Liquid purification or separation – Processes – Separating
Patent
1995-03-27
1996-10-22
Reifsnyder, David A.
Liquid purification or separation
Processes
Separating
210791, 210225, 210230, 210231, 100198, 100199, B01D 2532
Patent
active
055673279
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a filter press and, more particularly, to a plate shifting mechanism for preferably automatically and sequentially shifting individual filter plates into an open position, with the shifting mechanism incorporating vibratory and air blow devices to facilitate removal of filtrate, particularly sticky filtrate, from the open filter plates.
BACKGROUND OF THE INVENTION
Filter presses are well known and extensively utilized for separating solids from slurries. Such presses employ a plurality of filter plates which are held in contacting relationship between fixed and movable head members while the slurry is pumped into and through the press for collecting the solid in the form of filtrate or cake between adjacent filter plates. When the press is full, then the movable head is backed away from the plates into an open position, and in one type of conventional press, the plates are then individually and sequentially moved into an open position adjacent the movable head to permit discharge of the cake which has collected between the adjacent pairs of plates. To permit movement of the plates into an open position, numerous plate shifting mechanisms have been provided for permitting either automatic or manual control over the plate movement and cake discharge.
In the known filter presses, the plate shifter mechanisms often have required various manual controls or manual manipulations associated with the movement of the plate shifter to effect sequential movement of the plates during opening thereof and dumping of the filter cake, although numerous filter press assemblies have incorporated automatic shifting mechanisms to permit such opening and dumping of the plates to be sequentially automated. Most of the automated shifter assemblies, however, have required drive mechanisms such as chains or pressure cylinders positioned adjacent opposite sides of the press, which drive mechanisms themselves are generally elongate throughout substantially the entire length of the press and hence not only increase the overall size and mechanical complexity of the press, but additionally significantly increase the overall cost of the press. These drive mechanisms are also typically disposed in areas where they are subject to contamination by the material being handled. The filter presses employing automated plate shifters have thus possessed structural and functional features which have been less than desirable.
In addition, the known filter presses have also often operated in less than a satisfactory manner when utilized with materials which result in a filtrate or cake having "sticky" properties. That is, when dealing with "sticky" cake, relying solely on gravity to cause discharge of the cake from between the opened filter plates is often insufficient to effect proper discharge since the cake tends to stick to the filter cloths or membranes of the filter plates. It has been conventional practice to manually assist the discharge by having an operator scrape the sticky cake from the filter plates by use of a paddle or the like. Needless to say, this is a very inefficient and time-consuming process. Further, satisfactory cleaning of the filter plates is difficult to achieve using this technique.
In an effort to improve the discharge of sticky cake, filter presses have been developed and sold which have employed a vibrator, one such press being manufactured and sold by Perrin of Canada. In such press, the filter plates are joined together through a control device such as a cable or linkage so that, during opening of the press, all of the plates are substantially simultaneously moved into an open separated condition with the spacing or separation between each adjacent pair of plates being controlled by the connecting linkage. All of the plates, adjacent one side thereof, are supported on an elongate tube which extends longitudinally along the press and is of square or rectangular profile. This tube is then rotated so as to impose a vibration or bouncing movement on the handles provide
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De Haan Daniel
De Haan Gregory
De Haan Joel D.
Gelfand Leonid B.
Koops Wesley G.
JWI, Inc.
Reifsnyder David A.
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