BẢNG TÍNH & QUY ĐỔI - Các đơn vị tính của hệ thống thủy lực (Hydraulic Formula Calculator)
HYDRAULIC WORKSHOP FORMULAE.
CYLINDER FORCE ; IN KILOGRAMS (KG)
Kg = AREA X PRESSURE = DIAMETER (cm) X DIAMETER (cm) X PRESSURE (bar) X 3.14
Kg= 10.1 cm X 10.1 cm X 180 Bar X 3.14 ÷ 4 = 14414 Kg
tons= Kg ÷ 1000
14414 Kg ÷ 1000 = 14.41 tons
CYLINDER CAPACITY FLOW RATE ; IN LITRE
L/min = AREA X SPEED = DIAMETER (cm) X DIAMETER (cm) X SPEED (m/s) X 4.71
L/min = 10.1 cm X 10.1 cm X .02 m/s X 4.71 = 9 L/min
CYLINDER SHAFT SPEED ; IN MILLIMETERS PER SEC (M/S)
m/s = FLOW RATE ÷ AREA = FLOW RATE ( L/min) ÷ DIAMETER (cm) ÷ DIAMETER (cm) X 0.21
m/s = 9 L/min ÷ 10.1 cm ÷ 10.1 cm X .21 = .02 m/s = 20 mm/s
CYLINDER STROKE TIME ; IN SECONDS PER STROKE
sec = STROKE LENGTH (cm) ÷ SPEED (m/s) ÷ 100
sec = 10 cm ÷ .02 m/s ÷ 100 = 5 sec
PUMP FLOW : IN LITRES PER MINUTE (L/min)
L/min = cc / Rev X RPM ÷ 1000
L/min = 14 cc/Rev X 1450 RPM ÷ 1000 = 20.3 L/min
PUMP INPUT POWER ; IN KILOWATTS (MILLIMETERS)
Kw = FLOW X PRESSURE ÷ 600 ÷ 0.85
Kw = 20 LITRES X 180 Bar ÷ 600 ÷ 0.85 = 7 KW (KILOWATT)
MOTOR TORQUE ; IN NEWTON METER (Nm)
Nm = PRESSURE (MPa) X FLOW (L/min) X 159 ÷ RPM
Nm = 21 MPa X 9 L/min X 159 ÷ 1450 RPM = 20.72 Nm
MOTOR TORQUE ; IN NEWTON METER (Nm)
Nm = PRESSURE (MPa) X DISPLACEMENT (cm X cm) ÷ 6.28
Nm = 21 MPa X 10 cm² ÷ 6.28 = 33.44 Nm
PUMP SHAFT PL FACTOR ; IN TORQUE NEWTON METER (Nm)
Nm = cc / Rev X bar/ 57.2 = Nm ( NEWTON METER )
Nm = 14 cc / Rev X 140 bar ÷ 57.2 = 34 Nm
CONVERSION FACTORS
1 Kw = 1.34 HP
1 HP = 0.75 Kw
1 Kw = 1000 Watts
1000 Kg = 1 TON METRIC
1 KILOGRAM = 2.2 Lbs
1 NEWTON METER ( nm ) = 8.9 in-Lbs.
1 NEWTON METER (nm) = 0.74 ft-Lbs.
10 NEWTON METERS (nm) = 1 Dnm
1 US Gal = 3.79 Litre
1 Imp. Gallon = 4.5 LITRE
1 cu Inch = 16.4 cc
1 Inch = 25.4mm
1 METER = 39.4 Inch
0.01 mm = 4 thousands of an Inch
1 bar = 14.5 PSI
1 MPA = 10 bar
1 bar = 100 Kpa
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HYDRAULIC WORKSHOP FORMULAE.
CYLINDER FORCE ; IN KILOGRAMS (KG)
Kg = AREA X PRESSURE = DIAMETER (cm) X DIAMETER (cm) X PRESSURE (bar) X 3.14
Kg= 10.1 cm X 10.1 cm X 180 Bar X 3.14 ÷ 4 = 14414 Kg
tons= Kg ÷ 1000
14414 Kg ÷ 1000 = 14.41 tons
CYLINDER CAPACITY FLOW RATE ; IN LITRE
L/min = AREA X SPEED = DIAMETER (cm) X DIAMETER (cm) X SPEED (m/s) X 4.71
L/min = 10.1 cm X 10.1 cm X .02 m/s X 4.71 = 9 L/min
CYLINDER SHAFT SPEED ; IN MILLIMETERS PER SEC (M/S)
m/s = FLOW RATE ÷ AREA = FLOW RATE ( L/min) ÷ DIAMETER (cm) ÷ DIAMETER (cm) X 0.21
m/s = 9 L/min ÷ 10.1 cm ÷ 10.1 cm X .21 = .02 m/s = 20 mm/s
CYLINDER STROKE TIME ; IN SECONDS PER STROKE
sec = STROKE LENGTH (cm) ÷ SPEED (m/s) ÷ 100
sec = 10 cm ÷ .02 m/s ÷ 100 = 5 sec
PUMP FLOW : IN LITRES PER MINUTE (L/min)
L/min = cc / Rev X RPM ÷ 1000
L/min = 14 cc/Rev X 1450 RPM ÷ 1000 = 20.3 L/min
PUMP INPUT POWER ; IN KILOWATTS (MILLIMETERS)
Kw = FLOW X PRESSURE ÷ 600 ÷ 0.85
Kw = 20 LITRES X 180 Bar ÷ 600 ÷ 0.85 = 7 KW (KILOWATT)
MOTOR TORQUE ; IN NEWTON METER (Nm)
Nm = PRESSURE (MPa) X FLOW (L/min) X 159 ÷ RPM
Nm = 21 MPa X 9 L/min X 159 ÷ 1450 RPM = 20.72 Nm
MOTOR TORQUE ; IN NEWTON METER (Nm)
Nm = PRESSURE (MPa) X DISPLACEMENT (cm X cm) ÷ 6.28
Nm = 21 MPa X 10 cm² ÷ 6.28 = 33.44 Nm
PUMP SHAFT PL FACTOR ; IN TORQUE NEWTON METER (Nm)
Nm = cc / Rev X bar/ 57.2 = Nm ( NEWTON METER )
Nm = 14 cc / Rev X 140 bar ÷ 57.2 = 34 Nm
CONVERSION FACTORS
1 Kw = 1.34 HP
1 HP = 0.75 Kw
1 Kw = 1000 Watts
1000 Kg = 1 TON METRIC
1 KILOGRAM = 2.2 Lbs
1 NEWTON METER ( nm ) = 8.9 in-Lbs.
1 NEWTON METER (nm) = 0.74 ft-Lbs.
10 NEWTON METERS (nm) = 1 Dnm
1 US Gal = 3.79 Litre
1 Imp. Gallon = 4.5 LITRE
1 cu Inch = 16.4 cc
1 Inch = 25.4mm
1 METER = 39.4 Inch
0.01 mm = 4 thousands of an Inch
1 bar = 14.5 PSI
1 MPA = 10 bar
1 bar = 100 Kpa
LINK DOWNLOAD
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