Method for controlling a thick matter pump

Pumps – Condition responsive control of drive transmission or pump...

Reexamination Certificate

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Details

C417S290000, C417S305000, C417S517000, C417S531000, C417S532000, C417S533000, C417S534000, C417S900000, C417S516000

Reexamination Certificate

active

07131820

ABSTRACT:
A method for controlling a thick matter pump comprising two delivery cylinders (10) emerging, via two openings (12), into a material reservoir (14), associated with two delivery pistons (26), symmetrically synchronized relative to said cylinders, and a branch pipe18arranged inside the material reservoir (14), capable of being connected, on the input side, alternatively to one of the openings of the delivery cylinders with exposing of the other opening, the output side connected to a conveyance conduit (20). When the pumping is interrupted, thick matter, liquid concrete for example, is sucked up, via the delivery cylinder temporarily communicating with the reservoir, and is delivered, via the other cylinder (10), connected to the branch pipe (18), so as to form a column of thick matter through the delivery pipe (20), towards its output. In order to avoid problems of deposit, condensation and solidification, the invention is characterized in that the thick matter column is maintained, at least temporarily, in movement, when pumping is interrupted, in the delivery pipe (20) and/or the branch pipe (18) and/or the delivery cylinders (10), while not allowing the thick matter to escape from said delivery pipe (20) on the output side. The invention is further characterized in that, when the pumping is stopped, the thick matter in the matter reservoir is maintained in movement by the back and forth oscillation of the feeding pipe (18) and/or at least one stirrer (34).

REFERENCES:
patent: 3963385 (1976-06-01), Caban
patent: 5180294 (1993-01-01), Watchorn
patent: 5190449 (1993-03-01), Dose et al.
patent: 5865606 (1999-02-01), Huang
patent: 2 039 854 (1972-02-01), None
patent: 2 161 025 (1973-05-01), None
patent: 196 43 038 (1998-04-01), None
patent: 196 53 636 (1998-06-01), None
patent: 299 04 624 (1999-07-01), None

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