在冶金、礦山及化工等企業(yè)應用的螺旋輸送機，其軸端壓蓋廣泛采用填料密封。由于煤粉粒度為200目，呈細粉狀，并有一定的流動性，因此常因輸送機的頭部軸端密封不嚴，泄漏許多煤粉。用過石棉盤根、油浸羊毛氈、油浸石棉繩及柔性石墨環(huán)等作為密封填料，但治漏效果均不理想。每天設備周圍都泄漏出煤粉，既浪費，又污染環(huán)境，影響文明生產。
在輸送機上作試驗，即在頭部填料壓蓋的法蘭外圈上鉆通孔、攻絲、加裝油嘴，在壓蓋孔壁內加工兩條油槽與油嘴孔連通。用黃油槍從油嘴處壓入潤滑脂，并使之進入油槽，填滿旋轉軸表面與壓蓋內孔間的配合間隙，原有的石棉盤根保持不變，這種結構使煤粉經過多次密封，達到了良好的密封效果。經現(xiàn)場試驗，加裝油嘴的輸送機明顯的優(yōu)于未改造的。
通過實踐證明，這種方法是行之有效的，可延長螺旋軸使用壽命。但尚需注意以下兩點：
1.壓蓋內必須每3—4天加注一次潤滑油脂，否則油脂消耗完或者干涸仍會泄漏煤粉。
2.在每次裝拆后，開機運行一個月左右需擰緊壓蓋螺檢，使盤根與軸緊密貼合。但不必壓得過緊，以后可根據(jù)實際情況調正壓蓋螺栓。
中譯英：
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.
(圖/文www.ltfzmj.cn)