Continuous extraction apparatus and continuous extraction method

Abstract

The present application provides a continuous extraction device and a continuous extraction method, the continuous extraction device comprising: a plurality of extraction workstations uniformly distributed along the circumferential direction; a central distributor located in the center of the plurality of extraction workstations and capable of rotating with each extraction workstation, the central distributor being in fluid communication with each extraction workstation for supplying water and / or gas to the extraction workstation and for receiving the extraction liquid from each extraction workstation; and a feed section located above one of the extraction workstations and used to supply raw materials to the extraction workstation. The continuous extraction device of the present application has multiple functions, can realize continuous and flexible extraction of different raw materials at different pressures and / or different temperatures at the same time, can realize compact extraction of raw materials in a wide temperature range, and can realize air replacement extraction, pressurized extraction, and uniform water addition extraction to reduce the concern of oxidation during extraction, ensure that the raw materials can be uniformly extracted, and there will be no component blocking problem during the discharge of the extract.

Description

TECHNICAL FIELD

[0001] The present application relates to a continuous extraction device and a continuous extraction method for a beverage, in particular, a continuous extraction device and a continuous extraction method for tea and coffee and food-grade raw materials suitable for extraction. BACKGROUND

[0002] Extraction processes have been widely used in the beverage industry, especially in the tea and coffee categories.

[0003] At present, various types of extraction devices with different functions have appeared, and different types of designs are used to achieve different extraction functions, and these extraction devices are often incompatible.

[0004] Considering that there is currently no single extraction device that can simultaneously cover continuous extraction, a wide range of extraction temperatures, pressurized extraction, air displacement extraction, uniform water addition extraction, and anti-clogging discharge, etc. Therefore, the present application provides an improved continuous extraction device covering all the above functions. SUMMARY

[0005] One object of the present application is to provide a continuous extraction device and an extraction method under different process conditions, which can realize continuous extraction, improve extraction efficiency under the premise of ensuring the uniformity of the flavor of the extraction liquid.

[0006] Another object of the present application is to provide a continuous extraction device and an extraction method under different process conditions, which can continuously extract with flexible ingredient supply, and the same single raw material, the same mixed raw material, different single raw material or different mixed raw material can be used in each extraction workstation.

[0007] Still another object of the present application is to provide a continuous extraction device and a continuous extraction method, which can provide a wide range of extraction temperatures, pressurized extraction, air displacement extraction, uniform water addition extraction, and various extraction functions such as anti-clogging discharge.

[0008] To achieve the above objects, the present application provides a continuous extraction device, which comprises:

[0009] a plurality of extraction workstations uniformly distributed in the circumferential direction;

[0010] a central distributor located in the center of the plurality of extraction workstations and capable of rotating with each extraction workstation, the central distributor being in fluid communication with each extraction workstation for supplying water and / or air to the extraction workstations and for receiving extraction liquid from each extraction workstation; and

[0011] a feeding part located above one of the extraction workstations and used to supply raw materials to the extraction workstations.

[0012] In a preferred embodiment, the central distributor has at least two independent fluid channels therein, each fluid channel being in fluid communication with one of the extraction stations, and each fluid channel being used to deliver water at different temperatures and / or gas at different pressures.

[0013] In a preferred embodiment, the raw materials in each extraction station are the same single raw material, the same mixed raw material, different single raw materials, or different mixed raw materials.

[0014] In a preferred embodiment, the extraction station has a first supply portion and a second supply portion in the center thereof, the first supply portion being above the second supply portion, and the first supply portion and the second supply portion being in fluid communication through a supply conduit.

[0015] In a preferred embodiment, the first supply portion is a spray ball, and the second supply portion is a porous tube, the porous tube being arranged vertically and at least a portion of the porous tube being immersed in the raw material at the bottom of the extraction station.

[0016] In a preferred embodiment, the central distributor has a plurality of distribution conduits in the circumferential direction thereof, each distribution conduit being in fluid communication with the supply conduit in the corresponding extraction station.

[0017] In a preferred embodiment, the plurality of distribution conduits fluidly connect the fluid channels in the central distributor to the corresponding extraction stations.

[0018] In a preferred embodiment, the distribution conduits are made of high-temperature resistant material.

[0019] In a preferred embodiment, a first control valve is provided on the supply conduit between the first supply portion and the distribution conduit, and a second control valve is provided on the supply conduit between the second supply portion and the distribution conduit.

[0020] In a preferred embodiment, the distribution conduit includes a water supply distribution conduit and a gas supply distribution conduit in parallel, the water supply distribution conduit being provided with a third control valve for opening or closing the water supply distribution conduit, and the gas supply distribution conduit being provided with a fourth control valve for opening or closing the gas supply distribution conduit.

[0021] In a preferred embodiment, the bottom of the extraction station is provided with an extractant discharge port, the extractant discharge port being in fluid communication with the central distributor through a conduit, and a fifth control valve being provided on the conduit connected to the extractant discharge port for controlling the discharge of the extractant.

[0022] In a preferred embodiment, the bottom of the extraction workstation is provided with a gas discharge port, which is also connected to a gas source for backwashing the bottom of the extraction workstation, and a sixth control valve is arranged on the pipeline connected to the gas discharge port to control the discharge of the gas.

[0023] In a preferred embodiment, a discharge section is further arranged below one of the extraction workstations and is used to carry and transport the extraction residues discharged from the extraction workstation.

[0024] In a preferred embodiment, each two fluid channels are separated by a predetermined distance.

[0025] In a preferred embodiment, the fluid channels are nested with each other.

[0026] The present application also provides a continuous extraction method using the above-mentioned continuous extraction device, wherein the number of extraction workstations is N, and the working positions of the N extraction workstations are N workstations, and the method comprises the following steps:

[0027] (1) When the No. 1 extraction workstation is located at the No. 1 workstation directly below the feeding section, open the top cover of the No. 1 extraction workstation, pour the raw materials into the No. 1 extraction workstation from the feeding section, and cover the top cover of the No. 1 extraction workstation;

[0028] (2) All extraction workstations are simultaneously moved to the next workstation, at this time, the No. 1 extraction workstation is moved to the No. 2 workstation, and the water and / or gas treatment is started by the central distributor according to the production needs to start the extraction process; the No. 2 extraction workstation is moved to the No. 1 workstation, and the feeding process of the No. 1 extraction workstation is repeated;

[0029] (3) When the No. 1 extraction workstation is moved to the No. N-2 workstation, the extraction is completed;

[0030] (4) When the No. 1 extraction workstation is moved to the No. N-1 workstation, the extraction liquid is discharged from the extraction liquid discharge port at the bottom of the extraction workstation and flows back to the extract recovery device below the central distributor;

[0031] (5) When the No. 1 extraction workstation is moved to the No. N workstation, the residue discharge and cleaning of the extraction workstation are performed;

[0032] (6) The No. 1 extraction workstation returns to the No. 1 workstation, and the steps (1)-(5) are repeated, and the other extraction workstations are sequentially performed.

[0033] The beneficial effects of the present application are that the continuous extraction device of the present application has multiple functions, compared to the traditional extraction device, the present application can realize continuous and flexible extraction of different raw materials at different pressures and / or different temperatures at the same time. Therefore, the device of the present application can produce a wider range of flavors, such as cold extraction, hot extraction and espresso coffee, etc. In addition, the device of the present application can realize compact extraction of raw materials in a wide temperature range, and can realize air replacement extraction, pressurized extraction, uniform water extraction, to ensure that the raw materials can be uniformly extracted, reduce the concern of oxidation during the extraction process, and there will be no component blocking problem during the extraction discharge. Moreover, reducing manual is another advantage, because it does not need to manually load and unload the raw materials, the automatic control system makes the extraction process under stable conditions. BRIEF DESCRIPTION OF DRAWINGS

[0034] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the accompanying drawings, in which:

[0035] Figure 1 is a schematic view of a continuous extraction device according to a first embodiment of the present application;

[0036] Figure 2 is a schematic view of a central distributor according to a first embodiment of the present application, together with the structure of an extraction station;

[0037] Figure 3 is a top view of a central distributor according to a first embodiment of the present application, together with an extraction station;

[0038] Figure 4 is a schematic view of an extraction station according to a first embodiment of the present application;

[0039] Figure 5 is a schematic view of a central distributor according to a second embodiment of the present application. DETAILED DESCRIPTION

[0040] In order to enable a more complete understanding of the above-mentioned purposes, features and advantages of the present application, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the features in the same embodiments and different embodiments of the present application can be combined with each other without conflict.

[0041] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, however, the present application can also be implemented in other ways different from those described herein, therefore, the scope of protection of the present application is not limited by the specific embodiments disclosed below.

[0042] First embodiment

[0043] The following reference Figure 1 The continuous extraction apparatus provided according to the first embodiment of the present invention mainly includes: a central distributor 1, an extraction workstation 2, a feeding section 3, and a discharging section 4. Furthermore, it should be noted that the continuous extraction apparatus of this application is not limited to tea leaves and coffee beans in its ability to extract raw materials; it can also be applied to other food-grade extraction raw materials, such as mixed raw materials.

[0044] like Figure 2 and 3 As shown, the central distributor 1 is located at the center of multiple extraction workstations 2, and is connected to each extraction workstation 2 to supply water and / or gas to each extraction workstation 2, while also receiving extract from each extraction workstation 2. The central distributor 1 is rotatable along its vertical axis.

[0045] The number of extraction workstations 2 is multiple, for example, 12. Each extraction workstation can use the same single raw material, the same mixed raw material, different single raw materials, or different mixed raw materials to achieve flexible synchronous extraction. The extraction workstations 2 are evenly distributed along the circumference and can rotate at a uniform speed around the central distributor 1. The central distributor 1 and each extraction workstation 2 rotate together at the same speed to ensure that the connection between the central distributor 1 and each extraction workstation remains unchanged, thereby achieving continuous and flexible extraction of tea or coffee.

[0046] like Figure 4 As shown, the extraction workstation 2 has a removable top cover 21. When one of the extraction workstations 2 rotates to be directly below the feeding section 3, the top cover 21 is removed. At this time, raw materials such as tea leaves and coffee beans can be added to the extraction workstation 2 through the feeding section 3. Then, the top cover 21 is closed on top of the extraction workstation 2 to achieve a sealing effect. The extraction workstation 2 has a removable bottom cover 22 for discharging the extraction residue produced after extraction. When the extraction workstation 2 that needs to discharge the extraction residue rotates to be directly above the discharge section 4, the extraction residue is transported away and collected by the discharge section 4 located below the extraction workstation 2 for unified processing.

[0047] The inside of the extraction workstation 2 has a first supply part 23 and a second supply part 24, which are in fluid communication through a supply pipe 25. The first supply part 23 is located at the top of the inside of the extraction workstation 2 and can be in the form of a spray ball, so as to spray the raw materials such as tea leaves or coffee beans inside the extraction workstation 2. Since the spray ball is a sphere, the spray holes are distributed on the surface of the sphere, so the raw materials can be sprayed with the spray range of the cross-sectional area of the inside of the extraction workstation, so as to ensure uniform contact between the water and the raw materials. The second supply part 24 is located below the first supply part 23 and is a porous pipe located in the center of the inside of the extraction workstation. Preferably, at least a part of the porous pipe is immersed in the raw materials at the bottom of the inside of the extraction workstation. Since the holes on the porous pipe are distributed at different heights of the pipe body, the raw materials can also be watered with the spray range of the cross-sectional area of the inside of the extraction workstation. In addition, since a part of the water outlet holes of the second supply part 24 are immersed in the lower layer of the raw materials, not only the upper layer of the raw materials can be watered, but also the lower layer of the raw materials can be watered, that is, the layered watering of the raw materials is realized, so as to ensure the uniform contact between the water and the raw materials to realize the simultaneous extraction of the components of the raw materials, avoiding over-extraction or under-extraction.

[0048] Preferably, the shape of each extraction workstation 2 can be cylindrical to facilitate uniform spraying inside the extraction workstation, but the shape is not limited thereto. Preferably, the capacity of each extraction workstation 2 is the same to provide completely consistent taste of the extraction liquid when extracting the same raw materials, but the capacity is not limited thereto. In addition, preferably, the axis of each extraction workstation 2 extends in the vertical direction to facilitate uniform spraying inside the extraction workstation and uniform laying of the raw materials inside the extraction workstation, but the arrangement angle is not limited thereto.

[0049] The central distributor 1 has multiple distribution pipes 11 connected radially along its circumference. Each distribution pipe 11 is connected to a supply pipe 25 located inside the corresponding extraction workstation 2, between the first supply section 23 and the second supply section 24. Preferably, a first control valve 231 is provided on the supply pipe 25 between the first supply section 23 and the distribution pipe 11, and a second control valve 241 is provided on the supply pipe 25 between the second supply section 24 and the distribution pipe 11. Depending on the extraction requirements, the following operations can be performed: When the first control valve 231 is open and the second control valve 241 is closed, the water distributed by the distribution pipe 11 can only enter the first supply section 23, thereby achieving spraying of the raw material in the extraction workstation; when the first control valve 231 is closed and the second control valve 241 is open, the water distributed by the distribution pipe 11 can only enter the second water supply section 21, thereby achieving stratified water addition of the raw material in the extraction workstation; when both the first control valve 231 and the second control valve 241 are open, the water distributed by the distribution pipe 11 can simultaneously enter the first supply section 23 and the second supply section 24, allowing for simultaneous spraying and stratified water addition of the raw material; when both the first control valve 231 and the second control valve 241 are closed, water cannot be added to the raw material in the extraction workstation. After extraction is completed, the extract is discharged from the bottom of the extraction workstation through a pipe.

[0050] Preferably, the distribution pipe 11 can be made of a high-temperature resistant material, so that water generated by the hot water tank with a wide temperature range (0-140°C) can be delivered to each extraction workstation 2 through the central distributor 1.

[0051] Furthermore, since the air (oxygen) present in the extraction station may oxidize the raw materials during extraction, thereby affecting the flavor of the extract, if it is necessary to remove the air (oxygen) from the extraction station during the extraction process, a gas, such as carbon dioxide or nitrogen, can be injected into the extraction station to expel the air (oxygen). Preferably, injecting a gas with a density greater than that of air is more beneficial for expelling the air from the extraction station.

[0052] Therefore, the distribution pipe 11 can distribute not only water to the extraction workstation 2, but also gas to the extraction workstation. Preferably, the distribution pipe 11 may include a water supply distribution pipe 111 and a gas supply distribution pipe 112 connected in parallel. The water supply distribution pipe 111 is equipped with a third control valve 113 to open or close the water supply distribution pipe 111, while the gas supply distribution pipe 112 is equipped with a fourth control valve 114 to open or close the gas supply distribution pipe 112. If it is necessary to remove air (oxygen) from the extraction workstation before extraction, the raw material must first be loaded into the extraction workstation. Simultaneously, the third control valve 113 must be closed and the fourth control valve 114 opened. At this time, both the first supply unit 23 and the second supply unit 24 can be used to supply gas. By purging the first supply unit (e.g., a spray ball) and / or the second supply unit (a porous tube), the gas is injected from top to bottom into the extraction workstation through the first supply unit 23. The existing air (oxygen) in the extraction workstation is then discharged from the exhaust pipe at the bottom of the extraction workstation, thereby achieving gas replacement within the extraction workstation and preventing the raw material from being oxidized before extraction. Furthermore, the gas can be purged through the second supply unit 24 (a porous tube) to form a dry component for uniform distribution before extraction. Moreover, during the extraction process, the gas can also be purged through the porous tube to agitate the raw material, achieving more complete extraction.

[0053] After inflation, water can be supplied to extraction workstation 2. At this time, the fourth control valve 114 can be closed and the third control valve 113 can be opened to extract the raw material of the extraction workstation.

[0054] In addition, the bottom of the extraction workstation is provided with an extractant discharge port 26 and a gas discharge port 27. The extractant discharge port 26 is connected to the central distributor 1 through a pipe, and a fifth control valve 261 is also provided on the pipe connected to the extractant discharge port 26 to control the discharge of the extractant. The gas discharge port 27 is connected to a gas source (not shown in the figure), and a sixth control valve 271 is provided on the pipe connected to the gas discharge port 27. When it is necessary to discharge air (oxygen) from the extraction workstation, the sixth control valve 271 is opened to facilitate the discharge of gas; when the extractant becomes blocked during the discharge process, the sixth control valve 271 can be opened, and gas can be supplied to the extraction workstation 2 through the gas discharge port 27 to provide a backwashing effect and alleviate the blockage problem.

[0055] Especially Figure 3 As shown, the present invention also provides a continuous extraction method, wherein the continuous extraction device includes N extraction workstations, meaning that it includes a total of N workstations. Here, N is a natural number, for example, N = 12. The workflow of the continuous extraction device in the first embodiment is as follows (for ease of explanation, the N extraction workstations are numbered from 1 to N):

[0056] 1. When the No. 1 extraction workstation is located directly below the feeding section 3 (i.e., No. 1 workstation), open the top cover of the No. 1 extraction workstation, pour the raw material from the feeding section 3 into the No. 1 extraction workstation, and close the top cover 21 of the extraction workstation.

[0057] 2. All extraction workstations move to the next workstation simultaneously. At this time, extraction workstation No. 1 moves to workstation No. 2 and the central distributor starts adding water and / or gas to extraction workstation No. 1 according to production needs to start the extraction process. Extraction workstation No. 2 moves to workstation No. 1 and repeats the feeding process of extraction workstation No. 1. Other extraction workstations follow the same pattern.

[0058] 3. When extraction workstation 1 moves to workstation N-2, extraction is complete;

[0059] 4. When extraction station 1 moves to extraction station N-1, the extract is discharged from the extract outlet at the bottom of the extraction station and flows back to the extract recovery device below the central distributor.

[0060] 5. When extraction station 1 moves to extraction station N, slag removal and cleaning of the extraction station are performed. Slag removal occurs at extraction station N; the bottom cover of the extraction station is opened, and the extraction slag is discharged by gravity and transferred and collected via the conveyor belt of discharge section 4. After discharge, a cleaning procedure is performed to ensure complete cleanliness of the extraction station. Then, the bottom cover is closed, and the extraction station rotates to extraction station 1 for the next extraction cycle.

[0061] It should be noted that each extraction workstation moves at a preset speed and stops at each workstation at preset intervals. The speed and dwell time of the extraction workstation can be set separately for different raw materials and different extraction production requirements.

[0062] Furthermore, the total extraction time of all extraction workstations is equal to the rotation time from workstation 2 to workstation N-1. In another embodiment, if the extraction time needs to be shortened, the extraction workstations can also complete the extraction earlier, for example, at workstation N-3. Therefore, the rotational speed of the extraction workstations in the circumferential direction depends on the extraction time of one extraction workstation and the total number of extraction workstations "N". The size and number N of the extraction workstations can be determined based on the extraction volume.

[0063] This embodiment uses a "carousel" type extraction device, which can be applied not only to the extraction of tea and coffee, but also to the extraction of other raw materials, in order to achieve continuous and flexible extraction.

[0064] This embodiment has at least the following beneficial effects:

[0065] 1. Each extraction workstation is a separate extraction unit. During rotation, each extraction unit will perform raw material supply, extraction at different temperatures and / or pressures, extraction liquid discharge, and extraction residue unloading.

[0066] 2. Extraction time is determined by rotation speed and batch size (within a given equipment specification). The number of extraction workstations and their dimensions (height, diameter) will be determined based on extraction requirements and capacity, thus responding to different production needs.

[0067] 3. The supply section at the top of the extraction workstation can supply different raw materials, such as tea leaves, coffee beans, or mixed materials, to achieve flexible extraction.

[0068] Second embodiment

[0069] Finally, as Figure 5 As shown, the present invention also provides a second embodiment. The main difference between the second embodiment and the first embodiment is that the central distributor 1a has at least two independent fluid channels to supply fluids of different temperatures to different extraction workstations, thereby enabling each extraction workstation to perform flexible extraction with different raw materials and / or under different temperature conditions.

[0070] Specifically, the first raw material needs to be added to extraction workstations 1-4 using different feeding sections, the second raw material to extraction workstations 5-8, and the third raw material to extraction workstations 9-12. Therefore, the central distributor should have at least three independent fluid channels (not shown in the figure). The first fluid channel has a first inlet 11a and a first outlet 21a at both ends, the second fluid channel has a second inlet 12a and a second outlet 22a at both ends, and the third fluid channel has a third inlet 13a and a third outlet 23a at both ends. Each inlet is connected to a water source supplying different temperatures, thereby discharging water of the corresponding temperature to its corresponding outlet to supply water to the extraction workstation containing the corresponding raw material, thus completing the extraction process.

[0071] Preferably, there is a predetermined distance between each pair of fluid channels to avoid heat conduction between the fluid channels, which could affect the temperature of the supplied water. The channels can be filled with gas or with insulating material.

[0072] Optionally, the three fluid channels can be in the form of a sleeve, for example, the first fluid channel is concentrically sleeved outside the second fluid channel, and the second fluid channel is concentrically sleeved outside the third fluid channel. Insulating material can be provided between the channels.

[0073] It should be noted that the arrangement of the multiple fluid channels is not limited to this, as long as each channel can be independent of the others.

[0074] This embodiment adds a "rainbow" type central distributor to the "carousel" type extraction equipment, which can not only load different raw materials into specific extraction workstations, but also flexibly extract them at different pressures and / or different temperatures.

[0075] In summary, the beneficial effects of this invention are as follows: The continuous extraction device of this invention has multiple functions. Compared with traditional extraction devices, this invention can simultaneously and flexibly extract different raw materials at different pressures and / or temperatures. Therefore, the device of this invention can produce a wider range of flavors, such as cold brew, hot brew, and espresso, etc. Furthermore, the device of this invention can achieve compact extraction of raw materials over a wide temperature range, and can perform air displacement extraction, pressurized extraction, and uniform water addition extraction to ensure uniform extraction of raw materials, reduce concerns about oxidation during extraction, and prevent component blockage during extract discharge. Moreover, reduced manual labor is another advantage, as it eliminates the need for manual loading and unloading of raw materials; the automatic control system ensures the extraction process operates under stable conditions.

[0076] In the description of this invention, the term "a plurality of" refers to two or more. Unless otherwise explicitly defined, the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the 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 the invention. The terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0077] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0078] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A continuous extraction apparatus, characterized in that, include: Multiple extraction workstations are evenly distributed along the circumference; A central distributor, located at the center of the plurality of extraction workstations and capable of rotating with each extraction workstation, is in fluid communication with each extraction workstation and is used to supply water and / or gas to the extraction workstations and to receive extract from each extraction workstation; and The feeding section is located above one of the extraction workstations and is used to supply raw materials to the extraction workstations.

2. The continuous extraction apparatus according to claim 1, characterized in that, The central distributor has at least two independent fluid channels, each fluid channel being in fluid communication with a portion of the extraction workstations. Each fluid channel is used to deliver water at different temperatures and / or gas at different pressures.

3. The continuous extraction apparatus according to claim 1 or 2, characterized in that, The raw materials in each extraction workstation are the same single raw material, the same mixed raw material, different single raw materials, or different mixed raw materials.

4. The continuous extraction apparatus according to claim 1 or 2, characterized in that, The extraction workstation has a first supply section and a second supply section in its central part. The first supply section is located above the second supply section and the first and second supply sections are fluidly connected through a supply pipe.

5. The continuous extraction apparatus according to claim 4, characterized in that, The first supply unit is a spray ball, and the second supply unit is a porous tube. The porous tube is arranged vertically and at least a portion of the porous tube extends into the raw material at the bottom of the inner side of the extraction workstation.

6. The continuous extraction apparatus according to claim 4, characterized in that, The central distributor has multiple distribution pipes connected radially along its circumference, and each distribution pipe is connected to the supply pipe inside the corresponding extraction workstation.

7. The continuous extraction apparatus according to claim 6, characterized in that, The multiple distribution pipes connect the fluid channels in the central distributor to the corresponding extraction workstations.

8. The continuous extraction apparatus according to claim 6, characterized in that, The distribution pipe is made of a high-temperature resistant material.

9. The continuous extraction apparatus according to claim 4, characterized in that, A first control valve is installed on the supply pipeline between the first supply department and the distribution pipeline, and a second control valve is installed on the supply pipeline between the second supply department and the distribution pipeline.

10. The continuous extraction apparatus according to claim 6, characterized in that, The distribution pipeline includes a water supply distribution pipeline and a gas supply distribution pipeline connected in parallel. The water supply distribution pipeline is equipped with a third control valve for opening or closing the water supply distribution pipeline, and the gas supply distribution pipeline is equipped with a fourth control valve for opening or closing the gas supply distribution pipeline.

11. The continuous extraction apparatus according to claim 1 or 2, characterized in that, The bottom of the extraction workstation is provided with an extraction liquid discharge port, which is connected to the central distributor through a pipe. A fifth control valve is also provided on the pipe connected to the extraction liquid discharge port to control the discharge of the extraction liquid.

12. The continuous extraction apparatus according to claim 1 or 2, characterized in that, The bottom of the extraction workstation is equipped with a gas exhaust port, which is also connected to a gas source for backwashing the bottom of the extraction workstation. A sixth control valve is installed on the pipe connected to the gas exhaust port to control the gas discharge.

13. The continuous extraction apparatus according to claim 1 or 2, characterized in that, It also includes a discharge section, which is located below one of the extraction workstations and is used to carry and transport the extraction residue discharged from the extraction workstation.

14. The continuous extraction apparatus according to claim 2, characterized in that, There is a preset distance between each pair of fluid channels.

15. The continuous extraction apparatus according to claim 2, characterized in that, The fluid channels are nested within each other.

16. A continuous extraction method using the continuous extraction apparatus according to any one of claims 1 to 15, wherein, The number of extraction workstations is N, and the working positions of the N extraction workstations are N workstations. The feature is that it includes the following steps: (1) When the No. 1 extraction workstation is located directly below the No. 1 workstation of the feeding section, open the top cover of the No. 1 extraction workstation, pour the raw material from the feeding section into the No. 1 extraction workstation, and close the top cover of the No. 1 extraction workstation. (2) All extraction workstations move to the next workstation at the same time. At this time, extraction workstation No. 1 moves to workstation No. 2 and the central distributor starts to add water and / or gas to extraction workstation No. 1 according to production needs to start the extraction process; extraction workstation No. 2 moves to workstation No. 1 and repeats the feeding process of extraction workstation No.

1. (3) When extraction workstation 1 moves to workstation N-2, extraction is complete; (4) When the No. 1 extraction workstation moves to the N-1 workstation, the extract liquid is discharged from the extract liquid discharge port at the bottom of the extraction workstation and flows back to the extract recovery device below the central distributor. (5) When extraction station No. 1 is moved to extraction station No. N, the slag discharge and cleaning work of the extraction station shall be carried out. (6) Extraction workstation 1 returns to workstation 1 and repeats steps (1)-(5), and so on for other extraction workstations.

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