CN1225634C - Reducing detector - Google Patents

Abstract

The present invention relates to a pipeline detecting device which is composed of an outer shell, a computer barn, sensors, leaf springs and a leather bowl, wherein the outside is the shell in a circle structure; the computer barn gathering signals is arranged in the shell and is connected to the sensors through cables. The leather bowl in a horn type structure is fixed outside a detector end; a plurality of sensors are uniformly arranged in the leather bowl and are fixed at the outer side of the detector end, keeping a certain slant to the shell axis. The leaf springs are arranged at sides of the sensors; one end of each leaf spring is fixed with the detector end via a rotary shaft, and the other end with a slight arc contacts the inner side of the leather bowl. The other end of each leaf spring is stressed because of the deformation of the leather bowl, so the leaf springs are bent and the stressed pressure sensors output signals which are sampled and processed by a computer to calculate a change quantity of a pipe diameter via a formula. The present invention has the advantages of simple structure, convenient installation and operation, high measuring precision and application to various pipelines for automatic detection of the pipe diameter.

Description

A kind of reducing detecting device

Technical field

The present invention relates to a kind of pipe detection device, be specially adapted in pipe-line, measure and use.

Background technology

At present, because a large amount of exploitations of oil and natural gas and industrial application, the energy must be transported to application purpose ground with conveyance conduit, because the character of oil gas and conveying is remote, so conveyance conduit is required very strict, the parameters of conveyance conduit should be noted at any time as the variable quantity of caliber, to guarantee the smooth safe transport and the application of oil gas.

At least to so far, also do not retrieve the document of relevant pipeline reducing diameter measurement aspect automatically.

Summary of the invention

For solving the measurement of pipe-line caliber variable quantity, purpose of the present invention provides a kind of reducing detecting device, utilizes the pressure transducer and the control circuit of detecting device, just can realize that the reducing amount of pipeline is carried out robotization to be detected accurately.

Technical scheme of the present invention is such realization: its structure of detecting device of the present invention is by housing, calculate cabin, pressure transducer, flat spring and leather cup are formed, its structure is that the outside is housing, rounded structure, the calculating cabin of acquired signal is housed in housing, connect with pressure transducer by cable, the external stability of detecting device termination has leather cup, the flare structure, equally distributed many group pressure transducers are housed in leather cup, pressure transducer is fixed on the outside of detecting device termination, with the housing axis tilt, in sensors sides flat spring is housed, an end and the detecting device termination of flat spring are fixed with rotating shaft, and another termination has side contacts in arc and the leather cup slightly, the applanation sensor signal point contact of flat spring, whole device is an integral body (as shown in Figure 1).

Advantage of the present invention: simple in structure, easy to install, measuring accuracy is high, can be applicable in the various pipelines and caliber to be carried out robotization detect.

Description of drawings

Fig. 1 is a kind of reducing detector arrangement schematic diagram;

Fig. 2 is a kind of reducing detecting device stress point instrumentation plan;

Among the figure: 1 detecting device housing, 2 leather cups, 3 flat springs, 4 pressure transducers, 5 calculate cabin

Embodiment

Detailed structure of the present invention and principle of work are as shown in drawings, its course of work: Fig. 1 is the first segment housing 1 of reducing detecting device, in leather cup 2 inboards thereafter equally distributed some flat springs 3 are housed, one end is fixed with fulcrum, the other end is against on leather cup 2 inwalls, close on stiff end pressure transducer 4 is housed, be to calculate cabin 5 in the detecting device housing 1, connect with pressure transducer 4 by lead, when detecting device moves in pipeline, caliber distortion place will cause that leather cup 2 shrinks, flat spring 3 distortion, make pressure transducer 4 that signal output be arranged, signals collecting in the cabin 5 as calculated, after the analysis of disposal system, data storage is in computing machine, after detection is finished, analyze that data provide the amplitude of caliber distortion again and in the position of pipeline.

The deformation detection cell operation principle of reducing detecting device is reduced to (as shown in Figure 2), the leather cup distortion, to cause that the flat spring end is stressed, flat spring oar song, signal output is arranged after pressure transducer is stressed, the amplitude and the flat spring end points oar degree of signal output are linear, and by calibration, the signal of sensor can accurately reflect the variation of caliber.

In order to make the flat spring reliable operation, can be according to the distortion f of flat spring, selected preload makes flat spring make predeformation.

The oar degree of flat spring end:

$f=\frac{F(L_1+L_2){\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="C20041002133200051.png"\; state="\{\{state\}\}">L</figure-callout>}}_2^2}{3\mathrm{EI}}$

Wherein, $I=\frac{{\mathrm{<figure-callout\; id="3"\; label="bh"\; filenames="C20041002133200051.png"\; state="\{\{state\}\}">bh</figure-callout>}}^3}{12};$ The E-elasticity modulus of materials

The maximum stress in bend of flat spring: $\mathrm{\&delta;}=\frac{{\mathrm{<figure-callout\; id="2"\; label="FL"\; filenames="C20041002133200051.png"\; state="\{\{state\}\}">FL</figure-callout>}}_2}{\mathrm{Zm}}\&le;\left[\mathrm{\&delta;}\right]$

Wherein: $\mathrm{Zm}=\frac{{\mathrm{<figure-callout\; id="2"\; label="bh"\; filenames="C20041002133200051.png"\; state="\{\{state\}\}">bh</figure-callout>}}^2}{\mathrm{\&delta;}};$ [δ]-material permissible stress

Have: $f\&le;\frac{z\left[\mathrm{\&delta;}\right](L_1+L_2){\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="C20041002133200051.png"\; state="\{\{state\}\}">L</figure-callout>}}_2}{3\mathrm{Eh}}$

Can select material, the thermal treatment of flat spring and determine flat spring size and sensor by designing requirement according to above-mentioned formula.

Because above-mentioned formula is derived under the small deformation condition, (f＞0.2L when relatively large as if f ₂) result of calculation will have error, can revise.

Claims (1)

1, a kind of reducing detecting device, it is characterized in that this detecting device is by housing (1), calculate cabin (5), pressure transducer (4), flat spring (3) and leather cup (2) are formed, its structure is that the outside is housing (1), rounded structure, the calculating cabin (5) of acquired signal is housed in housing (1), connect with pressure transducer (4) by cable, the external stability of detecting device termination has leather cup (2), the flare structure, equally distributed many group pressure transducers (4) are housed in leather cup (2), pressure transducer (4) is fixed on the outside of detecting device termination, with housing (1) axis tilt, in pressure transducer (4) side flat spring (3) is housed, flat spring (3) one ends and detecting device termination are fixed with rotating shaft, another termination has arc and the interior side contacts of leather cup (2) slightly, applanation sensor (4) the signaling point contact of flat spring (3), and whole device is an integral body.

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