Method for conveying or transporting fluid or semi-fluid materials with a dual piston pump and the dual piston pump

Abstract

The present invention relates to a method for transmitting or conveying fluid or semi-fluid materials, in particular concrete or cement, by means of a double piston pump (1), which comprises two conveying cylinders (3, 4), each provided inside with a conveying piston (5, 6), said conveying pistons (5, 6) being movable in an alternating push-pull manner, a feed hopper (7) for receiving material to be conveyed, which is fed by a material feed unit, a transfer tube system (13) comprising a transfer tube (14), which is connectable to a flow line or conveying pipes and is capable to connect said flow line or conveying pipes alternately with one of said conveying cylinders (3, 4) by means of articulation means (17), said articulation means (17) comprising two swivel or plunger cylinders (45, 47) being hydraulically actuateable, the swivelling movement of said transfer tube (14) being generated by said swivel or plunger cylinders (45, 47), a conveying piston drive mechanism (23) comprising a drive piston (19, 21) for each conveying piston (5, 6) provided in a hydraulic drive system (24), said drive pistons (19, 21) being connected to the dedicated conveying piston (5, 6), wherein both drive pistons (19, 21) are supplied by a conveying pump (39) being provided in a hydraulic circuit, said supply being controllable by a valve, and a main control valve (V5) with which the alternating hydraulic supply to the corresponding drive piston (19, 21) is controlled, characterised in that during swivelling movement of the transfer tube (14): - the hydraulic supply to the drive pistons (19, 21) is interrupted and said hydraulic circuit of the conveying pump is short-circuited by means of said main control valve (V5), and - the delivery rate of the conveying pump is increased, so that after the swivelling movement of the transfer tube (14) has been terminated and at the beginning of a next conveying cycle an increased supply output of the supplying conveying cylinder (5, 6) is carried out for a short term leading to a short-term increase of said supplied fluid or semi-fluid materials.

Description

technical field [0001] The present invention relates to a method of conveying or transporting fluid or semi-fluid materials with a dual piston pump. Furthermore, the invention relates to a double-piston pump for conveying or transporting fluid or semi-fluid materials, in particular concrete or cement. Background technique [0002] Dual piston pumps for the above purposes are well known in the art. According to DE 42 15 403 C2, a double-piston pump for conveying or conveying fluid or semi-fluid materials, especially concrete or cement, is known which comprises two conveying cylinders each arranged with a conveying piston inside, those The delivery piston is movable in an alternating push-pull manner. A feed hopper is provided for receiving material to be conveyed fed by the feed unit. A transfer pipe system (S-Weiche) comprising a transfer pipe which can be connected to a flow line or delivery pipe and which can be connected alternately with one of the delivery cylinders b...

AI Technical Summary

Problems solved by technology

[0005] Although this "push through" system provides the better performance of a dual piston pump, some pulsation is still unavoidable

Images