Pumps – Expansible chamber type – Mechanically actuated distributor
Patent
1996-09-27
1999-09-28
Thorpe, Timothy S.
Pumps
Expansible chamber type
Mechanically actuated distributor
1510406, F04B 1502
Patent
active
059576758
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a thick matter pump with a material feed container, two hydraulically driven conveyor cylinders ending with their front-side openings opening into the inside of the material feed container, a swivelling pipe extending into the material feed container, communicating with its one end alternately in pulses with the front-side openings in the conveyor cylinders, and being connected with its other end to a conveyor pipe.
BACKGROUND OF THE INVENTION
Thick matter pumps of this type are mainly utilized for conveying of concrete and more or less viscous sludge. The pipelines of the thick matter pump and of the material feed containers must therefore be emptied and cleaned at the end of a conveying operation. The conveyor pipeline, which in concrete pumps is usually fastened on a distributor mast, can be emptied either by sucking the concrete contained in it back into the material feed container through the thick matter pump itself or under pressure applied in reversed direction with the help of a pressure medium, like compressed air or water, forced into the conveyor pipeline. The physical wiping of the pipelines is done by means of elastomer sponge balls or cleaning members, which are either sucked through the open conveyor pipe end to the material feed container or are forced through suitable pipeline armatures into an opposite direction. It is furthermore known to provide closable cleaning apertures in the pipeline wall in the area of the swivelling pipe, through which apertures access to the inside of the pipeline for cleaning purposes is possible. Not yet satisfactorily solved is the problem of the emptying of the residual concrete existing in the material feed container. Also the handling of the sponge balls during the cleaning of the pipelines leaves much to be desired.
OBJECTS OF THE INVENTION
Starting out from this, the basis purpose of the invention is to improve the known concrete pumps of the above-disclosed type so that the conveyor pipes of the material feed containers can be emptied and cleaned through simple manipulations.
To attain this purpose, it is suggested according to a first modification of the invention, to utilize the cleaning apertures, which already exist in the pipe wall of the conveyor pipe and/or of the swivelling pipe, additionally for feeding the sponge balls into the conveyor or swivelling pipe on the one hand, and/or for emptying the material feed container on the other hand. A cleaning cartridge, which is open on one side toward the cleaning aperture and has at least one compressed air and/or pressure water connection, is connected to the closable cleaning cartridge provided in the pipe wall of the conveyor pipe and/or of the swivelling pipe, whereby the conveyor pipe and/or the swivelling pipe can be closed off on the side of the conveyor cylinder by means of a blocking member. In order to present, during the operating stage of the pump, the thick matter access to the cleaning cartridge, the cleaning cartridge can be advantageously blocked off at the cleaning aperture by means of a blocking member, in particular by a blocking slide. The cleaning cartridge is advantageously hinged in the area of the cleaning aperture to the conveyor pipe or swivelling pipe in such a manner that it can be swung away from the cleaning aperture preferably with the blocking slide being closed thereby freeing the cleaning cartridge frontal opening. The same result can be achieved by rigidly connecting the cleaning cartridge and the blocking member and by being able to move them selectively against the cleaning aperture. It is also possible to connect two cleaning cartridges to the blocking slide, which cartridges can be equipped selectively with sponge balls, cleaning scrapers or with liquid-filled bags.
According to a second modification of the invention, it is also possible to selectively connect a transporting pipe to the cleaning aperture, through which pipe the material feed container can be emptied but for a small residual amount with the he
REFERENCES:
patent: 3063079 (1962-11-01), Bergman et al.
patent: 3146477 (1964-09-01), Bergman et al.
patent: 3543324 (1970-12-01), Knapp et al.
patent: 4373225 (1983-02-01), Ecardstein et al.
Buehrer Klaus
Hurr Hellmut
Evora Robert
Putzmeister Aktiengesellschaft
Thorpe Timothy S.
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