Oil-water separation method and device for extracting peppermint oil

Abstract

The present invention discloses an oil-water separation method and device for extracting peppermint oil. The oil-water separation device separates the mixture, and the peppermint oil floats on the upper part of the outer layer of the oil-water separation device, and the water is on the lower part of the outer layer of the oil-water separator; by injecting a solution of the volume of the peppermint oil in the mixture into the outer layer, the peppermint oil floating on the upper part of the outer layer of the oil-water separation device overflows into the upper part of the inner layer of the oil-water separation device for extracting peppermint oil; the oil-water separation device designed by the present invention can guide the separated peppermint oil to a collection container by a lifting component after the separation is completed, without manual intervention. The tedious operation of manually transferring oil after each separation is avoided, and the separation efficiency and working stability are improved. Especially in mass production, the frequency of manual operation is reduced, so that the oil-water separation process can be carried out continuously, which can effectively save time and improve work efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of peppermint oil extraction, and in particular to an oil-water separation method and a device for peppermint oil extraction. Background Art

[0002] Peppermint oil is a natural plant essential oil widely used in the food, medicine and cosmetics industries. It is usually extracted from peppermint plants by distillation or solvent extraction. During the extraction process of peppermint oil, an oil-water mixture is often formed after distillation, in which the volume of peppermint oil is smaller and water occupies a larger part. In order to obtain high-purity peppermint oil, the oil and water must be separated effectively. The oil separated by traditional separation devices during the oil-water separation process usually needs to be manually transferred to a collection container. This operation method is not only inefficient, but also increases labor costs and the risk of human error.

[0003] In large-scale extraction processes, the volume of the oil-water mixture is usually large, and the traditional separation device has limited space and can only handle a certain amount of the mixture at a time. When a batch of separation is completed, the operator must manually transfer the peppermint oil from the separation device to the collection container. Since each operation requires manual intervention, the production process is greatly restricted, resulting in frequent production line stops and increased operation time. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the low efficiency problem of the existing peppermint oil extraction, a novel oil-water separation method and device for peppermint oil extraction are proposed.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: an oil-water separation method for extracting peppermint oil, S1 tests the oil-water content of a mixture of peppermint oil and water to be separated; S2 inputs the oil-water mixture into the outer layer of an oil-water separation device for extracting peppermint oil, uses a flow meter to obtain the volume of the mixture entering the outer layer of the oil-water separation device, and calculates the volume of peppermint oil in the mixture entering the outer layer of the oil-water separation device; S3 uses the oil-water separation device to separate the mixture, the peppermint oil floats on the upper part of the outer layer of the oil-water separation device, and the water is in the lower part of the outer layer of the oil-water separator; S4 injects a solution of the same volume as the peppermint oil in the mixture into the outer layer, so that the peppermint oil floating on the upper part of the oil-water separation device overflows and enters the upper part of the inner layer of the oil-water separation device for extracting peppermint oil; S5 discharges the remaining water at the bottom of the oil-water separation container.

[0007] As a preferred embodiment of the oil-water separation method for extracting peppermint oil of the present invention, the testing method of S1 at least includes volumetric method, centrifugation method, spectrophotometry and gravity stratification method, which are used to test the oil-water content.

[0008] As a preferred embodiment of the oil-water separation method for extracting peppermint oil of the present invention, the injection amount of the solution in S4 is the same as the calculated volume of peppermint oil, and the solution is a neutral solution that is pollution-free and does not affect the separation effect.

[0009] In order to solve the above technical problems, the present invention provides the following technical solutions: an oil-water separation device for extracting peppermint oil, comprising: a container shell, a solution inlet opened on the container shell, a collecting container slidably arranged inside the container shell, an elastic member arranged between the collecting container and the container shell, an overflow inlet opened on the upper part of the collecting container, an injection port opened below the collecting container, a piston slidably arranged in the collecting container, and a lifting component connected to the top of the piston; the piston is arranged between the overflow inlet and the injection port; the overflow inlet is hidden between the collecting container and the container shell by an elastic member; the space between the piston and the bottom of the collecting container is filled with a neutral solution; after the mixture of peppermint oil and water is separated by oil and water, the lifting component discharges the neutral solution in the collecting container to the bottom of the container shell through the movement of the piston, and at the same time exposes the hidden overflow inlet, so as to collect the peppermint oil floating on the upper part of the container shell.

[0010] As a preferred embodiment of the oil-water separation device for extracting peppermint oil of the present invention, the elastic member includes a mounting plate arranged above the collecting container and a compression spring arranged between the mounting plate and the outer wall of the container shell.

[0011] As a preferred embodiment of the oil-water separation device for extracting peppermint oil of the present invention, the oil-water separation device for extracting peppermint oil also includes a discharge assembly, including a discharge port arranged at the bottom of the container shell, a power source arranged below the discharge port, an eccentric wheel connected to the power source, a discharge plug abutting against the outer edge of the eccentric wheel, and a tension spring arranged between the discharge plug and the discharge port; the discharge plug can slide in the discharge port by rotating the discharge plug through the power source.

[0012] As a preferred embodiment of the oil-water separation device for extracting peppermint oil described in the present invention, an oil outlet assembly is provided at the bottom of the collecting container, and the oil outlet assembly includes a discharge box arranged above the piston, an oil outlet opening arranged on the side of the discharge box, a magnetic sheet slidably arranged in the discharge box, an oil discharge channel opened on the piston and the discharge plug, an oil outlet opened at the bottom of the collecting container, a blocking ball arranged on the oil outlet, a top pipe arranged on the discharge plug, and a connecting port opened on the top pipe; the oil discharge channel, the blocking ball, the oil outlet, and the top pipe are vertically arranged on the same straight line; the diameter of the oil discharge channel is larger than the diameter of the blocking ball; the diameter of the blocking ball is larger than the diameter of the oil outlet; the diameter of the oil outlet is larger than the diameter of the top pipe.

[0013] As a preferred embodiment of the oil-water separation device for extracting peppermint oil of the present invention, the top of the piston is made of magnetic material, and the discharge box and the plugging ball are made of non-magnetic material.

[0014] As a preferred embodiment of the oil-water separation device for extracting peppermint oil of the present invention, the pressure of the neutral solution on the magnetic sheet is less than the suction force of the magnetic sheet on the piston.

[0015] As a preferred embodiment of the oil-water separation device for extracting peppermint oil of the present invention, the bottom of the collecting container is concave.

[0016] Beneficial effects of the oil-water separation method and device for extracting peppermint oil of the present invention: After the separation is completed, the lifting component of the oil-water separation device designed by the present invention can guide the separated peppermint oil to the collection container without manual intervention. The cumbersome operation of manually transferring the oil after each separation is avoided, and the separation efficiency and working stability are improved. Especially in mass production, the frequency of manual operation is reduced, so that the oil-water separation process can be carried out continuously, which can effectively save time and improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0018] Figure 1 The figure is a schematic diagram of the overall structure of the oil-water separation device for extracting peppermint oil according to the present invention.

[0019] Figure 2 The present invention is a schematic diagram of the structure of a collecting container of the oil-water separation device for extracting peppermint oil.

[0020] Figure 3 The figure is a cross-sectional view of the overall structure of the oil-water separation device for extracting peppermint oil according to the present invention.

[0021] Figure 4 This is an enlarged view of the discharge component structure of the oil-water separation device for extracting peppermint oil of the present invention.

[0022] Figure 5 The figure is a cross-sectional view of the overall structure of the oil-water separation device for extracting peppermint oil according to the present invention.

[0023] Figure 6 This is an enlarged view of the oil outlet component structure of the oil-water separation device for extracting peppermint oil of the present invention.

[0024] Figure 7 This is an enlarged view of the oil outlet component structure of the oil-water separation device for extracting peppermint oil of the present invention. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0028] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included. Example 1

[0029] Provided is an oil-water separation method for extracting peppermint oil, the oil-water separation method for extracting peppermint oil comprising: S1 testing the oil-water content of a mixture of peppermint oil and water to be separated; S2 inputting the oil-water mixture into the outer layer of an oil-water separation device for extracting peppermint oil, using a flow meter to obtain the volume of the mixture entering the outer layer of the oil-water separation device, and calculating the volume of peppermint oil in the mixture entering the outer layer of the oil-water separation device; S3 using the oil-water separation device to separate the mixture, the peppermint oil floats on the upper part of the outer layer of the oil-water separation device, and the water is at the lower part of the outer layer of the oil-water separator; S4 injecting a solution of the volume of peppermint oil in the mixture into the outer layer, so that the peppermint oil floating on the upper part of the oil-water separation device overflows and enters the upper part of the inner layer of the oil-water separation device for extracting peppermint oil; S5 discharging the remaining water at the bottom of the oil-water separation container.

[0030] Furthermore, the testing method of S1 includes at least volumetric method, centrifugal method, spectrophotometric method and gravity stratification method, which are used to test the oil-water content.

[0031] The injection amount of the solution in S4 is the same as the calculated volume of the peppermint oil, and the solution is a neutral solution that is pollution-free and does not affect the separation effect.

[0032] Test method:

[0033] Volumetric method: Through the stratification of oil and water in the container, the volume occupied by oil and water is directly measured to obtain the volume ratio of oil and water.

[0034] Centrifugal method: The oil-water mixture is rotated at high speed through a centrifugal separation device. The different densities of oil and water are used to measure the volume of the two phases after separation and calculate the oil-water content.

[0035] Spectrophotometry: By selecting a suitable wavelength, measuring the absorbance change of the oil-water mixture, combining the known absorption characteristics of oil and water, the concentration of oil and water is deduced, and then the ratio of oil to water is calculated.

[0036] Gravity stratification method: The oil-water mixture is allowed to stand and naturally stratify according to density differences. The oil-water content is determined by measuring the volume ratio or mass ratio after stratification.

[0037] The tested oil-water mixture is transported to the outer layer of the oil-water separation device, and the volume of the mixture entering the oil-water separation device is accurately measured by a flow meter. If the volume ratio of oil to water is known, the volume of peppermint oil can be directly calculated based on the volume and ratio of the total mixture. If the mass ratio of oil to water is known, the mass of peppermint oil must be calculated first, then converted into volume by the density of peppermint oil, and finally the volume of peppermint oil is calculated based on the total mixture volume provided by the flow meter.

[0038] The oil-water separator uses the density difference between oil and water through standing, centrifugation or other methods to make the menthol oil float on the upper layer of the oil-water separator, while the water settles on the lower layer.

[0039] The injected solution will gradually push the peppermint oil floating on the upper layer, causing it to overflow and flow smoothly into the inner layer of the oil-water separation device. Example 2

[0040] Reference Figures 1 to 7 This embodiment is different from the first embodiment in that it provides an oil-water separation device for extracting peppermint oil, an oil-water separation device for extracting peppermint oil, comprising a container shell 100, a solution inlet 101 opened on the container shell 100, a collection container 102 slidably arranged inside the container shell 100, an elastic member 103 arranged between the collection container 102 and the container shell 100, an overflow inlet 104 opened on the upper part of the collection container 102, an injection port 105 opened below the collection container 102, a piston 106 slidably arranged in the collection container 102, and a piston 106 slidingly arranged with the piston 106. 06; the piston 106 is arranged between the overflow inlet 104 and the injection port 105; the overflow inlet 104 is hidden between the collection container 102 and the container shell 100 through the elastic member 103; the space between the piston 106 and the bottom of the collection container 102 is filled with a neutral solution; after the mixture of peppermint oil and water is separated by oil and water, the lifting component 107 discharges the neutral solution in the collection container 102 to the bottom of the container shell 100 through the movement of the piston 106, and at the same time exposes the hidden overflow inlet 104, so as to collect the peppermint oil floating on the upper part of the container shell 100. Among them, the space between the container shell 100 and the collection container 102 is the outer layer of the separation device, and the space in the collection container 102 is the inner layer of the separation device. A one-way valve is arranged at the injection port 105, and the liquid in the collection container 102 can be discharged into the container shell 100 through the injection port 105, but not vice versa. The distance that the piston 106 moves in the collection container 102 is controlled by the lifting assembly 107 to determine the volume of the neutral solution discharged, and the volume of the solution discharged is consistent with the calculated volume of pure peppermint oil in the mixture.

[0041] Specifically, the elastic member 103 includes a mounting plate 103a disposed above the collection container 102, and a compression spring 103b disposed between the mounting plate 103a and the outer wall of the container shell 100. A limit block is disposed on the mounting plate 103a, and when the lifting assembly 107 controls the piston 106 to move downward, the piston 106 drives the collection container 102 to slide, the compression spring 103b is compressed, and the limit block contacts the outer surface of the container shell 100, exposing the overflow inlet 104.

[0042] Furthermore, the oil-water separation device for extracting peppermint oil also includes a discharge assembly 108, including a discharge port 108a disposed at the bottom of the container shell 100, a power source 108b disposed below the discharge port 108a, an eccentric wheel 108c connected to the power source 108b, a discharge plug 108d that abuts against the outer edge of the eccentric wheel 108c, and a tension spring 108e disposed between the discharge plug 108d and the discharge port 108a; the discharge plug 108d is rotated by the power source 108b, and the discharge plug 108d can slide in the discharge port 108a. Among them, by controlling the power source 108b to drive the rotation of the eccentric wheel 108c, the separation device can be remotely controlled to automatically discharge the remaining water after the peppermint oil is collected.

[0043] Furthermore, an oil outlet assembly 109 is provided at the bottom of the collection container 102, and the oil outlet assembly 109 includes a discharge box 109a provided above the piston 106, an oil outlet opening 109b provided on the side of the discharge box 109a, a magnetic sheet 109c slidably provided in the discharge box 109a, an oil discharge channel 109d provided on the piston 106 and the discharge plug 108d, an oil outlet port 109f provided at the bottom of the collection container 102, and a magnetic sheet 109c provided on the discharge box 109a. The plugging ball 109g, the top pipe 109h arranged on the discharge plug 108d, and the connecting port 109j opened on the top pipe 109h; the oil discharge channel 109d, the plugging ball 109g, the oil outlet 109f, and the top pipe 109h are vertically arranged on the same straight line; the diameter of the oil discharge channel 109d is larger than the diameter of the plugging ball 109g; the diameter of the plugging ball 109g is larger than the diameter of the oil outlet 109f; the diameter of the oil outlet 109f is larger than the diameter of the top pipe 109h. In order to facilitate the removal of the peppermint oil collected in the collection container 102, an oil discharge pipeline is opened on the active piston 106 and the discharge plug 108d, and the peppermint oil in the collection container 102 can be discharged from the oil discharge channel 109d by controlling the power source 108b.

[0044] The top of the piston 106 is made of magnetic material, and the discharge box 109a and the plugging ball 109g are made of non-magnetic material.

[0045] Furthermore, the pressure of the neutral solution on the magnetic sheet 109 c is smaller than the suction force of the magnetic sheet 109 c on the piston 106 .

[0046] Furthermore, the bottom of the collection container 102 is concave.

[0047] The rest of the structure is the same as that of Example 1.

[0048] Operation process: The space between the container shell 100 and the collection container 102 is the outer layer of the oil-water separation device, and the space inside the collection container 102 is the inner layer of the oil-water separation device. After the oil-water separation device separates the mixture, the lifting assembly controls the piston 106 to move downward from the initial position, which is near the bottom of the overflow inlet 104. Since the friction force of the piston 106 on the collection container 102 is greater than the elastic force of the compression spring 103d, the compression spring 103b is compressed, and the collection container 102 slides downward, exposing the overflow inlet 104. Then the limit block on the mounting plate 103a is pressed against the surface of the container shell 100, and the collection container 102 is limited by the limit block. The piston 106 starts to move downward to discharge the neutral solution stored in the collection container 102 from the injection port 105 to the bottom of the outer layer of the oil-water separation device, and at the same time, the menthol oil floating on the upper part of the outer layer of the container enters the collection container 102 through the overflow inlet 104. Since the proportion of peppermint oil in the mixture is relatively small, the collection container 102 will not be filled. After the peppermint oil is collected, the power source 108b is started, and the power source 108b drives the eccentric wheel 108c to rotate a quarter of a turn to discharge the remaining water in the container shell 100. The power source 108b is reversed, the discharge port 108a is closed, and the mixture is re-added for separation.

[0049] When the peppermint oil in the collection container 102 is full, start the power source 108b, and the power source 108b rotates half a circle so that the top pipe 109h penetrates the oil outlet 109f, and lifts the blocking ball 109g into the oil discharge channel 109d, and conflicts with the magnetic sheet 109c in the oil discharge channel 109d. Then, the magnetic sheet 109c is lifted, so that the peppermint oil in the collection container 102 enters the connecting port 109j through the oil outlet opening 109b, and enters the oil discharge channel 109d in the discharge plug 108d through the connecting port 109j and is discharged.

[0050] After the peppermint oil is discharged, a neutral solution needs to be added to the collection container 102. The neutral solution is added to the outer layer of the oil-water separation device, and the piston 106 that slides to the bottom of the collection container 102 is pulled up through the lifting assembly 107. The neutral solution pushes away the blocking ball 109g and is sucked into the collection container 102 through the oil outlet 109f. After absorption, the ball rolls to the oil outlet 109f through the concave surface and blocks the oil outlet 109f. Then the discharge assembly 108 discharges the excess neutral solution.

[0051] Beneficial effect: When the mixture is injected into the solution inlet 101, the compression spring 103b lifts the collection container 102, so that the overflow inlet 104 is hidden, and the mixture cannot flow into the collection container 102. The lifting component 107 can guide the separated peppermint oil to the collection container 102 without manual intervention. The cumbersome operation of manually transferring the oil after each separation is avoided, and the separation efficiency and working stability are improved. Especially in mass production, the frequency of manual operation is reduced, so that the oil-water separation process can be carried out continuously, which can effectively save time and improve work efficiency.

[0052] Importantly, it should be noted that the construction and arrangement of the present application shown in a number of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, changes in orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature or number or position of the discrete element may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to an alternative embodiment. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also equivalent structure. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present invention. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0053] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment may not be described (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those features that are not relevant to implementing the invention).

[0054] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0055] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An oil-water separation device for extracting peppermint oil, characterized in that: The invention comprises a container shell (100), a solution inlet (101) provided on the container shell (100), a collection container (102) slidably arranged inside the container shell (100), an elastic member (103) arranged between the collection container (102) and the container shell (100), an overflow inlet (104) provided on the upper part of the collection container (102), an injection port (105) provided on the lower part of the collection container (102), a piston (106) slidably arranged in the collection container (102), and a lifting assembly (107) connected to the top of the piston (106); a one-way valve is provided at the injection port (105) so as to only allow the liquid in the collection container (102) to be discharged into the container shell (100) through the injection port (105); Testing the oil-water content of a mixture of peppermint oil and water to be separated, inputting the mixture of peppermint oil and water into the outer layer of an oil-water separation device, i.e., the outer space formed by the container shell (100) and the collection container (102); using a flow meter to obtain the volume of the mixture input into the outer layer of the oil-water separation device, and calculating the volume of peppermint oil therein; after the oil-water separation, the peppermint oil floats on the upper part of the outer layer of the oil-water separation device, and the water floats on the lower part of the outer layer of the oil-water separation device; The piston (106) is arranged between the overflow inlet (104) and the injection port (105), and its initial position is near the bottom of the overflow inlet (104). The space between the piston (106) and the bottom of the collection container (102) is filled with a neutral solution. In the initial state, the overflow inlet (104) is hidden between the collection container (102) and the container shell (100) by the elastic member (103). The piston (106) is pressed downward by the lifting assembly (107). The friction force exerted by the piston (106) on the collection container (102) is greater than the elastic force of the elastic member (103), so that the collection container (102) slides downward as a whole, and the overflow inlet (104) is exposed. At the same time, a neutral solution of the same volume as the peppermint oil in the mixture is injected into the outer layer of the oil-water separation device, so that the peppermint oil floating on the upper part of the outer layer of the oil-water separation device overflows into the inner layer of the oil-water separation device, i.e., the collection container (102) through the overflow inlet (104). When the collection container (102) slides downward for a certain distance, the mounting plate (103a) extending out of the container shell (100) contacts the top of the container shell (100), limiting its further downward movement. The piston (106) further slides downward to squeeze the neutral solution inside out of the collection container (102) through the injection port (105).

2. The oil-water separation device for extracting peppermint oil according to claim 1, characterized in that: A discharge assembly (108) is provided at the bottom of the container shell (100), comprising a discharge port (108a) provided at the bottom of the container shell (100), a power source (108b) provided below the discharge port (108a), an eccentric wheel (108c) connected to the power source (108b), a discharge plug (108d) abutting against an outer edge of the eccentric wheel (108c), and a tension spring (108e) provided between the discharge plug (108d) and the discharge port (108a); The power source (108b) is started to drive the eccentric wheel (108c) to rotate, thereby pushing up the discharge plug (108d), and the residual matter inside the container shell (100) is discharged from the discharge port (108a); the power source (108b) drives the eccentric wheel (108c) to rotate, the discharge plug (108d) returns to its original position, and the discharge port (108a) is closed.

3. The oil-water separation device for extracting peppermint oil according to claim 2, characterized in that: An oil outlet assembly (109) is provided at the bottom of the collection container (102), and the oil outlet assembly (109) comprises a discharge box (109a) provided above the piston (106), an oil outlet opening (109b) provided on the side of the discharge box (109a), a magnetic sheet (109c) slidably provided in the discharge box (109a), an oil discharge channel (109d) provided on the piston (106) and the discharge plug (108d), an oil outlet (109f) provided at the bottom of the collection container (102), a plugging ball (109g) provided on the oil outlet (109f), a top pipe (109h) provided on the discharge plug (108d), and a connecting port (109j) provided on the top pipe (109h); The oil discharge channel (109d), the plugging ball (109g), the oil outlet (109f), and the top pipe (109h) are vertically arranged on the same straight line; the diameter of the oil discharge channel (109d) is larger than the diameter of the plugging ball (109g); the diameter of the plugging ball (109g) is larger than the diameter of the oil outlet (109f); and the diameter of the oil outlet (109f) is larger than the diameter of the top pipe (109h); The power source (108b) is started to drive the eccentric wheel (108c) to rotate, and the discharge plug (108d) is lifted upward so that the jacking pipe (109h) on it passes through the oil outlet (109f), the plugging ball (109g) is lifted to enter the oil discharge channel (109d), and the magnetic sheet (109c) is lifted so that the peppermint oil flows out of the oil discharge channel (109d) through the connecting port (109j); the power source (108b) drives the eccentric wheel (108c) to rotate, the discharge plug (108d) returns to its original position, and the oil outlet (109f) is closed.

4. The oil-water separation device for extracting peppermint oil as claimed in claim 3, characterized in that: The top of the piston (106) is made of magnetic material, and the discharge box (109a) and the blocking ball (109g) are made of non-magnetic material.

5. The oil-water separation device for extracting peppermint oil as claimed in claim 4, characterized in that: The pressure exerted by the neutral solution on the magnetic sheet (109c) is smaller than the suction force exerted by the magnetic sheet (109c) on the piston (106).

6. The oil-water separation device for extracting peppermint oil as claimed in claim 3, characterized in that: The bottom of the collection container (102) is a concave surface, and the oil outlet (109f) is located on the concave surface.

7. The oil-water separation device for extracting peppermint oil according to claim 1, characterized in that: The testing methods for the oil-water content of a mixture of peppermint oil and water include volumetric method, centrifugal method, spectrophotometric method, and gravity stratification method.

8. The oil-water separation device for extracting peppermint oil according to claim 1, characterized in that: Neutral solution is a solution that is non-polluting and does not affect the separation effect.

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