Two-stage centrifugal extraction equipment

Abstract

The invention relates to the technical field of centrifugal extraction, in particular to two-stage centrifugal extraction equipment which comprises a support, a centrifugal kettle is rotatably mounted in the support, a two-stage mass transfer mechanism used for promoting mass transfer of a two-phase medium is arranged in the centrifugal kettle, a kettle cover is fixedly mounted at the top of the centrifugal kettle, and a two-phase collecting channel is formed in the kettle cover. A cover plate is rotationally connected to the top of the kettle cover, a light phase feeding assembly is fixedly connected into the cover plate, a heavy phase feeding assembly is rotationally connected to the bottom of the centrifugal kettle, and a driving assembly for driving the centrifugal kettle to rotate is arranged on the outer side of the bottom of the centrifugal kettle. According to the invention, the light phase and the heavy phase are gathered in the progressive mass transfer assembly, and are scattered and mixed through the progressive mass transfer assembly, so that the mass transfer efficiency of the light phase and the heavy phase which are scattered and fused is improved. The light phase and the heavy phase flow into other progressive mass transfer assemblies from bottom to top, so that the light phase and the heavy phase flow into the progressive mass transfer assemblies have similar impact force, and the two-phase mass transfer efficiency is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of centrifugal extraction, in particular to a two-stage centrifugal extraction device. Background Art

[0002] In the existing centrifugal extraction process, the mixing between the light phase and the heavy phase mainly relies on a relatively extensive stirring action. Specifically, the mass transfer method of the existing centrifugal extraction equipment mainly relies on the rotation of the drum to mix and stir the light phase and the heavy phase injected into the equipment for mass transfer. However, when such centrifugal extraction equipment is performing mixed mass transfer, in order to improve the mass transfer efficiency, it is often necessary to enhance the mixing intensity, which is specifically manifested in increasing the rotation speed of the drum. However, if the rotation speed is too fast, the two-phase liquid will be over-dispersed to form an emulsification phenomenon, resulting in subsequent separation difficulties. For example, some organic phase and aqueous phase systems form a stable emulsion after excessive stirring, which is difficult to achieve stratification through centrifugal force, reducing the processing capacity of the equipment. On the contrary, if the mixing intensity is not enough, the dispersed particles of the two-phase liquid are larger, the contact area is small, the mass transfer effect is poor, and the solute cannot be fully transferred from one phase to another, resulting in low extraction efficiency. Therefore, the prior art urgently needs to design a centrifugal extraction equipment that can fully mix and transfer mass to solve the above problems. Summary of the invention

[0003] The object of the present invention is to provide a two-stage centrifugal extraction device to solve the problems raised in the above background technology.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: A two-stage centrifugal extraction device comprises a bracket, a centrifugal kettle is rotatably mounted in the bracket, a two-stage mass transfer mechanism for promoting mass transfer of two-phase media is arranged in the centrifugal kettle, a kettle cover is fixedly mounted on the top of the centrifugal kettle, a two-phase collection channel for collecting and extracting different media is provided in the kettle cover, a cover plate is rotatably connected to the top of the kettle cover, a light phase feeding assembly is fixedly connected in the cover plate, a heavy phase feeding assembly is rotatably connected to the bottom of the centrifugal kettle, and a driving assembly for driving the centrifugal kettle to rotate is arranged on the outer side of the bottom of the centrifugal kettle.

[0005] A further improvement of the technical solution of the present invention is that the two-stage mass transfer mechanism includes a first mass transfer tube and a second mass transfer tube fixedly installed in the centrifugal kettle, the first mass transfer tube is connected to the interior of the light phase feed assembly, the second mass transfer tube is connected to the interior of the heavy phase feed assembly, the side wall of the first mass transfer tube is equidistantly fixedly connected with a plurality of bifurcated tubes, the side wall of the second mass transfer tube is equidistantly fixedly connected with a plurality of receiving tubes corresponding one to one to the bifurcated tubes, and the receiving tubes and the bifurcated tubes are commonly connected with the same progressive mass transfer assembly.

[0006] A further improvement of the technical solution of the present invention is that the progressive mass transfer component includes a connecting pipe whose two ends are fixedly connected to the bifurcated pipe and the receiving pipe respectively, a valve seat is fixedly installed in the connecting pipe, a ball core is fixedly installed in the valve seat, a plurality of through holes for medium to enter are provided on both sides of the ball core, a cavity for accommodating the medium is provided in the ball core, water outlet pipes are fixedly connected on both sides of the ball core, the water outlet pipes are connected to the inside of the cavity, and the water outlet pipes extend into the centrifuge kettle after passing through the connecting pipe.

[0007] A further improvement of the technical solution of the present invention is that the through holes opened on both sides of the core are symmetrically distributed around the center of the core, and the opening sizes of the through holes are gradually reduced from the outer circumference of the core to the inner core.

[0008] A further improvement of the technical solution of the present invention is that the light phase feed assembly includes a first storage barrel fixedly connected to the cover plate, and the bottom of the first storage barrel is rotatably connected to the bottom of the kettle cover, a first feed port is provided at the top of the first storage barrel, a first discharge port is provided at the bottom of the kettle cover, and the first storage barrel is connected to the interior of the first mass transfer tube through the first discharge port.

[0009] The heavy phase feeding assembly includes a second storage barrel fixedly connected to the bottom of the bracket, and the top of the second storage barrel is rotatably connected to the bottom of the centrifugal kettle, a second feed port is provided at the bottom of the second storage barrel, a second discharge port is provided at the bottom of the centrifugal kettle, and the second storage barrel is connected to the interior of the second mass transfer tube through the second discharge port.

[0010] A further improvement of the technical solution of the present invention lies in that a push plate is slidably installed in the first material storage barrel and the second material storage barrel, a plurality of material transfer holes are opened on the push plate, a cylinder is fixedly installed at the bottom of the first material storage barrel and the bottom of the second material storage barrel, and the output ends of the two cylinders extend into the interior of the first material storage barrel and the second material storage barrel respectively and are fixedly connected to the push plate.

[0011] A further improvement of the technical solution of the present invention is that the two-phase collecting channel consists of a light phase collecting channel and a heavy phase collecting channel, the heavy phase collecting channel is distributed in a ring shape on the outer periphery of the kettle cover, and the light phase collecting channel is distributed in a ring shape on the kettle cover close to the axis of the kettle cover, and a first liquid outlet pipe and a second liquid outlet pipe are fixedly installed on the top of the cover plate, the first liquid outlet pipe is connected to the interior of the light phase collecting channel, and the second liquid outlet pipe is connected to the interior of the heavy phase collecting channel.

[0012] A further improvement of the technical solution of the present invention is that the driving assembly includes a driving motor fixedly mounted on the bottom of the bracket, a driving gear is fixedly mounted on the output end of the driving motor, a receiving gear is fixedly connected to the outer side of the centrifuge kettle, and the driving gear is meshed with the receiving gear, and a dust cover is provided on the outer side cover of the driving gear.

[0013] Compared with the prior art, the present invention has achieved the following technical progress: in the present invention, the light phase and the heavy phase are gathered in the progressive mass transfer component, and the progressive mass transfer component is used to break up and mix the light phase and the heavy phase, so that the mass transfer efficiency of the light phase and the heavy phase after being broken up is improved. The light phase and the heavy phase flow into other progressive mass transfer components from bottom to top, so that the light phase and the heavy phase flowing into the progressive mass transfer component have similar impact force, so that the efficiency of two-phase mass transfer is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a front cross-sectional view of the present invention; Figure 3 It is an enlarged schematic diagram of A in the present invention; Figure 4 It is an enlarged schematic diagram of B in the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure in the centrifugal kettle of the present invention; Figure 6 It is a schematic diagram of the structure of the kettle cover in the present invention.

[0016] In the figure: 1, support; 2, centrifugal kettle; 3, two-stage mass transfer mechanism; 31, first mass transfer pipe; 311, bifurcated pipe; 32, second mass transfer pipe; 321, receiving pipe; 4, kettle cover; 41, light phase collection channel; 42, heavy phase collection channel; 43, first liquid outlet pipe; 44, second liquid outlet pipe; 5, cover plate; 6, light phase feed assembly; 61, first storage barrel; 62, first feed port; 63, first discharge port; 7, Heavy phase feeding assembly; 71, second storage barrel; 72, second feeding port; 73, second discharging port; 8, driving assembly; 81, driving motor; 82, receiving gear; 83, driving gear; 84, dust cover; 9, progressive mass transfer assembly; 91, connecting pipe; 92, valve seat; 93, ball core; 931, through hole; 932, cavity; 94, water outlet pipe; 101, pushing plate; 102, material transfer hole; 103, cylinder. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] The following first describes the concepts involved in the present application in conjunction with the accompanying drawings. It should be noted that the following description of each concept is only to make the content of the present application easier to understand, and does not limit the scope of protection of the present application; at the same time, the embodiments and features in the embodiments of the present application can be combined with each other in the absence of conflict. The present application will be described in detail with reference to the accompanying drawings and in conjunction with the embodiments.

[0019] Example: Figures 1 to 6 As shown, the present invention provides a two-stage centrifugal extraction equipment, including a bracket 1, a centrifugal kettle 2 is rotatably installed in the bracket 1, a two-stage mass transfer mechanism 3 for promoting mass transfer of two-phase medium is provided in the centrifugal kettle 2, a kettle cover 4 is fixedly installed on the top of the centrifugal kettle 2, a two-phase collection channel for collecting and extracting different media is opened in the kettle cover 4, a cover plate 5 is rotatably connected to the top of the kettle cover 4, a light phase feeding assembly 6 is fixedly connected to the cover plate 5, a heavy phase feeding assembly 7 is rotatably connected to the bottom of the centrifugal kettle 2, and a driving assembly 8 for driving the centrifugal kettle 2 to rotate is provided on the outer side of the bottom of the centrifugal kettle 2.

[0020] As a preferred solution provided by an embodiment of a two-stage centrifugal extraction device, the two-stage mass transfer mechanism 3 includes a first mass transfer tube 31 and a second mass transfer tube 32 fixedly installed in the centrifugal kettle 2, the first mass transfer tube 31 is connected to the interior of the light phase feed assembly 6, and the second mass transfer tube 32 is connected to the interior of the heavy phase feed assembly 7, the side wall of the first mass transfer tube 31 is equidistantly fixedly connected with a plurality of branch tubes 311, the side wall of the second mass transfer tube 32 is equidistantly fixedly connected with a plurality of receiving tubes 321 corresponding to the branch tubes 311, and the receiving tubes 321 and the branch tubes 311 are commonly connected with the same progressive mass transfer assembly 9.

[0021] As a further illustration of the embodiments of the present invention, in the existing centrifugal extraction process, the mixing between the light phase and the heavy phase mainly relies on a relatively extensive stirring action. Specifically, the mass transfer method of the existing centrifugal extraction equipment mainly relies on the rotation of the drum to mix and stir the light phase and the heavy phase injected into the equipment for mass transfer. However, when such centrifugal extraction equipment is performing mixed mass transfer, in order to improve the mass transfer efficiency, it is often necessary to increase the mixing intensity, which is specifically manifested in increasing the rotation speed of the drum. However, if the rotation speed is too fast, the two-phase liquid will be over-dispersed to form an emulsification phenomenon, resulting in subsequent separation difficulties. For example, some organic phase and aqueous phase systems form a stable emulsion after excessive stirring, which is difficult to achieve stratification through centrifugal force, reducing the processing capacity of the equipment. On the contrary, if the mixing intensity is not enough, the dispersed particles of the two-phase liquid are large, the contact area is small, the mass transfer effect is poor, the solute cannot be fully transferred from one phase to another, and the extraction efficiency is low.

[0022] In this embodiment, the light phase is injected into the centrifugal kettle 2 from the light phase feed assembly 6 at the top of the centrifugal kettle 2, and the heavy phase is injected into the centrifugal kettle 2 from the heavy phase feed assembly 7 at the bottom of the centrifugal kettle 2 by means of an external pump and pipeline transportation. When the light phase flows from top to bottom along the axial direction of the first mass transfer tube 31, the light phase flows into the progressive mass transfer assembly 9 along the bifurcation tube 311. Similarly, when the heavy phase flows from bottom to top along the axial direction of the second mass transfer tube 32, the heavy phase flows into the progressive mass transfer assembly 9 along the receiving tube 321. In the above manner, the flowing light phase and heavy phase are converged in the progressive mass transfer assembly 9, and then broken up and mixed by the progressive mass transfer assembly 9. This method of merging the light phase and the heavy phase after being broken up increases the contact area between the light phase and the heavy phase, and improves the mass transfer efficiency.

[0023] In addition, in the present embodiment, the injection heights of the light phase and the heavy phase are completely opposite, so that when the light phase and the heavy phase are first injected into the centrifugal kettle 2, they are affected by gravity, so that the light phase and the heavy phase both flow into the progressive mass transfer component 9 at the bottom of the first mass transfer tube 31 and the second mass transfer tube 32, and the influx efficiency of the progressive mass transfer component 9 is much lower than the injection efficiency of the first mass transfer tube 31 and the second mass transfer tube 32. Therefore, the light phase and the heavy phase in the first mass transfer tube 31 and the second mass transfer tube 32 both flow into other progressive mass transfer components 9 from bottom to top along the axial direction of the centrifugal kettle 2, and the light phase and the heavy phase in the progressive mass transfer component 9 at the bottom of the centrifugal kettle 2 have a higher flow rate under the traction of the injection pressure and gravity. The rate of the light phase and the heavy phase at this flow rate in the progressive mass transfer component 9 is improved, so that the efficiency of the two-phase mass transfer is further improved. After the mass transfer is completed, the mixed phase medium flows into the centrifugal kettle 2, and the centrifugal kettle 2 is driven to rotate by the driving component 8. Under the strong centrifugal force generated by the high-speed rotation, the medium begins to be stratified according to the density difference. The heavy phase liquid with a larger density is subjected to a larger centrifugal force and will gradually move toward the outer peripheral wall of the centrifugal kettle 2, while the light phase liquid with a smaller density will move toward the central axis of the centrifugal kettle 2. The separated heavy phase and light phase are collected separately through the two-phase collection channel, and the centrifugal extraction operation can be completed efficiently.

[0024] As a preferred solution provided by an embodiment of a two-stage centrifugal extraction device, the progressive mass transfer component 9 includes a connecting pipe 91 whose two ends are fixedly connected to the bifurcated pipe 311 and the receiving pipe 321 respectively, a valve seat 92 is fixedly installed in the connecting pipe 91, a ball core 93 is fixedly installed in the valve seat 92, a plurality of through holes 931 for medium to enter are provided on both sides of the ball core 93, a cavity 932 for accommodating the medium is provided in the ball core 93, water outlet pipes 94 are fixedly connected on both sides of the ball core 93, the water outlet pipe 94 is connected to the inside of the cavity 932, and the water outlet pipe 94 passes through the connecting pipe 91 and extends into the centrifugal kettle 2.

[0025] As a further explanation of an embodiment of the present invention, in this embodiment, the working principle of the progressive mass transfer component 9 is as follows: the two ends of the connecting tube 91 are respectively connected to the bifurcated tube 311 and the receiving tube 321. When the light phase flows into the connecting tube 91 along the bifurcated tube 311 and the heavy phase flows into the connecting tube 91 along the receiving tube 321, the light phase and the heavy phase respectively flow into the cavity 932 of the ball core 93 along the through holes 931 on the ball core 93. The light phase and the heavy phase broken up by multiple through holes 931 impact each other in the cavity 932. During the impact process, the light phase and the heavy phase accelerate mass transfer, thereby achieving the effect of improving the mass transfer efficiency.

[0026] As a preferred solution provided by an embodiment of a two-stage centrifugal extraction device, the through holes 931 opened on both sides of the ball core 93 are symmetrically distributed around the center of the ball core 93, and the opening size of the through holes 931 is gradually reduced from the outer periphery of the ball core 93 to the inner core direction.

[0027] As a further illustration of an embodiment of the present invention, in this embodiment, when the light phase and the heavy phase flow into the cavity 932 along the through hole 931 respectively, the opening of the through hole 931 is gradually reduced to increase the flow rate of the light phase and the heavy phase, so that the light phase and the heavy phase have a faster rate when flowing into the cavity 932, thereby increasing the mixing rate of the light phase and the heavy phase during mass transfer. In addition, the light phase and the heavy phase flowing in along all the through holes 931 converge at the center point in the cavity 932, so that the light phase and the heavy phase impact each other to offset the impact force, and the contact probability of the light phase and the heavy phase is further improved. After the mass transfer is completed, the mixed phase flows into the centrifugal kettle 2 along the outlet pipe 94, thereby further improving the mass transfer efficiency of the light phase and the heavy phase.

[0028] As a preferred solution provided by an embodiment of a two-stage centrifugal extraction device, the light phase feed assembly 6 includes a first storage barrel 61 fixedly connected to the cover plate 5, and the bottom of the first storage barrel 61 is rotatably connected to the bottom of the kettle cover 4, a first feed port 62 is provided at the top of the first storage barrel 61, a first discharge port 63 is provided at the bottom of the kettle cover 4, and the first storage barrel 61 is connected to the interior of the first mass transfer tube 31 through the first discharge port 63.

[0029] The heavy phase feeding assembly 7 includes a second storage barrel 71 fixedly connected to the bottom of the bracket 1, and the top of the second storage barrel 71 is rotatably connected to the centrifuge kettle 2, a second feed port 72 is provided at the bottom of the second storage barrel 71, a second discharge port 73 is provided at the bottom of the centrifuge kettle 2, and the second storage barrel 71 is connected to the interior of the second mass transfer tube 32 through the second discharge port 73.

[0030] As a preferred solution provided as an embodiment of a two-stage centrifugal extraction device, a push plate 101 is slidably installed in the first storage barrel 61 and the second storage barrel 71, and a plurality of material transfer holes 102 are opened on the push plate 101. Cylinders 103 are fixedly installed on the top of the first storage barrel 61 and the bottom of the second storage barrel 71, and the output ends of the two cylinders 103 extend into the interior of the first storage barrel 61 and the second storage barrel 71 respectively and are fixedly connected to the push plate 101.

[0031] As a further illustration of an embodiment of the present invention, in this embodiment, the light phase and the heavy phase enter the first storage barrel 61 and the second storage barrel 71 respectively, and by externally connecting a pump to the first feed port 62 and the second feed port 72, the light phase flowing into the first storage barrel 61 and the heavy phase flowing into the second storage barrel 71 are both pressurized to flow into the centrifugal kettle 2. During the flow of the light phase and the heavy phase, the cylinder 103 is opened, and the push plate 101 is driven to slide back and forth in the first storage barrel 61 or the second storage barrel 71 along the axial direction of the centrifugal kettle 2, further accelerating the rate at which the light phase or the heavy phase flows into the progressive mass transfer assembly 9. At the same time, a plurality of transfer holes 102 are opened in the circumferential direction of the push plate 101, so that the light phase and the heavy phase flow into the centrifugal kettle 2 along the transfer holes 102.

[0032] As a preferred solution provided by an embodiment of a two-stage centrifugal extraction device, the two-phase collection channel consists of a light phase collection channel 41 and a heavy phase collection channel 42. The heavy phase collection channel 42 is distributed in a ring shape on the outer periphery of the kettle cover 4, and the light phase collection channel 41 is distributed in a ring shape on the kettle cover 4 near the axis of the kettle cover 4. A first liquid outlet pipe 43 and a second liquid outlet pipe 44 are fixedly installed on the top of the cover plate 5. The first liquid outlet pipe 43 is connected to the interior of the light phase collection channel 41, and the second liquid outlet pipe 44 is connected to the interior of the heavy phase collection channel 42.

[0033] As a further illustration of the embodiment of the present invention, in this embodiment, the first liquid outlet pipe 43 and the second liquid outlet pipe 44 are both externally connected to a suction pump. After mixing and mass transfer, the two-phase mixed liquid begins to be stratified according to the density difference under the strong centrifugal force generated by the continuous high-speed rotation of the centrifugal kettle 2. The heavy phase liquid with a larger density will be subjected to a greater centrifugal force and gradually move toward the outer peripheral wall of the centrifugal kettle 2, while the light phase liquid with a smaller density will move closer to the central axis of the centrifugal kettle 2. A negative pressure suction force is applied to the kettle cover 4 by the suction pump, so that the light phase close to the axis of the centrifugal kettle 2 is extracted by the first liquid outlet pipe 43 through the light phase collection channel 41, and the heavy phase close to the outer peripheral wall of the centrifugal kettle 2 is extracted by the second liquid outlet pipe 44 through the heavy phase collection channel 42, thereby realizing the two-phase separation collection process.

[0034] As a preferred solution provided by an embodiment of a two-stage centrifugal extraction device, the driving assembly 8 includes a driving motor 81 fixedly mounted on the bottom of the bracket 1, a driving gear 83 is fixedly mounted on the output end of the driving motor 81, a receiving gear 82 is fixedly connected to the outer side of the centrifugal kettle 2, and the driving gear 83 is meshed with the receiving gear 82, and a dust cover 84 is provided on the outer side cover of the driving gear 83.

[0035] As a further illustration of an embodiment of the present invention, in this embodiment, the driving motor 81 drives the driving gear 83 to rotate. Since the driving gear 83 is meshed with the receiving gear 82, and the receiving gear 82 is fixedly connected to the centrifugal kettle 2, the centrifugal kettle 2 is driven to rotate by the driving motor 81.

[0036] The embodiments and / or implementation methods described above are only used to illustrate the preferred embodiments and / or implementation methods for realizing the technology of the present invention, and are not intended to limit the implementation methods of the technology of the present invention in any form. Any technical personnel in this field may make slight changes or modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present invention, but they should still be regarded as technologies or embodiments that are essentially the same as the present invention.

[0037] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the invention to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A two-stage centrifugal extraction device, comprising a support (1), characterized in that: A centrifugal kettle (2) is rotatably mounted in the support (1), a two-stage mass transfer mechanism (3) for promoting mass transfer of a two-phase medium is provided in the centrifugal kettle (2), a kettle cover (4) is fixedly mounted on the top of the centrifugal kettle (2), a two-phase collection channel for collecting and extracting different media is provided in the kettle cover (4), a cover plate (5) is rotatably connected to the top of the kettle cover (4), a light phase feed assembly (6) is fixedly connected to the cover plate (5), a heavy phase feed assembly (7) is rotatably connected to the bottom of the centrifugal kettle (2), and a driving assembly (8) for driving the centrifugal kettle (2) to rotate is provided on the outer side of the bottom of the centrifugal kettle (2).

2. A two-stage centrifugal extraction device according to claim 1, characterized in that: The two-stage mass transfer mechanism (3) comprises a first mass transfer tube (31) and a second mass transfer tube (32) fixedly installed in the centrifugal kettle (2); the first mass transfer tube (31) is connected to the interior of the light phase feed assembly (6); the second mass transfer tube (32) is connected to the interior of the heavy phase feed assembly (7); a plurality of bifurcated tubes (311) are fixedly connected to the side wall of the first mass transfer tube (31) at equal intervals; a plurality of receiving tubes (321) corresponding to the bifurcated tubes (311) are fixedly connected to the side wall of the second mass transfer tube (32) at equal intervals; the receiving tube (321) and the bifurcated tube (311) are connected together with the same progressive mass transfer assembly (9).

3. A two-stage centrifugal extraction device according to claim 2, characterized in that: The progressive mass transfer component (9) comprises a connecting pipe (91) whose two ends are respectively fixedly connected to the bifurcated pipe (311) and the receiving pipe (321); a valve seat (92) is fixedly installed in the connecting pipe (91); a ball core (93) is fixedly installed in the valve seat (92); a plurality of through holes (931) for medium to enter are provided on both sides of the ball core (93); a cavity (932) for accommodating the medium is provided in the ball core (93); a water outlet pipe (94) is fixedly connected to both sides of the ball core (93); the water outlet pipe (94) is communicated with the inside of the cavity (932); and the water outlet pipe (94) passes through the connecting pipe (91) and then extends into the centrifugal kettle (2).

4. A two-stage centrifugal extraction device according to claim 3, characterized in that: The through holes (931) opened on both sides of the ball core (93) are symmetrically distributed around the center of the ball core (93), and the opening sizes of the through holes (931) are gradually reduced along the outer periphery of the ball core (93) towards the inner core.

5. A two-stage centrifugal extraction device according to claim 2, characterized in that: The light phase feed assembly (6) comprises a first material storage barrel (61) fixedly connected to the cover plate (5), and the bottom of the first material storage barrel (61) is rotatably connected to the bottom of the kettle cover (4), a first material feed port (62) is provided at the top of the first material storage barrel (61), a first material discharge port (63) is provided at the bottom of the kettle cover (4), and the first material storage barrel (61) is connected to the interior of the first mass transfer pipe (31) through the first material discharge port (63); The heavy phase feeding assembly (7) comprises a second material storage barrel (71) fixedly connected to the bottom of the bracket (1), and the top of the second material storage barrel (71) is rotatably connected to the bottom of the centrifugal kettle (2), the bottom of the second material storage barrel (71) is provided with a second material feed port (72), the bottom of the centrifugal kettle (2) is provided with a second material discharge port (73), and the second material storage barrel (71) is connected to the interior of the second mass transfer pipe (32) through the second material discharge port (73).

6. A two-stage centrifugal extraction device according to claim 5, characterized in that: A push plate (101) is slidably mounted inside the first material storage barrel (61) and the second material storage barrel (71), and a plurality of material transfer holes (102) are provided on the push plate (101). A cylinder (103) is fixedly mounted on the top of the first material storage barrel (61) and the bottom of the second material storage barrel (71), and the output ends of the two cylinders (103) extend into the interior of the first material storage barrel (61) and the second material storage barrel (71), respectively, and are fixedly connected to the push plate (101).

7. A two-stage centrifugal extraction device according to claim 1, characterized in that: The two-phase collection channel consists of a light phase collection channel (41) and a heavy phase collection channel (42); the heavy phase collection channel (42) is distributed in an annular shape on the outer periphery of the kettle cover (4); the light phase collection channel (41) is distributed in an annular shape on the kettle cover (4) near the axis of the kettle cover (4); a first liquid outlet pipe (43) and a second liquid outlet pipe (44) are fixedly mounted on the top of the cover plate (5); the first liquid outlet pipe (43) is communicated with the interior of the light phase collection channel (41); and the second liquid outlet pipe (44) is communicated with the interior of the heavy phase collection channel (42).

8. The two-stage centrifugal extraction device according to claim 1, characterized in that: The driving assembly (8) comprises a driving motor (81) fixedly mounted on the bottom of the bracket (1); a driving gear (83) is fixedly mounted on the output end of the driving motor (81); a receiving gear (82) is fixedly connected to the outer side of the centrifugal kettle (2), and the driving gear (83) is meshed with the receiving gear (82); and a dust cover (84) is provided on the outer side of the driving gear (83).

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