Hydrostatic or pneumatic drive and method of operating same

Details Hydrostatic or pneumatic drive and method of operating same Hydrostatic or pneumatic drive and method of operating same

F - Mech Eng,Light,Heat,Weapons

15

B

138/41, 121/63,

F15B 7/00 (2006.01) B22D 17/32 (2006.01) B29C 45/82 (2006.01) F15B 21/08 (2006.01)

Patent

CA 1206065

- 1 - Abstract: A hydrostatic or pneumatic drive for driving a mass to be accelerated and decelerated, such as in a die casting or injection moulding machine, has a controllable valve arrange- ment which is operable to vary the fluid flow rate therethrough. The fluid flow rate is controlled by a reference value control generator operable to produce a ramp having superimposed thereon further control pulses. Such control pulses are a positive control pulse at the beginning of the rising slope and at the end of the falling slope of the ramp and a negative control pulse at the end of the rising slope and at the beginning of the falling slope of the ramp. Each control pulse has a volume which corresponds to a so-called compression volume factor which reflects the compressibility of the fluid used in the drive and also of the elasticity of ducts which expand by fluid pressure.

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