第二十一节 翻斗机
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“拿去检验吧。”展无涯看着完工的一段链条，“做拉力测试。”
“我去主持。”孙立说。
“好，从严把关！这可是我们自个的事情，不是糊弄客户。”
“当然。”孙立说，“走吧，去试验场！”
一直在旁跟班学习的几个归化民技工应了一声，抬起链子就往外走。女徒弟给展无涯递上一大搪瓷杯的茶水，又送上毛巾。展无涯一口气喝了大半杯，又擦了擦汗。关照女徒工给大家拿几瓶盐汽水来。
“再拿两包烟来！”
几个元老蹲在热处理车间门口抽烟，等待检验结果――车间里不许抽烟这是展无涯定下的规矩。女徒弟赶紧端来几个小板凳。虽说主要有归化民工人动手，但是几个元老差不多每个步骤都在旁边监督指导，连轴干了二天二夜。每个人的眼睛都红红的。
不大的功夫，孙立笑容满面的回来了：“蛋！成功！”
几个人呼啦一下都站了起来，展无涯有点激动，又问了一遍：“试验情况怎么样？”
“按照翻斗机的实际工作状况做了拉力测试，完全通过。加码到120％才断裂。”孙立说，“我看可以马上再做翻斗机的全机测试了！”
“好好，这一次试验通过赶快编制工艺手册，开始量产。”展无涯很是激动，矿山链是现在的急需产品――大规模的矿山开发几乎都要用到矿山链。有了制造高强度矿山链的基础，以后许多工业设备上的链条生产等于就都克服了。
第二次测试获得成功之后，机械总厂又对斗式提升机进行了改进。首先是加装了棘轮机构的防逆转装置。斗式提升机最忌动力中断，升提升过程中其一侧是盛满物料的上行料斗，另一侧是卸完物料的下行空料斗。动力中断后，提升机由于重力作用必然发生逆转。物料随着料斗反转被卸到斗式提升机的底部直到堆满卡住。由于反转是一个加速的运动，很容易扯掉料斗，致使设备损坏。
现代的斗式提升机都是密封的――目的是为了减少提升装卸过程中物料的粉尘飞扬。出于节约材料的考虑，机械总厂设计提升机的时候一开始把这个外壳给省略了，但是在试验过程中大家觉得还是装上比较好――反正一个铁皮壳子也消耗不了多少材料，但是能大幅度减少粉尘污染。工业粉尘造成的职业病本时空的临高医学是毫无办法的。再说铁矿石的粉尘也是铁矿石，积少成多，烧结了一样能炼钢。
但是装了铁皮壳子又出现了新的问题，在试运行中发现密封之后出现了料斗进料和卸料困难，料斗装不满，卸不净。大家赶快再去技术档案室找设计图纸，两下对照发现负责制造提升机密封外壳的钣金车间的车间主任某元老图省事把提升机头部和底部的吸风管、通风口给省却了。
密封壳倒是制作精良，密封可靠，却使得物料的卸料和进料过程中产生了压力差，形成了密封壳内的负压状况。造成装料卸料不畅。通风口使提升机内部压力与外界压力基本相等，而吸风口的作用是通过吸风避免粉尘从通风口溢出，避免浪费和清洁环境。
“教训啊，同志们，这是一个深刻的教训。”展无涯不便公然训斥元老，但是还是忍不住在工作会议上把这个典型敲打了一番，“一种工业设备上的设计，一种工艺手段，都是工业社会中多少年积累下经验教训的直接体现，不是谁想改就可以随便改得！这种不严谨的态度，在工业生产上是要出事的！”
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