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Sudong filter press structure is reasonable to achieve high efficiency work

Sudong filter press has been optimized and upgraded by Sudong technicians for many years, and it is mainly composed of frame, pressing mechanism, filtering mechanism and electrical control part. The structure of the whole machine is reasonable, which can further improve the working efficiency of the filter press on the basis of ensuring safe operation. Below, Sudong will introduce the various components of the Sudong filter press for our customers.

1. Rack

The frame is the basic part of the filter press. Both ends have a pressing device, a thrust plate (fixed pressing plate), a pressing plate (movable pressing plate), and feet. Both sides are beams, which are used to support the filter plate and the filter frame. And pressure plate and install automatic pull plate device, etc.

a. Fixed pressure plate: It is connected with the support to place one end of the filter press on the foundation. The middle or upper part of the fixed plate of the chamber filter press is fed. According to the user's washing needs, there are four holes in the four corners. The holes in the two corners are the inlets for washing liquid or compressed gas, and the lower two corners are the liquid outlets (the underflow structure has a filtrate outlet).

b. Movable pressing plate: used to press the filter frame of the filter plate, and the rollers on both sides are used to support the pressing plate to roll on the rail of the beam.

c. Girder: It is a load-bearing component. According to the anti-corrosion requirements of the use environment, hard polyvinyl chloride, polypropylene, stainless steel coating or new anti-corrosion paint can be selected.

2. Compression mechanism

There are three main types: manual compression, mechanical compression, and hydraulic compression.

a. Manual compression: the filter plate is compressed by pushing the compression plate with a screw-type mechanical jack.

b. Mechanical compression: the compression mechanism is composed of a motor (equipped with advanced overload protector), a reducer, a gear, a lead screw and a fixed nut. When pressing, the motor rotates forward, driving the reducer and gear, so that the lead screw rotates in the fixed nut, and pushing the pressing plate to compress the filter plate. When the pressing force becomes larger and larger, the motor load current increases. When it reaches the current value set by the protector, the maximum pressing force is reached, and the motor cuts off the power supply and stops rotating. Because the screw and fixing nut are reliable The self-locking helix angle can reliably ensure the pressing state during the working process. When retracting, the motor reverses, and when the pressing block on the pressing plate touches the stroke switch, it retracts and stops.

c. Hydraulic compression: manual hydraulic compression and automatic hydraulic compression. Manual hydraulics do not require motors. The composition of the automatic hydraulic mechanism consists of a hydraulic station, a cylinder, a piston, a piston rod, and a connection between the piston rod and the movable pressure plate.

The structure of the hydraulic station consists of: motor, oil pump, overflow valve (pressure adjustment) reversing valve, pressure gauge, oil circuit, and oil tank. When the hydraulic pressing machine is pressing, the hydraulic station supplies high-pressure oil, and the component cavity formed by the cylinder and the piston is filled with oil. When the pressure is greater than the frictional resistance of the pressing plate, the pressing plate slowly compresses the filter plate. When the tightening force reaches the pressure value set by the overflow valve (displayed by the pointer of the pressure gauge), the filter plate, filter frame (plate and frame type) or filter plate (chamber type) are compressed, and the hydraulic pressure mechanical pressure needs to be locked Tighten the nut and the overflow valve will begin to unload. At this time, the motor power is cut off and the pressing action is completed. When retreating, loosen the lock nut, change the direction of the reversing valve, and the pressure oil enters the rod cavity of the cylinder. When the oil pressure can overcome the friction resistance of the pressure plate, the pressure plate begins to retreat. When the hydraulic compression is automatic pressure maintaining, the compression force is controlled by the electric contact pressure gauge. The upper limit pointer and the lower limit pointer of the pressure gauge are set at the value required by the process. When the compression force reaches the upper limit of the pressure gauge, the power supply Cut off, the oil pump stops supplying power, and the compression force drops due to internal leakage and external leakage that may occur in the oil circuit system. When it drops to the lower limit pointer of the pressure gauge, the power is turned on and the oil pump starts to supply oil. When the pressure reaches the upper limit, the power is cut off. The oil pump stops supplying oil, so that it circulates to achieve the effect of ensuring the pressing force in the process of filtering materials.

3. Filter mechanism

The filter mechanism is composed of a filter plate, a filter frame, a filter cloth, or a squeeze membrane filter plate. Both sides of the filter plate are covered by filter cloth. When a squeeze membrane is required, a set of filter plates consists of a membrane plate and a filter plate. The core plate of the diaphragm plate is covered with a diaphragm on both sides, and the outside of the diaphragm is covered with a filter cloth. The filter plate is a suitable ordinary filter plate. The material enters the filter chambers from the feed holes on the fixed plate. The solid particles are trapped in the filter chambers because their particle size is larger than the pore size of the filter medium (filter cloth), and the filtrate flows out from the outlet holes under the filter plate. When the filter cake needs to be squeezed dry, in addition to squeezing with a diaphragm, compressed air or steam can also be used to pass in from the washing port, and the airflow can flush the water in the filter cake to reduce the moisture content of the filter cake.

(1) Filtering method

The way the filtrate flows out is divided into open flow filtration and undercurrent filtration.

a. Open flow filtration: A water nozzle is installed on the outlet hole under each filter plate, and the filtrate flows out from the water nozzle intuitively.

b. Undercurrent filtration: the bottom of each filter plate is provided with a liquid outlet channel hole, and the liquid outlet holes of several filter plates are connected to form a liquid outlet channel, which is discharged from the pipe connected with the liquid outlet hole under the fixed plate.

(2) Washing method When the filter cake needs to be washed, there are sometimes one-way washing and two-way washing, undercurrent one-way washing and two-way washing.

a. Open flow one-way washing means that the lotion enters sequentially from the lotion inlet holes of the fixed plate, passes through the filter cloth and then the filter cake, and flows out from the non-porous filter plate. At this time, the outlet nozzle of the orifice plate is closed. , The outlet nozzle of the non-perforated plate is open.

b. Open-flow two-way washing means that the lotion enters the holes from the two sides above the fixed plate and washes twice, that is, the lotion is washed from one side and then from the other side. The outlet of the lotion is diagonal to the inlet. Line direction, so it is also called two-way cross washing.

c. Undercurrent unidirectional washing means that the washing liquid enters the perforated plate from the washing liquid inlet holes of the fixed plate in turn, passes through the filter cloth and then through the filter cake, and flows out from the non-porous filter plate.

d. Undercurrent two-way washing means that the lotion enters the two holes on the upper side of the fixed plate twice in succession, that is, the washing is first washed from one side, and then from the other side, the outlet of the lotion is diagonal Direction, so it is also called undercurrent two-way cross washing.

(3) Filter cloth: Filter cloth is a main filter medium. The selection and use of filter cloth has a decisive effect on the filtering effect. When choosing the filter cloth, the appropriate filter cloth should be selected according to the pH value of the filter material, solid particle size and other factors. The material and pore diameter are to ensure low filtration cost and high filtration efficiency. When using, ensure that the filter cloth is flat and not compromised, and the pore size is unobstructed. Commonly used filter cloths are mainly as follows (there are woven fabrics and non-woven fabrics such as monofilament, multi-strand filament, short filament, etc.). In order to prevent dripping, polyester and acrylic fabrics can be used to produce laminated filter cloths, polypropylene and other surfaces that can be glued.

4. Electrical control part

There are three main types: Mechatronics control, PLC program control, HMI touch screen (human-machine interface) control.

In addition to the above four necessary parts, Sudong can also install automatic pull plate devices, automatic liquid collection and mud storage devices, and automatic flushing devices for the filter press according to customer needs to meet customer automation requirements. With the advancement of science and technology, customers' requirements for filter presses will still increase. Sudong will continue to focus on the structural optimization of filter presses, and strive to provide customers with more efficient filter press products.


Jiangsu Sudong Chemical Machinery Co., Ltd. was established in June 1956. It has been engaged in the research, design and manufacture of filter presses for more than 30 years.
 Top 10  brands of filter press in China
 Solid liquid separation engineering technology research center




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