RU113006U1 - SECONDARY DEFECTOSCOPE SENSOR MOUNTING UNIT - Google Patents

Abstract

1. A unit for fastening sensors of an in-line flaw detector, which includes a body of a ring of measuring sensors, movable as part of a flaw detector in a plane perpendicular to its axis of symmetry, on which hinged levers with springs (for example, in the form of plates) and measuring sensors are located axisymmetrically, and the springs are made capable of elastically pressing the measuring sensors in the direction from the axis of symmetry of the attachment point, characterized in that the attachment point of the measuring sensors contains a centering polyurethane ring, four annular flanges, an annular movable flange, a ring with four cruciform keys, and the first and second flanges form an annular gap , in which the mentioned ring with keys and the said movable flange are located, which have a central hole that exceeds the diameter of the flaw detector body, the movable flange is rigidly connected to the centering polyurethane ring by means of bushings located on the third flange in p The basics of the first flange, the second flange and the movable flange are equipped with diametrically opposite grooves in which the corresponding keys of the ring are located, the grooves of the second flange are located in a plane perpendicular to the plane of the grooves of the movable flange, and the sensor ring body is attached to the centering polyurethane ring using the fourth flange ... ! 2. The attachment point for the sensors of the in-line flaw detector according to claim 1, characterized in that the said four cruciform ring keys form the first and second groups of ring keys located relative to the other

Description

The utility model relates to devices for in-pipe non-destructive testing of pipelines by passing a flaw detector inside a controlled pipeline, consisting of one or more transport modules, advanced by the pressure of the product flow transported through the pipeline, with sensors installed on its body that are sensitive to parameters reflecting the technical condition trunk pipeline.

In-tube flaw detector sensors are installed concentrically around the perimeter of the flaw detector body in order to overlap its entire inner surface during the monitoring of the pipe condition. In real conditions, the pipe is an imperfect cylindrical body. In the process of movement, an in-line flaw detector undergoes turns of the pipeline, narrowing of the pipeline, sections of pipes of various diameters or various wall thicknesses.

The design of the fastening of the in-pipe flaw detector sensor system during its movement through the pipeline should ensure a tight fit of the sensors to the inner wall of the pipe and a constant orientation of these sensors in the radial and angular direction relative to the longitudinal axis of the flaw detector.

Various mounting systems for sensors of in-line flaw detectors are known.

The sensor system according to US patent 4330748, publication 05/18/1982, IPC G01R 033/00, G01N 027/72, G01N 027/82, as well as US patent 4468619, publication 08/28/1984 IPC G01N 027/82 contains sensors mounted on the base - a slide located around the perimeter of the flaw detector housing. The base is a bent in the form of a parallelogram flexible plate mounted on the flaw detector housing. One branch of the plate is a support for each of the sensors, the other keeps the support from bending from the pipe wall in the place of fastening of each of the sensors.

This sensor mounting system is stationary relative to the flaw detector housing and, due to its stiffness in the transverse direction, provides a constant orientation of the sensors in the radial direction, however, it does not provide enough constant adhesion of the sensors to the pipe surface, especially in pipeline turns, since due to the rigidity of the system it can only track small changes in the diameter of the pipe and does not track the displacement of the flaw detector housing relative to the axis of the pipeline.

Known mounting systems for sensors of in-line flaw detectors (US patent 4098126 dated 07/04/1978, IPC G01B 5/28, NPK US 73/432R, as well as US patent 4,807,484 on 02/28/1989, IPC G01B 5/28, NPK US 73 /865.8; ed. Certificate SU 1157443 dated 05.23.1985, IPC G01N 27/82; US patent 4598250 dated 07/01/1986, UPC 324/220; US patent 5115196 dated 05/19/1992, US patent 4945306 dated 07/31/1990, NPK USA 324/220), passed through the controlled pipeline, containing a housing with sensors installed on it, sensitive to diagnostic parameters that reflect the state of the pipeline wall.

Known mounting systems for sensors of in-line flaw detectors (RF patent RU 2133032 from 10.07.1999, IPC G01N 27/83; as well as patent GB 2257788 from 01.20.93, IPC G01N 27/82, patent GB 2260613 from 04.21.93, IPC G01N 27/87 patent US 5402065 from 03/28/95, UPC 324/220; patents of the Russian Federation RU 2139468, RU 2139469 from 10.10.99; international application WO 00/08378 from 02.17.00, IPC F17D 5/00; patent US 4576097 from 03/18/86, NPK US 104 / 138G; patent GB 2097537 dated 03.11.82, IPC G01N 27/83), passed inside the pipeline under examination, containing a housing with sensors installed on it that are sensitive to diagnostic parameters that reflect the state of the pipeline wall .

A known sensor system according to US patent 5864232, publication 01/26/1999, IPC G01N 27/72, contains sensors mounted on holders, each of which is mounted on the flaw detector housing using a pair of levers. The levers are spaced in the longitudinal direction in a plane passing through the axis of symmetry of the flaw detector, and are able to rotate in this plane. Each specified lever has an axis of rotation at the point of attachment of the holder to the lever and at the place of attachment of the lever to the housing.

The holder together with the sensors is made according to the “parallelogram” scheme, which is stable and, due to its stiffness in the transverse direction, provides a constant orientation of these sensors in the radial direction when passing straight sections of the pipeline. However, such a system does not provide constant contact of the sensors during cornering and in places where the diameter of the pipeline changes, since the base of the sensors can only move parallel to the body and cannot track the bends of the pipeline and the displacement of the flaw detector housing relative to the axis of the pipeline.

Known patent of Russia No. 2225977, publication March 20, 2004, IPC G01M 3/08, F17D 5/00, G01N 27/72. Sensors are installed in holders installed around the perimeter around the symmetry axis of the flaw detector. Each sensor holder is mounted on the flaw detector housing using a pair of levers that can rotate in a plane passing through the symmetry axis of the flaw detector. In each sensor holder, all sensors are located on the tail of the flaw detector with respect to both axes of rotation of a pair of levers in this sensor holder. The distance between the indicated axes of rotation in the sensor holder is not more than 0.2 length of the lever.

This design of mounting sensors ensures that they are pressed during movement along straight sections of the pipeline, including when changing the diameter of the pipe, because the sensor due to the lever system and swivel joints can repeat changes in the profile of the pipe walls. But the design has a relatively low resistance to lateral influences, since two levers are mounted both at the base and at the body at almost the same point. When passing roundings or protrusions in the wall of the pipe, the base may shift relative to the axis of the pipeline, in addition, the sensors may lose contact with the wall.

The closest technical solution (prototype) of the claimed utility model is the sensor mounting unit for an in-line flaw detector, made in accordance with US patent No. 4105972, publication date 04/05/1977, IPC G01N 27/90; G01M 3/00; G01R 33/12).

The specified in-line flaw detector includes an electronic unit and a housing with a magnetic circuit, along the edges of which are placed blocks of magnets on which the brushes are located. In the middle part of the magnetic circuit with the help of a mounting unit, a ring of sensors is mounted axisymmetrically, which are mounted on the contact pads. Sensors with spring levers are pressed against the inner surface of the pipe. The design of the mount unit of the movable ring of sensors is made capable of moving the ring of sensors in the radial direction relative to the body of the flaw detector when passing through the constrictions and turns of the pipeline.

The centering of the sensor ring in the pipeline is effected by springs, i.e. the mass of the sensor ring is compensated by the difference between the forces of the springs in the upper and lower parts of the sensor ring, which leads to a displacement of the sensor ring in the radial direction relative to the axis of the pipeline. The shift of the sensor ring in the radial direction leads to a different angle of inclination of the levers, which, in turn, leads to a mutual linear displacement of the sensors in the axial direction of the pipeline and the deterioration of the accuracy of measurements of pipeline defects. In addition, the sensor ring does not have a rigid fixation relative to the detector body in the angular direction, which does not allow to accurately determine the angular position of the detected defects of the pipeline surface.

The inventive utility model solves the problem of ensuring constant contact of all measuring sensors with the pipe wall, both in straight sections and in bends and in places where the pipe diameter changes, while maintaining the transverse stability of the entire sensor ring during the flaw detector movement and fixing the angular position of the sensors.

The main technical result obtained by implementing the claimed utility model is to increase the reliability of detecting pipeline defects by stabilizing the contact of the measuring sensors with the pipe wall and fixing the angular position of the measuring sensors.

The indicated technical result was obtained due to the fact that the attachment point of the sensor holders of the claimed design is made movable in the radial direction, fixed in angular position and provides the possibility of bending around geometry defects in the pipeline section, as well as passing sections of the pipeline turns with maintaining stable contact of the measuring sensors with the pipeline wall with a fixed angular position of the measuring sensors relative to the flaw detector housing.

Figure 1 shows the mounting node sensors in-line flaw detector assembly (three-dimensional image).

Figure 2 shows the mounting node sensors in-line flaw detector assembly (in section).

Figure 3 shows the mounting unit of the sensors of the in-line flaw detector in a disassembled state.

Figure 4 shows the assembly of the sensors of the in-line flaw detector assembly (the movable flange is shifted to the extreme position relative to the first and second flanges).

Figure 5 shows the in-line flaw detector as an example of using the claimed sensor mount.

In figure 1, figure 2, figure 3, figure 4 and figure 5 the following notation:

1 - housing ring measuring sensors;

2 - lever;

3 - spring (in the form of a plate)

4 - measuring sensor;

5 - polyurethane ring;

6 - the first flange;

7 - the second flange;

8 - movable flange;

9 - ring;

10 - the first group of keys;

11 - the second group of keys;

12 - rack mounts;

13 - the third flange;

14 - the fourth flange;

15 - grooves of the first flange;

16 - sleeve;

17 - the body of the in-line flaw detector;

18 - mounting unit sensors in-line flaw detector.

In the proposed design, the centering of the sensor ring is carried out using a polyurethane ring 5. The sensor mount includes the first and second flanges 6 and 7, which, when assembling the flaw detector, are fixedly mounted on its body. The first and second flanges 6 and 7, rigidly connected to each other, form an annular gap in which the movable flange 8 and the ring 9 are located. The movable flange 8 and the ring 9 have central openings that exceed the cross section of the cylindrical flaw detector housing at the place of installation of the sensor ring. Ring 9 has on its planes the first and second groups of crosswise arranged keys 10 and 11 (figure 3). The first group of dowels 10 interacts with mating grooves on the second flange 7, the second group of dowels 11 interacts with mating grooves on the movable flange 8. On the movable flange 8, by means of fastening posts 12, a third flange 13 is fixed, on which a polyurethane ring 5 is fastened using the fourth flange 14 The mounting posts 12 are located in the grooves 15 of the first flange 6. The polyurethane ring 5 is made with an outer diameter corresponding to the inner diameter of the diagnosed pipeline and consists of two parts (half rings) that connect are interconnected by means of sleeves 16. The housing of the sensor ring 1 is mounted on the fourth flange 14.

The design of the sensor mount works as follows. The movable flange 8 interacts with its grooves with the second group of dowels 11 on the ring 9, which in turn interacts with the first group of dowels 10 with the grooves on the second flange 7. Due to this, the movable flange 8 is able to freely move in the radial direction relative to the flaw detector body in the annular groove formed by the first and second flanges 6 and 7, maintaining its angular position relative to the housing. A polyurethane ring 5, on which a sensor ring 1 housing is fixed through the fourth flange 14, is rigidly connected to the movable flange 8 by means of a third flange 13 and mounting posts 12. When the flaw detector is in the pipeline, the polyurethane disk 5 provides centering of the sensor ring relative to the pipeline axis in the radial direction, due to the fact that the outer diameter of the polyurethane disk 5 is made corresponding to the inner diameter of the pipeline, and the rigidity of the polyurethane disk 5 in the radial direction is multiple exceeds the weight sensor ring. In the event that the flaw detector body is radially displaced in the pipeline, the sensor ring retains its position relative to the axis of the pipeline by means of a polyurethane disk 5. At the same time, the polyurethane disk 5 has sufficient flexibility in the axial direction, which allows the flaw detector to overcome the narrowing of the pipeline. When the flaw detector passes through the pipeline turns, the sensor ring due to the polyurethane disk 5 is shifted radially relative to the flaw detector housing, while maintaining its angular position, which ensures maximum contact of the sensors 4 with the pipeline wall, the most accurate measurement of pipeline defect parameters and eliminates damage to the sensor ring. A similar situation occurs when the flaw detector passes through one-sided narrowing of the pipeline.

The movable flange 8 together with the sensor ring, offset to the extreme position relative to the first and second flanges 6 and 7, is shown in Fig.4.

An example of the implementation of the claimed sensor mounting unit as part of a magnetic in-line flaw detector, on the housing 17 of which the sensor mounting unit 18 is located, is shown in FIG. 5.

Claims (8)

1. The assembly of the sensors of the in-line flaw detector, including the housing of the ring of measuring sensors, movable as part of the flaw detector in a plane perpendicular to its axis of symmetry, on which pivotally mounted levers with springs (for example, in the form of plates) and measuring sensors are axially mounted, and the springs made capable of elastically squeezing the measuring sensors in the direction from the axis of symmetry of the mount, characterized in that the mount of the measuring sensors contains a centering polyurethane a new ring, four annular flanges, an annular movable flange, a ring with four crosswise arranged dowels, the first and second flanges form an annular gap in which the aforementioned ring with dowels and said movable flange are located, which have a central hole larger than the diameter of the flaw detector, movable the flange is rigidly connected to the centering polyurethane ring by bushings placed on the third flange in the grooves of the first flange, the second flange and the movable flange are provided diametrically the opposite grooves in which the corresponding key of the ring is placed, the grooves of the second flange are located in a plane perpendicular to the plane of the grooves of the movable flange, and the sensor ring is secured to the centering polyurethane ring using the fourth flange. 2. The attachment point of the sensors of the in-line flaw detector according to claim 1, characterized in that the four crosswise located dowels of the ring form the first and second groups of dowels of the ring, located relative to each other at an angle of 90º. 3. The attachment point of the sensors of the in-line flaw detector according to claim 1, characterized in that the dimensions of the diametrically opposed grooves of the second flange, the movable flange and the corresponding key of the ring provide the movable flange in the radial direction relative to the first and second flanges while maintaining a constant angular position. 4. The attachment point of the sensors of the in-line flaw detector according to claim 1, characterized in that in the annular gap between the first and second flanges, said ring with dowels is located in front of the movable flange in the direction of travel of the flaw detector. 5. The attachment point of the sensors of the in-line flaw detector according to claim 1, characterized in that the centering polyurethane ring is made with an outer diameter corresponding to the inner diameter of the diagnosed pipeline. 6. The attachment point of the sensors of the in-line flaw detector according to claim 1, characterized in that the polyurethane ring is made of two half rings that are connected to each other by means of bushings. 7. The attachment point of the sensors of the in-line flaw detector according to claim 1, characterized in that the housing of the ring of sensors is located behind the centering polyurethane ring in the direction of movement of the flaw detector. 8. The mounting node sensors in-line flaw detector according to claim 1, characterized in that the centering polyurethane ring is located between the third and fourth flanges.