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From: The supersonic descent could happen as early as Sunda. The weatheThe balloon will slowly drift to the edge of space at 120,000 feet (Then, I would assume, he will slowly step out onto something resembling an Olympic diving platform. 斜井提升機(jī)設(shè)備選型設(shè)計(jì) 24 Below, the Earth bees the concrete bottom of a swimming pool that he wants to land on, but not too hard. Still, he39。如果我們一味逃避生活中的悲傷,悲傷只會變得更強(qiáng)烈更真實(shí)—— 悲傷原本只是稍縱即逝的情緒,我們卻固執(zhí)地耿耿于懷 By utilizing our breath we soften our experiences. If we dam them up, our lives will stagnate, but when we keep them flowing, we allow more newness and greater experiences to 減緩我們的感受。t start planning... Those years, those days of do, finally, like youth, will end in our life. 此刻,天空是陰暗的,空氣里有著剛下過雨之后的清新因子。想要的,不想要的,界限明確,好像沒有什么可以撼動自己。 Junior high school, thought to have a crush on just means that the real growth, but over the past three years later, his writing of alumni in peace, suddenly found that isn39。s governing body, has also ordered an immediate investigation into the referee39。t appealed against the disciplinary action your employer has taken against you. However, if you win your case, the tribunal may reduce any pensation awarded to you as a result of your failure to appeal. Remember that in most cases you must make an application to an employment tribunal within three months of the date when the event you are plaining about happened. If your application is received after this time limit, the tribunal will not usually accept i. If you are worried about how the time limits apply to you If you are being represented by a solicitor at the tribunal, they may ask you to sign an agreement where you pay their fee out of your pensation if you win the case. This is known as a damagesbased agreement. In England and Wales, your solicitor can39。 查表可選出電動機(jī)型號為 JRQ1488 型號的電動機(jī)。 斜井提升機(jī)設(shè)備選型設(shè)計(jì) 12 (七 )計(jì)算天輪直徑并選擇天輪 三 根據(jù)《煤礦安全規(guī)程》規(guī)定,選擇天輪直徑 (一 ) 對于地面天輪 若鋼絲繩與天輪的圍包角大于 90 度時(shí) Dt≥80d = 80?20= 1600mm (二 ) 對于井下天輪 若鋼絲繩與天輪的圍包角大于 90 度時(shí) Dt≥60d =60 ?20=1200 式中 Dt— 天輪直徑, mm。 。 ?/ _____煤的松散密度; V——— 礦車的有效容積, m3 算出 n1 值為小數(shù)時(shí),應(yīng)圓整為較大整數(shù)。 ht /7220300 ?? ??? ?? tb Aacrnfmsh斜井提升機(jī)設(shè)備選型設(shè)計(jì) 7 ( 2)一次提升量 btTcamrsh A nfTm36003600 ?? kgtb TAcaTmm rnfsh 4375203003600 000 ??? ??????? 式中 T——— 次提升循環(huán)時(shí)間, s。缺點(diǎn)是提升循環(huán)時(shí)間長、提升能力小、每次提升電動機(jī)換向次數(shù)多、操縱復(fù)雜?;诽嵘话悴捎秒p鉤,適用于井筒傾角為 25176。 (一 )斜井串車提升 可分為單鉤與雙鉤串車兩種。并設(shè)計(jì)了提升設(shè)備的控制電路 ,在設(shè)計(jì)中提升機(jī)采用了三相交流繞線式異步電動機(jī)拖動。由于礦井提升設(shè)備服務(wù)年限長、投資大、電耗多(其耗電量一般占礦井總耗電量的 30~ 40%),所以為了降低礦石成本,提高生產(chǎn)的安全可靠性,必須經(jīng)濟(jì)合理地設(shè)計(jì)和使用礦井提升設(shè)備。 ........ 13 (4) 確定提升機(jī)的實(shí)際最大提升速度 ......................................................... 13 四 結(jié)果圖展示 ........................................................................................................ 14 五 階段速度圖 ........................................................................................................ 15 六 總結(jié): ............................................................................................................... 15 斜井提升機(jī)設(shè)備選型設(shè)計(jì) 4 一 提升方式選擇 斜井提升在我國礦井應(yīng)用極其廣泛,它包括斜井串車、斜井箕斗及斜井帶式輸送機(jī)三種提升方式。 (二 )斜井箕斗提升 與串車提升相比,具有提升速度大,生產(chǎn)能力高,容器自重小及裝卸載易實(shí)現(xiàn)自動化等優(yōu)點(diǎn)?!睹禾抗I(yè)設(shè)計(jì)規(guī)定》規(guī)定:大型礦井的主斜井宜采用帶式輸送機(jī)提升。 二 斜井提升設(shè)備的選型計(jì)算 (一 ) 斜井提升設(shè)備選擇計(jì)算的原始資料 An= 30 萬噸(副井為矸石年提升量,最大班數(shù)下井人數(shù),長材料、設(shè)備等輔助提升量); ; LT= 450 米 ; 斜井提升機(jī)設(shè)備選型設(shè)計(jì) 6 β = 25 度; 制度 :年工作日數(shù) br= 300 天 每天工作 20 個(gè)小時(shí) ; :單個(gè)礦車自身質(zhì)量 mz1= 595 千克 ,kg; 單個(gè)礦車載貨量 m1= 1噸 ,kg; 單個(gè)礦車的長度 Lc= 2 米 ,m; ; :斜井串車單鉤甩車場提升系統(tǒng); 級 :3000V 6000V; (二 ) 根據(jù)礦井年產(chǎn)量要求計(jì)算礦車數(shù) ( 1) 1 小時(shí)提升量 tb Aacrnfmsh ? 式中 C———— 提升不均勻系數(shù),有井底煤倉時(shí) C=~,無井底煤倉時(shí) C=;礦井有兩套提升設(shè)備時(shí) C=,只有一套提升設(shè)備時(shí) C=; br—— 年工作日數(shù); t——— 日提升小時(shí)數(shù); An—— 礦井 年產(chǎn)量, t/年; af——— 提升能力富裕數(shù),對于第一水平 af=。 時(shí), =~。 AL ———— 摘鉤點(diǎn)至井架中心的水平距離,取 AL = 3 xL = 48163 ?? 。 斜井提升機(jī)設(shè)備選型設(shè)計(jì) 11 gn fLmfmmQmpzpa )c o s( s i n)c o s) ( s i n(20211 ???? ????? 10)25c (s i )25c )(s i n5951000(5 298000 0000 ?????????= 經(jīng)驗(yàn)算所選鋼絲繩在安全規(guī)程規(guī)定值的,是可以使用的。 (2) 估算電動機(jī)的轉(zhuǎn)速: Divn m? //60? m imr / ?? ??? 式中 i ———— 減速器的傳動比。本次設(shè)計(jì)時(shí)間緊,任務(wù)中 ,加上斜井提升機(jī)設(shè)備選型設(shè)計(jì) 16 我的能力有限以及缺乏經(jīng)驗(yàn),所以缺點(diǎn)和錯(cuò)誤都在所難免,敬請各位老師和單位領(lǐng)導(dǎo)批評指導(dǎo),借以提高我的設(shè)計(jì)能力,適應(yīng)礦井機(jī)械化的需要,使我在今后的工作中不斷的提高。s Premier League match at Chelsea on Sunday. I am going to be at the match tomorrow and I have asked to m