On-line laser processing device used for railway steel rail surface toughening treatment

Abstract

The invention discloses an online laser process device for railway rail surface tenacious treatment, which includes a laser processing vehicle and a power mobile machinery shop. The laser processing vehicle includes a motion actuator, a laser processing head, a control system and / or automatic powder feeder equipped on a moving trolley; the power mobile machinery shop includes a dynamo, a freezer, an air compressor, a refrigerated air dryer and a laser high voltage source equipped on a lorry. The laser processing head is equipped on the motion actuator; the laser processing head is connected to the laser directly or by a light guiding system. The invention can finish laser surface quenching, fused quenching, alloying and cladding on various rails, including rail, bend, guard rail, turnout, etc., without dismantling rail and affecting the normal operation of a train, the processed rail has greatly lengthened its wearability, and has characteristics of easy dismantling, high processing precision and easy operating.

Description

technical field [0001] The invention belongs to the railway track surface strengthening and repairing technology, and relates to an online laser processing equipment for strengthening and repairing the surface of the rail, in particular to an online laser processing equipment for the strengthening and toughening treatment of the surface of the railway rail. Background technique [0002] With the increase of train speed, capacity and axle load, the rate of rail failure due to wear is getting faster and faster, and train derailment accidents caused by rail damage occur from time to time. The direct cost of replacing and repairing damaged rails in our country amounts to billions of yuan every year. [0003] High-speed and heavy-duty trains have higher requirements for train running stability and safety, and better wear resistance and longer service life of steel rails are one of the key factors. For ordinary railway lines, rail damage mainly manifests as hole cracks, vertical ...

AI Technical Summary

Problems solved by technology

However, the main disadvantage of the full-length quenching technology is that martensite or even bainite structure cannot appear on the surface of the rail, otherwise the fracture toughness of the rail will be greatly reduced, resulting in accidents such as rail breakage during the service process, seriously Affect the safe operation of the railway

[0009] First, the delivery vehicles of lasers, refrigerators, processing devices and other equipment are remade from railcars and carriages, which are heavy and bulky and can only move along the railway line, occupying the track

Therefore, it is difficult for this equipment to effectively avoid passing vehicles during the laser toughening treatment of the rail surface, and it cannot meet the processing requirements for laser toughening of the rail surface under normal operating conditions of the main railway line.

[0010] Second, the device uses high power CO 2 laser as light source, either cross-flow CO 2 The laser is still a fast axial flow laser, its photoelectric conversion efficiency is relatively low, bulky, heavy, and consumes a lot of energy

plus CO 2 The laser has high requirements on the stability of the optical cavity, so the tractor and repair vehicle must have good shock resistance, and anti-vibration devices must be added, which further increases the weight of the equipment

[0011] Third, CO 2 The wavelength of the laser is 10.6 microns, and the absorption rate of the metal substrate is very low, so it is necessary to spray light-absorbing paint to obtain better results

Not only increases the laser processing process, but also requires paint spraying, drying and cleaning equipment, which also makes the weight and volume of the entire laser maintenance equipment larger

[0012] Fourth, the adopted CO 2 The laser light guide system is complex, and only the flying optical path can be used and mechanically fastened. The vibration generated during the operation of the laser repair vehicle will inevitably affect the precision of the optical path and reduce the long-term stability of the laser processing process;

[0013] Fifth, the entire laser processing equipment needs to be driven by a high-horsepower diesel engine, which consumes a lot of energy, has a large volume, and the cost of the equipment is also quite expensive

Even if the power line along the electrified line is used, there are various disadvantages such as complicated connection and disconnection operation procedures, and poor applicability

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