Conversion mechanism of caliper measuring instrument and caliper measuring instrument with the conversion mechanism

Abstract

The invention provides a switching mechanism of a borehole diameter measuring apparatus and the borehole diameter measuring apparatus with the switching mechanism. The switching mechanism of the borehole diameter measuring apparatus comprises a first connecting arm, a second connecting arm, a third connecting arm, a fourth connecting arm and a potentiometer. The first connecting arm and a main body of the borehole diameter measuring apparatus are hinged to a first hinge joint point, the second connecting arm and the main body are hinged to a second hinge joint point, the third connecting arm and the first connecting arm are hinged to a third hinge joint point, the third connecting arm and the second connecting arm are hinged to a fourth hinge joint point, the third connecting arm abuts against a protrusion arranged on a measuring arm of the borehole diameter measuring apparatus, a first end of the fourth connecting arm is fixedly connected with the second connecting arm, and the potentiometer is matched with a second end of the fourth connecting arm in a pressing-connection mode. When the switching mechanism of the borehole diameter measuring apparatus is used, effective displacement of the measuring arm in the radial direction of the main body can be converted into radial displacement of the third connecting arm in a linear mode, ineffective displacement of the measuring arm in the axial direction of the main body can be filtered out, and thus the purpose of improving generality of the switching mechanism is achieved.

Description

technical field [0001] The invention relates to the field of surveying instruments, in particular to a conversion mechanism of a borehole gauge and a borehole gauge with the switchover mechanism. Background technique [0002] The correlation mode between the measuring arm and the potentiometer of the four-arm caliper measuring instrument in the prior art is mostly figure 1 As shown, the measuring arm 2 is hinged on the main body 4 . As the borehole diameter changes, the measuring arm 2 rotates around the hinge point to make the arc-shaped protrusion at the lower end of the measuring arm 2 depress or release the potentiometer spring 3, thereby changing the output value of the potentiometer 1. [0003] Disadvantages of the prior art: the association between the measuring arm 2 and the potentiometer 1 of the prior art four-arm caliper limits the action form of the measuring arm 2, so that the measuring arm 2 can only log in one direction. Therefore, the correlation method bet...

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Problems solved by technology

[0003] Disadvantages of the prior art: the association between the measuring arm 2 and the potentiometer 1 of the prior art four-arm caliper limits the action form of the measuring arm 2, so that the measuring arm 2 can only log in one direction

Therefore, the correlation method between the measuring arm 2 and the potentiometer 1 in the prior art cannot be applied to other forms of well logging (for example: two-way logging), so that the above-mentioned correlation between the measuring arm 2 and the potentiometer 1 The versatility of the method is poor

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