A slow extraction device

Abstract

The embodiment of the present application provides a slow extraction device, and relates to the technical field of extraction devices.The slow extraction device comprises an extraction tank body, a stirring fin, a transmission part, a spray head and a screen, the diameter of the upper end surface of the extraction tank body is smaller than the diameter of the lower end surface, the stirring fin is only installed at the bottom of the extraction cavity, the transmission part is connected with the stirring fin, the transmission part is used for driving the stirring fin to rotate, the spray head is arranged on the side wall of the extraction cavity, and the screen is arranged on the bottom of the extraction cavity and above the stirring fin, so that the stirring fin is used for fully stirring the extraction object on the screen in the rotating state. The contact area of the extraction liquid and the extraction object is increased in the same volume, so that the extraction yield is improved, the extraction object is accumulated on the screen at the bottom of the extraction cavity, the stirring fin can timely wipe and disperse the extraction object, liquid can be uniformly sprayed on the surface of the extraction object for extraction. The extraction liquid can be fully mixed with the extraction object in a slow state.

Description

Technical Field

[0001] This invention relates to the field of extraction apparatus technology, and more specifically, to a slow extraction apparatus. Background Technology

[0002] Extraction devices typically use solvents to separate components from a solid mixture. These devices utilize extraction processes and are widely used in daily life and production. Existing extraction devices generally involve adding a liquid substance into the extraction vessel to perform the extraction operation.

[0003] There is a need in the existing technology to slowly extract the substance to be extracted in order to extract a sufficient amount of the specific substance. Slow extraction generally cannot quickly immerse the extract into the extractant, but requires the extractant and extractant to come into contact slowly. Existing extraction devices are prone to the phenomenon of the extractant clumping and insufficient contact between the extractant and extractant, resulting in low extraction efficiency. Summary of the Invention

[0004] This invention provides a slow extraction device that can effectively avoid clumping during the extraction process, ensuring sufficient extraction while guaranteeing full contact between the extract and the extract, resulting in good extraction effect and improved extraction efficiency.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] An embodiment of the present invention provides a slow extraction apparatus, comprising:

[0007] An extraction vessel, wherein the diameter of the upper end face of the extraction vessel is smaller than the diameter of the lower end face, and the extraction vessel has an extraction chamber;

[0008] A stirring rake, wherein the stirring rake is installed only at the bottom of the extraction chamber; and

[0009] A transmission component is connected to the stirring rake, and the transmission component is used to drive the stirring rake to rotate;

[0010] A nozzle is disposed on the side wall of the extraction chamber and is located above the stirring rake;

[0011] A sieve, wherein the sieve is disposed at the bottom of the extraction chamber;

[0012] The stirring rake is installed on the upper part of the screen so that it can be used to thoroughly stir the extract on the screen while rotating.

[0013] Optionally, the stirring rake includes a connecting rod and a plurality of rake claws. One end of the connecting rod is connected to the transmission component, and the other end of the connecting rod is simultaneously connected to the plurality of rake claws. The plurality of rake claws are spaced apart along the circumferential direction.

[0014] Optionally, the rake claw includes a mounting rod and a plurality of rake pins. The mounting rod and the connecting rod are arranged vertically, and the ends of the mounting rod and the connecting rod away from the transmission member are connected. The plurality of rake pins are spaced apart along the length direction of the mounting rod.

[0015] Optionally, the number of rake claws is three, and the three rake claws are evenly arranged along the circumference.

[0016] Optionally, the length of each of the rakes on the mounting rod is different, and each rake can form concentric circles of different diameters when rotated.

[0017] Optionally, there are multiple nozzles, which are disposed on the sidewall of the extraction chamber and spaced apart along the circumferential direction.

[0018] Optionally, the number of nozzles is five, and the five nozzles are evenly distributed along the circumference. The incident positions of the first, third, and fourth nozzles are the same as their distribution positions, while the incident positions of the second and fifth nozzles deviate from their distribution positions, shifting 20-30° away from the first nozzle.

[0019] Optionally, the nozzle includes a spray bar and a nozzle, one end of the spray bar is connected to the extraction tank, and the other end of the spray bar is connected to the nozzle, the nozzle being used to spray atomized water toward the surface of the substance to be extracted.

[0020] Optionally, the nozzle includes a connecting part, a support rod, and a corrugated distribution plate. The connecting part is connected to the spray bar, and the connecting part has an outlet for spraying atomized water. The support rod is connected to the connecting part, and the corrugated distribution plate is connected to the support rod. The position of the corrugated distribution plate corresponds to the position of the outlet and is spaced apart from the outlet.

[0021] Optionally, the spray bar has an arc-shaped structure, and the ratio of the height of the end of the spray bar connected to the extraction tank from the upper surface of the stirring rake to the height from the screen is 1:1.6-2.

[0022] The beneficial effects of the extraction apparatus of this invention include, for example:

[0023] The slow extraction device includes an extraction tank, a stirring rake, a transmission component, a nozzle, and a screen. The diameter of the upper end face of the extraction tank is smaller than the diameter of the lower end face. The extraction tank has an extraction chamber. The stirring rake is installed only at the bottom of the extraction chamber. The transmission component is connected to the stirring rake and is used to drive the stirring rake to rotate. The nozzle is located on the side wall of the extraction chamber and is positioned above the stirring rake. The screen is located at the bottom of the extraction chamber, and the stirring rake is above the screen, so that the stirring rake can fully agitate the extract on the screen while rotating. When in use, the slow extraction device has the largest bottom cross-section and the smallest top cross-section of the extraction tank, which increases the contact area between the extraction liquid and the extractant with the same volume, thereby improving the extraction yield. The extractant is piled on the screen at the bottom of the extraction chamber, and the stirring rake is installed on the top of the screen at the bottom of the extraction chamber. The transmission component drives the stirring rake to rotate, and the stirring rake fully stirs the extractant on the screen. The nozzle is located above the stirring rake and sprays towards the extractant. The stirring rake promptly smooths and disperses the extractant, ensuring that the liquid is evenly sprayed on the surface of the extractant for extraction, and also ensuring the diffusion time for water to penetrate into the extractant. The combination of the nozzle and the stirring rake allows the extractant to be fully mixed with the material to be extracted at a slow speed. The extractant penetrates from the outside of the powder to the inside for thorough extraction, while avoiding clumping of the extractant caused by excessively rapid wetting of the outside of the powder. The reduction of external clumping further ensures contact between the inside of the powder and the extractant, thereby ensuring sufficient extraction, good extraction effect, and improved extraction efficiency. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the extraction device provided in this embodiment;

[0026] Figure 2 This is a schematic diagram of the structure of the stirring rake provided in this embodiment;

[0027] Figure 3 This is a schematic diagram of the structure of the multiple nozzles provided in this embodiment;

[0028] Figure 4 This is a schematic diagram of the nozzle structure provided in this embodiment.

[0029] Icons: 10-Extraction tank; 11-Extraction chamber; 20-Stirring rake; 21-Connecting rod; 22-Rake claw; 221-Mounting rod; 222-Rake nail; 30-Transmission component; 40-Nozzle; 41-Spray bar; 42-Nozzle; 421-Connecting part; 422-Support rod; 423-Corrugated distribution plate; 50-Screen; 60-Bottom end cap; 100-Extraction device. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0034] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0035] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0036] Extraction devices typically use solvents to separate components from a solid mixture. These devices utilize extraction processes and are widely used in daily life and production. Existing extraction devices generally involve adding a liquid substance into the extraction vessel to perform the extraction operation.

[0037] The extraction devices in related technologies are prone to causing the extractant to clump together, resulting in low extraction efficiency.

[0038] Please refer to Figures 1-4 This embodiment provides a slow extraction device 100, which can effectively improve the technical problems mentioned above, avoid clumping during the extraction process, ensure sufficient extraction, guarantee good extraction effect, and improve extraction efficiency.

[0039] Please refer to Figures 1-4 This embodiment provides a slow extraction device 100 including an extraction tank 10, a stirring rake 20, a transmission component 30, a nozzle 40, and a screen 50. The diameter of the upper end face of the extraction tank 10 is smaller than the diameter of the lower end face. The extraction tank 10 has an extraction chamber 11. The stirring rake 20 is installed at the bottom of the extraction chamber 11. The transmission component 30 is connected to the stirring rake 20 and is used to drive the stirring rake 20 to rotate, so that the stirring rake 20 can fully stir the extractant while rotating. The nozzle 40 is disposed on the side wall of the extraction chamber 11 and is located above the stirring rake 20. The screen 50 is located at the bottom of the extraction chamber 11 and is used to place the extractant and filter impurities in the extract. The stirring rake is above the screen 50, so that the stirring rake 20 can fully stir the extractant on the screen 50 while rotating.

[0040] In this embodiment, the extraction tank 10 has a frustum structure.

[0041] Understandably, the aperture size of the sieve 50 is adjusted according to the size of the material to be extracted, and no specific limitation is made here.

[0042] Specifically, in existing extraction devices, when the extraction particles are small solid extractables, most of the extraction media used are RO water. When water and solid extractables are mixed, the surface tension of water causes the extractables to clump together. At this time, the surface of the extractables is wet, but the inside is dry. Water cannot mix completely with the extractables, resulting in low extraction efficiency. To solve the above-mentioned technical problems, the extraction device 100 provided in this embodiment has a bottom cross-section of the extraction tank 10 that is the largest and a top cross-section that is the smallest when in use. This increases the contact area between the extraction liquid and the extractant in the same volume, thereby improving the extraction yield. The extractant is piled on the screen 50 at the bottom of the extraction chamber 11. The stirring rake 20 is installed on the upper part of the screen 50 at the bottom of the extraction chamber 11. The transmission component 30 drives the stirring rake 20 to rotate. The stirring rake 20 fully stirs the extractant on the screen 50. The nozzle 40 is located above the stirring rake 20 and sprays towards the extractant. The stirring rake 20 promptly smooths and disperses the extractant, ensuring that the liquid can be evenly sprayed onto the surface of the extractant for extraction and that the diffusion time for water to penetrate into the extractant is guaranteed. The combination of nozzle 40 and stirring rake allows the extractant to be fully mixed with the material to be extracted at a slow speed. The extractant penetrates from the outside of the powder to the inside for thorough extraction, while avoiding clumping of the extract caused by excessively rapid wetting of the outside of the powder. The reduction of external clumping further ensures contact between the inside of the powder and the extractant, thus ensuring sufficient extraction, good extraction effect, and improved extraction efficiency.

[0043] In this embodiment, the substance to be extracted is a powder. In other embodiments, the substance to be extracted may be other substances, which are not specifically limited here.

[0044] Both the top and bottom of the extraction tank 10 are equipped with butterfly-shaped end caps. The extraction tank 10 is evacuated by a vacuum pump to make the extraction chamber 11 negative pressure. At this time, due to the large pressure difference between the inside and outside of the extraction tank, the powder can be drawn into the extraction chamber 11 from the top.

[0045] Figure 2 The structural features of the stirring rake 20 are shown in detail below.

[0046] Please refer to Figure 2 It should be noted that the stirring rake 20 includes a connecting rod 21 and multiple rake claws 22. One end of the connecting rod 21 is connected to the transmission component 30, and the other end of the connecting rod 21 is simultaneously connected to multiple rake claws 22. The multiple rake claws 22 are spaced apart along the circumferential direction.

[0047] Specifically, the connecting rod 21 is vertically positioned in the middle of the extraction chamber 11, with its upper end connected to the transmission component 30 and its lower end connected to the rake claw 22.

[0048] In this embodiment, the transmission component 30 is a drive motor.

[0049] Specifically, the rake claw 22 includes a mounting rod 221 and a plurality of rake nails 222. The mounting rod 221 and the connecting rod 21 are arranged vertically, and the ends of the mounting rod 221 and the connecting rod 21 away from the transmission member 30 are connected. The plurality of rake nails 222 are spaced apart along the length of the mounting rod 221. The plurality of rake nails 222 are arranged vertically and rotate under the drive of the mounting rod 221, thereby stirring the material to be extracted.

[0050] It should be noted that during the extraction process, the connecting rod 21 drives the rake 22 to rotate under the drive of the transmission component 30. The rake 22 can agitate the extractant while rotating, so that the extractant and water can be fully mixed, avoiding the water from not being able to completely wet the extractant, avoiding clumping, and improving the extraction yield.

[0051] In this embodiment, there are three rake claws 22, which are evenly arranged along the circumference.

[0052] It should also be noted that, to ensure the stirring effect of the rake 222 and to improve its stirring efficiency, the length of each rake 222 on the mounting rod 221 is not the same. Furthermore, the positions of all the rakes 222 on any given mounting rod 221 are different, ensuring that the diameter of the circular trajectory formed by each rake 222 during rotation is different. Each rake 222, when rotating, can form concentric circles of different diameters, thereby thoroughly stirring the extractant and ensuring all-around stirring to prevent clumping.

[0053] More often, the rake 222 is set in the vertical direction.

[0054] In this embodiment, the length of the rake 222 is 40cm.

[0055] In addition, there are multiple nozzles 40, which are disposed on the side wall of the extraction chamber 11 and are spaced apart along the circumferential direction.

[0056] Specifically, in existing extraction devices, when the material to be extracted is powder, the extraction time is generally long. Therefore, after the powder is moistened, water is directly introduced into the extraction tank. This extraction method leads to uneven extraction, resulting in large fluctuations in the concentration of the extract. To solve the above technical problem, the extraction device 100 of this embodiment has multiple nozzles 42 on the side wall of the extraction chamber 11. Water is introduced into the nozzles 40 at a certain pressure and flow rate and sprayed onto the surface of the powder in an atomized form. It penetrates into the powder in a slow soaking and extraction manner, avoiding the presence of a large amount of water in the extract and improving the uniformity of the extract.

[0057] In this embodiment, the nozzle 40 includes a spray bar 41 and a nozzle 42. One end of the spray bar 41 is connected to the extraction tank, and the other end of the spray bar 41 is connected to the nozzle 42. The nozzle 42 is used to spray atomized water toward the surface of the substance to be extracted.

[0058] Specifically, the nozzle 42 includes a connecting part 421, a support rod 422, and a corrugated distribution plate 423. The connecting part 421 is connected to the spray bar 41. The connecting part 421 has an outlet for spraying atomized water. The support rod 422 is connected to the connecting part 421, and the corrugated distribution plate 423 is connected to the support rod 422. The position of the corrugated distribution plate 423 corresponds to the position of the outlet and is spaced apart from the outlet.

[0059] The connecting part 421 and the spray bar 41 are threaded together, and the corrugated distribution plate 423 and the support rod 422 are fixedly connected.

[0060] In this embodiment, the cross-section of the support rod 422 is a frustum-shaped structure.

[0061] In this embodiment, the spray bar 41 has an arc-shaped structure.

[0062] Furthermore, in order to comprehensively balance the wetting and stirring effects, and at the same time to improve the extraction efficiency, the height of the end of the spray bar 41 connected to the extraction tank 10 from the upper surface of the stirring rake is in a ratio of 1:1.6-2 to the height from the screen 50.

[0063] Specifically, the height of the end of the spray bar 41 connected to the extraction tank 10 ranges from 100cm to 130cm. In this embodiment, the height of the end of the spray bar 41 connected to the extraction tank 10 is 100cm. In other embodiments, the height of the end of the spray bar 41 connected to the extraction tank 10 can also be 120cm or 130cm. No specific limitation is made here.

[0064] Furthermore, the distance between the two ends of the spray bar 41 is 21cm, there is a height difference between the two ends of the spray bar 41, the end of the spray bar 41 connected to the extraction tank 10 is located above the end of the spray bar 41 connected to the nozzle 42, and the height difference between the two ends is 28cm.

[0065] In this embodiment, there are five nozzles 40, which are spaced apart along the circumference and evenly distributed. The first, third, and fourth nozzles have the same incident position as their distribution position, while the second and fifth nozzles have incident positions that deviate from their distribution position, shifting 20°-30° away from the first nozzle 40. This ensures that after the liquid is sprayed from all the nozzles 40, it can cover all areas within the extraction chamber 11, thereby allowing the atomized liquid to be evenly distributed on the extract.

[0066] Specifically, with Figure 3 The specific locations are explained below. The topmost nozzle 40 is defined as the first nozzle, and the nozzles in clockwise order are the second, third, fourth, and fifth nozzles.

[0067] In other embodiments, the number of nozzles 40 may be increased or decreased, and no specific limitation is made here.

[0068] Furthermore, the outlet positions of each nozzle 42 are uniformly distributed along the circumferential direction. In this embodiment, the angle between the outlets of two adjacent nozzles 42 is 72°.

[0069] In addition, the extraction device 100 also includes a bottom end cap 60 and a connecting flange. The bottom end cap 60 is connected to the extraction tank 10 via the connecting flange, and the connecting flange is connected to the bottom of the extraction tank 10.

[0070] Specifically, a cylinder is provided on the bottom end cap 60, and the cylinder is connected to an external controller. The cylinder is used to open or close the bottom end cap 60 under the control of the controller, thereby achieving the effect of automated extraction.

[0071] Furthermore, the extraction apparatus 100 also includes a vacuum pump, which is located outside the extraction tank 10 and communicates with the extraction chamber 11. The vacuum pump is used to perform vacuum treatment on the extraction chamber 11.

[0072] The slow extraction device 100 provided in this embodiment has at least the following advantages:

[0073] In existing extraction devices, when the material to be extracted is powder, the extraction time is generally long. Therefore, after the powder is wetted, water is directly introduced into the extraction tank. This extraction method leads to uneven extraction, resulting in large fluctuations in the concentration of the extract. To solve the above technical problems, the extraction device 100 of this embodiment has multiple nozzles 42 on the side wall of the extraction chamber 11. Water is introduced into the nozzles 40 at a certain pressure and flow rate and sprayed onto the surface of the powder in an atomized form. It penetrates into the powder in a slow soaking and extraction manner, avoiding the presence of a large amount of water in the extract and improving the uniformity of the extract.

[0074] In summary, this embodiment of the invention provides a slow extraction device 100, which includes an extraction tank 10, a stirring rake 20, a transmission component 30, a nozzle 40, and a screen 50. The diameter of the upper end face of the extraction tank 10 is smaller than the diameter of the lower end face. The extraction tank 10 has an extraction chamber 11. The stirring rake 20 is installed only at the bottom of the extraction chamber 11. The transmission component 30 is connected to the stirring rake 20 and is used to drive the stirring rake 20 to rotate. The nozzle 40 is disposed on the side wall of the extraction chamber 11 and is located above the stirring rake 20. The screen 50 is located at the bottom of the extraction chamber 11, and the stirring rake is above the screen 50, so that the stirring rake 20 is used to fully stir the extract on the screen 50 while rotating. When the slow extraction device 100 is in use, the bottom cross-section of the extraction tank 10 is the largest and the top cross-section is the smallest, which increases the contact area between the extraction liquid and the extractant with the same volume, thereby improving the extraction yield. The extractant is piled on the screen 50 at the bottom of the extraction chamber 11. The stirring rake 20 is installed on the upper part of the screen 50 at the bottom of the extraction chamber 11. The transmission component 30 drives the stirring rake 20 to rotate. The stirring rake 20 fully stirs the extractant on the screen 50. The nozzle 40 is located above the stirring rake 20 and sprays towards the extractant. The stirring rake 20 promptly smooths and disperses the extractant, which on the one hand allows the liquid to be sprayed evenly on the surface of the extractant for extraction, and on the other hand ensures the diffusion time for water to penetrate into the interior of the extractant. The combination of nozzle 40 and stirring rake 20 allows the extractant to be fully mixed with the material to be extracted at a slow speed. The extractant penetrates from the outside of the powder to the inside for thorough extraction, while avoiding clumping of the extract caused by excessively rapid wetting of the outside of the powder. The reduction of external clumping further ensures contact between the inside of the powder and the extractant, thereby ensuring sufficient extraction, good extraction effect, and improved extraction efficiency.

[0075] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A slow extraction device, characterized in that, include: The extraction tank (10) has an upper end face diameter smaller than the lower end face diameter and has an extraction chamber (11). A stirring rake (20) is installed only at the bottom of the extraction chamber (11); A transmission component (30) is connected to the stirring rake (20), and the transmission component (30) is used to drive the stirring rake (20) to rotate; The nozzle (40) is disposed on the side wall of the extraction chamber (11) and is located above the stirring rake (20); A sieve (50) is disposed at the bottom of the extraction chamber (11); The stirring rake (20) is installed on the upper part of the screen (50) so that the stirring rake (20) is used to fully stir the extract on the screen (50) while rotating; The stirring rake (20) includes a connecting rod (21) and a plurality of rake claws (22). One end of the connecting rod (21) is connected to the transmission component (30), and the other end of the connecting rod (21) is simultaneously connected to a plurality of rake claws (22). The plurality of rake claws (22) are spaced apart along the circumferential direction. The rake claw (22) includes a mounting rod (221) and a plurality of rake nails (222). The mounting rod (221) and the connecting rod (21) are arranged vertically, and the mounting rod (221) and the connecting rod (21) are connected at one end away from the transmission member (30). The plurality of rake nails (222) are spaced apart along the length direction of the mounting rod (221).

2. The slow extraction apparatus according to claim 1, characterized in that, The number of the rake claws (22) is three, and the three rake claws (22) are evenly arranged along the circumference.

3. The slow extraction apparatus according to claim 2, characterized in that, Each of the rakes (222) has a different length on the mounting rod (221), and each rake (222) can form concentric circles of different diameters when rotated.

4. The slow extraction apparatus according to claim 1, characterized in that, The number of nozzles (40) is multiple, and the multiple nozzles (40) are disposed on the side wall of the extraction chamber (11), and the multiple nozzles (40) are spaced apart along the circumferential direction.

5. The slow extraction apparatus according to claim 4, characterized in that, The number of nozzles (40) is five, and the five nozzles (40) are evenly distributed along the circumference. The incident positions of the first nozzle, the third nozzle, and the fourth nozzle are the same as their distribution positions, while the incident positions of the second nozzle and the fifth nozzle deviate from their distribution positions and deviate 20-30° away from the first nozzle.

6. The slow extraction apparatus according to claim 4, characterized in that, The nozzle (40) includes a spray bar (41) and a nozzle (42). One end of the spray bar (41) is connected to the extraction tank (10), and the other end of the spray bar (41) is connected to the nozzle (42). The nozzle (42) is used to spray atomized water toward the surface of the substance to be extracted.

7. The slow extraction apparatus according to claim 6, characterized in that, The nozzle (42) includes a connecting part (421), a support rod (422), and a corrugated distribution plate (423). The connecting part (421) is connected to the spray bar (41). The connecting part (421) has an outlet for spraying atomized water. The support rod (422) is connected to the connecting part (421). The corrugated distribution plate (423) is connected to the support rod (422). The position of the corrugated distribution plate (423) corresponds to the position of the outlet and is spaced apart from the outlet.

8. The slow extraction apparatus according to claim 6, characterized in that, The spray bar (41) has an arc-shaped structure. The ratio of the height of the end of the spray bar (41) connected to the extraction tank (10) from the upper surface of the stirring rake to the height from the screen (50) is 1:1.6-2.

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