4, characterized in that: The test ball is a ceramic matte ball.

6. The accuracy verification device for dimension measuring equipment according to claim 5, characterized in that: The test ball has a diameter of 38 mm.

7. The accuracy verification device for dimension measuring equipment according to claim 1, characterized in that: The surface of the fixing rod is provided with a matte paint layer.

8. The accuracy verification device for dimension measuring equipment according to claim 7, characterized in that: The surface of the fixing rod is provided with a plurality of reflective marking points.

9. The accuracy verification device for dimension measuring equipment according to claim 1, characterized in that: The connecting rod is threadedly connected to the fixing rod, and glue is injected at the threaded connection between the connecting rod and the fixing rod.

10. The accuracy verification device for dimension measuring equipment according to claim 1, characterized in that: There are three support members, one of which is located on the perpendicular bisector of the line connecting the other two support members.

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