SU1283695A1 - Device for checking cavities - Google Patents

Abstract

The invention relates to optomechanical instrument making and improves the accuracy of cavity control. The telescope 1 and the illuminator 2 are mounted on the bracket 3 moving along rod 5, with a jaw 6 attachment unit and screw clamp 7. Circumference scanning rod 15 rotate at the end of the controlled cavity, fixing the disk 8 and the metric scale 10 defect location . The results of the measurement of defects can be recorded; through the eye of the telescope 2 on the film. If the distance to the remote defect is unknown, its dimensions are determined by the test object, which is the outer diameter of the optical fiber 4, combined with the defect. The size of the defect is determined by the internal goniometric scale in the telescope 1. 3 Il. (Ls.

Description

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I 283695

The invention relates to optomechanical instrument making, namely, devices for monitoring the internal cavities of hollow bodies, and can be used to detect and measure defects in internal cavities in mechanical engineering.

The aim of the invention is to improve the accuracy of the control.

Fig. 1 shows a device for monitoring cavities, a general view; FIG. 2 is a view A of FIG. 1, (view of the telescopic telescope and illuminator); in FIG. 3, view B in FIG. 1.

The device contains a telescopic telescope 1 and an illuminator 2 mounted on the bracket 3, as well as a controlled light guide 4 mounted with the possibility of moving along the guide rod 5, on which is applied perpendicular to its forming linear scale. At the ends of the rod 5, there are nodes for fastening it at the end of the cavity, made in the form of jaws 6 and screw clamps 7. At one end of the rod 5 there is also a knot for measuring the angles of rotation of the rod around the longitudinal axis of the cavity in the form of a disk suspended on the semi-axis x .

The telescope 1 and the illuminator 2 are mounted on the same axis of rotation of the bracket 3 moving along the rod 5, while the illumination field is aligned with the field of view of the telescope 1,

The controlled light guide 4 is fixed on a separate bracket and can be rotated in horizontal and vertical planes. The distal part of the light guide 4 is rotatable and can bend and fix within ± 90. The device also contains a common power source for the illuminator 2 and the control light fiber 4. 9,

The device works as follows.

The rod 5 is fixed at the end of the controlled cavity using sponges 6 and fixed with a screw clamp 7. Connect the power source 9 to the illuminator 2 or, in case of need of explosion-proof illumination, to the controlled light guide 4. V To perform circumferential scanning, the rod 5 is rotated at the end controlled cavity (for example

five

0

five

0

measures, large diameter pipes). The disk 8 placed on the rod 5 automatically rotates under the force of gravity and shows the angle of rotation of the rod 5.

Scanning in a plane perpendicular to the optical axis of the telescope 1 is carried out by moving it along the bar 5, Since the field of view of the telescope 1 is aligned with the field of illumination of the illuminator 2, the direction of the light moves synchronously when the line of sight is moved. The location of the detected defect in the inner surface of the cavity under investigation is fixed by the disk 8 and the metric scale 10 on the rod 5,

The size of the defect in the cavity under study is determined by the internal goniometric scale in the optic tube 1, followed by conversion to linear units if necessary,

The results of measuring defects can be recorded on a photographic film against the background of an angular scale by photographing a telescope through the eye's eye,

At slant distances to the measurement point, if the distance to the defect is unknown, the size of the defect is determined by the formula

gtp

-IS- -gSL S

where 1

9f

linear defect size;

It is the linear value of the test object;

(- the angular size of the defect, measured on the scale-grid of the filaments of the goniometric scale located in the telescope;

 - the angular value of the test object, measured on the scale of the filament grid located in the telescope gage scale.

As the test object, the outer diameter of the fiber (equal to 10 mm) is used, which is combined with the defect.

If the distance to the defect is known (from the design of the monitored cavity or measured by a range finder), the size of the defect is determined by the formula

one

Stgoi,

where S is the distance from the visual axis

pipes to defect; d is the angular magnitude of the defect, measured on the scale-grid of the filaments of the goniometric scale located in the visual tube.

Measurement of the distance to a defect can be made by methods known in geodesy. The scale, dividing after one minute, and the distance measuring lines of the rangefinder are plotted on the glass in the plane of the grid of filaments located at the junction of the focal planes of the objective and ocular.

The accuracy of reference, on a scale with interpolation, is 0.1 1. The error in measuring the magnitude of the defect does not exceed 0.1 mm at a distance of 2 - 3 m.

The yarn frame has the ability to move the adjustment 1 /

 screws relative to the telescope body to align the sighting and optical axes.

Claims (1)

Invention Formula A device for controlling cavities, comprising a guide rod with a linear scale, a telescopic telescope and an illuminator, characterized in that, in order to increase the accuracy of control, there are attachment points at the ends of the rod and a node for measuring the angles of rotation of the rod around the longitudinal axis of the cavity at the ends of the rod and a telescopic tube with an illuminator is mounted on a rod with the possibility of their joint movement along it and an angular rotation relative to the axis of the rod, while the telescopic tube is provided with an internal angle ernoy scale. eifo / l (ba. 1rotaapparo.ta) 1Sh-} qiyue.2 Bszb / / / / /