Octagonal vacuum negative pressure drying equipment, method and production line

Abstract

The application discloses a star anise vacuum negative pressure drying equipment and method and a production line, and relates to the technical field of drying. The equipment comprises a drying cylinder, a vacuum negative pressure generating device, a condensing system and pure dew collecting device, and is connected with each other through vacuum pipelines. The drying cylinder is rotatably arranged on a support through a supporting shaft and is connected with a driving device on the support. A control box is further arranged on the support. A warehouse door is arranged on the side of the drying cylinder. An electromagnetic heating coil is arranged on the outer cylinder wall of the drying cylinder and is wrapped with a heat preservation layer. A stirring plate is arranged on the inner wall of the drying cylinder in the axial direction. A full-spectrum lamp is arranged in the drying cylinder, and the inner wall of the drying cylinder is a high reflection surface layer. The application realizes drying in a low-temperature negative pressure environment, obtains dried star anise, star anise pure dew and star anise oil, does not need to kill green or add other substances, does not destroy the original nature of the star anise and the origan acid in the star anise, and obtains a consistent reddish brown color with the natural drying after water boiling and killing green, and retains the most original quality and state of the star anise.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drying equipment, in particular to an eight-corner vacuum negative pressure drying equipment, method and production line. BACKGROUND

[0002] Guangxi is the main production area of star anise in China. As an important economic crop and spice, star anise is widely used in food seasoning, medicinal materials, and cosmetics industries. Guangxi star anise is favored by the domestic and international markets for its unique flavor and high quality. However, in the processing of star anise, drying is a critical step that directly affects the color, aroma, and final quality of star anise.

[0003] Traditional drying methods, such as sun drying and hot air drying, not only consume time and energy, but also easily lead to the loss of color and aroma of star anise. Traditional sun-dried star anise can only be obtained by boiling and blanching to get red star anise, but this process causes the loss of some homosallic acid in fresh star anise. The star anise dried by traditional drying production lines cannot achieve a reddish-brown color, and in order to achieve the best color, other substances (such as sulfur) need to be added. Therefore, the star anise dried by traditional sun drying and hot air drying methods cannot retain the characteristics of star anise and cannot meet the demand for healthy star anise quality of modern people. In addition, these methods are difficult to achieve uniform heating during drying, which can cause incomplete drying or over-drying of star anise, affecting product quality.

[0004] Patent 202123337997.4 discloses an intelligent star anise drying all-in-one machine, which includes a drying room main body, a dehumidification fan is fixedly arranged on the top of the drying room main body, a layered star anise material car is arranged in the drying room main body, the layered star anise material car includes a placing plate, a normal-pressure steam generator and an air source heat pump are fixedly arranged outside the drying room main body, a hot air circulating fan is fixedly arranged in the drying room main body, the input end of the dehumidification fan is connected to the inside of the drying room main body, and the output end of the dehumidification fan is connected to the outside of the drying room main body.

[0005] Patent CN202210617815.9 discloses a vacuum drying method for star anise, which includes (1) material selection: selecting and removing impurities from the harvested fresh star anise; (2) blanching: placing the selected star anise in water for blanching; (3) pre-drying: placing the blanched star anise on a tray and drying in a cool and ventilated place for pre-drying; (4) vacuum drying: placing the pre-dried star anise on a special rack with gauze in a vacuum drying box, and drying at a temperature of 65-80℃ and a vacuum degree of -0.05 to -0.08MPa; (5) packaging: bagging the dried star anise and storing in a warehouse.

[0006] The two schemes above respectively adopt hot air drying and vacuum drying, and the star anise is placed statically and is unevenly heated, the quality of the star anise cannot reach the best red-brown high-quality demand as a whole, and pure star anise hydrol and star anise oil cannot be collected. SUMMARY

[0007] In view of the deficiencies in the prior art, the present application provides a star anise vacuum negative pressure drying equipment, method and production line, which can realize rapid drying at a lower temperature and improve the drying quality of star anise by adopting electromagnetic heating, vacuum negative pressure environment and simulated sunlight technology, and solves the problems of uneven drying of star anise and poor color due to oxidation in the prior art.

[0008] The specific technical solutions are as follows:

[0009] In a first aspect, the present application discloses a star anise vacuum negative pressure drying equipment, which comprises a drying cylinder, a vacuum negative pressure generating device, a condensing system, a hydrol collecting device, and is connected with each other through a vacuum pipeline; the drying cylinder is rotatably arranged on a support through a supporting shaft and is connected with a driving device on the support, and a control box is further arranged on the support; a material inlet for feeding and discharging materials is arranged on the side of the drying cylinder, and a warehouse door for opening and closing the material inlet is arranged; an electromagnetic heating coil is arranged on the outer cylinder wall of the drying cylinder and is wrapped with a heat preservation layer; a stirring plate is arranged on the inner wall of the drying cylinder; a full-spectrum lamp is arranged in the drying cylinder, and the inner wall of the drying cylinder is a high-reflection surface layer.

[0010] Further to the above scheme, an automatic push-pull mechanism for opening and closing the warehouse door is arranged between the warehouse door and the drying cylinder.

[0011] Further to the above scheme, a plurality of annular support frames are arranged on the inner wall of the drying cylinder in the axial direction.

[0012] Further to the above scheme, the stirring plates are arranged on the inner wall of the drying cylinder in the axial direction, and the stirring plates are designed as inverted V-shaped structures, the larger end of each stirring plate is connected with the inner wall of the drying cylinder, and at least two stirring plates are arranged.

[0013] Further to the above scheme, the full-spectrum lamp is arranged along the central axis of the inner cavity of the drying cylinder, the full-spectrum lamp is a long strip-shaped lamp tube, and the two ends of the long strip-shaped lamp tube are respectively fixed with the drying cylinder.

[0014] Further to the above scheme, a lampshade is arranged at the full-spectrum lamp for protecting the lamp tube, and the lampshade is made of a material that does not absorb light spectrum.

[0015] Further to the above scheme, a baffle is arranged on the support along the axial lower end of the drying cylinder to symmetrically guide the discharge of materials.

[0016] In a second aspect, the present application discloses a drying method of a star anise vacuum negative pressure drying equipment.

[0017] ① open the door, the fresh star anise through the material port into the clean dry; close the door, while through the control box control open full spectrum lamp and drive device, rotating drying cylinder;

[0018] ② start electromagnetic heating coil heating, the drying cylinder temperature heated to the preset temperature, and dynamic maintenance;

[0019] ③ in the start heating, start vacuum negative pressure generating device, the vacuum degree in the drying cylinder is adjusted to the preset value, reach the preset value according to the material more and less keep a certain time, stop vacuum negative pressure generating device;

[0020] ④ wait for the star anise moisture in the drying cylinder natural evaporation, to the drying cylinder in the negative pressure reaches the preset value, start vacuum negative pressure generating device;

[0021] ⑤ cycle step ③-④ operation, until to reach the preset star anise drying value;

[0022] ⑥ before the discharge stop heating, open vacuum negative pressure generating device, according to the material more and less set 1 to 10 hours of drying time;

[0023] ⑦ reach the preset drying time, close the vacuum negative pressure generating device, the drying cylinder pressure relief;

[0024] ⑧ get dry star anise, star anise hydrol and star anise oil, sorting, packing.

[0025] Thirdly, the application discloses a kind of star anise vacuum negative pressure drying equipment drying method, the method is injected nitrogen, using air extraction, nitrogen circulation, specific steps are as follows:

[0026] ① open the door, the fresh star anise through the material port into the clean dry; close the door, while through the control box control open full spectrum lamp and drive device, rotating drying cylinder;

[0027] ② start electromagnetic heating coil heating, the drying cylinder temperature heated to the preset temperature, and dynamic maintenance;

[0028] ③ in the start heating, start vacuum negative pressure generating device, the vacuum degree in the drying cylinder is adjusted to the preset value, reach the preset value according to the material more and less keep a certain time, stop vacuum negative pressure generating device;

[0029] ④ nitrogen is injected into the drying cylinder, to the set preset value, stop nitrogen injection, reach the preset value according to the material more and less keep a certain time, start vacuum negative pressure generating device;

[0030] ⑤ cycle step ③-④ operation, until to reach the preset star anise drying value;

[0031] ⑥Stop heating before discharging, open the vacuum negative pressure generating device, and set the drying time of 1 to 10 hours according to the more or less of the material;

[0032] ⑦After reaching the preset drying time, close the vacuum negative pressure generating device, and release the pressure of the drying cylinder;

[0033] ⑧Obtain dried star anise, star anise hydrol, and star anise oil, sort, and pack.

[0034] In a fourth aspect, the application discloses a production line of a star anise vacuum negative pressure drying equipment, which comprises a material lifting equipment and a material conveying belt, the material lifting equipment is arranged on one side of a support, a discharge opening of the material lifting equipment is located directly above a drying cylinder and can correspond to a material opening of the drying cylinder, and the drying cylinder is arranged above the material conveying belt through the support.

[0035] Compared with the prior art, the application has the following beneficial effects:

[0036] (1) The vacuum negative pressure drying equipment of the application realizes uniform drying, optimal quality and color retention through the design structure.

[0037] (2) The fresh star anise is dried by using negative pressure and pure nitrogen in the drying cylinder of the application, and the dried star anise, star anise hydrol and star anise oil are not oxidized because there is no oxygen in the whole drying process and under the irradiation of the full-spectrum lamp simulating sunlight, so that the optimal taste, nutritional quality, pure fragrance and original color of the star anise are retained, that is, the dried star anise is reddish brown, the star anise hydrol and star anise oil are pure and transparent, and the oxidized star anise oil is yellow.

[0038] (3) The electromagnetic heating coil and the heat preservation layer of the outer wall of the drying cylinder of the application ensure the concentration and uniform distribution of heat, improve the drying efficiency and enhance the drying effect.

[0039] (4) The full-spectrum lamp in the drying cylinder of the application, the lampshade of the protection lamp tube which does not absorb the spectrum material, and the high-reflection surface layer of the inner wall of the cylinder simulate the natural sunlight irradiation effect, and the reddish brown effect is obtained without water boiling, without adding any other substances, and without losing the strontianic acid in the star anise.

[0040] (5) The application provides a drying method which adopts the mode of air extraction and nitrogen injection circulation (nitrogen injection is not allowed, but air is not allowed to enter), so that the star anise can be dried at a lower temperature, the quality and taste of the star anise are maximally retained, the drying efficiency is accelerated, and energy consumption is saved.

[0041] (6) The drying method of the application can prevent the oxidation and deterioration of the dried star anise, star anise hydrol and star anise oil by injecting nitrogen (nitrogen injection is not allowed, but air is not allowed to enter), and the star anise hydrol and star anise oil produced by the method are more mild and sweet than those produced by the traditional process.

[0042] (7)The structure design of the drying cylinder of the application can realize 360-degree forward rotation and 360-degree reverse rotation circulation, and the turnover baking process is assisted by the stirring plate and inverted V-shaped structure design in the cylinder, so that the star anise can be continuously turned over during the drying process, avoiding local overheating or uneven drying. The automatic push-pull mechanism design of the door simplifies the in-out operation of the star anise, and improves the automation degree of the production line.

[0043] (8)The application realizes the production of dry star anise, star anise hydrol, and star anise oil at the same time, the hydrol collection rate reaches more than 80%, improves the preservation, quality and other uses of the products, and increases the added value of the products. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 is the overall structure schematic diagram of the application;

[0045] Figure 2 is a perspective view of the drying cylinder arranged on the support;

[0046] Figure 3 is the A partial enlarged view of Figure 2 ;

[0047] Figure 4 is the perspective view of Figure 2 ;

[0048] Figure 5 is the left sectional view of Figure 2 ;

[0049] Figure 6 is the control box connection function schematic diagram of the application;

[0050] Figure 7 is the structure schematic diagram of the application with nitrogen protection;

[0051] Figure 8 is the production line schematic diagram of the application;

[0052] Figure 9 is the comparison diagram of dry star anise obtained by the application and traditional method;

[0053] Figure 10 is the comparison diagram of star anise oil obtained by the application and existing star anise oil.

[0054] In the attached diagram, 1-drying cylinder, 2-vacuum negative pressure generating device, 3-condensation system, 4-hydrosol collecting device, 5-vacuum pipe, 6-support shaft, 7-bracket, 8-drive device, 9-control box, 10-door, 11-electromagnetic heating coil, 12-insulation layer, 13-material feeding plate, 14-full spectrum lamp, 15-automatic push-pull mechanism, 16-ring support frame, 17-lamp cover, 18-baffle, 19-nitrogen generator, 20-material lifting equipment, 21-material conveyor belt, 22-temperature sensor, 23-humidity sensor, 24-pressure sensor. Detailed Implementation

[0055] The embodiments of the invention will be described in further detail below with reference to the accompanying drawings, so that the objectives, technical solutions and technical effects of the invention will be more clearly presented.

[0056] Example 1:

[0057] like Figures 1-6 As shown, the present invention discloses an octagonal vacuum negative pressure drying device, including a drying cylinder 1, a vacuum negative pressure generating device 2, a condensation system 3, and a hydrosol collecting device 4, which are interconnected through a vacuum pipeline 5. This device can dry octagonal star anise in a vacuum negative pressure oxygen-free environment, and simultaneously obtain dried octagonal star anise, octagonal hydrosol, and octagonal oil.

[0058] The drying cylinder 1 is rotatably mounted on the support 7 via the support shaft 6 and is connected to the drive device 8 on the support 7. The support 7 is also equipped with a control box 9. The drive device 8 includes a drive motor and a reducer. The reducer is connected to the support shaft 6. The drive device 8 can realize the drying cylinder 1 to rotate 360 ​​degrees forward and 360 degrees backward in a cyclical manner.

[0059] Several annular support frames 16 are arranged axially along the inner wall of the drying cylinder 1. The annular support frames 16 are evenly spaced and can reinforce the drying cylinder 1 to prevent deformation when a vacuum negative pressure is formed inside the drying cylinder 1. The drying cylinder 1 can be made of stainless steel plate of a certain thickness, such as 5mm. Specifically, the annular support frames 16 can be made of annular steel bars.

[0060] Electromagnetic heating coils 11 are evenly arranged on the outer wall of the drying cylinder 1 and wrapped with a heat insulation layer 12. The electromagnetic heating coils 11 are controlled by the control box 9 to achieve heating and temperature control of the inner cavity of the drying cylinder 1.

[0061] Here, a material-turning plate 13 is axially arranged on the inner wall of the drying cylinder 1, and the material-turning plate 13 has an inverted V-shaped structure. The larger end of the material-turning plate 13 is welded and fixed to the inner wall of the drying cylinder 1, and at least two material-turning plates 13 are evenly spaced. When the drying cylinder 1 is turned over for drying, the material-turning plate 13 can disperse the materials that are squeezed together, which plays a good auxiliary role in the uniform drying of the materials.

[0062] Here, the inner cavity of the drying cylinder 1 is provided with a full-spectrum lamp 14 along the central axis direction thereof; the full-spectrum lamp 14 is a long strip-shaped lamp tube, and the two ends of the lamp tube are fixed with the drying cylinder 1 respectively; a lamp shade 17 for protecting the lamp tube is arranged at the full-spectrum lamp 14, the lamp shade 17 is in the form of a tube, and the lamp shade 17 is made of quartz glass material; the inner wall of the drying cylinder 1 is a high-reflective surface layer. Here, the scheme simulates sunlight through the full-spectrum lamp 14, and the dried star anise obtained after drying has the same color as that dried naturally under sunlight after fixation, and the mangrove acid and the original essence in the star anise do not flow out, thereby ensuring the best quality and color of the dried star anise.

[0063] Here, a material port and a door 10 for opening and closing the material port are arranged on the outer side of the drying cylinder 1, and the door 10 is automatically opened and closed through an automatic push-pull mechanism 15 arranged between the door 10 and the drying cylinder 1. The sealing element arranged between the door 10 and the drying cylinder 1 is a key operation, and of course the push rod can be replaced by an air cylinder.

[0064] In the above scheme, the control box 9 is used to realize automatic control of drying, including heating, rotation, vacuumizing, etc. Various sensors, such as a temperature sensor 22, a humidity sensor 23, and a pressure sensor 24, are arranged in the drying cylinder 1, and the sensors can extend into the drying cylinder 1 along the cylinder wall. The various sensors are connected to the control box 9, so as to accurately control the drying state, and the drying data can be queried and controlled through a client. The vacuum negative pressure generating device 2 is provided with two vacuum pumps for alternating use. The air inlet end of the vacuum pump is connected to the drying cylinder 1 through a vacuum pipeline 5, the air outlet end of the vacuum pump is connected to a condensing system 3, and the condensing system 3 is connected to a pure dew collecting device 4.

[0065] Here, another installation mode of the drying cylinder 1 is also provided. The drying cylinder 1 is connected with the support 7 through a support shaft 6, and the drying cylinder 1 is rotatably and sealingly connected with the support shaft 6. That is, one end of the support shaft 6 is fixedly connected with the support 7, and the other end is rotatably and sealingly connected with the drying cylinder 1. At the same time, the support shaft 6 extends into the drying cylinder 1, thereby providing a relatively stable installation basis for the full-spectrum lamp 14, so that the light of the full-spectrum lamp 14 can irradiate the material. The data lines of the various sensors and the vacuumizing pipeline can also enter the drying cylinder 1 along the inside of the support shaft 6.

[0066] Based on the above scheme, a production line of the star anise vacuum negative pressure drying equipment is also disclosed here. As shown in Figure 8 , one side of the support 7 is provided with a material lifting equipment 20, and the discharge port of the material lifting equipment 20 is located directly above the drying cylinder 1 and can correspond to the material port of the drying cylinder 1. A material conveying belt 21 is arranged below the drying cylinder 1. A baffle 18 for guiding the discharge is arranged on the support 7 along the axial direction of the lower end of the drying cylinder 1, so as to prevent the dried star anise from scattering when being discharged through the discharge port. The above scheme can realize automatic feeding and discharging operations.

[0067] In combination with the above technical solutions, the intelligent vacuum negative pressure star anise drying and star anise hydrol and star anise oil production are realized, and multiple products such as dried star anise, star anise hydrol and star anise oil are obtained at one time. Here, in order to better realize suction vacuum, the vacuum negative pressure generating device 2 can be provided with a first vacuum pump and a second vacuum pump; similarly, the condensing system 3 can be provided with a first-stage condensing system and a second-stage condensing system, so as to better control the temperature to improve the hydrol collection rate and prevent water vapor in the terminal pipeline from entering the vacuum negative pressure generating device 2. The vacuum effect and process circulation are better provided.

[0068] Example 2:

[0069] The process method for obtaining high-quality dried star anise, star anise hydrol and star anise oil is further illustrated by the following application examples:

[0070] Taking 500 kg of fresh star anise entering the cylinder as an example, the ambient temperature is 29℃, the preset temperature in the cylinder is 50℃, the preset vacuum degree is-90kPa, and the star anise is dried to a moisture content of less than 10%, that is, the star anise drying value.

[0071] The star anise vacuum drying equipment described in the application examples has the following process method:

[0072] First, prepare the fresh star anise before drying: including screening, removing impurities, washing, air drying, etc.

[0073] ①Open the door 10, pour the air-dried fresh star anise into the drying cylinder 1 through the material port, close the door 10, and control the opening of the full-spectrum lamp 14 and the start of the driving device 8 through the control box 9 to rotate the drying cylinder 1.

[0074] ②Start the electromagnetic heating coil 11 to heat the temperature in the drying cylinder 1 to the preset temperature of 50℃ and dynamically maintain at this temperature;

[0075] ③Start the first vacuum pump of the vacuum negative pressure generating device 2 while heating to adjust the vacuum degree in the drying cylinder 1 to the preset value of-90kPa and maintain for 10 minutes, and stop the first vacuum pump;

[0076] ④After the water in the star anise in the drying cylinder 1 is naturally evaporated, the second vacuum pump of the vacuum negative pressure generating device 2 is started when the negative pressure reaches-30kPa;

[0077] ⑤Cyclically repeat the operations of ③-④, and the cycle time reaches the preset star anise drying value of less than 10%(moisture content of star anise);

[0078] ⑥Stop heating, start the vacuum negative pressure generating device 2, and discharge after 6 hours of presetting;

[0079] ⑦After reaching the preset time, close the vacuum negative pressure generating device 2 and release the pressure of the drying cylinder 1;

[0080] ⑧Take dry star anise from the material port, take star anise hydrol and star anise oil from the hydrol collecting device 4, and sort and pack to obtain products.

[0081] The drying results are shown in the following table:

[0082] Material name: fresh star anise Parameters Pre-set temperature in the cylinder 50℃ Pre-set vacuum degree in the cylinder -90 kPa Pre-set humidity in the cylinder (star anise moisture content, dry and wet percentage) Less than 10% Fresh star anise weight 500 kg Whether to kill green No Injection gas No injection gas Dry star anise weight 125 kg Collection of pure distillate and oil weight 292 kg Total drying time 61 hours Total power consumption 280 kW·h Star anise dry color Red-brown Star anise pure distillate color Pure and transparent Star anise oil color Pure and transparent

[0083] Example 3:

[0084] As Figure 7 shown, this embodiment is based on example 1, and a nitrogen generator 19 is added, the drying cylinder 1 is connected with the nitrogen generator 19, and an electromagnetic switch valve is arranged between the drying cylinder 1 and the nitrogen generator 19, and the nitrogen generator 19 is used to input nitrogen into the drying cylinder 1.

[0085] The following application example 3 further illustrates the process method for obtaining high-quality dry star anise, star anise hydrol and star anise oil:

[0086] Taking 500 kg of fresh star anise into the cylinder as an example, the ambient temperature is 29℃, the preset temperature in the cylinder is 60℃, the preset vacuum degree is-85kPa, and the star anise is dried to a moisture content of less than 10%, that is, the star anise drying value.

[0087] The star anise vacuum drying equipment described in the application example has the following process method:

[0088] First, prepare the fresh star anise before drying: including screening, removing impurities, washing, and air drying.

[0089] ①Open the door 10, pour the air-dried fresh star anise into the drying cylinder 1 through the material port, close the door 10, and at the same time, control the opening of the full-spectrum lamp 14 and the start of the driving device 8 through the control box 9, and rotate the drying cylinder 1.

[0090] ②Start the electromagnetic heating coil 11 to heat the temperature in the drying cylinder 1 to the preset temperature of 60℃ and dynamically keep it at this temperature;

[0091] ③At the same time of starting heating, start the first vacuum pump of the vacuum negative pressure generating device 2 to adjust the vacuum degree in the drying cylinder 1 to the preset value of-85kPa, and keep it for 10 minutes, and stop the first vacuum pump;

[0092] ④Inject nitrogen into the drying cylinder 1 until the negative pressure reaches-30kPa, stop the nitrogen injection, and stay for 5 minutes, and at the same time, change to start the second vacuum pump of the vacuum negative pressure generating device 2;

[0093] ⑤Cyclically repeat the operations of ③-④, and the cycle time reaches the preset star anise drying value of less than 10%(moisture content of star anise);

[0094] ⑥ Stop heating, turn on vacuum negative pressure generating device 2, and discharge the material after a preset 6 hours;

[0095] ⑦ After the preset time is reached, turn off the vacuum negative pressure generating device 2 and depressurize the drying cylinder 1;

[0096] ⑧ Remove the dried star anise from the material outlet, take out the star anise hydrosol and star anise oil from the hydrosol collection device 4, sort and package them to obtain the product.

[0097] The drying results are shown in the table below:

[0098]

[0099]

[0100] Based on the above-mentioned equipment, methods and production lines, the dried star anise produced does not require blanching or the addition of any other substances, such as sulfur, and can still retain the original quality of dried star anise and maintain the ideal color (such as reddish-brown) of natural sun-drying; the star anise hydrosol and star anise oil produced using the drying equipment and methods of this invention are pure and transparent with a mild aroma.

[0101] like Figure 9 The image shows a comparison of dried star anise obtained using traditional drying methods and the process described in this invention. Both images were taken at the same location under the same lighting conditions. Star anise A in the image was obtained using the traditional drying method, which involves boiling to kill the green color and then sun-drying. Star anise B in the image was obtained using the process described in this invention. It is evident that the dried star anise obtained by this invention is plump and has a distinct reddish-brown color, consistent with the color of dried star anise obtained by boiling to kill the green color and then sun-drying. Furthermore, the seeds of the dried star anise are relatively intact and have not fallen from the petals. This invention overcomes the technical problem that fresh star anise requires boiling to kill the green color or the addition of other substances to obtain reddish-brown dried star anise.

[0102] like Figure 10 The image shows a comparison between existing star anise oil and star anise oil obtained by the process of this invention. The images were taken at the same location under the same lighting conditions. Star anise oil C in the image is a common brand of star anise oil purchased from the market; star anise oil D in the image is obtained by the process of this invention, without further processing. It is easy to see that the star anise oil obtained by this invention is clearer than the commonly available star anise oil, which is yellow. This demonstrates that the star anise oil obtained by the process of this invention is of superior quality and is significantly better than existing processes.

[0103] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the patent application of the present invention. All equivalent changes, substitutions or modifications made within the technical spirit and principles indicated by the present invention should be included within the scope of patent protection covered by the present invention.

Claims

1. A star-shaped vacuum negative pressure drying device, comprising a drying cylinder (1), a vacuum negative pressure generating device (2), a condensing system (3), a hydrol distillate collecting device (4), and being communicated with each other through a vacuum pipeline (5); characterized in that: The drying cylinder (1) is rotatably arranged on the support (7) through the supporting shaft (6) and is connected with the driving device (8) on the support (7), and the control box (9) is further arranged on the support (7); the side of the drying cylinder (1) is provided with a material port for feeding and discharging materials and a bin door (10) for opening and closing the material port; the outer cylinder wall of the drying cylinder (1) is provided with an electromagnetic heating coil (11) and is wrapped with a heat preservation layer (12); the inner wall of the drying cylinder (1) is provided with a raking plate (13); a full-spectrum lamp (14) is arranged in the drying cylinder, and the inner wall surface of the drying cylinder (1) is a high-reflection surface layer. The drying method comprises: ① opening the bin door (10), pouring the fresh star anise cleaned and dried into the material port; closing the bin door (10), and simultaneously controlling the full-spectrum lamp (14) and the driving device (8) to be turned on through the control box (9); ② starting the electromagnetic heating coil (11) to heat, heating the temperature in the drying cylinder (1) to a preset temperature, and dynamically maintaining the temperature; ③ while starting the heating, starting the vacuum negative pressure generating device (2), adjusting the vacuum degree in the drying cylinder (1) to a preset value, and maintaining a certain time according to the amount of the material after reaching the preset value, and stopping the vacuum negative pressure generating device (2); ④ after the moisture of the star anise in the drying cylinder (1) is naturally evaporated, and the negative pressure in the drying cylinder (1) reaches the preset value, starting the vacuum negative pressure generating device; ⑤ repeating the steps ③-④ until the preset star anise drying value is reached; ⑥ stopping the heating before discharging the material, starting the vacuum negative pressure generating device (2), and setting the drying time of 1 to 10 hours according to the amount of the material; ⑦ after reaching the preset drying time, closing the vacuum negative pressure generating device (2), and releasing the pressure of the drying cylinder (1); ⑧ obtaining the dried star anise, star anise hydrol and star anise oil, sorting and packaging.

2. The octagonal vacuum negative pressure drying apparatus according to claim 1, characterized in that: An automatic push-pull mechanism (15) for opening and closing the bin door (10) is arranged between the bin door (10) and the drying cylinder (1).

3. The octagonal vacuum negative pressure drying apparatus according to claim 1, characterized in that: A plurality of annular support frames (16) are arranged on the inner wall of the drying cylinder (1) in the axial direction.

4. The octagonal vacuum negative pressure drying apparatus according to claim 1, characterized in that: The raking plate (13) is arranged on the inner wall of the drying cylinder (1) in the axial direction, and the raking plate (13) is designed as an inverted V-shaped structure, the larger end of the raking plate (13) is connected with the inner wall of the drying cylinder (1), and at least two raking plates (13) are arranged.

5. The octagonal vacuum negative pressure drying apparatus according to claim 1, characterized in that: The full-spectrum lamp (14) is arranged along the central axis direction of the inner cavity of the drying cylinder (1), the full-spectrum lamp (14) is a long strip-shaped lamp tube, and the two ends of the long strip-shaped lamp tube are respectively fixed with the drying cylinder (1).

6. The octagonal vacuum negative pressure drying apparatus according to claim 1, characterized in that: A lampshade (17) for protecting the lamp tube is arranged at the full-spectrum lamp (14), and the lampshade (17) is made of a material that does not absorb spectrum.

7. The octagonal vacuum negative pressure drying apparatus according to claim 1, characterized in that: Symmetrical baffle plates (18) for guiding the discharge of materials are arranged on the support (7) in the axial direction of the lower end of the drying cylinder (1).

8. The octagonal vacuum negative pressure drying apparatus according to any one of claims 1-7, characterized in that: A nitrogen generator (19) is further arranged, and the drying cylinder (1) is connected with the nitrogen generator (19) to realize the input of nitrogen into the drying cylinder (1).

9. A drying method of the star anise vacuum negative pressure drying equipment according to claim 8, characterized in that: ①Open the door (10), pour the fresh star anise which is cleaned and dried into the material port, close the door (10), and control the opening of the full spectrum lamp (14) and the driving device (8) through the control box (9); ②Start the electromagnetic heating coil (11) to heat, heat the temperature in the drying cylinder (1) to the preset temperature, and dynamically maintain; ③At the same time of starting heating, start the vacuum negative pressure generating device (2), adjust the vacuum degree in the drying cylinder (1) to the preset value, and keep for a certain time according to the more and less of the material after reaching the preset value, stop the vacuum negative pressure generating device (2); ④Inject nitrogen into the drying cylinder (1) to the preset value, stop the nitrogen injection, and keep for a certain time according to the more and less of the material after reaching the preset value, start the vacuum negative pressure generating device (2); ⑤Cyclically operate steps ③-④ until the preset star anise drying value is reached; ⑥Stop heating before discharging, open the vacuum negative pressure generating device (2), and set the drying time of 1-10 hours according to the more and less of the material; ⑦After reaching the preset drying time, close the vacuum negative pressure generating device (2), and release the pressure of the drying cylinder (1); ⑧Obtain dry star anise, star anise hydrol and star anise oil, sort and pack.

10. A production line using the star-shaped vacuum negative pressure drying apparatus according to any one of claims 1 to 8, characterized in that: The material lifting equipment (20) and the material conveying belt (21) are included, the material lifting equipment (20) is arranged on one side of the support (7), the discharge port of the material lifting is located directly above the drying cylinder (1) and can correspond to the material port of the drying cylinder, and the drying cylinder (1) is arranged above the material conveying belt (21) through the support (7).

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