Author: Site Editor Publish Time: 2024-02-04 Origin: Site
1. Impact on the rail wheel
Wheel tread abrasion or stripping, so that the wheel can not run on the rail, increasing wheel vibration and impact, if serious, in the rail joints or turnouts may cause derailment accidents.
2. Impact on bearings
Due to scuffing or stripping the rail wheel vibration increases, will directly affect the normal operation of the roller and raceway in the bearing, very easy to cause bearing failure.
3. The impact on the spoke plate hole
Wheel tread scuffing, peeling on the bearings of the greatest impact, and then one is the spoke plate hole, according to my workshop in 2009 on the spoke plate hole of this survey, a total of 259 pieces, of which 187 pieces of tread scuffing peeling problem, accounting for 72.2%, visible tread scuffing, peeling on the spokes of the hole of the impact of the plate is quite large, especially should pay attention to is that, if the spokes of the plate once the hole is cracked, the consequences of which are quite serious. Recall that on 29 January 06, 26192 goods train in Zhengzhou bureau tower shop station off-line accident, is because of the spoke plate hole cracks caused by the wheel popping and the occurrence of off-line.
Vehicle tread abrasion, stripping will make the tread partially depressed, resulting in the use of train vehicles in the use of cyclical up and down vibration, especially at low speeds when the vibration and impact will be greater, will directly damage the line's planar structure, if the turnout at the rail joints or rail joints are also easy to turnout or rail joints pressed off.
Train wheel tread abrasion, stripped due to up and down vibration causes the vehicle running extremely unstable, directly causing the vehicle shaking increase, which also makes the safety of goods by the danger.
Wheel tread is divided into cone type tread and wear type tread, cone type tread is by the wheel inside face out between 48mm to 100mm to 1:20 taper section and between 100mm to 35mm to 1:10 taper section two parts, and wear type tread is by radius 100mm, 500mm, 220mm three arc line smooth connection into a curve and taper 1. 8 a straight line composed of geometric figure: 8 of a straight line composed of geometric shapes, now the use of vehicles almost all use this wear type tread wheel.
First, the braking force is too large: mainly brake structure is unreasonable, brake valve, air duct and related brake cylinder relief valve and other temporary failure or empty car repositioning.
The second is to hold the brake: mainly brake failure, brake tile gap automatic adjuster and brake cylinder failure or between the levers don't strength and other aspects of the cause.
Third, the train wheel itself is poor material: there are slag, running too long, fatigue spalling, and due to the braking process produces too high a temperature and then cooled, so that after repeated thermal expansion and contraction crushing spalling and so on caused by stripping.
First, shunting operation: frequent use of iron shoe braking, which is one of the main factors in the tread surface abrasion, according to our field of operation actual investigation, shunting operation, slipping speed within 25 km / h, using one side of the iron shoe braking, generally a single heavy car using the iron shoe end of the tread surface will be abraded by a minimum of 0.1mm relative to the end of the 0.15mm, empty car under the iron shoe end of the tread surface will be abraded by 0.05-0.1mm relative to the surface will reach 0.1mm, and the tread surface will be abraded by the iron shoe end of the 0.05-0.1mm. The tread surface of the iron shoe end under empty vehicle will be scratched 0.05-0.1mm and the relative surface will reach 0.1mm to 0.15mm.
Secondly, the use of hand brake after forgetting to loose or can not be completely relaxed, and the compilation of the train, once the delivery and operation can not be found, although not directly caused by the nature of the running wheel holding brake, but because of the prolonged friction between the brake tile and the wheel, but also make the tread surface temperature is rising, and the tread surface plastification and fall off, but also to the future peeling caused hidden trouble.
First, the line surface is not flat, such as uneven or uneven, as well as rail joints or welded ends and so on can cause wheel tread abrasion or stripping.
Second, the rail spacing can not be consistent, as well as changes in the width of the upper surface of the rail can make the wheel tread and the normal contact arc of the rail is damaged, resulting in tread surface damage.
Third, the height difference between the inner and outer rails of the rail bends caused by the side of the extrusion also affects the normal rolling surface of the wheel tread surface, thus causing some damage.
Environmental factors is also a reason can not be ignored, China's railway transport lines across the country, the vehicle used in the environment is unpredictable, and the temperature difference is very great, a vehicle on the same day may experience different seasons of the environment test.
Currently from the fundamental solution to the problem of tread abrasion, peeling is not realistic enough, but can be reduced from the vehicle tread abrasion, peeling the opportunity to occur and produce the impact on the vehicle side to start:
First, as soon as possible to eliminate the wheels with spoke plate holes, because the spoke plate cracks almost always start from the spoke plate holes;
The second is to strengthen the TPDS forecast monitoring and inspection site operation inspection, early detection of the problem, do not make the trend of scuffing and peeling to develop again;
Thirdly, the overhaul and column inspection should strengthen the inspection and maintenance of brake fittings to ensure that the application standards are in line with the regulations, and to eliminate the occurrence of problems such as holding the brake;
Fourth, the cooperation of relevant departments, such as public works to minimise line problems, car shunting to minimise or not use the iron shoe brake.
