CAPACITY OF NEX-SERIES GEARBOX FOR SINGLE EXTRUDER

TABLE 1
TABLE 2

TYPE	NOMINAL TORQUE(NxM)
	REDUCTION STAGE	NOMINAL RATIO
	REDUCTION STAGE	8	10	12	16	20	25	30
NEX-112-3S	DOUBLE	1300	1300	1300	1000	1000	1000	700
NEX-125-3S	DOUBLE	1650	1650	1650	1250	1250	1250	900
NEX-140-3S	DOUBLE	2750	2750	2750	2100	2100	2100	1400
NEX-160-3S	DOUBLE	3900	3900	3900	3000	3000	3000	2300
NEX-180-3S	DOUBLE	6100	6100	6100	4650	4650	4650	3250
NEX-200-3S	DOUBLE	9500	9500	9500	7200	7200	7200	5000
NEX-225-3S	DOUBLE	14500	14500	14500	11000	11000	11000	7700
NEX-250-3S	DOUBLE	19000	19000	19000	14500	14500	14500	10000
NEX-280-3S	DOUBLE	23500	23500	23500	17500	17500	17500	12500
NEX-320-3S	DOUBLE	38000	38000	38000	28500	28500	28500	20000
NEX-360-3S	DOUBLE	53500	53500	53500	40500	40500	40500	28500
NEX-400-3S	DOUBLE	79000	79000	79000	60000	60000	60000	42000

TYPE	TRUST-BEARING	NOMINAL THERMAL CAPACITY	SCREW DIAMETER	WEIGHT(KG)
NEX-112-3S	29413_EX	5 KW	Ø25-Ø35	85
NEX-125-3S	29415_EX	7.5 KW	Ø35-Ø45	118
NEX-140-3S	29417_EX	15 KW	Ø45-Ø50	165
NEX-160-3S	29420_EX	22 KW	Ø50-Ø65	210
NEX-180-3S	29424_EX	30 KW	Ø65-Ø75	325
NEX-200-3S	29426_EX	37 KW	Ø75-Ø85	490
NEX-225-3S	29428_EX	56 KW	Ø90-Ø100	616
NEX-250-3S	29432_EX	75 KW	Ø100-Ø110	820
NEX-280-3S	29436_E	94 KW	Ø110-Ø120	1205
NEX-320-3S	29440_E	112 KW	Ø120-Ø130	1608
NEX-360-3S	29444_E	150 KW	Ø130-Ø150	2145
NEX-400-3S	29452_E	187 KW	Ø150-Ø200	2720

OPTION

Triangular pump
Independent motor pump
Equipment of oil sight value & Brass tube
Oil filter
Internal cooling tube
Tube & shell heat exchanger

NOTE

The safety factor of gear strength over than 1.6.
The safety factor is according to DIN3990-B gear design standard.
The trust-bearing can be chance for different purpose.
The material of pionion is SNCM220, the material of gear is SCM415 and they are all from Janpan.
The gear ratio can select triple reduction in the same type.

How to Choose Right Gear box ?

STEP 1

Select nominal ratio ” i “ ( see table 2)

Example:
Input speed n1 = 1750 rpm ;
Screw speed n2 = 100 rpm
Required ratio iʳ = n1 / n2 = 17.5
Closest available ratio i = 20

STEP 2

Calculate output torque
Required Gearbox Output Torque ( Tʳ )
Tʳ(Nm) = p2 x 9550 / n2

Example:
Power of Drive motor : P2 = 75kW
Required Gearbox Output Torque( Tʳ ):
Tʳ=75*9550/100=7162.5 Nm

STEP 3

Select Gear Unit type and size (see table 2)

Example:
Nominal torque : T= 7200 ≥ Tʳ=7162.5 Nm
Select model NEX-200 (see table 2) to be
proper one!!

STEP 4

Determine Required Thermal Capacity
(see table1)
(I) P > P2；Nominal thermal capacity (P)
> Power of Drive motor (P2)
Thermal capacity of gearbox is sufficient.
(II) P < P2；Nominal thermal capacity (P)
< Power of Drive motor (P2)
Additional cooling system is required.

Example:
Choose Model NEX-200 (see table 1):
P (37kW) < P2 (75kW)
Additional cooling system is required