Low-temperature oil pressing equipment

Abstract

The utility model provides low-temperature oil pressing equipment which comprises a machine frame used for supporting, a pressing cage, a spiral assembly and a heater, wherein the spiral assembly and the heater are arranged in the pressing cage. A hollow main shaft is arranged at the axis of the spiral assembly and is connected with a motor and a speed reducer; and the heater is connected with a control system. According to the low-temperature oil pressing equipment, the temperature control system is matched with the heater, so that the pressing temperature can be controlled when the low-temperature oil pressing equipment is used, and low-temperature pressing is ensured; the spiral assembly is arranged to increase the length of a feeding area, the conveying capacity is improved, oil can smoothly enter the pressing cage, spirals and conical rings are alternately connected to form a multi-stage pressing mode, and the oil outlet amount is increased. The plasticity of the peanut kernels is gradually enhanced and cell structures are destroyed through steaming, frying and tempering, so that grease components are promoted to be released from damaged cells, and the grease extraction rate and the resource utilization rate are increased.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the extrusion mechanical equipment field, and specifically relates to an oil pressing equipment. BACKGROUND

[0002] Low-temperature oil pressing refers to the operation of pressing oil-containing materials between room temperature and 65 DEG C. The low-temperature oil pressing method belongs to a physical method, and the oil is pressed without being heated, so that the oil nutrition is not affected. The low-temperature pressing equipment generally uses a rotating spiral shaft to push the materials in the pressing chamber, so that the materials are continuously pushed forward, and the oil is pressed out of the pressing cage through the gaps after the materials are extruded. At the same time, the materials are pressed into cake blocks and discharged from the end of the pressing chamber.

[0003] Peanuts, also known as long-life fruits, are widely planted in China and are an important oil crop and plant protein resource. The content of unsaturated fatty acids in peanut oil is about 80%, mainly composed of oleic acid and linoleic acid, which has the effects of reducing high blood lipids, preventing cardiovascular diseases, regulating human physiological functions, etc. In addition, peanut oil is rich in plant sterols, vitamin E and resveratrol and other nutrients. Studies have shown that the low-temperature extracted oil has high retention of unsaturated fatty acids and nutrients, high antioxidant capacity, and also reduces the denaturation of protein and the gelatinization of starch in the cake, which makes the nutritional value higher than that of high-temperature pressed peanut oil.

[0004] In the low-temperature pressing method of peanuts, the spiral pressing method has flexible process and simple equipment, and can be widely applied to small-batch oil processing in small factories. The crude oil obtained has good quality and good taste, no solvent residue, is a green food, and is deeply loved by consumers. However, the extraction rate of the mechanical pressing method is not high, and the oil waste rate is high.

[0005] Different pressed materials have different size requirements for the pressing equipment; and the pressing equipment with higher automation is required in industrial production. UTILITY MODEL CONTENT

[0006] In view of the deficiencies in the prior art, the utility model aims to provide a low-temperature oil pressing equipment, which can flexibly adjust the process of the spiral pressing method, so that the oil extraction rate is higher, and the resource utilization rate is improved.

[0007] The technical scheme for realizing the above-mentioned purpose of the utility model is as follows:

[0008] A low-temperature oil pressing equipment, comprising a rack for support, a pressing cage and a spiral assembly and a heater arranged in the pressing cage are installed on the rack; a hollow main shaft is arranged at the center of the spiral assembly, the heater is a cylindrical electric heater, which passes through the center of the hollow main shaft, and the hollow main shaft is connected with a motor and a speed reducer; the heater is connected with a control system;

[0009] The motor, the speed reducer and the control system are arranged on one side of the frame; and the bottom of the frame is provided with an oil collecting disc.

[0010] The improved technical scheme of the utility model is that the top of the extraction chamber is provided with a feeding port, and the feeding port is connected with a conditioning device for humidity conditioning.

[0011] The inner wall of the extraction chamber and the screw assembly are filled with extraction strips; the screw rotates with the main shaft, peanut kernels are fed into the extraction chamber through the feeding port, the peanut kernels are forwardly pressed, and oil is discharged through the gaps between the extraction strips and collected by the oil collecting disc.

[0012] Further, the screw assembly comprises multi-stage screw elements and taper ring elements, and the screw assembly is connected with the hollow main shaft through a key.

[0013] The screw assembly is composed of five-stage screws, three-stage taper rings and one-stage smooth sleeve, the screw assembly is sequentially arranged along the conveying direction of the material as a feeding area, a main pressing area and a cake discharging area, the first-stage and second-stage screws belong to the feeding area, the third-stage and fourth-stage screws belong to the main pressing area, and the fifth-stage screw belongs to the cake discharging area; the screws and the taper rings are alternately connected, and the smooth sleeve is located at the discharging end of the screw assembly.

[0014] Further, the taper rings are arranged between the second-stage and third-stage screws, between the third-stage and fourth-stage screws and between the fourth-stage and fifth-stage screws, the taper ring is a taper ring with gradually increasing outer diameter, and the end with large outer diameter is close to the discharging end; the outer surface of the taper ring is provided with anti-skid protrusions.

[0015] The anti-skid protrusions are arranged on the outer surface of the taper ring to prevent the oil from slipping and rotating with the shaft, the taper ring connects the two screws, the pressure is quickly built, and the conveying capacity of the oil is not affected.

[0016] The feeding area is used for conveying the oil forwardly and initially pressing; the main pressing area is used for forming high pressure and discharging a large amount of oil; and the cake discharging area is mainly used for draining the oil and keeping the pressure stable to change the oil into cake meal; the screw assembly of the utility model is composed of five-stage screws, three-stage taper rings and one-stage smooth sleeve, the feeding area is composed of two-stage screws, the length of the feeding area is lengthened, the conveying capacity is improved, the peanuts are conveyed along the forward direction of the screw smoothly, the peanuts are pressed multiple times by the alternately connected screws and taper rings in the main pressing area after the peanuts are quickly built pressure by the taper ring, the cake meal is discharged from the smooth sleeve to flow into the oil collecting disc; the screws and the taper rings are alternately connected to form a multi-stage pressing mode, and the oil yield is improved.

[0017] The smooth sleeve is a smooth cylindrical sleeve, the smooth sleeve is sleeved with the cake discharging ring, the discharging end of the smooth sleeve is connected with the cake breaking ring, and the cake breaking ring is fixed by the fixing device, so that the screw assembly is tightly connected.

[0018] The cake breaking ring abuts against the fixing device to ensure that the screw assembly is tightly connected.

[0019] The screw assembly is sequentially provided with a feeding area, a main pressing area and a cake discharging area along the conveying direction of the material, the length of the feeding area is 40-50% of the total length, the length of the main pressing area is 40-50% of the total length, and the rest is the length of the cake discharging area.

[0020] The feeding area is used for feeding and primary pressing of the oil material; the main pressing area is used for forming high pressure and discharging a large amount of oil; and the cake discharging area is mainly used for draining the oil and keeping the pressure stable so that the oil material becomes cake meal. More preferably, the length of the feeding area is 0.42L, the length of the main pressing area is 0.43L, and the length of the cake discharging area is 0.15L (0.42L represents that the length of the feeding area is 0.42 of the total length).

[0021] The screw elements are all left-handed.

[0022] The oil pressing method of the low-temperature pressed peanut oil is provided below, which comprises the following specific steps:

[0023] Impurity removal: the shelled peanuts are screened through a vibrating screen to remove impurities such as soil, stones and gravel.

[0024] Steaming and frying: the screened peanut kernels are fried, the frying temperature is controlled at 60-80°C, and the frying time is 15-20 min, so as to destroy the cell structure of the oil material and open the oil discharge channel;

[0025] Quality adjustment: the peanut kernels are sent into a quality adjustment equipment, a certain amount of water is sprayed at 60°C, and the material is maintained for a period of time so that the final moisture content of the material is between 6%-7%, so that the oil material can fully absorb water, the internal structure becomes loose, the plasticity gradually increases, and the oil material is easy to be pressed.

[0026] Low-temperature pressing: the quality-adjusted peanut kernels are put into a screw oil press to be pressed, the pressing temperature is controlled at about 65°C, and low-temperature pressed oil and cake meal are obtained.

[0027] The low-temperature oil pressing equipment has the following beneficial effects:

[0028] The low-temperature oil pressing equipment has the following beneficial effects: BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 FIG. 1 is a structural schematic diagram of the low-temperature oil pressing equipment;

[0030] Figure 2 Structure diagram of the pressing mechanism of the low-temperature oil pressing equipment;

[0031] Figure 3 Structure diagram of the spiral assembly;

[0032] Figure 4 Structure diagram of the cone ring;

[0033] The signs in the drawings are as follows:

[0034] 1, frame; 2, cage; 3, oil collection tray; 4, press bar; 5, motor; 6, speed reducer; 7, heating start button; 8, heating stop button; 9, control system; 10, main motor start button; 11, main motor stop button; 12, feed inlet; 13, spiral assembly; 131, 1# spiral; 132, 2# spiral; 133, 3# spiral; 134, 4# spiral; 135, 5# spiral; 136, 1# cone ring; 137, 2# cone ring; 138, 3# cone ring; 139, light sleeve; 14, broken cake ring; 141, hollow main shaft; 15, fixing device; 16, heater. DETAILED DESCRIPTION

[0035] The following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0036] To make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described in more detail below in combination with the drawings of the present application. In the drawings, the same or similar signs represent the same or similar elements or elements with the same or similar functions throughout. The described embodiments are part of the present application, not all of the embodiments.

[0037] In the description of the present application, it should be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application.

[0038] Unless otherwise specified, the means used in the examples are all existing technical means in the art.

[0039] Example 1

[0040] Reference Figure 1The embodiment provides a low-temperature oil pressing equipment, which comprises a rack 1 for supporting, a pressing cage 2 and a spiral assembly 13 and a heater 16 arranged in the pressing cage are arranged on the rack 1, the heater is a cylindrical electric heater, a hollow main shaft 141 is arranged at the axis of the spiral assembly (see Figure 3 ) The hollow main shaft 141 is connected with a motor 5 and a speed reducer 6; the heater is connected with a control system 9.

[0041] The motor 5, the speed reducer 6 and the control system 9 are arranged on one side of the rack; an oil collecting disc 3 is arranged at the bottom of the rack 1. The pressing cage 2 is provided with a feeding port 12 at the top. The pressing cage is filled with pressing bars 4 between the inner wall and the spiral assembly; the peanut kernels are fed into the pressing cage 2 through the feeding port under the rotation of the spiral and the main shaft, the peanut kernels are pressed forward, and the oil is discharged through the gap of the pressing bars 4 and collected by the oil collecting disc 3,

[0042] In the embodiment, the spiral assembly 13 comprises multi-stage spiral elements and taper ring elements, and the spiral assembly is connected with the hollow main shaft 141 through a key.

[0043] Referring to Figure 2 and Figure 3 , the spiral assembly is composed of five-stage spirals, three-stage taper rings and one-stage smooth sleeve, the spiral assembly is sequentially arranged along the conveying direction of the material and comprises a feeding area, a main pressing area and a cake discharging area, 1# spiral 131 and 2# spiral 132 belong to the feeding area, 3# spiral 133 and 4# spiral 134 belong to the feeding area, and 5# spiral 135 belongs to the cake discharging area; the spirals and the taper rings are alternately connected, and the smooth sleeve is located at the discharging end of the spiral assembly. Specifically, taper rings are arranged between 2# spiral 132 and 3# spiral 133, between 3# spiral 133 and 4# spiral 134 and between 4# spiral 134 and 5# spiral 135, and the taper rings are sequentially arranged as 1# taper ring 136, 2# taper ring 137 and 3# taper ring 138. Figure 4 A sectional view of the 1# taper ring 136 is shown, the taper ring is a taper ring with gradually increasing outer diameter, and the end with the large outer diameter is close to the discharging end; the taper ring is provided with anti-skid protrusions on the outer surface.

[0044] In the embodiment, the length L1 of the feeding area is 0.42L, the length of the main pressing area is 0.43L and the length of the cake discharging area is 0.15L.

[0045] The smooth sleeve is a smooth cylindrical sleeve, and the smooth sleeve is provided with a cake discharging ring; the discharging end of the smooth sleeve is connected with a cake breaking ring 14, the cake breaking ring is fixed through a fixing device 15, the cake breaking ring abuts against the fixing device 15, and the spiral assembly is tightly connected.

[0046] A heating starting button 7, a heating stopping button 8, a main motor starting button 10 and a main motor stopping button 11 are arranged on the operation panel of the temperature control system 9.

[0047] The device of the embodiment is used for low-temperature pressing operation of peanuts, and process condition one is as follows:

[0048] After the peanuts are cleaned, the peanuts are directly put into the pressing device at room temperature for pressing.

[0049] Embodiment 2

[0050] In the embodiment, the top of the cage 2 is provided with a feeding port 12, and the feeding port 12 is connected with a conditioning device for humidity adjustment.

[0051] The other settings are the same as those in Embodiment 1.

[0052] The device of the embodiment is used for low-temperature pressing operation, and process condition of the embodiment is as follows:

[0053] Process condition two: after the peanuts are cleaned, the roasting temperature is controlled at 60-80℃, the peanuts are roasted for 15-20 min, the peanut kernels are sent into the conditioning device, a certain amount of water is sprayed at 60℃, the material is maintained for a period of time so that the final moisture content of the material is less than 6%, and the peanuts are put into the pressing device at room temperature for pressing.

[0054] Process condition three: after the peanuts are cleaned, the roasting temperature is controlled at 60-80℃, the peanuts are roasted for 15-20 min, the peanut kernels are sent into the conditioning device, a certain amount of water is sprayed at 60℃, the material is maintained for a period of time so that the final moisture content of the material is between 6% and 7%, and the temperature of the oil pressing device is controlled at about 65℃ for pressing.

[0055] The Soxhlet extraction method is used to detect the residual oil in the cake, and the detection results are shown in the following table:

[0056] Process conditions One Two Three Residual oil rate (%) 27.62％ 17.70％ 10.02％

[0057] Although the above describes the utility model through embodiments, those skilled in the art should understand that, on the premise of not deviating from the spirit and essence of the utility model, the improvements and modifications of the utility model should all belong to the protection scope of the utility model.

Claims

1. A low temperature oil pressing apparatus, characterized in that, The machine frame is provided with a pressing cage, a screw assembly and a heater arranged in the pressing cage, a hollow spindle is arranged at the center of the screw assembly, the heater is a cylindrical electric heater, the hollow spindle is connected with a motor and a speed reducer, and the heater is connected with a control system. The motor, the speed reducer and the control system are arranged on one side of the machine frame, and an oil collecting disc is arranged at the bottom of the machine frame.

2. The low-temperature oil expression apparatus of claim 1, wherein, A feeding port is arranged at the top of the pressing cage, and a conditioning device for adjusting humidity is connected with the feeding port.

3. The low-temperature oil expression apparatus of claim 1, wherein, The screw assembly comprises multiple screw elements and cone elements, and is connected with the hollow spindle through a key.

4. The low-temperature oil expression apparatus of claim 3, wherein, The screw assembly is composed of five screw sections, three cone sections and one smooth sleeve section, the screw assembly is sequentially arranged along the conveying direction of the material as a feeding area, a main pressing area and a cake discharging area, the first and second screw sections belong to the feeding area, the third and fourth screw sections belong to the main pressing area, and the fifth screw section belongs to the cake discharging area, the screw sections and the cone sections are alternately connected, and the smooth sleeve section is arranged at the cake discharging end of the screw assembly.

5. The low-temperature oil expression apparatus of claim 4, wherein, The cone sections are arranged between the second and third screw sections, between the third and fourth screw sections and between the fourth and fifth screw sections, the cone sections are tapered rings with gradually increasing outer diameters, and the end with the large outer diameter is close to the cake discharging end, and the outer surface of the cone sections is provided with anti-skid protrusions.

6. The low-temperature oil expression apparatus of claim 4, wherein, The smooth sleeve section is a smooth cylindrical sleeve, and the outer sleeve is a cake discharging ring, the cake discharging end of the smooth sleeve section is connected with a cake crushing ring, and the cake crushing ring is fixed through a fixing device.

7. The low-temperature oil expression apparatus according to any one of claims 1 to 6, characterized in that The screw assembly is sequentially arranged along the conveying direction of the material as a feeding area, a main pressing area and a cake discharging area, the length of the feeding area is 40-50% of the total length, the length of the main pressing area is 40-50% of the total length, and the length of the cake discharging area is the remaining length.

8. The low-temperature oil expression apparatus of claim 7, wherein, The length of the feeding area is 0.42L, the length of the main pressing area is 0.43L, and the length of the cake discharging area is 0.15L.

9. The low-temperature oil expression apparatus of claim 3, wherein, The screw elements are all left-handed.

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