Extraction liquid recovery device

Abstract

The utility model provides an extraction liquid recovery device. The extraction liquid recovery device comprises an extraction tank, a filter box, a magnetic filter assembly and a liquid storage tank, the extraction tank is provided with an overflow pipe; a first baffle is arranged in the filter box to divide the internal space of the filter box into a buffer area and a filter area, the extract liquor overflowing from the overflow pipe enters the buffer area, and the first baffle is provided with an overflow port, so that the extract liquor in the buffer area can overflow to the filter area through the overflow port. The magnetic filtering assembly is arranged in the filtering area and used for adsorbing metal particles of the extracting solution in the filtering area. And the liquid storage tank is connected with the filtering area and is used for recycling the extract filtered by the filtering area. According to the technical scheme, through the overflow pipe of the extraction tank, extraction liquid can flow into the filter box, and metal particles are adsorbed by the magnetic filter assembly in the buffer area. By arranging a liquid outlet pipe connected with the filtering box, the extraction liquid filtered by the filtering area can be recycled.

Description

Technical Field

[0001] The present application relates to the field of extraction technology, and in particular to an extraction liquid recovery device. Background Art

[0002] At present, wet-process diaphragm products are increasingly favored by the market. The production process of wet-process diaphragms involves an extraction process. In the extraction process, a low-boiling, volatile extractant is used to elute the pore-forming agent, so that the diaphragm forms micropores. The extractant extracts the pore-forming agent in the base membrane. In this process, the base membrane operation will also bring other foreign impurities into the extraction tank.

[0003] In addition, the production line speed is high, and the roller shaft will wear during the operation of the roller. The metal particles and foreign matter produced by the wear will all fall into the extract and cannot be removed. In addition, in the process of dealing with film breakage and rewinding in the extraction tank, film fragments will also be generated, and the film threading rope will also drop some fine fiber impurities in the tank. These impurities in the liquid storage tank can easily cause bad black spots on the base film in the extract and cause product degradation. Based on this, it is necessary to provide an effective recovery device to recover the extract containing more impurities to improve the utilization rate of the extract. Utility Model Content

[0004] The purpose of the present application is to provide an extract recovery device to recover the extract and reduce the content of impurities in the extract.

[0005] The embodiment of the present application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides an extract recovery device, comprising an extraction tank, a filter box, a magnetic filter assembly, and a liquid storage tank. The extraction tank has an overflow pipe; a first baffle is provided in the filter box to separate the internal space of the filter box into a buffer zone and a filter zone, the extract overflowing from the overflow pipe enters the buffer zone, and the first baffle is provided with an overflow port so that the extract in the buffer zone can overflow to the filter zone through the overflow port. The magnetic filter assembly is provided in the filter zone, and is used to adsorb metal particles in the extract in the filter zone. The liquid storage tank is connected to the filter zone, and is used to recover the extract filtered in the filter zone.

[0007] In the above technical solution, the extract can flow into the filter box through the overflow pipe of the extraction tank, and the metal particles are adsorbed by the magnetic filter assembly in the buffer zone. By dividing the filter box into a buffer zone and a filter zone, and arranging the magnetic filter assembly in the filter zone, the flow rate of the extract in the filter zone can be slowed down, thereby better adsorbing the metal particles in the extract. By arranging a liquid outlet pipe connected to the filter box, the extract filtered in the filter zone can be recovered.

[0008] In some optional embodiments, the magnetic filtration assembly includes a magnetic member and a sleeve sleeved outside the magnetic member, the sleeve is fixedly connected to the side wall of the filter box, the magnetic member is detachably disposed in the sleeve, and the magnetic filtration assembly is configured so that the sleeve is located in the magnetic field generated by the magnetic member so that the metal particles in the extract in the filtration area are adsorbed on the sleeve.

[0009] By adopting the magnetic filter assembly structure provided by the above technical solution, metal particles are adsorbed on the outside of the sleeve, and after the magnetic member in the sleeve is taken out, the metal particles outside the sleeve can be cleaned more conveniently.

[0010] In some optional embodiments, a through hole is provided on the side wall of the filter box corresponding to the sleeve, and one end of the sleeve connected to the side wall has an opening, the opening is aligned with and connected to the through hole, and the other end of the sleeve extends away from the through hole and in a horizontal direction; a cover plate is provided on the outer side of the filter box, the magnetic member is threadedly connected to the cover plate, and the cover plate is detachably connected to the filter box.

[0011] In the above technical solution, the magnetic component can be easily removed from the sleeve to clean the metal particles on the sleeve.

[0012] In some optional embodiments, it further includes a cleaning nozzle disposed in the filtering area, wherein the water outlet of the cleaning nozzle faces the sleeve.

[0013] In the above technical solution, the metal particles on the sleeve are cleaned by providing a cleaning nozzle.

[0014] In some optional embodiments, a sewage outlet is provided at the bottom of the filtration area, and the sewage outlet is connected to the wastewater treatment system through a pipeline.

[0015] In some optional embodiments, the first baffle is vertically arranged, and the height of the first baffle is lower than the height of the filter box to form the overflow port.

[0016] In some optional embodiments, the filter box is further provided with a second baffle, which is located on the side of the first baffle away from the buffer zone, and a channel for the extraction liquid to pass through is formed between the second baffle and the bottom wall of the filter box; the magnetic filtration component is arranged on the side of the second baffle facing away from the first baffle.

[0017] In the above technical solution, by setting the second baffle, the extraction liquid enters the filtration area from below, and the subsequent extraction liquid can push the upper extraction liquid to move, thereby allowing the metal particles in the extraction liquid to be better adsorbed by the magnetic filtration component.

[0018] In some optional embodiments, a circulation pump is further included, wherein the water inlet of the circulation pump is connected to the filtration zone through a pipeline, and the water outlet of the circulation pump is connected to the buffer zone through a pipeline, so that the extract in the filtration zone enters the buffer zone.

[0019] In the above technical solution, a circulating pump is provided to allow the extract to enter the filtration area for filtration multiple times, which can better remove the metal particles in the extract.

[0020] In some optional embodiments, the overflow pipe includes a first branch pipe and a second branch pipe connected in parallel, and the first branch pipe and the second branch pipe are sequentially provided with valves and filters along the flow direction of the extract.

[0021] In the above technical solution, the first branch pipe and the second branch pipe can be used alternately, which is convenient for cleaning the overflow pipe.

[0022] In some optional embodiments, it also includes an automatic processor and a liquid level monitoring device and a liquid pump that are both connected to the automatic processor signal, the liquid level monitoring device is arranged in the filtration area; the liquid pump is connected to the filtration area via a pipeline with a filter component, and the liquid pump is also connected to the liquid storage tank via a pipeline to pump the extraction liquid in the filtration area into the liquid storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of the structure of the extraction liquid recovery device provided in an embodiment of the present application;

[0025] Figure 2 This is a schematic diagram of the installation of the magnetic filtration assembly provided in an embodiment of the present application.

[0026] Icons: 100-extraction tank; 200-filter box; 210-buffer zone; 220-filtration zone; 230-first side wall; 240-second side wall; 250-cleaning nozzle; 300-magnetic filter assembly; 310-sleeve; 320-magnetic part; 330-cover plate; 340-handle; 410-first baffle; 420-second baffle; 500-circulation pump; 600-overflow pipe; 610-first branch pipe; 620-second branch pipe; 630-valve; 640-filter screen; 700-automatic processor; 800-wastewater treatment system; 910-liquid pump; 920-liquid storage tank. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of this application, it should be noted that the terms "center", "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0031] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it 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, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] The present application provides an extract recovery device that can recover the extract in the extraction tank 100 to reduce production costs, and remove impurities (including metal particles and other types of impurities) in the extract so that the extract is reused without reducing product quality.

[0034] like Figure 1 As shown, the extract recovery device provided by the present application includes an extraction tank 100, a filter box 200, a magnetic filter assembly 300 and a liquid storage tank 920. Among them, the extraction tank 100 is provided with an extract, which will enter the extraction tank 100 during the production of the diaphragm to extract the pore-forming agent. The extraction tank 100 has an overflow pipe 600, through which the extract in the extraction tank 100 can flow into the filter box 200. The liquid storage tank 920 is connected to the filter box 200, and the liquid storage tank 920 is used to recover the extract filtered by the filter area 220. Therefore, the extract can be sent to the liquid storage tank 920 for storage after being processed in the filter box 200, and the extract stored in the liquid storage tank 920 is sent back to the extraction tank 100 when it is needed. The processing of the extract includes removing the metal particles mixed in the extract through the magnetic filter assembly 300. The embodiment of the present application has no limitation on the location of the overflow pipe 600 , and the overflow pipe 600 can be disposed at a suitable height position of the extraction tank 100 according to actual needs.

[0035] Further, in some embodiments, a first baffle 410 is provided in the filter box 200, and the first baffle 410 divides the internal space of the filter box 200 into a buffer zone 210 and a filter zone 220, and the first baffle 410 is provided with an overflow port, so that the extract in the buffer zone 210 can enter the filter zone 220 through the overflow port for filtration. In some embodiments, the first baffle 410 is arranged vertically, and the height of the first baffle 410 is lower than the height of the top of the filter box 200, so that an overflow port is formed at the top of the first baffle 410, so that the extract between the buffer zone 210 and the filter zone 220 can flow through the top of the first baffle 410. The magnetic filter assembly 300 is arranged in the filter zone 220 to adsorb metal particles in the extract in the filter zone 220. In some embodiments of the present application, the filter box 200 can be a metal structural member, such as 304 stainless steel, or a structural member of other materials. There is no limitation on the size of the filter box 200 as long as it can meet production needs. In one embodiment, the filter box 200 has a width of about 1.0 m and a height of about 0.8 to 2.0 m.

[0036] The extract flowing out through the overflow pipe 600 enters the buffer zone 210, and then enters the filtration zone 220 through the top of the first baffle 410. The buffer zone 210 can buffer the extract to slow down the flow rate of the extract in the filtration zone 220, so that the metal particles in the extract can be better adsorbed by the magnetic filtration component 300.

[0037] In some embodiments, the filter box 200 is further connected to a second baffle 420, which is located on the side of the first baffle 410 facing away from the buffer zone 210, and the magnetic filter assembly 300 is disposed on the side of the second baffle 420 facing away from the first baffle 410, and a channel for the extract to pass through is formed between the lower end of the second baffle 420 and the bottom of the filter box 200. That is, when the extract enters the filter zone 220 from the buffer zone 210 through the first baffle 410, it will enter the area where the magnetic filter assembly 300 is located from the lower end of the second baffle 420, and then move upward, so that the metal particles in the extract can be better adsorbed by the magnetic filter assembly 300. In some embodiments, the second baffle 420 is disposed vertically, and the top of the second baffle 420 is flush with the top of the filter box 200.

[0038] The magnetic filter assembly 300 uses magnetic force to adsorb metal particles in the extract to reduce the content of metal particles in the extract. In some embodiments, the magnetic filter assembly 300 includes a magnetic member 320, through which a magnetic field can be generated, and then the metal particles are adsorbed to the magnetic filter assembly 300, thereby achieving the effect of removing metal particles. In actual production, the metal particles in the extract are relatively small and are easy to move under the action of the magnetic field, and then adsorbed to the magnetic filter assembly 300 under the magnetic field generated by the magnetic member 320. By regularly cleaning the metal particles adsorbed by the magnetic filter assembly 300, the magnetic filter assembly 300 can maintain a good adsorption force on the metal particles.

[0039] In the present application, there is no limitation on the way in which the magnetic member 320 generates magnetic force. In some embodiments, the magnetic member 320 may be a permanent magnet, and the metal particles are adsorbed by the magnetic force of the permanent magnet itself. In other embodiments, the magnetic member 320 may also be an electromagnet; that is, a magnetic field is generated by energizing. In the embodiment in which the magnetic member 320 is an electromagnet, although the structure is relatively complex, the strength of the magnetic field can be changed to meet different needs.

[0040] Further, in some embodiments, in order to facilitate the cleaning of metal particles adsorbed on the magnetic filter assembly 300 so that the magnetic filter assembly 300 maintains a good attraction for the metal particles, the magnetic filter assembly 300 also includes a sleeve 310, which is located outside the magnetic member 320. Under the action of the magnetic force, the metal particles will move toward the magnetic member 320, and due to the existence of the sleeve 310, the metal particles will adhere to the surface of the sleeve 310 to achieve the adsorption of the metal particles. When cleaning the metal particles on the surface of the sleeve 310, the sleeve 310 and the metal particles can be placed outside the magnetic field by removing the magnetic member 320 or other methods, so as to facilitate the cleaning of the metal particles from the surface of the sleeve 310. For example, when the magnetic member 320 is a permanent magnet, the permanent magnet can be removed from the sleeve 310 and then the impurities on the surface of the sleeve 310 can be cleaned; when the magnetic member 320 is an electromagnet, the electromagnet can be powered off and then the impurities on the surface of the sleeve 310 can be cleaned. In some embodiments, a sewage outlet is further provided at the bottom of the buffer zone 210 , and the sewage outlet is connected to a pipe connected to the wastewater treatment system 800 so as to send the wastewater after cleaning the sleeve 310 to the wastewater treatment system 800 for treatment.

[0041] In the above embodiment, the sleeve 310 can be a metal structural part or a non-metallic structural part such as plastic. The size of the sleeve 310 should satisfy: when the sleeve 310 is in the magnetic field generated by the magnetic part 320, the metal particles can be adsorbed on the surface of the sleeve 310. The technical personnel in this field can adjust the size of the sleeve 310 according to the actual situation. The present application has no restrictions on the shape of the sleeve 310. For example, the cross-sectional area of ​​the sleeve 310 can be rectangular, circular, or other shapes.

[0042] It is not difficult to understand that the sleeve 310 is a tubular structure, and at least one end thereof has an opening for the magnetic member 320 to be taken in and put out. In some embodiments, the side wall of the filter box 200 is provided with a through hole, and the opening at one end of the sleeve 310 is docked with the through hole of the side wall of the filter box 200, that is, the sleeve 310 is aligned with the through hole and connected to the through hole. Further, the sleeve 310 is sealed at the connection position with the through hole to prevent leakage of the extract. The other end of the sleeve 310 extends horizontally in a direction away from the through hole. In some embodiments, the opening at one end of the sleeve 310 away from the through hole is closed. Furthermore, the sleeve 310 is located inside the filter box 200, that is, a cavity independent of the internal space of the filter box 200 is formed inside the filter box 200 through the sleeve 310, and the extraction liquid inside the filter box 200 is in contact with the sleeve 310, so that impurities in the extraction liquid can be attached to the surface of the sleeve 310 under the action of the magnetic force generated by the magnetic part 320, and the extraction liquid will not enter the interior of the sleeve 310 and contact the magnetic part 320. When cleaning the adsorbed impurities, it is only necessary to clean the impurities on the surface of the sleeve 310.

[0043] Further, the way to close the opening of the sleeve 310 at one end away from the through hole of the filter box 200 may be to connect a separate plate-like structure or a structure of other shapes to the end of the sleeve 310 to close the opening of the sleeve 310, or the other end of the sleeve 310 may contact the other side wall of the filter box 200, and the end of the sleeve 310 may be closed by the side wall of the filter box 200. For example, in some embodiments, the filter box 200 may include a first side wall 230 and a second side wall 240, wherein the first side wall 230 of the filter box 200 is provided with a through hole, the opening of one end of the sleeve 310 is butted against and sealed with the through hole, and the other end is connected to the second side wall 240 of the filter box 200 and closed by the second side wall 240. The first side wall 230 and the second side wall 240 may be opposite side walls or adjacent side walls.

[0044] In the above-mentioned embodiment in which one end of the sleeve 310 is connected to the first side wall 230 and the other end is connected to the second side wall 240, the sleeve 310 is basically arranged horizontally; in some other embodiments, the sleeve 310 can also be basically arranged vertically, that is, the sleeve 310 basically extends in the vertical direction, and the magnetic member 320 is taken out from the top of the filter box 200.

[0045] In one embodiment, the sleeve 310 is a tubular structure with an outer diameter of 10 mm. The sleeve 310 is horizontally arranged and one end is connected to the first side wall 230 of the filter box 200, and the other end is connected to the second side wall 240 of the filter box 200, wherein the first side wall 230 and the second side wall 240 are two side walls arranged opposite to each other in the filter box 200. Figure 2As shown, a through hole docking with an opening at one end of the sleeve 310 is provided on the first side wall 230, and a cover plate 330 is detachably connected to the outer side of the first side wall 230, and the end of the magnetic member 320 has a threaded section with a length of 1 cm, through which the magnetic member 320 is fixedly connected to the cover plate 330. Furthermore, a handle 340 is also connected to the cover plate 330 to facilitate the removal of the cover plate 330 and the magnetic member 320.

[0046] In some embodiments, the filter area 220 is provided with a plurality of magnetic filter components 300, and the plurality of magnetic filter components 300 are preferably evenly distributed. For example, six evenly distributed magnetic filter components 300 may be connected to the cover plate 330. Similarly, the filter area 220 may also be provided with a plurality of cover plates 330.

[0047] In some embodiments, in order to clean the impurities adhered to the sleeve 310, a cleaning nozzle 250 is also provided, and the water outlet of the cleaning nozzle 250 is arranged toward the sleeve 310 to flush the impurities on the surface of the sleeve 310. It is not difficult to understand that when the cleaning nozzle 250 is used to clean the sleeve 310, the magnetic member 320 can also be taken out so that more impurities can be cleaned. Further, the cleaning nozzle 250 is provided with a plurality of, such as 9, 9 cleaning nozzles 250 are evenly distributed above the filter area 220 in the form of a matrix distribution to flush the sleeve when necessary. Further, the cleaning nozzle 250 can be connected to the filter box 200.

[0048] In some embodiments of the present application, in order to remove more metal particles in the extract, a circulation pump 500 is provided for sending the extract in the filter area 220 back into the buffer area 210. By providing the circulation pump 500, the extract can enter the filter area 220 multiple times to adsorb the metal particles in the extract multiple times. It is not difficult to understand that the water inlet of the circulation pump 500 is connected to the filter area 220 through a pipeline, and the water outlet is connected to the buffer area 210 through a pipeline, so as to realize sending the extract in the filter area 220 to the buffer area 210.

[0049] Since the overflow pipe 600 is used to deliver the extract in the extraction tank 100 into the filter box 200, the extract will pass through the overflow pipe 600. Therefore, in some embodiments, a filter screen 640 is also provided on the overflow pipe 600, and the impurities in the extract are preliminarily filtered through the filter screen 640, wherein the impurities filtered by the filter screen 640 on the overflow pipe 600 include both metal particles and non-metal particles.

[0050] Furthermore, in order to facilitate the cleaning of the filter screen 640 on the overflow pipe 600 without affecting the process of the extract in the extraction tank 100 entering the filter box 200, in some embodiments, the overflow pipe 600 includes a first branch pipe 610 and a second branch pipe 620 connected in parallel, and the first branch pipe 610 and the second branch pipe 620 are sequentially provided with a filter screen 640 and a valve 630 along the flow direction of the extract. Therefore, when cleaning the filter screen 640 of the first branch pipe 610, the valve 630 on the first branch pipe 610 can be closed, so that the extract can only enter the filter box 200 from the second branch pipe 620; similarly, when cleaning the filter screen 640 on the second branch pipe 620, the valve 630 on the first branch pipe 610 can be closed.

[0051] In some embodiments of the present application, a liquid level monitoring component is also provided for monitoring the extract in the filter area 220, so that when there is a lot of extract in the filter area 220, the extract in the filter area 220 can be processed. Further, the extract recovery device also includes an automatic processor 700 and a liquid pump 910, and the liquid pump 910 and the liquid level monitoring component are both connected to the automatic processor 700 by signal, so that when the liquid level monitoring component detects that the liquid level in the filter area 220 reaches a preset value, the automatic processor 700 controls the liquid pump 910 to extract the extract in the filter area 220. Specifically, the liquid pump 910 is connected to the filter area 220 through a pipeline provided with a filter component, and the filter component can adopt a column filter, and the filter element of the column filter adopts a folded precision filter element, which can filter invisible fine impurities.

[0052] The liquid pump 910 is also connected to the liquid storage tank 920 through a pipeline to pump the extract in the filtration area 220 to the liquid storage tank 920. The liquid level monitoring element can be a floating ball commonly used in the art, which is arranged in the buffer area 210. The height of the floating ball can reflect the liquid level of the extract in the buffer area 210. Of course, the extract extracted by the liquid pump 910 can also be sent to the extraction tank 100 for use.

[0053] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An extract recovery device, characterized in that: include: An extraction tank, wherein the extraction tank has an overflow pipe; A filter box, wherein a first baffle is provided in the filter box to separate the internal space of the filter box into a buffer zone and a filter zone, the extract overflowing from the overflow pipe enters the buffer zone, and the first baffle is provided with an overflow port, so that the extract in the buffer zone can overflow to the filter zone through the overflow port; A magnetic filter assembly, the magnetic filter assembly is disposed in the filter area and is used to absorb metal particles in the extract in the filter area; A liquid storage tank is connected to the filtering area and is used to recover the extracted liquid filtered by the filtering area.

2. The extract recovery device according to claim 1, characterized in that: The magnetic filter assembly includes a magnetic part and a sleeve sleeved outside the magnetic part, the sleeve is fixedly connected to the side wall of the filter box, the magnetic part is detachably arranged in the sleeve, and the magnetic filter assembly is configured so that the sleeve is located in the magnetic field generated by the magnetic part, so that the metal particles in the extract in the filtration area are adsorbed on the sleeve.

3. The extract recovery device according to claim 2, characterized in that: The side wall of the filter box is provided with a through hole corresponding to the sleeve, and one end of the sleeve connected to the side wall has an opening, the opening is aligned with and connected to the through hole, and the other end of the sleeve extends away from the through hole and in a horizontal direction; a cover plate is provided on the outside of the filter box, the magnetic member is threadedly connected to the cover plate, and the cover plate is detachably connected to the filter box.

4. The extract recovery device according to claim 2, characterized in that: It also includes a cleaning nozzle arranged in the filtering area, and the water outlet of the cleaning nozzle faces the sleeve.

5. The extract recovery device according to claim 4, characterized in that: A sewage outlet is provided at the bottom of the filtration area, and the sewage outlet is connected to the wastewater treatment system through a pipeline.

6. The extract recovery device according to claim 1, characterized in that: The first baffle is vertically arranged, and the height of the first baffle is lower than the height of the filter box to form the overflow port.

7. The extract recovery device according to claim 1, characterized in that: The filter box is also provided with a second baffle, which is located on the side of the first baffle away from the buffer zone, and a channel for the extraction liquid to pass through is formed between the second baffle and the bottom wall of the filter box; the magnetic filter component is arranged on the side of the second baffle away from the first baffle.

8. The extract recovery device according to any one of claims 1 to 7, characterized in that: It also includes a circulation pump, the water inlet of the circulation pump is connected to the filtering area through a pipeline, and the water outlet of the circulation pump is connected to the buffer zone through a pipeline, so that the extract in the filtering area enters the buffer zone.

9. The extract recovery device according to claim 1, characterized in that: The overflow pipe comprises a first branch pipe and a second branch pipe connected in parallel, and the first branch pipe and the second branch pipe are provided with valves and filters in sequence along the flow direction of the extract.

10. The extract recovery device according to claim 1, characterized in that: It also includes an automatic processor and a liquid level monitoring device and a liquid pump both of which are connected to the automatic processor signal. The liquid level monitoring device is arranged in the filtration area; the liquid pump is connected to the filtration area through a pipeline with a filter component, and the liquid pump is also connected to the liquid storage tank through a pipeline to pump the extraction liquid in the filtration area into the liquid storage tank.

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