Process for preparing skin care product by utilizing dendrobium officinale kimura ex migo extract

Abstract

The invention relates to the technical field of preparation of dendrobium officinale extracts, in particular to a process for preparing a skin care product by utilizing dendrobium officinale extracts, which comprises the following steps: pouring granular dendrobium officinale raw materials into a material channel, simultaneously introducing liquid nitrogen with the temperature of-50 to-30 DEG C into two liquid nitrogen pipes, circularly flowing, and embrittling the dendrobium officinale raw materials through low-temperature freezing; opening the plug block to release the frozen dendrobium nobile raw material, and crushing the dendrobium nobile raw material by the rotating crushing rack; a water pump is started to extract an extracting solution into the concentration tank through the extraction cylinder, and then the extracting solution is mixed through the micro-fluidic nano-emulsification reactor to form an emulsion. A vacuum sealed gradient freezing channel is constructed through a spiral liquid nitrogen pipe-material pipe staggered nested structure, so that dendrobium officinale raw materials are embrittled step by step at low temperature, low-temperature crushing is completed by combining linkage beating of a vibrating ring-crushing frame, the retention rate of polysaccharide is increased, and the quality of the dendrobium officinale raw materials is improved. And meanwhile, a servo electric cylinder drives a plug block dynamic sealing and liquid nitrogen pipe centered inserting structure, and it is guaranteed that oxygen is isolated in the whole crushing process.

Description

Technical Field

[0001] The present invention relates to the technical field of the preparation of Dendrobium extracts, and specifically to a process for preparing skin care products using extracts of Dendrobium officinale Background Art

[0002] As a high-value medicinal plant, Dendrobium officinale has antioxidant and anti-inflammatory effects in skin care products due to its active ingredients such as polysaccharides and flavonoids. The authorized publication number is CN107789282B, which discloses a skin care product containing extracts of Dendrobium officinale and plant whitening agents, as well as its preparation method and application. The skin care product of the present invention uses effective substances such as extracts of Dendrobium officinale, oat kernel extract, tremella extract, prickly pear stem extract, and plant whitening agents as raw materials. It not only has natural ingredients but also can achieve good whitening, acne removal, and wrinkle removal effects. At the same time, the present invention also provides a preparation method for the skin care product containing extracts of Dendrobium officinale and plant whitening agents. The preparation method includes the following steps: (a) Heating and mixing water and water-phase auxiliary materials until the water-phase raw materials are completely dissolved; (b) Heating and mixing oil-phase auxiliary materials until the oil-phase auxiliary materials are dissolved and mixed evenly; (c) Pumping the mixed oil-phase auxiliary materials into an emulsifying pan under vacuum conditions, and then adding the mixed water-phase auxiliary materials; (d) Cooling down, adding extracts of Dendrobium officinale, oat kernel extract, tremella extract, prickly pear stem extract, and plant whitening agents; (e) Continuing to cool down, adding preservatives and fragrances; (f) Continuing to cool down, restoring to atmospheric pressure, stopping stirring and discharging, and thus obtaining the skin care product containing extracts of Dendrobium officinale and plant whitening agents.

[0003] It can be seen that the above-mentioned invention uses a mixed heating process in the preparation of skin care products using Dendrobium, and stirs and mixes through cooling to obtain skin care products; traditional extraction processes mostly use high-temperature water extraction or organic solvent extraction, which easily leads to the degradation of heat-sensitive components, low extraction efficiency, and high solvent residues; the crushing process often uses mechanical stirring and grinding, which easily causes local temperature rise and oxidation loss of active components due to the open environment. Therefore, there is an urgent need to develop a process equipment integrating low-temperature crushing, intelligent field-assisted extraction, and high-efficiency purification to break through the bottleneck of the retention rate of active components and process energy efficiency. Summary of the Invention

[0004] In order to overcome the defects in the prior art, the purpose of the present invention is to provide a process for preparing skin care products using extracts of Dendrobium officinale to solve the problem of oxidation loss of Dendrobium active components in the traditional heating and stirring process mentioned in the above background art.

[0005] To achieve the above object, the present invention provides a process for preparing skin care products using extracts of Dendrobium officinale, which includes extracting and concentrating Dendrobium extracts using an extraction tank and a concentration tank. Inside the upper half of the extraction tank, a pair of spiral and misaligned and snap-connected material pipes are suspended. Inside the material pipes, a liquid nitrogen pipe is spirally connected, and a material channel is formed between the material pipes and the liquid nitrogen pipe. Below the two material pipes, a material crushing rack is provided. The lower end of the material pipe is slidably snap-connected with a plug. Inside the bottom of the extraction tank, an extraction cylinder is provided. Above the extraction cylinder, a water pump is coaxially connected. On the outer wall of the bottom of the extraction tank, a number of microwave generators are equidistantly installed. On the bottom end face of the extraction tank, a number of ultrasonic generators are equidistantly installed. Inside the concentration tank, a filter membrane group is slidably arranged along its axis. At the rear side of the top of the concentration tank, a vacuum pump and a refrigeration system device are provided. It includes the following steps: S1. Pour granular Dendrobium raw materials into the two material pipes to fill the material channel. At the same time, introduce liquid nitrogen with a temperature of -50 to -30 °C into the two liquid nitrogen pipes and circulate it, and freeze and embrittle the Dendrobium raw materials through low temperature. S2. Then open the plug to release the frozen Dendrobium raw materials, which are broken by the rotating material crushing rack to obtain crushed materials with a particle size of 0.5 - 2 mm. S3. Extract the crushed materials through time-sequentially controllable ultrasonic-microwave synergistic extraction, and switch the ultrasonic and microwave action modes according to the real-time moisture content. S4. Start the water pump to pump the extract through the extraction cylinder into the concentration tank. S5. Remove impurities in the extract by moving the filter membrane group along the concentration tank to the bottom, and concentrate it to a solid content of 15 - 25% by operating a low-temperature vacuum environment through the vacuum pump and the refrigeration system device. S6. Then suck the concentrated extract and liposomes into a microfluidic nanoemulsification reactor for mixing to form an emulsion with a particle size ≤ 100 nm, and fill the emulsion under a nitrogen protection environment.

[0006] As a further improvement of this technical solution, the time sequence control of the ultrasonic-microwave synergistic extraction in step S3 satisfies the following conditions: When the moisture content > 60%, the microwave power density of the microwave generator is 1.5 W / cm³, and after acting for 5 - 15 min, it is switched to the ultrasonic wave of the ultrasonic generator at 20 kHz and acts for 10 - 20 min. When the moisture content ≤ 60%, the ultrasonic-microwave phase difference is 180°, the frequency ratio is 1:120, ultrasonic 20 kHz: microwave 2370 MHz, to improve the extraction rate of total phenolic substances.

[0007] The above settings can perform low-temperature treatment with traditional liquid nitrogen crushing. However, the open environment leads to the oxidation of active ingredients. This material flow channel blocks the contact between the material and oxygen during the crushing process, improving the polysaccharide retention rate. By freezing and embrittling the Dendrobium raw material, the impact force during crushing is reduced, thereby reducing the crushing energy consumption.

[0008] As a further improvement of this technical solution, in steps S1 and S2, a liquid nitrogen crushing part is composed of two material pipes, two liquid nitrogen pipes, a crushing rack, and a plug. A vibration ring is connected between the lower ends of the two material pipes. The bottom surface of the vibration ring is provided with a number of convex strips at equal intervals in a ring shape. A linkage ring is coaxially connected to the center of the crushing rack. The top surface of the linkage ring is provided with a number of vibration blocks at equal intervals in a ring shape. The number of vibration blocks is in snap-fit sliding connection with the number of convex strips. A servo motor for driving the crushing rack to rotate and strike the material is installed on the outer wall of the extraction tank.

[0009] The above settings increase the material aggregation space through the material channel, and it is evenly frozen and embrittled. The material falling from the material channel is struck by the rotation of the crushing rack; the plug plays a sealing role to ensure that the freezing environment remains sealed.

[0010] As a further improvement of this technical solution, in step S2, while starting the servo motor to drive the crushing rack to rotate and strike the material, a number of vibration blocks on the linkage ring continuously rotate and trigger the up and down vibration of the vibration ring, thereby driving the two material pipes to discharge materials quickly.

[0011] As a further improvement of this technical solution, the crushing rack is composed of a ring bar and a number of crushing rods embedded in its inner wall. The inner ends of the number of crushing rods are in plug-in fit with the outer side wall of the linkage ring. Among them, the ring bar is adaptively snap-fitted with the inner wall of the extraction tank and is limited by a number of pairs of pins on the upper and lower sides of the side wall of the extraction tank.

[0012] The above settings limit the stable rotation of the crushing rack against the wall through the pins, and the linkage ring is stably rotated by the suspension of a number of crushing rods, triggering the up and down vibration of the vibration ring, thereby driving the vibration of the material pipes to discharge materials and avoiding blockage.

[0013] As a further improvement of this technical solution, in step S2, the plug is in snap-fit connection with the lower end of the material pipe. A servo electric cylinder for driving the plug to move horizontally is installed on the outer wall of the extraction tank.

[0014] As a further improvement of this technical solution, in step S4, an extraction part is composed of an extraction cylinder and a water pump. A number of liquid passing holes are opened at equal intervals in a ring shape on the outer wall of the extraction cylinder. A filter membrane cylinder is sleeved on the inner wall of the extraction cylinder.

[0015] The side wall of the above-mentioned filter membrane cylinder is wrapped with a microfiltration membrane, which is mainly used to remove suspended solids and particulate matter in the solution; a number of arc-shaped openings are opened on the side wall of the filter membrane cylinder, so that the extraction liquid is sucked into the interior of the extraction cylinder, and at the same time, the support strength of the microfiltration membrane is increased; As a further improvement of the technical solution, the water pump is installed in the middle of the top of the extraction tank, and a straight pipe is coaxially connected between the water inlet end of the water pump and the extraction cylinder, and the straight pipe passes through the central holes of the vibration ring and the linkage ring.

[0016] As a further improvement of the technical solution, in step S5, a purification part is composed of a filter membrane group, a reduction motor and a transmission lead screw. The filter membrane group is composed of a ceramic membrane and a hollow fiber membrane coaxially stacked. Ring sleeves are clamped on the central holes and the outsides of the ceramic membrane and the hollow fiber membrane. The ring sleeve located in the central hole is threadedly connected to the transmission lead screw.

[0017] The above setting enables the filter membrane group to move axially along the transmission lead screw, and extrudes the extraction liquid for reverse osmosis filtration. The impurities are intercepted at the bottom of the filter membrane group and are to be discharged after the electromagnetic valve at the discharge nozzle at the bottom of the concentration tank is opened.

[0018] As a further improvement of the technical solution, the ring sleeve located on the outside is an irregular circular ring and is slidably sleeved in adaptation with the inner wall of the concentration tank, and a mesh cover is clamped between the inner and outer ring sleeves.

[0019] The above setting is used to enhance the extrusion resistance of the filter membrane group and ensure the smooth progress of filtration.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. For the process of preparing skin care products using Dendrobium officinale extract, through the spiral liquid nitrogen pipe - material pipe misaligned nesting structure, a vacuum-sealed gradient freezing channel is constructed, enabling the Dendrobium officinale raw materials to be gradually embrittled at low temperature. Combined with the linkage beating of the vibration ring - crushing rack, low-temperature crushing is completed, and the polysaccharide retention rate is increased. At the same time, through the dynamic sealing of the servo electric cylinder driving the plug and the structure of the liquid nitrogen pipe being centered and inserted, it is ensured that the oxygen is completely isolated during the crushing process, reducing the oxidation loss of polyphenols.

[0021] 2. For the process of preparing skin care products using Dendrobium officinale extract, through the ultrasonic and microwave anti-phase synergistic control, the precise superposition of the fluctuating energy fields is realized by using the phase-locked technology, forming an instantaneous ultra-high pressure and high temperature at the cell wall, improving the cell wall breaking rate and reducing the unit energy consumption.

[0022] 3. For the process of preparing skin care products using Dendrobium officinale extract, through the integrated design of the extraction cylinder - filter membrane cylinder and the axially movable filter membrane group in the concentration tank, seamless connection of the online microfiltration and reverse osmosis concentration of the extraction liquid is realized, reducing the loss rate of active ingredients and prolonging the membrane life.

[0023] 4. For the process of preparing skin care products using Dendrobium officinale extract, through the linkage mechanism of the crushing rack - vibration ring, while rotating and beating the materials, high-frequency vibration is triggered, improving the feeding speed and completely solving the problem of freezing material blockage. Description of the Drawings

[0024] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the disclosure of the present invention in any way. Additionally, the shapes and proportional dimensions of the various components in the figures are merely schematic and are used to assist in understanding the present invention, rather than specifically defining the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art, under the teachings of the present invention, can select various possible shapes and proportional dimensions according to specific circumstances to implement the present invention.

[0025] Figure 1 is the overall process flow chart of the present invention; Figure 2 is the schematic diagram of the assembly structure of the extraction tank and the concentration tank of the present invention; Figure 3 is the schematic diagram of the assembly structure of the liquid nitrogen crushing part and the extraction part of the present invention; Figure 4 is for the present invention Figure 3 front view; Figure 5 is the schematic diagram of the assembly structure of the liquid nitrogen crushing part of the present invention; Figure 6 is the partial disassembly view of the liquid nitrogen crushing part of the present invention; Figure 7 is the schematic diagram of the assembly structure of the material crushing rack of the present invention; Figure 8 is the schematic diagram of the assembly structure of the two material pipes of the present invention; Figure 9 is the disassembly view of the extraction part of the present invention; Figure 10 is the disassembly view of the purification part of the present invention; The meanings of the various reference numerals in the figure are as follows: 100, extraction tank; 110, concentration tank; 120, microwave generator; 130, ultrasonic generator; 200, liquid nitrogen crushing part; 210, material pipe; 211, feeding nozzle; 212, vibration ring; 213, convex strip; 220, liquid nitrogen pipe; 221, recovery pipe; 222, nitrogen injection pipe; 230, material crushing rack; 2301, material crushing rod; 231, linkage ring; 2311, vibration block; 232, servo motor; 240, plug block; 241, servo cylinder; 300, extraction part; 310, extraction cylinder; 311, liquid through hole; 320, filter membrane cylinder; 330, water pump; 400, purification part; 410, filter membrane group; 411, mesh cover; 420, reduction motor; 430, transmission lead screw. Detailed implementation manners

[0026] With reference to the accompanying drawings and the description of the specific embodiments of the present invention, the details of the present invention can be more clearly understood. However, the specific embodiments of the present invention described herein are only for the purpose of explaining the present invention and should not be construed in any way as a limitation of the present invention. Under the teaching of the present invention, the concepts of those skilled in the art are based on any possible variations of the present invention, and all of these should be regarded as belonging to the scope of the present invention. The terms "installation" and "connection" should be understood in a broad sense, which can be directly connected or indirectly connected through an intermediate medium.

[0027] The orientation or positional relationship indicated by the terms "central axis", "vertical", "horizontal", "front", "back", "up", "down", "left", "right", "top", "bottom", "inner", "outer", etc. used in this article is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, in the description of the present invention, the meaning of "several" is two or more, unless otherwise specifically defined.

[0028] Please refer to Figures 1 - 10 As shown, the present invention provides a device for preparing skin care products using Dendrobium officinale extract, including using an extraction tank 100 and a concentration tank 110 for the extraction and concentration treatment of Dendrobium officinale extract. A pair of spiral and staggeredly engaged material pipes 210 are suspended inside the upper half of the extraction tank 100. A liquid nitrogen pipe 220 is spirally connected inside the material pipe 210. A material channel is formed between the material pipe 210 and the liquid nitrogen pipe 220 to increase the material aggregation space and make it evenly frozen and embrittled. A crushing rack 230 is arranged below the two material pipes 210 to rotate and strike the material falling from the material channel. A plug 240 is slidably engaged at the lower end of the material pipe 210 to play a sealing role and ensure that the freezing environment remains sealed. A number of microwave generators 120 are equally spaced and installed on the outer wall of the bottom of the extraction tank 100 to radiate microwaves into the tank through a circular wave with a frequency of 2370 MHz to form a uniform electromagnetic field. A number of ultrasonic generators 130 are equally spaced and installed on the bottom end surface of the extraction tank 100; a piezoelectric ceramic transducer array is used, with a frequency of 20 - 100 kHz, and sound waves are transmitted to the material through the liquid medium in the tank. A vacuum pump and a refrigeration system device are arranged at the rear side of the top of the concentration tank 110. The microwave generators 120 and the ultrasonic generators 130 are prior arts and will not be elaborated here.

[0029] As Figures 2 - 7As shown in the figure, the liquid nitrogen crushing part 200 is composed of two material pipes 210, two liquid nitrogen pipes 220, a crushing rack 230 and a plug 240. A vibration ring 212 is connected between the lower ends of the two material pipes 210. A number of convex strips 213 are equidistantly arranged in a ring shape on the bottom surface of the vibration ring 212. A linkage ring 231 is coaxially connected to the center of the crushing rack 230. A number of vibration blocks 2311 are equidistantly arranged in a ring shape on the top surface of the linkage ring 231. The number of vibration blocks 2311 is in snap-fit sliding connection with the number of convex strips 213. A servo motor 232 for driving the crushing rack 230 to rotate and beat the material is installed on the outer wall of the extraction tank 100; a worm gear is sleeved at the lower end of the linkage ring 231, and the output shaft of the servo motor 232 penetrates through the extraction tank 100 and a worm meshing with the worm gear is sleeved in the middle to transmit the torque.

[0030] The upper end of the material pipe 210 is connected and welded with a feeding nozzle 211 that penetrates to the outside of the lid of the extraction tank 100 for adding Dendrobium materials; the upper end of the liquid nitrogen pipe 220 is connected and welded with a nitrogen injection pipe 222 that penetrates out of the feeding nozzle 211, and liquid nitrogen is injected through the liquid nitrogen supply system; the lower end of the liquid nitrogen pipe 220 is horizontally extended with a recovery pipe 221, and the recovery pipe 221 penetrates through the outer wall of the extraction tank 100 so as to be docked with the liquid nitrogen supply system for recycling.

[0031] Further, while starting the servo motor 232 to drive the crushing rack 230 to rotate and beat the material, the number of vibration blocks 2311 on the linkage ring 231 continuously rotates to trigger the up and down vibration of the vibration ring 212, thereby driving the two material pipes 210 to quickly discharge the material.

[0032] The crushing rack 230 is composed of a ring bar and a number of crushing rods 2301 embedded in its inner wall, and the inner ends of the number of crushing rods 2301 are in plug-in connection with the outer side wall of the linkage ring 231 to beat the falling material through the number of crushing rods 2301; among them, the ring bar is adaptively clamped with the inner wall of the extraction tank 100 and is limited by a number of pairs of pins on the upper and lower sides of the side wall of the extraction tank 100, so that the crushing rack 230 stably rotates against the wall, and the linkage ring 231 is stably rotated by being suspended by the number of crushing rods 2301, thereby triggering the up and down vibration of the vibration ring 212 to drive the material pipe 210 to vibrate and discharge the material to avoid blockage.

[0033] Further, the plug 240 is in snap-fit connection with the lower end of the material pipe 210 to play a plugging role; a servo electric cylinder 241 for driving the plug 240 to move horizontally is installed on the outer wall of the extraction tank 100. The output shaft of the servo electric cylinder 241 penetrates into the extraction tank 100 and is fixedly connected with the side end of the plug 240 through bolts, and the liquid nitrogen pipe 220 is slidably inserted into the central hole of the plug 240 to stably center the liquid nitrogen pipe 220 in the material pipe 210.

[0034] Specifically, as Figure 9As shown in the figure, an extraction cylinder 310 is provided inside the bottom of the extraction tank 100. A water pump 330 is coaxially connected above the extraction cylinder 310. The extraction part 300 is composed of the extraction cylinder 310 and the water pump 330. A number of liquid through holes 311 are arranged at equal intervals in a ring shape on the outer wall of the extraction cylinder 310. A filter membrane cylinder 320 is sleeved on the inner wall of the extraction cylinder 310. A number of arc-shaped openings are arranged on the side wall of the filter membrane cylinder 320, so that the extraction liquid is sucked into the extraction cylinder 310; a microfiltration membrane is wrapped outside the side wall of the filter membrane cylinder 320, and the pore size is 10-50 microns, which is mainly used to remove suspended solids and particulate matter in the solution. The height of the arc-shaped opening is 5-8 mm, so as to increase the support strength of the microfiltration membrane.

[0035] Further, as Figure 2 shown, the water pump 330 is installed in the middle of the top end of the extraction tank 100, and a straight pipe is coaxially connected between the water inlet end of the water pump 330 and the extraction cylinder 310. The straight pipe passes through the central holes of the vibration ring 212 and the linkage ring 231 to position its movement.

[0036] Specifically, as Figure 10 shown, a filter membrane group 410 is slidably arranged axially inside the concentration tank 110. The purification part 400 is composed of the filter membrane group 410, a reduction motor 420 and a transmission lead screw 430. The filter membrane group 410 is composed of a ceramic membrane and a hollow fiber membrane coaxially stacked. Ring sleeves are clamped on the central holes and the outsides of the ceramic membrane and the hollow fiber membrane. The ring sleeve located in the central hole is threadedly connected with the transmission lead screw 430.

[0037] Further, the ring sleeve located on the outside is an irregular circular ring and is slidably sleeved in a matching manner with the inner wall of the concentration tank 110, so that the filter membrane group 410 moves axially along the transmission lead screw 430, and the extraction liquid is squeezed for reverse osmosis filtration. The impurities are intercepted at the bottom of the filter membrane group 410 and are discharged after the electromagnetic valve is opened at the discharge nozzle at the bottom of the concentration tank 110; a wire mesh cover 411 is clamped between the inner and outer ring sleeves to enhance the extrusion resistance of the filter membrane group 410 and ensure the smooth progress of filtration.

[0038] Using the above equipment to prepare skin care products according to the present invention includes the following steps: S1. Pour the granular dendrobium raw materials into the two material pipes 210 to fill the material channel. At the same time, introduce liquid nitrogen at a temperature of -50 to -30 °C into the two liquid nitrogen pipes 220 and circulate it, and freeze the dendrobium raw materials by low-temperature freezing; since traditional liquid nitrogen crushing can only be processed at low temperature, the open environment causes oxidation of active ingredients. This material channel blocks the contact between the material and oxygen during the crushing process, and improves the polysaccharide retention rate; S2. Then open the plug 240 to release the frozen dendrobium raw materials, which are broken by the rotating crushing rack 230 to obtain crushed materials with a particle size of 0.5-2 mm; by freezing and embrittling the dendrobium raw materials, the impact force during crushing is reduced, thereby reducing the crushing energy consumption; S3. Extract the crushed materials through time-sequentially controllable ultrasonic-microwave synergistic extraction, and switch the ultrasonic and microwave action modes according to the real-time moisture content; Among them, the time sequence control of the ultrasonic-microwave synergistic extraction satisfies the following conditions: When the moisture content > 60%, the microwave power density of the microwave generator 120 is 1.5 W / cm³, and after acting for 5 - 15 min, it is switched to the ultrasonic wave of the ultrasonic generator 130 at 20 kHz and acts for 10 - 20 min; When the moisture content ≤ 60%, the phase difference between the ultrasonic wave and the microwave is 180°, the frequency ratio is 1:120, ultrasonic 20 kHz: microwave 2370 MHz, so as to improve the extraction rate of total phenolic substances; Generate a synchronization signal through a field-programmable gate array to control the drive circuits of the ultrasonic transducer and the microwave magnetron; set the time delay Δt = 1 / 2f of the microwave sine wave and the ultrasonic pulse, where f is the ultrasonic frequency, so that the phase difference between the two is stabilized at 180° ± 5°; under the condition of a phase difference of 180°, the collapse moment of the ultrasonic cavitation bubbles is superimposed on the peak value of the microwave high-frequency electric field, generating a local ultra-high pressure > 100 MPa and an instantaneous high temperature > 5000 K, thereby strongly damaging the cell wall of Dendrobium officinale; Example parameters: Ultrasonic frequency 20 kHz → period T = 50 μs → Δt = 25 μs (delay half cycle); Microwave frequency 2370 MHz → period ≈ 0.422 ns, and precise synchronization needs to be achieved through a high-frequency signal phase-locked loop; S4. Start the water pump 330 to pump the extract into the interior of the concentration tank 110 through the extraction cylinder 310; the extract enters the water pump 330 after being filtered by the filter membrane cylinder 320, and the impurities are intercepted outside the extraction cylinder 310; S5. Remove the impurities in the extract by moving the filter membrane group 410 along the concentration tank 110 to the bottom, and concentrate it to a solid content of 15 - 25% by operating a low-temperature vacuum environment through a vacuum pump and a refrigeration system equipment; S6. Then suck the concentrated extract and liposomes into the microfluidic nanoemulsification reactor for mixing to form an emulsion with a particle size ≤ 100 nm, and fill the emulsion under a nitrogen protection environment to obtain a skin care product.

[0039] It should be noted that the vacuum pump, the refrigeration system equipment and the microfluidic nanoemulsification reactor are prior arts and will not be elaborated here; the above embodiments are only for explaining the technical concept and features of the present invention, and the purpose is to enable those familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A process for preparing skin care products using Dendrobium officinale extract, characterized in that: An extraction tank (100) and a concentration tank (110) are used to extract and concentrate a dendrobium officinale extract; a pair of spirally shaped and staggered material pipes (210) are suspended in the upper half of the extraction tank (100); a liquid nitrogen pipe (220) is spirally connected to the inside of the material pipe (210); a material channel is formed between the material pipe (210) and the liquid nitrogen pipe (220); a material crushing rack (230) is provided below the two material pipes (210); a plug (240) is slidably engaged at the lower end of the material pipe (210); An extraction cylinder (310) is arranged in the bottom of the extraction tank (100); a water pump (330) is coaxially connected to the top of the extraction cylinder (310); a plurality of microwave generators (120) are installed at equal intervals on the outer wall of the bottom of the extraction tank (100); and a plurality of ultrasonic generators (130) are installed at equal intervals on the bottom end surface of the extraction tank (100); a filter membrane group (410) is slidably arranged in the interior of the concentration tank (110) along the axial direction thereof; and a vacuum pump and a cooling system device are arranged at the rear side of the top of the concentration tank (110); The following steps are involved: S1, pouring granular dendrobium raw materials into two material pipes (210) to fill the material channel, and simultaneously introducing liquid nitrogen at a temperature of -50 to -30°C into two liquid nitrogen pipes (220) and circulating the liquid nitrogen to embrittle the dendrobium raw materials through low-temperature freezing; S2, opening the plug (240) again to release the frozen dendrobium raw material to be broken by the rotating crushing rack (230), thereby obtaining crushed material with a particle size of 0.5-2 mm; S3, extracting the crushed materials through time-controlled ultrasonic-microwave synergistic extraction, switching the ultrasonic and microwave action modes according to the real-time moisture content; S4, starting the water pump (330) to extract the extract through the extraction cylinder (310) into the concentration tank (110); S5, removing impurities in the extract by moving the filter membrane group (410) along the concentration tank (110) to the bottom, and concentrating the extract to a solid content of 15-25% by operating a vacuum pump and a cooling system device in a low-temperature vacuum environment; S6. The concentrated extract and the liposomes are then pumped into a microfluidic nanoemulsification reactor for mixing to form an emulsion with a particle size of ≤100 nm, and the emulsion is filled under a nitrogen protection environment.

2. The process for preparing skin care products using the extract of Dendrobium officinale according to claim 1, characterized in that: The timing control of the ultrasound-microwave collaborative extraction in step S3 satisfies the following conditions: When the moisture content is greater than 60%, the microwave power density of the microwave generator (120) is 1.5 W / cm³, and the microwave power density is applied for 5-15 minutes, and then the microwave power of the ultrasonic generator (130) is switched to 20 kHz and applied for 10-20 minutes; When the moisture content was ≤60%, the phase difference between ultrasound and microwave was 180°, the frequency ratio was 1:120, and ultrasound was 20kHz: microwave was 2370MHz, so as to improve the extraction rate of total phenolic substances.

3. The process for preparing skin care products using the extract of Dendrobium officinale according to claim 2, characterized in that: In the steps S1 and S2, the liquid nitrogen crushing section (200) is composed of two material pipes (210), two liquid nitrogen pipes (220), a crushing rack (230) and a plug (240); a vibration ring (212) is connected between the lower ends of the two material pipes (210); the bottom surface of the vibration ring (212) is provided with a plurality of convex strips (213) in a circular shape and at equal intervals; a linkage ring (231) is coaxially connected to the center of the crushing rack (230); the top surface of the linkage ring (231) is provided with a plurality of vibration blocks (2311) in a circular shape and at equal intervals; the plurality of vibration blocks (2311) are engaged and slidably matched with the plurality of convex strips (213); and a servo motor (232) for driving the crushing rack (230) to rotate and punch materials is installed on the outer wall of the extraction tank (100).

4. The process for preparing skin care products using the extract of Dendrobium officinale according to claim 3, characterized in that: In step S2, the servo motor (232) is started to drive the material crushing frame (230) to rotate and punch materials, while the plurality of vibration blocks (2311) on the linkage ring (231) continuously rotate to trigger the vibration ring (212) to vibrate up and down, thereby driving the two material pipes (210) to quickly discharge materials.

5. The process for preparing skin care products using the extract of Dendrobium officinale according to claim 4, characterized in that: The crushing rack (230) is composed of a ring bar and a plurality of crushing rods (2301) embedded in the inner wall thereof, and the inner ends of the plurality of crushing rods (2301) are plugged into and matched with the outer wall of the linkage ring (231), wherein the ring bar is adapted to be snap-fitted with the inner wall of the extraction tank (100) and is limited by a plurality of pairs of upper and lower pins on the side wall of the extraction tank (100).

6. The process for preparing skin care products using the extract of Dendrobium officinale according to claim 5, characterized in that: In the step S2, the plug (240) is engaged with the lower end of the material pipe (210), and a servo electric cylinder (241) for driving the plug (240) to move horizontally is installed on the outer wall of the extraction tank (100).

7. The process for preparing skin care products using the extract of Dendrobium officinale according to claim 6, characterized in that: In step S4, an extraction part (300) is composed of an extraction cylinder (310) and a water pump (330), the outer wall of the extraction cylinder (310) is provided with a plurality of liquid holes (311) at equal intervals in a circular shape, and the inner wall of the extraction cylinder (310) is provided with a filter membrane cylinder (320).

8. The process for preparing skin care products using the extract of Dendrobium officinale according to claim 7, characterized in that: The water pump (330) is installed at the middle of the top end of the extraction tank (100), and a straight pipe is coaxially connected between the water inlet end of the water pump (330) and the extraction cylinder (310), and the straight pipe passes through the central holes of the vibration ring (212) and the linkage ring (231).

9. The process for preparing skin care products using the extract of Dendrobium officinale according to claim 8, characterized in that: In step S5, a purification section (400) is composed of a filter membrane group (410), a reduction motor (420) and a transmission screw (430), wherein the filter membrane group (410) is composed of a ceramic membrane and a hollow fiber membrane coaxially stacked, and the center holes and outer sides of the ceramic membrane and the hollow fiber membrane are both clamped with ring sleeves, wherein the ring sleeve located in the center hole is threadedly connected to the transmission screw (430).

10. The process for preparing skin care products using the extract of Dendrobium officinale according to claim 9, characterized in that: The ring sleeve located on the outside is an irregular circular ring and is adapted to be slidably sleeved with the inner wall of the concentration tank (110), and a mesh cover (411) is clamped between the inner and outer ring sleeves.

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