The invention relates to a plate-and-frame
filter press which comprises a support, two cross beams and a hydraulic compressing device arranged on the support, wherein a push plate, a stop plate and a plate-and-frame group are arranged between the two cross beams, one side of each plate frame is in a plane structure, another side of each plate frame is a frame convex, each plate frame has a concave structure inside, one side of each plate frame plane is provided with a plate frame extruding balance beam, a spring and a small
hydraulic cylinder are arranged between each plate frame and each plate frame extruding balance beam, a hydraulic oil opening is arranged on a small
hydraulic cylinder body, the hydraulic oil opening is connected with a hydraulic oil support
pipe, and a hydraulic oil
branch pipe on each plate frame is communicated with a hydraulic oil main
pipe on each plate frame. The position except a material inlet on the surface at one side of each plate frame is provided with an automatic filter cloth cleaning device. The plate-and-frame
filter press is simple in structure, each plate frame can be synchronously pushed in the process of filter-press, the plate frames can be compacted with one another, the material can not be lost, the plate-and-frame
filter press is high in filter-press efficiency, the
workload of the hydraulic compressing device can be effectively reduced, each plate frame can not deform or be damaged, and the plate-and-frame filter press has a function for cleaning a filter cloth on line.