The plate and frame filter press is a very mature dewatering equipment, which is widely used in European and American sludge dewatering projects. The filter press arranges the filter plates and filter frames with filtrate passages in parallel and alternately. Each group of filter plates and filter frames are sandwiched with filter cloth, and the filter plate and filter frame are pressed tightly with the pressing end to make the filter plate and filter plate A filter press chamber is formed between. The sludge flows in from the feed inlet, the water is discharged from the filtrate outlet through the filter plate, and the mud cake is accumulated on the filter cloth in the frame. After the filter plate and the filter frame are loosened, the mud cake is easily peeled off. The operation is simple and the filter cake contains High solid rate and strong applicability.

In the future, the interior of the plate and frame filter press will be more and more simplified, and its filtration speed and liquid content after filtration will also become lower and lower. The general plate and frame filter press is now capable of processing around 200T per day. In the future, it will be able to design a daily processing capacity of more than 1000T. Not only the processing capacity needs to be improved, the filter quality will also be improved, and the volume of solid interception may be reduced by nanometers, so that the filtrate can be more pure, and the moisture content of the filter cake can also be reduced. The method of squeezing the filter cake to reduce the moisture content of the filter cake cannot meet the needs of the industry at that time, and a high-temperature baking sheet may be added to the filter press equipment to further reduce the water content of the filter cake. At the same time, full automation and intelligence are also necessary skills for the future development of filter press equipment. The current filter press equipment still needs to be guarded by the staff. The future filter press equipment can perform simple self-processing for some small things. In the event of a major problem, it will automatically call the police, automatically deal with emergencies, retain various data, and wait for personnel to repair or correct.

The structure and working principle of the plate and frame filter press:

The plate and frame filter press is composed of a frame, a filter plate, a filter cloth, a pressing mechanism, a hydraulic system and an electric control system.

The frame part plays the role of supporting the pressing device and the filter plate, and is composed of a base, a push plate, a thrust plate, a head and a tail plate and a main board.

When working, the pressing device pushes the push plate to compress the filter plate and the filter cloth between the head and tail plates, so that a filter chamber is formed between the coagulated filter plate and the filter cloth. The tail plate feed hole enters each filter chamber, and the solid particles are trapped in the filter chamber and form a filter cake. The liquid passes through the filter cake and the filter cloth is discharged out of the machine through the outlet hole; if the filter cake needs to be washed, the stopper can be used Wash the filter cake through the washing liquid port on the plate; if the filter cake needs to be blown dry, compressed air can be passed through the washing liquid port or the feed port to blow the filter cake dry.

The frame structure of the plate-and-frame filter press is the same as that of the chamber-type filter press, except that the filtering part is one plate and one frame, the filter frame is a hollow structure, and the internal space is a filter chamber.

The liquid flow of the plate and frame filter press is divided into open flow and undercurrent. Open flow means that the filtrate is directly discharged out of the machine from the outlet hole of each filter plate; undercurrent means that the filtrate of each filter plate merges and is discharged out of the machine through the underpass of the outlet hole.