Mashiinada kubbadda ayaa ah qalab muhiim ah oo ka tirsan warshadaha macdanta iyo habaynta macdanta, waxaana loo isticmaalaa in lagu burburiyo walxaha si ay u noqdaan budo adag. Xawaaraha wareegga, ama RPM (wareegyo daqiiqaddiiba), waa arrin muhiim ah oo saameyn ku leh waxtarka iyo hufnaanta habka milka. Maqaalkani wuxuu baarayaa sida loo go'aamiyo RPM-ka ugu habboon ee mashiinka kubbadda oo leh dhexroor 45-inji.
Ka hor inta aan lagu xisaabin RPM-ka ugu fiican, waxaa muhiim ah in la fahmo farsamada mashiinka bacda:
– Xabaash: Jirka silindariga ah ee mashiinka.
– Kubadaha: Qalabka burburinaya iyo meelaysa walxaha.
– Mishiinka: Waxay awoodiisa siisaa wareegga mishiinka.
- Waxyaabaha ayaa lagu shubaa mashiinka.
– Kubaduhu waxay saameyn ku yeeshaan oo waxay shiidiyaan maaddada.
- Xawaaraha wareegga wuxuu saameeyaa waxtarka miridhku.
Waxaa jira arrimo dhowr ah oo la tixgelinayo marka la go'aaminayo RPM ee mashiinka kubbadda:
Xawaaraha muhiimka ah ee mashruuca kubbadda waxaa lagu xisaabin karaa iyadoo la adeegsanayo qaaciddadan:
\[ \text{Xawaaraha Muhiimka ah (C)} = \frac{76.6}{\sqrt{D}} \]
Halkee:
For a 45-inch diameter mill: Dhererka 45-inji ee milka:
\[ C = \frac{76.6}{\sqrt{3.75}} \approx 39.5 \, \text{RPM} \]
Caadi ahaan, mashaariicda kubadaha waxay ka shaqeeyaan 65% ilaa 75% xawaaraha muhiimka ah si loo xaqiijiyo qashin wanaagsan oo looga fogaado xirashada xad-dhaafka ah. Sidaa daraadeed, mishiinka le'eg 45-inji:
– Minimaal: \( 0.65 \times 39.5 \approx 25.7 \, \text{RPM} \)
– Ugu badnaan: \( 0.75 \times 39.5 \approx 29.6 \, \text{RPM} \)
Marka la dejinayo RPM (wareegyada daqiiqaddii) ee mishiinka kubbadda, tixgeli arrimaha wax ku oolka ah ee soo socda:
Go'aaminta RPM-ka ugu habboon ee mishiinka kubbadda waxay ku lug leedahay fahamka xawaaraha muhiimka ah iyo hagaajinta tixgelinno dhaqameed. Mishiin leh dhexroor 45-inji ah, hawlgelinta inta u dhaxaysa 25.7 RPM iyo 29.6 RPM ayaa lagu talinayaa si loo isku dheeli tirto waxtarka iyo xirashada. Had iyo jeer tixgeli maaddada gaarka ah iyo natiijada la rabo marka la dejinayo RPM si loo hubiyo waxqabadka ugu habboon.
