Φ177 mm PQF连轧管机穿孔机顶杆小车系统故障分析与改进

Failure Investigation on Piercer Plug Bar Carriage System of Φ177 mm PQF Pipe Mill and Improvement Measures

回顾了Φ177 mm PQF连轧管机穿孔机顶杆小车系统的运行情况,提出制约顶杆小车系统运行的设计及维护缺陷:调心轴承膛孔磨损,轴承故障率高;轴套因拆、装导致表面光洁度降低,密封圈易磨损;下滑板磨损超标,降低了小车车轮及轴的使用寿命;前、后滑板磨损超标,顶杆小车振动大,加速了设备损坏;冷却水管频繁断裂,致使顶头冷却不良;车体车轮轴承故障率高。针对上述缺陷制定改进措施:分解顶杆小车时必须测量调心轴承镗孔尺寸并更换轴套;定期对小车前后及下滑板尺寸进行测量,确保滑板磨损量在允许的范围之内;改进水管结构,增加焊接强度;重新选择小车车轮轴承型号;定期检查油位及油脂。

Reviewed in the article is the operation situation of the piercer plug bar carriage of the ФP177 mm PQF pipe mills. Accordingly, the original design and maintenance defects that restraint normal operation of the said carriage system are identified, including wear of the tip bearing boring which causes high failure rate of the bearing itself, mounting/dismounting of the axel sleeve which causes reduction of the surface finishing, and frequent wear of the gasket ring, over-standard wear of the lower sliding plate which reduces the service lives of both the wheel and axel of the carriage; over-standard wear of both the front and rear sliding plates which leads to serious vibration of the carriage, and in turn quickens damage of the equipment; frequent breaking of the cooling water piping which causes poor cooling of the plug, and high failure rate of the carriage wheel bearing and so on. Addressing the above mentioned defects, modification actions are determined such as measuring dimensions of the tip bearing boring, and replacing the axel sleeve when dismantling the carriage, periodically measuring the dimensions of the front and rear sliding plates of the carriage to ensure that the wear is within the permissible range, modifying the cooling water piping structure, and increasing the welding strength thereof, selecting new type of the carriage wheel bearing, and periodically checking the oil level and the grease condition, etc.