Classifying – separating – and assorting solids – Stratifiers – With liquid treatment
Patent
1995-07-28
1998-04-21
Nguyen, Tuan
Classifying, separating, and assorting solids
Stratifiers
With liquid treatment
209502, 13759616, 25112917, B03B 552
Patent
active
057409200
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a pneumatic jigging screen device with an air chamber for generating the pulsation, which air chamber is connected via an inlet valve with a compressed air source and via an outlet valve with an outlet, whereby the inlet and outlet valves are embodied as disk valves connected respectively via a valve rod to a pneumatically actuatable valve drive.
A jigging screen device having the aforementioned features, which separates the supplied materials in a pulsating water bath according to their specific gravity, is known from the company brochure "BATAC-Setzmaschinen" 4-202 of the Company KHD Humboldt Wedag AG, 7-84. The pulsating water bath is generated by the cycled supply, respectively, removal of compressed air. The supply of compressed air, respectively, the removal of the air cushion takes place via controlled valves which, besides mechanical or electrical valve drives, can also be pneumatically actuated as especially in the BATAC jigging screen device. With the known pneumatic valve drives the disadvantage is encountered that external energy in the form of seperately supplied compressed air as control air is required for the actuation of the pneumatic valve drives.
From German patent 1 217 292 a pneumatic jigging screen device of the aforementioned kind is known in which the pneumatically driven disk valves are controlled by electromagnetic control valves whereby, however, in this prior art device a separate compressed air network for supplying the control air must be provided.
It is therefore an object of the invention to lower for a jigging screen device of the aforementioned kind the energy consumption and to improve the precision of the valve control.
SUMMARY OF THE INVENTION
A pneumatic jigging screen device according to the present invention is primarily characterized by: compressed air source and the air chamber, the air inlet valve including a valve rod; chamber and the air outlet, the air outlet valve including a valve rod; valve; valve; second valve drives; pneumatic valve drive and the compressed air source in the connecting line; and pneumatic valve drive and the compressed air source in the connecting line.
Each one of the first and second pneumatic valve drives preferably comprises a pressure-tight housing and a diaphragm positioned therein, wherein the diaphragm is connected to the valve rod.
Advantageously, each one of the first and second pneumatic valve drives is a piston-cylinder drive acting on the valve rod.
Preferably, each one of the electromagnetic control valves is a 4/3-way valve.
Expediently, each one of the disk valves comprises a spring for biasing the disk valve into a closed position and each one of the electromagnetic control valves is a 3/2-way valve.
The sluggishness of each one of the disk valves, defined by a ratio of a working surface of the diaphragm to a surface area of the disk valve, is preferably at most as great as the sluggishness of the corresponding one of the first and second electromagnetic control valves.
Expediently, each one of the disk valves further comprises a stroke-limiting device for limiting the stroke of the valve rod.
The stroke-limiting device preferably comprises a position-adjustable stop plate positioned in the housing for stopping the free end of the valve rod extending into the housing. Advantageously, the stroke-limiting device further comprises a hydraulic cylinder for position-adjusting the stop plate.
In the alternative, the stroke-limiting device comprises a stop seated on the valve rod, the stop comprising a locking hook fixedly connected to the housing and serving as a mechanical abutment. Preferably, the locking hook is height-adjustable. Advantageously, the locking hook is pivotable out of a path of movement of the stop seated on the valve rod.
The invention is based on the basic principle that the pneumatically actuatable valve drives for the inlet and outlet valves are connected with interposition of electromagnetic control valves to the compressed air source of the jigging
REFERENCES:
patent: 1789516 (1931-01-01), Crangle
patent: 3012751 (1961-12-01), Hauser
patent: 3285414 (1966-11-01), Bosman
patent: 4019981 (1977-04-01), Stern et al.
patent: 4353392 (1982-10-01), Ruchser et al.
patent: 4832835 (1989-05-01), Strauss et al.
patent: 5454399 (1995-10-01), Kazakis et al.
Siegfried Heintges; Neue Austragsreggeiung . . . Trenndichten; 1987; pp. 693-696.
J. van Gemerden; Technische . . . werktuigbouwkundigen; Oct. 1982; pp. 432-433.
BATAC-Setzmaschinen; Jul. 1984; KHD Humboldt Wedag AG.
Nguyen Tuan
Ruhrkohle Aktiengesellschaft
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