RU155045U1 - ODOMETER FOR NON-DESTRUCTIVE CONTROL DEFECTOSCOPE - Google Patents

Abstract

Odometer for a non-destructive testing flaw detector, consisting of a body, a body of revolution connected with disk-shaped elements supplying sensors (photocells) with signals going to the electronic unit, characterized in that the odometer measures in two coordinates at the same time as the number of motion detection points rotation bodies of three or more, which rotate in the bearing unit and on the shafts of which disk-shaped elements are fixed, which supply signals to the electronics unit, which processes them according to the corresponding algorithm followed by binding to a two-coordinate system.

Description

The invention relates to the field of non-destructive testing of oil and gas pipelines and can be used in other instruments and devices requiring constant coordinate reference to the place.

The known mechanism by measuring (odometer) of an in-tube projectile flaw detector. It is structurally a wheel mounted in a lever, which, in turn, is mounted on the bracket of the container of an in-tube defectoscope projectile (IRR). A sensor with an integrated Hall element and a magnetic disk are installed in the wheel of the projectile, which structurally consists of two metal disks and six magnets placed between the disks and filled with an epoxy compound. Metal disks are combined in such a way that the internal teeth of one disk enter the grooves of another with a certain gap, creating 25 magnetic pairs. The Hall sensor is fixedly connected to the axis of the odometer wheel, and the disk is connected to the rotating wheel. When the odometer wheel rotates, along with the magnetic disk, pulses are generated in the sensor, which enter the electronic unit via the wires located in the connector, and then to the sealed connector. The spring constantly presses the odometer wheel against the inner wall of the pipeline. In the bracket there is a latch that is designed to fix the odometer only in the transport position. The disadvantage of this type of odometer is its limited capabilities - it counts down only in one coordinate. When using the second odometer located perpendicular to the first, the working surface of the wheel will be abrased. In addition, small angles of rotation of the flaw detector's path to the plane of the odometer wheel will remain unnoticed (the forward-moving odometer will rotate, but the transverse one will not rotate).

The technical problem to be solved in the claimed device is to create a flaw detector movement meter (odometer) that allows measurements in two coordinates at the same time with one device, which will increase the operational properties of the instruments to which they are attached. An odometer for a non-destructive testing flaw detector contains a housing, an electronics unit, and a rotation body made of a material with enhanced frictional properties, with three or more encoders. In contrast to the prototype in the claimed device, the number of pick-up points of the movement of the body of revolution is three or more. This allows you to increase the accuracy of measuring the movement of the body of rotation on the examined surface.

Figure 1-4 shows the main and auxiliary projection of the structural diagram of one of the possible odometer options. The design contains a housing 1, in which all the main constituent elements and nodes of the claimed device are placed: a rotation body 2, a support 3 with balls 4, rollers 5 (three or more pcs.), Rotating in a bearing assembly 6, and on whose shafts disk-shaped elements are fixed 7 encoders, built, in this case, on optical encoders with reflection (for example: AEDR 8300-1Wx). An encoder 8 is fixedly mounted next to each disk-shaped element 7. The assembly unit, which includes the bearing assembly 6, the roller 5 together with the disk-shaped element 7, is spring-loaded (spring 9) in order to create constant contact of the roller 5 with the rotation body 2. Electronics block 10, into which the signals from all encoders 8 converge, processes their signals according to the corresponding algorithm, with subsequent binding to a two-coordinate system. In our case, this algorithm corresponds to the simultaneous operation of three encoders and corresponds to the following dependencies:

where S _x is the number of pulses corresponding to the movement of the flaw detector along the X axis;

S _y is the number of pulses corresponding to the movement of the flaw detector along the Y axis;

S ₁ - the number of pulses of the first optical encoder;

S ₂ - the number of pulses of the second optical encoder;

S ₃ - the number of pulses of the third optical encoder.

This device operates as follows. The body of revolution 2, is supported by a support 3, the surface of which is covered with balls 4, freely moves along the surface under examination in two coordinates. The spring-loaded rollers 5, evenly spaced along the equatorial plane of the ball 2 (in this case, at 120 °), roll along the surface of the body of revolution 2 each along its own path and, using disk-shaped elements 7 and encoders 8, provide information in the form of quadrature signals to the electronic unit. This arrangement of encoders corresponds to the obtained dependences (1).

The source of information

Shell - flaw detector "Mole SK 1000". Technical description and instruction manual. RNKSH 1010.00.00.00.00 TO. LLC "Gazpribora-avtomatikaсervis", Saratov, 2003, 64.

Claims (1)

Odometer for a non-destructive testing flaw detector, consisting of a body, a body of revolution connected with disk-shaped elements supplying sensors (photocells) with signals going to the electronic unit, characterized in that the odometer measures in two coordinates at the same time as the number of motion detection points rotation bodies of three or more, which rotate in the bearing unit and on the shafts of which disk-shaped elements are fixed, which supply signals to the electronics unit, which processes them according to the corresponding algorithm followed by binding to a two-coordinate system.

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