float and sink device

Abstract

The application provides a float-and-sink device and relates to the technical field of coal separation.The float-and-sink device comprises a liquid storage mechanism, a separation mechanism and a first conveying mechanism.The liquid storage mechanism comprises a plurality of storage cavities, the storage cavities store separation media, and the density of the separation media stored in each storage cavity is different.The separation mechanism comprises a separation pool, and the first conveying mechanism can convey the separation media between the separation pool and each storage cavity.In use, the prepared separation media is stored in the storage cavities, then the separation media is conveyed into the separation pool by the first conveying mechanism according to the density gradient, and after each float-and-sink test is completed, the first conveying mechanism conveys the separation media in the separation pool back to the storage cavities.Because a plurality of storage cavities are arranged, compared with the prior art, the separation media does not need to be manually prepared each time, meanwhile, automatic multi-density separation can be realized, the test steps are simple, and the workload and production cost are reduced.

Description

Technical Field

[0001] This invention relates to the field of coal floating and sinking technology, and in particular to a floating and sinking device. Background Technology

[0002] The coal float-sink test utilizes Archimedes' principle to separate coals with different relative densities using suspensions of heavy media with varying densities. Through this test, the yield and quality characteristics of different density grades can be determined, revealing the coal's washability. This provides a technical basis for designing coal washing plants, determining sorting methods, process flows, and equipment requirements.

[0003] Test apparatus for buoyancy and sinking tests generally includes a separation tank and a density liquid tank. The density liquid tank is used to prepare the separation medium, which is then used for the buoyancy and sinking test. During the test, the separation medium in the prepared tank is transported to the separation tank, and the coal that sinks into the separation tank is retrieved. However, existing test apparatuses require manual preparation of the separation medium for each test, making multi-density separation impossible. This results in cumbersome test procedures, a large workload, and high production costs. Summary of the Invention

[0004] (I) The problem to be solved by the present invention is that existing coal flotation and sinking devices cannot separate coal into multiple densities, resulting in complicated test procedures, large workload and high production costs.

[0005] (II) Technical Solution

[0006] To address the aforementioned technical problems, one embodiment of the present invention provides a flotation and sinking device, characterized in that it includes: a liquid storage mechanism, a sorting mechanism, and a first conveying mechanism;

[0007] The liquid storage mechanism includes multiple storage cavities, each of which stores a sorting medium, and the density of the sorting medium stored in each storage cavity is different.

[0008] The sorting mechanism includes a sorting pool, and one end of the first conveying mechanism is connected to the sorting pool, and the other end is connected to each of the storage cavities. The first conveying mechanism is capable of conveying sorting media between the sorting pool and each of the storage cavities.

[0009] Furthermore, this also includes racks;

[0010] The frame has a platform, and the liquid storage mechanism and the sorting tank are both disposed on the platform.

[0011] Furthermore, this also includes the feeding mechanism;

[0012] The feeding mechanism includes a conveyor belt connected to the coal preparation plant and a desliming screen located at the end of the conveyor belt, the desliming screen being used to remove mud and scale from the surface of the coal sample.

[0013] The desliming screen has a coal sample outlet, which is connected to the sorting tank.

[0014] Furthermore, it also includes a circulation mechanism;

[0015] The bottom of the sorting tank is provided with a liquid inlet, and one end of the first conveying mechanism is connected to the liquid inlet, and the other end is connected to each of the storage cavities respectively;

[0016] The circulation mechanism includes a conveying component and a liquid outlet located on the sorting tank. One end of the conveying component is connected to the liquid outlet, and the other end is connected to the liquid inlet.

[0017] Furthermore, the bottom of the sorting tank is provided with a funnel-shaped flow channel, one end of which forms the liquid inlet, and the other end is provided with an orifice plate;

[0018] The flow channel sidewall is provided with a high-pressure air outlet, which faces the orifice plate.

[0019] Furthermore,

[0020] It also includes a recycling mechanism and a second conveying mechanism, the recycling mechanism being used to recycle the sorting medium;

[0021] The recycling mechanism includes a recycling bin, which is connected to the sorting pool. The recycling bin is used to recycle the sorting medium in the sorting pool, and the second conveying mechanism can convey the sorting medium in the recycling bin to the storage cavity.

[0022] and / or;

[0023] The recycling mechanism includes a magnetic separator, and the sorting medium is a mixture of magnetite powder, coal slime and water. The magnetic separator is used to recover the magnetite powder in the sorting medium, and the second conveying mechanism can convey the magnetite powder to the storage cavity.

[0024] Furthermore,

[0025] The sorting tank is equipped with a retrieval component, and the side wall of the sorting tank is provided with a discharge port. The retrieval component is used to retrieve the material in the sorting tank to the discharge port.

[0026] The flotation device further includes a desliming screen, which has a material inlet, a material outlet, and a sorting medium outlet. The material inlet is connected to the discharge port, and the sorting medium outlet is connected to the recovery mechanism.

[0027] and / or;

[0028] The recycling mechanism also includes a discharge pipe, one end of which is connected to the sorting pool and the other end of which is connected to the recycling mechanism.

[0029] Furthermore,

[0030] The flotation device also includes a storage tank containing a sorting medium, wherein the density of the sorting medium in the storage tank is higher than the density of the sorting medium in any of the storage cavities.

[0031] The second conveying mechanism includes a first conveying section, a second conveying section, and a power assembly;

[0032] One end of the first conveying section is connected to the recycling mechanism, and the other end is connected to the storage tank. One end of the second conveying section is connected to the storage tank, and the other end is connected to each of the storage cavities. The power assembly enables the sorting medium to flow within the first conveying section and the second conveying section.

[0033] Furthermore, each of the storage cavities is equipped with a densitometer, which is used to monitor the density of the sorting medium within the storage cavity;

[0034] and / or;

[0035] A densitometer is installed in the sorting tank to monitor the density of the sorting medium in the sorting tank.

[0036] Furthermore, the salvage assembly includes a scraper, a transmission assembly, and a drive component;

[0037] The side wall of the sorting tank is provided with a discharge port. The driving component is connected to the scraper through the transmission assembly. The driving component drives the scraper to scrape the material that has sunk into the sorting tank to the discharge port.

[0038] The beneficial effects of this invention are:

[0039] This invention provides a flotation and sinking device, comprising: a liquid storage mechanism, a sorting mechanism, and a first conveying mechanism. The liquid storage mechanism includes multiple storage chambers, each storing a sorting medium with a different density. The sorting mechanism includes a sorting pool. One end of the first conveying mechanism is connected to the sorting pool, and the other end is connected to each of the storage chambers. The first conveying mechanism can transport the sorting medium between the sorting pool and each storage chamber. In use, the prepared sorting medium is stored in the corresponding storage chamber. Then, according to the density gradient, the sorting medium is conveyed to the sorting pool through the first conveying mechanism to conduct a coal flotation and sinking test. After each flotation and sinking test, the first conveying mechanism returns the sorting medium from the sorting pool to the storage chamber. Because multiple storage chambers are provided for storing the sorting medium, compared to existing technologies, there is no need for manual preparation of the sorting medium each time. Simultaneously, multi-density sorting can be achieved, the test steps are simplified, and the workload and production costs are reduced. Attached Figure Description

[0040] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of the floating and sinking device provided in an embodiment of the present invention;

[0042] Figure 2 A process structure diagram of the floating and sinking device provided in an embodiment of the present invention;

[0043] Figure 3 A flowchart of the floating and sinking method provided in an embodiment of the present invention.

[0044] Icons: 11 - Storage chamber; 12 - Density liquid tank;

[0045] 21-Separation tank; 211-Inlet; 212-Outlet; 213-Flow channel; 214-High-pressure air outlet; 215-Horizontal pipe; 22-Scraper; 23-Chain; 24-Driven sprocket;

[0046] 31-Recycling bin; 32-Desliming screen; 33-Storage bin; 34-Magnetic separator;

[0047] 4-Weighing mechanism;

[0048] 51-Conveyor belt; 52-Desliming screen;

[0049] 61-First pipeline; 62-Second pipeline; 63-Third pipeline; 64-Fourth pipeline; 65-First transfer pump; 66-Second transfer pump; 67-Third transfer pump; 68-Fourth transfer pump; 69-Discharge pipeline;

[0050] 7-Rack; 71-Tabletop. Detailed Implementation

[0051] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] It should be noted that in the description of this invention, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0053] It should be noted that in the description of this invention, the terms "connection" and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or a connection through an intermediate medium; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0054] like Figure 1 and Figure 2 As shown, this embodiment of the invention provides a flotation and sinking device for automatically conducting flotation and sinking tests on materials, specifically coal. The flotation and sinking device includes a liquid storage mechanism, a sorting mechanism, and a first conveying mechanism. The liquid storage mechanism includes multiple storage chambers 11, each storing a sorting medium, and the density of the sorting medium stored in each storage chamber 11 is different. The sorting mechanism includes a sorting pool 21. One end of the first conveying mechanism is connected to the sorting pool 21, and the other end is connected to each storage chamber 11. The first conveying mechanism can convey the sorting medium between the sorting pool 21 and each storage chamber 11.

[0055] In this embodiment, during a float-and-sink test, the first conveying mechanism transports the sorting medium from one of the storage chambers 11 to the sorting pool 21 for material sorting. After sorting, the first conveying mechanism then transports the sorting medium from the sorting pool 21 back to the corresponding storage chamber 11. Furthermore, the first conveying mechanism sequentially transports the sorting medium into the sorting pool 21 in descending order of density for sorting.

[0056] The flotation and sinking device provided in this embodiment includes a liquid storage mechanism, a sorting mechanism, and a first conveying mechanism. The liquid storage mechanism stores the sorting medium, which can be a heavy medium suspension, a zinc chloride solution, or other solutions. In this embodiment, the sorting medium is a heavy medium suspension, a mixture of magnetite powder, coal slime, and water. It is non-corrosive, harmless to humans, and ensures the health of operators. The liquid storage mechanism has multiple storage chambers 11, and the density of the sorting medium in each storage chamber 11 is different to meet the requirements for sorting media of different densities during the coal flotation and sinking test.

[0057] In this embodiment, the density of the sorting medium in all storage cavities 11 is set in a gradient, such as 1.8 kg / L, 1.7 kg / L, 1.6 kg / L, 1.5 kg / L and 1.4 kg / L. The first conveying mechanism is used to convey the sorting medium in the storage chamber 11 to the sorting pool 21 in order of decreasing density. For example, the first conveying mechanism first conveys the sorting medium with a density of 1.8 kg / L to the sorting pool 21, and then conveys the coal sample into the sorting pool 21. Coal with a density less than 1.8 kg / L will float on the surface of the sorting medium, while coal with a density greater than 1.8 kg / L will sink to the bottom of the sorting pool 21. Then, the coal sample that has sunk to the bottom of the sorting pool 21 is retrieved by the retrieval component. The first conveying mechanism then conveys the sorting medium with a density of 1.8 kg / L back to the storage chamber 11 for holding the 1.8 kg / L sorting medium. Then, the sorting medium with a density of 1.7 kg / L is input into the sorting pool 21. By continuously repeating the above process, the sorting of all coal samples is completed, and the test is finished.

[0058] By sequentially feeding the sorting media into the sorting pool 21 in order of density gradient from high to low, the accuracy of the test results is ensured, and coal samples with different densities but both higher than the density of the sorting media are prevented from being mixed and retrieved from the sorting pool 21 by the retrieval component.

[0059] In this embodiment, the liquid storage mechanism consists of multiple density liquid tanks 12, each of which has a storage cavity 11. The sorting medium is stored in the density liquid tank 12. To prevent particles in the sorting medium from settling and to ensure the uniformity of the sorting medium, a stirring paddle is installed inside the density liquid tank 12. Driven by a motor, the stirring paddle continuously rotates to stir the sorting medium, making its density uniform. Furthermore, this application can achieve a single processing capacity of 100 kg of coal by adjusting the fit between the volume of the density liquid tank 12 and the size of the sorting pool 21.

[0060] In this embodiment, the density liquid tank 12 is open, the motor is located above the density liquid tank 12, and the motor output extends into the density liquid tank 12 and is connected to the stirring paddle for transmission.

[0061] Optionally, in this embodiment, the liquid storage mechanism can also be a storage tank, which can be divided into multiple storage cavities 11 by setting partitions.

[0062] In this embodiment, the sorting mechanism includes a sorting pool 21. The feeding mechanism sends the coal sample into the sorting pool 21 for a float-sink test. The sorting pool 21 and the storage mechanism are connected through a first conveying mechanism. The first conveying mechanism includes a first pipeline 61 and a first conveying pump 65. One end of the first pipeline 61 is connected to the inlet 211 of the sorting pool 21, and the other end forms multiple branches. Each branch corresponds to a storage chamber 11, and each branch is connected to the corresponding storage chamber 11. A control valve, such as a solenoid valve or a pinch valve, is also provided on the branch to control the opening and closing of the branch. When it is necessary to convey the sorting medium, the corresponding control valve is open, and the sorting medium can flow in the first pipeline 61. During the process of the first conveying mechanism conveying the sorting medium between the sorting pool 21 and the storage cavity 11, the first conveying pump 65 can be a bidirectional pump, that is, the first conveying pump 65 can convey the sorting medium both in the direction from the storage cavity 11 to the sorting pool 21 and in the direction from the sorting pool 21 to the storage cavity 11; or it can be done by setting up two pipelines, one pipeline for conveying the sorting medium in the storage cavity 11 to the sorting pool 21, and the other pipeline for conveying the sorting medium in the sorting pool 21 back to the storage cavity 11.

[0063] Optionally, multiple pipelines can be set up, with each storage chamber 11 connected to the sorting pool 21 via a separate pipeline.

[0064] The floating and sinking device provided in this embodiment, when in use, stores the configured sorting medium in the corresponding storage cavity 11, and then, according to the density gradient, conveys the sorting medium into the sorting pool 21 through the first conveying mechanism to conduct a floating and sinking test on the coal sample to sort the coal sample. After each sorting is completed, the first conveying mechanism conveys the sorting medium in the sorting pool 21 back to the storage cavity 11. Since multiple storage cavities 11 are provided for storing the sorting medium, compared with the prior art, it is not necessary to manually prepare the sorting medium each time, which reduces the human involvement in the floating and sinking test, improves the accuracy of the floating and sinking test results, realizes automated multi-density sorting, simplifies the test steps, and reduces the workload and production cost.

[0065] like Figure 1 As shown, the flotation and sinking device provided in this embodiment also includes a frame 7. The frame 7 has a platform 71, and the liquid storage mechanism and the sorting tank 21 are both disposed on the platform 71.

[0066] In this embodiment, the frame 7 is the support mechanism for the flotation device. The frame 7 has a platform 71, and the liquid storage mechanism and the sorting tank 21 are both set on the platform 71 to facilitate operation by the operator and to facilitate observation of the working status of the liquid storage mechanism and the sorting tank 21.

[0067] Meanwhile, there is also a certain space under the platform 71, where pipes, as well as subsequent structures such as the recycling bin 31 and storage bin 33, can be installed to make the entire floating and sinking device layout compact.

[0068] like Figure 1 and Figure 2 As shown, the flotation device provided in this embodiment also includes a feeding mechanism for conveying coal samples into the sorting tank 21. The feeding mechanism includes a conveyor belt 51 connected to the coal preparation plant, and a desliming screen 52 disposed at the end of the conveyor belt 51. The desliming screen 52 has a coal sample outlet, which is connected to the sorting tank 21.

[0069] In this embodiment, the desliming screen 52 has a coal sample inlet and a coal sample outlet. The starting end of the conveyor belt 51 is directly connected to the coal preparation production line of the coal preparation plant to improve the automation level of the coal preparation plant. In use, coal samples from the coal preparation production line of the coal preparation plant are directly fed onto the conveyor belt 51. The conveyor belt 51 transports the coal samples to the desliming screen 52 located at the end of the conveyor belt 51. The coal sample inlet of the desliming screen 52 is located below the end of the conveyor belt 51, allowing the coal sample from the coal preparation production line of the coal preparation plant to be directly fed into the desliming screen 52 through the inlet. The desliming screen 52 is used to remove mud and scale from the surface of the coal sample. The coal sample outlet of the desliming screen 52 is located directly above the separation tank 21. The separation tank 21 is open, and the coal sample, after being deslimed by the desliming screen 52, is directly fed into the separation tank 21. Optionally, a structure such as a hopper can be provided at the top of the separation tank 21 and connected to the coal sample outlet of the desliming screen 52.

[0070] like Figure 1 and Figure 2 As shown, the flotation device provided in this embodiment also includes a circulation mechanism. The bottom of the sorting tank 21 is provided with a liquid inlet 211. One end of the first conveying mechanism is connected to the liquid inlet 211, and the other end is connected to each of the storage chambers 11. The circulation mechanism includes a conveying component and a liquid outlet 212 disposed on the sorting tank 21. One end of the conveying component is connected to the liquid outlet 212, and the other end is connected to the liquid inlet 211.

[0071] In this embodiment, the liquid inlet 211 is located at the bottom of the sorting tank 21. The sorting medium from the storage chamber 11 enters the sorting tank 21 from the bottom. During the process of transporting the sorting medium, it can generate a certain impact and stirring effect on the sorting medium that has been transported to the sorting tank 21, so as to ensure the uniformity of the sorting medium.

[0072] Meanwhile, during the sorting process, the sorting medium in the sorting tank 21 is circulated through the circulation mechanism, so that the sorting medium in the sorting tank 21 continuously leaves the sorting tank 21 from the liquid outlet 212 and enters the sorting tank 21 from the liquid inlet 211 at the bottom. This can also generate a certain impact and stirring effect on the sorting medium in the sorting tank 21, making the sorting medium in the sorting tank 21 uniform and avoiding the sedimentation of coal slime and magnetite powder.

[0073] By setting up a circulation mechanism, the separation medium in the separation tank 21 can be stirred to a certain extent, ensuring that the separation medium in the separation tank 21 is uniform and the separation results are accurate.

[0074] In use, the sorting medium is first conveyed into the sorting tank 21 through the first conveying mechanism. When the sorting medium fills the sorting tank 21, the first conveying mechanism stops working, and the circulation mechanism starts to circulate the sorting medium in the sorting tank 21. Specifically, the conveying component is started to draw the sorting medium in the sorting tank 21 out through the liquid outlet 212 and then convey it into the sorting tank 21 through the liquid inlet 211 to generate a certain impact and stirring effect on the sorting medium in the sorting tank 21.

[0075] In this embodiment, the bottom of the sorting tank 21 is provided with multiple liquid inlets 211 to improve the stirring effect on the sorting medium in the sorting tank 21. Correspondingly, the first pipeline 61 is also provided with multiple branches corresponding to the liquid inlets 211.

[0076] In this embodiment, a horizontal pipe 215 is provided at the top of the sorting tank 21, and multiple liquid outlets 212 are provided on the horizontal pipe 215. By placing the liquid outlets 212 at the top of the sorting tank 21, local dead zones can be avoided in the sorting tank 21, and the stirring effect is good.

[0077] In this embodiment, the delivery assembly includes a second pipeline 62 and a second delivery pump 66. One end of the second pipeline 62 is connected to the horizontal pipe 215, and the other end is connected to the liquid inlet 211.

[0078] like Figure 1 and Figure 2 As shown, the bottom of the sorting tank 21 is provided with a funnel-shaped flow channel 213, one end of which forms the liquid inlet 211, and the other end is provided with an orifice plate. A high-pressure air outlet 214 is provided on the side wall of the flow channel 213, and the high-pressure air outlet 214 faces the orifice plate.

[0079] In this embodiment, a funnel-shaped flow channel 213 is provided at the bottom of the sorting tank 21. The sorting medium enters the funnel-shaped flow channel 213 through the liquid inlet 211, making the sorting medium enter the sorting tank 21 more evenly and improving the accuracy of the sorting results. An orifice plate is provided in the flow channel 213. On the one hand, the orifice plate is used to prevent coal, gangue, etc. from settling into the liquid inlet 211 and causing blockage. On the other hand, the orifice plate can also play a role in flow distribution, adjusting the distribution of the sorting medium and making the sorting medium enter the sorting tank 21 evenly.

[0080] Meanwhile, a high-pressure air outlet 214 is provided on the inner wall of the flow channel 213. The high-pressure air outlet 214 can blow out high-pressure gas. Specifically, the high-pressure air outlet 214 is connected to a high-pressure gas source. The high-pressure air outlet 214 faces the orifice plate. When the orifice plate is blocked, high-pressure gas is blown out to the orifice plate through the high-pressure air outlet 214 to prevent coal, gangue, etc. from blocking the orifice plate. At the same time, the high-pressure gas blown out through the high-pressure air outlet 214 can also disperse the coal lumps accumulated on the liquid surface of the separation tank 21.

[0081] like Figure 1 and Figure 2 As shown, the floating and sinking device provided in this embodiment also includes a recovery mechanism and a second conveying mechanism. The recovery mechanism is used to recover the sorted medium. The recovery mechanism includes a recovery tank 31, and the third conveying mechanism can convey the sorted medium in the recovery tank 31 to the storage cavity 11.

[0082] and / or;

[0083] The recycling mechanism includes a magnetic separator 34, and the sorting medium is a mixture of magnetite powder, coal slime and water. The magnetic separator 34 is used to recover the magnetite powder in the sorting medium, and the second conveying mechanism can convey the magnetite powder to the storage cavity 11.

[0084] In this embodiment, the recycling mechanism is used to recycle the sorting medium during the buoyancy test. By setting up the recycling mechanism, the amount of sorting medium used can be saved and the production cost can be reduced.

[0085] In this embodiment, one implementation of the recycling mechanism is as follows: the recycling mechanism includes a recycling bin 31, which is used to recycle the sorting medium in the sorting pool 21, specifically, the sorting medium overflowing from the sorting pool 21 and the sorting medium in the sorting pool 21 that has not been promptly removed by the first conveying mechanism. One end of the second conveying mechanism is connected to the recycling bin 31, and the other end is connected to all the storage cavities 11, enabling the recycled sorting medium to be conveyed to the corresponding storage cavity 11, avoiding waste of the sorting medium and reducing production costs.

[0086] One embodiment of the recycling mechanism is as follows: The recycling mechanism includes a magnetic separator 34. In this embodiment, the sorting medium is a heavy medium suspension, and the recycling mechanism is mainly used to recover magnetite powder from the heavy medium suspension (the cost of coal slime in the coal preparation plant is negligible). The magnetite powder recovered by the magnetic separator 34 is transported to the storage chamber 11 by the second conveying mechanism to adjust the density of the sorting medium in the storage chamber 11.

[0087] One embodiment of the recycling mechanism includes a recycling bin 31 and a magnetic separator 34. The functions, effects, and configurations of the recycling bin 31 and the magnetic separator 34 in this embodiment are the same as in the two embodiments described above, and will not be repeated here. A second conveying mechanism simultaneously conveys the sorting medium in the recycling bin 31 and the magnetite powder recovered by the magnetic separator 34.

[0088] like Figure 1 and Figure 2 As shown, a retrieval assembly is provided in the sorting pool 21, and a discharge port is provided on the side wall of the sorting pool 21. The retrieval assembly is used to retrieve the material in the sorting pool 21 to the discharge port.

[0089] The flotation device also includes a desliming screen 32, which has a material inlet, a material outlet, and a sorting medium outlet. The material inlet is connected to the discharge port, and the sorting medium outlet is connected to the recycling mechanism.

[0090] and / or;

[0091] The recycling mechanism also includes a discharge pipe 69, one end of which is connected to the sorting pool 21 and the other end of which is connected to the recycling mechanism.

[0092] In this embodiment, the desizing screen 32 is used to remove the sorting medium adhering to the surface of the coal sample, and the recovery pipeline is used to recover the sorting medium that was not drawn away by the first conveying mechanism (the sorting medium will partially remain on the inner wall of the sorting pool 21). The specific method will be described in detail below.

[0093] In this embodiment, the desliming screen 32 can be provided separately, the recovery pipeline can be provided separately, or both the desliming screen 32 and the recovery pipeline can be provided simultaneously. Preferably, in this embodiment, the flotation device is provided with both the desliming screen 32 and the recovery pipeline.

[0094] In this embodiment, the desliming screen 32 is used to remove the sorting medium adhering to the coal surface. Specifically, as mentioned above, the sorting medium is a mixture of magnetite powder, coal slime, and water. The main adhering substances on the coal surface are magnetite powder and coal slime. The desliming screen 32 is mainly used to remove the magnetite powder and coal slime adhering to the coal surface. The desliming screen 32 is a vibrating desliming screen 32, which includes a screen, a motor, and a spray pipe installed above the screen. In use, the coal scooped up by the scooping component directly enters the screen. The motor drives the screen to vibrate, and the screen, through vibration and in conjunction with the spray pipe spraying clean water onto the screen, washes the surface of the coal, causing the magnetite powder and coal slime adhering to the coal surface to separate from the coal. The magnetite powder and coal slime are discharged from the desliming screen 32 by the sorting medium and enter the recovery mechanism, while the coal leaves the screen through the material outlet and enters the next process.

[0095] like Figure 1 and Figure 2 As shown, a weighing mechanism 4 is also provided at the material outlet, which is used to measure the weight of the material.

[0096] In this embodiment, the coal leaving the screen through the material outlet enters the weighing mechanism 4, which is used to measure the weight of the coal. By measuring the weight of coal samples with different densities, subsequent processes, such as ash content analysis or other tests, are facilitated.

[0097] In this embodiment, the weighing mechanism 4 is a belt weighing machine, the structure, principle and usage of which are well known in the art and will not be described in detail here.

[0098] The flotation and sinking device and the recovery mechanism provided in this embodiment are also used to recover the sorting medium in the sorting pool 21.

[0099] The buoyancy device provided in this embodiment, such as Figure 1 and Figure 2 As shown, the flotation device also includes a discharge pipe 69, one end of which is connected to the sorting pool 21 and the other end is connected to the recycling mechanism.

[0100] During use, after the float-sink test is completed, the first conveying mechanism will transport the sorting medium in the sorting pool 21 back to the corresponding storage chamber 11. Some sorting medium or some sorting medium containing impurities will remain in the sorting pool 21. By setting up the discharge pipeline 69, the remaining sorting medium in the sorting pool 21 can be recycled to the recycling mechanism, which can avoid the waste of sorting medium and reduce production costs.

[0101] In this embodiment, preferably, the discharge pipe 69 is connected to the inlet 211. Since the inlet 211 is located at the bottom of the sorting tank 21, the sorting medium in the sorting tank 21 can enter the recycling mechanism through the discharge pipe 69 under the action of gravity. At the same time, since the outlet 212 is also provided with a perforated plate, it can play a certain screening role for the sorting medium.

[0102] In this embodiment, the first conveying mechanism includes a four-way connector with a first interface, a second interface, a third interface, and a fourth interface. The fourth interface is connected to the inlet 211 via a pipeline, the first interface is connected to the first pipeline 61, the second interface is connected to the second pipeline 62, and the third interface is connected to the outlet pipeline 69. Control valves for controlling the on / off state are also provided at the first, second, and third interfaces. These control valves can be solenoid valves or pinch valves, etc. When the sorting medium is conveyed between the sorting tank 21 and the storage chamber 11 via the first pipeline 61, the control valves at the second and third interfaces are disconnected, while the control valve at the first interface remains open. When the sorting medium is circulated within the sorting tank 21 via the second pipeline 62, the control valves at the first and third interfaces are disconnected, while the control valve at the second interface remains open. When the sorting medium is discharged from the sorting tank 21 via the outlet pipeline 69, the control valves at the first and second interfaces are disconnected, while the control valve at the third interface remains open.

[0103] In this embodiment, the sorting medium outlet of the desliming screen 32 is connected to the recycling mechanism. This can be either the sorting medium outlet of the desliming screen 32 is connected to the recycling bin 31, or the sorting medium outlet of the desliming screen 32 is connected to the magnetic separator 34, or two branches can be provided at the sorting medium outlet of the desliming screen 32, which are respectively connected to the recycling bin 31 and the magnetic separator 34.

[0104] Similarly, the recycling pipeline is connected to the recycling mechanism. This can be either the recycling pipeline connected to the recycling bin 31, or the recycling pipeline connected to the magnetic separator 34, or the recycling pipeline can be provided with two branches, which are connected to the recycling bin 31 and the magnetic separator 34 respectively.

[0105] In this embodiment, optionally, the sorting medium outlet and the recovery pipeline of the desizing screen 32 are both connected to the recovery tank 31, and the sorting medium discharged from the sorting medium outlet and the sorting medium collected by the recovery pipeline are both transported into the recovery tank 31.

[0106] As mentioned above, the preferred embodiment of this invention includes a recycling mechanism comprising a recycling bin 31 and a magnetic separator 34. Furthermore, the recycling bin 31 is also connected to the magnetic separator 34.

[0107] Specifically, the magnetic separator 34 has a feed inlet and a magnetic material outlet, and the recycling bin 31 is connected to the feed inlet.

[0108] In this embodiment, because the material recovered in the recovery tank 31 is affected by the desliming screen 32 (where water washing desliming occurs), the density of the sorting medium will be lower than that of the sorting medium in the storage chamber 11. Therefore, the sorting medium in the recovery tank 31 cannot be directly transported to the storage chamber 11. Hence, the recovery tank 31 is connected to the feed port of the magnetic separator 34, and the sorting medium recovered in the recovery tank 31 is transported to the magnetic separator 34. The magnetic separator 34 recovers the magnetite powder in the sorting medium (heavy medium suspension), thereby reducing the operating cost of the flotation device.

[0109] The buoyancy device provided in the embodiments of the present invention, such as Figure 1 and Figure 2 As shown, the flotation device further includes a storage tank 33, which stores a sorting medium, and the density of the sorting medium in the storage tank 33 is higher than the density of the sorting medium in any of the storage cavities 11. The second conveying mechanism includes a first conveying section, a second conveying section, and a power component; one end of the first conveying section is connected to the recovery mechanism, and the other end is connected to the storage tank 33; one end of the second conveying section is connected to the storage tank 33, and the other end is connected to each of the storage cavities 11; the power component enables the sorting medium to flow within the first conveying section and the second conveying section.

[0110] In this embodiment, the storage tank 33 is used to store high-density sorting media to adjust the density of the sorting media in the storage cavity 11. For example, when the density of the sorting media in a certain storage cavity 11 is lower than a preset value, the second conveying section cooperates with the conveying assembly to input high-density sorting media into the storage cavity 11 to increase the density of the sorting media in the storage cavity 11. Correspondingly, when the density of the sorting media in a certain storage cavity 11 is higher than the preset value, the density of the sorting media can be reduced by injecting water into the storage cavity 11.

[0111] In this embodiment, the density of the sorting medium recovered by the recycling mechanism may be high or low, and may be different from the density of the sorting medium in the storage tank 33. Therefore, the sorting medium recovered by the recycling mechanism is transported to the storage tank 33 and transported to the storage cavity 11 together with the sorting medium in the storage tank 33.

[0112] In this embodiment, the recycling bin 31 can be connected to the storage bin 33, the magnetic material outlet of the magnetic separator 34 can be connected to the storage bin 33, or both the recycling bin 31 and the magnetic material outlet of the magnetic separator 34 can be connected to the storage bin 33.

[0113] In this embodiment, as mentioned above, the recycling mechanism preferably includes both a recycling bin 31 and a magnetic separator 34. Therefore, in this embodiment, the magnetic material outlets of both the recycling bin 31 and the magnetic separator 34 are connected to the storage bin 33.

[0114] In this embodiment, the magnetite powder adhering to the coal surface is washed by the spray pipe and mixed with water before entering the recovery bin 31. The density of the sorting medium in the recovery bin 31 is necessarily lower than that in the storage chamber 11, so it cannot be directly input into the storage chamber 11. On the other hand, the density of the sorting medium in the storage bin 33 is higher than that in any of the storage chambers 11, and it is also necessarily higher than that in the recovery bin 31. By setting up the storage bin 33, the sorting medium in the recovery bin 31 can be input into the storage bin 33, which enables the sorting medium in the recovery bin 31 to be reused and reduces production costs.

[0115] Similarly, the magnetite powder recovered by the magnetic separator 34 is transported to the storage tank 33, which can further increase the density of the separation medium in the storage tank 33.

[0116] Furthermore, preferably, since the recycling bin 31 is also connected to the feed inlet of the magnetic separator 34, that is, the recycling bin 31 is connected to the storage bin 33 through the magnetic separator 34, that is, the recycling bin 31, the magnetic separator 34 and the storage bin 33 are arranged in sequence.

[0117] In this embodiment, this arrangement can also avoid the problem of the density of the sorting medium in the storage bucket 33 decreasing due to the sorting medium in the recycling bucket 31.

[0118] When in use, the proportion of each component in the sorting medium can be adjusted by adding water and coal slime to the storage tank 33.

[0119] In this embodiment, the first conveying section includes a third pipeline 63, the second conveying section includes a fourth pipeline 64, and the power assembly includes a third conveying pump 67 and a fourth conveying pump 68. One end of the third pipeline 63 is connected to the recycling bin 31, and the other end is connected to the inlet of the magnetic separator 34. The magnetic material outlet of the magnetic separator 34 is connected to the storage bin 33. The third conveying pump 67 is installed on the third pipeline 63 and can make the sorting medium flow from the recycling bin 31 to the magnetic separator 34. One end of the fourth pipeline 64 is connected to the storage bin 33, and the other end forms multiple branches corresponding to the storage chamber 11. The branches are connected to the corresponding storage chamber 11, and a control valve, such as a solenoid valve, is installed on the branch to control the opening and closing of the branch. The fourth conveying pump 68 can make the sorting medium flow from the storage bin 33 to the storage chamber 11 and, in conjunction with the solenoid valve, deliver it to the corresponding storage chamber 11.

[0120] In this embodiment, the working process of the recovery mechanism is as follows: After a certain density of sorting medium is drawn away by the first conveying mechanism, the sorting medium remaining in the sorting pool 21 flows to the recovery tank 31 through the recovery pipeline. At the same time, the coal retrieved by the retrieval component enters the desizing screen 32 through the discharge port. The desizing screen 32 removes the sorting medium adhering to the coal surface, and the separated sorting medium is also transported to the recovery tank 31. Under the action of the third pipeline 63 and the third conveying pump 67, the sorting medium in the recovery tank 31 is transported to the magnetic separator 34 through the inlet. The magnetic separator 34 separates the magnetite powder in the sorting medium. The magnetite powder is discharged to the storage tank 33 through the magnetic material outlet, and then transported to the storage chamber 11 that needs to be adjusted by the fourth pipeline 64 and the fourth conveying pump 68.

[0121] Optionally, the second conveying section can also consist of multiple pipelines, with each storage chamber 11 connected to the storage tank 33 via a separate pipeline.

[0122] Optionally, the recycling bin 31 can be directly connected to all storage chambers 11. When the density of the sorting medium in a certain storage chamber 11 is higher than a preset value, the low-density sorting medium in the recycling bin 31 can be input into the storage chamber 11 by the third delivery pump 67.

[0123] like Figure 1 and Figure 2 As shown, each of the storage cavities 11 is equipped with a densitometer, which is used to monitor the density of the sorting medium in the storage cavity 11; and / or, the sorting pool 21 is equipped with a densitometer, which is used to monitor the density of the sorting medium in the sorting pool 21.

[0124] In this embodiment, a densitometer is used to monitor the density of the sorting medium to determine whether the density of the sorting medium in the storage cavity 11 is within a preset value, so as to facilitate timely adjustment and ensure the accuracy of sorting.

[0125] When a densitometer is installed in storage chamber 11, if the densitometer in a certain storage chamber 11 detects that the density of the sorting medium is lower than a preset value, the fourth delivery pump 68 is started. The corresponding control valve controls the corresponding branch passage, and the fourth delivery pump 68 inputs high-density sorting medium into it through the fourth pipeline 64 to increase the density of the sorting medium in that storage chamber 11. If the densitometer in a certain storage chamber 11 detects that the density of the sorting medium is higher than a preset value, water can be injected into that storage chamber 11 to reduce the density of the sorting medium in that storage chamber 11.

[0126] When the densitometer is installed in the sorting tank 21, it monitors the density of the sorting medium in the sorting tank 21. When the density of the sorting medium in the sorting tank 21 is lower or higher than the preset density value, timely intervention is required to avoid affecting the sorting results.

[0127] Optionally, a densitometer can be installed in the storage cavity 11, in the sorting pool 21, or simultaneously in both the storage cavity 11 and the sorting pool 21. In this embodiment, densitometers are installed simultaneously in both the sorting pool 21 and the storage cavity 11 to improve accuracy.

[0128] Optionally, in this embodiment, the floating and sinking device includes a control system, a density meter, and an electrical connection with the fourth delivery pump 68. The density of the sorting medium in the storage cavity 11 monitored by the density meter is fed back to the control system, and the control system controls the fourth delivery pump 68 and the corresponding solenoid valve to work together.

[0129] like Figure 1 and Figure 2 As shown, the retrieval assembly includes a scraper 22, a transmission assembly, and a drive component. The side wall of the sorting tank 21 is provided with a discharge port. The drive component is connected to the scraper 22 via the transmission assembly, and the drive component drives the scraper 22 to scrape the material to the discharge port.

[0130] In this embodiment, the retrieval assembly includes a scraper 22, which scrapes the coal that has sunk to the bottom of the sorting tank 21 to the discharge port. The retrieval assembly includes a drive component and a transmission component. The drive component is connected to the tube sheet through the transmission component and is able to drive the scraper 22 to move within the sorting tank 21.

[0131] When in use, after the sorting is completed, the drive unit is started, and the scraper 22 located at the bottom of the sorting tank 21 is moved through the transmission component. The scraper 22 moves along the bottom wall of the sorting tank 21 and then moves upward along the side wall of the sorting tank 21. The material moves to the discharge port under the action of the scraper 22.

[0132] In this embodiment, one sidewall of the sorting tank 21 is inclined to facilitate scraping of material by the scraper 22. Furthermore, to prevent material leakage, the width of the scraper 22 must be equal to the width of the sorting tank 21. The inclined sidewall of the sorting tank 21 means that the cross-section of the sorting tank 21 perpendicular to the scraper 22 is trapezoidal, and the discharge port is formed at the end of the inclined sidewall. In use, the scraper 22 moves along the bottom wall and the inclined sidewall of the sorting tank 21, scraping the material within the sorting tank 21 to the discharge port.

[0133] In this embodiment, the desliming screen 32 is disposed at the discharge port to catch the material falling from the discharge port.

[0134] like Figure 1 and Figure 2 As shown, the transmission assembly includes a drive sprocket, a driven sprocket 24, and a chain 23. Multiple scrapers 22 are spaced apart on the chain 23. The driven sprocket 24 is disposed on the bottom wall of the sorting tank 21, and the drive sprocket is disposed at the discharge port. The chain 23 meshes with the drive sprocket and the driven sprocket 24, and is disposed in close contact with the inner wall of the sorting tank 21. The driving component is connected to the drive sprocket and drives the drive sprocket to rotate.

[0135] In this embodiment, multiple scrapers 22 are provided to prevent material leakage at the bottom of the sorting tank 21. One end of the scraper 22 is fixedly connected to the chain 23, and the other end is always in contact with the inner wall of the sorting tank 21 during the scraping process. That is, when the scraper 22 is at the bottom wall of the sorting tank 21, the end of the scraper 22 away from the chain 23 is in contact with the bottom wall of the sorting tank 21, and when the scraper 22 is at the side wall of the sorting tank 21, the end of the scraper 22 away from the chain 23 is in contact with the side wall of the sorting tank 21.

[0136] Optionally, in this embodiment, the transmission component can also be a transmission belt, which can also achieve the purpose of driving the scraper 22 to move in this embodiment.

[0137] In this embodiment, the driven sprocket 24 is located on the bottom wall of the sorting tank 21 and away from the inclined side wall, so that the scraper 22 can more comprehensively cover the sorting tank 21. The chain 23 extends along the inner wall of the sorting tank 21, that is, one end of the chain 23 is parallel to the bottom wall of the sorting tank 21 and the other end is inclined to the inclined side wall. This can be achieved by setting a sprocket inside the sorting tank 21 to support the chain 23.

[0138] The flotation and sedimentation device provided in this embodiment of the invention takes a heavy medium suspension as the separation medium. When in use, firstly, the prepared heavy medium suspensions of different densities (a mixture of magnetite powder, coal slime and water) are respectively loaded into the corresponding density liquid tanks 12. At the same time, the stirring paddle in the density liquid tank 12 rotates to prevent the magnetite powder and coal slime from settling. Taking a system comprising three density tanks 12 with separation media densities of 1.8 kg / L, 1.6 kg / L, and 1.4 kg / L as an example, firstly, the solenoid valve of the density tank 12 containing the heavy medium suspension with a density of 1.8 kg / L is opened. The first delivery pump 65 injects the separation medium with a density of 1.8 kg / L into the separation tank 21 through the first pipeline 61. At the same time, the conveyor belt 51 is turned on, and the coal sample from the coal preparation plant is fed into the separation tank 21 after the mud has been removed by the desliming screen 52. Afterward, the first delivery pump 65 stops working, and the second delivery pump 66 starts, drawing the heavy medium suspension in the separation tank 21 out through the outlet 212 on the horizontal pipe 215 and then transporting it back to the separation tank 21 through the inlet 211, so that the heavy medium suspension in the separation tank 21 circulates, avoiding the sedimentation of magnetite powder and coal slime, ensuring the uniformity of the heavy medium suspension, and avoiding affecting the separation results. Coal with a density higher than 1.8 kg / L begins to sink to the bottom of the sorting tank 21. The drive unit operates, driving the drive sprocket to rotate. The chain 23 drives the scraper 22 to scrape the coal sample from the bottom of the sorting tank 21 to the desliming screen 32. The desliming screen 32 operates, separating the coal sample from coal slime and magnetite powder. The coal slime and magnetite powder enter the recovery tank 31. When all coal with a density higher than 1.8 kg / L has sunk to the bottom of the sorting tank 21, the drive unit and the second conveying pump 66 both stop operating. The first conveying pump 65 operates, transporting the sorting medium in the sorting tank 21 back to the density liquid tank 12. At the same time, preparations are made to switch to a sorting medium with a density of 1.6 kg / L. The sorting medium with a density of 1.6 kg / L is injected into the sorting tank 21. The above process is repeated until all coal samples with densities greater than 1.6 kg / L, greater than 1.4 kg / L, and less than 1.4 kg / L are sorted. The heavy medium suspension that enters the recycling bin 31 is then pumped into the magnetic separator 34 by the third transfer pump 67. The magnetic separator 34 recovers the magnetite powder. However, the coal slime in the coal preparation plant is huge, so the coal slime is discharged and no longer recycled.

[0139] Another embodiment of the present invention also provides a floating and sinking method for use with the floating and sinking device described in any of the above embodiments, such as... Figure 3 As shown, the buoyancy method includes the following steps:

[0140] S1. The sorting medium in one of the storage chambers 11 is transported to the sorting pool 21 by the first conveying mechanism;

[0141] S2. The material to be sorted is conveyed into the sorting tank 21 through the feeding mechanism;

[0142] S3. Materials with a density lower than that of the sorting medium sink, and the retrieval component retrieves the sinking materials from the sorting pool 21;

[0143] S4. The sorting medium in the sorting pool 21 is transported back to the corresponding storage cavity 11 by the first conveying mechanism;

[0144] S5. Repeat steps S1, S3 and S4 until all materials to be sorted are sorted; wherein, the first conveying mechanism conveys the sorting medium into the sorting pool 21 in descending order of density;

[0145] Steps S1-S5 also include the following steps:

[0146] The density of the sorting medium in each storage cavity 11 is monitored by a densitometer. When the density of the sorting medium in the storage cavity 11 is lower than the preset value, the sorting medium in the storage tank 33 is transported to the corresponding storage cavity 11 through the second conveying section and the power assembly. When the density of the sorting medium in the storage cavity 11 is higher than the preset value, water is added to the corresponding storage cavity 11.

[0147] According to the floating and settling method provided in the embodiment of the present invention, firstly, the sorting medium with the highest density is transported to the sorting pool 21 through the first conveying mechanism. Then, the material to be sorted is transported to the sorting pool 21. The material with a density higher than that of the sorting medium settles, while the material with a density lower than that of the sorting medium floats on the surface of the sorting medium. After a period of time, the sinking material is retrieved by the retrieval component, that is, the material with a density greater than that of the sorting medium is sorted out. After retrieval, the sorting medium in the sorting pool 21 is transported back to the corresponding storage chamber 11 through the first conveying mechanism. Then, the sorting medium is continued to be transported into the sorting pool 21 according to the density gradient through the first conveying mechanism until the material to be sorted is sorted according to density, and the test ends.

[0148] Meanwhile, during the buoyancy test, the density of the sorting medium in the storage cavity 11 and / or sorting pool 21 is monitored by a densitometer to avoid the density of the sorting medium affecting the results of the buoyancy test.

[0149] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A buoyancy device, characterized in that, include: Liquid storage mechanism, sorting mechanism, first conveying mechanism, circulation mechanism, and retrieval assembly; The liquid storage mechanism includes multiple storage cavities (11), each of which stores a sorting medium, and the density of the sorting medium stored in each of the storage cavities (11) is different. The sorting mechanism includes a sorting pool (21), the bottom of which is provided with a funnel-shaped flow channel (213). One end of the flow channel (213) is formed with a liquid inlet (211), and the other end is provided with an orifice plate. One end of the first conveying mechanism is connected to the liquid inlet (211), and the other end is connected to each of the storage cavities (11). The first conveying mechanism can convey the sorting medium between the sorting pool (21) and each of the storage cavities (11). A high-pressure air outlet (214) is provided on the side wall of the flow channel (213), and the high-pressure air outlet (214) faces the orifice plate. The circulation mechanism includes a conveying component and an outlet (212) provided on the sorting tank (21). One end of the conveying component is connected to the outlet (212), and the other end is connected to the inlet (211). The retrieval assembly is located inside the sorting pool (21), and the side wall of the sorting pool (21) is provided with a discharge port. The retrieval assembly is used to retrieve the material from the sorting pool (21) to the discharge port.

2. The buoyancy device according to claim 1, characterized in that, It also includes the rack (7); The frame (7) has a platform (71), and the liquid storage mechanism and the sorting tank (21) are both disposed on the platform (71).

3. The buoyancy device according to claim 1, characterized in that, It also includes the feeding mechanism; The feeding mechanism includes a conveyor belt (51) connected to the coal preparation plant, and a desliming screen (52) located at the end of the conveyor belt (51), which is used to remove mud and dirt from the surface of the coal sample. The desliming screen (52) has a coal sample outlet, which is connected to the sorting tank (21).

4. The buoyancy device according to any one of claims 1 to 3, characterized in that, It also includes a recycling mechanism and a second conveying mechanism, the recycling mechanism being used to recycle the sorting medium; The recycling mechanism includes a recycling bin (31) which is connected to the sorting pool (21). The recycling bin (31) is used to recycle the sorting medium in the sorting pool (21). The second conveying mechanism can convey the sorting medium in the recycling bin (31) to the storage cavity (11). and / or; The recycling mechanism includes a magnetic separator (34), the sorting medium is a mixture of magnetite powder, coal slime and water, the magnetic separator (34) is used to recycle the magnetite powder in the sorting medium, and the second conveying mechanism can convey the magnetite powder to the storage cavity (11).

5. The buoyancy device according to claim 4, characterized in that, The flotation device also includes a desliming screen (32), which has a material inlet, a material outlet and a sorting medium outlet. The material inlet is connected to the discharge port and the sorting medium outlet is connected to the recycling mechanism. and / or; The recycling mechanism also includes a discharge pipe (69), one end of which is connected to the sorting pool (21) and the other end of which is connected to the recycling mechanism.

6. The buoyancy device according to claim 4, characterized in that, The floating and sinking device also includes a storage tank (33), which stores a sorting medium, and the density of the sorting medium in the storage tank (33) is higher than the density of the sorting medium in any of the storage cavities (11). The second conveying mechanism includes a first conveying section, a second conveying section, and a power assembly; One end of the first conveying section is connected to the recycling mechanism, and the other end is connected to the storage tank (33). One end of the second conveying section is connected to the storage tank (33), and the other end is connected to each of the storage cavities (11). The power assembly enables the sorting medium to flow in the first conveying section and the second conveying section.

7. The buoyancy device according to claim 6, characterized in that, Each of the storage cavities (11) is equipped with a densitometer, which is used to monitor the density of the sorting medium in the storage cavity (11); and / or; A densitometer is installed in the sorting pool (21) to monitor the density of the sorting medium in the sorting pool (21).

8. The buoyancy device according to claim 1, characterized in that, The salvage assembly includes a scraper (22), a transmission assembly, and a drive component; The driving component is connected to the scraper (22) via the transmission assembly. The driving component drives the scraper (22) to scrape the material that has sunk into the sorting tank (21) to the discharge port.

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