Analysis of 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.

        Oil press refers to a machine that squeezes grease out of oil with the help of external mechanical force. It can be divided into household oil presses, hydraulic oil presses, screw oil presses, new hydraulic oil presses, and high-efficiency oil presses. Oil pressing equipment mainly includes hydraulic oil press (also known as hydraulic press) and screw oil press. The hydraulic oil press is suitable for pressing small batches, and needs to retain the original flavor oils, such as sesame oil, olive oil, walnut oil, etc.; the screw oil press has a large production capacity and a high oil yield, and is a common and common oil press equipment . At present, there are many names for oil presses on the market, such as fully automatic oil presses, multi-function oil presses, vacuum oil presses, new oil presses, and integrated filter presses, etc., all of which are actually screw presses. Oil machine.

Squeeze

        There are two process methods for extracting edible oil from plants: chemical extraction method and physical extraction method, which is what we usually call extraction method (chemical) and pressing method (physical):

        Squeezing method: The squeezing method has a long history, and its process is relatively simple: After the oil is steamed and fried, the oil is squeezed out of the oil by a mechanical method. The ancient squeeze method requires heavy manual labor from the operator. In the extruded oil residue (oil cake), the residual oil content is quite high, thus wasting extremely valuable oil resources. The modern squeezing method is already an industrialized automated operation, but the problem of high residual oil content in the oil residue still cannot be solved.

　　 There are cold pressing and hot pressing from the pretreatment of the pressed raw materials, also called cooked pressing. Cold pressing means that the raw materials are directly put into the oil press to squeeze out the oil without being roasted or steamed. This method is relatively lighter in color and brighter in color, but the oil yield is low, and the oil tastes not strong and mellow. . The cooked squeezer must dry the oil crops before squeezing. The purpose is to reduce the moisture of the raw materials, increase the activity and fluidity of the oil molecules, thereby increasing the oil yield and ensuring the aroma of the oil. But it also destroys the chemical composition of the oil, causing the oil to be darker and darker.

The basic process of the oil pressing process is as follows:

1. Conventional production process: raw meal-steaming and frying-pressing-machine squeezing crude oil

2. Special oil production process: oilseed-fried seed-squeezed-filtered-flavored oil

3. Special oil production process: oilseed-whole seed cold pressing-filtering-cold pressing oil

        The process of oil being squeezed out of the oil: When the oil enters the press chamber, the pressure increases as the press chamber rotates. The seed material is continuously squeezed as the oil is squeezed out, and the pressure between the directly contacting squeezed material particles causes the plastic deformation of the seed material, especially where the oil film ruptures and is integrated. In this way, after being squeezed out of the blast chamber, the squeezed material is no longer loose, but forms a plastic body called oil cake. Due to the dual effects of temperature and pressure during squeezing, protein will continue to deteriorate, which will affect the plasticity of the squeezed material. In short, the proper degree of protein denaturation can ensure the best squeezing effect.

Principle process

3.1 Principle

(1) Peanut is a kind of crop with high oil content. Its internal oil exists in the cell in spherical or granular form and is surrounded by a layer of closed film. In the process of being squeezed by the outside, this layer of film and cell wall When they burst together, the peanut oil will flow out from the cracks; during the extrusion process, the oil in the peanuts is partially squeezed out, and the peanuts become brittle and hard, losing their original elasticity; and the peanut red coat contains more fiber, which is under pressure. Then, it is separated from the surface of the peanut, so that the peanut red coat is easy to fall off; in the extrusion process, the peanut is subjected to pressure instead of shearing force, so there is no phenomenon of broken kernels, and it is easy to restore the original shape;

(2) Different pressures are applied according to the requirements of fat content. Different defatted peanuts can be obtained.

3.2 Process

Process requirements: The peanut degreasing rate is more than 50%; the peanuts are intact without broken pieces, there is no adhesion between the peanuts, and the peanuts are easy to fall off. The important factor influencing the degreasing effect is moisture, and the secondary factor is time. The best condition for achieving the degreasing effect is 4.52%-7.26%. (Excessive moisture will affect the oil yield, and excessive moisture will easily cause the Huasheng breakage rate to be too high.

Peanut oil

Peanut kernels, temperature-controlled drying, raw material wrapping, pressurized

Defatted peanut kernels

4 Conclusion

Peanuts can be squeezed with a hydraulic oil press under effective conditions such as pressure, moisture, temperature and time to obtain apricot color, original flavor, fragrant smell, pure peanut oil and different degreasing effects Peanuts

advantage

No chemical additives are added during the production process using this equipment.

Simple operation, concise and convenient

High oil yield and low crushing cost

Pure oil, rich in nutrition

Optional raw materials, safe and secure

New peanut oil extraction and kernel oil press

        A new type of peanut oil and kernel oil press appears on the market. This oil press has successfully made up for the defect that peanut meal cannot be reused after high-temperature pressing of peanut oil. When peanut oil is extracted, peanuts will not be pressed into meal. It is successfully retained as whole defatted peanut kernels, which will spoil the shape, taste and natural nutrients of peanuts. The machine covers an area of 10 square meters and is purely pressed. No chemical materials are added during the pressing process, and it has a long service life. Advantages: The oil produced has a stronger fragrance than ordinary oil presses, and does not foam during consumption, which is widely welcomed by consumers.

2.1. Product analysis:

①Characteristics of the new hydraulic oil press: It adopts the combination of physics and modern technology and has been successfully developed after many years of experiments. Compared with ordinary oil presses, this new type of hydraulic oil press is environmentally friendly and energy-saving, with high product added value, no loss, and physical pressing. It does not add any chemical raw materials, no environmental pollution, no waste water, waste gas, and waste generation. It is an alternative to the traditional oil press. It is a new type of environmentally friendly food processing equipment.

②Innovative function of Yuantong hydraulic oil press process: successfully made up for the defect that peanut meal cannot be reused after high temperature pressing of peanut oil, and successfully designed a kind of peanuts that will not be pressed into meal when peanut oil is pressed and produced , But was successfully retained as whole defatted peanut kernels and its technology;

③ Separate the peanut red coat and peanut kernels while extracting the original peanut oil, without destroying the shape, taste and natural nutrients of peanuts, which is in line with the deep processing of various foods. Peanut kernels can be sold directly; they can also be restored to their original state and processed into high-protein, low-fat green foods, such as spicy peanuts, spiced peanuts, fish skin peanuts, Japanese beans, peanut butter and other peanut series foods.

       Peanuts, as one of the favorite traditional foods of the common people, have been known as the "longevity fruit" since ancient times. The folk proverb says: "Eating peanuts often can keep good health." Studies have found that it has certain medicinal value and health care functions.

Maintenance

       The lubrication should be checked after every 50 hours of work. The oil cup above the reduction box must not be short of oil. The inner bearing of the Yuantong screw shaft adjustment screw should be drawn from the adjustment screw hole and filled with butter. Dry grinding is strictly prohibited.

       All lubrication parts should prevent the intrusion of dust and other impurities. The oil quality of the gearbox should be checked once a year. If any deterioration is found, all the oil should be replaced.

       When the squeezing capacity decreases and the cake or oil output is abnormal, the squeezing screw shaft should be pulled out, and the wear of the squeezing screw, squeezing strip, cake head and cake outlet should be checked, and the worn parts should be replaced in time.

       After each work, the residual cake in the machine should be removed, and the dust and grease on the surface of the machine should be wiped.

       When storing for a long time after the end of the production season, a maintenance should be carried out, and the snails, squeezed strips, and cake heads should be removed, washed, reloaded and oiled, and placed in a dry place.

       After each oil squeezing, the screw shaft should be removed to clean the residue, and at the same time, use a dry cloth and cotton swab to scrub the rotating port to prevent blockage.