Hydraulic cylinder main parameters

Hydraulic cylinder main parameters

Primary working hydraulic cylinder working pressure.

From the maximum load value table, take the hydraulic cylinder working pressure is 2MPa.

Calculate the structural parameters of the hydraulic cylinder.

In order to make the hydraulic cylinder fast forward and rewind speed equal, the single-bar piston cylinder differential connection method is adopted to realize fast forward. The two effective areas of the hydraulic cylinder are A and A, and A=2A, ie d=0.707D, to prevent The pre-crush phenomenon occurs when drilling, the back pressure of the hydraulic cylinder returning chamber is selected to be 0.6 MPa, and the hydraulic cylinder is taken back 0.5 MPa when retracting.

The equilibrium force balance equation PA=PA+F of the hydraulic cylinder under the working condition can be obtained:

A=F/(P-0.5P)=71.89cm

The inner diameter D of the hydraulic cylinder is:

D=9.75cm rounded to 10cm

From d=0.707D, rounded to d=cm

The speed control valve is used for speed adjustment, and the minimum stable flow rate is q=0.05L/min.

The actual required flow rate of the hydraulic cylinder:

Required flow rate during work: Q=72/100x0.05x60/0.9=2.4L/min.

Required flow rate for fast empty motion: Q=72/100x0.05x60x10/0.9=24L/min.