The difference between hydraulic oil press and screw press

Yishui Yangdong Machinery Co., Ltd. also produces hydraulic oil presses, screw oil presses, horizontal oil presses and various oil pressing equipment, including special oil presses for clay, automatic oil presses, and screw oil presses , Hydraulic oil press, flat-bottomed grits pot, high-speed grits grinder, press, hydraulic dehydrator, hydraulic rubber cutter, powder cake machine, centrifugal oil filter, automatic screw combination oil press, automatic hydraulic oil press Machine, peanut oil press, soybean oil press, rapeseed oil press, tea seed oil press, walnut oil press, flax oil press, linseed oil press, sesame oil press and other products are well received by users Praise. We can also design and produce various special hydraulic equipment according to customer needs.

1. Oil extraction method:

1. The hydraulic oil press is a kind of oil pressing equipment that squeezes the oil and squeezes out the oil according to the principle of hydrostatic pressure transmission, using liquid as the pressure transmission medium. It is a closed loop system composed of two parts: hydraulic system and oil press body, mainly composed of hydraulic pump station, control valve, electric motor, electrical cabinet, oil cylinder, barrel, frame and other parts.

2. The screw oil press is forced to feed the material through the screw shaft, and generates high temperature and high pressure under the rotation and extrusion between the ring and the press ring, so that the oil is crushed and squeezed to the oil and cake. , It mainly consists of frame, control cabinet, screw shaft, pressing ring, cake outlet and other parts.

3. Oil quality

The hydraulic pressing method is a purely physical oil pressing method. It does not generate temperature during the oil pressing process and does not destroy the organic components of the oil. The oil extracted is of good quality and low in impurities. It is especially suitable for some oils with high oil content. (Like sesame, almonds, pine nuts, peanuts, walnut kernels and some animal oils, etc.) and materials that must be processed by cold pressing methods (like chemical raw materials and pharmaceutical materials). The screw oil press produces high temperature due to mechanical friction during the oil pressing process, which will damage the organic components of the oil; during the rotating friction process, some oils with high oil content will produce sludge extruded from the pressing ring and the oil content. It will be a little bit more, because the squeezed oil has a higher temperature, the oil's nutrients are destroyed, and it needs to be cooled after squeezing.

4. Oil cake recovery and utilization:

The hydraulic oil press does not destroy the organic ingredients of the oil during the pressing process. The secondary value of the cake is high and the application range is wide. For example, some food processing companies make walnut powder, almond milk, and peanuts after a part of the oil can be reduced or processed. Reprocessed into other foods, etc., so that there are certain requirements on the oil output rate. The hydraulic oil press can adjust the different pressure to control the oil output rate, which is more suitable for these enterprises; this is not possible on the screw oil press Yes, the screw oil press generates high temperature due to mechanical friction during the oil pressing process, and the water in the oil will be lost during the oil pressing process, which will also cause certain losses to the direct sale of oil cakes (pressing the water content of the cake with hydraulic pressure) The content is about 10%, and the water content of the oil cake of the screw press is only 2-3%).

5. Equipped with power

The supporting power of medium and small hydraulic oil press is generally 1.5-3KW, and the power of a smallest screw oil press is also above 5KW!

6. Failure rate and price of wearing parts

The hydraulic oil press works by oil pumps and some control valves. The faults are mainly manifested in the sealing of the pipeline and plunger. It can be solved by replacing some gaskets during maintenance. It is easy to repair and the parts are cheap. The screw oil press works by mechanical rotation, which produces a lot of friction during the oil pressing process. The wear between the screw shaft and the press ring is quite fast. If the workload is large, it usually needs to be replaced every six months, which is troublesome to disassemble and the price of accessories is high. ; The hydraulic oil press adopts a vertical structure and a button-type centralized control, which has a small footprint and is easy to operate; a small hydraulic oil press can also be replaced with a 220V power supply, which is extremely convenient for users!