What is the principle of frame plate filter press?

The composition of the hydraulic pressing mechanism of the filter press is composed of the structure of the hydraulic station, the oil cylinder, the piston, the piston rod and the Havland card hydraulic station connected by the piston rod and the compression plate, including the motor, the oil pump, the relief valve (adjusting the pressure), the reversing valve, the pressure gauge, the oil circuit and the oil tank. When the pressure is greater than the frictional resistance of the compression plate running, the compression plate slowly compresses the filter plate, when the compression force reaches the pressure value set by the relief valve (displayed by the pressure gauge pointer), the filter plate, the filter frame (plate and frame type) or the filter plate (chamber type) are compressed, and the relief valve begins to unload, at this time, cut off the motor power supply, the compression action is completed, and when it is returned, the reversing valve is reversed, and the pressure oil enters the rod cavity of the oil cylinder. When the oil pressure can overcome the frictional resistance of the hold-down plate, the hold-down plate begins to retreat. hydraulic....

It is a filter chamber composed of multiple filter plates and filter frames superimposed, and the pressure is used as the driving force of filtration. The filter press is intermittent operation, and there are three types of plate and frame filter presses, chamber filter presses and vertical filter presses. At present, the domestic mainly chamber type and plate and frame type, the chamber filter press belongs to the improved type of plate and frame filter press.

Compared with the plate and frame filter press, it has the characteristics of good sealing, high filtration pressure and low moisture content of filter cake. The filter press is composed of the following parts: 1, frame part 2, filter part 3, pull plate part 4, hydraulic part 5, flap mechanism 6, electronic control part.

The basic operation process of the filter press is: closing the flap (optional) -- pressing the filter plate -- (holding pressure) -- feeding filtration -- (holding pressure) -- opening the flap (optional) -- return stroke) -- loosening the filter plate -- (pulling the plate) -- pulling the plate to unload the cake (manual or automatic) -- finishing the filter cloth or cleaning the filter cloth (manual or automatic) (optional) -- closing the flap (optional) and so on. The principle of filtration is as described by the following brothers.

According to different filter materials, different filter cloths, polypropylene, warp and so on (plain, twill, satin), single-sided calendering, double-sided calendering. If it is difficult to filter, it is necessary to consider the temperature, pH, and washing (pickling, alkali washing) of the material. The choice of filter press can be based on the actual choice of diaphragm model or filter press with additional functions.

Such as washing, shocking. Varicose, flap, storage hopper. belt conveyors and so on.

As for the plate and frame filtration pressure is not high, the function is relatively simple.

Details of the previous work unit hehe. Now engaged in marine filtration equipment, I hope to help you!

First of all, positive pressure strong pressure dehydration, also known as slurry dehydration, that is, a certain number of filter plates are closely arranged into a row under the action of strong mechanical force, a filter chamber is formed between the filter plate surface and the filter plate surface, the filter material is sent into the filter chamber under strong positive pressure, the solid part of the filter material entering the filter chamber is intercepted by the filter medium (such as filter cloth) to form a filter cake, and the liquid part is discharged through the filter medium, so as to achieve the purpose of solid-liquid separation, with the increase of positive pressure pressure, the solid-liquid separation is more thorough, but from the energy and cost aspects, Too high a positive pressure is not cost-effective. After slurry dehydration, the filter press equipped with rubber extrusion membrane enters the back of the extrusion membrane and pushes the extrusion membrane to further dehydrate the extruded filter cake, which is called extrusion dehydration. After slurry dehydration or extrusion dehydration, the compressed air enters one side of the filter cake in the filter chamber through the filter cake, and carries liquid water from the other side of the filter cake through the filter cloth to discharge the filter chamber and dehydrate, which is called wind blowing dehydration.

If the filter cloth is coated on both sides of the filter chamber, the liquid part can be evenly discharged through the filter cloth on both sides of the filter chamber, and the filter chamber is dehydrated on both sides. After the dehydration is completed, the mechanical compression force of the filter plate is relieved, and the filter plate is gradually pulled apart by a single piece.

Sand washing sludge dewatering process: The working principle of modern plate and frame filter press.

The plate-and-frame filter press consists of alternating filter plates and filter frames to form a set of filter chambers. The surface of the filter plate has grooves and protruding parts to support the filter cloth. There are through-holes in the corners of the filter frame and filter plate, which are assembled to form a complete channel for the passage of suspension, wash water and the introduction of filtrate.

The plate and the frame are supported on the cross beam by handles on both sides, and the plate and the frame are pressed by the pressing device. The filter cloth between the plate and the frame acts as a sealing gasket. The suspension hydraulic pressure is fed into the filter chamber by the supply pump, and the filter residue is formed on the filter cloth until the filter chamber is filled.

The filtrate passes through the filter cloth and flows along the groove of the filter plate to the corner channel of the plate frame, where it is discharged centrally. After filtration, clean washing water can be used to wash the filter residue. After washing, compressed air is sometimes introduced to remove the remaining washing liquid.

Then open the filter press to remove the filter residue, clean the filter cloth, re-press the plate and frame, and start the next working cycle.

Is a plate-and-frame filter press the same as a diaphragm filter press? Many friends who don't know much about the filter press regard the plate and frame filter press and the diaphragm filter press as the same kind of machinery, in fact, there is a difference between the two.

The basic principle and structure of the plate and frame filter press and the diaphragm filter press are the same, the difference is that the filter plate used in the diaphragm filter press is double-sided with a diaphragm cavity. When the material filtration is completed, a certain pressure of gas (liquid) is injected into the diaphragm cavity to make the diaphragm bulge up and reverse the spinning of the filter cake, so as to achieve the purpose of reducing the moisture content of the filter cake.

1. The structure of the filter plate is different. The filter chamber of the plate-and-frame filter press is composed of two kinds of filter plates staggered, one solid filter plate and one frame filter plate. The diaphragm filter press uses two different filter plates, one solid filter plate and one hollow filter plate.

The frame filter plate is like four strips surrounding the city, and the hollow filter plate is cast together in two layers to form a large gap in the middle of the filter plate, which is the hollow filter plate.

2. The formation of the filter cavity is different. The filter chamber of the plate-and-frame filter press needs two solid filter plates and a frame filter plate, and the diaphragm filter press is composed of a solid filter plate and a hollow filter plate.

3. Different styles of filter cloths. The diaphragm filter press uses two filter cloths, which are connected in the middle to form a filter cloth monomer. The filter cloth of the plate-and-frame filter press is a square filter cloth, which is completely different from the previous two types of equipment.

The filter cloth of the diaphragm filter press adopts the wrapping method, and one of the two layers is flattened after passing through the small hole in the middle of the filter plate to wrap the filter plate. The plate-and-frame filter press can be placed directly between the filter plates.

4. The filter plate used in the diaphragm filter press is double-sided with a diaphragm cavity, and compared with the filter plate of the frame filter press, the diaphragm filter plate has two filter surfaces that can be moved back and forth: diaphragm. When a press medium (e.g. compressed air) is introduced behind the diaphragm, these movable diaphragms bulge out in the direction of the filter chamber, i.e. the cake is pressed again at a high pressure after the filtration process.

The moisture content of the filter cake can be 10-40% lower than that of ordinary filter plates. It can save a lot of follow-up costs. When washing the filter cake, the pressure of the diaphragm can be used to reduce the amount of washing water and achieve better results.

The diaphragm filter press has the advantages of high pressing pressure, good corrosion resistance, convenient maintenance, safety and reliability, etc., and is a customer in metallurgy, gas, papermaking, coking, pharmaceutical, food, brewing, fine chemical and other industries. The plate-and-frame filter press is realized by applying mechanical force on one side of the filter medium, and it is now an indispensable machinery in many industrial productions.

Agree upstairs. Most manufacturers of chamber filter presses are intermediate feeding, and the filter plate is a whole filter plate. The filter plate of the plate-and-frame filter press is composed of two parts, the filter plate and the filter frame, which are combined into a plate.

The diaphragm filter plate will have air inlet holes on the side of the filter plate, and the middle is hollow, which will bulge up after inflation.

The difference between the plate and frame filter press and the chamber filter press is only that the filter plate is different, and the position of the feed port is different. There is no difference in other aspects. The shape of the filter plate of the diaphragm filter press is the same as that of the chamber filter press, with two more air inlet holes, and the hollow can be inflated or water bulged.

The structure of the filter plate is different: the chamber diaphragm filter press is composed of two different filter plates, one is a solid filter plate, and the other is a hollow filter plate with a diaphragm cavity on both sides, which are arranged in sequence. The plate-and-frame filter press is also composed of two different filter plates staggered and spliced, a solid filter plate and a frame filter plate, which are also arranged in sequence;

And the middle of the filter plate of the diaphragm filter press is hollowed out, and the feeding material is conveyed from the middle. The plate and frame filter press is solid in the middle, and there is a hole in each of the four corners for feeding or washing.

The filter cloth is different: the diaphragm filter press uses two filter cloths, which are connected in the middle to form a filter cloth monomer. The filter cloth of the plate-and-frame filter press is a square filter cloth, and the filter cloth and diaphragm filter plate are completely different.

The feeding position is different: the diaphragm filter press feeds from the middle, and the plate and frame filter press feeds the corners of the filter plate;

Working principle of plate and frame filter press: plate and frame filter press is used for the separation of solids and liquids.

Compared with other solid-liquid separation equipment, the mud cake filtered by the filter press has a higher solid content and excellent separation effect.

The basic principle of solid-liquid separation is that the mixed liquid flows through the filter medium (filter cloth), the solids stay on the filter cloth, and gradually accumulate on the filter cloth to form a filter mud cake. The filtrate part penetrates the filter cloth and becomes a clear liquid that does not contain solids.

With the progress of the filtration process, the filter cake filtration begins, the thickness of the mud cake gradually increases, and the filtration resistance increases. The longer the filtration time, the higher the separation efficiency.

Specially designed filter cloths can retain particles with a particle size of less than 1 m. In addition to the excellent separation effect, the filter press has excellent separation effect.

In the actual operation of the plate and frame filter press, if the liquid level of the oil tank of the hydraulic station is low, it may be caused by the leakage of the hydraulic valve or oil pipe, and the hydraulic oil level is too low, and the compression pressure will not reach the set value, and the equipment compression process time will be too long; If the compression pressure of the filter plate is set too small, the filtrate will drip through the middle of the filter plate during the filtration process, and even the material will be sprayed out through the middle of the filter plate.

Amber Ning. Check the operating parts of the filter press regularly. Once the hydraulic oil level is found to be too low, check the cause of oil leakage in time and repair and restore it, and replenish the oil to the hydraulic station in time to ensure that the requirements of the normal operation of the equipment are met.

Generally, the oil leakage will appear at the oil pipe joint or hydraulic valve, the reason is generally that the valve is damaged or the sealing ring is damaged, and the damaged valve or broken sealing ring should be replaced in time.

During the compression process of the filter press, if there is an abnormal noise in the hydraulic system, it may be caused by loose fasteners or emulsification of hydraulic oil. Solution: Check the fasteners of the system, and if they are loose, strengthen them in time. For abnormal or emulsified hydraulic oil, replace the hydraulic oil.

The main difference between plate and frame filter presses and diaphragm filter presses is their appearance. The filter plate of the diaphragm filter press is spliced together by two filter plate layers, and the hollow is left empty, so that it can be expanded and retracted like a diaphragm under the expansion of the filler, while the filter plate of the plate and frame filter press is all different, and it is completely empty in the middle for storing the filter cake. It is like a bottomless bamboo basket surrounded by four filter strips, and it can also be inlaid with a filter cloth on the edge of the empty space, so that the filter cloth can be used to intercept and filter.

Plate-and-frame filter plates and diaphragm filter plates play different roles in plate-and-frame filter presses and diaphragm filter presses respectively, and the focus is different. The focus of the filter plate of the plate and frame filter press is to build the filter chamber, especially the hollow structure used, which reserves a large space for the filter cake. In addition to dividing the filter chamber into an independent filter chamber, the diaphragm filter plate also provides the conditions for the attachment of the filter cloth, which is directly borne by the secondary extrusion and dehydration of the filter cake, because the diaphragm filter plate can be expanded, when the diaphragm filter plate expands how much space, it will correspondingly reduce the volume of the original filter cake, so as to further squeeze out the filter cake with the moisture hidden in it.

Summary. The difference between the diaphragm filter press and the plate and frame filter press is mainly in the difference in filtration method and structural design. The diaphragm filter press uses a movable diaphragm to divide the filter medium into two independent spaces, and realizes the filtration of the solid-liquid phase by compressing the diaphragm.

This method can realize reverse purging, wiping and other functions, and is suitable for processing high-concentration, fine-particle, viscous materials, etc. The plate-and-frame filter press is to filter the filter medium in the plate-and-frame structure, and realize the solid-liquid separation through the filter plate and the filter frame spaced in the plate and frame. This method is suitable for handling low-concentration, coarse-grained, non-cohesive materials, etc.

Overall, diaphragm filter presses offer greater operational flexibility and adaptability to handle more complex filtration requirements. Plate-and-frame filter presses, on the other hand, are relatively simple and suitable for general filtration tasks.

The difference between the diaphragm filter press and the plate and frame filter press is mainly due to the difference in filtration method and structural design. The diaphragm filter press uses a movable diaphragm to divide the filter medium into two independent spaces, and realizes the filtration of the solid-liquid phase by compressing the diaphragm. This method can realize reverse purging, wiping and other functions, and is suitable for dealing with high-concentration, fine particles, viscous materials, etc.

The plate-and-frame filter press is to filter the filter medium in the plate-and-frame structure, and realize the solid-liquid separation through the filter plate and the filter frame spaced in the plate and frame. This method is suitable for handling low-concentration, coarse-particle, curved non-cohesive materials, etc. Overall, diaphragm filter presses offer greater operational flexibility and adaptability to handle more complex filtration requirements.

Plate-and-frame filter presses, on the other hand, are relatively simple and suitable for general filtration tasks.

I'm sorry I don't understand, but can you elaborate on that?

The difference is mainly in the filtration method and structural design. The diaphragm filter press is divided into two spaces through the diaphragm for filtration, which is suitable for processing high-concentration, fine particles, viscous materials, etc., and has the functions of reverse purging and wiping. Plate and frame filter press realizes solid-liquid separation through filter plate and filter frame, which is suitable for processing low concentration, coarse particles, non-cohesive substances, etc.

The diaphragm filter press is more flexible in operation and suitable for complex filtration requirements, while the plate and frame filter press is suitable for general filtration tasks.