RU94535U1 - MOBILE DEFECTOSCOPE NEXT CENTERING DEVICE - Google Patents

Abstract

 A centering device for the tracking system of a mobile flaw detector relative to the longitudinal axis of the rail, characterized in that the searchers are equipped with a self-centering device made in the form of permanent magnets placed on the end sides of each seeker on the lateral movement carriages kinematically connected with the searchers and mounted on guide rods rigidly connected to bearing beam suspension of the tracking system.

Description

The inventive technical device relates to the field of rail transport, in particular, to special mobile devices equipped with instrumentation to check the condition of the track, and is intended to provide high-quality rail inspection at high speeds of movement of a mobile flaw detector.

A device of a carrier trolley is known, which is made of two independent uniaxial trolleys and the frame of each uniaxial trolley is connected by a parallelogram mechanism with a common frame, and the following elements are made in the form of servo wheels, while longitudinal beams with a lifting mechanism are articulated on the axle box of the servo wheels of the uniaxial carriages. lowering and the bias correction mechanism of the diagnostic device, and the longitudinal beams are fixed with the possibility of angular and axial movement of uniaxial bogies, the offset compensation unit of uniaxial bogies relative to each other is, for example, a spherical hinge on which a linear bearing is mounted, in the inner cavity of which the end of the longitudinal beam is mounted, and the mechanism for correcting the bias of the searchers is connected to a sensor for monitoring the movement of the tracking wheels (patent for invention RU No. 2309077 ; published October 27, 2007; IPC V61K 9/08; “Carriage Carrier”).

A disadvantage of the known device is the decrease in the quality of diagnostics at high speeds of moving the trolley-carrier of a mobile flaw detector, as well as the need for laborious maintenance.

For the prototype of the claimed technical solution, a centering device for the search system of a mobile flaw detector was adopted, including a bogie, on the transverse frame of which a drive for moving the movable link with contact elements mounted pivotally connected to the guardrails of the tracking ski and located between the guardrails, the ends of which are located between the paddle wheels of the wheelsets of the running gear carts, while the device is equipped with an intermediate link and levers, and the movable link with contact elements is mounted on intermediate link by means of a hinge, the pivot axis of which is parallel to the axis of the hinge connecting the movable link with the guardrails, and the levers are connected to the chassis of the trolley and the guardrails by hinge joints, the pivots of which are parallel to the axis of the hinge connecting the movable link with the guardrails, and each hinge to the chassis of the carriage is placed on a housing rotatable around a horizontal axis, the lever being located on the axis of this hinge with the possibility of movement along the axis in linear guides x parallel to the axis of the hinge of fastening the movable link to the intermediate link, made in the form of a lever mounted by means of a swivel on the frame of the undercarriage, in addition, the movable link is made with adjustable stops (patent for utility model RU No. 38708; published on July 10, 2004; IPC V61K 9/08; "The centering device of the search system of a mobile flaw detector").

The disadvantages of the prototype include the complexity of the design and the associated low reliability of the centering device.

With an increase in the speed of movement of a mobile flaw detector, the known device does not provide the necessary quality of the monitoring devices and the reliability of the measurements, which is associated primarily with the need to use a tracking ski, which requires high complexity during its installation and operation.

Difficulties in using ski tracking are also expressed in the problem of passing turnouts, probable deviations during dynamic impacts, including impacts, the need for dynamic contact with a dirty rail surface, which significantly impairs the quality of the control process.

At high speeds of moving a mobile flaw detector, the quality of the centering device is significantly reduced, not providing, in particular, the necessary accuracy and speed, which leads to uncontrolledness of individual sections of the rail that have not undergone high-quality flaw detection.

The accelerated wear of carbide inserts mounted on a tracking ski reduces the accuracy of centering the search system relative to the longitudinal axis of the rail.

The objective of this technical solution is to simplify the design and improve the quality of monitoring the condition of the rail track while ensuring a high speed of movement of the mobile flaw detector.

The problem is solved due to the fact that in the centering device of the tracking system of a mobile flaw detector relative to the longitudinal axis of the rail, the searchers are equipped with a self-centering device made in the form of permanent magnets placed on the end faces of each seeker on the lateral movement carriages kinematically connected with the searchers and mounted on the guide rods, rigidly connected to the supporting beam of the suspension of the servo system.

The presence of a self-centering device is necessary to provide the searcher with an optimal position above the rail during the monitoring process, which allows to improve the quality of flaw detection, to increase the speed and reliability of the device as a whole.

The implementation of the self-centering device in the form of permanent magnets located on the end faces of each finder greatly simplifies the design, eliminating the need for a bulky complex drive to correct the position of the finder and the need for its regulation and adjustment by additional means.

Placing the permanent magnets of the self-centering device on the end faces of the finder in such a way that their longitudinal axes and the longitudinal axis of the finder are in the same vertical plane as the longitudinal axis of the rail, creates magnetic interaction forces between the magnets and the rail head, which, due to the tendency of the permanent magnets to the initial position, they create a return magnetic force when the finder deviates from the initial optimal position, thereby ensuring the effect of a self-center the search for the seeker.

The presence of carriages mounted on guide rods connected to the suspension suspension beam provides the possibility of their transverse movement relative to the longitudinal axis of the rail.

The presence of the kinematic connection of the finder with the carriages of lateral movement provides stabilization of the position of the finder, directing the finder from the displaced position to the initial position due to the action of the return forces of the magnetic field of the permanent magnets.

The process of self-centering of the working position of the searcher increases the efficiency of flaw detection studies by increasing their reliability while increasing the speed of the mobile flaw detector.

The proposed device self-centering allows you to abandon the contact elements for tracking the rail in the form of a tracking ski or tracking wheels, making contactless centering of the finder, providing a significant advantage of this device when moving and overcoming turnouts at high speeds.

The presence of distinctive features in the claimed technical solution allows us to conclude that it meets the condition of patentability “novelty”.

The patentability condition "industrial applicability" is confirmed by the example of a specific implementation.

The essence of the utility model is illustrated by technical drawings, in which:

figure 1 - presents a General view of the finder with a device for self-centering;

figure 2 is a side view of figure 1;

figure 3 is a General view of the device in a perspective view;

figure 4 is a bottom view of the end of the finder and the device self-centering, in a perspective view.

Figure 1 shows the carrier beam 1 of the tracking system of a mobile flaw detector, which, using the brackets 2, is rigidly fixed to the trolley of a mobile flaw detector (not shown in Fig.).

The tracking system of a mobile flaw detector contains searchers 3, on which the converters of control devices are installed and which during flaw detection move over the rolling surface of the rail head 9.

Permanent magnets 4 are placed on both sides of the end parts of the finder 3, fixed with brackets 5 and levers 6 on the carriage 7 (Fig. 2) of lateral movement. The carriage 7 is installed on the guide rods 8 (figure 4) with the ability to move along them in the direction transverse to the longitudinal axis of the rail 9 (figure 1).

The finder 3 is suspended on the rods 10 of the power cylinders 11 of the vertical movement mechanism of the finder 3.

The power cylinders 11 are mounted on the carriage 7, forming a kinematic connection of the finder 3 with the carriage 7 for its transverse movement.

The guide rods 8 for moving the carriage 7 are spaced from each other by a distance that ensures placement and rigid fastening on the carriage 7 of the power cylinder 11, the free end of the rod 10 of which is connected to one of the ends of the finder 3, with transducers mounted on it.

The self-centering device is installed in such a way that the longitudinal axis of the permanent magnets 4 and the longitudinal axis of the search beam 3 are placed in the same vertical plane with the longitudinal axis of the rail before starting work. In this optimal position, the converters of the monitoring devices provide maximum reliability of the measurement results.

To start work, the permanent magnets 4 on the brackets 5 are rotated relative to the levers 6, moving them from the upper transport position to the lower working position, installing the permanent magnets 4 over the rail 9 with a small gap, determined by the magnitude of the magnetic field between them.

The operation of the centering device of the tracking system is that in the process of moving a mobile flaw detector mounted on a rail vehicle, when external dynamic forces displace the search system from its original position, the magnetic field existing between the rail 9 and the permanent magnets 4 cause the magnets 4 to return in the initial position relative to the longitudinal axis of the rail 9.

Rushing from the displaced position to the initial one, the permanent magnets 4 carry along the carriages 7, which, easily moving along the guide rods 8 and being in kinematic connection with the finder 3, return the finders 3 from the displaced to the initial optimal position, thereby ensuring their self-centering.

In permanent magnets 4, under the influence of a magnetic field, returning forces arise, which are always directed towards the initial equilibrium position and depend on the magnitude of the bias of the finder and the magnitude of the magnetic field, that is, a kind of magnetic “spring” of the self-centering device acts.

Transverse movements of the finder 3 during operation provide carriages 7, which, being in kinematic connection with the finder 3, allow it to return from the biased to its original optimal position by moving the carriages 7 along the guide rods 8.

The rods 8 are rigidly fixed with their ends in the carrier beam 1, mounted using brackets 2 on the trolley of a mobile flaw detector, which during the control moves along the rail track.

A power cylinder 11 for vertical movement of the finder 3, mounted on the carriage 7 and connected by its rod 10 to the finder 3, thereby provides a kinematic connection of the finder 3 with the carriage 7, the transverse movement of which is caused by the forces of the magnetic field of the permanent magnet 4, the return forces of which the seeker constantly seeks to return 3 from the displacement position to the initial optimal control position.

Magnetic forces between the rail and the magnets are permanent and do not require additional devices, drives and external control, thereby ensuring a continuous process of self-centering of the finders in the process of rail track inspection.

The returning forces of the magnetic field are independent of the influence of external factors such as temperature, humidity, dirt, and ice on the rail surface, which distinguishes this device from contact centering devices of search systems, which are largely dependent on external factors.

Tests of the device in question at low temperatures, ice and high snow cover confirmed its high-quality work, in contrast to the results of using known analogues in similar conditions.

Permanent magnets, which do not change their technical characteristics within their service life, guarantee the stable operation of the seeker self-centering device and ensure high efficiency of flaw detection at high speeds of a mobile flaw detector.

Claims (1)

A centering device for the tracking system of a mobile flaw detector relative to the longitudinal axis of the rail, characterized in that the searchers are equipped with a self-centering device made in the form of permanent magnets placed on the end sides of each finder on the lateral movement carriages kinematically connected with the searchers and mounted on guide rods rigidly connected bearing beam suspension of the tracking system.