The feed plunger pump of the filter press is a key equipment used for conveying materials in the filter press system. It is mainly responsible for high-pressure conveying of the slurry to be filtered (such as sludge, ore slurry, chemical slurry, etc.) to the filter chamber of the filter press, and achieving solid-liquid separation through pressure. Its working principle is based on the reciprocating motion of the plunger, which generates pressure through volume changes and has the characteristics of high pressure, stable flow rate, and adaptability to high concentration materials.

　　1、 Basic structure and working principle

　　1. Core structure

　　Power end: composed of an electric motor, a reducer, and a crankshaft connecting rod mechanism, which converts rotational motion into reciprocating linear motion of a plunger.

　　Hydraulic end: including plunger, cylinder body, suction valve, and discharge valve. The plunger and cylinder form a sealed chamber, which changes the volume of the chamber through reciprocating motion to achieve suction and discharge.

　　Sealing device: using packing seal or mechanical seal to prevent slurry leakage and adapt to high-pressure working conditions.

　　2. Workflow

　　Inhalation stage: The plunger moves backwards, the volume inside the cylinder increases, the pressure decreases, the suction valve opens, and the slurry is sucked into the cylinder.

　　Discharge stage: The plunger moves forward, the volume of the cylinder chamber decreases, the pressure increases, the discharge valve opens, and the slurry is high-pressure pressed into the filter chamber of the filter press.

　　Repeating the above process, continuously feeding the filter press.

　　2、 Main features and advantages

　　High pressure conveying capacity: The working pressure can reach 10-30MPa, meeting the high feed pressure requirements of the filter press, promoting dewatering and compaction of the filter cake.

　　Stable flow rate: The plunger movement stroke is fixed, and the flow rate is not affected by pressure fluctuations, ensuring uniform feeding of the filter press and improving filtration efficiency.

　　Suitable for high concentration materials: The flow channel is wide and not easily blocked, and can transport slurry containing particles and high viscosity (such as sludge, slurry, etc.).

　　Flexible adjustment: The flow rate can be adjusted by changing the motor speed, plunger stroke, or quantity to meet different working conditions.

　　Sturdy structure: Made of wear-resistant materials such as high chromium cast iron and ceramics, the plunger and valve components extend their service life.

　　3、 Applicable scenarios

　　Environmental protection industry: municipal sludge dewatering, sludge pressure filtration in industrial wastewater treatment.

　　Mining: Slurry filtration of metallic and non-metallic minerals (such as gold and graphite).

　　Chemical industry: solid-liquid separation of chemical raw materials and waste residues (such as pigment and fertilizer production).

　　Food and medicine: filtration of some high viscosity materials (using sanitary grade materials).

　　4、 Selection and maintenance points

　　1. Selection parameters

　　Flow rate: Calculate the required flow rate (m ³/h) based on the filter chamber volume and filtration time of the filter press.

　　Pressure: It is determined based on the material characteristics (viscosity, particle size) and the working pressure of the filter press, and usually needs to be 1-2MPa higher than the required pressure of the filter chamber.

　　Material characteristics: corrosiveness, particle size, temperature, etc., which affect the material selection of the pump (such as stainless steel used for corrosive materials).

　　2. Maintenance points

　　Regular inspection of seals: The packing seal needs to be replaced regularly, and the mechanical seal needs to be checked for end face wear to prevent leakage.

　　Lubrication system: Regularly add lubricating oil to ensure good lubrication of power end bearings, crankshafts, and other components.

　　Replacement of vulnerable parts: components such as plungers, valve seats, and valve discs that are prone to wear need to be regularly inspected and replaced in a timely manner to avoid a decrease in efficiency.

　　Cleaning and maintenance: After shutdown, the pump chamber needs to be cleaned to prevent residual materials from solidifying and blocking the flow channel.

　　5、 Comparison with other feed pumps：