在冶金、矿山及化工等企业应用的螺旋输送机，其轴端压盖广泛采用填料密封。由于煤粉粒度为200目，呈细粉状，并有一定的流动性，因此常因输送机的头部轴端密封不严，泄漏许多煤粉。用过石棉盘根、油浸羊毛毡、油浸石棉绳及柔性石墨环等作为密封填料，但治漏效果均不理想。每天设备周围都泄漏出煤粉，既浪费，又污染环境，影响文明生产。
在输送机上作试验，即在头部填料压盖的法兰外圈上钻通孔、攻丝、加装油嘴，在压盖孔壁内加工两条油槽与油嘴孔连通。用黄油枪从油嘴处压入润滑脂，并使之进入油槽，填满旋转轴表面与压盖内孔间的配合间隙，原有的石棉盘根保持不变，这种结构使煤粉经过多次密封，达到了良好的密封效果。经现场试验，加装油嘴的输送机明显的优于未改造的。
通过实践证明，这种方法是行之有效的，可延长螺旋轴使用寿命。但尚需注意以下两点：
1.压盖内必须每3—4天加注一次润滑油脂，否则油脂消耗完或者干涸仍会泄漏煤粉。
2.在每次装拆后，开机运行一个月左右需拧紧压盖螺检，使盘根与轴紧密贴合。但不必压得过紧，以后可根据实际情况调正压盖螺栓。
中译英：
In the metallurgical, mining and chemical enterprise application of the screw conveyor, the shaft end cover is widely used in packing seal. As a result of coal particle size is 200 mesh, a fine powder, and a certain mobility, so often because the conveyor head shaft end sealing, leakage many pulverized coal. Used asbestos packing, oil-immersed sheep blankets, asbestos rope and flexible graphite ring such as packing, but the effect is not ideal for leakage control. Every device around the leaking out of pulverized coal, waste, and environmental pollution, affect the civilization production.
On the conveyor for tests, namely, at the head of the packing gland flange on the outer ring of the through holes, tapping, adding nozzle, in the hole of the press cover wall two processing oil groove and oil nozzle hole. Use grease gun from the tip of the nozzle is pressed into the grease, and make it into the oil tank, fill the rotation axis surface and the cover hole of fit clearance between, the original asbestos packing remained unchanged, the structure of the coal after many seal, to achieve a good seal effect. Through field test, adding nozzle conveyor is obviously better than the original.
Proved by practice, this method is effective, can prolong the service life of the spiral shaft. But still need to pay attention to the following two points:
1 gland must be every 3 to 4 days with a lubricating oil or grease, consumed or dry pulverized coal will still leak.
2 at the end of each assembly and disassembly, start to run a month need to tighten gland bolt, so that the packing and the shaft tightly. But need not be pressed too tight, then according to the actual situation of adjusting cap bolt.
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