Gauge and method for measuring size of transformation position of minor-diameter deep hole

Abstract

The invention discloses a gauge for measuring the size of a transformation position of a minor-diameter deep hole. The gauge comprises a casing and a measuring rod. A sidewall and an upper end face of the measuring rod are respectively provided with a guide head and a conical head, the casing is provided with a measuring passage, and the measuring rod and the conical head can move along the measuring passage. The distance from a lower end face of the guide head to a lower end face of the conical head is identical to the length of the measuring passage. A lower end of the casing is a conical face which is matched with a first conical guide section of the minor-diameter deep hole in shape, and the conical head is matched with a second conical guide section of the minor-diameter deep hole in shape. The bottom of the conical face, the top of the conical head and the transformation position of the minor-diameter deep hole are of a same diameter. A guiding slot is arranged on an upper end face of the casing, and the depth of the guide slot is larger or equal to a qualified inserting depth of the measuring rod. The guide head can move along the guide slot when rotating to the guide slot. The invention further discloses a method for the above gauge. By the aid of the gauge and the method, the size of the transformation position of the minor-diameter deep hole can be measured conveniently, quickly and accurately.

Description

technical field [0001] The invention relates to a test gauge and a test method for the dimension of the variable diameter of a small-diameter deep hole, in particular to the test of the dimension of the variable diameter of the inner hole of the upper support column assembly end plug of the internal component of a pressurized water type nuclear reactor. Background technique [0002] In the structural design of the internal components of the pressurized water nuclear reactor, the upper support column assembly is used to provide guidance and support for the thermocouple measuring the outlet temperature of the core. The end plug of the upper support column assembly is designed with a small diameter variable diameter deep hole. The thermocouple provides support and positioning. When the thermocouple is installed normally, it should pass through the end plug, and its end should be positioned with the variable diameter part of the end plug. [0003] During the reactor installation...

AI Technical Summary

Problems solved by technology

During the processing of multi-piece end plugs, due to tool wear or human error, the size of the variable diameter section is out of tolerance, which cannot be measured and found by the manufacturer, resulting in thermocouples stuck in the inner hole of the end plug during on-site installation. diameter, unable to wear out normally

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