A method for reducing shallow crack failures in the wheelset of the first axle of the CRH3 locomotive

Abstract

The present invention discloses a method for reducing shallow crack failures of the wheelset of the leading car of CRH3 EMU. The method comprises the following steps: the small-diameter wheelset of the leading axle is combed in advance before use during peak hours to perform ultrasonic flaw detection, and it is determined whether the wheelset of the CRH3 EMU detected by ultrasonic flaw detection is reassembled during advanced repair. The frequency of the dynamic monitoring system of the train set wheelset is increased, and the monitoring of shallow crack failures of the EMU wheelset is increased. If a shallow crack failure occurs on the tread of the EMU wheelset, the LY equipment monitors and alarms a deep module, and an ultrasonic flaw detector is immediately used for review. If a shallow fault on the tread of the wheelset is found, the wheelset is immediately repaired or replaced. The method further checks whether the leading wheelset of the CRH3 EMU in use is a small-diameter wheelset. Before the CRH3 EMU is put into operation during peak hours, the ultrasonic flaw detection on the leading axle is performed in advance to check whether there is shallow crack. The EMU with small-diameter wheelset of the leading car is combed, and the small-diameter wheelset of the leading car is placed at the reconnecting end.

Description

Technical Field

[0001] The present invention relates to the technical field of high-speed train sets, and in particular to a method for reducing shallow crack failures in axle wheelsets of a CRH3 locomotive head train. Background Art

[0002] With the rapid development of the transportation industry, high-speed railways play a vital role in passenger transportation. Shallow cracks are easily generated on the first axle wheel of the CRH3 EMU during use. The existing technology is to repair the wheelset when cracks are found during maintenance. After repair, the wheel diameter becomes smaller. After the shallow crack failure of the EMU axle wheel set tread occurs, the average repair amount of the existing technology to eliminate the shallow cracks of the axle wheel set is about 10.2mm. When the remaining wheel diameter is small, the wheelset may even need to be replaced, which seriously reduces the service life of the EMU wheelset, resulting in an increase in maintenance tasks and causing large economic losses. Moreover, the frequent occurrence of shallow crack failures of the axle wheelset during use seriously affects the use of the EMU during maintenance and peak usage. The occurrence of shallow failures of the wheelset tread seriously threatens the operation safety of the EMU. Therefore, an improved technology is urgently needed to solve this problem existing in the existing technology. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for improving the wheel-rail matching relationship, so that there are good matching parameters between the head car wheel set and the track, avoiding the shallow cracks caused by the failure to deal with the newly initiated cracks in time, and the need to bore more wheel diameters, or bore until the wheel diameter reaches the service limit and replace the wheelset, thereby reducing the secondary risks brought by the replacement of wheelsets during use; placing the small wheel diameter wheelset of the head car at the re-coupling end, reducing the lateral swing angle, and reducing the tread failure of the head car 1-axle wheelset, thereby reducing the bore and repair of the head wheel set and reducing cost consumption, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a method for reducing shallow crack failure of CRH3 locomotive head vehicle 1 axle wheelset, the

[0005] During reassembly during advanced repair, the same set of wheelsets of CRH3 EMUs are sorted out, and wheelsets with smaller wheel diameters are selected to be assembled in the middle car, and wheelsets with larger wheel diameters are assembled in the lead car;

[0006] Increase the frequency of the dynamic monitoring system for wheelsets and strengthen monitoring of shallow crack faults in EMU wheelsets;

[0007] Check whether the first wheel set of CRH3 EMU in use is a small wheel set;

[0008] Before the CRH3 EMU is put into operation during peak hours, ultrasonic testing is performed on the first axle of the train head to check for shallow cracks.

[0009] Arrange the EMU with small wheel diameter wheelsets on the lead car, and place the small wheel diameter wheelsets on the lead car at the reconnected end.

[0010] Preferably, whether the CRH3 EMU wheelset is reassembled during advanced overhaul;

[0011] When the wheels of CRH3 EMUs inspected by ultrasonic testing are reassembled during advanced repair, the large wheel diameter wheelsets are assembled into the CRH3 EMU head car;

[0012] When ultrasonic testing is performed on the wheels of CRH3 EMUs, it is necessary to check whether the first wheel set of CRH3 EMUs in use is a small-diameter wheelset.

[0013] Preferably, if a shallow crack fault occurs on the tread of the EMU wheelset, the LY equipment monitors the deep module alarm and immediately uses an ultrasonic flaw detector for review. If a shallow crack fault is found on the wheelset tread, the wheelset is immediately repaired or replaced.

[0014] Preferably, the head wheel pair of the CRH3 EMU in use is not a small wheel pair, and a mixed boring method is adopted for boring and repair of the head and intermediate wheel pairs. The boring and repair cycle of the intermediate wheel pairs remains unchanged at 200,000-250,000 kilometers, and the boring and repair cycle of the head wheel pair is adjusted to 160,000 kilometers.

[0015] Preferably, when shallow cracks are found in ultrasonic testing of the front axle 1, the wheel is turned or replaced. When the advanced repaired wheelset is reassembled, the wheelset with a larger wheel diameter is selected and assembled on the lead car, and the wheelset with a smaller wheel diameter in the same group of cars is selected and assembled on the middle car.

[0016] Preferably, the small-diameter wheelset of the lead car is placed at the reconnected end, and during peak passenger flow periods, in order to avoid shallow cracks on the tread of the small-diameter wheelset of the 1st axle of the lead car of the CRH3 EMU, it is repaired to the limit value of 830mm.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) When the defects are not eliminated after boring to the service limit of 830mm, the wheelset needs to be replaced. Before the train is used during peak hours, the small-diameter wheelset of the first car of the CRH3 EMU should be sorted out in advance, and ultrasonic flaw detection should be performed on the small-diameter wheelset of the first car. The shallow defects of the small-diameter wheelset of the EMU should be discovered or eliminated as early as possible, and boring and repair should be carried out in advance to eliminate the damage or replace the wheelset, so as to avoid the impact of shallow defects on the small-diameter wheelset of the first car during peak hours;

[0019] (2) To sort out whether the first wheel set of the CRH3 EMU in use is a small wheel set, and adopt a mixed boring method for boring and repairing the first and middle wheel sets. The boring and repair cycle of the middle wheel set remains unchanged at 200,000-250,000 kilometers, and the boring and repair cycle of the first wheel set is adjusted to 160,000 kilometers. In this way, when cracks initiate or expand slightly on the first wheel set of the CRH3 EMU, the surface fatigue damage of the first wheel set can be eliminated in advance, the wheel-rail matching relationship can be improved, and the matching parameters between the first wheel set and the track can be well matched, so as to avoid the failure to deal with the newly initiated cracks in time, resulting in shallow cracks and the need to boring and repair more wheel diameters;

[0020] (3) After the turning and repair to the limit of 830mm, in order to avoid the occurrence of shallow cracks on the tread of the small wheel diameter wheelset of the first car of the CRH3 EMU during the peak passenger flow period, the defects have not been eliminated after the turning and repair to the limit of 830mm, resulting in the inability of the train set to go online. In advance, the EMU with small wheel diameter wheelset of the first car is sorted out, and the small wheel diameter wheelset of the first car is placed at the reconnected end to reduce the impact load of the small wheel diameter wheelset of the first car, reduce the lateral swing angle, and reduce the tread failure of the wheelset of the first car 1 axle, thereby reducing the turning and repair of the first car wheelset and reducing cost consumption;

[0021] (4) This method improves the wheel-rail matching relationship, so that there are good matching parameters between the head wheel set and the track, avoiding the shallow cracks caused by the failure to deal with the newly emerged cracks in time, and the need to repair more wheel diameters, reducing the secondary risks brought by the replacement of wheelsets during use, reducing the lateral swing angle, and reducing the tread failure of the head vehicle axle wheelset, thereby reducing the repair of the head wheel set and reducing cost consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the process structure of the present invention for reducing shallow crack failures in the wheelset of the first axle of the CRH3 locomotive. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] See also Figure 1The present invention provides a technical solution: a method for reducing the shallow crack failure of the 1-axle wheelset of the CRH3 EMU head car, combing the small-diameter wheelset of the head axle in advance before using the car during peak hours for ultrasonic flaw detection, judging whether the CRH3 EMU wheelset is reassembled during advanced repair, when the ultrasonic flaw detection shows that the CRH3 EMU wheelset is reassembled during advanced repair, the same set of small-diameter wheelsets are selected and assembled with wheelsets with smaller wheel diameter values ​​in the middle car, the CRH3 EMU wheelset is reassembled during advanced repair, and the large-diameter wheelset is assembled in the CRH3 EMU head car, when the CRH3 EMU wheelset is not reassembled during advanced repair, combing whether the head wheel set of the CRH3 EMU in use is a small-diameter wheelset.

[0025] Because shallow defects occurred on the tread of the 1st axle wheelset of the first CRH3 EMU, the remaining wheel diameter was too small during the boring and repair process, resulting in the defect not being eliminated even after boring and repair to the service limit of 830mm, and the wheelset had to be replaced. Before the vehicle is used during peak hours, the small-diameter wheelset of the 1st axle of the first CRH3 EMU is sorted out in advance, and the small-diameter wheelset of the 1st axle of the first car is ultrasonically inspected to detect or eliminate the shallow defects of the small-diameter wheelset of the EMU as early as possible, and boring and repair are carried out in advance to eliminate the damage or replace the wheelset to avoid affecting the use of the vehicle during peak hours due to shallow defects of the small-diameter wheelset of the 1st axle of the first car.

[0026] Increase the frequency of the dynamic monitoring system of the train wheelset, and strengthen the monitoring of shallow crack faults in the EMU wheelset. If a shallow crack fault occurs on the tread of the EMU wheelset, the LY equipment monitors the deep module alarm, and immediately use the ultrasonic flaw detector to review. If a shallow fault on the tread of the wheelset is found, immediately repair it or replace the wheelset.

[0027] It is determined whether the first wheel pair of the CRH3 EMU in use is a small-wheeled wheelset. A mixed boring method is adopted for boring and repair of the first and middle wheel pairs. The boring and repair cycle of the middle wheel remains unchanged at 200,000-250,000 kilometers, and the boring and repair cycle of the first wheel pair is adjusted to 160,000 kilometers. In this way, the surface fatigue damage of the first wheel pair of the CRH3 EMU can be eliminated in advance when cracks initiate or expand slightly, the wheel-rail matching relationship can be improved, and good matching parameters can be achieved between the first wheel pair and the track, avoiding the failure to deal with the newly initiated cracks in time, resulting in shallow cracks and the need to boring more wheel diameters.

[0028] Before the CRH3 EMU is put into operation during peak hours, ultrasonic testing is performed on the first axle of the front train to check for shallow cracks. If shallow cracks are found during ultrasonic testing on the first axle of the front train, the wheel will be turned or replaced. When the wheels are reassembled after advanced repair, the wheelset with a larger wheel diameter will be selected and assembled in the lead car, and the wheelset with a smaller wheel diameter in the same group of cars will be selected and assembled in the middle car.

[0029] Arrange the EMU with small wheel diameter wheelset of the lead car, and put the small wheel diameter wheelset of the lead car at the re-coupling end. In order to avoid shallow cracks on the tread of the small wheel diameter wheelset of the lead car 1 axle of the CRH3 EMU during peak passenger flow, after boring and repairing to the limit of 830mm, in order to avoid shallow cracks on the tread of the small wheel diameter wheelset of the lead car 1 axle of the CRH3 EMU during peak passenger flow, after boring and repairing to the limit of 830mm, the defect has not been eliminated, resulting in the unit being unable to go online. Arrange the EMU with small wheel diameter wheelset of the lead car in advance, and put the small wheel diameter wheelset of the lead car at the re-coupling end. This will reduce the impact load of the small wheel diameter wheelset of the lead car, reduce the lateral swing angle, and reduce the tread failure of the wheelset of the lead car 1 axle, thereby reducing the boring and repair of the wheelset and reducing cost consumption.

[0030] This method improves the wheel-rail matching relationship, ensures good matching parameters between the leading wheel set and the track, avoids the failure to promptly treat newly initiated cracks, which results in shallow cracks and the need to repair more wheel diameters, reduces the secondary risks brought about by wheel set replacement during use, reduces the lateral swing angle, and reduces the tread failure of the leading vehicle axle wheelset, thereby reducing the need to repair the leading wheel set and reducing cost consumption.

[0031] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for reducing shallow crack failures in the wheelset of the CRH3 locomotive head train 1, characterized by: include During reassembly during advanced repair, the same set of wheelsets of CRH3 EMUs are sorted out, and wheelsets with smaller wheel diameters are selected to be assembled in the middle car, and wheelsets with larger wheel diameters are assembled in the lead car; Increase the frequency of the dynamic monitoring system for wheelsets and strengthen monitoring of shallow crack faults in EMU wheelsets; Check whether the first wheel set of CRH3 EMU in use is a small-diameter wheelset; Before the CRH3 EMU is put into operation during peak hours, ultrasonic testing is performed on the first axle of the train head to check for shallow cracks. Arrange the EMU with small wheel diameter wheelsets on the lead car and place the small wheel diameter wheelsets on the reconnected end; Whether the wheelset of CRH3 EMU is reassembled during the advanced repair period; when ultrasonic flaw detection is performed on the wheelset of CRH3 EMU, it is found that the wheelset of CRH3 EMU is reassembled during the advanced repair period; the large wheel diameter wheelset is assembled into the head car of CRH3 EMU; when ultrasonic flaw detection is performed on the wheelset of CRH3 EMU, it is found that the wheelset of CRH3 EMU is not reassembled during the advanced repair period; whether the head wheel set of CRH3 EMU in use is the small wheel diameter wheelset; If a shallow crack occurs on the tread of an EMU wheel set, the LY equipment monitors and detects a deep crack module alarm, and an ultrasonic flaw detector is used for immediate review. If a shallow crack is found on the tread of the wheel set, the wheel set must be repaired or replaced immediately. The head wheel set of the CRH3 EMU in use is not a small-diameter wheelset. A mixed boring method is adopted for boring and repair of the head and middle wheel sets. The boring and repair cycle of the middle wheel sets remains unchanged at 200,000-250,000 kilometers, and the boring and repair cycle of the head wheel set is adjusted to 160,000 kilometers.

2. The method for reducing shallow crack failures in the CRH3 locomotive's front-end vehicle 1 axle wheelset according to claim 1, characterized in that: When shallow cracks are found in the ultrasonic flaw detection of the front axle 1 of the locomotive, the wheel is turned or replaced. When the advanced repaired wheelset is reassembled, the wheelset with a larger wheel diameter is selected and assembled on the lead car, and the wheelset with a smaller wheel diameter is selected and assembled on the middle car in the same group of cars.

3. The method for reducing shallow crack failures in the CRH3 locomotive head vehicle 1 axle wheelset according to claim 1, characterized in that: The small wheel diameter wheelset of the lead car is placed at the re-coupled end. In order to avoid the occurrence of shallow cracks on the tread of the small wheel diameter wheelset of the 1st axle of the lead car of the CRH3 EMU during peak passenger flow, after the defect is repaired to 830mm to the limit, it is still not eliminated, resulting in the train set being unable to go online. The EMU with small wheel diameter wheelset of the lead car is sorted out in advance and the small wheel diameter wheelset of the lead car is placed at the re-coupled end.

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