A curcumin extraction device and an extraction method

Abstract

The present invention discloses a curcumin extraction device and an extraction method, belonging to the field of curcumin extraction; the device includes a cylinder body, a partition is fixedly connected to the middle of the cylinder body, the partition divides the cylinder body into a stirring cylinder and a distillation cylinder, a condenser tube is communicated with the distillation cylinder, a gear is fixedly connected to the valve rod of the reflux valve, and when the gear rotates, the condenser tube can be communicated with the collection cylinder or the reflux tube; when the solution in the distillation cylinder boils violently, the second water injection pipe injects low-temperature cooling water into the first water injection pipe, so as to increase the pressure in the control box, so that the gear rotates and the condenser tube is communicated with the reflux tube. The method includes stirring extraction, filtration and transfer, vacuum distillation, and boiling regulation; when the solution boils violently in the present invention, the reflux valve is reversed to make the condenser tube communicate with the reflux tube, so that when the solution boils violently, the curcumin entrained in the steam can flow back into the distillation cylinder through the reflux tube after condensation, reducing the loss of curcumin.

Description

Technical Field

[0001] The present invention relates to the technical field of curcumin extraction, and particularly to a curcumin extraction device and an extraction method. Background Art

[0002] In the field of curcumin extraction, the solvent extraction method has become the mainstream process due to its simple operation and strong applicability. This method first extracts curcumin from turmeric raw materials by utilizing its solubility in organic solvents, and then separates the solvent and curcumin through distillation operation. However, there are many problems to be solved urgently in the actual operation process of traditional extraction devices.

[0003] On the one hand, the phenomenon of solution boiling over frequently occurs during the distillation process. Once the solution boils over, a large amount of curcumin will enter the condensation system together with the solvent vapor and is finally collected in the solvent collection device. This not only causes serious loss of curcumin, reduces the extraction efficiency, but also dilutes the collected solvent, increasing the difficulty and cost of subsequent purification. Traditional devices usually lack an effective monitoring and response mechanism for the boiling over situation and cannot prevent the loss of curcumin with the vapor in time. Summary of the Invention

[0004] The purpose of the present invention is to provide a curcumin extraction device and an extraction method, which solve the problem that curcumin is easily carried out when the solution boils over.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A curcumin extraction device includes a cylinder body. A partition is fixedly connected to the middle of the cylinder body, and the partition divides the cylinder body into a stirring cylinder and a distillation cylinder. A condenser tube is connected to the distillation cylinder, a collection cylinder is connected to the condenser tube, a return pipe is connected between the condenser tube and the distillation cylinder, a return valve is arranged on the condenser tube, and a gear is fixedly connected to the valve rod of the return valve. When the gear rotates, the condenser tube can be connected to the collection cylinder or the return pipe;

[0006] A condenser cylinder is sleeved on the condenser tube. A water inlet pipe is connected to the condenser cylinder, and the end of the water inlet pipe is connected to a control box. A piston plate is slidably connected in the control box. A tension spring is connected between one side of the piston plate and the control box. A rack engaged with the gear is connected to the other side of the piston plate. A first water injection pipe is also connected to the control box, and a second water injection pipe is connected to the first water injection pipe. The first water injection pipe injects normal temperature cooling water into the condenser cylinder. When the solution in the distillation cylinder boils over, the second water injection pipe injects low temperature cooling water into the first water injection pipe, so that the pressure in the control box increases, causing the gear to rotate and the condenser tube to be connected to the return pipe.

[0007] Preferably, the reflux valve further includes a spherical valve housing, which is communicated with the condenser tube and the reflux tube. A spherical valve core is rotatably connected in the spherical valve housing, and the valve stem is fixedly connected to the spherical valve core. A T-shaped hole is formed in the middle of the spherical valve core. When the spherical valve core rotates, the T-shaped hole can be communicated with the collection cylinder or the reflux tube.

[0008] Preferably, a vacuum extraction tube is communicated with the collection cylinder, and a one-way valve is arranged on the vacuum extraction tube.

[0009] Preferably, a circular plate is slidably connected in the distillation cylinder, and the circular plate fits the inner wall of the distillation cylinder. A hydraulic rod is fixedly connected to the bottom wall of the distillation cylinder, and the output end of the hydraulic rod is fixedly connected to the lower surface of the circular plate. When the hydraulic rod extends, it can drive the circular plate to move upward, thereby reducing the distillation space of the distillation cylinder, so that the negative pressure degree of the distillation cylinder is reduced to relieve the boiling of the solution.

[0010] Preferably, a sliding seat is fixedly connected above the circular plate in the distillation cylinder. A detection rod is vertically slidably connected to the sliding seat. A hollow ball is fixedly connected to the bottom of the detection rod, and the hollow ball floats on the solution. A displacement sensor is arranged on the sliding seat. When the solution boils violently, the height difference of the hollow ball rising and falling on the surface of the solution increases, so that the stroke of the detection rod vertically reciprocatingly sliding on the sliding seat increases. At this time, the hydraulic rod extends, and when the hydraulic rod extends, the second water injection pipe injects low-temperature cooling water into the first water injection pipe.

[0011] Preferably, a stirring rod is rotatably connected in the stirring cylinder. A motor is vertically slidably connected to the top of the stirring cylinder, and a filter screen is vertically slidably connected to the bottom of the stirring cylinder. A conical plug is fixedly connected to the lower surface of the filter screen, and a conical hole matching the conical plug is formed in the partition plate. When the motor moves downward, it can drive the filter screen to move upward, so that the conical plug moves upward, so that the stirring cylinder is communicated with the distillation cylinder.

[0012] Preferably, the bottom end of the stirring rod is magnetically adsorbed and rotatably connected with a threaded rod. Two rectangular blocks are symmetrically slidably connected to the upper surface of the filter screen. Thread grooves matching the threaded rod are formed on the opposite surfaces of the two rectangular blocks. Wedge blocks are fixedly connected to the tops of the two rectangular blocks. The bottom end of the stirring rod is slidably connected with an inner conical ring through a spring key. When the inner conical ring moves downward with the stirring rod, it can push the two wedge blocks closer to each other, so that the thread grooves on the inner walls of the two rectangular blocks are both engaged with the threaded rod.

[0013] Preferably, two vertical plates are fixedly connected to the upper surface of the filter screen, and reset springs are fixedly connected between the two vertical plates and the two rectangular blocks;

[0014] A limiting block is fixedly connected to the side wall of the filter screen. A sliding groove matching with the limiting block is formed in the inner wall of the stirring cylinder, and an air spring is connected between the top wall of the sliding groove and the limiting block.

[0015] Preferably, a dredging rod is fixedly connected to the side wall of the inner conical ring. After the stirring rod and the filter screen approach each other, the dredging rod can be attached to the upper surface of the filter screen.

[0016] A curcumin extraction method, which is applied to a curcumin extraction device, includes the following steps:

[0017] Add the crushed raw materials and the solvent into the stirring cylinder, start the motor to make the stirring rod stir the raw materials, and heat the stirring cylinder at the same time to dissolve the curcumin in the raw materials in the solvent;

[0018] After the stirring and extraction are completed, control the motor to move downward. At this time, the stirring rod moves downward, so that the spring of the stirring rod drives the inner conical ring. At this time, the inner conical ring pushes the two wedge blocks closer to each other, so that the two rectangular blocks approach each other, so that the threaded rod can drive the filter screen to move upward when rotating with the stirring rod. When the filter screen moves upward, the wedge block pushes the inner conical ring to slide upward on the stirring rod against the elastic force of the spring. At this time, the dredging rod contacts the filter screen to scrape the filter screen, and the conical plug moves upward, so that the solvent for extracting curcumin flows into the distillation cylinder;

[0019] After the solvent for extracting curcumin flows into the distillation cylinder, control the motor to reverse, so that the filter screen moves downward, so that the conical plug seals the conical hole of the partition plate, so that the distillation cylinder is closed. After evacuating the collection cylinder and the distillation cylinder through the vacuum extraction pipe, heat the distillation cylinder, so that the temperature of the distillation cylinder slowly rises to the highest temperature required for extraction;

[0020] After the solvent evaporates, it is condensed by the condenser and enters the collection cylinder for collection. When the solution in the distillation cylinder boils violently, the stroke of the hollow ball floating up and down driven by the violently boiling solution increases, so that the stroke of the detection rod sliding vertically in the sliding seat increases. After the displacement sensor on the sliding seat obtains the vertical sliding stroke data of the detection rod, it transmits the data to the control system. The control system controls the hydraulic rod to extend, so that the circular plate moves upward, so that the total volume of the distillation cylinder and the collection cylinder decreases. At this time, the degree of negative pressure in the distillation cylinder decreases, thereby alleviating the violent boiling of the solution in the distillation cylinder;

[0021] While the control system controls the hydraulic rod to extend, it also controls the low-temperature cooling water to be injected into the first water injection pipe regularly and quantitatively through the second water injection pipe. At this time, the flow rate of the cold water increases, the condensation speed of the steam in the condenser increases, and at the same time, the pressure in the control box increases. At this time, the piston plate slides, so that the rack drives the gear to rotate, so that the condensate containing curcumin due to violent boiling flows back to the distillation cylinder through the condenser and the return pipe;

[0022] After the second water injection pipe stops injecting cold water into the first water injection pipe, the pressure inside the control box drops, and the pulling spring pulls the piston plate back to its original position, so that the condensation pipe resumes its connection with the collection cylinder and continues to collect the condensed solvent;

[0023] If the vertical sliding stroke of the detection rod is low, the control system controls the hydraulic rod to shorten to increase the vacuum degree inside the distillation cylinder.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] When the second water injection pipe injects cooling water in the present invention, the amount of cooling water injected into the space between the piston plate and the control box inside the control box through the first water injection pipe increases, so that the pressure inside the control box increases. At this time, the pressure pushes the piston plate to slide against the pulling force of the pulling spring, so that the piston plate drives the rack to slide. The rack slides and drives the gear to rotate, so that the reflux valve is reversed to connect the condensation pipe with the reflux pipe. When the solution boils violently, the curcumin wrapped in the steam can flow back into the distillation cylinder through the reflux pipe after condensation, reducing the loss of curcumin. Description of the Drawings

[0026] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 is a sectional view of the cylinder body of the present invention;

[0028] Figure 3 is a schematic diagram of the structure at the threaded rod of the present invention;

[0029] Figure 4 is a schematic diagram of the structure at the hollow ball of the present invention;

[0030] Figure 5 is a schematic diagram of the structure at the collection cylinder of the present invention;

[0031] Figure 6 is a schematic diagram of the structure at the control box of the present invention.

[0032] In the figure: 100, cylinder body; 110, partition board; 120, mixing drum; 130, motor; 131, base; 132, electric telescopic rod; 140, mixing rod; 150, inner conical ring; 151, dredging rod; 160, threaded rod; 170, filter screen; 171, vertical plate; 172, rectangular block; 173, return spring; 174, wedge block; 175, conical plug; 180, air spring; 181, limit block; 190, electric heating wire; 200, distillation cylinder; 210, round plate; 211, discharge pipe; 212, solenoid valve; 220, hydraulic rod; 230, sliding seat; 240, detection rod; 250, hollow ball; 300, collection cylinder; 310, condenser tube; 320, spherical valve housing; 321, spherical valve core; 322, T-shaped hole; 323, valve rod; 324, gear; 330, condensation cylinder; 340, water inlet pipe; 350, control box; 351, piston plate; 352, rack; 353, tension spring; 360, first water injection pipe; 370, second water injection pipe; 380, return pipe; 390, evacuation pipe. Detailed implementation mode

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] Refer to Figures 1-6, this embodiment provides a technical solution: a curcumin extraction device, including a cylinder body 100, a partition 110 is fixedly connected to the middle of the cylinder body 100, and the partition 110 divides the cylinder body 100 into a stirring cylinder 120 and a distillation cylinder 200. A condenser pipe 310 is connected to the distillation cylinder 200, a collection cylinder 300 is connected to the condenser pipe 310, and a reflux pipe 380 is connected between the condenser pipe 310 and the distillation cylinder 200. A reflux valve is provided on the condenser pipe 310, and a gear 324 is fixedly connected to the valve rod 323 of the reflux valve. When the gear 324 rotates, the condenser pipe 310 can be connected to the collection cylinder 300 or the reflux pipe 380; a condenser cylinder 330 is sleeved on the condenser pipe 310, a water inlet pipe 340 is connected to the condenser cylinder 330, the end of the water inlet pipe 340 is connected to a control box 350, a piston plate 351 is slidably connected in the control box 350, a tension spring 353 is connected between one side of the piston plate 351 and the control box 350, and a rack 352 engaged with the gear 324 is connected to the other side of the piston plate 351. A first water injection pipe 360 is also connected to the control box 350, a second water injection pipe 370 is connected to the first water injection pipe 360, the first water injection pipe 360 injects normal temperature cooling water into the condenser cylinder 330. When the solution in the distillation cylinder 200 boils violently, the second water injection pipe 370 injects low temperature cooling water into the first water injection pipe 360, so that the pressure in the control box 350 increases, causing the gear 324 to rotate and the condenser pipe 310 to be connected to the reflux pipe 380.

[0035] A feeding pipe (not shown in the figure) connected to the stirring cylinder 120 is connected to the cylinder body 100. Turmeric and other crushed raw materials for extracting curcumin are added to the stirring cylinder 120 through the feeding pipe, and then solvents such as ethanol are added. Electric heating wires 190 are provided inside the cylinder walls of both the stirring cylinder 120 and the distillation cylinder 200. The electric heating wires 190 are started to provide heat for the extraction of curcumin and subsequent distillation. After stirring the curcumin and the solvent in the stirring cylinder 120 for a period of time, the curcumin is dissolved in the solvent. At this time, the solution dissolving the curcumin is discharged into the distillation cylinder 200;

[0036] After evacuating the collection cylinder 300 and the distillation cylinder 200, the electric heating wire 190 provided inside the cylinder wall of the distillation cylinder 200 is started to heat the solution. The degree of vacuum in the collection cylinder 300 and the distillation cylinder 200 is not an absolute vacuum. The heating power of the electric heating wire 190 gradually increases until it is constant, so that the solution is gradually heated. After the power of the electric heating wire 190 becomes constant, the temperature of the solution remains the highest. The heating temperature here can be set at fifty degrees;

[0037] During the heating process of the solution, the solution gradually boils, causing the solvent to evaporate and separate from the solution. The solvent vapor (hereinafter referred to as vapor) is condensed into droplets after passing through the condenser tube 310 and collected by the collection cylinder 300. During the distillation process, if the solution boils violently, the second water injection tube 370 injects cooler cooling water into the first water injection tube 360; otherwise, it does not inject.

[0038] The cross-sectional shape of the inner cavity of the partition plate 110 is triangular, and the vertex of the triangle is located at the upper part. The end of the condenser tube 310 is connected to the vertex of the triangle, ensuring that the vapor converging at the vertex of the triangle can enter the condenser tube 310.

[0039] When the second water injection tube 370 injects cooling water, the amount of cooling water injected into the space between the piston plate 351 and the control box 350 in the control box 350 through the first water injection tube 360 increases, thereby increasing the pressure in the control box 350. At this time, the pressure pushes the piston plate 351 to slide against the tension of the tension spring 353. Thus, the piston plate 351 drives the rack 352 to slide, and the rack 352 slides and drives the gear 324 to rotate, so that the reflux valve is switched to connect the condenser tube 310 and the reflux tube 380. When the solution boils violently, the curcumin entrained in the vapor can flow back into the distillation cylinder 200 through the reflux tube 380 after condensation, reducing the loss of curcumin.

[0040] The connection point of the reflux tube 380 and the reflux valve is higher than the connection point of the reflux tube 380 and the distillation cylinder 200, ensuring that the condensate can flow back to the distillation cylinder 200 stably under the action of gravity.

[0041] Since a large amount of solvent is used when extracting curcumin, setting up the reflux tube 380 to recover the condensate entraining curcumin has a more streamlined structure and higher stability compared to controlling the inclination of the condenser tube 310 to make the condensate flow back.

[0042] The reflux valve further includes a spherical valve housing 320. The spherical valve housing 320 is connected to the condenser tube 310 and the reflux tube 380. A spherical valve core 321 is rotatably connected in the spherical valve housing 320. The valve rod 323 is fixedly connected to the spherical valve core 321. A T-shaped hole 322 is opened in the middle of the spherical valve core 321. When the spherical valve core 321 rotates, the T-shaped hole 322 can communicate with the collection cylinder 300 or the reflux tube 380.

[0043] The axis of the valve stem 323 is perpendicular to the axes of both the horizontal and vertical sections of the T-shaped hole 322. When the gear 324 rotates, it can drive the spherical valve core 321 to rotate synchronously, changing the connection state of the T-shaped hole 322. When the solution boils violently, the spherical valve core 321 rotates towards the reflux pipe 380, causing the condenser pipe 310 to communicate with the reflux pipe 380 and interrupting the connection between the condenser pipe 310 and the collection cylinder 300. After a period of time when the violent boiling stabilizes, the spherical valve core 321 rotates in the reverse direction to reset, making the condenser pipe 310 communicate with the collection cylinder 300 and interrupting the connection between the condenser pipe 310 and the reflux pipe 380. At this time, the condenser pipe 310 continues to discharge the condensed solvent into the collection cylinder 300.

[0044] A vacuum extraction pipe 390 is connected to the collection cylinder 300, and a one-way valve is provided on the vacuum extraction pipe 390.

[0045] The vacuum extraction pipe 390 is connected to an external vacuum pump. When the external vacuum pump operates to make the collection cylinder 300 and the distillation cylinder 200 reach the required vacuum degree, it stops operating. The one-way valve on the vacuum extraction pipe 390 can prevent the distillation cylinder 200 and the collection cylinder 300 from relieving pressure.

[0046] A circular plate 210 is slidably connected inside the distillation cylinder 200. The circular plate 210 fits against the inner wall of the distillation cylinder 200. The bottom wall of the distillation cylinder 200 is fixedly connected to a hydraulic rod 220. The output end of the hydraulic rod 220 is fixedly connected to the lower surface of the circular plate 210. When the hydraulic rod 220 extends, it can drive the circular plate 210 to move upward, thereby reducing the distillation space in the distillation cylinder 200, so as to reduce the degree of negative pressure in the distillation cylinder 200 and relieve the violent boiling of the solution.

[0047] The space between the circular plate 210 and the top wall of the distillation cylinder 200 remains relatively airtight during distillation and is only connected to the collection cylinder 300. Thus, when the circular plate 210 moves up and down, it can adjust the vacuum degree of the distillation cylinder 200. When the solution boils violently, the hydraulic rod 220 extends to drive the circular plate 210 to move upward. At this time, the space in the distillation cylinder 200 decreases, so the vacuum degree in the distillation cylinder 200 decreases. At this time, the violent boiling state of the solution can be relieved, thus preventing steam from carrying curcumin into the condenser pipe 310. If it is not near the end of distillation and the boiling degree of the solution is low when the electric heating wire reaches the maximum power, the hydraulic rod 220 shortens, causing the circular plate 210 to move downward, thereby increasing the vacuum degree of the distillation cylinder 200 and promoting the boiling of the solution.

[0048] Inside the distillation cylinder 200, a sliding seat 230 is fixedly connected above the circular plate 210. A detection rod 240 is vertically slidably connected to the sliding seat 230. The bottom of the detection rod 240 is fixedly connected with a hollow ball 250. The hollow ball 250 floats in the solution. A displacement sensor is arranged on the sliding seat 230. When the solution violently boils, the height difference of the hollow ball 250 rising and falling on the surface of the solution increases. As a result, the stroke of the detection rod 240 vertically reciprocally sliding on the sliding seat 230 increases. At this time, the hydraulic rod 220 extends. When the hydraulic rod 220 extends, the second water injection pipe 370 injects low-temperature cooling water into the first water injection pipe 360.

[0049] The hollow ball 250 floats on the surface of the solution in the distillation cylinder 200. When the solution boils, the undulation of the liquid level of the solution can push the hollow ball 250 to move up and down. Moreover, the higher the boiling degree, the higher the amplitude of pushing the hollow ball 250 to move up and down. Furthermore, the greater the formation of the detection rod 240 fixedly connected to the hollow ball 250 sliding vertically. A displacement sensor is arranged in the sliding seat 230 to detect the sliding stroke of the detection rod 240. If the sliding stroke of the detection rod 240 is high, it indicates that the solution boils violently. On the contrary, the solution boils mildly. The displacement sensor obtains the stroke signal of the detection rod 240 and transmits it to the control system. When the sliding stroke of the detection rod 240 is large, the hydraulic rod 220 extends. On the contrary, the hydraulic rod 220 shortens. And the relationship between the telescopic distance of the hydraulic rod 220 and the sliding stroke of the detection rod 240 is determined by the algorithm of the interpolation function. The sliding stroke of the detection rod 240 corresponds to the telescopic distance of the hydraulic rod 220.

[0050] In addition, when the control system controls the hydraulic rod 220 to extend, it simultaneously controls the second water injection pipe 370 to inject cooling water into the first water injection pipe 360. Specifically, water pumps are connected to both the first water injection pipe 360 and the second water injection pipe 370. The first water injection pipe 360 is connected to normal-temperature cooling water, and the second water injection pipe 370 is connected to low-temperature cooling water. When starting to distill the solution in the distillation cylinder 200, the water pump connected to the first water injection pipe 360 is in an operating state. When the hydraulic rod 220 extends, the water pump connected to the second water injection pipe 370 starts to operate. And the running time of the water pump of the second water injection pipe 370 is short. The specific running time can be determined by the time required to condense the steam generated after violent boiling and stabilization and then return the liquid to the distillation cylinder 200 during actual use.

[0051] After the water pump connected to the second water injection pipe 370 stops running, the pressure in the control box 350 decreases. At this time, the tension spring 353 pulls the piston plate 351 to reset, so that the spherical valve core 321 rotates reversely, making the condenser tube 310 communicate with the collection cylinder 300 again, ensuring that the collection cylinder 300 can continue to collect the condensed solvent after the violent boiling of the solution is relieved.

[0052] A distance sensor is further arranged at the bottom of the hollow sphere 250. When the distance sensor detects that the distance between the hollow sphere 250 and the circular plate 210 changes from the maximum to one-fourth or one-fifth of the maximum value, the power of the electric heating wire 190 inside the barrel wall of the distillation barrel 200 is reduced, so that the temperature is between twenty degrees and thirty degrees, and the solution is continuously distilled to remove the remaining solvent as much as possible.

[0053] A stirring rod 140 is rotatably connected inside the stirring barrel 120. The top of the stirring barrel 120 is vertically slidably connected with a motor 130. The bottom of the stirring barrel 120 is vertically slidably connected with a filter screen 170. A conical plug 175 is fixedly connected to the lower surface of the filter screen 170. A conical hole matching the conical plug 175 is formed in the partition plate 110. When the motor 130 moves downward, it can drive the filter screen 170 to move upward, so that the conical plug 175 moves upward, so that the stirring barrel 120 communicates with the distillation barrel 200.

[0054] The top of the stirring barrel 120 is fixedly connected to the base 131 through an electric telescopic rod 132. The motor 130 is fixedly connected to the base 131. And a limiting frame for placing the base 131 to rotate is connected to the top of the stirring barrel 120. A groove matching the limiting frame is formed in the base 131. After the stirring of the raw materials and the solvent is completed, the electric telescopic rod 132 is controlled to shorten. At this time, the base 131 drives the motor 130 to move downward, so that the stirring rod 140 connected to the motor 130 moves downward. When the stirring rod 140 moves downward, it can drive the filter screen 170 to move upward, so that a gap appears between the filter screen 170 and the bottom wall of the stirring barrel 120. At the same time, the conical plug 175 connected to the bottom of the filter screen 170 is pulled out of the conical hole on the partition plate 110. At this time, the solvent for extracting curcumin in the mixed liquid in the stirring barrel 120 can enter the distillation barrel 200 through the filter screen 170 and the conical hole on the partition plate 110 for subsequent distillation separation.

[0055] The bottom end of the stirring rod 140 is magnetically adsorbed and rotatably connected with a threaded rod 160. Two rectangular blocks 172 are symmetrically slidably connected to the upper surface of the filter screen 170. Threaded grooves matching the threaded rod 160 are formed on the opposite surfaces of the two rectangular blocks 172. Wedge blocks 174 are fixedly connected to the tops of the two rectangular blocks 172. The bottom end of the stirring rod 140 is key-slidably connected with an inner conical ring 150 through a spring (not shown in the figure). When the inner conical ring 150 moves downward with the stirring rod 140, it can push the two wedge blocks 174 closer to each other, so that the threaded grooves on the inner walls of the two rectangular blocks 172 are both engaged with the threaded rod 160.

[0056] A pin-like structure can be provided at the top of the threaded rod 160, and a groove mating with this pin is formed at the bottom end of the stirring rod 140 to ensure that the threaded rod 160 does not detach from the stirring rod 140. The threaded rod 160 and the bottom end of the stirring rod 140 are magnetically attracted to each other. When the rotational load of the threaded rod 160 is low, the stirring rod 140 can drive the threaded rod 160 to rotate. If the rotational load of the threaded rod 160 is high, the stirring rod 140 can rotate relative to the threaded rod 160, thereby preventing the rotation of the stirring rod 140 from being interfered with;

[0057] The top end of the spring is fixedly connected to the stirring rod 140, and the bottom end is fixedly connected to the top of the inner conical ring 150. When the stirring rod 140 moves downward, it can drive the inner conical ring 150 through the spring, causing the inner conical ring 150 to move downward. At this time, the inner conical ring 150 pushes the two wedge blocks 174 closer to each other, causing the two rectangular blocks 172 to move closer synchronously, so that the thread grooves on the inner walls of the two rectangular blocks 172 are both engaged with the threaded rod 160. At this time, the threaded rod 160 rotates synchronously with the stirring rod 140 to drive the two rectangular blocks 172 to drive the filter screen 170 to move upward. After the two rectangular blocks 172 contact each other, the dredging rod 151 is in contact with the filter screen 170. When the filter screen 170 moves upward, the two rectangular blocks 172 push the inner conical ring 150 to slide upward against the elastic force of the spring, ensuring that the upward movement of the filter screen 170 is not interfered with, and at the same time keeping the dredging rod 151 in contact with the filter screen 170. After the threaded rod 160 rotates until its bottom end contacts the filter screen 170, the threaded rod 160 stops rotating. At this time, the stirring rod 140 can rotate relative to the threaded rod 160.

[0058] Two vertical plates 171 are fixedly connected to the upper surface of the filter screen 170, and a return spring 173 is fixedly connected between the two vertical plates 171 and the two rectangular blocks 172; a limiting block 181 is fixedly connected to the side wall of the filter screen 170, and a sliding groove mating with the limiting block 181 is formed on the inner wall of the stirring cylinder 120, and an air spring 180 is connected between the top wall of the sliding groove and the limiting block 181.

[0059] After the threaded rod 160 stops rotating, the air spring 180 is not in a fully compressed state. After the solution is discharged, the electric telescopic rod 132 is controlled to extend so that the stirring rod 140 moves upward. At the same time, the motor 130 is controlled to reverse. At this time, the downward pressure exerted by the spring on the inner conical ring 150 decreases, and the return spring 173 pulls the two rectangular blocks 172 so that they tend to separate. In the initial stage of the upward movement of the threaded rod 160, the filter screen 170 is driven to continue to move upward through the thread groove on the rectangular block 172, so that the air spring 180 is further compressed. As the threaded rod 160 continues to move upward and the threaded rod 160 driven by the reverse rotation of the motor 130 reverses, the return spring 173 can finally pull the two rectangular blocks 172 back to their original positions. At this time, the air spring 180 drives the filter screen 170 to return to its original position, so that the conical plug 175 blocks the conical hole on the partition plate 110, ensuring that the steam in the distillation cylinder 200 does not enter the stirring cylinder 120, and when a negative pressure appears in the distillation cylinder 200, the air pressure can make the conical plug 175 block the conical hole on the partition plate 110 more firmly.

[0060] A dredging rod 151 is fixedly connected to the side wall of the inner conical ring 150. After the stirring rod 140 and the filter screen 170 approach each other, the dredging rod 151 can fit on the upper surface of the filter screen 170.

[0061] The inner conical ring 150 is keyed and slidably connected to the stirring rod 140, so that when the stirring rod 140 rotates, it can drive the inner conical ring 150 to rotate, so that the dredging rod 151 scrapes the filter screen 170, ensuring the permeability of the filter screen 170 and enabling the solution to flow smoothly in the distillation cylinder 200;

[0062] A fixing ring can be arranged on the periphery of the filter screen 170, and a solid support plate is arranged in the middle of the fixing ring. The new support plate and the fixing ring are fixedly connected by metal rods to ensure that the threaded rod 160 will not pierce the filter screen 170, and at the same time ensure that the edge of the filter screen 170 will not be damaged by friction when moving up and down.

[0063] A curcumin extraction method is applied to a curcumin extraction device, including the following steps:

[0064] Add the crushed raw materials and the solvent into the stirring cylinder 120, start the motor 130 to make the stirring rod 140 stir the raw materials, and at the same time heat the stirring cylinder 120 to dissolve the curcumin in the raw materials in the solvent;

[0065] After the stirring and extraction are completed, control the motor 130 to move downward. At this time, the stirring rod 140 moves downward, so that the spring of the stirring rod 140 drives the inner conical ring 150. At this time, the inner conical ring 150 pushes the two wedge blocks 174 closer to each other, so that the two rectangular blocks 172 approach each other, enabling the threaded rod 160 to drive the filter screen 170 to move upward when rotating with the stirring rod 140. When the filter screen 170 moves upward, the wedge block 174 pushes the inner conical ring 150 to slide upward on the stirring rod 140 against the elastic force of the spring. At this time, the dredging rod 151 contacts the filter screen 170 to scrape the filter screen 170, and the conical plug 175 moves upward, enabling the solvent for extracting curcumin to flow into the distillation cylinder 200;

[0066] After the solvent for extracting curcumin flows into the distillation cylinder 200, control the motor 130 to reverse, so that the filter screen 170 moves downward, thus the conical plug 175 blocks the conical hole of the partition plate 110, closing the distillation cylinder 200. After evacuating the collection cylinder 300 and the distillation cylinder 200 through the vacuum extraction pipe 390, heat the distillation cylinder 200, so that the temperature of the distillation cylinder 200 slowly rises to the maximum temperature required for extraction;

[0067] After the solvent evaporates, it is condensed by the condenser pipe 310 and then enters the collection cylinder 300 for collection. When the solution in the distillation cylinder 200 boils violently, the stroke of the hollow ball 250 floating up and down driven by the violently boiling solution increases, so that the stroke of the detection rod 240 sliding vertically in the sliding seat 230 increases. The displacement sensor on the sliding seat 230 acquires the vertical sliding stroke data of the detection rod 240 and then transmits the data to the control system. The control system controls the hydraulic rod 220 to extend, so that the circular plate 210 moves upward, thus reducing the total volume of the distillation cylinder 200 and the collection cylinder 300. At this time, the degree of negative pressure in the distillation cylinder 200 decreases, thereby alleviating the violent boiling of the solution in the distillation cylinder 200;

[0068] While the control system controls the hydraulic rod 220 to extend, it also controls the low-temperature cooling water to be injected into the first water injection pipe 360 at a fixed time and fixed quantity through the second water injection pipe 370. At this time, the flow rate of the cold water increases, the condensation speed of the steam in the condenser pipe 310 increases, and at the same time, the pressure in the control box 350 increases. At this time, the piston plate 351 slides, so that the rack 352 drives the gear 324 to rotate, so that the condensate containing curcumin due to violent boiling flows back into the distillation cylinder 200 through the condenser pipe 310 and the return pipe 380;

[0069] When the second water injection pipe 370 no longer injects cold water into the first water injection pipe 360, the pressure in the control box 350 drops, and the pull spring 353 pulls the piston plate 351 back to its original position, so that the condenser pipe 310 resumes its connection state with the collection cylinder 300, and continues to collect the condensed solvent;

[0070] If the vertical sliding stroke of the detection rod 240 is low, the control system controls the hydraulic rod 220 to shorten to increase the vacuum degree in the distillation cylinder 200.

[0071] The upper surface of the circular plate 210 is a conical surface. At the lowest point of the conical surface, a discharge pipe 211 communicating with the distillation cylinder 200 is connected. An electromagnetic valve 212 is provided on the discharge pipe 211. After the distillation is completed, opening the electromagnetic valve 212 can enable the curcumin remaining in the distillation cylinder 200 to be discharged.

[0072] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A curcumin extraction device, comprising a cylinder body (100), characterized in that: A partition plate (110) is fixedly connected to the middle of the cylinder body (100). The partition plate (110) divides the cylinder body (100) into a stirring cylinder (120) and a distillation cylinder (200). A condenser pipe (310) is connected to the distillation cylinder (200). A collection cylinder (300) is connected to the condenser pipe (310). A reflux pipe (380) is connected between the condenser pipe (310) and the distillation cylinder (200). A reflux valve is arranged on the condenser pipe (310). A gear (324) is fixedly connected to the valve rod (323) of the reflux valve. When the gear (324) rotates, the condenser pipe (310) can be connected to the collection cylinder (300) or the reflux pipe (380). A condenser cylinder (330) is sleeved on the condenser pipe (310). A water inlet pipe (340) is connected to the condenser cylinder (330). The end of the water inlet pipe (340) is connected to a control box (350). A piston plate (351) is slidably connected in the control box (350). A tension spring (353) is connected between one side of the piston plate (351) and the control box (350). A rack (352) meshing with the gear (324) is connected to the other side of the piston plate (351). A first water injection pipe (360) is also connected to the control box (350). A second water injection pipe (370) is connected to the first water injection pipe (360). The first water injection pipe (360) injects normal temperature cooling water into the condenser cylinder (330). When the solution in the distillation cylinder (200) boils violently, the second water injection pipe (370) injects low temperature cooling water into the first water injection pipe (360), so that the pressure in the control box (350) increases, causing the gear (324) to rotate and the condenser pipe (310) to be connected to the reflux pipe (380).

2. The curcumin extraction device according to claim 1, wherein: The reflux valve further includes a spherical valve housing (320). The spherical valve housing (320) is connected to the condenser pipe (310) and the reflux pipe (380). A spherical valve core (321) is rotatably connected in the spherical valve housing (320). The valve rod (323) is fixedly connected to the spherical valve core (321). A T-shaped hole (322) is opened in the middle of the spherical valve core (321). When the spherical valve core (321) rotates, the T-shaped hole (322) can be connected to the collection cylinder (300) or the reflux pipe (380).

3. The curcumin extraction device according to claim 2, characterized in that: A vacuum extraction pipe (390) is connected to the collection cylinder (300). A one-way valve is arranged on the vacuum extraction pipe (390).

4. The curcumin extraction device according to claim 3, characterized in that: A circular plate (210) is slidably connected inside the distillation cylinder (200). The circular plate (210) is in contact with the inner wall of the distillation cylinder (200). A hydraulic rod (220) is fixedly connected to the bottom wall of the distillation cylinder (200). The output end of the hydraulic rod (220) is fixedly connected to the lower surface of the circular plate (210). When the hydraulic rod (220) extends, it can drive the circular plate (210) to move upward, thereby reducing the distillation space of the distillation cylinder (200), so that the negative pressure degree of the distillation cylinder (200) is reduced to relieve the bumping boiling of the solution.

5. The curcumin extraction device according to claim 4, characterized in that: A sliding seat (230) is fixedly connected inside the distillation cylinder (200) above the circular plate (210). A detection rod (240) is vertically slidably connected to the sliding seat (230). A hollow ball (250) is fixedly connected to the bottom of the detection rod (240). The hollow ball (250) floats on the solution. A displacement sensor is arranged on the sliding seat (230). When the solution bumps and boils, the height difference of the hollow ball (250) fluctuating on the surface of the solution increases. Thus, the stroke of the detection rod (240) vertically reciprocatingly sliding on the sliding seat (230) increases. At this time, the hydraulic rod (220) extends. When the hydraulic rod (220) extends, the second water injection pipe (370) injects low-temperature cooling water into the first water injection pipe (360).

6. The curcumin extraction device according to claim 5, wherein: A stirring rod (140) is rotatably connected inside the stirring cylinder (120). A motor (130) is vertically slidably connected to the top of the stirring cylinder (120). A filter screen (170) is vertically slidably connected to the bottom of the stirring cylinder (120). A conical plug (175) is fixedly connected to the lower surface of the filter screen (170). A conical hole matching the conical plug (175) is formed on the partition plate (110). When the motor (130) moves downward, it can drive the filter screen (170) to move upward, so that the conical plug (175) moves upward, so that the stirring cylinder (120) communicates with the distillation cylinder (200).

7. The curcumin extraction device according to claim 6, characterized in that: The bottom end of the stirring rod (140) is rotatably connected to a threaded rod (160) by magnetic adsorption. Two rectangular blocks (172) are symmetrically slidably connected to the upper surface of the filter screen (170). Thread grooves matching the threaded rod (160) are formed on the opposite surfaces of the two rectangular blocks (172). Wedge blocks (174) are fixedly connected to the tops of the two rectangular blocks (172). The bottom end of the stirring rod (140) is slidably connected to an inner conical ring (150) by a spring key. When the inner conical ring (150) moves downward with the stirring rod (140), it can push the two wedge blocks (174) to approach each other, so that the thread grooves on the inner walls of the two rectangular blocks (172) are both engaged with the threaded rod (160).

8. The curcumin extraction device according to claim 7, characterized in that: Two vertical plates (171) are fixedly connected to the upper surface of the filter screen (170). A reset spring (173) is fixedly connected between the two vertical plates (171) and the two rectangular blocks (172); A limiting block (181) is fixedly connected to the side wall of the filter screen (170), a sliding groove matching with the limiting block (181) is formed in the inner wall of the mixing cylinder (120), and an air spring (180) is connected between the top wall of the sliding groove and the limiting block (181).

9. The curcumin extraction device according to claim 8, wherein: A dredging rod (151) is fixedly connected to the side wall of the inner conical ring (150). After the stirring rod (140) and the filter screen (170) approach each other, the dredging rod (151) can be attached to the upper surface of the filter screen (170).

10. A method for extracting curcumin, which uses the curcumin extraction device described in claim 9, is characterized in that, Including the following steps: Add the crushed raw materials and the solvent into the mixing cylinder (120), start the motor (130) to make the stirring rod (140) stir the raw materials, and heat the mixing cylinder (120) at the same time to dissolve the curcumin in the raw materials in the solvent; After the stirring and extraction are completed, control the motor (130) to move downward. At this time, the stirring rod (140) moves downward, so that the spring of the stirring rod (140) drives the inner conical ring (150). At this time, the inner conical ring (150) pushes the two wedge blocks (174) to approach each other, so that the two rectangular blocks (172) approach each other, so that the threaded rod (160) can drive the filter screen (170) to move upward when rotating with the stirring rod (140). When the filter screen (170) moves upward, the wedge block (174) pushes the inner conical ring (150) to slide upward on the stirring rod (140) against the elastic force of the spring. At this time, the dredging rod (151) contacts the filter screen (170) to scrape the filter screen (170), and the conical plug (175) moves upward, so that the solvent for extracting curcumin flows into the distillation cylinder (200); After the solvent for extracting curcumin flows into the distillation cylinder (200), control the motor (130) to reverse, so that the filter screen (170) moves downward, so that the conical plug (175) plugs the conical hole of the partition plate (110), so that the distillation cylinder (200) is closed. After evacuating the collection cylinder (300) and the distillation cylinder (200) through the vacuum pumping pipe (390), heat the distillation cylinder (200) so that the temperature of the distillation cylinder (200) slowly rises to the highest temperature required for extraction; The evaporated solvent is condensed by the condenser tube (310) and then enters the collection cylinder (300) for collection. When the solution in the distillation cylinder (200) boils violently, the floating stroke of the hollow ball (250) pushed up and down by the violently boiling solution increases, so that the vertical sliding stroke of the detection rod (240) on the sliding seat (230) increases. The displacement sensor on the sliding seat (230) obtains the vertical sliding stroke data of the detection rod (240) and then transmits the data to the control system. The control system controls the hydraulic rod (220) to extend, so that the circular plate (210) moves upward, so that the total volume of the distillation cylinder (200) and the collection cylinder (300) decreases. At this time, the degree of negative pressure in the distillation cylinder (200) decreases, thereby alleviating the violent boiling of the solution in the distillation cylinder (200); While the control system controls the hydraulic rod (220) to extend, it also controls the low-temperature cooling water to be injected into the first water injection pipe (360) through the second water injection pipe (370) regularly and quantitatively. At this time, the flow rate of cold water intake increases, the steam condensation speed in the condenser tube (310) increases, and at the same time, the pressure in the control box (350) increases. At this time, the piston plate (351) slides, so that the rack (352) drives the gear (324) to rotate, so that the condensate containing curcumin due to boiling overflows returns to the distillation cylinder (200) through the condenser tube (310) and the return pipe (380); When the second water injection pipe (370) no longer injects cold water into the first water injection pipe (360), the pressure in the control box (350) drops, and the tension spring (353) pulls the piston plate (351) back to its original position, so that the condenser tube (310) resumes its connection state with the collection cylinder (300), and continues to collect the condensed solvent; If the vertical sliding stroke of the detection rod (240) is low, the control system controls the hydraulic rod (220) to shorten to increase the vacuum degree in the distillation cylinder (200).

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