Question

1. A cylinder is required to life a load of 120 kN in a system. Fluid pressure available is 15 Mpa. What cylinder size is required?

2. A pump supplies oil at 0.0016 m3/s to a 40 mm diameter double acting hydraulic cylinder. If the load is 5000 N (extending and retracting) and the rod diameter is 20 mm, find the;
   (i) hydraulic pressure during the extending stroke;
   (ii) piston velocity during the extending stroke;
   (iii) cylinder kW power during the extending stroke;
   (iv) hydraulic pressure during the retracting stroke;
   (v) piston velocity during the retracting stroke and;
   (vi) cylinder kW poer during the retracting stroke.

3. What type of actuators used for lifting crane boom?

ii) Explain its mechanism

Answer 1

3. 120x10 0x 103 N 120KN 15 N 2 15 mpa mm P = 2 pa ID 4 154 ID? 1 200103 = 10185.92 100.925 mm D 2). D q KT 20 mm D = 40 mm, nud Given Q=0.0016 m3s, F = 5000 N (0 pressure during the Enlending stroke (5000) (I (40²) mm2 А Pealen 3.98 mpa co.0016) Elu i) Verenion U (Yooo Vertention 1:27 mis FX Vente = 500021 22 in ) power En I power Go 42103 W = 6.4 kW En