A dense medium density control device for a coal preparation plant

Abstract

The application relates to the field of heavy medium density, in particular to a heavy medium density control device for a coal preparation plant, which comprises a qualified medium barrel, a lifting assembly arranged at the top of the qualified medium barrel, a stirring assembly arranged at the top of the lifting assembly and having a stirring end suspended above the bottom of the qualified medium barrel, a blending barrel communicated with the qualified medium barrel, and a thick medium barrel communicated with the blending barrel; the stirring assembly comprises a first stirring blade group and a second stirring blade group arranged in an upper-lower interval, the first stirring blade group is suspended above the bottom of the qualified medium barrel and pushes liquid to the barrel bottom, and the second stirring blade group is suspended above the first stirring blade group and pushes liquid to the barrel opening, so that the heavy suspension density in the qualified medium barrel is kept stable.

Description

Technical Field

[0001] This application relates to the field of heavy medium density, and in particular to a heavy medium density control device for a coal preparation plant. Background Technology

[0002] Currently, with the continuous development of coal preparation technology, large-scale coal preparation plants, diversified systems, and refined management have become the main trends. Coal preparation plant heavy medium density control refers to the separation of coal and gangue under the action of heavy medium by adjusting the specific density of heavy medium and controlling the flow rate of heavy medium, thereby achieving the purpose of coal separation and purification.

[0003] Existing methods for controlling the density of heavy media suspensions typically involve a qualified medium tank and a concentrated medium tank. The qualified medium tank contains the prepared heavy media suspension. Because the density of the heavy media suspension needs to maintain good stability, a stirring device is usually used to continuously stir the heavy media suspension in the qualified medium tank. Commonly used stirring devices include a stirring shaft and a stirring rod fixedly mounted at the lower end of the stirring shaft.

[0004] The existing technical solutions mentioned above have the following drawbacks: during the continuous stirring of the heavy suspension in the qualified medium tank by the stirring rod, the heavy medium is prone to sedimentation, which causes the density of the heavy suspension to change, which is not conducive to the coal preparation of the heavy suspension. Utility Model Content

[0005] This application provides a heavy medium density control device for coal preparation plants to maintain the stability of the heavy suspension density in a qualified medium tank.

[0006] The above-mentioned technical objective of this application is achieved through the following technical solution:

[0007] A coal preparation plant heavy medium density control device includes a qualified medium tank, a lifting assembly disposed on the top of the qualified medium tank, a stirring assembly disposed on the top of the lifting assembly with its stirring end suspended above the inner bottom of the qualified medium tank, a mixing tank communicating with the qualified medium tank, and a concentrated medium tank communicating with the mixing tank.

[0008] The stirring assembly includes a first stirring blade group and a second stirring blade group arranged at intervals. The first stirring blade group is suspended above the bottom of the qualified medium tank and pushes the liquid towards the bottom of the tank. The second stirring blade group is suspended above the first stirring blade group and pushes the liquid towards the opening of the tank.

[0009] By adopting the above technical solution, when the first stirring blade group rotates, it pushes the liquid towards the bottom of the tank, disturbing the medium with a tendency to settle. The liquid, constrained by the bottom and body of the tank, can flow upwards. When the second stirring blade group rotates, it pushes the liquid upwards, providing further upward force to the liquid flowing upwards from the bottom, thereby reducing the tendency of heavy media in the liquid to settle. The lifting assembly allows the stirring assembly to perform repeated and stable lifting movements on the qualified medium tank, enabling the first and second stirring blade groups to continuously stir the liquid at different heights within the qualified medium tank, further improving the stability of the density of the heavy suspension within the qualified medium tank.

[0010] Optionally, the stirring assembly includes a mounting base fixed to the top of the lifting assembly, a rotating shaft vertically arranged on the mounting base, and a rotating tube rotatably arranged on the mounting base and sleeved outside the rotating shaft. A first stirring blade assembly is installed at the lower end of the rotating shaft, and a second stirring blade assembly is installed at the lower end of the rotating tube.

[0011] By adopting the above technical solution, after the rotating tube is sleeved on the rotating shaft, the two sets of stirring blades can rotate coaxially, which can not only make reasonable use of the limited space in the qualified medium tank, but also increase the two sets of stirring blades to fully stir the liquid in the qualified medium tank.

[0012] Optionally, the stirring assembly further includes a first motor mounted on the top of the lifting assembly, a first bevel gear rotating on the output shaft of the first motor, a second bevel gear sleeved and fixed on the rotating shaft and meshing with the first bevel gear, and a third bevel gear sleeved and fixed on the upper end of the rotating tube and meshing with the first bevel gear.

[0013] By adopting the above technical solution, the first and second stirring blade groups can be stirred simultaneously using the same power source, saving costs while also allowing the liquid to be disturbed synchronously.

[0014] Optionally, the lifting assembly includes a fixed cylinder with its lower end fixed to the top of the qualified medium tank, a lifting cylinder slidably inserted into the upper end of the fixed cylinder, a connecting plate rotatably connected to the upper end of the lifting cylinder, a support spring vertically arranged and fixed at both ends to the lower surface of the connecting plate and the top of the qualified medium tank, a second motor installed on the top of the qualified medium tank, and a gear installed on the output shaft of the second motor. The gear meshes with the lifting cylinder and drives the lifting cylinder to move up and down inside the fixed cylinder.

[0015] By adopting the above technical solution, the lifting component has a compact overall structure, which can not only drive the stirring component to lift, but also maintain its own stability and continuity during the lifting process.

[0016] Optionally, the outer wall of the lifting cylinder is provided with a spiral-shaped annular limiting groove, and the output shaft of the second motor is slidably inserted into the limiting groove;

[0017] Multiple fixed balls are arranged in a spiral pattern on the outer wall of the lifting cylinder and located in the limiting groove. The fixed balls mesh with gears.

[0018] By adopting the above technical solution, continuous and stable lifting motion can be formed within a limited lifting height.

[0019] Optionally, a bearing is provided at the bottom of the connecting plate, the outer ring of the bearing is fixedly connected to the connecting plate, and the inner ring of the bearing is sleeved and fixedly connected to the upper end of the lifting cylinder.

[0020] By adopting the above technical solution, the lifting cylinder and the connecting plate can be stably connected, while ensuring the smooth rotation of the lifting cylinder.

[0021] Optionally, the support spring is fitted with a sleeve, the upper end of which is fixed to the connecting plate, and the lower end of which is suspended above the top of the qualified medium tank.

[0022] By adopting the above technical solution, the sleeve can limit the support spring with a certain length, thereby enabling the support spring to support the connecting plate more stably.

[0023] Optionally, the control device also includes a PLC processor. A discharge pipe is fixedly connected to the qualified medium tank. A first solenoid valve electrically connected to the PLC processor is installed on the discharge pipe. Two first density sensors electrically connected to the PLC processor are installed at intervals inside the qualified medium tank. A medium-adding pipe is installed on the outer wall of the qualified medium tank. A first medium-adding pump electrically connected to the PLC processor is installed on the medium-adding pipe. The medium-adding pipe connects the qualified medium tank and the mixing tank.

[0024] By adopting the above technical solution, the liquid density in the qualified medium tank can be monitored in real time by acquiring data from the first density sensor through the PLC processor, and the liquid can be replenished to the qualified medium tank in a timely manner by the medium pump, thereby maintaining the stability of the liquid density.

[0025] Optionally, a water pipe is installed on the mixing tank, and a water pump, a second solenoid valve, and a first flow meter, all electrically connected to the PLC processor, are installed on the water pipe. A second density sensor electrically connected to the PLC processor is installed inside the mixing tank. The first flow meter is arranged close to the mixing tank, and the second solenoid valve is located between the water pump and the first flow meter.

[0026] By adopting the above technical solution, the influent volume can be accurately controlled, which facilitates the dilution and adjustment of the density of the heavy suspension.

[0027] Optionally, a connecting pipe is provided outside the concentrated medium tank, and a second flow meter, a second medium-adding pump, and a third solenoid valve are all electrically connected to the PLC processor on the connecting pipe. The second flow meter is arranged close to the mixing tank, the third solenoid valve is arranged close to the concentrated medium tank, and the second medium-adding pump is located between the second flow meter and the third solenoid valve.

[0028] In summary, this application has the following technical effects:

[0029] 1. By setting up a qualified medium tank, a lifting assembly, a stirring assembly, a mixing tank, a concentrated medium tank, as well as a first stirring blade group and a second stirring blade group, the stirring blade group reduces the tendency of heavy medium in the liquid to precipitate, and the lifting assembly enables the first stirring blade group and the second stirring blade group to continuously stir the liquid at different heights in the qualified medium tank, further improving the stability of the density of the heavy suspension in the qualified medium tank.

[0030] 2. By setting up a mounting base, a rotating shaft, and a rotating pipe, the rotating pipe can be sleeved on the rotating shaft, enabling the two sets of stirring blades to rotate coaxially. This not only makes reasonable use of the limited space inside the qualified medium tank, but also increases the stirring capacity of the two sets of stirring blades to fully stir the liquid inside the qualified medium tank.

[0031] 3. By setting up a first motor, a first bevel gear, a second bevel gear, and a third bevel gear, the first stirring blade group and the second stirring blade group can be stirred simultaneously using the same power source, saving costs while also allowing the liquid to be disturbed synchronously. Attached Figure Description

[0032] Figure 1 This is a structural diagram of the object of this application;

[0033] Figure 2 This is a cross-sectional structural diagram of a qualified media container;

[0034] Figure 3 This is a side view of the lifting assembly and the stirring assembly;

[0035] Figure 4 It is a diagram showing the assembly structure of the lifting cylinder, the fixed cylinder, and the gears;

[0036] Figure 5 It is a cross-sectional structural diagram of the mixing tank;

[0037] Figure 6 This is a structural diagram of a concentrated medium tank.

[0038] Explanation of reference numerals in the attached drawings: 1. Qualified medium tank; 11. Tank lid; 12. Discharge pipe; 13. First solenoid valve; 14. First density sensor; 15. Medium supply pipe; 16. First medium supply pump; 2. Lifting assembly; 21. Support spring; 22. Sleeve; 23. Connecting plate; 24. Bearing; 25. Lifting cylinder; 251. Limiting groove; 252. Fixed ball; 253. Shock-absorbing pad; 26. Fixed cylinder; 27. First motor; 28. Gear; 3. Stirring assembly; 31. Mounting base; 32. Second motor; 33. First bevel gear; 34. Rotating shaft; 35. Second bevel gear; 36. First stirring blade assembly; 37. Rotary pipe; 38. Third bevel gear; 39. Second stirring blade assembly; 4. Mixing tank; 41. Water pipe; 42. Water pump; 43. Second solenoid valve; 44. First flow meter; 45. Second density sensor; 5. Concentrated medium tank; 51. Connecting pipe; 52. Second flow meter; 53. Second medium pump; 54. Third solenoid valve. Detailed Implementation

[0039] The present application will be further described in detail below with reference to the accompanying drawings.

[0040] This application discloses a heavy medium density control device for a coal preparation plant, referring to... Figure 1 The control device includes a qualified medium tank 1, a lifting component 2 installed on top of the qualified medium tank 1, a stirring component 3 installed on top of the lifting component 2, a mixing tank 4 connected to the qualified medium tank 1, and a concentrated medium tank 5 connected to the mixing tank 4. The stirring component 3 is vertically arranged and the stirring end is located inside the qualified medium tank 1. It can perform comprehensive and continuous stirring of the qualified density heavy suspension contained in the qualified medium tank 1, thereby controlling the qualified density heavy suspension to maintain density stability, which is beneficial for subsequent coal preparation work.

[0041] Reference Figure 2 The qualified medium tank 1 has an opening at the top, covered by a lid 11. Multiple vertical support rods are installed at the bottom of the qualified medium tank 1, and a discharge pipe 12 is fixedly connected to the bottom. A first solenoid valve 13 is installed on the discharge pipe 12, which, when opened, discharges the heavy suspension contained in the qualified medium tank 1. At least two first density sensors 14 are installed inside the qualified medium tank 1, spaced vertically along its height, enabling multi-point monitoring of the heavy suspension to ensure uniform and stable density. A medium-addition pipe 15 is fixedly connected to the outer wall of the qualified medium tank 1. One end of the medium-addition pipe 15 connects to the upper outer wall of the qualified medium tank 1 near its opening, and the other end extends into the mixing tank 4. A first medium-addition pump 16 is installed on the medium-addition pipe 15 to pump the liquid contained in the mixing tank 4 into the qualified medium tank 1.

[0042] Combination Figure 3 and Figure 4 The lifting assembly 2 includes four vertically arranged support springs 21 with their lower ends fixed to the upper surface of the bucket lid 11, sleeves 22 respectively sleeved on the four support springs 21, a horizontally arranged connecting plate 23 with its lower plate surface fixed to the upper ends of the four support springs 21 and the four sleeves 22 respectively, a bearing 24 with its outer ring sidewall fixed to the lower plate surface of the connecting plate 23, a lifting cylinder 25 with its upper outer wall inserted into the inner ring of the bearing 24 and fixed to the inner wall of the inner ring, a fixed cylinder 26 fixedly arranged on the upper surface of the bucket lid 11 and movably sleeved on the lower end of the lifting cylinder 25, a first motor 27 fixedly arranged on the bucket lid 11, and a gear 28 installed on the output shaft of the first motor 27. The gear 28 is used to drive the lifting cylinder 25 to perform lifting and lowering actions.

[0043] Reference Figure 4 A closed annular limiting groove 251 is provided on the outer wall of the lifting cylinder 25. The limiting groove 251 is spirally shaped around the axis of the lifting cylinder 25. The end of the output shaft of the first motor 27 is embedded and slidably disposed in the opening of the limiting groove 251. Several fixed balls 252 are fixedly disposed on the outer wall of the lifting cylinder 25 inside the limiting groove 251. The fixed balls 252 are also spirally shaped and spaced apart. The teeth of two adjacent teeth on the gear 28 can mesh with the fixed balls 252. Thus, when the first motor 27 drives the gear 28 to rotate, the limiting groove 251 limits the output shaft of the first motor 27 and causes the output shaft to slide back and forth in the annular limiting groove 251. The gear 28 causes the lifting cylinder 25 to rise and fall through the fixed balls 252.

[0044] Reference Figure 3 The stirring assembly 3 includes a mounting base 31 fixedly mounted on the upper surface of the connecting plate 23; a second motor 32 fixedly mounted on the connecting plate 23 with its output shaft axis parallel to the upper surface of the connecting plate 23; a first bevel gear 33 fixedly mounted on the output shaft of the second motor 32; a rotating shaft 34 vertically rotatably mounted on the mounting base 31 with its lower end located inside the qualified medium tank 1; a second bevel gear 35 sleeved and fixed on the rotating shaft 34 and meshing with the first bevel gear 33; a first stirring blade assembly 36 fixedly mounted on the lower end of the rotating shaft 34; a rotating tube 37 rotatably mounted on the mounting base 31 and sleeved outside the rotating shaft 34; a third bevel gear 38 sleeved and fixedly connected to the upper end of the rotating tube 37 and meshing with the first bevel gear 33; and a second stirring blade assembly 39 fixedly mounted on the lower end of the rotating tube 37. The second bevel gear 35 and the third bevel gear 38 are spaced apart, with the second bevel gear 35 located above the third bevel gear 38. The lower end of the rotating tube 37 is higher than the lower end of the rotating shaft 34 and is spaced apart.

[0045] The first stirring blade assembly 36 is suspended above the bottom of the qualified medium tank 1. When the first stirring blade assembly 36 rotates, it pushes the liquid towards the bottom of the tank, disturbing the medium with a tendency to settle, allowing the liquid to flow upwards despite the constraints of the bottom and body of the tank. When the second stirring blade assembly 39 rotates, it pushes the liquid upwards, providing further upward force to the liquid flowing upwards from the bottom of the tank, thereby reducing the tendency of heavy media in the liquid to settle. After the first motor 27 is started, causing the stirring assembly 3 to perform repeated and stable lifting and lowering movements on the connecting plate 23, the first stirring blade assembly 36 and the second stirring blade assembly 39 continuously stir the liquid at different heights in the qualified medium tank 1, further improving the stability of the density of the heavy suspension in the qualified medium tank 1.

[0046] Reference Figure 5 The mixing tank 4 has an opening at its top, and the lower end of the mediator 15 extends into the mixing tank 4 through the opening. Second density sensors 45 are fixedly installed at intervals along the height of the inner wall of the mixing tank 4 for real-time detection of the liquid density inside the mixing tank 4. A water pipe 41 is fixedly connected to the upper part of the outer wall of the mixing tank 4. One end of the water pipe 41 connects to the inside of the mixing tank 4, and the other end connects to an external water source. A water pump 42, a second solenoid valve 43, and a first flow meter 44 are installed at intervals along the length of the water pipe 41. The first flow meter 44 is close to the mixing tank 4 and spaced apart from it. The second solenoid valve 43 is located between the water pump 42 and the first flow meter 44. When the water pump 42 is energized, it opens the second solenoid valve 43, allowing external water to enter the mixing tank 4 through the water pipe 41. The first flow meter 44 can detect the amount of water entering the mixing tank 4, thus facilitating the dilution and mixing of water and heavy media.

[0047] Reference Figure 6 Multiple support rods are evenly arranged on the bottom of the concentrated medium tank 5, so that the bottom of the concentrated medium tank 5 is suspended above the ground. A connecting pipe 51 is provided on the concentrated medium tank 5. One end of the connecting pipe 51 is fixed to and connected to the bottom of the concentrated medium tank 5, and the other end is fixed to and connected to the side wall of the mixing tank 4 near the opening. A second flow meter 52, a second medium injection pump 53 and a third solenoid valve 54 are fixedly arranged at intervals along the length of the connecting pipe 51. The second flow meter 52 is arranged close to the mixing tank 4, the third solenoid valve 54 is arranged close to the concentrated medium tank 5, and the second medium injection pump 53 is located between the second flow meter 52 and the third solenoid valve 54.

[0048] The control device also includes a power supply and a PLC processor. The power supply provides power to the solenoid valves, sensors, motors, pumps, flow meters, etc., ensuring their normal operation. The PLC processor is electrically connected to the solenoid valves, sensors, motors, pumps, and flow meters, respectively, to control the start and stop of each component, thereby enabling the control device to conveniently control the density of the heavy suspension. When the first density sensor 14 detects that the density of the heavy suspension in the qualified medium tank 1 is higher or lower than the qualified standard, it can control the concentrated medium tank 5 to deliver concentrated medium to the mixing tank 4 and inject water into the mixing tank 4 to dilute and mix the concentrated medium. Then, the diluted concentrated medium is introduced into the qualified medium tank 1, thus completing the heavy suspension density control process.

[0049] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A heavy medium density control device for a coal preparation plant, characterized in that: It includes a qualified medium tank (1), a lifting assembly (2) set on the top of the qualified medium tank (1), a stirring assembly (3) set on the top of the lifting assembly (2) with the stirring end suspended above the bottom of the qualified medium tank (1), a mixing tank (4) connected to the qualified medium tank (1), and a concentrated medium tank (5) connected to the mixing tank (4). The stirring assembly (3) includes a first stirring blade group (36) and a second stirring blade group (39) arranged at intervals. The first stirring blade group (36) is suspended above the bottom of the qualified medium tank (1) and pushes the liquid towards the bottom of the tank. The second stirring blade group (39) is suspended above the first stirring blade group (36) and pushes the liquid towards the opening of the tank.

2. The heavy medium density control device for a coal preparation plant according to claim 1, characterized in that: The stirring assembly (3) includes a mounting base (31) fixed to the top of the lifting assembly (2), a rotating shaft (34) vertically arranged on the mounting base (31), and a rotating tube (37) rotatably arranged on the mounting base (31) and sleeved outside the rotating shaft (34). A first stirring blade assembly (36) is installed at the lower end of the rotating shaft (34), and a second stirring blade assembly (39) is installed at the lower end of the rotating tube (37).

3. The heavy medium density control device for a coal preparation plant according to claim 2, characterized in that: The stirring assembly (3) further includes a first motor (27) mounted on the top of the lifting assembly (2), a first bevel gear (33) rotating on the output shaft of the first motor (27), a second bevel gear (35) sleeved and fixed on the rotating shaft (34) and meshing with the first bevel gear (33), and a third bevel gear (38) sleeved and fixed on the upper end of the rotating tube (37) and meshing with the first bevel gear (33).

4. A heavy medium density control device for a coal preparation plant according to any one of claims 1 or 3, characterized in that: The lifting assembly (2) includes a fixed cylinder (26) with its lower end fixed to the top of the qualified medium tank (1), a lifting cylinder (25) slidably inserted into the upper end of the fixed cylinder (26), a connecting plate (23) rotatably connected to the upper end of the lifting cylinder (25), a support spring (21) vertically arranged and fixed at both ends to the lower plate surface of the connecting plate (23) and the top of the qualified medium tank (1), a second motor (32) installed on the top of the qualified medium tank (1), and a gear (28) installed on the output shaft of the second motor (32). The gear (28) meshes with the lifting cylinder (25) and drives the lifting cylinder (25) to move up and down inside the fixed cylinder (26).

5. The heavy medium density control device for a coal preparation plant according to claim 4, characterized in that: The outer wall of the lifting cylinder (25) is provided with a spiral-shaped annular limiting groove (251), and the output shaft of the second motor (32) is slidably inserted into the limiting groove (251). Multiple fixed balls (252) are arranged in a spiral pattern on the outer wall of the lifting cylinder (25) and in the limiting groove (251), and the fixed balls (252) mesh with the gear (28).

6. The heavy medium density control device for a coal preparation plant according to claim 4, characterized in that: The bottom of the connecting plate (23) is provided with a bearing (24), the outer ring of the bearing (24) is fixed to the connecting plate (23), and the inner ring of the bearing (24) is sleeved and fixed to the upper end of the lifting cylinder (25).

7. The heavy medium density control device for a coal preparation plant according to claim 4, characterized in that: The support spring (21) is fitted with a sleeve (22), the upper end of which is fixed to the connecting plate (23), and the lower end of which is suspended above the top of the qualified medium tank (1).

8. The heavy medium density control device for a coal preparation plant according to claim 1, characterized in that: The control device also includes a PLC processor. A discharge pipe (12) is fixedly connected to the qualified medium tank (1). A first solenoid valve (13) electrically connected to the PLC processor is installed on the discharge pipe (12). Two first density sensors (14) electrically connected to the PLC processor are installed at intervals inside the qualified medium tank (1). A medium-adding pipe (15) is installed on the outer wall of the qualified medium tank (1). A first medium-adding pump (16) electrically connected to the PLC processor is installed on the medium-adding pipe (15). The medium-adding pipe (15) connects the qualified medium tank (1) and the mixing tank (4).

9. A heavy medium density control device for a coal preparation plant according to claim 8, characterized in that: A water pipe (41) is installed on the mixing tank (4). A water pump (42), a second solenoid valve (43), and a first flow meter (44) are all electrically connected to the PLC processor. A second density sensor (45) electrically connected to the PLC processor is installed inside the mixing tank (4). The first flow meter (44) is arranged close to the mixing tank (4). The second solenoid valve (43) is located between the water pump (42) and the first flow meter (44).

10. A heavy medium density control device for a coal preparation plant according to claim 9, characterized in that: The concentrated medium tank (5) is provided with a connecting pipe (51) on the outside. The connecting pipe (51) is provided with a second flow meter (52), a second medium pump (53) and a third solenoid valve (54), all of which are electrically connected to the PLC processor. The second flow meter (52) is arranged close to the mixing tank (4), the third solenoid valve (54) is arranged close to the concentrated medium tank (5), and the second medium pump (53) is located between the second flow meter (52) and the third solenoid valve (54).

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