Summary of common fault problems of filter presses
First, the damage of the plate itself. The reasons for the damage to the plate itself are:
1. When the sludge is too thick or the dry block remains, it will cause the blockage of the feed port. At this time, there is no medium between the filter plates, only the pressure of the hydraulic system itself is left. At this time, the plate itself is easily pressed for a long time. Cause damage.
2. If the supply is insufficient or the feed contains inappropriate solid particles, the plate frame itself will be stressed too much to be damaged.
3. If the outlet is blocked by solids or the supply valve is closed or the valve is closed when starting, the pressure is not leaked, causing damage.
4. When the filter plate is not cleaned, it sometimes causes the medium to leak. Once it leaks out, the edge of the plate frame will be washed out with a small groove. The pressure of the medium will not increase, and the mud cake cannot form. .
Corresponding method for troubleshooting:
1. Use nylon cleaning to remove the mud from the feed port.
2, complete this cycle, reduce the filter plate volume
3. Check the filter cloth, clean the drain, check the outlet, open the corresponding valve, release the pressure
4, carefully clean the filter plate, repair the filter plate
The repair technology of the filter plate is as follows;
After a few years of use, the filter plate washes out some grooves at the corners for some reason. Once the groove marks appear, it will expand rapidly until it affects the formation of the filter cake. At first the filter cake became soft, then became semi-sludge, and finally the filter cake could not be formed. Due to the special material of the filter plate, it is difficult to repair and can only be replaced with new ones, resulting in high spare parts cost. During this period, we tried some repairing agents, but the effect has been not good. Recently, when the oil surface repairing agent was used, the situation finally turned, and the trial effect was very good, achieving the sealing effect. The specific repair method is as follows:
Repair steps:
1. Clean the groove and leak out the fresh surface. It can be cleaned with a small saw blade. 2. The two kinds of black and white repairing agents are adjusted according to the ratio of 1:1.
3. Apply the prepared repairing agent to the groove and apply it slightly higher.
5, quickly set the filter cloth, squeeze the filter plate together, make the repair agent and filter cloth stick together, while squeezing the groove
6. After squeezing for a period of time, the viscose is naturally formed and no longer changes. At this time, it can be used normally.
Second, the reasons for water seepage between the plates and frames cause water seepage between the plates:
1, hydraulic pressure is not high enough
2, filter cloth pleats and filter cloth with holes
3, the sealing surface has a block, the treatment method of water seepage between the plates is relatively simple, as long as the corresponding increase in hydraulic pressure, replacement of the filter cloth or the use of nylon to remove the block of the sealing surface can be
Third, the shape is not a filter cake or the filter cake is uneven
There are many reasons for the failure or unevenness of the filter cake. The supply is insufficient or too thin, or there is a blockage phenomenon. For these failures, it is necessary to carefully investigate the causes, and finally find the exact problem, and then solve the problem by symptomatic treatment. The main solutions are: increasing the feeding, adjusting the process, improving the feeding, cleaning the filter cloth or replacing the filter cloth, cleaning the blockage, cleaning the supply hole, cleaning the drain hole, cleaning or replacing the filter cloth, increasing the pressure or pump power, Low pressure start, continuous boosting, etc.
Fourth, the filter plate is slow or easy to lose.
Sometimes, due to oil stains and excessive stains on the guide bar, the filter plate will be slow to walk and even go off. At this time, it is necessary to clean the guide bar in time and apply butter to ensure its lubricity. One point to note is that it is strictly forbidden to apply thin oil on the guide rod, because the thin oil is easy to fall and the bottom is very slippery. The personnel can easily fall over during the operation and maintenance, causing personal injury accidents. (To be continued)
5. Failure of the hydraulic system.
The hydraulic system of the plate and frame filter press mainly provides pressure. When the oil chamber A increases the oil, the piston moves to the left, and the filter plate is pressed to seal it. When the oil chamber B is filled with oil, the piston moves to the right and the filter plate is released. Due to the precision of manufacturing, the hydraulic system has fewer failures, so just pay attention to routine maintenance. Despite this, due to the wear and tear, oil leakage-shaped seals appear every one year or so.
Common hydraulic faults are also unsuitable for pressure and hydraulic cylinder propulsion. The main reasons for the inability to maintain pressure are oil leakage, O-ring wear and improper operation of the solenoid valve. The usual treatment methods are to remove and inspect the valve, replace the O-ring, clean the check solenoid valve or replace the solenoid valve. The hydraulic cylinder is not suitable for propulsion. It is obvious that the air is sealed inside. At this time, as long as the system is pumping air, it can be quickly solved.
Six, other faults
1) Before using the filter press, check the number of frames, plates or diaphragms and the sequence in the machine; and move all the frames and plates to one end of the thrust plate to ensure that the filter plate does not go during the compaction process. Partial.
2) When the new filter cloth is replaced, there is a leakage due to the capillary hole. The solution is to adjust the feed pressure and use the return pipe to relieve the pressure. When the slurry is filled, the normal pressure can be restored. Or use a filter cake to apply the filter cloth sealing surface to reduce leakage;
3) For materials with fast dehydration, it can be fed by the stepwise feeding method to prevent the slurry from being sent to the head to be blocked: several filter chamber outlet valves at the end of the compression plate
Close, the other open, when waiting to be sent to the head, then gradually open the other valves, and gradually open all!
4) When the filter press beam is “elastically deformedâ€: the filter plate is arranged in the direction of the arc in the deformed beam, and can be “reset†after pressing; if conditions are met, the filter press is lifted from the single head, and the position is right. Yes; if plastic deformation occurs, it should be corrected by "external force" (jack, etc.)
Ai Intelligent Systems,Mobile Dvr Camera System,Vehicle Mdvr Recording System,Security Monitoring Systems
Vsstech Co.,Ltd. , https://www.vsstechcctv.com