About DC - 32 axle box baffle the gasket and the bolt improvement program

About DC - 32 axle box baffle the gasket and the bolt 2018 - improvement scheme 07 - 09 Xu Weiping I shop rack trim disassembling 08 - in years And the WD - 32 tamping car 320 in the process of the damper under the steady car axle box found the following problems: the baffle fastening bolt looseness: root cause analysis: a big machine axle box is kunming factory baffle fastening bolt not split pin against pine; Second, the big machine has the axle in the process of annual repair test calibration support adjustment in place, axle under the condition of building support cylinder pressure, the lower edge of the axle box and the periods of a newspaper can pass between baffle; But in the process of construction, should be timely check the adjustment of axle under construction support cylinder pressure under the condition of the lower edge of the axle box and the gap between the baffle, if found too little clearance should be adjusted in time. Because the individual does not reach the designated position, adjusting axle shaft construction support cylinder pressure under the condition of axle box baffle with long hours, high load pressure, easy to cause the fastening bolt fatigue damage, even fracture, but also led to a fastening nut loose easily; Three is a large machine after long hang to the construction site, installation of the shaft power is restored, need jacking bogie, disc wheel on, para shaft bolt flange Angle position, in general, one thousand jins bumps brace position is located in the axle box at the bottom of the baffle, the resulting round all the weight through the axle box damper bolt stress, lead to deformation of the gasket. Damper under the bolt strength of flat washer is not enough, the stress after bending deformation, affecting the effects of fastening, at the same time, every time to replace the maintenance process, increases the maintenance spare parts cost. On both sides of axle box isolation plate thickness uneven, axle box clearance is inconsistent. Make the same bogie with isolation plate processing error under four baffle height is not consistent, cannot satisfy the damper under pressure in a state of axle box and 12 to 15 mm clearance requirement, affected the quality of maintenance. Due to above problems seriously affected the large machine precision of long distance transport safety, construction and operation safety, the improvement project of my workshop is proposed as follows: the baffle fastening bolt tail punching, adding split pin, prevent damper under the loss caused by the lock nut is loose. Tinkering with fastening bolt flat washer specifications, prototype gasket thickness is 3 mm, because of insufficient strength, now change thickness is 5 mm, material of 50 # steel special gaskets, by appropriate test the gasket strength and thickness, won't produce deformation in use, the tear open outfit is convenient, also can be repeated use. Adding thickness to 1 mm damper under the M type of isolation plate gaskets, by M type gasket to adjust the clearance of the axle box and the baffle, strengthened the bolt fastening effect at the same time, the trial showed that the precision of M type adjustment gasket is better, tear open outfit is very convenient. Below is contrast figure before and after improvement, so that both fastening solutions for improvement of the gasket thickness and strength test, the test shows that the right side of the 3 mm, 45 # steel washer easily bend under pressure, and use the left side of the 5 mm, after 50 # steel gasket strength can meet the requirements. Fastening the gasket obvious deformation before improvement, loose lock nut bearing is easy to fall off. The improved replacement washer, increasing the cotter pin, effectively avoid fall off the lock nut. After decomposition of fastening the gasket has obvious rolling traces, and have been bending deformation, fastening effect is greatly reduced, left a serious security hidden danger. It is in use in the improvements of bolts, washers, and punch.