Astec - Over Head Filter Press
The ECO OH range of filter presses has been designed to respond to the need for the highest output in very tough conditions, for instance in the mining industry. It is made of four pulled tie rods to offer perfectly symmetrical thrusting, which translates into minimal stress on the frame and minimal warping of the heads, thus extending the life of the cloths and any part that is exposed to wear. The high level of automatism and reliability are a guarantee of a continuous, unattended work cycle over 24 hours, which means extremely short idle times. Because of the upper beam design, the operator has free access to the filter pieces, such as the cloths and plates, so any scheduled or unscheduled servicing job will be extremely quick and easy. Its high output is largely due to a reliable adjustable-speed plate knockout system, which can strip the whole machine in less than two minutes.
The ECO HP and UHP ranges of filter presses have been designed to filter extremely tough, highly water-resistant sludge, because of the high pressure levels it can work at (up to 60 bar).
With its patented pressing system and a specially reinforced construction, our machines can withstand a higher pumping pressure than the current standards used by our competitors, which means a dramatic decrease in residual humidity as well as a huge increase in productivity.
Using specially-designed movable filter presses, ASTEC can perform high-pressure filtering tests with any kind of pumped sludge in its laboratory or right on site, so our clients can see with their eyes what benefits the high pressure technology can provide with their own sludge.
See across a test report we have been commissioned to perform on extremely tough sludge from household purification plants.
The report suggests that a 60 bar machine involves substantial savings on the costs of dumping sites, while also providing a higher output.
The benefits of the high pressure technology are obvious in any dehydration industry; ASTEC has conducted tests in aggregate, household, marble, ceramic, clay, chemical-physical, food and other industries.
Hydro-pneumatic bag system: the low-pressure (max 30 bar) bag closing system evenly distributes efforts, thus avoiding concentrated stress or warping which could damage the frame and which are the main source of wear in the cloths. In addition to the structural benefits, this system does not use a hydraulic unit or a high-pressure cylinder, which are the main, unavoidable sources of reduced reliability in the long run.
The adjusting and locking system for the movable head uses specially designed adjusting screws, made of stainless steel with an extremely high yield point. The screws are mechanically timed and operated by inverters. The system withstands the stress applied by pressure in a perfectly even and well-balanced way, resulting in lower stress on the whole machine and therefore in a longer life for both plates and cloths.
It is a veritable robot arm which accommodates a high-pressure water jet system. The arm, which runs all along the machine, automatically washes the cloths, one by one. The very high-pressure water jet can remove any kind of impurity so the cloth will be ready to filter and drain again and the plant will be ready to dehydrate the sludge again.
Depending on the material to be filtered or the work cycle, the test laboratory will select one of two opposing feeding systems to deliver the best results in terms of cycle time and solids in the panel.
At the client’s request, safety is provided by photoelectric barriers installed at the sides of the plate pack or by quickly-removable gates (usually, it is the client that analyses the space around the machine with ASTEC’s advice and assistance).
The plate pack is knocked out by a very safe quick-inverter-operated carousel. Such system picks up the plates, one by one, and carries them near the previously opened pack.
This system prevents any plate that has not yet been picked up by the knockout system from uncontrollably moving on its own.
The client may choose whether the filtered fluid should be drained by 4 manifolds installed on top of the fixed head (no side raceways) or by drain pipes installed on each plate, which let the filtrate flow into some side conveyor raceways.
Depending on the type and temperature of the fluid to be filtered, the plates may be supplied in different materials or thickness. Polypropylene, copolymer or cast iron are just a few of such materials.
Cloth washwater is collected in an automatic, tilting metal bowl which opens up to dump the cakes and closes back just after, so, as well as collecting the cloth washwater, it protects the filtrate from the drops that might accidentally fall down during the process.
The monitoring system is served by an integral PLC with a touch screen. Such smart system can manage any optional extra requested by the client, such as remote control of the machine, troubleshooting, processing statistics, Ethernet connection, and much more.