Angle adjustable positioning fixture for a video measuring instrument

Abstract

The utility model relates to a kind of angle-adjustable positioning fixture for image measuring instrument, rotatably mounted on riser by rotating mechanism, so that workpiece installed on positioning member can rotate together, which realizes the angle stepless adjustment of workpiece on measuring platform, operator can adjust workpiece to optimum measurement angle according to the orientation of to-be-measured feature, avoid repeated movement and alignment, greatly improve measurement efficiency and flexibility, and the plate surface of riser is directly used as measurement datum surface, regardless of how rotating mechanism drives workpiece to rotate, the spatial position of this measurement datum surface is fixed, the lens of image measuring instrument can always focus and coordinate calibration with this constant datum surface, effectively eliminate the datum error introduced due to workpiece posture change, thereby significantly improve the measurement repeatability and precision of complex angle feature.

Description

Technical Field

[0001] This utility model relates to the field of workpiece inspection technology, and in particular to an angle-adjustable positioning fixture for an image measuring instrument. Background Technology

[0002] Vision measuring instruments are widely used due to their high efficiency and non-contact nature. In practical measurements, it is often necessary to inspect the dimensions and geometric tolerances of inclined surfaces, tilted holes, or contours with specific angles on workpieces. However, the working table of a vision measuring instrument is usually a two-dimensional translation, lacking the precise positioning function of rotation around an axis.

[0003] Currently, common clamping and measurement methods for workpieces with angular features have obvious drawbacks. First, using simple general-purpose fixtures (such as flat-jaw pliers and magnetic bases) with pads for rough angle positioning is not only inefficient but also has poor repeatability, making it difficult to guarantee consistency in batch measurements. Second, custom-made angle fixtures are used for workpieces with specific angles. Although the accuracy is guaranteed, a single fixture is only suitable for a single angle, lacking flexibility, resulting in high tooling costs and cumbersome management, and failing to meet the needs of modern production and testing for multiple varieties and small batches. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide an angle-adjustable positioning fixture that is compact in structure, easy to operate, flexible in adjustment, and can stably guarantee high measurement accuracy.

[0005] To achieve the above objectives, this utility model employs an angle-adjustable positioning fixture for an image measuring instrument, comprising a base, a vertical plate fixed on the base, a positioning element for positioning the workpiece to be measured, and a rotating mechanism. The surface of the vertical plate constitutes a measurement reference surface, the rotating mechanism is rotatably mounted on the vertical plate, and the positioning element is fixedly mounted on the rotating mechanism.

[0006] The beneficial effects of the above structure are as follows: the rotating mechanism allows the workpiece mounted on the positioning component to rotate along with it, enabling stepless adjustment of the workpiece's angle on the measuring platform. The operator can quickly adjust the workpiece to the optimal measuring angle based on the orientation of the feature to be measured, avoiding repeated movement and alignment, thus greatly improving measurement efficiency and flexibility. Furthermore, the surface of the vertical plate is directly used as the measurement reference plane. Regardless of how the rotating mechanism drives the workpiece to rotate, the spatial position of this measurement reference plane remains fixed. The lens of the image measuring instrument can always focus and calibrate its coordinates using this constant reference plane, effectively eliminating the reference error introduced by changes in workpiece posture, thereby significantly improving the repeatability and accuracy of measuring complex angular features.

[0007] This utility model is further configured with a projection material groove as the positioning element, and is equipped with a groove for accommodating and positioning the workpiece. By matching the shape of the groove with the shape of the workpiece to be measured, the operator only needs to place the workpiece into the groove to automatically complete the initial radial positioning, which greatly simplifies the clamping steps and shortens the preparation time for each measurement.

[0008] This utility model is further configured with a rotating mechanism including a rotating block and a locking bolt. The upright plate has a threaded hole, and the locking bolt passes through the rotating block and engages with the threaded hole on the upright plate to press and lock the rotating block onto the upright plate. Through the planar contact engagement between the rotating block and the upright plate, it is allowed to rotate 360 ​​degrees steplessly when the locking bolt is loosened, thereby achieving fine and continuous adjustment of the workpiece angle.

[0009] This utility model is further configured such that a positioning pin is fixed on the positioning component, and the rotating block is provided with a positioning pin hole that mates with the positioning pin. Through the precise fit between the positioning pin and the positioning pin hole, the positioning component can be automatically and quickly guided to the only correct position and fixed when installing or replacing the positioning component. Attached Figure Description

[0010] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0011] Figure 2 This is an exploded view of the assembly and disassembly of an embodiment of this utility model. Detailed Implementation

[0012] like Figures 1-2 As shown, an embodiment of this utility model provides an angle-adjustable positioning fixture for an image measuring instrument, including a base 1, a vertical plate 2 fixed on the base 1, a positioning element 3 for positioning the workpiece to be measured, and a rotating mechanism 4. The surface of the vertical plate 2 forms a measurement reference surface. The rotating mechanism 4 is rotatably mounted on the vertical plate 2. The positioning element 3 is fixedly mounted on the rotating mechanism 4. The rotating mechanism 4 includes a rotating block 41 and a locking bolt 42. The vertical plate 2 is provided with a threaded hole 21. The locking bolt 42 passes through the rotating block 41 and cooperates with the threaded hole 21 on the vertical plate 2 to press and lock the rotating block 41 on the vertical plate 2. The positioning element 3 is a projection material groove and is provided with a groove 31 for accommodating and positioning the workpiece. A positioning pin (not shown in the figure) is fixed on the positioning element 3. The rotating block 41 is provided with a positioning pin hole 411 that cooperates with the positioning pin.

[0013] Of course, in addition to the above embodiments, this utility model may have other various embodiments. Without departing from the essential technical solution of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, and these changes or modifications are equivalent to the technical solution in this patent. Therefore, these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model, and the utility model creation is in line with the applicant's actual R&D capabilities and resource conditions.

Claims

1. An angle-adjustable positioning fixture for an image measuring instrument, characterized in that: It includes a base, a vertical plate fixed on the base, a positioning element for positioning the workpiece to be measured, and a rotating mechanism. The surface of the vertical plate forms a measurement reference surface. The rotating mechanism is rotatably mounted on the vertical plate, and the positioning element is fixedly mounted on the rotating mechanism.

2. The angle-adjustable positioning fixture according to claim 1, characterized in that: The positioning element is a projection material groove, and it is provided with a groove for accommodating and positioning the workpiece.

3. The angle-adjustable positioning fixture according to claim 1 or 2, characterized in that: The rotating mechanism includes a rotating block and a locking bolt. The upright plate is provided with a threaded hole. The locking bolt passes through the rotating block and engages with the threaded hole on the upright plate to press and lock the rotating block onto the upright plate.

4. The angle-adjustable positioning fixture according to claim 3, characterized in that: The positioning component is fixed with a positioning pin, and the rotating block is provided with a positioning pin hole that cooperates with the positioning pin.

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