Locating and turning fixture for large end face and shaft hole of valve deck of stop valve

Abstract

The invention discloses a locating and turning fixture for a large end face and a shaft hole of a valve deck of a stop valve. The locating and turning fixture is composed of a fixture body, a bolt and a pressing plate. An end face retaining opening is formed in the outer side of a left disk of the fixture body. The middle portion of the end face of a right disk is provided with a cross-shaped through hole and an external step hole, wherein the outer circle of thea large end face of the valve deck to be machined is in clearance fit with the step hole. The bolt is installed on the inner end face of the left disk. The bolt and the pressing plate are matched and pressed at the edge, where a screw hole is formed, of the valve deck to be machined to form an axial locking structure. The locating and turning fixture conducts clamping under the locating condition, turning of the large end face and the screw hole of the valve deck can be completed in one step, the subsidiary time is short, and production efficiency is high. Above all, turning is conducted under the same locating datum condition, a locating error is set, and the positional accuracy of a turned product meets the design requirement easily.

Description

technical field [0001] The invention relates to a machining fixture, in particular, the invention relates to a large end face of a valve cover and a shaft hole positioning vehicle fixture for a globe valve. Background technique [0002] The bonnet of the stop valve is a T-shaped member, the screw hole on the top is perpendicular to the large end surface of the bottom, and the two are connected by side ribs. The large end face of the valve cover is matched with the top hole of the valve body, and the valve rod installed in the screw hole penetrates downward through the large end face of the bottom to form a spiral lifting mechanism for controlling the valve switch. The vertical accuracy of the screw hole relative to the large end surface determines the flexibility and sealing performance of the screw lifting mechanism. Due to the special shape of the bonnet, general-purpose fixtures are not suitable for clamping. In this industry, special fixtures are usually designed to mac...

AI Technical Summary

Problems solved by technology

[0003] The present invention mainly aims at the problem in the prior art that it is difficult to meet the design requirements for turning the bonnet separately by using two special fixtures, and proposes a large end face and shaft hole positioning car fixture for the stop valve bonnet with simple structure, accurate positioning and reliable connection.

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