CN102607456A - Measuring device for pipe radian - Google Patents

Abstract

The invention discloses a pipeline radian measuring device, which solves the problem of low measurement accuracy existing in the existing measuring device. The guide rod (2) is provided with a vernier box (3) which can slide along the guide rod (2), the main string measuring grating (10) is arranged on the guide rod (2), and the vernier box (3) is set There is a chord indicating grating (9), a lifter hole (14) is set in the vernier box (3), a spring (5) is set on the upper part of the lifter hole (14), and the movement is set in the lifter hole The upper end of the ejector rod (4) in (14) is connected with the lower end of the spring (5), and the lower end of the ejector rod (4) passes out to the outside of the lower part of the cursor box (3). A pulley (6) is arranged at the lower end, an arc measuring indicating grating (7) is arranged inside the pulley (6), and an arc measuring main grating (8) is arranged on the side of the lower end of the ejector rod (4). The invention has the characteristics of high precision, high resolution and large dynamic measurement range.

Description

Pipeline radian measuring device

technical field

The invention relates to a curved surface radian measuring device, in particular to a measuring device for the diameter of a large-diameter pipeline and the bending radian of an elbow.

Background technique

In the power industry, with the increase in the number of pressure pipelines and the increase in operating time, problems in the manufacture, installation, and operation management of pressure pipelines will gradually be exposed. Pressure pipeline is a kind of pressure equipment, in order to ensure its safe operation, a comprehensive inspection is required. In the field of pressure pipeline inspection, it is often necessary to measure and verify the diameter of pressure pipelines and the bending radius of elbows. The existing technology is to use methods such as radius gauge, ordinary caliper, arc caliper, coordinate measurement, bow height and chord length, etc., but these methods have problems of low accuracy and difficult implementation when they are used for large-diameter pipeline measurement.

Contents of the invention

The invention provides a pipeline radian measuring device, which solves the problems of low measurement accuracy and difficult implementation existing in the existing measuring device.

The present invention solves the above problems through the following solutions:

A device for measuring the arc of a pipeline, comprising a guide rod, a fixed rod perpendicular to the guide rod is fixed at both ends of the guide rod, a magnetic sucker is arranged at the bottom end of the fixed rod, and a guide rod is provided on the guide rod The sliding vernier box is provided with the string measuring main grating on the guide rod, the string measuring indicator grating is set on the vernier box, the ejector rod lifting hole is arranged in the vernier box, and the spring is arranged on the upper part of the ejector rod lifting hole. The upper end of the ejector rod set in the ejector rod lifting hole is connected with the lower end of the spring, and the lower end of the ejector rod passes out to the outside of the lower part of the vernier box. A pulley is arranged at the lower end of the ejector rod, and a measuring device is arranged inside the pulley. The arc indicating grating is provided with an arc measuring main grating on the side of the lower end of the mandrel, and a single-chip microcomputer is arranged on the vernier box.

Buttons and displays are arranged on the panel of the cursor box.

The invention selects the grating displacement sensor as the measuring sensor for the diameter of the large-diameter pipeline and the bending radius of the elbow. The grating displacement sensor is a device that uses the Moiré fringe phenomenon of the grating to measure geometric quantities.

The invention has the advantages of high precision, high resolution and large dynamic measurement range.

Description of drawings

Fig. 1 is a schematic structural view of the main viewing direction of the present invention;

Fig. 2 is a schematic structural view of the vernier box 3 of the present invention.

specific embodiment

A pipeline arc measuring device, comprising a guide rod 2, a fixed rod 1 perpendicular to the guide rod 2 is fixedly arranged at both ends of the guide rod 2, a magnetic sucker 13 is arranged at the bottom end of the fixed rod 1, and a magnetic sucker 13 is arranged on the guide rod 2. There is a vernier box 3 that can slide along the guide rod 2, a main grating 10 for measuring strings is arranged on the guide rod 2, a string measuring indicator grating 9 is arranged on the vernier box 3, and a lifting rod is arranged in the vernier box 3. Hole 14, a spring 5 is arranged on the top of the ejector rod lifting hole 14, the upper end of the ejector rod 4 movably arranged in the ejector rod lifting hole 14 is abutted with the lower end of the spring 5, and the lower end of the ejector rod 4 passes through to the cursor Outside the lower part of the box 3, a pulley 6 is arranged at the lower end of the ejector rod 4, an arc measuring indicating grating 7 is arranged on the inner side of the pulley 6, and an arc measuring main grating 8 is arranged on the side of the lower end of the ejector rod 4, and on the vernier box 3 A single-chip microcomputer 11 is provided, and the single-chip microcomputer 11 is respectively electrically connected with the string measuring main grating 10, the string measuring indicating grating 9, the arc measuring main grating 8 and the arc measuring indicating grating 7.

Buttons 12 and a display are arranged on the panel of the cursor box 3 .

After the fixed rod 1 is fixed on the surface of the pipe, the cursor box 3 slides along the guide rod 2, and the spring 5 makes the pulley 6 at the end of the ejector rod 4 tightly pressed on the curved surface of the pipe and moves. The arc main grating 8 cooperates to measure the arc length of the arc, and the string measuring indicating grating 9 cooperates with the string measuring main grating 10 in the guide rod 2 to measure the arc chord length, and the measured arc chord length and arc length data signals are transmitted to the single-chip microcomputer 11, The single-chip processing circuit calculates the radius of the measured arc through the included data processing program, and outputs it to the liquid crystal display window for display. The button 12 is used for power switch and measurement setting, and the measurement setting includes timing automatic power off, reset and zero operation during measurement, display mode setting, metric and imperial system switching, etc.

The principle of measurement method is as follows:

The arc length of the pipeline arc measured by the cooperation of the arc measuring indicating grating 7 and the arc measuring main grating 8 is ab, and the chord length of the pipeline arc measured by the chord indicating grating 9 and the chord measuring main grating 10 is L, and the radius of the pipeline arc is measured is R, and the radian of the central angle is θ. According to the arc length formula: ab=R×θ, L=2R×Sin(θ/2), L/ab= Sin(θ/2)/(θ/2), By measuring the chord length L and the arc length ab, calculate the ratio L/ab of the chord length to the arc length to obtain the radian θ corresponding to the central angle, and further obtain the diameter of the large-diameter pipe and the bending radius of the elbow according to R=ab/θ.

Claims (2)

1. A pipeline radian measuring device, comprising a guide rod (2), fixed rods (1) perpendicular to the guide rod (2) are fixed at both ends of the guide rod (2), The bottom end is provided with a magnetic sucker (13), which is characterized in that a vernier box (3) that can slide along the guide rod (2) is provided on the guide rod (2), and a string measuring main body is provided on the guide rod (2). The grating (10) is provided with a string measuring indicator grating (9) on the vernier box (3), and a jack lift hole (14) is set in the vernier box (3), and a lift hole (14) is set on the upper part of the jack pin lift hole (14). There is a spring (5), the upper end of the ejector rod (4) which is movably arranged in the ejector rod lifting hole (14) is abutted with the lower end of the spring (5), and the lower end of the ejector rod (4) passes through the cursor box ( Outside the lower part of 3), there is a pulley (6) at the lower end of the ejector rod (4), an arc measuring indicator grating (7) is arranged on the inner side of the pulley (6), and a measuring arc indicator grating (7) is arranged on the lower end side of the ejector rod (4). The main arc grating (8) is provided with a single-chip microcomputer (11) on the vernier box (3), and the single-chip microcomputer (11) is respectively connected with the main grating for measuring strings (10), the indicating grating for string measuring (9), and the main grating for measuring arcs (8) It is electrically connected with the arc measuring indicating grating (7). 2. A pipeline arc measuring device according to claim 1, characterized in that buttons (12) and a display are arranged on the panel of the vernier box (3).

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