外文资料及翻译

外文资料原文

High Productivity —A Question of Shearer Loader

Cutting Sequences

K. Nienhaus, A. K. Bayer & H. Haut, Aachen University of

Technology, GER

R ecent l y, t he focus in underground longwal l coal mi ni ng has been on i ncreasi ng t he inst al l ed m ot or power of s hearer loaders and armoured face conve yors (AFC), m ore sophi st i cat ed support cont rol s yst em s and l onger face l engt h, in or der to reduce cos ts and achi eve hi gher producti vi t y. These efforts have res ul t ed i n hi ghe r out put and previ ousl y uns een face advance rat es. The t rend t owards“bi gger and bet t er” equi pm ent and l a yout schem es, however, i s rapi dl y neari ng the li mi t at i ons of t echni cal and economi cal feasi bi li t y.To reali se furt her producti vi t y i ncre as es, organi sat ional changes of l ongwall m i ni ng procedures l ooks l ike the onl y r easonabl e ans wer. The benefit s of opt i-m is ed s hearer loader cutt i ng sequences, l eadi ng t o bett er perform ance, are di s cus sed i n t hi s paper.

Introductions

Tradi ti onal l y, i n underground l ongwal l m i ni ng operati ons, s hearer

loaders produce coal usi ng ei ther one of t he fol lowi ng cutt ing

s equences: uni-di recti onal or bi-di recti onal c ycl es. Besi des t hese

pre-domi nant m ethods, al t ernat i ve mi ni ng c ycl es have al so been

devel oped and s uccessfull y appli ed in underground hard coal mi nes al l over t he worl d. The hal f-web cut ti ng c ycl e as e.g. uti liz ed i n R AG Coal Int ernati onal’s Twent ym i l e Mine in Colorado, US A, and t he

“Opt i-C ycl e” of M atl a’s S out h Afri can short wal l operati on m ust be

m enti oned i n t hi s cont ext. Ot her mi nes have al so t est ed s i mi l ar but modi fi ed cut ti ng c ycl es res ul ti ng i n i m proved out put, e.g.

im provem ent s i n t erms of product iv-it y i ncreas es of up to 40 % are thought possi bl e。

Whereas t he m enti oned mi nes are appl yi n g t he al t ernat i ve cut ti ng m et hods accordi ng to thei r spe-ci fi c condi ti ons, –e.g. s eam hei ght or equi pm ent used, –t hi s paper looks s ys t em at i call y at t he di ffer-ent

m et hods from a generali s ed poi nt of vi ew. A det ail ed des cripti on of t he mi ni ng c ycl e for ea ch cut ti ng t echni que, i ncluding t he i ll us t rati on of producti ve and non-prod ucti ve c ycl e ti m es, wi ll be foll owed b y a bri ef present ati on of t he perform ed product i on capacit y cal cul ati on and a summ ar y of t he t echni cal res t ri ct ions of each s ys t em. S t andardi sed equi pm ent cl as ses for di fferent seam hei ghts are defined, aft er the m ost