Filter press installation and maintenance

Filter press installation and maintenance

First, the installation

The chamber filter press generally has two bearings at the head and the tail to withstand the weight of the entire machine. The tail end (the thrust plate end) is connected to the feed pipe, and the support end of the tail end is bolted to the foundation. The head end (the end of the pressing device) is far from the tail end, and the two beams are connected by two beams. The large automatic filter press has a beam length of about 11-14m and two support legs in the middle of each side beam. During operation, the beam is subjected to the pressure of the pressing device (horizontal direction) and the mud load during filtration (vertical direction); the pressing force transmitted by the hydraulic cylinder and the piston rod can cause the elastic elongation of the beam in the horizontal direction. This elongation of the large filter press can reach 3-5mm, so it should be ensured that the end of the pressing device can be freely stretched. Thus, in the installation of the filter press, the two support seats at the lower end of the compression end and the support legs of the two side beams are required to be floatingly mounted, and are not connected to the support base.

XMZ-300/1200-C filter press, although the compression end support is floating, but there are 3 pre-embedded retaining irons at the bottom of each support, and 2 side retaining irons, guiding, but before The retaining iron limits the elastic elongation of the beam and should be removed. In production, the beam of the filter press was deformed in the horizontal direction due to the restriction of the front retaining iron, and the supporting roller at the pressing end was separated from the beam.

Second, maintenance

1. Regular cleaning of the filter cloth

XMZ-300/1200-C (type filter press is equipped with PLC-controlled filter cloth automatic cleaning device, such as washing trolley, pneumatic nozzle, etc. The operation of automatic cleaning device depends on the accurate feedback of the signal of each control part, hydraulic valve Switching sensitive and reliable and constant pressure of compressed air source. In actual operation, with the deterioration of the function of each component, it is difficult to ensure the automatic cleaning of the filter cloth. The artificial chemical cleaning method is adopted to remove the filter cloth one by one. Soak for 0.5h in 5% **, then rinse, dehydrate and dry with industrial washing machine. Practice shows that when the oil content of the treated mud is high, the oil film bonded on the surface of the filter cloth can be carried out by chemical cleaning. Effective stripping to restore the filtration performance of the filter cloth.

The gap formed between the V-shaped grooves and the filter cloth uniformly distributed on both sides of the cast iron filter plate allows the water separated by the filter cloth to flow smoothly. As the running time increases, the fine particles penetrate the filter cloth, solidify on the surface of the filter plate, fill the V-shaped groove, increase the filtration resistance, and cause misjudgment of the performance of the filter cloth. Therefore, while replacing the filter cloth, pay attention to the cleaning of the V-shaped groove of the filter plate.

2. Cleaning and lubrication of the pulling plate mechanism and the transmission chain

During the unloading process, the filter cake often falls into the guide rail of the pull plate, which causes damage and deterioration of the lubrication condition of the pull plate mechanism and the drive chain. After the filter press has been operated for one year, the chain cover on both sides is opened to clean the accumulated mud. At the same time, the chain is removed and soaked with oil and kerosene is cleaned.

With the continuous operation of the filter press, the distance between the fingers of the pull plate mechanism and the lugs of the filter plate gradually increases, causing irregular plate or springboard phenomenon of the pull plate mechanism, and the pull plate mechanism should be replaced in time. Or partially pad the pull plate rails.

3. Regularly filter hydraulic oil

Every six months, the oil filter is filtered once by the oil filter to remove impurities and clean the hydraulic tank.

4. Troubleshooting

(1) Filter plate damage

The filter press of the van filter press is damaged as a common fault. If the number of filter plates is large, the following factors should be analyzed:

1 manufacturing quality of the filter plate;

2 Whether the selection of the material of the filter plate matches the lift of the feed pump;

3 In the diaphragm press method, the rubber quality of the diaphragm plate and the processing quality of the inner steel lining should be considered at the same time.

Under normal conditions, the pressure on both sides of the filter plate is in equilibrium. When the two sides of the filter plate are in different filtration stages, that is, one side is filtered and the other side is hydraulically squeezed, a pressure difference is formed on both sides of the filter plate, thereby damaging the filter plate. The reason:

1 During the unloading process, the amount of mud remaining on both sides of the filter plate is greatly different;

2 After the filter press starts to filter, the feed pump stops for a long time, and the filter cake in the semi-flow state of the filter chamber sinks to different degrees;

3 The filter hole of the filter plate is blocked.

(2) Spraying between filter plates

In the automatic filter press, the spraying phenomenon occurs between the filter plates. The reason is:

1 On the pressing surface of the filter board frame, the filter cloth is folded;

2 the filter cloth is damaged;

3The lateral beams of the two sides show different degrees of lateral bending (horizontal direction);

4 The thrust plate is not pressed or the pressing force of the hydraulic cylinder is too small.

The solution is to carefully clean the residual filter cake on the pressing surface of the filter plate (especially the lower part), or flush the filter plate in time to ensure the cleaning surface of the filter plate is clean; bundle the filter cloth to ensure its flatness. .