Universal measuring tool and measuring method of diameter of trapezoid packing ring groove

Abstract

The invention provides a universal measuring tool and a measuring method of the diameter of a trapezoid packing ring groove. The measuring tool is composed of a vernier caliper with a watch and measuring auxiliary pieces. Two measuring auxiliary pieces are symmetrically arranged on a measuring claw under the frequently-used vernier caliper with the watch, and two protruding spherical measuring heads are symmetrically arranged under standard connection blocks of the measuring auxiliary pieces. In the measuring process, the lower faces of the two standard connection blocks are attached to the flat planes of flanges to be used as measuring standards. The side faces of ball heads of the two spherical measuring heads are respectively in contact with inclined planes of two corresponding sides of the trapezoid packing ring groove. A direct measuring value of the vernier caliper with the watch is read, a relevant correcting value is added or subtracted, so that the value of the diameter of an outer circle or the diameter of an inner circle of the measured trapezoid packing ring groove is obtained. The measuring tool has the advantages of being simple in structure, visual in value reading, strong in universality, and convenient to use. The detection time of the trapezoid packing ring groove can be shortened, and the measuring accuracy of the trapezoid packing ring groove is improved.

Description

technical field [0001] The invention relates to a trapezoidal backing ring groove measuring tool used in the production process of mechanical products. Background technique [0002] Sealing two flange planes in contact with each other with trapezoidal gasket groove and metal gasket ring is the main connection and sealing method between various high-pressure components in domestic and foreign oil, gas industry and other mechanical equipment. Therefore, the American Petroleum Institute (API) 6A standard flange ring groove frequently appears on the flange plane where the various parts of petroleum machinery and wellhead equipment are in contact with each other. Due to the "trapezoidal" cross-section of this type of backing ring groove, plus the 45° chamfer on the top edge and the excessive rounding on the bottom edge, the measuring claw of the ordinary vernier caliper cannot find a foothold, resulting in the backing groove. Diameters are difficult to measure accurately. The d...

AI Technical Summary

Problems solved by technology

Although the clamp can roughly determine whether the size of the gasket ring groove is qualified or not, it cannot give accurate measurement data, which is not conducive to the adjustment of the processing size of the gasket ring groove and the quality improvement; moreover, for trapezoids with different diameters, different angles, and different groove widths The ring groove requires a lot of clamping boards, which brings troubles to storage and use

The second is the vernier caliper for measuring the trapezoidal ring groove with beveled edges, such as the "trapezoidal ring groove center distance inspection tool (ZL201020148215.5)", which can only measure the inner diameter of the trapezoidal ring groove, and it is difficult to measure its outer circle Diameter; when encountering trapezoidal ring grooves with different angles, it is necessary to prepare and replace measuring jaws with different angles; in addition, the contact surface between the beveled edge of the measuring jaw and the slope of the trapezoidal ring groove is large, which is easily affected by the trapezoidal ring groove or The angle error of the measuring jaw and the influence of machining accuracy make the measured size less accurate

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