A filter press, comprising a frame, a hydraulic system, a plurality of filter plates, a plurality of filter chambers, a feed pump, a high-pressure clean water pump, a control system, a rotating plate, a cake removal knife, a plurality of squeeze discs, a plurality of squeeze disc sleeves, a drive shaft, a brake, a left pull rod, a right pull rod, two pull rod discs, a connector, and a plurality of clutches;
- wherein the plurality of filter plates are arranged on the frame, the two pull rod discs are respectively arranged at two opposite sides of the frame, the drive shaft passes through the plurality of filter plates, a center of the drive shaft defines a feed channel communicated with the feed pump, the rotating plate is connected to the drive shaft, and configured to rotate along with the drive shaft, the left pull rod and the right pull rod are symmetrically relative to the axis of the drive shaft and passes through the plurality of filter plates and the two pull rod discs, the control system is connected to the hydraulic system and the brake, the brake is connected between the clutches and the drive shaft and configured to control the clutches to move forward and away from the drive shaft, the brake is connected to the two pull rod discs and configured to control axial movement of the left pull rod and the right pull rod through the two pull rod discs, one end of the connector is connected to the left pull rod and the right pull rod, and the other end of the connector is connected to the plurality of squeeze discs, the hydraulic system is configured to compress and release the plurality of filter plates;
- the plurality of filter chambers are formed between an inner cylindrical surface of two adjacent filter plates of the plurality of filter plates and two inner end surfaces in the inner cylindrical surface;
- the plurality of filter plates are spaced apart by a support part and a liquid-permeable pressure equalizing part;
- the plurality of squeeze discs are arranged at the squeeze disc sleeve and on the two inner end surfaces, four cylindrical holes are arranged around each filter plate of the plurality of filter plates, wherein a first upper cylindrical hole of the four cylindrical holes is connected to the high-pressure clean water pump;
- two washing water channels are connected to each filter chamber of the plurality of filter chambers, wherein a first washing water channel of the two washing water channels passes through a filter cloth from the plurality of filter plates into the plurality of filter chambers to form a reverse washing channel;
- a second washing water channel of the two washing water channels passes through the filter cloth from the plurality of filter chambers into the plurality of filter plates to form a normal washing channel;
- the control system controls a bidirectional valve to be opened, and washing water enters the normal washing channel and the reverse washing channel in turn;
- washed water passes through cross recesses on the plurality of filter plates into a washing water collector via a first lower cylindrical hole of the four cylindrical holes;
- the washing water collector is provided with a filter screen, and a particulate filter cake is discharged directly into a cake discharge port;
- clear washing water flows into a clean water tank, and a slurry is fed into the filter press by the feed pump;
- a second lower cylindrical hole of the four cylindrical holes around the each filter plate is connected to a filtrate receiving and discharging pipeline or a collecting device;
- and a second upper cylindrical hole of the four cylindrical holes around the each filter plate acts as a feed channel.