Medium adding system of coal cleaning plant

Abstract

The utility model provides a medium adding system for a coal cleaning plant. The medium adding system comprises a medium barrel, a medium suspension barrel and a blast stirring device. The top of the medium barrel is connected with a first clear water pipeline and a medium powder suction cup, an impurity removing grate is fixedly arranged on the upper portion in the medium barrel, a discharging port of the medium barrel is connected with a concentrated medium inlet of the medium suspension barrel through a concentrated medium conveying pipeline, and a conveying pump is arranged on the concentrated medium conveying pipeline. The blast stirring device comprises a blast blower and a blast pipeline, the blast blower is arranged on the blast pipeline, one end of the blast pipeline is communicated with the atmosphere or the inert gas header pipe, and the other end of the blast pipeline penetrates through the bottom of the medium barrel and extends into the medium barrel. According to the coal washing and selecting device, efficient adding of medium powder in the coal washing and selecting process is achieved, and the coal washing and selecting efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of coal preparation production, and in particular to a medium adding system for a coal washing plant. Background Art

[0002] Coal is the main energy source in my country, but after coal is mined, it is inevitably mixed with a large amount of gangue. This part of gangue has high lime content, high sulfur content and low calorific value, which has a great adverse effect on the clean use of coal, so it is necessary to wash the coal. At present, the most widely used washing method is heavy medium coal separation, that is, using magnetite powder, water and coal slime to configure a mixed suspension of a certain density. After the material enters the suspension, the low-density material floats up and the high-density material sinks to achieve the separation of coal and gangue. The coal slime in the suspension is finally used as a product, the water is used for internal circulation, and the magnetite powder is mainly recovered by a magnetic separator for reuse.

[0003] At present, the core link of the medium addition system commonly used in coal washing plants is to directly add the medium powder into the medium suspension cylinder. However, there are many technical difficulties in this process. First, the fluid dynamics characteristics in the medium suspension cylinder are extremely complex, the liquid flow state is chaotic, and the flow velocity, flow direction and turbulence intensity all have significant spatial and temporal changes. This makes it difficult for the newly added medium powder to be quickly dispersed and evenly mixed in the medium water. Secondly, due to the lack of effective promotion means in the mixing process, the contact area between the medium powder and the medium water is limited, and the mixing efficiency is low.

[0004] In addition, in the existing medium adding system, the medium is directly added to the medium suspension barrel, and the impurities in the medium will enter the suspension barrel. These impurities will not only affect the purity and stability of the suspension, but also have an adverse effect on the normal operation of the suspension system. When the impurities enter the pump body, they will block the flow channel of the pump body, affecting the feeding efficiency and the pressure output of the pump. In the long run, it will cause the pump body to wear more, shorten its service life, and increase maintenance costs.

[0005] Therefore, in actual applications, the medium powder often enters the coal preparation system without being fully mixed, resulting in poor sorting effect and unstable product quality. At the same time, due to the presence of debris, the risk of pump blockage increases, which not only reduces production efficiency but also increases maintenance costs. Utility Model Content

[0006] The present application provides a coal washing plant medium addition system to solve the above-mentioned problems mentioned in the background technology.

[0007] The present application provides a medium adding system for a coal washing plant, comprising: a medium barrel, a medium suspension barrel and an air blowing stirring device.

[0008] The top of the medium barrel is connected to a first clean water pipeline and a medium powder suction cup, the upper part of the medium barrel is fixedly provided with a debris removal grate, the discharge port of the medium barrel is connected to the concentrated medium inlet of the medium suspension barrel through a concentrated medium delivery pipeline, and a delivery pump is provided on the concentrated medium delivery pipeline.

[0009] The blast stirring device comprises a blower and a blast pipeline. The blower is arranged on the blast pipeline. One end of the blast pipeline is connected to the atmosphere or to the inert gas main pipe. The other end of the blast pipeline passes through the bottom of the medium barrel and extends into the medium barrel.

[0010] Optionally, a first clean water valve is provided on the first clean water pipeline, and a liquid level sensor is provided on the medium barrel.

[0011] Optionally, a density sensor is provided in the medium suspension barrel, and the medium suspension barrel is also connected to a second clean water pipeline, and a second clean water valve is provided on the second clean water pipeline.

[0012] Optionally, the air blast stirring device also includes: a motor, a first bevel gear, a second bevel gear, a hollow rotating shaft, a plurality of stirring shafts and an air jet cone.

[0013] The motor is arranged at the bottom of the medium barrel, the first bevel gear is fixedly connected to the output shaft of the motor, the second bevel gear is fixedly sleeved on the outside of the hollow shaft, the first bevel gear and the second bevel gear are vertically meshed and connected, one end of the hollow shaft is rotatably connected to the blast pipeline, the other end of the hollow shaft vertically extends into the interior of the medium barrel, the outside of the hollow shaft is connected to multiple stirring shafts, the end of the stirring shaft away from the hollow shaft is connected to the jet cone tube, and the jet cone tube is provided with multiple jet holes.

[0014] Optionally, a plurality of air hole covers are hingedly connected to the air hole.

[0015] Optionally, the plurality of air jet holes are in a frustum shape, and the end with a smaller diameter faces the outside of the air jet cone.

[0016] Optionally, a plurality of jet cones are arranged at equal distances on the stirring shaft along the length direction.

[0017] Optionally, a vibrator is provided at the bottom of the debris removing grate, and a protective cover is provided at the periphery of the vibrator.

[0018] Optionally, the medium adding system is further provided with a controller, which is respectively connected to the medium powder suction cup, the delivery pump, the blower, the first clean water valve, the liquid level sensor, the density sensor, the second clean water valve, the motor and the vibrator.

[0019] The medium adding system for coal washing plant provided in the present application realizes the efficient addition of medium powder in the coal washing process, and has the following beneficial effects compared with the prior art:

[0020] (1) A medium barrel is set inside the medium reservoir, and medium powder and clean water are mixed in the medium barrel to obtain concentrated medium, and then the concentrated medium is transported to the medium suspension barrel for coal washing. Its beneficial effect is that during the coal washing process, concentrated medium can be continuously obtained in the medium barrel and transported to the medium suspension barrel for washing, which not only can achieve continuous coal washing, but also can make the medium powder evenly dispersed during washing, improve the medium utilization rate, and thus improve the efficiency of coal washing. At the same time, the medium barrel is set inside the medium reservoir to facilitate the use of medium powder. By setting a de-impurity grate at the upper part of the medium barrel, large particles of impurities, fibers, etc. in the medium powder and clean water can be screened out, significantly reducing the risk of particulate impurities entering the medium barrel and the medium suspension barrel, and ensuring the purity and stability of the suspension. At the same time, the risk of wear of the delivery pump is avoided, and the blockage of the pump body is avoided, which is not only conducive to the long-term stable operation of the medium addition system, but also improves production efficiency. By setting up an air blast stirring device, the medium powder and clean water can be mixed quickly and evenly, which significantly improves the coal sorting effect of the medium.

[0021] (2) A motor, a first bevel gear, a second bevel gear, a hollow rotating shaft, a plurality of stirring shafts and an air jet cone are further provided in the air blast stirring device. The motor drives the first bevel gear to rotate, the first bevel gear drives the second bevel gear meshing therewith to rotate, the rotation of the second bevel gear drives the rotation of the hollow rotating shaft, and the hollow rotating shaft drives the plurality of stirring shafts to rotate. At the same time, the blower provides power, and the gas is transported into the hollow rotating shaft through the air blast pipeline, and then transported into the interior of the plurality of stirring shafts, and finally ejected from the plurality of air jet holes of the air jet cone. In this way, the stirring shaft ejects gas in the process of rotating with the hollow rotating shaft, and the gas has a certain power when ejecting. The force of the airflow on the material and the mechanical stirring action of the stirring shaft work together to stir the material in the medium barrel, further improve the dispersion uniformity of the medium powder, and thus obtain a concentrated medium with uniform dispersion of the medium powder. In this way, the contact efficiency between the medium powder and the coal is improved, the washing effect of the coal is improved, and a coal product with stable quality is obtained.

[0022] (3) By controlling each device through the controller, the automation level of the medium adding system of the present application is improved, the input of human labor is reduced, and the stability and reliability of the system are ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 A schematic diagram of the structure of a coal washing plant medium addition system provided in one embodiment of the present application;

[0025] Figure 2 A schematic diagram of the structure of an air blast stirring device provided in one embodiment of the present application;

[0026] Figure 3 A schematic diagram of the structure of an air blast stirring device provided in another embodiment of the present application;

[0027] Figure 4 A connection diagram of a controller provided in one embodiment of the present application;

[0028] Description of reference numerals:

[0029] 1: medium barrel, 2: medium suspension barrel, 5: controller, 110: first clean water pipeline, 111: first clean water valve, 120: medium powder suction cup, 130: impurity removal grate, 131: vibrator, 132: protective cover, 140: concentrated medium delivery pipeline, 141: delivery pump, 150: liquid level sensor, 210: density sensor, 220: second clean water pipeline, 221: second clean water valve, 310: blower, 320: blast pipeline, 410: motor, 420: first bevel gear, 430: second bevel gear, 440: hollow shaft, 450: stirring shaft, 460: jet cone, 461: jet hole. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.

[0031] like Figure 1 As shown, the present application provides a medium adding system for a coal washing plant, comprising: a medium barrel 1, a medium suspension barrel 2 and an air blowing stirring device.

[0032] The top of the medium barrel 1 is connected to a first clean water pipeline 110 and a medium powder suction cup 120, and a de-impurity grate 130 is fixedly arranged on the upper part of the medium barrel 1. The discharge port of the medium barrel 1 and the concentrated medium inlet of the medium suspension barrel 2 are connected through a concentrated medium delivery pipeline 140, and a delivery pump 141 is arranged on the concentrated medium delivery pipeline 140.

[0033] The blast stirring device includes a blower 310 and a blast pipeline 320 . The blower 310 is arranged on the blast pipeline 320 . One end of the blast pipeline 320 is connected to the atmosphere or to the inert gas main pipe. The other end of the blast pipeline 320 passes through the bottom of the medium barrel 1 and extends into the medium barrel 1 .

[0034] Specifically, the first clean water pipeline 110 is used to add clean water to the medium barrel 1, the medium powder suction cup 120 is used to suck the medium powder and then put it into the medium barrel 1, and the medium barrel 1 is used to provide space to mix the clean water from the first clean water pipeline 110 and the medium powder from the medium powder suction cup 120 to obtain a concentrated medium. The medium barrel 1 is located inside the medium reservoir to facilitate the use of the medium powder. The concentrated medium in the medium barrel 1 is delivered to the medium suspension barrel 2 by power provided by the delivery pump 141. The medium suspension barrel 2 is used to receive the concentrated medium from the medium barrel 1 and provide space to mix with the coal to wash the coal. The air blast stirring device is used to blow gas into the medium barrel 1 to stir the clean water and medium powder in the medium barrel 1 to obtain a concentrated medium. The setting of the air blast stirring device is conducive to the uniform dispersion of the medium powder in the concentrated medium. When used for coal washing, it is conducive to improving the washing effect, and then it is conducive to obtaining a coal product with stable quality.

[0035] A de-impurity grate 130 is fixedly arranged at the upper part of the medium barrel 1. The de-impurity grate 130 can screen out large particles of impurities, suspended matter, microorganisms, fibers and other impurities in the medium powder and clean water, significantly reducing the risk of particle impurities entering the medium barrel 1 and the medium suspension barrel 2, and ensuring the purity and stability of the suspension. At the same time, the screening of impurities avoids the risk of impurities in the concentrated medium causing the conveying pump 141 to wear during the conveying process due to impurities, and avoids the blockage of the pump body, which is not only conducive to the long-term stable operation of the medium addition system, but also improves production efficiency.

[0036] The blast stirring device includes a blower 310 and a blast pipeline 320. The blower 310 is used to provide power to transport gas to the medium barrel 1 through the blast pipeline 320. The medium powder and clean water form a strong convection cycle in the medium barrel 1 to achieve rapid and uniform mixing. The blast stirring device overcomes the problem of uneven mixing in the traditional medium adding method and significantly improves the coal sorting effect of the medium.

[0037] In the traditional medium adding system, only the medium suspension barrel 2 is set to wash the coal, while in the present application, the medium barrel 1 is set inside the medium reservoir, and the medium powder and clean water are mixed in the medium barrel 1 to obtain concentrated medium, and then the concentrated medium is transported to the medium suspension barrel 2 for washing the coal. The beneficial effect of such arrangement of the present application is that the medium barrel 1 is used for mixing to obtain concentrated medium, and the medium suspension barrel 2 is used for washing, and a concentrated medium with uniform mixing and uniform dispersion of medium powder is obtained in the medium barrel 1. During the washing process of the coal, the concentrated medium can be continuously obtained in the medium barrel 1 and transported to the medium suspension barrel 2, which can not only realize the continuous washing of the coal, but also make the medium powder evenly dispersed during washing, thereby improving the medium utilization rate and thus improving the efficiency of coal washing.

[0038] Among them, the aperture and material of the debris removal grate are determined according to the actual working conditions, and this application will not elaborate on this.

[0039] Furthermore, an air blowing stirring device is also provided at the bottom of the medium suspension barrel 2, which is used to regularly stir the material in the medium suspension barrel 2 when the medium suspension barrel 2 stops washing, so as to prevent the precipitation of medium powder in the material.

[0040] The present application realizes the efficient addition of medium powder in the process of coal washing through the above scheme. By setting a medium barrel inside the medium reservoir, mixing the medium powder and clean water in the medium barrel, a concentrated medium is obtained, and then the concentrated medium is transported to the medium suspension barrel for coal washing. Its beneficial effect is that in the process of coal washing, the concentrated medium can be continuously obtained in the medium barrel and transported to the medium suspension barrel for washing, which can not only realize the continuous washing of coal, but also make the medium powder evenly dispersed during washing, improve the medium utilization rate, and thus improve the efficiency of coal washing. At the same time, the medium barrel is set inside the medium reservoir to facilitate the use of the medium powder. By setting a de-impurity grate on the upper part of the medium barrel, large particles of impurities, fibers, etc. in the medium powder and clean water can be screened out, significantly reducing the risk of particulate impurities entering the medium barrel and the medium suspension barrel, and ensuring the purity and stability of the suspension. At the same time, the risk of wear of the delivery pump is avoided, and the blockage of the pump body is avoided, which is not only conducive to the long-term stable operation of the medium addition system, but also improves production efficiency. By setting up an air blast stirring device, the medium powder and clean water can be mixed quickly and evenly, which significantly improves the coal sorting effect of the medium.

[0041] like Figure 1 As shown, optionally, a first clean water valve 111 is provided on the first clean water pipeline 110 , and a liquid level sensor 150 is provided on the medium barrel 1 .

[0042] Specifically, the first clean water pipeline 110 is used to add clean water to the medium barrel 1, and the addition and closing of clean water are controlled by opening and closing the first clean water valve 111. The liquid level sensor 150 is used to detect the liquid level in the medium barrel 1 in real time. When it is necessary to mix clean water and medium powder in the medium barrel 1, the amount of concentrated medium required can be calculated by the amount of coal to be washed, and then the amount of clean water and the amount of medium powder required can be calculated. Clean water is added to the medium barrel 1 by opening the first clean water valve 111. According to the required amount of clean water, there is a specific liquid level value in the medium barrel 1. When the liquid level reaches the preset liquid level value during the clean water addition process, the first clean water valve 111 is closed. At the same time, according to the calculated amount of medium powder, the same mass of medium powder is sucked by the medium powder suction cup 120 and put into the medium barrel 1 to complete the addition of clean water and medium powder.

[0043] like Figure 1 As shown, optionally, a density sensor 210 is disposed in the medium suspension liquid barrel 2 , and the medium suspension liquid barrel 2 is further connected to a second clean water pipeline 220 , and a second clean water valve 221 is disposed on the second clean water pipeline 220 .

[0044] Specifically, during the coal washing process, the material in the medium suspension barrel 2 needs to maintain a suitable density. The density sensor 210 is used to detect the density of the material in the medium suspension barrel 2 in real time. The second clean water pipeline 220 is used to add clean water to the medium suspension barrel 2 to keep the medium suspension barrel 2 within a suitable density range. If the density in the medium suspension barrel 2 is greater than the preset density, the second clean water valve 221 is opened to add water to the medium suspension barrel 2 to reduce the density in the medium suspension barrel 2. If the density in the medium suspension barrel 2 is less than the preset density, the delivery pump 141 is opened to add concentrated medium to the medium suspension barrel 2 until the density in the medium suspension barrel 2 is within the preset range. In this way, the density in the medium suspension barrel 2 can be grasped and controlled in a timely manner, thereby improving the efficiency of coal washing.

[0045] like Figure 2 As shown, optionally, the air blast stirring device also includes: a motor 410 , a first bevel gear 420 , a second bevel gear 430 , a hollow rotating shaft 440 , a plurality of stirring shafts 450 and an air jet cone 460 .

[0046] The motor 410 is arranged at the bottom of the medium barrel 1, the first bevel gear 420 is fixedly connected to the output shaft of the motor 410, the second bevel gear 430 is fixedly sleeved on the outside of the hollow shaft 440, the first bevel gear 420 and the second bevel gear 430 are vertically meshed and connected, one end of the hollow shaft 440 is rotatably connected to the blast pipeline 320, and the other end of the hollow shaft 440 vertically extends into the interior of the medium barrel 1, and the outside of the hollow shaft 440 is connected to a plurality of stirring shafts 450, and the end of the stirring shaft 450 away from the hollow shaft 440 is connected to the jet cone 460, and the jet cone 460 is provided with a plurality of jet holes 461.

[0047] Specifically, the motor 410 is used to provide power to drive the first bevel gear 420 to rotate, the first bevel gear 420 drives the second bevel gear 430 meshing therewith to rotate, and the rotation of the second bevel gear 430 drives the rotation of the hollow shaft 440. At the same time, the hollow shaft 440 drives the multiple stirring shafts 450 to rotate. The jet cone 460 is arranged at the end of the stirring shaft 450 away from the hollow shaft 440, and the hollow shaft 440 is rotatably connected with the blast line 320. The gas enters the hollow shaft 440 from the blast line 320, and then is transmitted to the multiple stirring shafts 450 through the hollow shaft 440, and finally is ejected from the multiple jet holes 461 of the jet cone 460. The gas has a certain power when ejected, so that the material in the medium barrel 1 can be stirred by the action of the airflow to achieve uniform mixing of clean water and medium powder. While the gas is ejected, the hollow rotating shaft 440 and the plurality of stirring shafts 450 rotate, further improving the uniformity of the dispersion of the medium powder, thereby obtaining a concentrated medium in which the medium powder is uniformly dispersed. When the concentrated medium is then transported to the medium suspension tank 2 for coal washing, the contact efficiency between the medium powder and the coal is improved, the coal washing effect is improved, and a coal product with stable quality is obtained.

[0048] Optionally, a plurality of air hole covers are hingedly connected to the air hole 461 .

[0049] Specifically, the pore cover is in a closed state when the blower 310 is stopped, so that the material in the medium barrel 1 can be prevented from entering the hollow shaft 440 through the multiple jet holes 461, thereby maintaining the unobstructed hollow shaft 440, which is conducive to the smooth passage of gas during the stirring process and improves the mixing efficiency of the medium powder and clean water. During the operation of the blast stirring device, gas is introduced into the hollow shaft 440 through the blower 310, and finally ejected through the multiple jet holes 461 to achieve stirring of the concentrated medium. When the gas is ejected from the multiple jet holes 461, the pore cover is opened to ensure the smooth output of the gas.

[0050] Optionally, the plurality of air injection holes 461 are in a frustum shape, and the end with a smaller diameter faces the outside of the air injection cone 460 .

[0051] Specifically, the multiple jet holes 461 are truncated cones with gradually decreasing diameters from the inside to the outside. This arrangement increases the pressure of the gas flow due to the decrease in the cross section through which the gas flows when the gas is ejected from the multiple jet holes 461, thereby helping to strengthen the stirring of the concentrated medium by the gas flow and facilitating the washing of the coal. At the same time, the diameter of the end of the jet hole 461 in contact with the outside is smaller than the inner diameter, which reduces the possibility of external materials entering the hollow shaft 440 through the jet hole 461, so that the inside of the hollow shaft 440 remains clean.

[0052] like Figure 3 As shown, optionally, a plurality of jet cones 460 are arranged at equal distances on the stirring shaft 450 along the length direction.

[0053] Specifically, the provision of multiple jet cones 460 can increase the amount of gas entering the medium barrel 1, increase the stirring effect of the gas on the material in the medium barrel 1, and further accelerate the dispersion of the medium powder, which helps to improve the efficiency of coal washing.

[0054] like Figure 3 As shown, optionally, a vibrator 131 is provided at the bottom of the debris removing grate 130 , and a protective cover 132 is provided on the periphery of the vibrator 131 .

[0055] Specifically, the vibrator 131 is used to vibrate the impurity removal grate 130 , and during the process of adding the medium powder, the impurity removal by the impurity removal grate 130 is accelerated by the vibration, thereby improving production efficiency. The protective cover 132 is used to protect the impurity removal grate 130 to prevent materials from entering the vibrator 131 .

[0056] like Figure 4 As shown, optionally, the medium adding system is further provided with a controller 5, which is respectively connected to the medium powder suction cup 120, the delivery pump 141, the blower 310, the first clean water valve 111, the liquid level sensor 150, the density sensor 210, the second clean water valve 221, the motor 410 and the vibrator 131.

[0057] Specifically, in the concentrated medium preparation process, the amount of concentrated medium required is calculated by the amount of washed coal, and then the amount of clean water and the amount of medium powder required can be calculated. The amount of clean water required corresponds to the liquid level in the medium barrel 1 according to the actual working condition, and the liquid level sensor 150 is set. And the amount of medium powder sucked in the medium powder suction cup 120 is set. The controller 5 controls the opening and closing of the first clean water valve 111 by receiving the liquid level signal of the liquid level sensor 150, and controls the amount of medium powder sucked by the medium powder suction cup 120. The controller 5 controls the opening and closing of the delivery pump 141 and the second clean water valve 221 by receiving the density signal of the density sensor 210. At the same time, during the stirring process, the blower 310 and the motor 410 are controlled to be turned on to stir the material in the medium barrel 1. And the vibrator 131 is turned on regularly to vibrate the impurity removal grate 130.

[0058] The technical solution of the present application is described in detail below with reference to specific embodiments.

[0059] In this embodiment, the operation process of the coal washing plant medium adding system during specific operation is as follows:

[0060] During the concentrated medium preparation process: the amount of concentrated medium required is calculated by the amount of washed coal, and then the amount of clean water and medium powder required can be calculated. The amount of clean water required corresponds to the liquid level in the medium barrel 1 according to the actual working conditions, and the liquid level sensor 150 is set. And the amount of medium powder sucked in the medium powder suction cup 120 is set. The controller 5 first opens the first clean water valve 111 and adds clean water to the medium barrel 1. The liquid level sensor 150 transmits the detected liquid level signal to the controller 5 in real time. When the liquid level signal received by the controller 5 from the liquid level sensor 150 is equal to the preset liquid level value, the controller 5 closes the first clean water valve 111. At the same time, the medium powder suction cup 120 is opened to absorb the preset amount of medium powder, and the medium powder is put into the medium barrel 1.

[0061] Mixing and stirring: The controller 5 turns on the blower 310 and the motor 410 to stir the material in the medium barrel 1. The blower 310 provides power, and the gas is transported to the hollow shaft 440 through the blast line 320, and then transported to the inside of the multiple stirring shafts 450, and finally ejected from the multiple jet holes 461 of the jet cone 460. In this process, the motor 410 drives the first bevel gear 420 to rotate, the first bevel gear 420 drives the second bevel gear 430 meshing therewith to rotate, the second bevel gear 430 rotates to drive the hollow shaft 440, and the hollow shaft 440 drives the multiple stirring shafts 450 to rotate. In this way, the stirring shaft 450 ejects gas in the process of rotating with the hollow shaft 440, and the gas has a certain power when ejecting. In this way, through the action of the airflow, the material in the medium barrel 1 can be stirred, and the clean water and the medium powder are evenly mixed, and a concentrated medium is obtained in the medium barrel 1.

[0062] Washing: Add coal to the medium suspension barrel 2, and start the delivery pump 141 through the controller 5 to transfer the concentrated medium in the medium barrel 1 to the medium suspension barrel 2. The controller 5 receives the density signal from the density sensor 210 in real time. If the density signal received by the controller 5 is greater than the preset density value, the second clean water valve 221 is opened to add water to the medium suspension barrel 2 to reduce the density in the medium suspension barrel 2. If the density signal received by the controller 5 is less than the preset density value, the delivery pump 141 is turned on to add concentrated medium to the medium suspension barrel 2 until the density in the medium suspension barrel 2 is within the preset range.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements 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 application.

Claims

1. A coal washing plant medium adding system, characterized in that: include: A medium barrel (1), a medium suspension barrel (2) and an air-blast stirring device; The top of the medium barrel (1) is connected to a first clean water pipeline (110) and a medium powder suction cup (120); a de-impurity grate (130) is fixedly arranged at the upper part of the medium barrel (1); the discharge port of the medium barrel (1) and the concentrated medium inlet of the medium suspension barrel (2) are connected via a concentrated medium delivery pipeline (140); and a delivery pump (141) is arranged on the concentrated medium delivery pipeline (140); The blast stirring device comprises a blower (310) and a blast pipeline (320), wherein the blower (310) is arranged on the blast pipeline (320), one end of the blast pipeline (320) is connected to the atmosphere or to an inert gas main pipe, and the other end of the blast pipeline (320) passes through the bottom of the medium barrel (1) and extends into the medium barrel (1).

2. The coal washing plant medium adding system according to claim 1, characterized in that: The first clean water pipeline (110) is provided with a first clean water valve (111), and the medium barrel (1) is provided with a liquid level sensor (150).

3. The coal washing plant medium adding system according to claim 1, characterized in that: A density sensor (210) is arranged in the medium suspension barrel (2), and the medium suspension barrel (2) is also connected to a second clean water pipeline (220), and a second clean water valve (221) is arranged on the second clean water pipeline (220).

4. The coal washing plant medium adding system according to claim 1, characterized in that: The blast stirring device further comprises: a motor (410), a first bevel gear (420), a second bevel gear (430), a hollow rotating shaft (440), a plurality of stirring shafts (450) and an air jet cone (460); The motor (410) is arranged at the bottom of the medium barrel (1), the first bevel gear (420) is fixedly connected to the output shaft of the motor (410), the second bevel gear (430) is fixedly sleeved on the outside of the hollow rotating shaft (440), the first bevel gear (420) and the second bevel gear (430) are vertically meshed and connected, one end of the hollow rotating shaft (440) is rotatably connected to the blast pipeline (320), the other end of the hollow rotating shaft (440) vertically extends into the interior of the medium barrel (1), the outside of the hollow rotating shaft (440) is connected to a plurality of the stirring shafts (450), one end of the stirring shaft (450) away from the hollow rotating shaft (440) is connected to the jet cone (460), and the jet cone (460) is provided with a plurality of jet holes (461).

5. The coal washing plant medium adding system according to claim 4, characterized in that: A plurality of the air injection holes (461) are hingedly connected with air hole covers.

6. The coal washing plant medium adding system according to claim 4, characterized in that: The plurality of air injection holes (461) are in a truncated cone shape, and the end with a smaller diameter faces the outside of the air injection cone (460).

7. The coal washing plant medium adding system according to claim 4, characterized in that: A plurality of the jet cones (460) are arranged on the stirring shaft (450) at equal distances along the length direction.

8. The coal washing plant medium adding system according to claim 1, characterized in that: A vibrator (131) is provided at the bottom of the impurity removing grate (130), and a protective cover (132) is provided on the periphery of the vibrator (131).

9. The coal washing plant medium adding system according to any one of claims 1 to 8, characterized in that: The medium adding system is further provided with a controller (5), and the controller (5) is respectively connected to the medium powder suction cup (120), the delivery pump (141), the blower (310), the first clean water valve (111), the liquid level sensor (150), the density sensor (210), the second clean water valve (221), the motor (410) and the vibrator (131).

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