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NEWS
Working Principle Of Screw Press
Time:Mon-11-21 hits:
1. The working principle of the screw press
The general process of extracting oil can be summarized as the propelling effect of the rotating screw shaft in the press chamber, which reduces the volume of the press chamber and produces continuous squeezing effect on the material.
The basic process of squeezing oil is generally divided into three stages: the feed pre-compression (low pressure) section, the main pressing (high pressure oil output) section, and the cake draining (stabilization) section.
2. The formation of press chamber pressure includes:
(1) The reduction of the empty volume of the press chamber forces the press material to be compressed to form pressure.
(2) Reduce the gap of the cake ring and increase the reaction force to the squeezing material.
3. Oil characteristics of screw press mechanism
It is a continuous oil squeezing equipment that uses a screw shaft to rotate and propel the billet in the squeezing cage while extruding into a cake and extruding grease.
Its characteristics are: continuous production, large processing capacity of a single machine, adaptability to a variety of oils, dynamic squeezing, friction heating, short squeezing time, high oil yield, thin cakes and easy crushing, and low operating intensity.
Disadvantages: relatively large energy consumption, many consumable parts, high maintenance requirements for mechanical failures, and greater thermal impact of oil cakes.
4. Distribution of press chamber pressure
(1) Vacant volume V Approximately the volume of the space contained between the outer surface of each lead of the screw shaft and the inner surface of the cage is called the "vacant volume" of the lead (single-threaded thread pitch). Calculated.
(2) The compression ratio is also known as the "vacant volume ratio". There is the ratio of the vacant volume corresponding to the two adjacent leads of the screw shaft, that is, E1-2=V1/V2; the total compression ratio E is also known as the "oil press or press Compression ratio of the chamber” is the ratio of the empty volume of one lead at the feed end of the system to the empty volume corresponding to a lead at the cake output end, namely E=Vj/Vch. Its value is required to be greater than the actual compression ratio En of the squeezed material, and it should be the same for every lead.
The above is the working principle of the screw press.
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