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AssigneePutzmeister Aktiengesellschft
InventorsStefan Hofling, Wilhelm Hofmann, Wolf-Michael Petzold
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A device and a method for controlling a two-cylinder thick matter pump comprising conveyance pistons that are actuated in a push-pull manner by means of a hydraulic reversible pump (6) and hydraulic drive cylinders controlled by said pump. For each pressure stroke, the conveyance cylinders (50, 50′) are connected to a conveyance conduit (58) by means of a pipe switch (56). At the end of each conveyance stroke in the conveyance cylinders (50, 50′), a reversal process of the pipe switch (56) and the reversible pump (6) is triggered. The aim of the invention is to ensure a reliable operation of the pump, even in the event of a breakdown of switching and pressure sensors (20, 22, 24). To this end, during the calibration of the concrete pump and/or during the operation of the pump, the expected length of the stroke of the pistons (8, 8′) in the drive cylinders (5, 5′) is measured and recorded, the stroke time of each conveyance stroke is monitored and compared with the expected stroke duration, and the reversible pump (6) is respectively pivoted, reversing the flow, and/or the pipe switch (56) is reversed when the stroke time exceeds the expected stroke duration by a pre-determined value. The output signals of a pressure sensor (24) connected to the reversible pump (6) or cylinder switching sensors (20, 20′) arranged on the working cylinders can also be evaluated in order to trigger a reversal process.
A device for controlling a thick matter pump with two conveyor cylinders (50, 50′) communicating via two end openings (52) in a material supply container (54), operated in counter stroke by a hydraulic reversible pump (6) via hydraulic drive cylinders (5, 5′) control by said pump, with a hydraulically actuated pipe switch (56) provided within the material supply container (54), on its inlet side alternatingly connectable to one of the openings (52) of the conveyor cylinders (50, 50′), freeing the respective other opening, and on the outlet side connected with a conveyor conduit (58), wherein the drive cylinders (5, 5′) are hydraulically connected with a connector of the reversible pump (6) via respectively one hydraulic line (11, 11′), and on their other end are connected to each other via an oscillating oil line (12), and further comprising a device (18) for reversing the reversible pump (6) after the conclusion of each piston stroke, thereby characterized, that the reversing device includes a computer assisted routine (84, 82) for determining an expected stroke duration and for the recording thereof in a data storage as well as for monitoring the time during each piston stroke, and for initiating a reversal of the pipe switch (56) and/or the flow-through reversal of the reversible pump (6) based on a comparison of the value of an elapsed stroke time with the expected stroke duration.
A process for controlling a thick matter pump with two conveyor cylinders (50, 50′) communicating with two end openings (52) in a material supply container (54), operated in counter stroke via a hydraulic reversible pump (6) and via hydraulic drive cylinders (5, 5′) control thereby, with a hydraulically operated pipe switch (56) provided within the material supply container (54), on its inlet side alternatingly connectable to the openings (52) of the conveyor cylinders (50, 50′) freeing the respective other opening and on the outlet side connected with a conveyor line (58), wherein the drive cylinder (5, 5′) are connected under one and via respectively one hydraulic line (11, 11′), with a connection of the reversible pump (6) and on their other end via an oscillating oil line (12) with each other hydraulically, with at least two cylinder switch sensors (20, 20′;
A device for controlling a thick matter pump with two conveyor cylinders (50, 50′) of which two end openings (52) are in communication in a material supply container (54), operated in counter stroke via a hydraulic reversible pump (6) and via hydraulic drive cylinders (5, 5′) controlled thereby, with a pipe switch (56), wherein respectively upon ending of a conveyance stroke in the conveyance cylinders (50, 50′) a reversal process of the pipe switch (56) and/or the reversible pump (6) is initiated, whereby during calibration of the concrete pump and/or during the pump operation the anticipated stroke duration of the piston (8, 8′) in the drive cylinders (5, 5′) is measured and recorded, that during each conveyance stroke the stroke time is monitored and compared with the anticipated stroke duration, and that the reversible pump (6) pivoted about with reversal of the flow-through is and/or the pipe switch (56) is reversed when the stroke time exceeds the anticipated stroke duration by a predetermined value.
A device for controlling a thick matter pump with two conveyor cylinders (50, 50′) of which two end openings (52) are in communication in a material supply container (54), operated in counter stroke via a hydraulic reversible pump (6) and via hydraulic drive cylinders (5, 5′) controlled thereby, with a hydraulically operated pipe switch (56) provided within the material supply container (54), on its inlet side alternatingly connectable to the openings (52) of the conveyor cylinders (50, 50′) freeing the respective other opening and on the outlet side connected with a conveyor line (58), wherein respectively upon ending of a conveyance stroke in the conveyance cylinders a reversal process of the pipe switch (56) and/or the reversible pump (6) is initiated, wherein during the pump process the hydraulic pressure is monitored on the pressure side of the reversible pump (6), and that a pressure increase measured at the end of each piston stroke is evaluated for formation of a reverse signal (76) for the reversible pump (6) and/or the pipe switch (56).
Dependencies are inferred from the claim text.