Variable curvature interchangeable base step gauge for automotive exterior surfaces

Abstract

The application discloses a variable-curvature replaceable base gap measuring scale for an automobile outer surface, comprising a main scale body and at least two measuring bases with different curvatures; the main scale body and the measuring bases are detachably connected through a double-pin positioning structure; and the bottom surface of the measuring base is an arc-shaped fitting surface suitable for the automobile curved surface. The application is suitable for the gap high-precision measurement in automobile assembly, sheet metal, quality inspection and the like by replacing the bases with different curvatures to adapt to various automobile body variable-curvature surfaces, preventing rotation through the double-pin positioning, high precision, no need to calibrate zero after replacement, close measurement fitting, accurate reading, and the like.

Description

Technical Field

[0001] This invention relates to the field of automotive assembly inspection tools, specifically to a variable curvature interchangeable base differential measuring ruler for automotive outer surfaces. Background Technology

[0002] In automotive assembly, exterior gap and discontinuity detection, and sheet metal repair, high-precision measurement of the discontinuities between body panels such as doors, fenders, and bumpers is required. Traditional differential measuring rulers mostly use a flat base, which is only suitable for measuring flat surfaces or areas with small curvature. However, the outer surface of a car is mostly a continuously changing surface with varying curvature. When using a traditional flat measuring ruler, the base and the surface cannot fit perfectly together, which can easily lead to problems such as suspension, skewness, and slippage, resulting in unstable measurement reference and large reading errors. Existing measuring tools with replaceable measuring heads mostly use single pin or threaded connections, resulting in low positioning accuracy and poor anti-rotation effect. After replacing the base, recalibration is required, which is cumbersome and inconsistent, making it difficult to meet the needs of rapid and high-precision inspection of automotive exterior parts. Summary of the Invention The purpose of this invention is to overcome the shortcomings of the prior art and provide a step measurement ruler that is compatible with the variable curvature outer surface of automobiles, has high positioning accuracy, is quick to replace, and does not require repeated zeroing. The technical solution adopted by this invention to solve its technical problem is: A variable curvature interchangeable base differential measuring ruler for automobile exterior surfaces includes a main ruler body and multiple measuring bases with different curvatures; The main scale body and the measuring base are detachably connected by a double-pin positioning structure. The bottom surface of the measuring base is an arc-shaped fitting surface, designed with different curvatures according to the curvature of different parts such as doors, fenders, and bumpers, to achieve a perfect fit with the body surface. The beneficial effects of this invention are: 1) By using interchangeable bases with different curvatures, a single main ruler can be adapted to various automotive exterior surface curves, making it highly versatile; 2) It adopts dual-pin positioning, which prevents rotation and offset, has high repeatability, and requires no calibration after replacement; 3) The base bottom surface fits perfectly with the curved surface, ensuring stable measurement and accurate readings, significantly reducing human error; 4) Simple structure and quick operation, suitable for use in various scenarios such as automobile assembly line, after-sales sheet metal, and quality inspection. Attached Figure Description Figure 1. Schematic diagram of the overall structure of the present invention; Figure 2. Schematic diagram of the main scale body and double pin positioning structure; Figure 3. Schematic diagram of measurement bases with different curvatures; Figure 4. Assembly cross-sectional view of the main scale body and measuring base. In the picture: 1. Measuring base; 2. Main scale body; 3. Auxiliary positioning hole; 4. Main positioning hole; 5. Auxiliary positioning pin; 6. Main locating pin; 7. Moving ruler; 8. Scale lines; Detailed Implementation The main body (2) is provided with a main positioning pin (6) and an auxiliary positioning pin (5), one of which is a cylindrical precision positioning pin and the other is an anti-rotation pin, forming a double pin positioning structure. The measuring base (1) has a main positioning hole (4) and an auxiliary positioning hole (3) respectively, which are plug-in quick-change fit with the positioning pin. The bottom surface of each measuring base is designed as an arc-shaped fitting surface with different curvatures according to the curvature of different parts of the car body, respectively adapting to the curved surfaces of car doors, bumpers, fenders, etc. During measurement, select the measuring base with the corresponding curvature and install it on the main scale body. The double pins automatically complete the positioning and anti-rotation. Make the bottom surface of the base completely fit the outer surface of the car. By moving the movable ruler (7) on the main scale body and comparing it with the scale line (8) on the main scale body, the difference value can be read directly. When changing bases with different curvatures, they can be directly plugged in and replaced. The double pins ensure consistent assembly position each time, with high repeatability and positioning accuracy. No recalibration is required, achieving fast, stable, and high precision.

Claims

1. A variable curvature interchangeable base differential measuring ruler for automobile exterior surfaces, characterized in that, Includes a main scale body and at least two measuring bases with different curvatures; The main scale body and the measuring base are detachably connected by a double-pin positioning structure. The bottom surface of the measuring base is an arc-shaped contact surface adapted to the outer surface of the car. Different measuring bases correspond to different curvatures of the car body surface, so as to realize the contact-type discontinuity measurement of the outer surface of the car with variable curvature.

2. The tolerance measuring ruler according to claim 1, characterized in that, The dual-pin positioning structure includes a first positioning pin and a second positioning pin set on the main scale body, and two positioning holes correspondingly opened on the measuring base. The double pins are used to prevent the measuring base from rotating and to ensure precise positioning, thereby improving the repeatability of the positioning after replacement.

3. The tolerance measuring ruler according to claim 2, characterized in that, The first positioning pin is a cylindrical positioning pin, and the second positioning pin is an anti-rotation pin. The two work together to allow direct measurement without recalibrating after the base is replaced.

4. The tolerance measuring ruler according to claim 1, characterized in that, The arc-shaped contact surface of the measuring base is a variable curvature surface, which can completely fit the outer contour of the car door, hood, fender, bumper, taillight, etc., avoiding errors caused by measurement suspension or skew.

5. The tolerance measuring ruler according to claim 1, characterized in that, The main scale body is a universal body. By replacing the measuring base with different curvatures, a single measuring scale can be adapted to measure the discontinuity of various vehicle models and different curvature parts.

6. The tolerance measuring ruler according to claim 1, characterized in that, The measuring base and the main scale adopt a plug-in quick-change structure, which, together with the double pin positioning, enables quick disassembly and assembly, stable positioning, and high measurement accuracy.

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