History & Facts Range & sizes Pulley programme Function Term Taper Bush REC V – Belts Dimensions / tolerances Catalogue – JOYRO Pulleys Advantages Weight reduction Design Startup Energy Small Tension Increased speed Reduced belt temperature Balancing Samples Features of the JOYRO Pulley Agenda
History - facts History : 2007 JOYRO Pulley design. 2008 Prototypes and load tests. 2009 First JOYRO Pulley on the market. 2010 - 2011 Additional tests : Temperature, wear, noise …etc. 2012 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.
Range & sizes JOYRO® Pulley SG Iron FCD 500 SPZ, SPA, SPB, SPC - Diam 140 - 1250 mm Traditional Pulley Grey Iron FC 25 SPZ, SPA, SPB, SPC - Diam 50 - 236 mm
Pulley programme Grooves Rim Arms/spokes Hub Shaft Bush Screws
Weight reduction 40-50 % Table 1 Pulleys reduced from more than 40kg to less than 40kg Weight reduction Table 1
Design Example Traditional SPB 450-8 / JOYRO SPB 450-8
Startup energy Traditional SPB 400*8JOYRO SPB 400*8
Smaller tension in arms Because of the tangential connection between arms and hub the tensile stress in the arms will be reduced as the hub is able to rotate fractions of degrees during the cooling period after casting.
Increased speed Setup: 5 kW motor (n1 = 3000 rpm) Frequency changer SPA 200-2, SPA 100-2 SPB 355-4 The SPB 355-4 mountet as shown with no belts, and the rotational speed n2 is increased to 7400 min -1 ~138 m/s. No damage on pulley, and further tests were not found expedient. Increased speed (test) double speed is double power!! d3 = SPB 355-4 D2 = SPA 100-2 d1 = SPA 200-2
Reduced belt temperature Traditional SPB 250-4 (After 2 working hours) JOYRO SPB 250-4 (After 2 working hours) Thermal imaging camera shooting
Correlation between the belt and the temperature Every 10°C reduced belt temperature =Double life length!!
Balancing Standard balancing grade (ISO 1940) : G16 (30m/s) Static / Dynamic balancing (ISO 254) : n = 1,58 x 1011 Dm x B n = v x 60 Dm x 10 x -3 n < n : Static balancing 1 n > n : Dynamic balancing Special demands regarding balancing can be arranged!
Transferring high power at high revolutions (Compressor customer) Gearbox required! Alt.: 1 Transmission with regular v-belt pulleys Required output: P = 200 kw, nw = 8000 min-1, Solution: n1 = 1500 min-1 d1 = 450 mm n2 = nw/4 = 2000 min-1 (Gearbox) n1 = d2/d1 x 2000 min-1 d2 = n1/n2 xd1 = 335 mm Belt speed: V = d1 x n1 x p /60 = 0,45 x 1500 x p/60 = 35 m/s n1 = 1500 min-1 P1 = 200kw d1 = SPB 450-8 n2 = 2000 min-1 d2 = SPB 335-8 nw = 8000 min-1 pw = 200kw
Transferring high power at high revolutions (Compressor customer) Alt.: 2 Transmission with VTP/SG Iron pulleys P = 200 kw, nw = 8000 min-1, P1 = 200 kw, n1 = 3000 min-1, d1 = 0,45 m dw = n1/nw x d1 = 170 mm Belt speed: V = d1 x n1 x p /60 = 0,45 x 3000 x p/60 = 70 m/s n1 = 3000 min-1 P1 = 200kw d1 = SPA 450-10 nw = 8000 min-1 pw = 200kw n2 = 8000 min-1 d2 = SPA 170-10 Gearbox eliminated!!