Stevia rebaudiana residue secondary separation and purification equipment and process

Abstract

The invention relates to the technical field of separation, in particular to stevia rebaudiana residue secondary separation and purification equipment and process, the stevia rebaudiana residue secondary separation and purification equipment comprises a bottom plate, a rack and the like, the top of the bottom plate is connected with the rack, and the rack is connected with a box body. Stevia rebaudiana residues can be adsorbed and purified through activated carbon and ion exchange resin, the activated carbon and the ion exchange resin can be driven to rotate through a rack, the activated carbon and the ion exchange resin are automatically replaced, the operation cost and the time cost are reduced, and therefore the working efficiency is improved; solid-liquid separation can be carried out on atomized stevioside through the first cyclone separator and the second cyclone separator, dried stevioside powder is smaller in size and convenient to package and transport, the logistics cost can be reduced, the moisture content of the dried stevioside powder is low, growth of microorganisms can be inhibited, and the stevioside powder can be used as a solid-liquid separation agent. And the shelf life of the dried stevioside powder is prolonged.

Description

Technical Field

[0001] The present invention relates to the field of separation technology, and particularly to a device and process for secondary separation and purification of stevia residues. Background Art

[0002] Stevia is a natural sweetener plant, and its leaves contain various compounds with high sweetness and low calorie characteristics, especially steviol glycosides. In the industrial production process, a large amount of stevia residues will be left after preliminary extraction. These residues not only contain residual steviol glycosides, but may also contain impurities such as cellulose, protein, and pigment. In order to maximize the utilization of resources and reduce environmental pollution, it is necessary to further perform solid-liquid separation and purification on stevia residues.

[0003] In the industrial production process, activated carbon and ion exchange resins are commonly used adsorbents and separation media. Activated carbon can remove colors, odors, and other non-target components, and ion exchange resins can remove metal ions and other charged impurities to complete the purification of stevia residues. The adsorption or ion exchange capacity of activated carbon and ion exchange resins will gradually become saturated or ineffective with use and need to be replaced in a timely manner. Manually and frequently replacing activated carbon and ion exchange resins will increase the operation cost and time cost, affecting work efficiency. The purified stevia residues are in a liquid state, and the shelf life of liquid products is relatively short. They are particularly prone to deterioration in high-temperature or humid environments. Moreover, the volume of liquid products is large, which is not convenient for packaging and transportation, and will increase the logistics cost. Summary of the Invention

[0004] In view of this, the present invention provides a device and process for secondary separation and purification of stevia residues, which can overcome the disadvantages that manually and frequently replacing activated carbon and ion exchange resins will increase the operation cost and time cost, affecting work efficiency, the purified stevia residues are in a liquid state, the shelf life of liquid products is relatively short, they are particularly prone to deterioration in high-temperature or humid environments, and the volume of liquid products is large, which is not convenient for packaging and transportation, and will increase the logistics cost.

[0005] The technical solution is as follows: A secondary separation and purification device for stevia residue, comprising a bottom plate, a frame, a box body, a feed box, a feed pipe, an aggregation box, a discharge pipe, a filter screen, a rotating shaft, a rotating plate, a mounting pipe, activated carbon, ion exchange resin, an extrusion mechanism, a replacement mechanism and a separation mechanism. The top of the bottom plate is connected to the frame, the frame is connected to the box body, the box body is communicated with the feed box, and the stevia residue falls into the box body through the feed box. The feed box is communicated with the feed pipe, the bottom of the box body is communicated with the aggregation box, the bottom of the aggregation box is communicated with the discharge pipe, a filter screen is connected inside the aggregation box, the rotating shaft is rotatably connected to the bottom of the aggregation box, the rotating plate is connected to the rotating shaft, and the mounting pipes are circumferentially and evenly spaced on the rotating plate. The activated carbon and ion exchange resin are installed in the mounting pipes. The extrusion mechanism is used to extrude the stevia residue in the box body for preliminary solid-liquid separation to obtain a liquid phase containing stevioside. The liquid stevioside falls into the mounting pipes through the aggregation box and the discharge pipe. The activated carbon and ion exchange resin adsorb and purify the liquid stevioside. The replacement mechanism is used to replace the activated carbon and ion exchange resin. The separation mechanism is used to further separate the solid and liquid of the liquid stevioside.

[0006] As a further preferred solution, the extrusion mechanism includes a lead screw motor, a slider, a connecting frame, a pressing plate, a baffle and a first spring. The lead screw motor is installed inside the frame, the slider is slidably connected inside the frame, the lead screw of the lead screw motor is threadedly connected to the slider, the connecting frame is connected to the top of the slider, the pressing plate is connected to the connecting frame, and the pressing plate is used to extrude the stevia residue in the box body for preliminary solid-liquid separation. The baffle for blocking the stevia residue in the box body is slidably connected to the aggregation box, and the first spring is connected between the baffle and the aggregation box.

[0007] As a further preferred solution, the replacement mechanism includes an electric push rod, a push plate, a rack and a gear. The electric push rod is connected to the frame, the push plate is connected to the telescopic rod of the electric push rod, and the push plate is used to push the baffle to move to the right so that the baffle no longer blocks the liquid stevioside in the box body. The baffle is connected to the rack, the gear is connected to the rotating shaft through a one-way clutch, the rack will engage with the gear during the leftward movement and drive the gear to rotate, the gear drives the rotating shaft to rotate, and the rotating shaft drives the activated carbon and ion exchange resin to rotate to replace the activated carbon and ion exchange resin.

[0008] As a further preferred solution, the separation mechanism includes a mounting frame, a large tank body, a small tank body, an electric atomizing nozzle, a hot air blower, a hot air pipe, a pipe I, a cyclone separator I, a pipe II, a cyclone separator II, an exhaust pipe I, an exhaust pipe II and a support frame. The mounting frame is connected to the frame, the large tank body is connected to the mounting frame, the small tank body is connected to the top of the large tank body, the electric atomizing nozzle is installed at the bottom of the small tank body, and the electric atomizing nozzle is located inside the large tank body. The hot air blower is installed at the top of the mounting frame, the hot air pipe is connected to the hot air blower, and the hot air pipe is connected and communicated with the small tank body. The bottom of the large tank body is communicated with the pipe I, the cyclone separator I is installed at the top of the pipe I, the pipe II is communicated with the cyclone separator I, the pipe II penetrates through the large tank body in a sealed manner, the cyclone separator II is installed on the pipe I, the top of the cyclone separator II and the top of the cyclone separator I are jointly communicated with the exhaust pipe I, the top of the exhaust pipe I is connected to the exhaust pipe II, the support frame for supporting the pipe I and the exhaust pipe I is connected to the top of the bottom plate, and both the pipe I and the exhaust pipe I are connected to the support frame.

[0009] As a further preferred solution, it further includes a sealing pipe, a guide block, a guide rod and a spring II. Sealing pipes are slidably connected to one ends of the discharge pipe and the small tank body close to each other, and the two sealing pipes are respectively in contact with the upper and lower ends of the installation pipe to seal the gap between the discharge pipe, the small tank body and the installation pipe. Four guide blocks are connected to both the discharge pipe and the small tank body, guide rods are slidably connected inside the guide blocks, the guide rods are connected to the sealing pipes, and the spring II is connected between the sealing pipes and the guide blocks.

[0010] As a further preferred solution, it further includes a heater, and the heater is installed on the box body.

[0011] As a further preferred solution, it further includes a dust-proof cover, and the dust-proof cover is hinged to the top of the feed box.

[0012] The present invention also provides a separation and purification process for a stevia residue secondary separation and purification device, including the following steps: S1: Pour the stevia residue into the box body through the feed box, pour the solvent into the box body through the feed pipe, and the baffle blocks the stevia residue and the solvent in the box body; S2: Control the lead screw motor to drive the pressing plate to move downward, the pressing plate will enter the box body, and press the stevia residue in the box body to perform preliminary solid-liquid separation to obtain a liquid phase containing stevioside; S3: The liquid stevioside will fall into the installation pipe through the aggregation box and the discharge pipe. The activated carbon can remove colors, odors and other non-target components, and the ion exchange resin can remove metal ions and other charged impurities to complete the purification of the stevia residue; S4: Control the telescopic rod of the electric push rod to shorten, drive the rack to move leftward, the rack drives the gear to rotate, and the gear drives the activated carbon and the ion exchange resin to rotate to replace the activated carbon and the ion exchange resin; S5: The purified liquid stevioside will fall into the small tank body. The hot air blower injects hot air into the small tank body through the hot air pipe. The hot air serves as the drying medium and heats the purified liquid stevioside to the required temperature. The electric atomizing nozzle atomizes the purified liquid stevioside, causing the atomized stevioside to disperse in the hot air stream. S6: Cyclone separator one and cyclone separator two perform solid-liquid separation on the atomized stevioside. The dried stevioside powder will be discharged from the bottom of cyclone separator two, and the air is discharged through exhaust pipe one and exhaust pipe two.

[0013] The present invention has the following advantages: 1. In the present invention, activated carbon and ion exchange resin can be used to adsorb and purify the stevia residue. The rack can drive the activated carbon and ion exchange resin to rotate, automatically replacing the activated carbon and ion exchange resin, reducing the operation cost and time cost, thereby improving work efficiency. Cyclone separator one and cyclone separator two can perform solid-liquid separation on the atomized stevioside. The volume of the dried stevioside powder is smaller, which is convenient for packaging and transportation, can reduce the logistics cost, and the water content of the dried stevioside powder is low, which can inhibit the growth of microorganisms and extend the shelf life of the dried stevioside powder.

[0014] 2. The sealing pipe can seal the gaps between the discharge pipe, the small tank body and the installation pipe, preventing the liquid stevioside from flowing outside the installation pipe and also preventing the liquid stevioside from flowing outside the small tank body. Description of the Drawings

[0015] Figure 1 Shows the three-dimensional structure schematic diagram of the present invention.

[0016] Figure 2 Shows the three-dimensional structure schematic diagram of the box body, the feed box, the feed pipe and the aggregation box of the present invention.

[0017] Figure 3 Shows the three-dimensional structure schematic diagram of the discharge pipe, the filter screen, the rotating plate and the installation pipe of the present invention.

[0018] Figure 4 Shows the three-dimensional structure schematic diagram of the rotating shaft, the rotating plate and the installation pipe of the present invention.

[0019] Figure 5 Shows the cross-sectional view of the installation pipe of the present invention.

[0020] Figure 6 Shows the three-dimensional structure schematic diagram of the extrusion mechanism of the present invention.

[0021] Figure 7 Shows the cross-sectional view of the frame of the present invention.

[0022] Figure 8 Shows a three-dimensional structural schematic diagram of the baffle and spring one of the present invention.

[0023] Figure 9 Shows a first three-dimensional structural schematic diagram of the replacement mechanism of the present invention.

[0024] Figure 10 Shows a second three-dimensional structural schematic diagram of the replacement mechanism of the present invention.

[0025] Figure 11 Shows a first three-dimensional structural schematic diagram of the separation mechanism of the present invention.

[0026] Figure 12 Shows a second three-dimensional structural schematic diagram of the separation mechanism of the present invention.

[0027] Figure 13 Shows a three-dimensional structural schematic diagram of the small tank body and the electric atomizing nozzle of the present invention.

[0028] Figure 14 Shows a three-dimensional structural schematic diagram of the second pipeline, the first exhaust pipe and the second exhaust pipe of the present invention.

[0029] Figure 15 Shows a three-dimensional structural schematic diagram of the sealing pipe and the guide block of the present invention.

[0030] Figure 16 Shows a three-dimensional structural schematic diagram of the sealing pipe, the guide block, the guide rod and the second spring of the present invention.

[0031] Wherein: 1-bottom plate, 2-frame, 3-box body, 4-feed box, 5-feed pipe, 6-aggregation box, 7-discharge pipe, 8-filter screen, 9-rotating shaft, 10-rotating plate, 11-installation pipe, 12-activated carbon, 13-ion exchange resin, 141-screw motor, 142-slider, 143-connecting frame, 144-pressure plate, 145-baffle, 146-first spring, 151-electric push rod, 152-push plate, 153-rack, 154-gear, 161-mounting bracket, 162-large tank body, 163-small tank body, 164-electric atomizing nozzle, 165-hot air blower, 166-hot air pipe, 167-first pipeline, 168-first cyclone separator, 169-second pipeline, 1610-second cyclone separator, 1611-first exhaust pipe, 1612-second exhaust pipe, 1613-support frame, 171-sealing pipe, 172-guide block, 173-guide rod, 174-second spring, 18-heater, 19-dust-proof cover. Detailed implementation manners

[0032] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the 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. Therefore, it should not be construed as a limitation to the present invention.

[0033] In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. The technical solutions of the present invention will be clearly and completely described below with reference to the drawings. It should be noted that the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0034] Refer to Figures 1-14 , a secondary separation and purification device for stevia residue, comprising a bottom plate 1, a frame 2, a box body 3, a feed box 4, a feed pipe 5, an aggregation box 6, a discharge pipe 7, a filter screen 8, a rotating shaft 9, a rotating plate 10, a mounting pipe 11, activated carbon 12, ion exchange resin 13, an extrusion mechanism, a replacement mechanism and a separation mechanism. The rear side of the top of the bottom plate 1 is bolted with the frame 2. The middle part of the front side of the frame 2 is bolted with the box body 3. The upper right part of the box body 3 is communicated with the feed box 4. The feed box 4 is inclined so that the stevia residue can better fall into the box body 3 along the feed box 4. The upper part of the front side of the feed box 4 is communicated with the feed pipe 5. The bottom of the box body 3 is communicated with the aggregation box 6. The middle of the bottom of the aggregation box 6 is communicated with the discharge pipe 7. The upper part of the inside of the aggregation box 6 is connected with the filter screen 8. The rear side of the bottom of the aggregation box 6 is rotatably connected with the rotating shaft 9. The lower end of the rotating shaft 9 is connected with the rotating plate 10. Four mounting pipes 11 are circumferentially and evenly spaced on the rotating plate 10. All four mounting pipes 11 can rotate to directly below the discharge pipe 7. The upper part of the inside of the mounting pipe 11 is installed with the activated carbon 12, and the lower part of the inside of the mounting pipe 11 is installed with the ion exchange resin 13. The extrusion mechanism is used to extrude the stevia residue in the box body 3 for preliminary solid-liquid separation to obtain the liquid phase containing stevioside. The liquid stevioside falls into the mounting pipe 11 through the aggregation box 6 and the discharge pipe 7. The activated carbon 12 and the ion exchange resin 13 adsorb and purify the liquid stevioside. The replacement mechanism is used to replace the activated carbon 12 and the ion exchange resin 13. The separation mechanism is used to further separate the solid and liquid of the liquid stevioside.

[0035] Refer to Figures 6-8, the extrusion mechanism includes a lead screw motor 141, a slider 142, a connecting frame 143, a pressing plate 144, a baffle 145 and a first spring 146. The lead screw motor 141 is installed inside the frame 2, the slider 142 is slidably connected inside the frame 2, the lead screw of the lead screw motor 141 is threadedly connected to the slider 142, the top of the slider 142 is bolted to the connecting frame 143, the bottom of the connecting frame 143 is bolted to the pressing plate 144, the upper part of the aggregation box 6 is slidably connected to the baffle 145, and two first springs 146 are connected between the baffle 145 and the aggregation box 6.

[0036] Refer to Figure 9 and Figure 10 , the replacement mechanism includes an electric push rod 151, a push plate 152, a rack 153 and a gear 154. The electric push rod 151 is bolted to the middle of the front side of the frame 2. The electric push rod 151 is located at the rear side of the box body 3. The right end of the telescopic rod of the electric push rod 151 is connected to the push plate 152. The bottom of the baffle 145 is bolted to the rack 153. The upper part of the rotating shaft 9 is connected to the gear 154 through a one-way clutch. The rack 153 will mesh with the gear 154 during the leftward movement.

[0037] Refer to Figures 11-14, the separation mechanism includes a mounting frame 161, a large tank body 162, a small tank body 163, an electric atomizing nozzle 164, a hot air blower 165, a hot air duct 166, a first pipeline 167, a first cyclone separator 168, a second pipeline 169, a second cyclone separator 1610, a first exhaust pipe 1611, a second exhaust pipe 1612 and a support frame 1613. The lower part of the front side of the frame 2 is connected with the mounting frame 161 by bolts. The front part of the mounting frame 161 is connected with the large tank body 162. The top of the large tank body 162 is connected with the small tank body 163. All four mounting pipes 11 can rotate to the direct upper part of the small tank body 163. Five electric atomizing nozzles 164 are evenly installed at intervals in the circumferential direction at the bottom of the small tank body 163. All five electric atomizing nozzles 164 are located inside the large tank body 162. The rear side of the top of the mounting frame 161 is installed with the hot air blower 165 by bolts. The left side of the hot air blower 165 is connected with the hot air duct 166. The front end of the hot air duct 166 is connected with the rear side of the small tank body 163, and the hot air duct 166 is communicated with the small tank body 163. The bottom of the large tank body 162 is communicated with the first pipeline 167. The top of the first pipeline 167 is installed with the first cyclone separator 168. The left side of the first cyclone separator 168 is communicated with the second pipeline 169. The second pipeline 169 hermetically penetrates through the right side of the large tank body 162. The right end of the first pipeline 167 is installed with the second cyclone separator 1610. The top of the second cyclone separator 1610 and the top of the first cyclone separator 168 are jointly communicated with the first exhaust pipe 1611. The top of the first exhaust pipe 1611 is connected with the second exhaust pipe 1612. The top of the bottom plate 1 is connected with the support frame 1613 by bolts. Both the first pipeline 167 and the first exhaust pipe 1611 are connected with the support frame 1613. The support frame 1613 can support the first pipeline 167 and the first exhaust pipe 1611 to improve the stability of the first pipeline 167 and the first exhaust pipe 1611.

[0038] The staff pours the stevia residue into the box body 3 through the feed box 4, and then pours an organic or inorganic solvent (select a suitable organic or inorganic solvent according to the characteristics of the target product, such as ethanol, methanol, water, etc.) into the box body 3 through the feed pipe 5. The baffle 145 can block the stevia residue and the solvent in the box body 3. Then, control the lead screw motor 141 to drive the slider 142 to move downward. The slider 142 drives the connecting frame 143 to move downward, and the connecting frame 143 drives the pressing plate 144 to move downward. The pressing plate 144 will enter the box body 3 and extrude the stevia residue in the box body 3 to perform preliminary solid-liquid separation to obtain a liquid phase containing steviol glycosides. Subsequently, control the telescopic rod of the electric push rod 151 to extend, drive the push plate 152 to move to the right. The push plate 152 pushes the baffle 145 to move to the right, so that the baffle 145 no longer blocks the liquid steviol glycosides. The first spring 146 stretches, and the liquid steviol glycosides will pass through the filter screen 8 and fall into the aggregation box 6, and then fall into the installation pipe 11 through the aggregation box 6 and the discharge pipe 7. The activated carbon 12 can remove colors, odors, and other non-target components, and the ion exchange resin 13 can remove metal ions and other charged impurities to complete the purification of the stevia residue. Subsequently, control the telescopic rod of the electric push rod 151 to shorten, drive the push plate 152 to move to the left. The push plate 152 and the baffle 145 are disengaged. Under the action of the first spring 146, the baffle 145 moves to the left to reset. When it is necessary to replace the activated carbon 12 and the ion exchange resin 13, control the telescopic rod of the electric push rod 151 to shorten, drive the push plate 152 to move to the left. The push plate 152 drives the rack 153 to move to the left. During the leftward movement of the rack 153, it will engage with the gear 154 and drive the gear 154 to rotate. The gear 154 drives the rotating shaft 9 to rotate, the rotating shaft 9 drives the rotating plate 10 to rotate, the rotating plate 10 drives the installation pipe 11 to rotate, and the installation pipe 11 drives the activated carbon 12 and the ion exchange resin 13 to rotate, turning the old activated carbon 12 and ion exchange resin 13 away from directly below the discharge pipe 7 and turning the new activated carbon 12 and ion exchange resin 13 to directly below the discharge pipe 7 to automatically replace the activated carbon 12 and the ion exchange resin 13, which can reduce the operation cost and time cost, thereby improving work efficiency. The purified liquid steviol glycosides will fall into the small tank body 163. The hot air blower 165 injects hot air into the small tank body 163 through the hot air pipe 166. The hot air serves as a drying medium to heat the purified liquid steviol glycosides to the required temperature. The electric atomizing nozzle 164 atomizes the purified liquid steviol glycosides to disperse them in the hot air stream. The atomized steviol glycosides enter the first cyclone separator 168 through the second pipe 169. The first cyclone separator 168 performs solid-liquid separation on the atomized steviol glycosides. The dried steviol glycoside powder will fall into the first pipe 167, and the air is discharged through the first exhaust pipe 1611 and the second exhaust pipe 1612. The atomized steviol glycosides and the dried steviol glycoside powder will enter the second cyclone separator 1610 through the first pipe 167.The cyclone separator II 1610 separates the solid and liquid of the atomized stevioside. The dried stevioside powder will be discharged from the bottom of the cyclone separator II 1610, and the air will be discharged through the exhaust pipe I 1611 and the exhaust pipe II 1612. The dried stevioside powder has a smaller volume, which is convenient for packaging and transportation, can reduce the logistics cost, and the moisture content of the dried stevioside powder is low, which can inhibit the growth of microorganisms and extend the shelf life of the dried stevioside powder.

[0039] Refer to Figure 15 and Figure 16 It also includes a sealing pipe 171, a guide block 172, a guide rod 173 and a second spring 174. Sealing pipes 171 are slidably connected to one end of the discharge pipe 7 and the small tank body 163 that are close to each other. The two sealing pipes 171 are in contact with the upper and lower ends of the installation pipe 11 respectively. One side of the two sealing pipes 171 close to each other is conical. Four guide blocks 172 are evenly spaced and circumferentially connected to the outer circumferences of the discharge pipe 7 and the small tank body 163. Guide rods 173 are slidably connected inside the guide blocks 172. The guide rods 173 are connected to the sealing pipes 171. Second springs 174 are sleeved on the guide rods 173. The two ends of the second springs 174 are respectively connected to the sealing pipes 171 and the guide blocks 172. The second springs 174 are sleeved on the guide rods 173, which can prevent the second springs 174 from bending.

[0040] The two sealing pipes 171 are in contact with the upper and lower ends of the installation pipe 11 respectively, which can seal the gaps between the discharge pipe 7, the small tank body 163 and the installation pipe 11, prevent the liquid stevioside from flowing outside the installation pipe 11 and also prevent the liquid stevioside from flowing outside the small tank body 163. One side of the two sealing pipes 171 close to each other is conical, so when the installation pipe 11 rotates, it can push the sealing pipe 171, making the two sealing pipes 171 move away from each other, and the second spring 174 is compressed. When the installation pipe 11 and the sealing pipe 171 are disengaged, under the action of the second spring 174, the two sealing pipes 171 move towards each other. The next installation pipe 11 will contact the conical shape of the sealing pipe 171 and push the sealing pipe 171, making the two sealing pipes 171 move away from each other, and the second spring 174 is compressed. When the next installation pipe 11 corresponds to the sealing pipe 171, under the action of the second spring 174, the two sealing pipes 171 move towards each other, and the two sealing pipes 171 are in contact with the upper and lower ends of the installation pipe 11 respectively, sealing the gaps between the discharge pipe 7, the small tank body 163 and the installation pipe 11.

[0041] Refer to Figure 2 It also includes a heater 18. The heater 18 is installed on the left and right sides of the box body 3 through bolts. The heater 18 can heat the box body 3 to ensure the best extraction effect and can quickly extract in a short time at a higher temperature.

[0042] Reference Figure 2 It further includes a dust cover 19. The dust cover 19 is hinged to the top of the feed box 4, and the dust cover 19 can seal the top of the feed box 4 to prevent dust from falling into the feed box 4.

[0043] The present invention also provides a separation and purification process for a stevia residue secondary separation and purification device, including the following steps: S1: Pour the stevia residue into the box body 3 through the feed box 4, and pour the solvent into the box body 3 through the feed pipe 5. The baffle 145 blocks the stevia residue and the solvent in the box body 3; S2: Control the lead screw motor 141 to drive the pressing plate 144 to move downward. The pressing plate 144 will enter the box body 3 and squeeze the stevia residue in the box body 3 to perform preliminary solid-liquid separation to obtain a liquid phase containing steviol glycosides; S3: The liquid steviol glycosides will fall into the installation pipe 11 through the aggregation box 6 and the discharge pipe 7. The activated carbon 12 can remove colors, odors and other non-target components, and the ion exchange resin 13 can remove metal ions and other charged impurities to complete the purification of the stevia residue; S4: Control the telescopic rod of the electric push rod 151 to shorten, drive the rack 153 to move to the left. The rack 153 drives the gear 154 to rotate, and the gear 154 drives the activated carbon 12 and the ion exchange resin 13 to rotate to replace the activated carbon 12 and the ion exchange resin 13; S5: The purified liquid steviol glycosides will fall into the small tank body 163. The hot air blower 165 injects hot air into the small tank body 163 through the hot air pipe 166. The hot air is used as a drying medium to heat the purified liquid steviol glycosides to the required temperature. The electric atomizing nozzle 164 atomizes the purified liquid steviol glycosides so that the atomized steviol glycosides are dispersed in the hot air stream; S6: The cyclone separator one 168 and the cyclone separator two 1610 perform solid-liquid separation on the atomized steviol glycosides. The dried steviol glycoside powder will be discharged from the bottom of the cyclone separator two 1610, and the air is discharged through the exhaust pipe one 1611 and the exhaust pipe two 1612.

[0044] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. It only expresses the preferred embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be construed as a limitation on the scope of the present invention patent.

[0045] It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations, quantity increases or decreases, improvements and substitutions can be made. Therefore, based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative labor belong to the scope of protection of the present invention.

Claims

1. A secondary separation and purification device for stevia residue, comprising a bottom plate (1), a frame (2), a box body (3), a feed box (4), a feed pipe (5), an aggregation box (6), a discharge pipe (7) and a filter screen (8). The top of the bottom plate (1) is connected with the frame (2), the frame (2) is connected with the box body (3), the box body (3) is communicated with the feed box (4), the stevia residue falls into the box body (3) through the feed box (4), the feed box (4) is communicated with the feed pipe (5), the bottom of the box body (3) is communicated with the aggregation box (6), the bottom of the aggregation box (6) is communicated with the discharge pipe (7), and the filter screen (8) is connected inside the aggregation box (6). It is characterized in that, It also includes a rotating shaft (9), a rotating plate (10), a mounting pipe (11), activated carbon (12), ion exchange resin (13), an extrusion mechanism, a replacement mechanism and a separation mechanism. The bottom of the aggregation box (6) is rotatably connected to the rotating shaft (9), the rotating shaft (9) is connected with the rotating plate (10), the mounting pipes (11) are circumferentially and evenly spaced and connected to the rotating plate (10), the activated carbon (12) and the ion exchange resin (13) are installed in the mounting pipes (11), the extrusion mechanism is used for extruding the stevia residue in the box body (3) to perform preliminary solid-liquid separation to obtain the liquid phase containing stevioside, the liquid stevioside falls into the mounting pipes (11) through the aggregation box (6) and the discharge pipe (7), and the activated carbon (12) and the ion exchange resin (13) adsorb and purify the liquid stevioside. The replacement mechanism is used for replacing the activated carbon (12) and the ion exchange resin (13), and the separation mechanism is used for further solid-liquid separation of the liquid stevioside.

2. The secondary separation and purification equipment for stevia residue according to claim 1, characterized in that, The extrusion mechanism includes a lead screw motor (141), a slider (142), a connecting frame (143), a pressing plate (144), a baffle (145) and a first spring (146). The lead screw motor (141) is installed in the frame (2), the slider (142) is slidably connected in the frame (2), the lead screw of the lead screw motor (141) and the slider (142) are connected by threads, the top of the slider (142) is connected with the connecting frame (143), the connecting frame (143) is connected with the pressing plate (144), and the pressing plate (144) is used for extruding the stevia residue in the box body (3) to perform preliminary solid-liquid separation. The baffle (145) for blocking the stevia residue in the box body (3) is slidably connected to the aggregation box (6), and the first spring (146) is connected between the baffle (145) and the aggregation box (6).

3. The secondary separation and purification equipment for stevia residue according to claim 2, characterized in that, The replacement mechanism includes an electric push rod (151), a push plate (152), a rack (153) and a gear (154). The electric push rod (151) is connected to the frame (2), the push plate (152) is connected to the telescopic rod of the electric push rod (151), and the push plate (152) is used for pushing the baffle (145) to move to the right so that the baffle (145) no longer blocks the liquid stevioside in the box body (3). The baffle (145) is connected with the rack (153), the gear (154) is connected to the rotating shaft (9) through a one-way clutch. During the process of moving to the left, the rack (153) will engage with the gear (154) and drive the gear (154) to rotate. The gear (154) drives the rotating shaft (9) to rotate, and the rotating shaft (9) drives the activated carbon (12) and the ion exchange resin (13) to rotate to replace the activated carbon (12) and the ion exchange resin (13).

4. The secondary separation and purification equipment for stevia residue according to claim 3, characterized in that, The separation mechanism includes a mounting frame (161), a large tank body (162), a small tank body (163), an electric atomizing nozzle (164), a hot air blower (165), a hot air duct (166), a first pipeline (167), a first cyclone separator (168), a second pipeline (169), a second cyclone separator (1610), a first exhaust pipe (1611), a second exhaust pipe (1612) and a support frame (1613). A mounting frame (161) is connected to the frame (2), a large tank body (162) is connected to the mounting frame (161), a small tank body (163) is connected to the top of the large tank body (162), an electric atomizing nozzle (164) is installed at the bottom of the small tank body (163), the electric atomizing nozzle (164) is located inside the large tank body (162), a hot air blower (165) is installed at the top of the mounting frame (161), a hot air duct (166) is connected to the hot air blower (165), the hot air duct (166) is connected and communicated with the small tank body (163), the bottom of the large tank body (162) is communicated with a first pipeline (167), a first cyclone separator (168) is installed at the top of the first pipeline (167), a second pipeline (169) is communicated with the first cyclone separator (168), the second pipeline (169) penetrates through the large tank body (162) in a sealed manner, a second cyclone separator (1610) is installed on the first pipeline (167), a first exhaust pipe (1611) is jointly communicated with the top of the second cyclone separator (1610) and the top of the first cyclone separator (168), a second exhaust pipe (1612) is connected to the top of the first exhaust pipe (1611), a support frame (1613) for supporting the first pipeline (167) and the first exhaust pipe (1611) is connected to the top of the bottom plate (1), and both the first pipeline (167) and the first exhaust pipe (1611) are connected to the support frame (1613).

5. The secondary separation and purification equipment for stevia residue according to claim 4, characterized in that, It further includes a sealing pipe (171), a guide block (172), a guide rod (173) and a second spring (174). Sealing pipes (171) are slidably connected to the mutually approaching ends of the discharge pipe (7) and the small tank body (163), and the two sealing pipes (171) are respectively in contact with the upper and lower ends of the installation pipe (11) to seal the gaps between the discharge pipe (7), the small tank body (163) and the installation pipe (11). Four guide blocks (172) are connected to both the discharge pipe (7) and the small tank body (163), guide rods (173) are slidably connected inside the guide blocks (172), the guide rods (173) are connected to the sealing pipes (171), and a second spring (174) is connected between the sealing pipes (171) and the guide blocks (172).

6. The secondary separation and purification equipment for stevia residue according to claim 5, characterized in that, It further includes a heater (18), and the heater (18) is installed on the box body (3).

7. The secondary separation and purification equipment for stevia residue according to claim 6, characterized in that, It further includes a dust-proof cover (19), and the dust-proof cover (19) is hinged to the top of the feed box (4).

8. The separation and purification process of a stevia residue secondary separation and purification device as described in claim 4, characterized in that, It includes the following steps: S1: Pour the stevia residue into the box body (3) through the feed box (4), pour the solvent into the box body (3) through the feed pipe (5), and the baffle (145) blocks the stevia residue and the solvent in the box body (3). S2: Control the lead screw motor (141) to drive the pressure plate (144) to move downward. The pressure plate (144) will enter the box body (3), and extrude the stevia residue in the box body (3) to conduct preliminary solid-liquid separation to obtain the liquid phase containing steviol glycosides. S3: The liquid steviol glycosides will fall into the installation pipe (11) through the aggregation box (6) and the discharge pipe (7). The activated carbon (12) can remove colors, odors and other non-target components, and the ion exchange resin (13) can remove metal ions and other charged impurities to complete the purification of the stevia residue. S4: Control the telescopic rod of the electric push rod (151) to shorten, drive the rack (153) to move leftward. The rack (153) drives the gear (154) to rotate, and the gear (154) drives the activated carbon (12) and the ion exchange resin (13) to rotate to replace the activated carbon (12) and the ion exchange resin (13). S5: The purified liquid steviol glycosides will fall into the small tank body (163). The hot air blower (165) injects hot air into the small tank body (163) through the hot air pipe (166). The hot air is used as the drying medium to heat the purified liquid steviol glycosides to the required temperature. The electric atomizing nozzle (164) atomizes the purified liquid steviol glycosides so that the atomized steviol glycosides are dispersed in the hot air flow. S6: The cyclone separator one (168) and the cyclone separator two (1610) conduct solid-liquid separation on the atomized steviol glycosides. The dried steviol glycoside powder will be discharged from the bottom of the cyclone separator two (1610), and the air is discharged through the exhaust pipe one (1611) and the exhaust pipe two (1612).

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