Automatic medium adding system for dense medium density separation of coal preparation plant

Abstract

The utility model relates to the field of coal washing, in particular to a coal preparation plant dense medium density separation automatic medium adding system which comprises a medium adding assembly and a controller, the medium adding assembly comprises a dense medium tank, a feeding assembly is arranged at one end of the top of the dense medium tank, a water supplementing assembly is arranged at the other end of the top of the dense medium tank, and a communicating pipe is arranged at the bottom of the dense medium tank. The bottom of the communicating pipe is communicated with a water supply pipe, one end of the water supply pipe is provided with a first electromagnetic valve, the other end of the water supply pipe is provided with a sorting connector, an electromagnetic flow control valve is arranged in the middle of the communicating pipe, a first flow meter is arranged between the first electromagnetic valve and the communicating pipe, and a mixing pipe is arranged between the communicating pipe and the sorting connector. A plurality of mixing pieces are fixedly installed in the mixing pipe, a pressure pump is arranged at the end, facing the communicating pipe, of the mixing pipe, a second flow meter and an on-line densimeter are arranged at the end, facing the sorting connector, of the mixing pipe, and the effects of automatically preparing suspended emulsion with the proper concentration and automatically adding media are achieved.

Description

Technical Field

[0001] This application relates to the field of coal washing, and particularly to a system for automatic addition of heavy medium in heavy medium density separation in a coal preparation plant. Background Art

[0002] Coal washing refers to the process of removing impurities such as rocks, gangue, sulfur and ash from raw coal by physical or chemical methods to improve the quality and combustion efficiency of coal. The washed coal products are usually called clean coal, which has lower ash and sulfur content and is more suitable for power generation, coking and other industrial uses. The main methods of coal washing include gravity coal separation, flotation, magnetic separation and heavy medium coal separation, etc. Heavy medium density separation is an efficient method in coal washing, especially suitable for the separation of medium-sized to fine-sized coal. This method is based on the density difference between coal and impurities to achieve separation. During specific operation, a liquid or suspension (called heavy medium) with a density between coal and impurities is used. A common heavy medium material is magnetite powder suspension.

[0003] The existing sorting equipment used in coal preparation plants needs to use a suspension with a certain density to sort coal, and the configuration of the suspension usually requires manual operation. The consumption of the suspension is large, and manual configuration is time-consuming and laborious, which is not convenient to use. Content of the Utility Model

[0004] This application provides a system for automatic addition of heavy medium in heavy medium density separation in a coal preparation plant to solve the problems raised in the above background art.

[0005] The above technical purpose of this application is achieved through the following technical solutions:

[0006] A system for automatic addition of heavy medium in heavy medium density separation in a coal preparation plant includes a heavy medium addition component and a controller. The heavy medium addition component includes a concentrated medium tank. One end of the top of the concentrated medium tank is provided with a feeding component, and the other end of the top of the concentrated medium tank is provided with a water replenishing component. The bottom of the concentrated medium tank is provided with a connecting pipe, and the bottom of the connecting pipe is connected to a water supply pipe. One end of the water supply pipe is provided with a first electromagnetic valve, and the other end of the water supply pipe is provided with a sorting interface. An electromagnetic flow control valve is arranged in the middle of the connecting pipe. A first flowmeter is arranged between the first electromagnetic valve and the connecting pipe. A mixing pipe is arranged between the connecting pipe and the sorting interface. A number of mixing vanes are fixedly installed inside the mixing pipe. A pressure pump is arranged at one end of the mixing pipe facing the connecting pipe, and a second flowmeter and an on-line density meter are arranged at one end of the mixing pipe facing the sorting interface. The electromagnetic flow control valve, the first flowmeter, the second flowmeter, the on-line density meter and the pressure pump are all electrically connected to the controller.

[0007] By adopting the above solution, a feeding component is provided at one end of the top of the concentrated medium tank, and a water replenishing component is provided at the other end of the top of the concentrated medium tank, which is convenient for the feeding component to quantitatively input heavy medium powder into the concentrated medium tank, and the water replenishing component inputs a sufficient amount of water into the concentrated medium tank, facilitating the preparation of a high-concentration and high-density suspension liquid inside the concentrated medium tank. A connecting pipe is provided at the bottom of the concentrated medium tank, and a water supply pipe is connected to the bottom of the connecting pipe, which is convenient for connecting the concentrated medium tank with the water supply pipe. A first solenoid valve is provided at one end of the water supply pipe, and a sorting interface is provided at the other end of the water supply pipe, which is convenient for connecting the first solenoid valve with the external water source water pipe to provide water source for adding medium to the device. The first solenoid valve controls the opening and closing of the water source, and the sorting interface facilitates connecting the device with the sorting equipment, enabling the prepared suspension liquid with appropriate density to be sorted by the sorting equipment. The electromagnetic flow control valve, the first flowmeter, the second flowmeter, the on-line density meter and the pressure pump are all electrically connected to the controller, which is convenient for the controller to control the device. The first flowmeter measures the water entering the sorting device, the electromagnetic flow control valve controls the high-concentration and high-density suspension liquid prepared to be mixed into the water supply pipe, the pressure pump increases the pressure to make the water and the high-concentration and high-density suspension liquid enter the mixing pipe, and after being uniformly mixed inside the mixing pipe, they enter the sorting equipment through the sorting interface. The second flowmeter and the on-line density meter monitor the flow rate and density of the suspension liquid entering the sorting equipment, facilitating the automatic configuration of the device.

[0008] Further, a mounting plate is fixedly installed in the middle of the top end of the concentrated medium tank, and a rotating shaft is rotatably connected to the bottom of the mounting plate.

[0009] Further, a stirring paddle is fixedly installed in the middle of the bottom end of the rotating shaft, and a scraping blade is fixedly installed at the bottom of the rotating shaft.

[0010] By adopting the above solution, a stirring paddle is fixedly installed in the middle of the bottom end of the rotating shaft, and a scraping blade is fixedly installed at the bottom of the rotating shaft, which is convenient for the rotating shaft to drive the stirring paddle to stir the high-concentration and high-density suspension liquid, and the scraping blade is convenient for scraping off the heavy medium powder adhering to the inner wall of the concentrated medium tank, making the mixing more sufficient and uniform.

[0011] Further, a motor box is fixedly installed on the top of the mounting plate, a stirring motor is fixedly installed inside the motor box, and the stirring motor is electrically connected to the controller.

[0012] By adopting the above solution, a stirring motor is fixedly installed inside the motor box, and the stirring motor is electrically connected to the controller, which is convenient for the controller to control the operation of the stirring motor, and the motor box provides protection for the stirring motor.

[0013] Further, a worm is fixedly installed at the output end of the stirring motor, the worm is meshed with a worm gear, and the worm gear is fixedly connected to the rotating shaft.

[0014] By adopting the above scheme, the worm wheel is fixedly connected to the rotating shaft, which facilitates the operation of the stirring motor to drive the worm to drive the worm wheel to rotate, thereby driving the rotating shaft to rotate.

[0015] Furthermore, the feeding assembly includes a hopper, a feeding pipe is connected to the bottom of the hopper, and the bottom of the feeding pipe is connected to the dense medium tank.

[0016] By adopting the above scheme, since the feeding pipe is connected to the bottom of the hopper and the bottom of the feeding pipe is connected to the dense medium tank, it is convenient to store the heavy medium powder inside the hopper, and the heavy medium powder is put into the dense medium tank from the feeding pipe.

[0017] Furthermore, a feeding motor is provided at one end of the feeding pipe, a spiral blade is rotatably connected inside the feeding pipe, the output end of the feeding motor is fixedly connected to the spiral blade, and the feeding motor is electrically connected to the controller.

[0018] By adopting the above scheme, since the output end of the feeding motor is fixedly connected to the spiral blade and the feeding motor is electrically connected to the controller, it is convenient for the controller to control the operation of the feeding motor, and the feeding motor controls the spiral blade to put a certain amount of heavy medium powder into the dense medium tank to prepare a high-concentration and high-density suspension liquid.

[0019] Furthermore, the water replenishing assembly includes a water replenishing pipe, a second electromagnetic valve and a third flow meter are provided in the middle of the water replenishing pipe, and both the second electromagnetic valve and the third flow meter are electrically connected to the controller.

[0020] By adopting the above scheme, since both the second electromagnetic valve and the third flow meter are electrically connected to the controller, it is convenient for the water replenishing pipe to be connected to an external pipe to provide a water source for the preparation of the suspension liquid in the dense medium tank. The third flow meter measures the water entering the dense medium tank, and the second electromagnetic valve controls the amount of water entering the dense medium tank.

[0021] In summary, the present application has the following technical effects:

[0022] One end of the top of the concentrated medium tank is provided with a feeding assembly, and the other end of the top of the concentrated medium tank is provided with a water replenishing assembly, which is convenient for the feeding assembly to quantitatively input heavy medium powder into the concentrated medium tank, and the water replenishing assembly inputs sufficient water into the concentrated medium tank, facilitating the preparation of a suspension liquid with high concentration and high density inside the concentrated medium tank. A connecting pipe is provided at the bottom of the concentrated medium tank, and a water supply pipe is connected to the bottom of the connecting pipe, which is convenient for connecting the concentrated medium tank with the water supply pipe. One end of the water supply pipe is provided with a first solenoid valve, and the other end of the water supply pipe is provided with a sorting interface, which is convenient for connecting the first solenoid valve with the external water source water pipe to provide water source for adding medium to the device. The first solenoid valve controls the opening and closing of the water source, and the sorting interface facilitates connecting the device with the sorting equipment, enabling the prepared suspension liquid with appropriate density to be sorted by the sorting equipment. The electromagnetic flow control valve, the first flow meter, the second flow meter, the on-line density meter and the pressure pump are all electrically connected to the controller, which is convenient for the controller to control the device. The first flow meter measures the water entering the sorting device. The electromagnetic flow control valve controls the mixing of the prepared suspension liquid with high concentration and high density into the water supply pipe. The pressure pump increases the pressure to make the water and the suspension liquid with high concentration and high density enter the mixing pipe. After being evenly mixed inside the mixing pipe, it enters the sorting equipment through the sorting interface. The second flow meter and the on-line density meter monitor the flow rate and density of the suspension liquid entering the sorting equipment, facilitating the automatic configuration of the device. Description of the Drawings

[0023] Figure 1 is the external structure diagram of the present application;

[0024] Figure 2 is the side view of the present application;

[0025] Figure 3 is the internal structure diagram of the concentrated medium tank of the present application;

[0026] Figure 4 is the sectional view of the mixing pipe of the present application;

[0027] Figure 5 is the system block diagram of the present application.

[0028] In the figure, 101 is the medium adding component; 10101 is the concentrated medium tank; 10102 is the connecting pipe; 10103 is the electromagnetic flow control valve; 10104 is the water supply pipe; 10105 is the first solenoid valve; 10106 is the separation interface; 10107 is the first flowmeter; 10108 is the second flowmeter; 10109 is the on-line density meter; 10110 is the mixing pipe; 10111 is the pressure pump; 10112 is the mounting plate; 10113 is the motor box; 10114 is the rotating shaft; 10115 is the stirring paddle; 10116 is the scraping blade; 10117 is the stirring motor; 10118 is the worm; 10119 is the worm gear; 10120 is the mixing blade; 102 is the feeding component; 10201 is the hopper; 10202 is the feeding pipe; 10203 is the feeding motor; 103 is the water replenishing component; 10301 is the water replenishing pipe; 10302 is the second solenoid valve; 10303 is the third flowmeter; 104 is the controller. Detailed implementation mode

[0029] The following further elaborates on this application with reference to the accompanying drawings. Embodiment

[0030] As shown in the Figure 1 to Figure 5 accompanying drawings:

[0031] The utility model provides a system for automatically adding medium in the heavy medium density separation of a coal preparation plant, which includes a medium adding component 101 and a controller 104. The medium adding component 101 includes a concentrated medium tank 10101. One end of the top of the concentrated medium tank 10101 is provided with a feeding component 102, and the other end of the top of the concentrated medium tank 10101 is provided with a water replenishing component 103. By providing the feeding component 102 at one end of the top of the concentrated medium tank 10101 and the water replenishing component 103 at the other end of the top of the concentrated medium tank 10101, it is convenient for the feeding component 102 to quantitatively input heavy medium powder into the concentrated medium tank 10101, and the water replenishing component 103 to input a sufficient amount of water into the concentrated medium tank 10101, facilitating the preparation of a high-concentration and high-density suspension in the concentrated medium tank 10101. The bottom of the concentrated medium tank 10101 is provided with a connecting pipe 10102, and the bottom of the connecting pipe 10102 is connected to a water supply pipe 10104. By providing the connecting pipe 10102 at the bottom of the concentrated medium tank 10101 and connecting the bottom of the connecting pipe 10102 to the water supply pipe 10104, it is convenient to connect the concentrated medium tank 10101 to the water supply pipe 10104. One end of the water supply pipe 10104 is provided with a first solenoid valve 10105, and the other end of the water supply pipe 10104 is provided with a separation interface 10106. By providing the first solenoid valve 10105 at one end of the water supply pipe 10104 and the separation interface 10106 at the other end of the water supply pipe 10104, it is convenient to connect the first solenoid valve 10105 to the external water source water pipe to provide water source for the device to add medium. The first solenoid valve 10105 controls the opening and closing of the water source, and the separation interface 10106 facilitates connecting the device to the separation equipment, enabling the configured and well-mixed suspension with appropriate density to be separated by the separation equipment. The middle of the connecting pipe 10102 is provided with an electromagnetic flow control valve 10103. A first flowmeter 10107 is provided between the first solenoid valve 10105 and the connecting pipe 10102. A mixing pipe 10110 is provided between the connecting pipe 10102 and the separation interface 10106. A number of mixing vanes 10120 are fixedly installed inside the mixing pipe 10110. One end of the mixing pipe 10110 facing the connecting pipe 10102 is provided with a pressure pump 10111. One end of the mixing pipe 10110 facing the separation interface 10106 is provided with a second flowmeter 10108 and an on-line densitometer 10109. The electromagnetic flow control valve 10103, the first flowmeter 10107, the second flowmeter 10108, the on-line densitometer 10109 and the pressure pump 10111 are all electrically connected to the controller 104. By the electromagnetic flow control valve 10103, the first flowmeter 10107, the second flowmeter 10108, the on-line densitometer 10109 and the pressure pump 10111 all being electrically connected to the controller 104, it is convenient for the controller 104 to control the device. The first flowmeter 10107 measures the water entering the separation device. The electromagnetic flow control valve 10103 controls the mixing of the configured high-concentration and high-density suspension into the water supply pipe 10104. The pressure pump 10111 increases the pressure to make the water and the high-concentration and high-density suspension enter the mixing pipe 10110.After being evenly mixed inside the mixing tube 10110, it enters the sorting device through the sorting interface 10106. The second flowmeter 10108 and the on-line densitometer 10109 monitor the flow rate and density of the suspension entering the sorting device, facilitating the automatic configuration of the device.

[0032] Among them, a mounting plate 10112 is fixedly installed in the middle of the top of the concentrated medium tank 10101, and a rotating shaft 10114 is rotatably connected to the bottom of the mounting plate 10112.

[0033] Among them, a stirring paddle 10115 is fixedly installed in the middle of the bottom end of the rotating shaft 10114, and a scraping blade 10116 is fixedly installed at the bottom of the rotating shaft 10114. By fixedly installing a stirring paddle 10115 in the middle of the bottom end of the rotating shaft 10114 and fixedly installing a scraping blade 10116 at the bottom of the rotating shaft 10114, it is convenient for the rotating shaft 10114 to drive the stirring paddle 10115 to stir the high-concentration and high-density suspension, and the scraping blade 10116 facilitates scraping off the heavy medium powder adhering to the inner wall of the concentrated medium tank 10101, making the mixing more sufficient and uniform.

[0034] Among them, a motor box 10113 is fixedly installed at the top of the mounting plate 10112, a stirring motor 10117 is fixedly installed inside the motor box 10113, and the stirring motor 10117 is electrically connected to the controller 104. By fixedly installing a stirring motor 10117 inside the motor box 10113 and electrically connecting the stirring motor 10117 to the controller 104, it is convenient for the controller 104 to control the operation of the stirring motor 10117, and the motor box 10113 provides protection for the stirring motor 10117.

[0035] Among them, a worm 10118 is fixedly installed at the output end of the stirring motor 10117, the worm 10118 is meshed with a worm gear 10119, and the worm gear 10119 is fixedly connected to the rotating shaft 10114. By fixedly connecting the worm gear 10119 to the rotating shaft 10114, it is convenient for the stirring motor 10117 to drive the worm 10118 to drive the worm gear 10119 to rotate, thereby driving the rotating shaft 10114 to rotate.

[0036] Among them, the feeding assembly 102 includes a hopper 10201, a guide pipe 10202 is connected to the bottom of the hopper 10201, and the bottom of the guide pipe 10202 is connected to the concentrated medium tank 10101. By connecting a guide pipe 10202 to the bottom of the hopper 10201 and connecting the bottom of the guide pipe 10202 to the concentrated medium tank 10101, it is convenient for the hopper 10201 to store the heavy medium powder, and the heavy medium powder is put into the concentrated medium tank 10101 from the guide pipe 10202.

[0037] Among them, a feeding motor 10203 is provided at one end of the material guiding pipe 10202. A spiral blade is rotatably connected inside the material guiding pipe 10202. The output end of the feeding motor 10203 is fixedly connected to the spiral blade. The feeding motor 10203 is electrically connected to the controller 104. By fixedly connecting the output end of the feeding motor 10203 to the spiral blade and electrically connecting the feeding motor 10203 to the controller 104, it is convenient for the controller 104 to control the operation of the feeding motor 10203. The feeding motor 10203 controls the spiral blade to put a certain amount of heavy medium powder into the concentrated medium tank 10101 to prepare a suspension with high concentration and high density.

[0038] Among them, the water replenishing component 103 includes a water replenishing pipe 10301. A second solenoid valve 10302 and a third flowmeter 10303 are provided in the middle of the water replenishing pipe 10301. Both the second solenoid valve 10302 and the third flowmeter 10303 are electrically connected to the controller 104. By electrically connecting both the second solenoid valve 10302 and the third flowmeter 10303 to the controller 104, it is convenient for the water replenishing pipe 10301 to communicate with the external pipeline to provide water source for the preparation of the suspension in the concentrated medium tank 10101. The third flowmeter 10303 measures the water entering the concentrated medium tank 10101, and the second solenoid valve 10302 controls the amount of water entering the concentrated medium tank 10101.

[0039] Specifically, the second solenoid valve 10302 and the third flowmeter 10303 are both electrically connected to the controller 104, facilitating the connection between the makeup water pipe 10301 and the external pipeline to provide a water source for the preparation of the suspension in the dense medium tank 10101. The third flowmeter 10303 measures the water entering the dense medium tank 10101, and the second solenoid valve 10302 controls the amount of water entering the dense medium tank 10101. A feed pipe 10202 is connected to the bottom of the hopper 10201, and the bottom of the feed pipe 10202 is connected to the dense medium tank 10101, facilitating the storage of heavy medium powder in the hopper 10201. The heavy medium powder is fed into the dense medium tank 10101 through the feed pipe 10202. The output end of the feeding motor 10203 is fixedly connected to the spiral blade, and the feeding motor 10203 is electrically connected to the controller 104, facilitating the controller 104 to control the operation of the feeding motor 10203. The feeding motor 10203 controls the spiral blade to feed a quantitative amount of heavy medium powder into the dense medium tank 10101 to prepare a high-concentration and high-density suspension. A stirring motor 10117 is fixedly installed inside the motor box 10113, and the stirring motor 10117 is electrically connected to the controller 104, facilitating the controller 104 to control the operation of the stirring motor 10117. The motor box 10113 provides protection for the stirring motor 10117. The worm gear 10119 is fixedly connected to the rotating shaft 10114, facilitating the stirring motor 10117 to drive the worm gear 10119 to rotate through the worm 10118, thereby driving the rotating shaft 10114 to rotate. A stirring paddle 10115 is fixedly installed in the middle of the bottom end of the rotating shaft 10114, and a scraping blade 10116 is fixedly installed at the bottom of the rotating shaft 10114, facilitating the rotating shaft 10114 to drive the stirring paddle 10115 to stir the high-concentration and high-density suspension. The scraping blade 10116 conveniently scrapes off the heavy medium powder adhering to the inner wall of the dense medium tank 10101, making the mixing more sufficient and uniform. A feeding assembly 102 is provided at one end of the top of the dense medium tank 10101, and a makeup water assembly 103 is provided at the other end of the top of the dense medium tank 10101, facilitating the feeding assembly 102 to quantitatively feed heavy medium powder into the dense medium tank 10101, and the makeup water assembly 103 to feed a sufficient amount of water into the dense medium tank 10101, facilitating the preparation of a high-concentration and high-density suspension inside the dense medium tank 10101. A connecting pipe 10102 is provided at the bottom of the dense medium tank 10101, and the bottom of the connecting pipe 10102 is connected to a water supply pipe 10104, facilitating the connection between the dense medium tank 10101 and the water supply pipe 10104. A first solenoid valve 10105 is provided at one end of the water supply pipe 10104, and a sorting interface 10106 is provided at the other end of the water supply pipe 10104, facilitating the first solenoid valve 10105 to be connected to the external water source pipeline to provide a water source for adding medium to the device. The first solenoid valve 10105 controls the opening and closing of the water source, and the sorting interface 10106 conveniently connects the device to the sorting equipment to sort the prepared and well-mixed suspension with appropriate density through the sorting equipment.The electromagnetic flow control valve 10103, the first flowmeter 10107, the second flowmeter 10108, the on-line densitometer 10109 and the pressure pump 10111 are all electrically connected to the controller 104, which facilitates the controller 104 to control the device. The first flowmeter 10107 measures the water entering the sorting device. The electromagnetic flow control valve 10103 controls the mixing of the prepared high-concentration and high-density suspension into the water supply pipe 10104. The pressure pump 10111 increases the pressure to make the water and the high-concentration and high-density suspension enter the mixing pipe 10110. After being evenly mixed inside the mixing pipe 10110, they enter the sorting device through the sorting interface 10106. The second flowmeter 10108 and the on-line densitometer 10109 monitor the flow rate and density of the suspension entering the sorting device, which facilitates the automatic configuration of the device.

[0040] This specific embodiment is only an interpretation of the present application, and it is not a limitation of the present application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. An automatic medium adding system for heavy medium density separation in a coal preparation plant, characterized in that, It includes a medium-adding component (101) and a controller (104). The medium-adding component (101) includes a concentrated medium tank (10101). One end of the top of the concentrated medium tank (10101) is provided with a feeding component (102), and the other end of the top of the concentrated medium tank (10101) is provided with a water-supplementing component (103). The bottom of the concentrated medium tank (10101) is provided with a connecting pipe (10102). The bottom of the connecting pipe (10102) is connected to a water supply pipe (10104). One end of the water supply pipe (10104) is provided with a first solenoid valve (10105), and the other end of the water supply pipe (10104) is provided with a separation interface (10106). An electromagnetic flow control valve (10103) is provided in the middle of the connecting pipe (10102). A first flowmeter (10107) is provided between the first solenoid valve (10105) and the connecting pipe (10102). A mixing pipe (10110) is provided between the connecting pipe (10102) and the separation interface (10106). A number of mixing vanes (10120) are fixedly installed inside the mixing pipe (10110). One end of the mixing pipe (10110) facing the connecting pipe (10102) is provided with a pressure pump (10111). One end of the mixing pipe (10110) facing the separation interface (10106) is provided with a second flowmeter (10108) and an on-line densitometer (10109). The electromagnetic flow control valve (10103), the first flowmeter (10107), the second flowmeter (10108), the on-line densitometer (10109) and the pressure pump (10111) are all electrically connected to the controller (104).

2. The automatic medium addition system for heavy medium density separation in a coal preparation plant according to claim 1, characterized in that, A mounting plate (10112) is fixedly installed in the middle of the top end of the concentrated medium tank (10101). A rotating shaft (10114) is rotatably connected to the bottom of the mounting plate (10112).

3. The automatic medium adding system for heavy medium density separation in a coal preparation plant according to claim 2, wherein A stirring paddle (10115) is fixedly installed in the middle of the bottom end of the rotating shaft (10114), and a scraping blade (10116) is fixedly installed at the bottom of the rotating shaft (10114).

4. The automatic medium adding system for heavy medium density separation in a coal preparation plant according to claim 3, wherein A motor box (10113) is fixedly installed on the top of the mounting plate (10112). A stirring motor (10117) is fixedly installed inside the motor box (10113). The stirring motor (10117) is electrically connected to the controller (104).

5. The automatic medium adding system for heavy medium density separation in a coal preparation plant according to claim 4, characterized in that A worm (10118) is fixedly installed at the output end of the stirring motor (10117). The worm (10118) is meshed with a worm wheel (10119). The worm wheel (10119) is fixedly connected to the rotating shaft (10114).

6. The automatic medium addition system for heavy medium density separation in a coal preparation plant according to claim 1, characterized in that The feeding component (102) includes a hopper (10201). The bottom of the hopper (10201) is communicated with a guiding pipe (10202). The bottom of the guiding pipe (10202) is communicated with the concentrated medium tank (10101).

7. The automatic medium adding system for heavy medium density separation in a coal preparation plant according to claim 6, characterized in that, One end of the material guiding pipe (10202) is provided with a feeding motor (10203). A spiral blade is rotatably connected inside the material guiding pipe (10202). The output end of the feeding motor (10203) is fixedly connected to the spiral blade. The feeding motor (10203) is electrically connected to the controller (104).

8. The automatic medium addition system for heavy medium density separation in a coal preparation plant according to claim 1, characterized in that, The water replenishing component (103) includes a water replenishing pipe (10301). A second solenoid valve (10302) and a third flowmeter (10303) are provided in the middle of the water replenishing pipe (10301). Both the second solenoid valve (10302) and the third flowmeter (10303) are electrically connected to the controller (104).

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