Pumps – With condition responsive pumped fluid control – Manual actuation of condition responsive valve
Patent
1996-02-08
1998-10-20
Freay, Charles G.
Pumps
With condition responsive pumped fluid control
Manual actuation of condition responsive valve
417440, 417900, 251 58, 60481, F04B 4900
Patent
active
058237488
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a device for opening and closing a closure cap arranged on a bottom-side cleaning opening of a container, in particular, a material-feeding container for thick-matter pumps.
BACKGROUND OF THE INVENTION
In a conventional arrangement of this type, the closure cap is arranged on a container-fixed hinge joint, can be opened for emptying and cleaning of the feeding container of a concrete pump, and closed manually by swivelling. Increased frictional resistances occur, in particular during the opening operation, due to material adhering to the closure cap. These frictional resistances make the manual operation of the closure cap more difficult.
In order to make the operation easier, it would be possible to provide a hydraulic device for opening and closing of the closure cap. However, one must thereby consider that in such devices injury to an operator must be prevented through suitable safety measures. This, as a rule, requires additional equipment and related increased expense.
SUMMARY OF THE INVENTION
Starting out from this, the basic purpose of the invention is to provide a simple arrangement of the above-identified type, with which a closure cap on a container, as for example a material-feeding container of a thick-matter pump, can be opened and closed by one operator with little effort and without any danger of injury.
The invention is based on the thought that during the hydraulic opening of the closure cap, a danger of injury is essentially eliminated and that vice versa during closing of the closure cap, when the container is empty and has been cleaned, the manual closing does not require any particular strength. Accordingly, the invention suggests a hydraulic drive unit, which can be moved between an output and an end position and is coupled to the closure cap, for adjusting the closure cap between a closing position sealing off the cleaning opening and an outlet position at least partially releasing the cleaning opening, whereby the closure cap can be adjusted into its outlet position by operating a hydraulic correcting element controlling the pressure oil supply to the hydraulic drive unit and can be manually returned into its closing position by means of a mechanical control member with a simultaneous return of the hydraulic drive unit into its initial position.
The hydraulic drive unit has according to a preferred embodiment of the invention a drive piston, which can be moved in a one-way operating hydraulic cylinder, which can be loaded on the bottom side with pressurized oil and is connected on the rod side to an oil tank or to the atmosphere.
The feeding movement of the drive piston can be converted in a container-fixed hydraulic cylinder through a linkage connected to the piston rod into a pivoting movement of the closure cap. The drive piston can, as an alternative, be coupled through a rocking lever hinged on the piston rod to the closure cap, whereby the hydraulic cylinder in this case is pivotally arranged about an axis parallel to the axis of the cleaning opening on the container.
For the manual closing of the closure cap, the mechanical control member can be constructed as a handle or hand lever connected rigidly to the piston rod or to the closure lid.
The hydraulic supply to the hydraulic cylinder is advantageously controlled by a control valve designed as a 3/2-directional valve, whereby the bottom side of the hydraulic cylinder is connected, in a preferably manually operated switching position of the directional valve, to the pressure-oil supply and in the spring-centered rest position of the directional valve to the oil tank. Thus an incorrect handling of the hydraulic drive unit is essentially eliminated. At the same time, it is assured that the pressurized oil can, without any further measures, be removed from the bottom area of the driving cylinder upon operation of the mechanical control member and thus the hydraulic piston can be returned into its initial position.
For the measured discharge of the goods existing in the cont
REFERENCES:
patent: 2600499 (1952-06-01), Harrower
patent: 4178142 (1979-12-01), Schwing
patent: 4466782 (1984-08-01), Hirashima et al.
patent: 4563135 (1986-01-01), Riker
patent: 4681022 (1987-07-01), Schwing
patent: 4979884 (1990-12-01), Letarte et al.
Putzmeister Betonfoerderleitungs-Programm PM Putzmeister-Werk Maschinenfabrik GmbH Mar. 1978; pp. 2-7.
Baeumen Paul
Benckert Hartmut
Hurr Hellmut
Freay Charles G.
Putzmeister-Werk Maschinenfabrik GmbH
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