Motors: expansible chamber type – Cyclically operable – Working member controlled motive fluid for distributor motor
Patent
1986-01-10
1987-08-25
Hershkovitz, Abraham
Motors: expansible chamber type
Cyclically operable
Working member controlled motive fluid for distributor motor
91318, 91323, 91433, 91471, 60418, 173119, F01L 2502, F15B 1110, F16D 3102, B25D 900
Patent
active
046884688
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a method of and to an apparatus for controlling pulse hydraulic generators as used on hydraulic excavators or as autonomous installations for pile driving, crushing of oversize rock structures in mining, and in the knocking out of slag ladles.
BACKGROUND OF THE INVENTION
Methods and control installations are known for the actuation of striking elements using pulse hydraulic generators and wherein a distributing valve is incorporated in the pulse generator body and is controlled in turn by the striking element with or without a kinematic linkage with the distributing value.
These systems differ from one another as to the location of the striking element and distributing unit as well as in the reciprocal cooperation. But these installations have the disadvantage, inter alia, of difficult adaptation to various working conditions, limited range of standarized sizes, and long reaction times.
SUMMARY OF THE INVENTION
The method, according to the invention, eliminates these disadvantages because the control of the stiking element of the pulse generator is no longer conditioned by the striker position in its body but by the pressures achieved in the hydraulic circuits of the generator, pressures conditioned only by intermediate and limiting stages of the energy of the installation and of another energy accumulating element. The control installation, according to the invention, uses hydraulic binary logic elements, controlled by output signals from a hydraulic processor that analyzes the signals from accumulator and energy generator and, depending on their condition, distributes the working fluid to the striker, lifting it simultaneously with energy accumulation on the opposite side of the striker and lowering it with release of accumulated energy adding to the energy supplied by the energy generator of the circuit.
BRIEF DESCRIPTION OF THE DRAWING
The sole FIGURE of the drawing is a hydraulic diagram of the striking element of a pulse hydraulic generator according to the invention.
SPECIFIC DESCRIPTION
The method according to the invention, uses in achieving the effective work, a striking element 1 that can be lifted and lowered inside cylinder 2. Lifting and lowering forces of the striking element 1 are achieved by differentially applying pressure to working surface areas a, b and c of the striking element 1 in the cylinder 2. The phenomenon is cyclical and it consists of a lifting stage and of a lowering stage.
During the first part of the lifing stage of the striking element 1 in the compartment served by surface a the pressure fluid is introduced from a pump 3 through a logic element 4, e.g. an on-off valve.
The fluid from the compartment served by area c, on the up stroke is forced into an accumulator 5 and the fluid from the compartment served by area b is sent to a tank 6 through a logic element 7.
During the last part of the lifting stage, before the striking element 1 covers the entire stroke in cylinder 2, connection with pump 3 is interrupted by closing the logic element 4, pump 3 feeding the pressure fluid into accumulator 5 through logic element 8, leading to braking of the striking element 1. During this last stage a check valve 9, connected to tank 6, allows the filling of the compartment served by surface a.
After the striking element 1 has covered the entire stroke during the lifting stage, pump 3 goes on feeding the fluid into accumulator 5 until the maximum prescribed pressure for the accumulator is reached. The lowering stage of the striking element 1 starts at this moment. During this stage a chamber d served by area c is subjected to the action of pressure from accumulator 5 and pump 3 and by opening the logic element 10 and closing the logic element 7 and enclosure e served by area b will be under the action of pressure from accumulator 5 and pump 3.
To obtain maximum impact effect during lowering the chamber f served by surface a of the striking element 1 is connected through logic element 11 to tank 6 of the installation. Becaus
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Arama Stefanica
Axinti Gavril
Badulescu Florin
Bratu Polidor
Diaconu Cristian
Dubno Herbert
Hershkovitz Abraham
Intreprinderea de Utilaj Greu "Progresul"
Kapsalas George
Ross Karl F.
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