In this calculation, the single bolt is subjected to a tensile force exceeding the required stress, which exceeds the yield strength of the ordinary bolt steel. Poorly inspected the material of the rail bolts, the source of the screw material is mixed, and the actual stress requirements of the material cannot be guaranteed. After material analysis of the sample, the carbon, silicon and sulfur contents were significantly higher than the ordinary steel index, the steel has low toughness and poor tensile properties.
After the drawing experiment, most of the screw's ultimate tensile strength is less than brittle. The reason for the lack of flexibility of the track bed is that the bed bed is seriously polluted. First of all, the track bed is seriously polluted. The Daqin line and the Beijing-Bao line are the main channels for the transportation of the coal. The coal is scattered on the track bed, the coal powder is water-slurry, and the line is turned over. Mud, the bed bed has reduced elasticity, and there are many illegal places in the line.
The partial occlusion of the line sinks, pulling the guard rail down, so that the relevant guard rail bolts are in the hoisting state. In the long run, the bolts are either broken or broken. Second is the insufficient thickness of the track bed. Most of the bridges in the Datong Works section have bridge ties that have been laid. The thickness of the track bed is generally insufficient, and the thickness of the ballast is insufficient in many sections. The track bed has low elasticity, the train has a large impact force, and the line snoring and spitting phenomenon is more serious, which accelerates the chalking speed of the stone.
When the ring fire occurs, the internal armature element of the motor generally causes the motor to be repaired, which shows that the labor intensity of the workers. Therefore, the analysis of faulty parts and commutator segments is short-circuited by arc, and the inner-flow ring fire in the winding is the cause of the most serious fault of the traction motor. Exploring effective prevention and control measures a large short-circuit current, which will burn the commutation. .
It is imperative to use the Lingqiu area in the Taiyuan North Locomotive Depot for many years. The oil used to be accompanied by the hustle and bustle of the boat, and the sound of the Zhou Niu æ» æ» ç¢´ 碴 æ» , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,
Increase the tensile strength of a single bolt and actively respond to various line diseases. From the above analysis of the force analysis of the guardrail bolts, merely improving the flexibility of the track bed and reducing the irregularity of the line is not enough to eliminate the damage of the guardrail bolts. It is necessary to improve the bolt material and improve the single bearing capacity of the bolt. Kung Fu, we have adopted the implementation of high-strength screw.
Previously, we tried the diameter of the screw. After the test, the bolts of the general line section were reduced, but the screw was still easy to break in the section where the rail joint was seriously damaged. Considering the characteristics of many bridge and tunnel equipment and high embankment equipment, large guard rail length and large number of bolts, the comprehensive maintenance tools and the actual conditions of the existing accessories keep the screw diameter constant, and the screw strength is required to reach the level above. Directly increase the tensile force of a single bolt.
After the trial on the road, the effect is very good. The high-strength screw does not break even in the empty hanging area of ​​the line or in the severely damaged section of the rail joint. Although the maintenance cost is increased at one time, the labor and material investment can be reduced for a long time, and the maintenance cost is reduced in the long run.
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