Filter press and filter press of spiral vibration cake unloading by pulling apart filter plates twice

A filter press, comprising a frame, and a power component, a plurality of filter plates and a vibration cake unloading device arranged on the frame, wherein:

• the filter plates are driven by the power component to move to and fro along the frame to be at a pressure filtration position and an unloading position;
• and
• the vibration cake unloading device comprises a driving component and a vibration shaft arranged longitudinally, protrusions are provided on an outer circumferential wall of the vibration shaft, when the filter plates are located at the unloading position, in a process that the driving component drives the vibration shaft to rotate around its own axis, the protrusions on the vibration shaft collide with the filter plates to assist in unloading,
• wherein the power component comprises an oil cylinder and an auxiliary power component;
• in a longitudinal direction, all the filter plates are divided into a first part of filter plates and a second part of filter plates, and the oil cylinder drives all the filter plates to be at the pressure filtration position;
• when the oil cylinder retracts to a fully retracted state, the filter plates in the first part of the filter plates are pulled apart by a predetermined distance to form an unloading space;
• and
• the auxiliary power component drives adjacent filter plates in the second part of filter plates to be pulled apart by a predetermined distance to form an unloading space, and meanwhile a distance between the filter plates in the first part of the filter plates decreases.