How Filter Plate Broken1. When the sludge is too thick or leaves dry lumps, the feeding port will be blocked. At this time, there is no medium between the recessed filter plates, and only the pressure of the hydraulic system itself remains. At this point, the board itself is easily damaged due to prolonged stress. 2. When the feed is insufficient or the feed contains inappropriate solid particles, it will also cause the board and the frame itself to be overstressed and thus damaged. 3. If the outlet is blocked by solids, or the inlet valve or outlet valve is closed at startup, there will be no pressure leakage, resulting in damage. 4. When the chamber filter plate is not cleaned, sometimes the medium will leak. In the event of a leak, the edges of the board racks will be flushed into small trenches one by one. A large amount of medium leakage will result in no pressure rise and no mud cake formation.

Which kind of filter cloth is better?During the filtration process, the solid particles (fine particles) of the amorphousbb of the filter press and reduces the leakage of porous water between the filter plates of the filter press. The surface high temperature curing technology has a good effect on solving the practical problems of the filter press. Only the monofilament filter cloth can maintain a stable structure without deformation, but the impact resistance and compressive strength of the monofilament filter cloth are not higher than that of the multifilament filter cloth, which is easy to be damaged. At present, there are many typesv filter cloths on the market. According to different materials, there are many chemical fibers; in terms of structure, they are mainly textile and chemical fiber felt, cardboard and filter paper.The filter cloth used in the diaphragm filter press is "high temperature setting (calendering) filter cloth". After the high temperature setting (calendering) filter cloth, the shape of the pores between the cotton yarns changes from a positive bell mouth shape to a reverse bell mouth shape.Therefore, filter cloth manufacturers have produced monofilament and multifilament filter cloths to overcome the shortcomings of monofilament filter cloths. The monofilament filter cloth is used as the sealing layer, and the multifilament filter cloth is used as the support point layer. 

Why Filtered Cakes UnevenThere are two main reasons for the uneven mud cake pressed by the Chamber filter press.One is that the feed channel is blocked, that is, the feed hole in the center of the recessed filter plate is blocked by mud.Therefore, we must first check whether there is residual mud in the feeding channel, and rinse the channel to ensure smooth feeding.Second, the filter cloth is blocked (this could be judged by fast rising feeding pressure. The solution is that we wash PP filter cloth with a high-pressure water gun to ensure that the pores of the filter cloth are not blocked. Therefore, during the use of the filter press, we should regularly clean the filter cloth and feed holes to avoid such problems.

PAC & PAM Function During Filter Press Working Generally speaking, in order to speed up the filter press process and reduce the water content, some chemicals are added. Commonly used are cationic polyacrylamide and polyaluminum chloride. The right amount of addition can play a role in binding the sludge and speed up the filter press process. According to the different filter presses used, the dosage of chemicals is also different. For example, the belt filter press adds more chemicals, and the plate and frame filter presses add less chemicals. Polyaluminum chloride (PAC for short, usually also called water purifying agent or coagulant) has a high degree of electrical neutralization and bridging effect on colloids and particulates in water, and can strongly remove micro-toxic substances and heavy metal ions, with stable properties. Polyacrylamide (PAM for short, also divided into anion (HPAM) cation (CPAM), non-ionic (NPAM) is a linear polymer, is one of the most widely used water-soluble polymer compounds, polypropylene. Amide and its derivatives can be used as effective flocculants, thickeners, paper strengtheners and liquid drag reducers, etc., and are widely used in water treatment, papermaking, petroleum, coal, mining and metallurgy, geology, textile, construction and other industrial sectors) As for how much to add, add PAC or PAM or both. This requires the pharmaceutical manufacturer to combine with the water sample after the experiment. Proper use of the pharmaceutical will directly affect the filtration efficiency of chamber filter press. 

Plate and Frame Filter Press InformationThe plate and frame filter press can be applied to the suspension with large or almost incompressible filter residue. The solid particle concentration of the suitable suspension is generally below 10%.Hydraulic Plate Filter Press operating pressure is generally 0.3 to 0.6 MPa, and can be up to 3 MPa or higher in special cases. The filter area can be increased or decreased with the number of plates and frames used.The plate frame is usually square, the inner length of the filter frame is 200-2000 mm, the frame thickness is 16-80 mm, and the filter area is 0.5-1200 square meters. The plate filter press are pressed by manual screw, electric screw and hydraulic pressure. Plates and frames are manufactured from materials such as wood, cast iron, cast steel, stainless steel, polypropylene and rubber.

How Sludge Filter Press WorkMatching with a ceramic plunger pump, filter press will be full of sludge. After the sludge filter press dewaters the sludge, separate solid and liquid, mud cakes are formed, and the clean water is filtered out and can be directly recycled to re-production.The mud is filtered by the filter chambers with filter cloth, the solid particles inside are retained and become mud cake and remain in the middle of the filter plate.  And the liquid is filtered out for another process.The filter chamber is formed by pressing all the neatly arranged filter plates by the pressing plate. When the entire dehydration process is completed, the pressing plate needs to be returned, the filter plates are separated one by one, and the solid mud cakes trapped in the middle will fall down one by one. The process of unloading the cake can be operated manually or the auto filter press of an automatic plate pulling function.

Import and Export Status of Filter PressChina "filter press" HS code is "84212910". Judging from the import and export volume, my country's export volume is much greater than the import volume. According to statistics, from January to November 2021, the number of checkpoints for filter presses export in China was 407,100, and the number of imports was 2,353.Judging from the import and export amount, China imports high-end filter presses and exports low-end filter presses. According to statistics, from January to November 2021, the export value of China filter press is 89.3701 million US dollars, and the import value is 22.0909 million US dollars.From this status, our company should increase the filter press improvement investment, increase technology study to meet high-end filter press requirements.

How to Install Filter ClothWhen installing the filter cloth of the automatic filter press, attention should also be paid to the method. If the installation is not in place, not only the filtering effect will be greatly reduced, but also the filter cloth and even the equipment will be damaged.  First, sew the center holes of the two pieces of filter cloth together. One of them is folded in half and then rolled into a cylindrical shape. Pass through the feed port in the middle of the filter plate, and then unroll the filter cloth that has passed through. The filter cloths on the other side of the same filter plate are tied together.

Current Filter Press and Undercurrent Filter Press UsageIn general filter presses, open-flow drainage is used, so we are familiar with chamber filter presses or diaphragm filter presses with open-flow drainage. We see such filter presses, when the filtrate passes through the filter chamber Then directly through the drainage pipe under the filter plate, and directly outside the equipment through the faucet. The undercurrent filter press equipment is designed to collect the filtrate under the faucet, and the filtered design is collected through the pipeline. The conventional method is to connect the faucet under the filter plate of the filter press to a sealed hose, and a larger pipe connected to all the hoses is designed under the hose, so that the liquid can be well protected.  Undercurrent filter press is generally suitable for toxic, odorous, volatile and flammable materials.

How to Distinguish Bad Filter Plates and Good Filter Plate1. To distinguish the bad and the good filter plate of the slurry filter press, you must first check whether the filter plate is in good condition as a whole, and whether the surface is smooth and clean. It should be very flat and clean, because it is an important position which affects the sealing of the filter chambers, and there must be no damage. If the filter chamber of the filter press cannot meet the most basic standards, the filter press cannot work. In the concave part of the filter plate, reduce all silk marks as much as possible. Because the internal working pressure of the filter press is very high, in the future application, the filter plate is usually broken and damaged from the filter plate wire mark due to the strong working pressure.2. Smell the filter plate. The filter plate of a good cloth filter press itself does not contain any choking or strong taste, but only contains a shallow high-pressure polyethylene smell. If the filter plate of the filter press itself contains rich vapor when it is not in use, it means that the filter plate is either added with too many additives in the whole production process, or it is re-melted and forged with waste material.3. The key is to touch. When a good filter plate is touched, all the smoke and dust cannot be brought out. The base butadiene will produce a thin layer on the surface of the filter plate, which will look like jade, but much less.

Why Ceramic Plunger Pump Working with noise?1. The noise of the ceramic plunger pumpThe phenomenon of air suction is one of the main reasons for the high noise of the hydraulic slurry pump. When air is mixed into the oil, it is easy to form cavitation in its high-pressure area, and it spreads in the form of pressure waves, causing the oil to oscillate and cause the system to produce cavitation noise. 2. Noise of relief valveThe overflow valve is prone to high-frequency noise, which is mainly caused by the unstable performance of the pilot valve, that is, the noise generated by the air vibration caused by the high-frequency oscillation of the pressure in the front chamber of the pilot valve.The main reasons are as follows:(1) Air is mixed into the oil, and cavitation is formed in the front cavity of the pilot valve, which causes high-frequency noise. At this time, the air should be exhausted in time and the outside air should be prevented from re-entering.(2) The needle valve is excessively worn due to frequent opening during use, so that the needle valve cone surface and the valve seat cannot be tightly fitted, resulting in unstable pilot flow, pressure fluctuations and noise. At this time, it should be repaired or replaced in time.(3) The pressure regulating function of the pilot valve is unstable due to the fatigue deformation of the spring, which makes the pressure fluctuate and causes noise. At this time, the spring should be replaced. 3. Noise of hydraulic cylinder Durning Ceramic Piston Pump woking(1) The oil is mixed with air or the air in the hydraulic cylinder is not completely exhausted, and cavitation occurs under the action of high pressure, which causes a lot of noise. At this time, the air must be exhausted in time.(2) The oil seal of the cylinder head is too tight or the piston rod is bent, and noise will also be generated due to the tension during the movement. At this time, it is necessary to replace the oil seal or straighten the piston rod in time.

How to improve the dewatering efficiency of the plate and frame filter press?1. Optimization of plate and frame filter press equipmentThe filter press dehydration effect is not good, the first consideration is to optimize and adjust the filter press prepared working parameters, such as the type of filter cloth, the pressing pressure value, and the operating procedure Etc., while ensuring the dehydration effect, the equipment efficiency is greatly improved.How to improve the dewatering efficiency of the plate and frame filter press?(1) Clean the filter cloth regularly and replace the corrugated filter with larger air permeability of filter cloth to increase the filtering speed.(2) Increase the pressing pressure by adding an air compressor.(3) Adjust the operating procedures, first squeeze and then press or press first and then reverse squeeze, compare the two dehydration effects, and constantly adjust the pressing and squeezing time and the cycle times of the two processes, observe the change of moisture.(4) Change the feeding method. Generally, the filter press is opened once the feeding is completed. Start pressing and squeezing, you can try to pre-press after the feeding is completed, then feed the material for second time, and continue to squeeze.2. Reasonable use of dehydrating agent for plate and frame filter pressMedicament is an important factor affecting filter press dehydration. Commonly used mainly include organic flocculation, inorganic flocculant, microbial flocculant, composite flocculant, coagulant aid etc. The dosage of inorganic flocculant is large and the effect is general; the dosage of organic flocculant small, but expensive, and has certain biological toxicity; quicklime and other coagulant aids great damage to the filter cloth and introduction of impurities; the application environment of biological flocculants is relativelyFor harsh. In the actual production process, multiple agents are often used in combination to ensure the dehydration effect.