EP 0971126 A1 20000112 - Actuation of the S-valve of a concrete pump prior to completion of piston stroke
Title (en)
Actuation of the S-valve of a concrete pump prior to completion of piston stroke
Title (de)
Betätigung des S-Ventils einer Betonpumpe vor Beendigung des Kolbenhubs
Title (fr)
Actionnement de la soupape à S d'une pompe à béton avant la fin de sa course de piston
Publication
Application
Priority
IT MI981572 A 19980709
Abstract (en)
The invention concerns a concrete pump, of the type comprising a pair of pumping cylinders alternatively operating under the control of a backflow hydraulic pump - to draw concrete from a hopper and feed it, by way of a rocking valve (S-valve), into the transport and delivery duct - wherein said cylinders are provided with stops to control the advance of the starting movements of the S-valve and wherein the motion of the pistons in the cylinders is reversed in respect of the moment in which said pistons reach the top dead center. According to the invention, said stops are located in the position for the most efficient working with the highest number of pumping cycles per minute, and electronic means are provided to set said advance time, by delaying the starting movement of the S-valve and the reversal of the backflow hydraulic pump according to the actual number of pumping cycles per minute. <IMAGE>
IPC 1-7
IPC 8 full level
F04B 15/02 (2006.01)
CPC (source: EP)
F04B 15/02 (2013.01); F04B 2201/0207 (2013.01)
Citation (search report)
- [X] EP 0562398 A1 19930929 - SCHWING GMBH F [DE]
- [X] US 5458470 A 19951017 - MANNHART OTHMAR [CH], et al
- [X] DE 4035518 A1 19920514 - PUTZMEISTER MASCHF [DE]
- [X] US 4533300 A 19850806 - WESTERLUND ROBERT E [US], et al
- [X] WO 9304282 A1 19930304 - PUTZMEISTER MASCHF [DE]
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
EP 0971126 A1 20000112; EP 0971126 B1 20060503; AT E325272 T1 20060615; CY 1105103 T1 20091104; DE 69931106 D1 20060608; DE 69931106 T2 20061116; DK 0971126 T3 20060904; ES 2262272 T3 20061116; IT MI981572 A1 20000109; PT 971126 E 20060929
DOCDB simple family (application)
EP 99113573 A 19990708; AT 99113573 T 19990708; CY 061101021 T 20060721; DE 69931106 T 19990708; DK 99113573 T 19990708; ES 99113573 T 19990708; IT MI981572 A 19980709; PT 99113573 T 19990708