Self-moving material balance filtration device, extraction kettle containing the device and usage method

Abstract

The present invention discloses a self - moving material balance filtering device, an extraction kettle including the device and a using method. The device includes a circular ring mounting seat and a pressing ring arranged below the circular ring mounting seat. A filtering member is arranged between the circular ring mounting seat and the pressing ring, and a plurality of ball mounting seats are evenly arranged along the circumference on its upper surface. An elastic ball assembly is clamped in the ball mounting seat, and a large ball is arranged in the elastic ball assembly. The filtering device moves up and down driven by the rolling of the large ball, and the filtering member is a filter cloth. The self - moving material balance filtering device provided by the present invention can automatically change with the change of the height of the material in the material basket. It can prevent the free floating of the powdery raw material during the extraction process, avoid the generation of a large number of channel flows caused by the floating and dispersion of the material, improve the extraction effect and product recovery rate, shorten the extraction time and reduce the production cost; the filter cloth can conduct primary filtration on the powdery raw material in the extraction medium, greatly reducing the entry of raw material fine powder into the filter screen or filter plate at the top of the material basket.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid extraction, and particularly to a self-moving material balance filtration device, an extraction kettle containing the device, and a using method thereof. Background Art

[0002] Supercritical carbon dioxide fluid extraction is an efficient and clean chemical extraction and separation technology, which has the advantages of non-toxic, pollution-free, residue-free, high solubility, and easy separation of the extraction medium. The supercritical carbon dioxide fluid extraction and separation process utilizes the property that high-density supercritical carbon dioxide has a large solubility for the target components to be extracted, while the solubility of carbon dioxide at low density is significantly reduced, and the density of carbon dioxide changes with the change of its pressure and temperature. Therefore, extraction and separation are achieved by changing the pressure and temperature of carbon dioxide. Generally, extraction is carried out at higher pressure and lower temperature, and separation is achieved at lower pressure and higher temperature.

[0003] The patent application number CN201720210470.X discloses a high-pressure carbon dioxide extraction device, which includes an extraction kettle and a distributor. The extraction kettle includes a kettle body, a kettle cover, a jacket, and an extraction basket; the kettle body has an extraction cavity, a feed port, a carbon dioxide inlet, and a carbon dioxide outlet communicating with the extraction cavity; the kettle cover is connected to the kettle body; the jacket is wrapped around the outer wall of the kettle body and there is a volume cavity between the jacket and the kettle body, and the jacket is provided with a jacket water self-circulation inlet, a jacket water self-circulation outlet, a jacket water inlet, and a jacket water outlet communicating with the volume cavity; the extraction basket is arranged in the extraction cavity. The distributor has a distribution head and a connecting member. The distribution head is in a barrel shape, and the side wall of the distribution head has a plurality of distribution holes. The distribution head is inserted into the kettle body through the carbon dioxide inlet, the connecting member is connected to the distribution head, and the connecting member has a carbon dioxide inlet pipe, an evacuation pipe, and a sewage discharge pipe communicating with the distribution head.

[0004] However, when using the above extraction device to extract kernel raw materials with high oil content (oil content 40%-60%) such as tea seeds, peanuts, and hemp seeds, due to the very high oil content of the raw materials, the bulk density of the raw materials changes significantly during the extraction process: as the oil in the materials is continuously extracted, the organizational structure of the materials will become increasingly loose, that is, the bulk density of the materials will become smaller and smaller, and more and more powdery raw materials will be in a suspended and freely dispersed state in the carbon dioxide fluid. This state of materials causes a large number of channeling flows inside the extraction basket, resulting in extraction dead angles, uneven and incomplete extraction of the raw materials in the extraction basket. Practice shows that for such raw materials, if the channeling flow is not eliminated, it is very difficult to completely extract the oil from the raw materials even after a long extraction time, which not only prolongs the extraction time but also reduces the product recovery rate, thus significantly increasing the production cost. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a self - moving material balance filtering device with a simple structure and convenient operation, an extraction kettle containing the device, and a usage method. This self - moving material balance filtering device can not only eliminate the free floating and dispersion of powdery raw materials during the extraction process and the resulting channeling, but also greatly shorten the extraction time, improve the product recovery rate, and reduce the production cost.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a self - moving material balance filtering device for a supercritical fluid extraction device, which includes a circular ring mounting seat and a pressing ring arranged below the circular ring mounting seat and detachably connected thereto. A filtering member is arranged between the circular ring mounting seat and the pressing ring.

[0007] Furthermore, a plurality of ball mounting seats are evenly arranged along the circumference on the upper surface of the circular ring mounting seat. Elastic ball assemblies are clamped in the ball mounting seats. Large balls are arranged in the elastic ball assemblies. The self - moving material balance filtering device moves up and down by the rolling of the large balls.

[0008] The height of the self - moving material balance filtering device of the present invention in the basket can automatically change with the height of the material. It can prevent the free floating of powdery raw materials during the extraction process, avoid the generation of a large amount of channeling caused by the floating and dispersion of the material, thereby greatly shortening the extraction time, improving the product recovery rate, and reducing the production cost.

[0009] Preferably, the filtering member is a filter cloth, which can perform primary filtering on the powdery raw materials in the extraction medium, thus greatly reducing the entry of raw material fine powder into the filter screen or filter plate at the top of the extraction basket and reducing the risk of blockage of the filter screen or filter plate at the top of the extraction basket.

[0010] Furthermore, the elastic ball assembly further includes a housing and a ball support arranged inside the housing. Both the housing and the ball support are provided with openings, and the openings of the housing and the ball support are connected by an end cap. A plurality of small balls are arranged on the inner wall of the ball support. A buckle groove is arranged on the end cap. The large ball is installed in the accommodation space formed by the buckle groove and the plurality of small balls.

[0011] Furthermore, the inner side surface of the buckle groove is an inclined spherical surface, and the outer spherical surface of the large ball matches the inclined spherical surface.

[0012] Furthermore, a spring is arranged in the space formed by the inner wall of the housing and the outer wall of the ball support.

[0013] Furthermore, a handle assembly is also arranged on the upper surface of the circular ring mounting seat.

[0014] The present invention also provides an extraction kettle containing the above self - moving material balance filtering device, which includes a kettle body with an extraction cavity, a kettle cover arranged above the kettle body, and a jacket wrapped around the outer wall of the kettle body. There is at least one extraction basket in the extraction cavity. The top of the extraction basket is provided with a basket cover containing a filter net or a filter plate. The self - moving material balance filtering device that can move up and down is arranged in the extraction basket. The rolling of large ball bearings drives the self - moving material balance filtering device to move up and down in the extraction basket.

[0015] The present invention also applies the above self - moving material balance filtering device to the basket in the extraction kettle. The rolling of large ball bearings drives the self - moving material balance filtering device to move up and down in the extraction basket of the extraction kettle, thereby preventing the free floating of powdery raw materials during extraction, avoiding the generation of a large number of channeling flows caused by the floating and dispersion of materials, preventing the phenomenon that supercritical carbon dioxide directly flows upward from the channeling flow area due to the floating and dispersion of materials, prolonging the flow time of supercritical carbon dioxide in the extraction basket, effectively promoting the contact between supercritical carbon dioxide and materials, greatly improving the extraction efficiency, reducing the residual oil rate, and significantly shortening the extraction time.

[0016] Furthermore, the kettle body is also provided with a locking mechanism, a feed port, a carbon dioxide inlet, a carbon dioxide outlet, and a safety device interface that communicate with the extraction cavity. The kettle cover and the kettle body are connected through the locking mechanism. The jacket is provided with a water self - circulation inlet, a water self - circulation outlet, a jacket water inlet, and a jacket water outlet.

[0017] Furthermore, the bottom of the kettle body is connected with a distributor. The distributor includes a distribution head and a connecting member. The distribution head is in the shape of a barrel with one end closed and the other end open, and its side wall is provided with a plurality of distribution holes. The distribution head is inserted into the kettle body through the carbon dioxide inlet. The connecting member is connected with the distribution head through a flow - through pipeline, and a carbon dioxide inlet pipe, an exhaust pipe, and a sewage discharge pipe that communicate with the flow - through pipeline are installed on it. The bottom of the kettle body and the flow - through pipeline are connected through a connecting component.

[0018] The present invention also provides a method for using an extraction kettle containing the above self - moving material balance filtering device, including the following steps:

[0019] 1) Open the basket cover containing a filter net or a filter plate at the top of the extraction basket, pour the material into the extraction basket from the basket opening, then place the self - moving material balance filtering device above the material, install the basket cover; put the extraction basket into the extraction kettle and cover the kettle cover.

[0020] 2) Open the carbon dioxide inlet pipe, so that carbon dioxide is evenly distributed into the extraction cavity through the flow - through pipeline and the distribution holes of the distributor to extract the material in the extraction basket.

[0021] 3) During the material extraction process, the self-moving material balance filtering device moves up and down in the extraction basket under the rolling of large ball bearings. When the material floats up, the self-moving material balance filtering device moves downward to press the material and prevent the material from floating freely. During the extraction process, supercritical carbon dioxide containing grease is output from the carbon dioxide outlet.

[0022] Advantages of the self-moving material balance filtering device, extraction kettle containing the device and its usage method of the present invention:

[0023] (1) The structure of the present invention is simple and easy to use. The self-moving material balance filtering device can move up and down in the extraction basket. When applying the self-moving material balance filtering device in the extraction kettle, it can prevent the free floating of powdery raw materials during the extraction process, avoid the phenomenon of a large number of channel flows caused by the floating and dispersion of materials, greatly shorten the extraction time of the extraction kettle containing the self-moving material balance filtering device, improve the extraction product recovery rate, significantly reduce the production cost, and enable the oil extraction recovery rate of raw materials with an oil content of up to 40%-60% to reach more than 96%, with the residual oil rate only being 1.5-2.5%, and the extraction time being shortened to 2-2.5 h;

[0024] (2) The filter element of the self-moving material balance device of the present invention uses filter cloth. The pressure gradient generated by the upward flow of supercritical carbon dioxide fluid during the extraction process makes the filter cloth present an upward umbrella shape. The umbrella-shaped filter cloth can increase the filtering area and reduce the linear velocity of the fluid; this filter cloth is a soft filter, and its fluttering in the fluid can enable the filter cloth to be self-cleaned and is difficult to be blocked. At the same time, it can effectively prevent the raw material powder from entering the filter screen or filter plate at the top of the extraction basket along with the fluid, greatly reducing the risk of blockage of this filter screen or filter plate. Compared with general hard filtering (tightened wire meshes, sieve plates, etc.) methods, it plays a better anti-blocking effect and a protective role for the filter screen or filter plate at the top of the extraction basket, and can effectively avoid problems such as slow extraction speed and incomplete extraction caused by unsmooth extraction; generally, the fluid in the extraction basket has both longitudinal movement and transverse disturbance. Under the combined action of this fluid movement, the filter cloth in the fluid will be automatically rinsed, making it difficult for the raw material powder to adhere to the filter cloth and cause blockage of the filter cloth, thereby ensuring its permeability. Description of the Drawings

[0025] Figure 1 — is a three-dimensional structural decomposition schematic diagram of the self-moving material balance filtering device of the present invention;

[0026] Figure 2 — is a side view of the self-moving material balance filtering device of the present invention;

[0027] Figure 3 — is a top view of the self-moving material balance filtering device of the present invention;

[0028] Figure 4 — is Figure 3 the cross-sectional view at E-E;

[0029] Figure 5 — is the cross-sectional view of the elastic ball assembly;

[0030] Figure 6 — is the structural schematic diagram of the extraction kettle with the self-moving material balance filtering device of the present invention before extraction;

[0031] Figure 7 — is the structural schematic diagram of the extraction kettle with the self-moving material balance filtering device of the present invention during extraction.

[0032] The above-mentioned reference numerals: 1 - ring mounting seat, 2 - retaining ring, 3 - filter cloth, 4 - bolt, 5 - bracket, 6 - handle, 7 - ball mounting seat, 8 - elastic ball assembly, 81 - large ball, 82 - outer shell, 83 - ball support, 84 - end cover, 85 - small ball, 86 - buckle groove, 87 - accommodation space, 88 - spring, 9 - kettle cover, 10 - kettle body, 11 - extraction chamber, 12 - locking mechanism, 13 - extraction basket, 14 - feed inlet, 15 - carbon dioxide inlet, 16 - carbon dioxide outlet, 17 - safety device interface, 18 - jacket, 19 - water self-circulation inlet, 20 - water self-circulation outlet, 21 - jacket water inlet, 22 - jacket water outlet, 23 - self-moving material balance filtering device, 24 - distribution head, 25 - connecting piece, 26 - circulation pipeline, 27 - carbon dioxide inlet pipe, 28 - drain pipe, 29 - sewage pipe, 30 - flange. Specific Embodiments

[0033] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but these specific implementation schemes do not limit the protection scope of the present invention in any way.

[0034] Embodiment 1

[0035] Refer to Figures 1-4 , the self-moving material balance filtering device for a supercritical fluid extraction device, includes a ring mounting seat 1 and a retaining ring 2 provided below the ring mounting seat 1. A filter cloth 3 is provided between the ring mounting seat 1 and the retaining ring 2. The ring mounting seat 1, the filter cloth 3 and the retaining ring 2 are detachably connected by bolts 4. A handle 6 assembly is also provided on the upper surface of the ring mounting seat 1. The handle 6 assembly includes a bracket 5 and a handle 6 provided on the bracket 5, and is used to put the self-moving material balance filter into or take it out of the extraction basket.

[0036] A number of ball mounting seats 7 are evenly arranged along the circumference on the upper surface of the ring mounting seat 1. The ball mounting seat 7 is connected to the ring mounting seat 1 by bolts 4, and a card slot is provided therein, and an elastic ball assembly 8 is clamped in the card slot.

[0037] See Figure 5 , the elastic ball component 8 includes a housing 82 and a ball carrier 83 disposed inside the housing 82. Both the housing 82 and the ball carrier 83 are provided with openings, and the openings of the housing 82 and the ball carrier 83 are connected by an end cap 84. A number of small balls 85 are provided on the inner wall of the ball carrier 83. A buckle groove 86 is provided on the end cap 84. A large ball 81 is provided in the accommodation space 87 formed by enclosing the buckle groove 86 and the number of small balls 85. The inner side surface of the buckle groove 86 is an inclined spherical surface, and the outer spherical surface of the large ball 81 matches the inclined spherical surface, so that the large ball 81 can roll smoothly in the accommodation space 87 formed by enclosing the buckle groove 86 and the number of small balls 85. The up and down movement of the self-moving material balance filtering device is driven by the rolling of the large ball 81.

[0038] A spring 88 is provided in the space formed by the inner wall of the housing 82 and the outer wall of the ball carrier 83.

[0039] The height of the self-moving material balance filtering device of the present invention in the extraction basket can be automatically changed with the change of the height of the material. It can prevent the free floating of the powdery raw material during the extraction process, avoid the generation of a large number of channel flows caused by the floating and dispersion of the material, thereby greatly improving the extraction efficiency and product recovery rate, shortening the extraction time, and reducing the production cost.

[0040] Embodiment 2

[0041] See Figures 1-7 , an extraction kettle containing a self-moving material balance filtering device includes, from top to bottom, a kettle lid 9, a kettle body 10 having an extraction chamber 11, and a distributor disposed at the bottom of the kettle body 10. A locking mechanism 12 is further provided on the kettle body 10, and it is connected to the kettle lid 9 through the locking mechanism 12. At least one extraction basket 13 (specifically 2 in this embodiment) is provided in the extraction chamber 11 from top to bottom. Adjacent two extraction baskets 13 are connected by bolts 4. A basket lid containing a filter net or a filter plate is provided at the top of the extraction basket 13. The kettle body 10 is further provided with a feed port 14, a carbon dioxide inlet 15, a carbon dioxide outlet 16, and a safety device interface 17 that communicate with the extraction chamber 11.

[0042] The outer wall of the kettle body 10 is wrapped with a jacket 18. The jacket 18 is provided with a water self-circulation inlet 19, a water self-circulation outlet 20, a jacket water inlet 21, and a jacket water outlet 22.

[0043] The distributor includes a distribution head 24 and a connecting member 25. The connecting member 25 is a four-way joint. The distribution head 24 is in the shape of a barrel with one end closed and the other end open, and a plurality of distribution holes are provided on its side wall. The distribution head 24 is inserted into the kettle body 10 through the carbon dioxide inlet 15, and a circulation pipeline 26 is connected to its bottom end. The connecting member 25 is connected to the distribution head 24 through the circulation pipeline 26, and a carbon dioxide inlet pipe 27, an evacuation pipe 28 and a sewage discharge pipe 29 that are connected to the circulation pipeline 26 are installed thereon. One ends of the carbon dioxide inlet pipe 27, the evacuation pipe 28 and the sewage discharge pipe 29 are connected to the circulation pipeline 26 through a four-way joint.

[0044] The bottom of the kettle body 10 and the circulation pipeline 26 are connected through a connecting component. The connecting component is a plurality of flanges 30. A flange 30 is welded to the outer edge of the carbon dioxide inlet 15 of the kettle body 10, and a flange 30 is connected to the outer end of the fluid pipeline. The bottom of the kettle body 10 and the circulation pipeline 26 are connected through the cooperation of the two flanges 30.

[0045] A self-moving material balance filtering device 23 that can move up and down is provided in the extraction basket 13. It includes a circular ring mounting seat 1 and is provided below the circular ring mounting seat 1. A filter cloth 3 is provided between the circular ring mounting seat 1 and the pressing ring 2. The circular ring mounting seat 1, the filter cloth 3 and the pressing ring 2 are detachably connected by bolts 4. A handle 6 assembly is also provided on the upper surface of the circular ring mounting seat 1. The handle 6 assembly includes a bracket 5 and a handle 6 provided on the bracket 5.

[0046] A number of ball mounting seats 7 are evenly provided on the upper surface of the circular ring mounting seat 1 along the circumference. The ball mounting seats 7 are connected to the circular ring mounting seat 124 by bolts 4, and a card slot is provided therein, and an elastic ball assembly 8 is clamped in the card slot.

[0047] The circular ring mounting seat 1 is made of stainless steel, and the specific gravity of stainless steel is greater than the specific gravity of carbon dioxide and the material, so that the gravity of the self-moving material balance filtering device 23 in the extraction basket is greater than the buoyancy it receives, ensuring that it has a downward pressure on the material and enabling it to move downward smoothly to press the material.

[0048] The elastic ball component 8 includes a housing 82 and a ball holder 83 disposed inside the housing 82. Both the housing 82 and the ball holder 83 are provided with openings, and the openings of the housing 82 and the ball holder 83 are connected by an end cap 84. A number of small balls 85 are provided on the inner wall of the ball holder 83. A buckle groove 86 is provided on the end cap 84. A large ball 81 is provided in the accommodation space 87 formed by enclosing the buckle groove 86 and the number of small balls 85. The inner side surface of the buckle groove 86 is an inclined spherical surface, and the outer spherical surface of the large ball 81 matches the inclined spherical surface, so that the large ball 81 can roll smoothly in the accommodation space 87 formed by enclosing the buckle groove 86 and the number of small balls 85. The up and down movement of the self-moving material balance filtering device 23 is driven by the rolling of the large ball 81.

[0049] A spring 88 is provided in the space formed by the inner wall of the housing 82 and the outer wall of the ball holder 83.

[0050] When the high-oil-content material is being extracted, as the oil is continuously extracted by supercritical carbon dioxide, the organizational structure of the material becomes more and more loose. Its volume expands and its specific gravity decreases, resulting in the phenomenon of free floating of the raw materials, which in turn leads to the formation of a large number of channel flows. As a result, the supercritical carbon dioxide directly flows upward from the channel flow area, while the extraction effect in other raw material areas is greatly reduced.

[0051] To solve the problem of the floating phenomenon of the powdery raw materials during the extraction process, in the present invention, a self-moving material balance filtering device 23 that can move up and down is provided in the extraction basket 13. When the powdery raw materials freely float, the downward movement of the large ball 81 drives the downward movement of the ring mounting seat 1, which in turn drives the filter cloth 3 to move downward to press the material. By blocking the upward movement of the powdery raw materials with the filter cloth 3, the phenomenon of a large number of channel flows generated due to the floating of the materials is effectively inhibited. The flow time of the supercritical carbon dioxide in the extraction basket 13 is extended, the contact time between the supercritical carbon dioxide and the material is increased, the extraction efficiency is greatly improved, the residual oil content is reduced, the extraction time is shortened, and the extraction cost is reduced.

[0052] In the present invention, by providing the filter cloth 3, when the fluid flows from bottom to top, a pressure gradient will be generated to make the filter cloth 3 present an umbrella shape ( Figure 3 The filter cloth 3 marked by the solid line in the figure is the state when the filter cloth 3 droops; the filter cloth 3 marked by the dotted line is the state when the filter cloth 3 floats, that is, the state when the filter cloth 3 presents an umbrella shape), increasing the filtering area of the filter cloth 3, reducing the linear velocity of the fluid, and reducing the risk of blockage of the filter cloth;

[0053] In addition, the powdery raw materials in the extraction kettle are liable to adhere to the grease in the extraction basket 13, resulting in easy blockage of the filter screen or filter plate at the top of the extraction basket 13. After a period of use, the filter screen or filter plate needs to be frequently cleaned to remove dust and grease. By providing the filter cloth 3, the filter cloth 3 is a flexible filter presenting an umbrella shape in the fluid. Its fluttering in the fluid enables self-cleaning of the filter cloth and makes it difficult to be blocked. At the same time, it can effectively prevent the raw material powder from entering the filter screen or filter plate at the top of the basket with the fluid, greatly reducing the risk of blockage of the filter screen or filter plate. Compared with the general hard filtration (tightened sieve meshes, sieve plates, etc.) method, it plays a better anti-blocking effect and a protective role for the filter screen or filter plate at the top of the basket, and can effectively avoid problems such as slow extraction speed and incomplete extraction caused by unsmooth extraction; generally, the fluid in the extraction basket has both longitudinal movement and transverse disturbance. Under the combined action of this fluid movement, the filter cloth in the fluid will be automatically rinsed, making it difficult for the raw material powder to adhere to the filter cloth and cause blockage of the filter cloth, thereby ensuring its permeability.

[0054] Example 3

[0055] A method for using an extraction kettle with a self-moving material balance filtering device includes the following steps:

[0056] 1) Open the basket cover with a filter screen or filter plate at the top of the extraction basket 13, pour the material into the extraction basket 13 from the basket opening, then place the self-moving material balance filtering device 23 above the material, install the basket cover; put the extraction basket 13 into the extraction kettle and cover the kettle cover 9.

[0057] 2) Open the carbon dioxide inlet pipe 27 to enable carbon dioxide to be evenly distributed into the extraction cavity through the circulation pipe 26 and the distribution holes of the distributor to extract the material in the extraction basket 13.

[0058] 3) During the material extraction process, the self-moving material balance filtering device 23 moves up and down in the extraction basket 13 under the rolling of the large ball 81. When the material floats up, the self-moving material balance filtering device 23 moves downward to press the material and block the free floating of the material; during the extraction process, the supercritical carbon dioxide containing grease is output from the carbon dioxide outlet.

[0059] Using the extraction kettle with a self-moving material balance filtering device in Example 2 of this patent and the extraction device in CN201720210470.X to extract high-oil-content tea seeds with an oil content of 50.3% under the same extraction conditions, the results show that:

[0060] The extraction yield of the extraction kettle with a self-moving material balance filtration device in the present invention is 48.54%, the oil recovery rate is 96.5%, the residual oil rate is 1.76%, the extraction time is 2 hours, and the raffinate is off-white, with a loose texture and high oil quality. While for CN201720210470.X, the extraction yield is 46.28%, the oil recovery rate is 92%, the residual oil rate is 4.02%, and the extraction time is 5 hours. It can be seen that the extraction time of the raw materials in the extraction kettle with a self-moving material balance filtration device in this application is greatly shortened, the oil yield and recovery rate are higher, and the residual oil rate is lower.

[0061] For the changes in the above technical features, those skilled in the art can understand and implement them through the written description, so no additional drawings will be provided for illustration.

[0062] The terms "upper", "lower", "left", "right", etc. used to describe the orientation in this article are for the convenience of description based on the orientation shown in the drawings in the accompanying drawings. In the actual device, these orientations may be different due to the placement method of the device.

[0063] The above is only a preferred embodiment of the present invention, and it does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the technical content disclosed above within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An extraction kettle with a self - moving material balance filtering device, comprising a kettle body with an extraction cavity, a kettle cover arranged above the kettle body, and a jacket wrapped around the outer wall of the kettle body. At least one extraction basket is arranged in the extraction cavity, and a basket cover with a filter net or filter plate is arranged at the top of the extraction basket. It is characterized in that: A self - moving material balance filtering device that can move up and down is arranged in the extraction basket. The self - moving material balance filtering device is driven by the rolling of large balls to move up and down in the extraction basket, and is used to prevent the free floating of powdery raw materials during the extraction process. The self - moving material balance filtering device includes a circular ring mounting seat and a pressing ring arranged below the circular ring mounting seat and detachably connected to it. A filtering element is arranged between the circular ring mounting seat and the pressing ring. A plurality of ball mounting seats are evenly arranged along the circumference on the upper surface of the circular ring mounting seat. Elastic ball assemblies are clamped in the ball mounting seats. Large balls are arranged in the elastic ball assemblies. The self - moving material balance filtering device is driven to move up and down by the rolling of the large balls. The filtering element is a filter cloth.

2. The extraction kettle with a self - moving material balance filtering device according to claim 1, It is characterized in that: The elastic ball assembly further includes a housing and a ball support arranged inside the housing. Both the housing and the ball support are provided with openings, and the openings of the housing and the ball support are connected by an end cover. A plurality of small balls are arranged on the inner wall of the ball support. A buckle groove is arranged on the end cover. The large ball is installed in the accommodation space formed by enclosing the buckle groove and the plurality of small balls.

3. The extraction kettle with a self - moving material balance filtering device according to claim 2, It is characterized in that: The inner side surface of the buckle groove is an inclined spherical surface, the outer spherical surface of the large ball matches the inclined spherical surface, and a spring is arranged in the space formed by the inner wall of the housing and the outer wall of the ball support.

4. The extraction kettle with a self - moving material balance filtering device according to claim 1, It is characterized in that: A handle assembly is further arranged on the upper surface of the circular ring mounting seat.

5. The extraction kettle with a self - moving material balance filtering device according to claim 1, It is characterized in that: A locking mechanism, a feed port, a carbon dioxide inlet, a carbon dioxide outlet, and a safety device interface communicating with the extraction cavity are further arranged on the kettle body. The kettle cover and the kettle body are connected by the locking mechanism. A water self - circulation inlet, a water self - circulation outlet, a jacket water inlet, and a jacket water outlet are arranged on the jacket.

6. The extraction kettle with a self - moving material balance filtering device according to claim 5, It is characterized in that: A distributor is connected to the bottom of the kettle body. The distributor includes a distribution head and a connecting member. The distribution head is in the shape of a barrel with one end closed and the other end open, and a plurality of distribution holes are arranged on its side wall. The distribution head is inserted into the kettle body through the carbon dioxide inlet. The connecting member is connected to the distribution head through a flow - through pipeline, and a carbon dioxide inlet pipe, an exhaust pipe, and a sewage discharge pipe communicating with the flow - through pipeline are installed on it. The bottom of the kettle body and the flow - through pipeline are connected by a connecting component.

7. The using method of the extraction kettle with a self - moving material balance filtering device according to claim 6, It is characterized in that: It includes the following steps: 1) Open the basket cover with a filter net or filter plate at the top of the extraction basket, pour the material into the extraction basket from the basket opening, then place the self-moving material balance and filtration device above the material, and install the basket cover; put the extraction basket into the extraction kettle and cover the kettle lid. 2) Open the carbon dioxide inlet pipe, so that carbon dioxide passes through the circulation pipeline and the distribution holes of the distributor in sequence and is evenly distributed into the extraction cavity to extract the material in the extraction basket. 3) During the material extraction process, the self-moving material balance and filtration device moves up and down in the extraction basket under the rolling of the large ball bearings. When the material floats up, the self-moving material balance and filtration device moves down to press the material and prevent the material from floating freely; during the extraction process, the supercritical carbon dioxide containing grease is output from the carbon dioxide outlet.

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