Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...
Patent
1995-05-05
1997-06-24
Lopez, F. Daniel
Power plants
Pressure fluid source and motor
Having condition responsive control in a system of distinct...
60452, 91518, 91532, 91446, 137884, F16D 3102
Patent
active
056408501
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention is related to a hydraulic pressure supply- and control-device for a mobile concrete pump, having a multi-armed distributing boom positioned pivotably on a vehicle and having a hydraulic pivot drive and hydraulic elevation drives individually assigned to the arms of the boom, on the one hand, as well as a hydraulic support device, by which the vehicle is supported at corners of a larger area outside the vehicle base area against tipping over, on the other hand, as hydraulic consumers, for whose pressure supply a single load sensing pressure supply device is provided, whose pressure output is connectable alternatively to a hydraulic control unit of the support device or a hydraulic control unit of the distributing boom by way of an operating mode selector valve, so that--for reasons of operating safety--the support device and the boom may not be selected--"moved"--simultaneously.
BACKGROUND OF THE INVENTION
A hydraulic pressure supply- and control-device of this type was exhibited as part of a mobile concrete pump at the trade fair "BAUMA" in April 1992. In this known pressure supply-and control-device, the hydraulic control unit of the distributing boom has control valves which are individually assigned to the pivot drive and the elevation drives of the boom, electro-hydraulically or electro-pneumatically pilot controlled and hydraulically actuated, as well as pressure controlled load-comparative valves which react to the pressures prevailing in the respective partial consumers of the boom, and which are connected to each other in a hydraulic chain and mechanically combined in a control valve block, wherein the valve groups formed by one control valve and one comparative valve, respectively, each of which are assigned to one of the boom drives, are positioned spacially adjacent to each other. Herein, the comparative valves may be serially connected to each other by channels which form sections of a load feedback line. These channels lead from a comparative output of the respective comparative valve to a load-comparative terminal of that adjacent comparative valve which is positioned at the supply device side, as seen from the comparative output of the first valve. These comparative valves are moved into a functional position connecting the load connection to the comparative output and blocking it with respect to the load-comparative input by a relatively higher pressure at a load-connection, at which the pressure effective in the connected partial consumer prevails, than in their load-comparative input, and they are moved into a functional position connecting the load-comparative input to the load-comparative output and blocking this with respect to the load connection by a relatively higher pressure at the load comparative input than at the load-connection. By this, it is attained that the respectively highest pressure prevailing in one of the partial consumers is fed back to the pressure supply device, and that it may be sensed there, in order to adjust the flow rate of the pump of the pressure supply device according to the requirements. The valves combined to form the valve block have disc-shaped casings which have continuous bores in a base arranged in a defined bore layout. These bores are connected communicating each with one supply terminal or one control terminal of the respective valve. Furthermore, the valve casings have continuous bores, through which the tie rods may be stuck by which the valves may be connected to each other, such that the bores communicating with hydraulic terminals of the valves form continuous supply channels which are tightly sealed in the region of the connection planes, at which the casings of adjacent valves lie against each other, with respect to the environment, by O-rings surrounding the ports of the bores.
By this design, a hydraulic longitudinal chain of the valves combined in the block, as viewed in the direction of the casing bores aligned with respect to each other, without an appreciable expenditure of pipes, and an indi
REFERENCES:
patent: 3766943 (1973-10-01), Murata
patent: 4856549 (1989-08-01), Ueno
patent: 5086803 (1992-02-01), Nakajima
"What you can get in manifolds", Hydraulics and Pneumatics, vol. 16, No. 11 (Nov. 1963) pp. 88-89.
Heinrich Loedige: Nutzbare Leistung Einer LS-Hydraulik O +P Olhydraulik und Pneumatik 36, 1992, Nr. 4 pp. 234, 237-241.
Albrecht Siegle: Wegeventile Mit Flanschbild Nach Din Iso 5599/1 Pneumatik Herion Informationen, 1987 pp. 66-70.
Hartmut Benckert & Hans Renz: Entwicklung der Antriebshydraulik Fuer Mobile Betonverteilermaste; O+P Olhydraulik und Pneumatik 36, 1992, Nr. 4 (pp. 242-244, 247, 248, 251).
Th. van Hamme and W. Roehrs: Entwicklungstendenzen der Hydrostatik in Baumaschinen; O+P Olhydraulik und Pneumatik 30, 1986, Nr. 7 (pp. 514-520).
Benckert Hartmut
Galambos Gabriel
Muenzenmaier Werner
Renz Hans
Lopez F. Daniel
Putzmeister-Werk Maschinenfabrik GmbH
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