SU518406A1 - Method for high-speed defectoscoping of rails - Google Patents

Description

(54) METHOD FOR HIGH SPEED DEFECTION

RAILS

due to the change of the probing parameters and its influence of the searching system, maintaining them equal to the parameters of the probing influence of the searching system in

previous (.

The drawing shows the block-functional schematic diagram of a magnetic flaw detector car that implements the proposed method of high-speed defectoscopy of rails.

In the drawing, the following notation is accepted: 1 - permanent magnet; 2 - a controlled direct current source, for example, a rechargeable battery with an output voltage control system;, 3 selectable magnetosensitive element; 4 - rail; 5 - a recording device, such as a magnetograph; 6 - storage of information about the defects of the current arrival, for example, magnetic tape; 7 - a device that synchronizes the recording speed with the speed of movement of the flaw detector car 8; a tachogenerator 5, which is assigned to a master for the synchronizing device; 9 wheel pair of flaw detector car; 10 signal generator, which fixes the beginning of the checkout on the tape; track section; 11 marker, set on the road away from the rail; 12.13 - units for reading signals from accumulators of information about defects, respectively, current and previous races ;. 14 — accumulator of information about defects of the previous check-in, for example, magnetic tapes; 15 — synchronization: a triggering device / employee for time-sharing of signals — marks from the sensor of the beginning of the monitored path section; 16 - low frequency recorder; 17buj.azhna tape recorder; 18 - marks of the signals of the beginning of the controlled section of the track, diagrams of defects of the previous and current arrivals of the flaw detector car; 19 - shunt from which the signal is taken, proportional to the current in the winding; permanent magnet 1.

The proposed method for the flaw detection of rails is as follows.

When moving the magait 1, fed from a DC source 2, with a searcher 3 above the surface of the core of the rail head 4, the magnetic field intensity fluctuates in the area of the defect. Guided in the seeker 3 emf. generates an electrical signal at the input of the recording device 5, which is recorded on the information store of the current race 6. The recording speed is synchronized using the device 7 with the speed of movement of the flaw detector car, measured by the tacho generator 8 on the axis of the wheel pair 9, before the start of movement on the magnetic Flax. Type 6 with the aid of the generator 1O, recording a signal fixing the beginning of the monitored section from the 11 meter mounted on the track. After the end of the current run, the readout blocks 12-13 read the signals from the magnetic tapes 6 and 14. Before the start of the readout, the start signals of the controlled section of the current and

J of the previous races using the synchronizer 15. Electric signals from both reading blocks 12 and 13 are fed to the playback units of the recorder 16, which record the signals on the adjacent tracks of the paper tape 17. Correctness

the synchronization of the beginning of the monitored section is checked by matching the marks 18.

In the process of recording, the value of the probing effect of the search system is changed by recording to the drive, maintaining it equal to the value of the probe effect of the search system in the previous run. Signals from shunt 19 are recorded for magnetograph 5, which, on subsequent arrival, are fed to the input of the device for regulating the power source 2.

F about rm TL. a and 3 o b e te

Claims (2)

1. The method of high-speed inspection of the rails, laid down in the way, which means that the search system is moved over the rails of the monitored part of the way, record electrical signals about defects during the current run on the information storage device, read the following electric signals: 1, They form them into a visible graphic image and isolate the presence of a defect in the rails according to the shape and amplitude of the graphic image of the signals in the process of comparing them with the shape and amplitude of the classified signals. FROM: DIFFERENT DEFECTS, as well as when comparing with the records on the storage device of the information of the previous check, that is, so that, in order to reduce the likelihood of missing a defect in the process of deciphering the recording of indications during movement flaw detector wagon, Enformatsin fixes the beginning of a controlled section of the track on the storage tape and ensures the constancy of the recording of defects in the storage device, for example, changing the recording speed, synchronously and in proportion to the change in speed of the defectoscope moving car mono- signals ,; simultaneously and synchronously with the tape drives of information about the defects of the previous and current runs, with a speed reduced compared to writing speed, pre-reading synchronization of reading speeds from both data storage devices and aligning the signals fixing the beginning of the co-controlled part of the path, and subsequent conversion of signals into a visible graphic image is performed by a low-frequency recorder with registration on the tape tracks. 2. The method according to claim 1, wherein, in the process of recording signals about defects in the memory fleas of the current drive accumulator, parameters 5 of the probing effect of the search system are changed, supporting them to be the same parameters of the probing effect of the search system in the previous run.