Automatic heavy liquid preparation system of intelligent floating-sinking separation device for coal dressing

Abstract

The invention relates to the technical field of coal separation equipment, in particular to an automatic heavy liquid preparation system of an intelligent floating and sinking experimental device for coal separation. Comprising a spiral conveyor, a heating stirring barrel, a weight sensor, an electromagnetic flowmeter, an electromagnetic valve, an electromagnetic diaphragm metering pump, a mechanical diaphragm metering pump, a multi-level density heavy liquid barrel, an online differential pressure densimeter and a heavy liquid slow-release device, zinc chloride powder is quantitatively conveyed to the heating and stirring barrel through the spiral conveyor, and automatic preparation of heavy liquid is achieved in cooperation with heating and stirring; a mechanical diaphragm pump and an electromagnetic diaphragm pump are used for cooperatively regulating and controlling the density of heavy liquid, and the density is accurately regulated by combining real-time monitoring of an online differential pressure densimeter; dynamic volume management and cyclic recovery of the heavy liquid are realized through the heavy liquid slow-release barrel and the cyclic combined medium barrel. According to the invention, full automation of heavy liquid preparation is realized, the density control precision is high, the experiment cost is effectively reduced, and the problems of low efficiency and large error of traditional manual operation are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of coal separation equipment, and specifically to an automatic heavy liquid preparation system for an intelligent coal flotation experiment device. Background Art

[0002] The flotation test of coal refers to separating coal samples into different density grades with a series of heavy liquids with different densities to determine the yield of each density grade in the coal sample. The purpose of the flotation experiment is to accurately master the density composition of coal and provide basic data for coal washing.

[0003] At present, the method of coal flotation used in coal preparation plants is as follows: First, place the cylindrical net-bottom bucket with coal samples into a heavy liquid bucket with a larger diameter, gently stir with a wooden stick or slowly move the net-bottom bucket up and down. After it stands still and stratifies, carefully manually use a ladle to scoop up the float in a certain direction until it is completely scooped up. Finally, slowly lift the net-bottom bucket containing the sink, place it obliquely on the edge of the bucket, filter out the heavy liquid, and then put it into the heavy liquid bucket of the next density. Repeat the process in sequence according to the density until all coal samples are completed. Finally, pour the sink into a tray.

[0004] At present, the preparation of heavy liquid in coal preparation plants mostly relies on manual operation, which has problems such as inaccurate density control, low efficiency, and waste of heavy liquid. The existing technology lacks automatic density regulation and recycling functions, resulting in high experimental costs and poor repeatability. Summary of the Invention

[0005] In order to make up for the deficiencies of the existing technology, the present invention proposes an automatic heavy liquid preparation system for an intelligent coal flotation separation device. The present invention realizes fully automatic operation by quantitatively feeding materials through a screw conveyor, dissolving in a heating and stirring tank, coordinately regulating the density by two pumps, and integrating the function of heavy liquid recycling.

[0006] The technical solution adopted by the present invention to solve its technical problems is: An automatic heavy liquid preparation system for an intelligent coal flotation separation device, comprising: An automatic heavy liquid preparation system for an intelligent coal flotation separation device, characterized by comprising: A screw conveyor for quantitatively conveying zinc chloride powder; A heating and stirring tank with a stirring impeller and a heating pipe inside for dissolving zinc chloride powder; A weight sensor installed at the bottom of the heating and stirring tank for monitoring the weight of materials; An electromagnetic flowmeter and an electromagnetic valve for controlling the amount of clear water added; An electromagnetic diaphragm metering pump and a mechanical diaphragm metering pump for finely and coarsely adjusting the density of the heavy liquid respectively; Multiple density heavy liquid buckets a - f, each bucket is equipped with an on-line differential pressure density meter a - f and a slow-release electromagnetic valve a - f; Heavy liquid slow-release barrel and heavy liquid slow-release diaphragm pump are used to adjust the volume of heavy liquid in the density barrel.

[0007] Preferably, an annular heating pipe is provided on the inner wall of the heating and stirring barrel, a stirring rod is installed at the center of the barrel cover, and two discharge ports are provided at the bottom of the heating and stirring barrel and are respectively connected to an electromagnetic diaphragm metering pump and a mechanical diaphragm metering pump.

[0008] Preferably, the bottoms of the density heavy liquid barrels a-f are designed with slopes, the end of the slope faces the sewage outlet, and on-line differential pressure density meters a-f are installed on the barrel walls to monitor the density of the heavy liquid in real time.

[0009] Preferably, water adding solenoid valves a-f and heavy liquid adding solenoid valves a-f are respectively provided at the tops of the density heavy liquid barrels a-f. One end of the water adding solenoid valve a-f communicates with the density heavy liquid barrel a-f, and the other end communicates with the clear water pipeline. One end of the heavy liquid adding solenoid valve a-f communicates with the density heavy liquid barrel a-f, and the other end communicates with the heavy liquid pipeline.

[0010] Preferably, the screw conveyor drives the screw conveyor impeller through a conveying motor to achieve quantitative conveying of zinc chloride powder.

[0011] Preferably, the heavy liquid slow-release barrel is connected to each level of density barrel through slow-release solenoid valves a-f. When the volume of the heavy liquid in the barrel exceeds the set threshold, the heavy liquid slow-release diaphragm pump starts to pump the excess heavy liquid into the slow-release barrel.

[0012] Preferably, the data of the weight sensor and the on-line differential pressure density meters a-f are uploaded to the control system in real time. The control system calculates the volume of the heavy liquid in real time and dynamically adjusts the water addition amount and the feeding amount to ensure density stability.

[0013] The beneficial effects of the present invention are as follows: 1. The present invention transports zinc chloride powder to the heating and stirring barrel through a screw conveyor, combines a stirring impeller and a heating pipe to accelerate dissolution, and combines a weight sensor and an electromagnetic flowmeter to monitor the ratio of materials and water in real time, making the heavy liquid configuration automated and improving the heavy liquid configuration efficiency; 2. The present invention designs on-line differential pressure density meters in multiple density heavy liquid barrels to monitor the density of the heavy liquid in each density barrel. When the deviation is too large, the mechanical diaphragm pump is started for rough adjustment, and when the deviation is small, the electromagnetic diaphragm pump is started for fine adjustment, solving the problem of insufficient adjustment accuracy of the traditional single adjustment and improving the heavy liquid density accuracy of each heavy liquid barrel; 3. The present invention is provided with slow-release solenoid valves in multiple density heavy liquid barrels, and combines a heavy liquid slow-release barrel and a heavy liquid slow-release diaphragm pump to solve the problem of density barrel overflow and ensure the stability of system operation. Description of the Drawings

[0014] The present invention will be further described below in conjunction with the drawings and embodiments.

[0015] Figure 1 Schematic diagram of the overall structure of the intelligent coal dressing gravity separation device of the present invention Figure 1 ; Figure 2 Schematic diagram of the overall structure of the intelligent coal dressing gravity separation device of the present invention Figure 2 ; Figure 3 Schematic diagram of the part of the heavy liquid automatic preparation system of the intelligent coal dressing gravity separation device of the present invention; Figure 4 Top view of the part of the heavy liquid automatic preparation system of the intelligent coal dressing gravity separation device of the present invention Figure 5 Cross-sectional view of the heating and stirring tank of the part of the heavy liquid automatic preparation system of the intelligent coal dressing gravity separation device of the present invention Figure 6 Schematic connection diagram of the heavy liquid slow release tank of the part of the heavy liquid automatic preparation system of the intelligent coal dressing gravity separation device of the present invention In the figure: 101 is a screw conveyor, 10101 is a bottom fixed disk, 10102 is a conveying motor, 10103 is a screw conveying impeller, 102 is a heating and stirring barrel, 10201 is a stirring boy, 10202 is a stirring impeller, 10203 is a flange bracket, 10204 is a heating barrel bracket, 10205 is a heating pipe, 103 is a weight sensor, 104 is a receiving hopper, 105 is an electromagnetic flowmeter, 106 is a solenoid valve, 107 is an electromagnetic diaphragm metering pump, 108 is a mechanical diaphragm metering pump, 109 is a heavy liquid slow-release barrel, 1010 is a heavy liquid slow-release diaphragm pump, 10111 is a density heavy liquid barrel a, 10112 is a density heavy liquid barrel b, 10113 is a density heavy liquid barrel c, 10114 is a density heavy liquid barrel d, 10115 is a density heavy liquid barrel e, 10116 is a density heavy liquid barrel f, 10117 is a fixing bracket for the density heavy liquid barrel, 10121 is an on-line differential pressure density meter a, 10122 is an on-line differential pressure density meter b, 10123 is an on-line differential pressure density meter c, 10124 is an on-line differential pressure density meter d, 10125 is an on-line differential pressure density meter e, 10126 is an on-line differential pressure density meter f, 10131 is a heavy liquid adding solenoid valve a, 10132 is a heavy liquid adding solenoid valve b, 10133 is a heavy liquid adding solenoid valve c, 10134 is a heavy liquid adding solenoid valve d, 10135 is a heavy liquid adding solenoid valve e, 10136 is a heavy liquid adding solenoid valve f, 10141 is a clear water adding solenoid valve a, 10142 is a clear water adding solenoid valve b, 10143 is a clear water adding solenoid valve c, 10144 is a clear water adding solenoid valve d, 10145 is a clear water adding solenoid valve e, 10146 is a clear water adding solenoid valve f, 1016 is a clear water adding electromagnetic flowmeter, 10161 is a clear water adding main valve, 301 is a heavy liquid pipeline, 302 is a clear water pipeline; Specific embodiments

[0016] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0017] As Figures 1 to 6 shown, the present invention includes the following embodiments: Embodiment: An automatic heavy liquid preparation system for a coal preparation intelligent float-sink separation device includes a screw conveyor 101, a heating and stirring tank 102, a weight sensor 103 (configured with 2.0 kg / L), a receiving hopper 104, an electromagnetic flowmeter 105 (configured with 2.0 kg / L), a solenoid valve 106 (configured with 2.0 kg / L), an electromagnetic diaphragm metering pump 107, a mechanical diaphragm metering pump 108, a heavy liquid slow-release tank 109, a heavy liquid slow-release diaphragm pump 1010, a density heavy liquid tank a 10111 (1.3 kg / L), a density heavy liquid tank b 10112 (1.4 kg / L), a density heavy liquid tank c 10113 (1.5 kg / L), a density heavy liquid tank d 10114 (1.6 kg / L), a density heavy liquid tank e 10115 (1.7 kg / L), a density heavy liquid tank f 10116 (1.8 kg / L), a fixing bracket 10117 for the density heavy liquid tanks, an on-line differential pressure densitometer a 10121, an on-line differential pressure densitometer b 10122, an on-line differential pressure densitometer c 10123, an on-line differential pressure densitometer d 10124, an on-line differential pressure densitometer e 10125, an on-line differential pressure densitometer f 10126, a heavy liquid adding solenoid valve a 10131, a heavy liquid adding solenoid valve b 10132, a heavy liquid adding solenoid valve c 10133, a heavy liquid adding solenoid valve d 10134, a heavy liquid adding solenoid valve e 10135, a heavy liquid adding solenoid valve f 10136, a clear water adding solenoid valve a 10141, a clear water adding solenoid valve b 10142, a clear water adding solenoid valve c 10143, a clear water adding solenoid valve d 10144, a clear water adding solenoid valve e 10145, a clear water adding solenoid valve f 10146, a clear water adding electromagnetic flowmeter 1016, and a clear water adding main valve 10161; The screw conveyor 101 is fixed through the bottom fixing discs 10101 of four feet, and the conveying port at its top is connected to the receiving hopper 104. The conveying motor 10102 in its driving part can drive the screw conveying impeller 10103 to convey the zinc chloride material in the screw conveyor 101 to the top of the conveying port, and then the zinc chloride material enters the heating and stirring tank 102 through the receiving hopper 104; As an implementation manner of the present invention, the entire heating and stirring barrel 102 is fixed by the heating barrel bracket 10204. A material receiving funnel 104 is installed above the barrel cover. At the central center of the circular barrel cover, a stirring impeller 10201 fixed by a flange bracket 10203 is also installed. The stirring impeller 10202 connected to the stirring impeller 10201 extends through the inner center of the heating and stirring barrel 102. A ring of heating pipes 10205 is installed on the inner wall of the barrel of the heating and stirring barrel 102. Two discharge ports are opened below the barrel of the heating and stirring barrel. One discharge port is connected to an electromagnetic diaphragm metering pump 107 through a pipeline, and the other discharge port is connected to a mechanical diaphragm metering pump 108 through a pipeline. A weight sensor 103 (equipped with 2.0 kg / L) is installed at the bottom of the heating and stirring barrel. An electromagnetic flowmeter 105 (equipped with 2.0 kg / L) and a solenoid valve 106 (equipped with 2.0 kg / L) connected by a pipeline are installed on the heating barrel bracket 1024 of the heating and stirring barrel.

[0018] The screw conveyor 101 can drive the screw conveyor impeller 10104 through the conveying motor 10102 of the driving part to convey the zinc chloride material in the screw conveyor 101 to the top of the conveying port. Then, the zinc chloride material enters the heating and stirring barrel 102 through the material receiving funnel 104 for feeding. The weight sensor 103 (equipped with 2.0 kg / L) installed at the bottom weighs the zinc chloride entering the barrel; the solenoid valve 106 (equipped with 2.0 kg / L) connected to the pipeline in the barrel adds water, and the electromagnetic flowmeter 105 (equipped with 2.0 kg / L) connected to it measures the volume of the clear water entering the barrel through the pipeline; the weight of the material and the volume of the clear water will be uploaded to the control system in real time. When the feeding amount and the water inlet amount per unit time are certain, the control system will calculate the ratio of water and material according to the density of the prepared heavy liquid, and then control the working time of the screw conveyor 101 and the solenoid valve 106 (equipped with 2.0 kg / L); after the water and material are filled, the stirring impeller 10201 installed in the heating and stirring barrel 102 will drive the stirring impeller 10202 to stir the material under the control of the control system; while stirring, the heating pipes 10205 installed on the inner wall of the barrel will also carry out heating work while the water and material are being stirred. The design of this barrel can automatically realize the quantitative feeding, precise preparation, automatic heating, stirring and dissolution of the heavy medium powder (zinc chloride powder).

[0019] As an implementation manner of the present invention, two discharge ports are opened below the barrel of the heating and stirring barrel 102. One of the discharge ports is connected to an electromagnetic diaphragm metering pump 107 through a pipeline, and the other discharge port is connected to a mechanical diaphragm metering pump 108 through a pipeline; these two pumps will pump the high-density heavy liquid in the heating and stirring barrel 102 from the two discharge ports below the barrel to the heavy liquid density barrels a-f (10111-10116) at all levels; As an implementation manner of the present invention, the density buckets at all levels are fixed in sequence by the fixed bracket 10117 of the density heavy liquid bucket, with the density heavy liquid bucket a 10111 (1.3 kg / L), the density heavy liquid bucket b 10112 (1.4 kg / L), the density heavy liquid bucket c 10113 (1.5 kg / L), the density heavy liquid bucket d 10114 (1.6 kg / L), the density heavy liquid bucket e 10115 (1.7 kg / L), and the density heavy liquid bucket f 10116 (1.8 kg / L); the bucket lids of each density-level heavy liquid tank can be turned over and opened, and four inlet and outlet connection ports are designed above the bucket lids. One is connected to the heavy liquid pipeline 301 of the high-density heavy liquid through a pipeline, one is connected to the clear water pipeline 302 through a pipeline, one is connected to the heavy liquid recovery pipeline through a pipeline, and one is reserved for backup; on one side wall of the lower half of each bucket, a circular through-hole for installing the induction devices of the online differential pressure density meters a-f (10121-10126) is designed in the same way, so that the induction devices can be tangent to the inner wall of the density bucket through this through-hole, which is beneficial to the effective measurement of the online differential pressure density meters a-f (10121-10126). Four symmetric circular blind holes are designed at the four corners of the circular through-hole for the installation of the upper flanges of the online differential pressure density meters a-f (10121-10126); three liquid outlets are also designed on the lower half bucket wall of each bucket. One is the heavy liquid outlet for conveying heavy liquid to the floating and sinking device during floating and sinking separation, one is the heavy liquid sewage discharge port for sewage discharge, and one is the heavy liquid slow-release port connected to the slow-release bucket described above through a pipeline; the bottom inside the bucket is designed in a slope shape, and the bottom of the slope faces the heavy liquid sewage discharge port, which is beneficial to the effective discharge of the coal dirt deposited in the density buckets at all levels from the heavy liquid sewage discharge port.

[0020] With the above technical solution, the present invention adopts a density regulation technology in the preparation stage, that is, online differential pressure density meters a-f (10121-10126) are provided on the density heavy liquid barrels a-f (10111-10116) of each density level to real-time monitor the heavy liquid density of each density level; First, a high-density zinc chloride heavy liquid with a density of 2.0 kg / L is prepared in the heating and stirring barrel 102, and then other low-density zinc chloride heavy liquids with a density of 1.3-1.8 kg / L are prepared by using the prepared high-density zinc chloride heavy liquid. During all these preparation processes, the density is detected in real time by the online differential pressure density meters a-f (10121-10126), and the detection results are uploaded to the control system. After calculation by the control system, feedback is given for feedback adjustment. By designing the online differential pressure density meters a-f (10121-10126) on multiple density heavy liquid barrels a-f (10111-10116), the present invention monitors the heavy liquid density in each density barrel, starts the mechanical diaphragm metering pump 108 for rough adjustment when the deviation is too large, and starts the electromagnetic diaphragm metering pump 107 for fine adjustment when the deviation is small, solving the problem of insufficient adjustment accuracy of the traditional single adjustment and improving the heavy liquid density accuracy of each heavy liquid barrel; The specific working process is as follows: When preparing a heavy liquid of a certain density level (a certain level within 1.3 - 1.8 kg / L), if the density of the heavy liquid is on the high side during the preparation process, the control system will first open the total clear water valve 10161. The clear water electromagnetic flowmeter 1016 will detect the water inflow in real time, and the corresponding clear water solenoid valve a - f (one of 10141 - 10146) at this location will also open. Water will be input into the corresponding density heavy liquid bucket a - f (one of 10111 - 10116) through the clear water pipeline 302 to supplement water to the heavy liquid in the bucket. After reaching the calibration value requirement, the corresponding clear water solenoid valve a - f (one of 10141 - 10146) at this location will be automatically closed; if the density of the heavy liquid is on the low side, the electromagnetic diaphragm metering pump 107 and the mechanical diaphragm metering pump 108 connected to the heating and stirring bucket 102 will be controlled by the control system to open according to the magnitude of the density deviation. If the density deviation is too large, the control system will first start the mechanical diaphragm metering pump 108 for rough adjustment. When the deviation is adjusted to be small, the mechanical diaphragm metering pump 108 will be shut down, and then the electromagnetic diaphragm metering pump 107 will be started for fine adjustment; if the density deviation is not large at the beginning, then the control system will directly only start the electromagnetic diaphragm metering pump 107 for fine adjustment; whether it is rough adjustment or fine adjustment, the control system controls the working time of the pump and the opening and closing of the heavy liquid solenoid valve a - f (one of 10131 - 10136), so that a reasonable and quantitative high - density heavy liquid is transported into the corresponding density heavy liquid bucket a - f (one of 10111 - 10116); after reaching the calibration value requirement, the control system will automatically close each metering pump (107 and 108), each clear water solenoid valve a - f (10141 - 10146) and each heavy liquid solenoid valve a - f (10131 - 10136), thereby controlling the stability of each density level.

[0021] As an embodiment of the present invention, in the case where the density of the heavy liquid is known in real time, the weight sensors under each density barrel will provide real-time information on the weight. With the real-time information on the weight and density, the system can calculate the real-time information on the volume inside the barrel. A threshold value is set for the volume inside the barrel. If it is higher than this threshold value, the heavy liquid will be slowly released to reduce the volume inside the barrel to prevent overflow. The specific process is as follows: When the control system automatically detects that the volume exceeds the set threshold value, the corresponding slow-release solenoid valves a-f (10151-10156) of each heavy liquid density barrel a-f (10111-10116) will be opened correspondingly. At the same time, the heavy liquid slow-release diaphragm pump 1010 will also work to slowly release the excess heavy liquid in the density barrel into the heavy liquid slow-release barrel 109. The present invention solves the problem of density barrel overflow by providing slow-release solenoid valves a-f (10151-10156) in multiple density heavy liquid barrels a-f (10111-10116) and combining the heavy liquid slow-release barrel 109 and the heavy liquid slow-release diaphragm pump 1010, ensuring the stability of the system operation; In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the Figure 1 orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the protection scope of the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0022] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A heavy liquid automatic preparation system for an intelligent floating and sinking separation device for coal preparation, characterized in that: include: A screw conveyor (101) is used for quantitatively conveying zinc chloride powder; A heating stirring barrel (102) having a stirring impeller (10202) and a heating tube (10205) built therein, for dissolving zinc chloride powder; A weight sensor (103) is installed at the bottom of the heating and stirring barrel to monitor the weight of the material; An electromagnetic flow meter (105) and an electromagnetic valve (106) are used to control the amount of clean water added; The electromagnetic diaphragm metering pump (107) and the mechanical diaphragm metering pump (108) are used for fine adjustment and coarse adjustment of the density of the heavy liquid, respectively; Multiple density heavy liquid barrels af (10111-10116), each barrel is equipped with an online differential pressure density meter af (10121-10126) and a slow-release solenoid valve af (10151-10156); The heavy liquid slow-release barrel (109) and the heavy liquid slow-release diaphragm pump (1010) are used to adjust the volume of the heavy liquid in the density barrel.

2. According to claim 1, a heavy liquid automatic preparation system for an intelligent floating and sinking separation device for coal preparation, characterized in that: The inner wall of the heating and stirring barrel (102) is provided with an annular heating pipe (10205), a stirring child (10201) is installed in the center of the barrel cover, and the bottom of the heating and stirring barrel (102) is provided with two discharge ports respectively connected to an electromagnetic diaphragm metering pump (107) and a mechanical diaphragm metering pump (108).

3. According to claim 1, a heavy liquid automatic preparation system for an intelligent floating and sinking separation device for coal preparation, characterized in that: The bottom of the density heavy liquid barrel af (10111-10116) is designed as a slope, and the end of the slope is directly opposite to the sewage outlet. An online differential pressure density meter af (10121-10126) is installed on the barrel wall to monitor the density of the heavy liquid in real time.

4. According to claim 1, a heavy liquid automatic preparation system for an intelligent floating and sinking separation device for coal preparation, characterized in that: A clean water adding solenoid valve af (10141-10146) and a weighting liquid adding solenoid valve af (10131-10136) are respectively provided on the top of the density heavy liquid barrel af (10111-10116); one end of the clean water adding solenoid valve af (10141-10146) is connected to the density heavy liquid barrel af (10111-10116), and the other end is connected to the clean water pipeline (302); one end of the weighting liquid adding solenoid valve af (10131-10136) is connected to the density heavy liquid barrel af (10111-10116), and the other end is connected to the heavy liquid pipeline (301).

5. According to claim 1, a heavy liquid automatic preparation system for an intelligent floating and sinking separation device for coal preparation, characterized in that: The screw conveyor (101) drives the screw conveying impeller (10103) via the conveying motor (10102) to achieve quantitative conveyance of zinc chloride powder.

6. According to claim 1, a heavy liquid automatic preparation system for an intelligent floating and sinking separation device for coal preparation, characterized in that: The heavy liquid slow-release barrel (109) is connected to each level of density barrels via slow-release solenoid valves af (10151-10156). When the volume of heavy liquid in the barrel exceeds a set threshold, the heavy liquid slow-release diaphragm pump (1010) is started to pump excess heavy liquid into the slow-release barrel.

7. According to claim 1, a heavy liquid automatic preparation system for an intelligent floating and sinking separation device for coal preparation, characterized in that: The data of the weight sensor (103) and the online differential pressure density meter af (10121-10126) are uploaded to the control system in real time. The control system calculates the volume of the heavy liquid in real time, dynamically adjusts the amount of water added and the amount of feed added, and ensures density stability.

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