The drip trays catch spills off the cloth, or washing water during the cloth washing and drain it to the collection trough. They are installed under the set of filtration plates.

The most frequent material is PP, the plates can also be made of stainless steel or other materials as requested.

• Used mainly for large filter presses.
• Major facilitation of the filter press attendance– the plates need not be removed manually before shifting, which would be very difficult with the large filter presses (large sizes and heavy-weights, limited room for handling).

Drip Tray is installed under filter plates, and make up of liquid collecting tray.The drip tray can be opened and closed by the help of hydraulic cylinders, which are controlled from the panel manually or automatically through PLC. It ensures that the drip trays are in open position for cake discharge and in closed position during filtration. So that it collects the filtrate and keep it away from containers or the conveyor system.

While filtering, the PLC sends output a signal to drip tray, under the work of driven system, the both trays will close.The liquid drips, caused by capillary action, and peripheral filtrate will fall on it and is collected in chute on both sides. After filtering process is finished and before cake discharging, the PLC will send logic signal to open it.

When an automatic cloth washing system is being utilized – as is common with many of today’s filter presses – it is generally helpful for the automated drip trays/bomb doors to capture the water coming from the cloth washing to prevent it from going to the filter cake.

MOC: PP, SS316, SS304, MS with Rubber Lining, PP FRP, other materials as requested. requested.

The filter press is equipped with Air operated Pneumatic Actuators for automatic opening and closing of the valves for slurry inlet and filtrate outlet. The actuator valve operates in auto mode i.e., Feeding, Washing, and Airing Process.

This system makes it possible to wash the cake residues off the cloth using water under pressure. Washing is performed simultaneously on both sides of the plate.

This device is installed in the upper part of filter press. It’s made up of washing rail, washing frame, washing frame driving travel device, inlet pipe, towing chain, washing pipe, nozzles, washing pipe lifting device, reducing motors etc. It can finish cloth washing in co-operation with plate shifting device under the control of PLC. This system makes it possible to wash the cake residues off the cloth using water under pressure. Washing is performed simultaneously on both sides of the plate.

When it doesn’t work, the device is placed behind the pressing plate, and when it works, after discharging all cakes, pressing plate will compact and release all filter plates, then retreat to the required position. The plate shifting device will move forward and enter into plate taking state under controlled program, and stop after taking the first plate. The washing device will stop after forwarding to the middle position of plate shifting space under the driving of reducing motors. Under spraying state, the washing pipes will move downward and upward to finish cloth washing actions, at this time, the plate shifting device will shift the first plate to the pressing end, then retreat to take the second plate….the process is repeated, until washing of last filter cloth.

• Regular washing of the cloth maintains its permanent permeability – the filtration resistance due to clogging of the cloth by the cake residues does not increase
• Lower loading of the feed pump leads to significant extension of its service life
• The service life of the cloth is extended

The dropping cake can be conveyed via the hopper to a conveyor, which usually transports the cake to a container.

Benefits and fields of use:

The container does not have to be installed directly under the filter press, but it can be outside the building, or in another room, which is easily accessible for Lorries transporting the containers.

After filtration, a liquid suspension remains in the turbidity channel; it can be removed and reliably transported back to the storage tank in order to prevent blockages and rehydration of the discharged cake when the filter press is open. After feeding is completed, operators can remove this sediment by rinsing the core. The rinse medium, mostly water, flows through the turbidity channel and absorbs the solids deposited there.

Filter press pump selection is based on a various numbers of criteria’s, characteristic of liquid, temperature, acidity, viscosity and required pressure are some of them.

The feed pump controls and feeds the slurry/feed in to the Filter press. Flow meter can be used in order to obtain the optimum filling level of the filter press. The feed pump usually increases up to 6 – 15 bar, the flow is controlled by a pressure switch, or a frequency (FM). Types Feed pumps used for Filter Press are Screw pump, Centrifugal pump and AOD pump. The type of pump and the material used depend on the character and properties of the pumped suspension.

Displacement pumps suitable for pumping non-abrasive substances, and can be regulated by a frequency converter.

Pumps suitable for high flow rates. Ideal high-speed filtration and for water pumping.

Air Operated DiaphragmPump. It is the best pump for a small filter press. It works with pressurized air. The main advantage of this pump is no overfeeding happens in the filter press.

Electric hydraulics are controlled by the NMP Electric Hydraulic Control System (EHCS), which monitors the status of the system and provides an emergency stop push button, which disconnects switch and touch screen control of the filter press hydraulics. Touch screen with very good resolution can provide all diagnosed information of the Filter Press and also allows adjusting the Filter Press process control.

The control part adopts system design concept, and adds auto running and check function. According to the actual working conditions, the control part has three working states for operators to use easily, that is, manual working state when installation and debugging; auto working state when auto running, and maintenance working state when the equipment is checked. To prevent error, every movable part has action interlocking function to protect when running automatically.

The touch screen use Siemens TFT display, it can input the process parameters at site and it’s easy to adjust process control process, with manual and automatic switching device. After auto check and diagnosis of the system, the system will always check whether the executive components is in normal state, if there is any exception, it will alarm on the display screen, to ensure the safe and reliable running of the filter press.

The functions can include: auto pressing and releasing, auto high pressure unloading, auto pressure holding, auto feeding, auto squeezing and discharging, auto blowing, auto cake discharge, auto plate shifting and taking, pause and the full course of close and open of drip tray. It can be controlled both manually and automatically, also can add infrared light curtain protection program according to requirements of clients.

Filter Press Controls

Our standard controls meet all the requirements that are necessary for the operation of your filter press. From the contactor controls for the smallest to the PLC controls to process control systems for complex plants. We use components from market leaders and well-known manufacturers. Your supply of spare parts is thus secured worldwide. Our standard controller is the SIMATIC® S7-1200® in conjunction with a 7” touch panel. Also, in this version, we offer you many possibilities to connect the filter press to your systems/plants.

To meet the requirements for the presentation and the operation of your processes, we also increase the performance of the operating devices and the controls. We are not bound to individual manufacturers. PLCs and process control systems from Siemens, Allen-Bradley, Schneider, ABB and several more have been successfully used by NMP.

• Supporting Steel Structure
• Pipes and Fittings