Double-marble balanced centering type internal dial gauge

Abstract

The invention provides a double-marble balanced centering type internal dial gauge. The double-marble balanced centering type internal dial gauge comprises a measuring part, an ejector pin part and a master meter, wherein the ejector pin part comprises a main gear, a main shaft, an ejector pin, a volute spring, a lower end cover and a sleeve, the main gear is arranged at the bottom of the main shaft, the ejector pin is arranged between a main shaft sealing cover and the upper end surface of the main shaft, the master meter is fixed at the side end of a fixed ring through a fixed support, the lower end cover is arranged below the volute spring which is fixed below the main gear, the measuring part comprises a lower box, an upper box, two inner measuring rod sleeves and two inner measuring rods, one ends of the inner measuring rods are inserted in through holes of inserting parts of the inner measuring rod sleeves, and the end parts of the two inner measuring rods extend out of the two sides of the lower box and the upper box. The double-marble balanced centering type internal dial gauge has the advantages that the defect of incapability of centering in short time during earlier stage balanced centering is overcome, and a dead zone in a variable orifice is visible, so that whether a dial gauge stand is balanced and centered and whether the measurement state is achieved can be judged through direct visual observation, the measurement time is shortened as much as possible, and the measuring accuracy is improved.

Description

technical field [0001] The invention relates to the field of detection instruments, in particular to a double-ball balance centered inner diameter dial gauge. [0002] Background technique [0003] The working principle of the old-fashioned inner diameter dial gauge: [0004] The application of the inner diameter dial gauge has a history of many years, which mainly adopts the principle of leverage, and the measurement is as figure 1 As shown, after the main body of the inner diameter dial gauge is put into the hole to be measured, since the specially adjusted measuring head is 3-5mm larger than the hole diameter, the movable measuring head shrinks inward under the action of pressure, pushing the V-shaped equi-ratio right angle in the main body. The lever rotates around the fixed axis, and pushes up the push rod crossed with the movable measuring head, and then pushes the dial gauge length measuring tool to achieve the purpose of displaying the length. [0005] How to use...

AI Technical Summary

Problems solved by technology

[0014]Aiming at the above problems, the present invention is a dual-ball balance centered inner dial indicator. For defects that cannot be centered in a short period of time, the blind area in the hole is visible, so that it can be judged through direct visual observation whether the dial indicator frame is balanced and centered, whether it has reached the measurement state, and the measurement time is shortened as much as possible. To improve the measurement accuracy, for this purpose, the present invention provides a double-ball balance centered inner diameter dial indicator, the inner diameter dial indicator includes a measuring part, a push rod part and a main gauge, and the push rod part includes a main gear, Main shaft, ejector rod, volute spring, lower end cover and sleeve. There is a main gear at the bottom of the main shaft, a main shaft casing outside the main shaft, a sleeve on the upper end of the main shaft, and a main shaft cover on the upper end of the sleeve. There is a ejector rod between the main shaft cover and the upper end surface of the main shaft, the ejector rod is covered with a support spring, the ejector rod has a bearing inside, the top of the ejector rod part has a fixed ring, and the main watch passes through the fixed bracket Fixed on the side end of the fixed ring, the scroll spring is fixed under the main gear through a stop pin, and there is a lower end cover under the scroll spring, and the lower end cover is fixed under the lower box of the measuring part through mounting screws. The part includes a lower box body, an upper box body, 2 inner measuring rod sets and 2 inner measuring rods, the lower box body and the upper box body are fixed together by connecting screws, the 2 inner measuring rod sets and 2 inner measuring rod sets The inner measuring rod is in the lower box and the upper box, and the inner measuring rod cover includes an insertion part and a rack part. One side of the rack part of the inner measuring rod cover has teeth, and the main gear of the ejector rod part It meshes with the teeth of the rack parts of the two inner measuring rod sleeves, the insertion part of the inner measuring rod sleeves has a through hole, each of the inner measuring rod sleeves corresponds to one inner measuring rod, and one end of the inner measuring rod Inserted into the through hole of the insertion part of the inner measuring rod sleeve, the inner measuring rod is covered with an inner measuring rod sealing ring, and the inner measuring rod sealing ring is between the inner measuring rod and the inner measuring rod sleeve. The ends of the two inner measuring rods protrude from both sides of the lower box and the upper box

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