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本文以NB_8-600泵为例,分析了泵头破坏的主要原因及预防措施,指出最容易破坏的部位是左泵头的上水阀箱5(见图1)与液缸之间弯道内侧壁B。对于泵头的修复,以采用镶套为主,堆焊为辅的工艺方法。应用此法至少可延长使用寿命2～3倍,尤其是在阀箱口密封部位上镶套,会使现场修理泵头的工作量减少40％～50％。该修复工艺已推广到2PN-1258泵、3NB80A泵和3NBl000泵的修理中。
In this paper, the NB_8-600 pump is taken as an example to analyze the main reason and precautionary measures of the pump head failure. It is pointed out that the most vulnerable part is the inside of the curve between the upper pump box 5 (see Figure 1) and the cylinder of the left pump head Wall B. For the repair of the pump head, in order to use set-based, supplemented by welding process. Application of this method can extend the life of at least 2 to 3 times, especially in the valve box mouth sealing parts set, will reduce the workload of on-site repair pump head 40% to 50%. This repair process has been extended to the repair of 2PN-1258, 3NB80A and 3NBl000 pumps.