Filtering and mixing integrated ultra-large type screen changing device

Abstract

A filtering and mixing integrated ultra-large type screen changing device is characterized by comprising an outer shell composed of an inlet plate, an outlet plate and filler strips clamped between the upper ends and the lower ends of the inlet plate and the outlet plate, a sliding plate type filtering unit penetrating through a sliding way composed of the outlet plate, the inlet plate, the upperfiller strip and the lower filler strip, and a power mechanism used for driving the sliding plate type filtering unit to reciprocate along the sliding way and connected to one side of the sliding plate type filtering unit through a connecting block. A material channel and an integrated porous plate are arranged on the sliding plate type filtering unit, and a filter screen piece is arranged on thefeeding side of the integrated porous plate; a petal type dynamic sealing disc and a sealing auxiliary spring are arranged between the matching surfaces of the inlet plate and the sliding plate type filtering unit, wherein the middle part of the petal type dynamic sealing disc is of a hollow structure, and a feeding port of the inlet plate and a mixing channel are of a honeycomb type structure; and a petal type static sealing disc with the middle part being of a hollow structure is arranged between the matching surfaces of the outlet plate and the sliding plate type filtering unit, and a discharging port of the inlet plate and the mixing channel are of a honeycomb structure.

Description

technical field [0001] The invention relates to a filter device used before granulation of synthetic resin (polymer) in the petrochemical industry or before modification and granulation of large plastics, in particular to a super-large special screen changing device with mixing function. Background technique [0002] The main function of the screen changing device is to filter impurities, and the second is to increase the back pressure before the pelletizing (granulating) head, which helps the devolatilizer to completely remove volatiles, so that the materials can be mixed or plasticized more uniformly, and the production The plastic particles are denser and the surface is brighter. Also in the petrochemical industry, polymer materials will produce impurities during the polymerization process or large-scale plastic modification and granulation, so the materials need to be filtered before granulation (granulation), and a screen changer is installed. [0003] The large-scale ...

AI Technical Summary

Problems solved by technology

[0005] 1. Because the output of this industry is very high, the stand-alone machine is more than ten tons per hour, the filter area of ​​the screen changer is large, and the integrated porous plate is easily deformed without the supporting mechanism.

[0006] 2. What the industry filters are polymer melts with high viscosity and poor fluidity. The sealing system of the screen changer is defective and easy to leak when the melting pressure is high.

[0007] 3. Due to the large flow rate and the resistance of the filter screen, the filter area and the diameter of the channel are also large, but the flow channel diameter of the melt pipe is small, and the difference in cross-sectional area between the two is 3-4 times, which will inevitably cause material in front of the screen The melt stagnates or stays, the material is easily degraded by overheating, and the color of the finished particles turns yellow and dark, which reduces the quality of the material

[0008] 4. Because of the large flow rate, the channel of the screen changing device is also large, and the temperature of the material in the core of the melt and the temperature of the outside are not uniform, which affects the flow of the material. Both the melt pipe and the screen changing device are heated on the outside, and the heat is conducted to Central location takes time

If the machine is shut down for inspection and restarted, the solidified bulk material needs to be preheated for a long time in advance. If the hard mass in the core is not melted and forced to be extruded, a big accident will occur.

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