Portable universal large diameter measuring gage used for greatness diameter measurement and measurement method thereof

Abstract

The invention relates to a general portable large diameter measuring gauge and a method in particular to huge diameter measuring device and method with high accuracy and significantly improved measurement efficiency. The measuring gauge consists of a series of independent measuring units (1) and an inside micrometer (2) with a V-shaped gauge button. Each measuring unit (1) comprises a thing-in-itself (13), a front positioning component (11), a back positioning component (12), a plurality of same fixing mechanisms (14) with permanent magnets (1411), two same auxiliary positioning mechanisms (15) and an auxiliary supporting mechanism (16) comprising an auxiliary supporting component (161) which can be moved and locked for the measuring unit (1) with longer length. The inside micrometer (2) with a V-shaped gauge button is constituted by a common inside micrometer and a lengthening bar (23) linked to the common inside micrometer with a V-shaped measuring button (232) at one end.

Description

technical field [0001] The invention relates to a significantly improved efficiency-improving device for high-precision measurement of huge diameters and a measurement method thereof, and relates to the technical field of length measurement. technical background [0002] Measuring huge diameters is a difficult job. The portable universal large-diameter gauge based on Chinese patent (patent No. 96117113.8) and US patent (patent No. 6330753B1) (hereinafter referred to as the current portable universal large-diameter gauge) provides a measurement of large diameters (including huge diameters) Apparatus and methods. The portable universal large-diameter measuring gauge is composed of a series of mutually independent measuring units, and each measuring unit is composed of two positioning elements, a fixing mechanism, a body and several accessories. Two measuring units are located at both ends of the body, which are a sphere (or a cylinder) and a cylinder (or a sphere) respective...

AI Technical Summary

Problems solved by technology

But for the current portable general-purpose large-diameter measuring gauge, this will bring a series of problems: (1) After the measuring unit is lengthened, its own weight will also increase. In order to make it reliably adsorbed on the surface of the measured circumference, a larger The magnetic force will increase the bending deformation of the measurement unit body, resulting in an increase in the length error of the measurement unit and a decrease in measurement accuracy

(2) After the measurement unit is lengthened, its own weight will also increase, which increases the difficulty of operation

As in the embodiment described in the aforementioned Chinese patent and US patent Fig. 2, it is impossible to measure the outer diameter with a sufficiently large bow height, and when measuring the inner diameter, the magnet 14 needs to be screwed in for a long distance by the knob, which is troublesome to operate

The embodiment described in the aforementioned Chinese patent and US patent Fig. 6 cannot measure the inner diameter with a sufficiently large bow height, because the distance between the main magnetic device located in the middle of the measuring unit body and the measured surface is too large at this time, resulting in a significant weakening of the magnetic force

In the embodiment described in the above-mentioned US patents Fig. 8 and Fig. 9, the magnet 142 needs to be screwed in for a long distance by the knob when measuring the inner diameter, and the operation is cumbersome

Moreover, the screw-in direction of the magnet is not perpendicular to the surface to be measured, which weakens the magnetic effect of the magnet 142

(4) After the measurement unit is lengthened, if the two positioning elements of the measurement unit are cylinders, it will become very difficult to ensure the parallelism of the axes of the two cylinders in manufacturing

The gap method requires the use of gauge blocks (usually several gauge blocks of different sizes are spliced ​​together) or feeler gauges to measure the gap between a cylinder and a sphere, which is inconvenient to operate and very inefficient

The double cylinder method first needs to fix a long cylinder as an accessory on the measured circumference to ensure that the axis of the long cylinder is parallel to the measured circumference axis. This process is cumbersome

Secondly, the double cylinder method needs to measure the distance between two cylinders with a conventional measuring tool such as an outer micrometer, because it is difficult to find the inflection point, which seriously affects the measurement efficiency and accuracy

Images