The speed of the screw oil press shall not be corrected at will !
The speed of the screw oil press shall not be corrected at will, otherwise it will affect the oil yield of the oil press. The general speed should be about 33d/min.
The technological conditions and the structure of the oil press are different, so the reasonable pressing time required is also different. Therefore, measuring or determining the time for the press to pass through the press chamber, The relation between pressing time and the actual compression ratio :Vz"t nT=(minutes)(4-8) Vm type :T- the average residence time of the press chamber (minutes):Vm- the total free volume of the press chamber (cm 3):Vz a measured or calculated press volume per minute (cm 3/ min),￡n- the actual compression ratio of the press.
There is a certain relationship between the pressing time and the oil production efficiency. It is generally believed that the pressing time is long and the oil flow is diffuse, but the pressing time can not be too long, otherwise the heat loss is more, but it will affect the oil efficiency and production capacity. Therefore, under the premise of satisfying the oil production efficiency, the pressing time should be shortened as much as possible. The residence time of the embryo in the press chamber mainly depends on the rotational speed of the spiral shaft, followed by the old and new degree of the pressing ring and the thickness of the cake. For some oil with high oil content, the pressing time can be extended appropriately, and the right speed should be selected. The screw oil press belongs to high-speed pancakes. The so-called high-speed means that the spindle speed is fast and the material embryo stays in the press chamber for a short time (generally only tens of seconds); The so-called pancake is 1.5 ~ 3 mm thick, so the press screw and ring wear quickly. According to the use experience, usually every processing 40 ~ 50 tons of rapeseed need to check, replace part of the wearing parts (especially pressing screw and adjusting cake head).
Because of the short pressing time of the screw oil press, it is good for some oils (such as cold-pressed soybeans, protein retention, etc.), but the further reduction of dry cake residual oil rate of other oils is limited to a certain extent. For different oils, there should be corresponding spindle speed.
