2 Agenda • History & Facts • Range & sizes • Pulley programme • Function • Term• Taper Bush• REC V – Belts• Dimensions / tolerances• Catalogue – JOYRO PulleysAdvantages• Weight reduction• Design• Startup Energy• Small Tension• Increased speed• Reduced belt temperature• Balancing• Samples• Features of the JOYRO Pulley
3 History - facts History : 2007 JOYRO Pulley design. Prototypes and load tests.First JOYRO Pulley on the market.Additional tests : Temperature, wear, noise …etc.Produced by Joy and Happiness ., LTD.Today :• Main applications :• Compressors,• Ventilating plants / Air conditioning,• Paper mills,• Agriculture…etc.• Main Customers :Samsung Electronics, Samsung Techwin, LG Chemical, LG Display,LG Electronics, SKC, Hyundai Motor Group, Kia Motor Group,…etc.
4 Range & sizes JOYRO® Pulley SG Iron FCD 500 SPZ, SPA, SPB, SPC - Diam mmTraditional PulleyGrey Iron FC 25SPZ, SPA, SPB, SPC - Diam mm
15 Smaller tension in arms Because of the tangentialconnection between arms andhub the tensile stress in thearms will be reduced as thehub is able to rotate fractionsof degrees during the coolingperiod after casting.
16 Increased speed double speed is double power!! Increased speed (test) Setup:5 kW motor (n1 = 3000 rpm)Frequency changerSPA 200-2, SPA 100-2SPB 355-4The SPB mountet as shownwith no belts, and the rotationalspeed n2 is increased to 7400 min-1 ~138 m/s.No damage on pulley, and furthertests were not found expedient.d3 = SPB 355-4d1 = SPA 200-2D2 = SPA 100-2
17 Reduced belt temperature Thermal imaging camera shootingTraditional SPB 250-4(After 2 working hours)JOYRO SPB 250-4(After 2 working hours)
18 Correlation between the belt and the temperature Every 10°C reduced belt temperature =Double life length!!
19 Balancing Standard balancing grade (ISO 1940) : G16 (30m/s) Static / Dynamic balancing (ISO 254) :1,58 x 1011Dm x Bn =v x 60Dm x 10 x -3n =n < n : Static balancing 1n > n : Dynamic balancingSpecial demands regarding balancingcan be arranged!
20 Transferring high power at high revolutions (Compressor customer)Alt.: 1Transmission with regular v-belt pulleysn1 = 1500 min-1P1 = 200kwd1 = SPB 450-8Required output: P = 200 kw , nw = 8000 min-1,Solution:n1 = 1500 min-1d1 = 450 mmnw = 8000 min-1pw = 200kwn2 = nw/4 = 2000 min-1 (Gearbox)n1 = d2/d1 x 2000 min-1d2 = n1/n2 xd1 = 335 mmBelt speed:V = d1 x n1 x p /60= 0,45 x 1500 x p/60 = 35 m/sn2 = 2000 min-1d2 = SPB 335-8Gearboxrequired!
21 Transferring high power at high revolutions (Compressor customer)Alt.: 2Transmission with VTP/SG Iron pulleysn1 = 3000 min-1P1 = 200kwd1 = SPAP = 200 kw , nw = 8000 min-1,P1 = 200 kw , n1 = 3000 min-1, d1 = 0,45 mdw = n1/nw x d1 = 170 mmnw = 8000 min-1pw = 200kwBelt speed:V = d1 x n1 x p /60= 0,45 x 3000 x p/60 = 70 m/sn2 = 8000 min-1d2 = SPAGearboxeliminated!!
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