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In the realm of grain and oil processing, soybean oil presses play a pivotal role. As a key piece of equipment, it directly impacts the oil extraction rate and the quality of the final product. Whether you're running a small - to - medium - sized oil mill or an agricultural cooperative, understanding the operation process and maintenance essentials of high - efficiency soybean oil presses for export is crucial for achieving stable high - yield production and energy conservation.
There are mainly two types of soybean oil presses: screw oil presses and hydraulic oil presses. Screw oil presses are known for their continuous operation, high automation, and relatively high oil extraction efficiency. They are suitable for large - scale oil production lines, with an average daily processing capacity of 5 - 20 tons. For example, in large - scale oil mills in the United States, screw oil presses are widely used to meet high - volume production needs.
Hydraulic oil presses, on the other hand, are characterized by their gentle pressing process, which can better preserve the nutrients in the oil. They are more suitable for small - scale production and the production of high - end oils. Their daily processing capacity is generally around 1 - 5 tons. In some European specialty oil production workshops, hydraulic oil presses are favored for producing high - quality olive oil and soybean oil.
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The first step is to clean the soybeans. Impurities such as stones, dust, and broken beans can affect the oil extraction process and the quality of the oil. Using a vibrating screen or a magnetic separator can effectively remove these impurities, ensuring that the purity of the raw materials reaches over 98%.
After cleaning, the soybeans are fed into the oil press. The feeding speed should be uniform to ensure stable operation of the oil press. Generally, for a screw oil press with a processing capacity of 10 tons per day, the feeding speed is controlled at about 400 - 500 kg per hour.
This is the core step. For screw oil presses, the pressing temperature is usually controlled at 110 - 130°C, and the pressure can reach 30 - 50 MPa. For hydraulic oil presses, the pressing temperature is relatively lower, around 60 - 80°C, and the pressure is about 20 - 30 MPa. Different pressing methods (cold - pressing and hot - pressing) also have an impact on the oil quality. Cold - pressed oil has a lighter color and more nutrients, while hot - pressed oil has a higher oil extraction rate.
The crude oil obtained from pressing contains some impurities, such as bean dregs and fine particles. Using a plate - and - frame filter or a centrifugal filter can effectively remove these impurities, improving the clarity of the oil. The filtration accuracy can reach 0.1 - 0.5 microns.
After pressing, the remaining bean cake still contains a certain amount of oil and high - quality protein. The protein content in the bean cake can reach 40 - 50%, which can be used as high - quality feed or for further deep processing.
The moisture content of the raw materials is a crucial factor. The moisture content of soybeans should be controlled at about 10 - 12%. Too high moisture content will lead to low oil extraction efficiency, while too low moisture content will damage the oil press. In addition, the pressing pressure, temperature, and time also need to be strictly controlled according to the type of oil press and the characteristics of the raw materials.
Before starting the machine, check the lubrication of each part, the tightness of the belts, and the power supply. During operation, pay attention to the temperature and pressure changes of the oil press. After operation, clean the oil press in time to prevent the accumulation of bean dregs and oil stains. Regularly replace the wearing parts, such as the screw shaft, to ensure the normal operation of the oil press.
A small - scale oil mill in Brazil optimized its operation process according to the above methods. By strictly controlling the moisture content of the raw materials and the pressing parameters, the oil extraction rate increased from 15% to 20%, an increase of 5 percentage points, significantly improving the economic benefits of the enterprise.
| Question | Answer |
|---|---|
| Why is the residual oil rate too high? | It may be due to improper control of the pressing parameters, such as low temperature, insufficient pressure, or high moisture content of the raw materials. |
| Why is the oil quality turbid? | This may be caused by insufficient filtration or the presence of impurities in the raw materials. It is necessary to strengthen the cleaning and filtration processes. |
If you want to learn more technical details about high - efficiency soybean oil presses for export, such as the latest technological improvements and more in - depth operation guides, click here to explore further.
