【正文】
~ 48 176。 M for cutting the head of the rated torque. Cut the feeding of (axial thrust) R。 σ c ≤ 60MPa, V = 2 ~ / s, σ c 60MPa. V = l ~ 2m / s. But eventually cutting speed by cutting technology to determine. dynamic parameters Roadheaderdriven power sources are used Motors. Cutting power body size. In fact the general use of analogy, bined with roadheader some personality and experience factors to determine. Roadheader in the operating process, the vertical axis and the horizontal axisof the need for adequate cutting edge and push forward swing (horizontal and vertical) force. According to Russia (the former Soviet Union) in the laboratory test results that the cutting of coal and rock platts hardness f = 4 ~ 6 (equivalent to 0 C = 40 ~ 60MPa), grinding coefficient F = 5 ~ 7mg/mm2. Cutting the shaking force (traction) Pv = (1 ~ ) P, P = M / Rcp, in the Pcutting head for the average cutting edge。 can also be Roadheader with reference to the existing analog method to determine , machine(t) and cutting power (kW) ratio of to . For general coal, rock bottom, the allowable value ≤ MPa。 Heavyweight, poor mobility, flexibility to decline. The selfrespect as it may be w = (t) estimates, in the Ntype body for cutting power, kW。 small size, light weight. A 10 KW gear around the weight of motor oil, with the only major power lowspeed torque motor of 1 / 18, the weight of the motor 1 / 13. Gear used motor oil, although lowerspeed reducer size large torque motor, but a small electric (MRHS5013type plane reducer transmission ratio i = 328). So can easily be motors, reducers, hydraulic Zhidong Fa, tight chain devices installed in the middletracked. In this way than on the technical performance of mechanical transmission, the economic indicators better than the lowspeed torque motor drive. So has a unique advantage. The walking speed in two ways: one is a variable pump. The other is the use or diversion of the flow and speed control programmes, such as the MRHS5013 type aircraft, that is, in the rapid mobilization of machinery, to stop carrying motor oil, only to run motor oil so that the boring machine has two Walking speed. 3 determination plete machine main technology senate parameter Mechanical Roadheader plete machine main technical parameter including size senate parameter (length width highly)。 3) reliability of the work: the transmission system reliability performance for the life of ponents, as well as ponent quality requirements。s attention. types and power transmission ponents choice transmission patterns and ponents should follow the principle of choice 1) the advanced nature of technology: machines to improve performance, increase productivity。s attention, what good control of their machines, cutting out the rules of the roadway。 3) the level of cantilever and vertical position can swing the center coincidence, can not overlap. From the increased stability of the machine, these are highly swing should be reduced. In the cantilever is not guaranteed to interfere with other agencies under the conditions of swing ce ntres are located should try to rely on, but must ensure that the machines in the centre plane of vertical symmetry。 5) examination of moving parts of the movement space, rule out the possibility of interference in the campaign. specific requirements Boring machine in the general layout, the need to pay attention to the following questions: 1) institutions into the reducer reducer, as far as possible to coax axis。 4) layout of the manipulation of institutions, the driver39。 2) To identify the parts, ponents and the connections between plete machine。同時(shí),應(yīng)廣泛學(xué)習(xí)國際上這方面的新設(shè) 計(jì)方法為我所用, 提高我們的設(shè)計(jì)水平, 積累我們的設(shè)計(jì)經(jīng)驗(yàn), 搞出安全、 可靠、 性能優(yōu)良的高端產(chǎn)品。 它的設(shè)計(jì)關(guān) 鍵是總體性能參數(shù)的合理選擇,各個(gè)系統(tǒng)和總成的優(yōu)化設(shè)計(jì)水平,特別是截割機(jī) 構(gòu)的切割技術(shù)顯得尤為重要。 5)繪制截割巷道斷面圖。 3)液壓系統(tǒng)熱平衡的計(jì)算。 1)掘進(jìn)機(jī)截割機(jī)構(gòu)動靜態(tài)穩(wěn)定性的計(jì)算。 2)內(nèi)外噴霧 系統(tǒng)總水量不得超過掘進(jìn)機(jī)實(shí)際生能力的 6~ 8%,否則造成工 作面煤泥積水現(xiàn)象。 內(nèi)噴霧系統(tǒng)的噴嘴裝置設(shè)在截割頭截齒座的后面內(nèi)噴霧系統(tǒng)的壓力不低于 4MPa。動力部分回路中的電器元件應(yīng)滿足供 電電的波動范圍 70%~ 115%的要求。 系統(tǒng)中每個(gè)回路的溢流閥調(diào)定壓力為其額定壓力 的 ~ 倍為宜。在系統(tǒng)有液壓馬達(dá)傳動動力時(shí)應(yīng)設(shè)置冷卻器,系統(tǒng)中選用串 聯(lián)輪泵時(shí),額定壓力宣在 20MPa 以下。 4) 液壓系統(tǒng)技術(shù)參數(shù)的確定 液壓系統(tǒng)的技術(shù)參數(shù)的確定應(yīng)在液壓設(shè)計(jì)計(jì)算后定。重型和特重型掘進(jìn)機(jī)推薦采用這種結(jié)構(gòu)型式。 結(jié)構(gòu)型式有滑動和 滾動兩種 ,滑動式結(jié)構(gòu)簡單,內(nèi)阻較大,對特輕型、輕 型、中型掘進(jìn)機(jī)推薦采用滑動結(jié)構(gòu)式。 一般只能確定一種行走速度 5~ / min。 3)行走履 帶技術(shù)參數(shù)的確定和連接關(guān)系 , 總體設(shè)計(jì)和總體布置時(shí)確定其中 一種。如機(jī)尾需要左右擺動時(shí),必須采 用一條美國萬向套筒滾子鏈, 在轉(zhuǎn)向位置的一側(cè)設(shè)置單作用液壓缸實(shí)現(xiàn)機(jī)尾左右 擺動 45176。它 的寬度應(yīng)比履帶外寬大 ~ ,下降最低位置 不應(yīng)小于臥底深度上升最大高 度應(yīng)達(dá)到 350~400mm。鏟煤板的傾斜角一般為 21176。星輪的轉(zhuǎn)速可略高一些。如用戶對懸臂不要求有伸縮結(jié)構(gòu),一般不推薦采用。 (2)截割機(jī)構(gòu)的連接 截割機(jī)構(gòu)懸臂安裝在叉形架前端,叉形架固定在回轉(zhuǎn)臺上,回轉(zhuǎn)臺固定在機(jī) 架上。 平均單刀力應(yīng)達(dá)到: 級煤巖 F≥ 2500N, 級煤巖 F≥ 5000N, f4 f6 f8 級煤巖 F≥ 12020N,截齒安裝角最佳為 45176。 截割頭轉(zhuǎn)速 n=20~65r/ min, 截齒尖的平均截割速度 V=1. 5~2. 5m / s,截割擺動速度 Vn=~ l0m/ s。 。 5)技術(shù)經(jīng)濟(jì)指標(biāo) Q=(m3/min),式中 sx 為截割頭的縱向橫截面積, m2: Vn 為截割頭的截割擺 動速度, m/min。截割時(shí)的擺動力 (牽 引力 )Pv=(1~1. 34)P, P=M/ Rcp,式中 P 為截割頭上的平均截割力; Rcp 為截 割頭平均半徑; 為截割頭上的額定扭矩。 掘進(jìn)機(jī)在作業(yè)過程中,縱軸式和橫軸式部需要足夠的掏槽推進(jìn)力和擺動 (水 平方向和垂直方向 )力。截割機(jī)構(gòu)功率大 小。 但最終切割速度由切割技術(shù)來確定。 巖底板, 許用值 ≤ ; 對于水軟化的泥質(zhì)頁巖底板, ≤ 0. 05MPa。 2)重量參數(shù) 整機(jī)自重是掘進(jìn)機(jī)的 — 個(gè)重要參數(shù),機(jī)重太輕,工作穩(wěn)定性下降,擺動截割 時(shí)會發(fā)生擺尾現(xiàn)象、截割效率下降,截齒磨耗率增加;機(jī)重太重時(shí),機(jī)動性差, 轉(zhuǎn)向靈活性下降。臥底深度 250~400mm,離地間隙 C=B/13+84(mm), B 為兩 履帶中心距 )。當(dāng)今中外機(jī)型發(fā)展趨勢是矮機(jī)型,中、重型機(jī)高度 ~ 2m,特輕 型、輕型機(jī)的高度 ~ 。 1)尺寸參數(shù) 整機(jī)長度、寬度的大小直接與其轉(zhuǎn)彎半徑有關(guān),推薦輕型機(jī)長度≤ 7. 5m, 中型機(jī)長度≤ 8. 5m,重型機(jī)≤ l0m,對應(yīng)的寬度分別為≤ ,≤ ,≤ 3m。另一種是采用分流或并流 的調(diào)速方案,如 MRHS5013 型機(jī),即在機(jī)器快速調(diào)動時(shí),停止向裝載馬達(dá)供油, 僅向行走馬達(dá)供油,使掘進(jìn)機(jī)有兩種行走速度。 因此具有獨(dú)特的優(yōu)點(diǎn)。因此可方便地將馬 達(dá)、減速器、液壓制動閥、緊鏈裝置等安裝于履帶架中間。 一臺 10KW 左右齒輪油馬達(dá)的重量,僅為同功率低速大扭矩馬達(dá)的 1/18,為電動 機(jī)重量的 1/13。但液壓馬達(dá)傳動復(fù)雜、制造費(fèi)用高,維護(hù)較難。液壓傳 動的行走機(jī)構(gòu)中,在液壓馬 達(dá)型式選擇及調(diào)速方式設(shè)計(jì)方面,有不同的方案。這種傳動方式傳動可靠性高,電動機(jī)價(jià)格低,維修 容易,但不能調(diào)速,減速箱體積較大,巷道淋水大時(shí),電動機(jī)易受潮而燒毀。分別通過 機(jī)械減速裝置或直接由油馬達(dá)帶動履帶的主動鏈輪運(yùn)轉(zhuǎn)。 耙裝、輸送機(jī)構(gòu)若采用齒輪油馬達(dá)傳動,由于尺寸小、重量輕,可使二者分 別傳動,從而簡化傳動裝置,便于在鏟板下布 置,便于設(shè)計(jì)密封效果好的機(jī)械密 封或?qū)p速器與鏟板分離,同時(shí)可實(shí)現(xiàn)過載自動保護(hù)。 耙裝、輸送機(jī)構(gòu)若采用機(jī)械傳動,用于電動機(jī)尺寸較大,不便在輸送機(jī)尾安 裝,