Thick matter piston pump

F - Mech Eng,Light,Heat,Weapons – 04 – B

Patent

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Details

F04B 15/02 (2006.01)

Patent

CA 2557152

The invention relates to a multi-cylinder thick matter pump (1) which is used to continuously deliver especially concrete. Said thick matter pump comprises at least two delivery cylinders (3, 5) which transport the thick matter from a prefill tank (7) into a delivery pipe and a reversing valve (9) for alternately linking the delivery cylinders with the delivery pipe. The invention is characterized in that the reversing valve (9) comprises two pilot valves (15, 17) which can be displaced in a substantially translatory manner. Every pilot valve (15, 17) comprises a straight pipe section (15L, 17L) for linking the respective assigned delivery cylinder (3, 5) with the delivery pipe. Said pipe section can be linked with a manifold (19) in a pipe position downstream of the delivery cylinder. The invention also relates to a method for operating the inventive thick matter pump for continuous delivery.

L'invention concerne une pompe à liquides épais (1) à plusieurs cylindres, servant à acheminer notamment du béton. Cette pompe comprend au moins deux cylindres d'acheminement (3,5) qui acheminent le liquide épais à partir d'un réservoir de pré-remplissage (7) dans une conduite d'acheminement. Une soupape d'inversion (9) servant à accorder de manière alternée les cylindres d'acheminement à la conduite d'acheminement est associée à cette pompe. Selon l'invention, ladite soupape d'inversion (9) présente au moins deux tiroirs de commande (15, 17) pouvant effectuer sensiblement un mouvement de translation. Chaque tiroir de commande comprend une partie de conduite rectiligne (15L, 17L) destinée à raccorder le cylindre d'acheminement (3,5), qui lui est respectivement associé, à la conduite d'acheminement. Cette partie de conduite peut être raccordée à un collecteur (19) dans une position de conduite en aval du cylindre d'acheminement. L'invention concerne également un procédé pour faire fonctionner cette pompe à liquides épais en mode d'acheminement continu.

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