(57) Oscillatory actuator for pumps for concrete or other dense or incoherent liquid products,
having a pinion or ring gear unit (11) which is connected to the end of the gooseneck
pipe (CC) which is to be made to rotate alternately in both directions, and which
interacts with a rack (10) driven hydraulically by the alternating sliding of its
end pistons (110, 110') in sealed chambers formed in a box-like body (1) which contains
the rack and pinion unit, characterized in that the end pistons of the rack, with their piston rings and lateral gaskets (9, 9'),
slide in wear liners (5, 5') mounted in a sealed way with corresponding gaskets (4,
4') in robust tubes (2, 2') which are fixed, with their sealing means (3, 3'), in
axially aligned seats (201, 201') of said box-like body, together with the caps (7,
7') which interact in a sealed way with said liners and which have holes (12, 12')
for connection to the pipes of the hydraulic drive circuit, these pipes having alternating
delivery and discharge functions.
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