A Repairing Method for Filling Cylinder of Rotary Drum Vacuum Filter

Abstract

The invention discloses a method for repairing a packing barrel of a drum type vacuum filter. The method for repairing the packing barrel of the drum type vacuum filter comprises the following steps of 1, conducting rough turning on a shaft neck at the driving end of the packing barrel, an oil seal shaft neck, packing seal shaft necks, a filter groove outer circle and bearing shaft neck damaged parts; 2, milling and cleaning R-angle connecting weld seams of the filter tank partition plates by using a forming milling cutter or manually grinding and cleaning the R-angle connecting weld seams ofthe filter tank partition plate by using a hard alloy rotary file electric grinding and angle grinding machine; 3, carrying out build-up welding to R-angles of the filter tank; 4, repairing and polishing R-angle weld seams of the filter tank to complete the repairing of R-angle weld seams of the filter tank of the packing barrel; 5, conducting laser cladding complex machining on the packing barrel, wherein the cladding is carried out in the shaft neck at the driving end, the oil seal shaft neck, the packing seal shaft necks at the driving end, the packing seal shaft necks at the non-driving end and the filter groove outer circle sequentially; 6, conducting rough turning to laser cladding parts; and 7, carrying out fine grinding on the rough turning parts. According to the method for repairing the packing barrel of the drum type vacuum filter, a surface of a wear packing barrel can be repaired, so that the wear packing barrel can be reused and the use cost is reduced.

Description

technical field [0001] The invention relates to the technical field of drum-type vacuum filters, in particular to a method for repairing a filling cylinder of a drum-type vacuum filter. Background technique [0002] The shell of the rotary drum vacuum filter is provided with a drum packing cylinder. The outer circular surface of the drum packing cylinder is divided into several fan-shaped filter chambers spaced apart. The bottom of each filter chamber is provided with a guide tube communicating with the distribution valve. Every time the drum packing cylinder rotates once, each filter chamber is connected to the vacuum system and compressed air system in turn through the distribution valve, and the operations of filtering, slag washing, drying, slag unloading and filter cloth cleaning are completed in sequence. The characteristic of the drum vacuum filter is that the drum packing cylinder completes a cycle every time the drum packing cylinder rotates, so as to realize solid-...

AI Technical Summary

Problems solved by technology

[0003] During the operation and use of the rotary drum vacuum filter, if figure 1 As shown, due to the relative motion contact between the filter block and the outer surface of the packing cylinder, the journal A at the driving end of the packing cylinder, the oil seal journal B, the packing seal journal (D, E), and the outer circle G of the filter tank are covered with slurry particles Wear and tear, resulting in the increasing gap value with the drum vacuum filter shell, the surface material of the packing cylinder is corroded by the process medium, resulting in cracks at the welding seam of the R angle connection of the filter tank separator, and the shaft journal of the bearing position (C, F) Due to heavy load wear and other reasons, the drum vacuum filter is invalidated and scrapped due to wear and corrosion.

[0004] The material of the packing cylinder is mainly stainless steel, and the linear expansion coefficient of stainless steel is 40% larger than that of carbon steel, and the value of the linear expansion coefficient increases correspondingly with the increase of temperature, while the thermal conductivity is only one-third of that of carbon steel. One, if the filler cylinder is repaired by surface cladding and welding with a large area, the risk of deformation is high, and it may not meet the use requirements after repair

Therefore, when the service life of the packing cylinder is coming to an end or if there is an operation accident and the damage is large, it should be replaced directly. However, since the packing cylinder is made of stainless steel as a whole, the volume is large and the material value is high

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