Collection type vertical mill air distribution device

Abstract

The invention belongs to the technical field of vertical mill air distribution devices, and particularly relates to an integrated vertical mill air distribution device. An integrated vertical mill air distribution device comprises a shell, an air inlet assembly, an air outlet assembly, an air mixing assembly and a control system. The air inlet assembly comprises a spiral air collecting pipe arranged in an inner cavity of the shell, a plurality of air inlet pipes fixedly arranged in the shell in a penetrating mode and communicated with the air collecting pipe, and corresponding control valves. The air outlet assembly comprises an air outlet pipe communicated with the inner cavity of the shell and an air outlet detection device arranged on the air outlet pipe; the air mixing assembly comprises a first air mixing plate arranged towards an air outlet of the air collecting pipe and a second air mixing plate arranged above the air collecting pipe. The air outlet detection device feeds back obtained gas data to the control system in real time, and the control system adjusts the gas data by controlling the opening degree of each control valve. According to the invention, various gases can be uniformly mixed, the gas temperature is uniform, and the mixed gas can be monitored and adjusted in real time.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of air distribution devices for vertical mills, and particularly relates to a collection type air distribution device for vertical mills. BACKGROUND

[0002] The working principle of a vertical mill is that a main motor drives a grinding disc to rotate through a speed reducer, material falls from a feeding port to the center of the grinding disc and moves from the center to the edge of the grinding disc under the action of centrifugal force, and is crushed into powder by a grinding roller when passing through a grinding roller area, and hot air of an existing air distribution device enters the inside of the mill through an air inlet, and the crushed material is taken away by a strong airflow at an air ring and enters a powder collector through a powder classifier.

[0003] The working principle and structure of a vertical mill determine that the vertical mill needs to be connected to an air inlet by an air distribution device, and the required hot air is blown into the inside of the mill through the air inlet by the air distribution device. In some working conditions, the air inlet temperature and gas composition need to be controlled to ensure the working efficiency and safety of the vertical mill.

[0004] The existing air distribution device, such as the utility model patent with the patent name of a slag vertical mill auxiliary airflow mixing device and the authorization announcement number of CN219291639U, discloses a slag vertical mill auxiliary airflow mixing device, which comprises a hot blast stove, the outlet end of the hot blast stove is fixedly connected with a first hot air pipe, the top end of the first hot air pipe is fixedly connected with a first electromagnetic valve, the top end of the first electromagnetic valve is fixedly connected with a second hot air pipe, the right end of the second hot air pipe is fixedly connected with a wind collecting box, the back surface of the wind collecting box is fixedly connected with a main hot air pipe, and the front surface of the wind collecting box is fixedly connected with a hot air branch pipe. The utility model pre-mixes all the airflows entering the slag vertical mill in the wind collecting box, buffers the temperature and speed of the mixed gas in advance, thereby avoiding the reduction of yield and quality caused by uneven air temperature and unstable airflow, and simultaneously, the air pressure gauge and the temperature gauge on the temperature and pressure monitor enable the user to intuitively judge the pressure and temperature of the mixed gas in the wind collecting box.

[0005] However, the existing air distribution device has one or more of the following problems: (1) The traditional air distribution device for vertical mills, i.e. the air inlet front device (such as a hot air pipeline), can only provide a single gas (such as air), and cannot flexibly switch or mix multiple gases (such as air and nitrogen), which is difficult to meet the safe grinding requirements of flammable and explosive materials.

[0006] (2) In order to save energy, in the existing vertical mill processing process, part of the high-temperature gas discharged from the outlet of the vertical mill is recycled to improve the initial temperature of the air inlet, but the high-temperature gas discharged from the outlet of the vertical mill carries part of the water vapor evaporated from the material. The existing temperature and humidity control relies on simple valve adjustment of hot air flow, which has low precision and is easily affected by air source fluctuations, resulting in unstable material drying effect and affecting the grinding efficiency. In addition, there is also a lack of integrated gas mixing and temperature control system, which cannot dynamically adjust the gas composition and temperature according to the material characteristics.

[0007] (3) The air flow mixing structure of the air distribution device in the prior art has poor uniformity and low mixing efficiency, resulting in differences in material drying effect, thereby reducing the material drying efficiency and drying quality. SUMMARY

[0008] To solve at least one of the technical problems in the prior art, the present application provides a set type vertical mill air distribution device which can uniformly mix multiple gases, uniformly control the temperature of the gases, and monitor and adjust the mixed gases in real time to achieve closed-loop control.

[0009] To achieve the above-mentioned purpose, the present application provides the following technical solutions: A set type vertical mill air distribution device, comprising: A housing: hollow inside and sealed at both ends; An air inlet assembly: comprising a spiral air collecting pipe arranged at the lower part of the inner cavity of the housing, a plurality of air inlet pipes fixedly penetrating the housing and communicating with the air collecting pipe, and a control valve arranged at the air inlet of each air inlet pipe, the control valve being connected to a gas source; An air outlet assembly: comprising an air outlet pipe arranged at the upper part of the housing and communicating with the inner cavity of the housing, and an air outlet detection device arranged at the air outlet of the air outlet pipe, the air outlet detection device communicating with the air inlet of the vertical mill; An air mixing assembly: comprising a first air mixing plate arranged towards the air outlet of the air collecting pipe and a second air mixing plate fixed above the air collecting pipe, a plurality of air mixing holes being formed in the first air mixing plate and the second air mixing plate; A control system: electrically connected to the control valves and the air outlet detection device, the air outlet detection device feeding back the obtained gas data to the control system in real time, and the control system adjusting the gas data by controlling the opening degree of each control valve.

[0010] Preferably, the first air mixing plate is a curved surface structure and has a plurality of portions arranged in sequence around the center of the housing.

[0011] Preferably, a support plate is fixedly connected in the inner cavity of the housing below the first air mixing plate, the air collecting pipe is fixedly embedded in the support plate, and the air outlet of the air collecting pipe is located above the support plate.

[0012] Preferably, the inner side of the shell at the first mixing plate is in a circular arc structure.

[0013] Preferably, a third mixing plate is fixedly connected to the inner circumference of the shell above the second mixing plate, and the third mixing plate is provided with a plurality of air mixing holes.

[0014] Preferably, the air mixing holes of the second mixing plate and the air mixing holes of the third mixing plate are staggered.

[0015] Preferably, a convex plate is formed by bending upward on the second mixing plate, a gap is arranged between every two convex plates, air mixing holes are formed on both sides of the convex plate, and the air mixing holes are communicated with the upper and lower spaces of the second mixing plate.

[0016] Preferably, a concave plate is formed by bending downward on the second mixing plate between every two convex plates, and air mixing holes are formed between the upper end surface of the concave plate and the lower end surface of the convex plate.

[0017] Preferably, the second mixing plate and the third mixing plate are the same in structure.

[0018] Compared with the prior art, the present application has the following advantages: 1. By connecting a plurality of air inlet pipes to the air collecting pipe, a plurality of gases can be connected at the same time, and the composition of the mixed gas can be controlled by setting the control valve, the gas detection device and the control system, thereby improving the safety of the vertical mill during operation and reducing the production cost.

[0019] 2. By setting the spiral air collecting pipe, the curved first mixing plate, the second mixing plate and the third mixing plate which are staggered, the mixed gas is dispersed and mixed multiple times, thereby making the plurality of gases mix uniformly before entering the vertical mill, greatly improving the safety of the vertical mill production, avoiding possible local spontaneous combustion, avoiding maintenance and repair due to this, improving production efficiency and reducing losses; in addition, the mixing of various gases and hot air blown out by the hot blast stove is more sufficient, the gas temperature is uniform, the drying effect on the material is uniform, and the production efficiency is improved.

[0020] 3. The air inlet pipe and the air collecting pipe are simple in structure and have strong adaptability, and after simple modification, they can adapt to air inlet pipes in various directions, thereby reducing the overall occupied area and having strong adaptability.

[0021] 4. The interfaces of the control valve and the gas detection device can adopt standard interfaces, and the sensor equipment can be freely selected for installation, realizing rapid customization, improving the universality and maintenance convenience, and reducing the equipment building cost. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The figure is a schematic diagram of the three-dimensional structure of the embodiment of the present application.

[0023] Figure 2 is a top view structural schematic diagram of an embodiment of the present application.

[0024] Figure 3 is a half cutaway perspective structural schematic diagram of an embodiment of the present application.

[0025] Figure 4 is a cutaway front view structural schematic diagram of Figure 3

[0026] Figure 5 is a structural schematic diagram of an air inlet assembly, air mixing assembly and part of a shell of an embodiment of the present application.

[0027] Figure 6 is a top view structural schematic diagram of Figure 5

[0028] Figure 7 is a structural schematic diagram of an air inlet assembly of an embodiment of the present application.

[0029] Figure 8 is a structural schematic diagram of a first air mixing plate of an embodiment of the present application.

[0030] Figure 9 is a structural schematic diagram of a second air mixing plate of an embodiment of the present application.

[0031] Figure 10 is an enlarged structural schematic diagram of A of Figure 9

[0032] In the figure: 1, outer shell, 11, upper outer shell, 111, upper outer shell through hole, 12, lower outer shell, 121, lower outer shell through hole, 13, support plate, 131, avoidance through slot, 2, air inlet assembly, 21, air collection pipe, 211, sealing plate, 22, air inlet pipe, 23, control valve, 3, air outlet assembly, 31, air outlet pipe, 32, air outlet detection device, 4, air mixing assembly, 41, first air mixing plate, 411, air mixing hole one, 42, second air mixing plate, 421, air mixing hole two, 422, convex plate, 423, concave plate, 43, third air mixing plate, 431, air mixing hole three, 5, control system. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0034] ​​​In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Embodiments

[0035] Referring to the drawings Figures 1 to 4 As shown in the drawings, a collective type vertical mill air distribution device includes a shell 1, an air inlet assembly 2, an air outlet assembly 3, an air mixing assembly 4 and a control system 5.

[0036] Specifically, the shell 1 is a hollow structure with sealed upper and lower ends, and its internal space can be cylindrical. In this embodiment, in order to facilitate the assembly of the air inlet assembly 2, the air outlet assembly 3, the air mixing assembly 4 and the shell 1, the shell 1 is composed of an upper shell 11 and a lower shell 12, and the lower end opening of the upper shell 11 is fixedly connected to the upper end opening of the lower shell 12 by welding or other existing methods.

[0037] Referring to the drawings Figure 7 As shown in the drawings, the air inlet assembly 2 includes a wind collecting pipe 21, an air inlet pipe 22 and a control valve 23.

[0038] The wind collecting pipe 21 is arranged in the lower part of the inner cavity of the shell 1. In this embodiment, the wind collecting pipe 21 is arranged in the lower shell 12, and the wind collecting pipe 21 has a spiral structure extending upward, and an opening communicating with the inner cavity of the lower shell 12 is arranged at the upper end of the wind collecting pipe 21, and a sealing plate 211 is welded at the lower end opening of the wind collecting pipe 21, so as to seal the lower end opening of the wind collecting pipe 21.

[0039] The air inlet pipe 22 can be provided with a plurality of air inlet pipes according to specific application scenarios, such as three air inlet pipes in this embodiment. A corresponding number of lower shell through holes 121 are formed on the circumference of the lower shell 12, each air inlet pipe 22 is arranged in a corresponding lower shell through hole 121 and is welded to the wind collecting pipe 21, and each air inlet pipe 22 communicates with the wind collecting pipe 21.

[0040] The end of each air inlet pipe 22 away from the wind collecting pipe 21 (i.e. the air inlet of the air inlet pipe 22) is connected to the air outlet of the control valve 23, and the air inlet of the control valve 23 is connected to an air source (not shown in the figure), such as a hot blast stove, air and nitrogen, etc. The control valve 23 is a prior art, such as an automatic control air control valve, i.e. the control system 5 is electrically connected to and controls the on-off and opening degree of the control valve 23, so as to control the on-off and gas flow of the gas from the air source into the air inlet pipe 22.

[0041] Referring to the drawings Figure 5As shown, in order to realize the fixation and support of the air collecting pipe 21, in other embodiments, the air collecting pipe 21 can be fixed in the inner cavity of the lower shell 12 through the existing support structure such as angle steel. Further, in the present embodiment, in order to seal the air outlet of the air collecting pipe 21 with the inner cavity of the lower shell 12, and avoid the mixed gas in the air collecting pipe 21 flowing to the lower shell 12, thereby causing uneven mixing of gas and uneven temperature, in the present embodiment, a disc-shaped support plate 13 is horizontally welded at the lower part of the upper shell 11, the outer circumference of the support plate 13 is welded on the inner circumference of the upper shell 11 and a seal is formed therebetween, so that the cavities above and below the support plate 13 are isolated. An avoiding through slot 131 is formed on the support plate 13 according to the shape of the air collecting pipe 21, the air collecting pipe 21 is embedded in the avoiding through slot 131, and the outer surface of the air collecting pipe 21 is fixed on the support plate 13 by welding. It should be noted that the outer circumference of the air collecting pipe 21 and the support plate 13 are sealed, so that the cavities above and below the support plate 13 are isolated.

[0042] Referring to Figure 3 、 4 As shown, the air mixing assembly 4 includes a first air mixing plate 41, a second air mixing plate 42 and a third air mixing plate 43. The first air mixing plate 41 is vertically arranged towards the air outlet direction of the air collecting pipe 21. The second air mixing plate 42 and the third air mixing plate 43 are both disc-shaped structures, and the outer circumferences of the second air mixing plate 42 and the third air mixing plate 43 are both welded on the inner circumference of the upper shell 11. The second air mixing plate 42 is arranged above the air collecting pipe 21, and the third air mixing plate 43 is arranged above the second air mixing plate 42. A certain distance is provided between the second air mixing plate 42 and the third air mixing plate 43. A plurality of air mixing holes one 411, air mixing holes two 421 and air mixing holes three 431 are respectively formed on the first air mixing plate 41, the second air mixing plate 42 and the third air mixing plate 43. The mixed gas from the air outlet of the air collecting pipe 21 enters the air outlet assembly 3 through the air mixing holes one 411, the air mixing holes two 421 and the air mixing holes three 431 in sequence.

[0043] Referring to Figure 5 、 6 , 8, specifically, the first air mixing plate 41 is a curved surface structure and is vertically arranged around the central axis of the upper shell 11. In the present embodiment, the first air mixing plate 41 is provided with four, which can be welded on the inner circumference of the upper shell 11 or on the end face of the support plate 13. The bending direction of each first air mixing plate 41 is towards the inner side of the upper shell 11, that is, as shown in Figure 6As shown, from a top-down perspective, the cross-sections of two adjacent first air mixing plates 41 near the central axis of the upper housing 11 form a certain angle a, which can be selected from 40-60°. In this embodiment, a is preferably 50°. The four first air mixing plates 41 are arranged in a spiral structure, and each first air mixing plate 41 is uniformly distributed in the horizontal and vertical directions and has waist-shaped air mixing holes 411 extending therethrough. As a result, the gas from each air inlet pipe 22 is initially mixed within the air collecting pipe 21. Then, relying on the inertia of the incoming air, it sequentially impacts the four first air mixing plates 41 and passes through the air mixing holes 411, undergoing turbulent mixing. In this embodiment, by providing the first air mixing plates 41 with a curved structure, which cooperates with the inner circumference of the upper housing 11 where the first air mixing plates are provided, it is convenient to guide the mixed gas exiting the air collecting pipe 21 and increase the contact area between the gas and the first air mixing plates 41.

[0044] See also Figure 9 、 10 As shown, the second air mixing hole 421 is located in the middle of the second air mixing plate 42. The second air mixing plate 42 is provided with multiple rows of upwardly bent protrusions 422, with a gap between the two protrusions 422 in each row. The protrusions 422 form the second air mixing holes 421 on either side, connecting the upper and lower spaces of the second air mixing plate 42. The protrusions 422 can be formed by stamping. The gas, turbulently mixed by the four first air mixing plates 41, impacts the lower end surfaces of the protrusions 422 due to their pressure and escapes through the second air mixing holes 421 on either side. The protrusions 422 further disperse and mix the mixed gas, thereby improving the uniformity of the mixed gas and its temperature.

[0045] Furthermore, the second air mixing plate 42 between each two convex plates 422 is bent downward to form a concave plate 423. The concave plate 423 can also be formed by stamping. A second air mixing hole 421 is formed between the upper end surface of the concave plate 423 and the lower end surface of the convex plate 422. By providing the convex plate 422 and the concave plate 423, the second air mixing hole 421 is enlarged to a certain extent, thereby increasing the air output.

[0046] In this embodiment, the second air mixing plate 42 and the third air mixing plate 43 have the same structure, namely, both include third air mixing holes 431 formed by a convex plate 422 and a concave plate 423. The third air mixing holes 431 are arranged alternately with the second air mixing holes 421. That is, the third air mixing plate 43 can be rotated 90° relative to the second air mixing plate 42 and then fixed. In this case, gas escaping through the second air mixing holes 421 of the second air mixing plate 42 can strike the third air mixing plate 43 again and escape through the third air mixing holes 431.

[0047] See also Figure 3 As shown, the air outlet component 3 includes an air outlet pipe 31 and an air outlet detection device 32.

[0048] An upper shell through hole 111 is formed on the upper shell 11 above the third mixing plate 43, the air outlet pipe 31 is inserted into the upper shell through hole 111 and welded on the upper shell 11, and the air outlet pipe 31 communicates with the inner cavity of the upper shell 11. The air outlet detection device 32 is fixedly connected to the air outlet of the air outlet pipe 31, and the air outlet pipe 31 communicates with the air inlet of the existing vertical mill through the air outlet detection device 32. The gas detection device can freely select various existing sensors (such as oxygen content sensors, gas temperature sensors, gas humidity sensors, flow sensors, etc.).

[0049] The application also comprises an existing control system 5, which is electrically connected to the control valve 23 and the air outlet detection device 32. The air outlet detection device 32 feeds back the obtained gas data to the control system 5 in real time, and the control system adjusts the gas data by controlling the opening degree and opening and closing of each control valve 23. The connection and control mode of the control system 5 with the control valve 23 and the air outlet detection device 32, the connection mode between the control valve 23 and the gas source and the air inlet pipe 22, and the connection mode between the air outlet pipe 31, the air outlet detection device 32 and the air inlet of the vertical mill are all prior art, and will not be described here.

[0050] The working process and principle of the application are as follows: According to the description, the components are installed as shown in Figure 1 The number of air inlet pipes 22 and the corresponding control valves 23 and gas sources can be adjusted according to the required gas composition for grinding materials in the vertical mill. It should be noted that the air outlet of the hot blast stove can be connected to the control valve 23 corresponding to the air inlet pipe 22 near the sealing plate 211, which can quickly heat the mixed gas and push it to move towards the outlet of the air collecting pipe 21. In this embodiment, the air collecting pipe 21 is arranged in a spiral structure, which can connect as many air inlet pipes 22 as possible under the limitation of the same shell 1 size, and can avoid the formation of turbulent flow of mixed gas in the air collecting pipe 21, so that the mixed gas can be spirally raised and discharged through the air collecting pipe 21, improving the overall flow rate and mixing speed of the mixed gas.

[0051] After the mixed gas is preliminarily mixed in the air collecting pipe 21, it enters the second layer (i.e. between the second mixing plate 42 and the support plate 13, and the first layer is set below the support plate 13) along the air collecting pipe 21. The mixed gas discharged from the air collecting pipe 21 collides with the four first mixing plates 41 in turn and passes through the corresponding mixing holes one 411 under the action of inertia, generating turbulent flow and realizing gas mixing again. Then the mixed gas hits the convex plate 422 and the concave plate 423 of the second mixing plate 42 by its own gas pressure, so that the mixed gas is again mixed after being divided into two streams and then enters the third layer (between the third mixing plate 43 and the second mixing plate 42) through the second mixing hole 421; similarly, the mixed gas in the third layer hits the third mixing plate 43 by its own gas pressure and is again mixed after being divided into two streams and then enters the fourth layer (above the third mixing plate 43) through the third mixing hole 431; at this time, the various gas components are more uniformly mixed; The mixed and uniform gas in the fourth layer flows into the vertical mill through the air outlet pipe 31 and the air outlet detection device 32, and the various detection devices of the air outlet detection device 32 detect whether the gas meets the set requirements and feed back to the control system 5; the control system 5 controls the opening and closing of each corresponding control valve 23 or the amount of gas flowing through, adjusts the gas composition, temperature or humidity, and realizes closed-loop control of the mixed gas.

[0052] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A collective vertical mill air distribution device, characterized by: include: Shell: hollow inside and sealed at both ends; An air inlet assembly includes a spiral air collecting pipe provided at the lower portion of the inner cavity of the shell, a plurality of air inlet pipes fixedly provided in the shell and connected to the air collecting pipe, and a control valve provided at the air inlet of each of the air inlet pipes, wherein the control valve is connected to an air source; Air outlet assembly: including an air outlet pipe provided on the upper portion of the shell and connected to the inner cavity of the shell, and an air outlet detection device provided at the air outlet of the air outlet pipe, wherein the air outlet detection device is connected to the air inlet of the vertical mill; An air mixing assembly comprises a first air mixing plate disposed toward the air outlet of the air collecting pipe and a second air mixing plate fixed above the air collecting pipe, wherein a plurality of air mixing holes are provided on both the first air mixing plate and the second air mixing plate; Control system: electrically connected to the control valve and the air outlet detection device, the air outlet detection device feeds back the obtained gas data to the control system in real time, and the control system adjusts the gas data by controlling the opening of each control valve.

2. The integrated vertical mill air distribution device according to claim 1, characterized in that: The first air mixing plate is a curved structure and a plurality of the first air mixing plates are sequentially arranged around the center of the shell.

3. The integrated vertical mill air distribution device according to claim 2, characterized in that: A support plate is fixedly connected to the inner cavity of the shell below the first air mixing plate, the air collecting pipe is fixedly embedded in the support plate, and the air outlet of the air collecting pipe is located above the support plate.

4. The integrated vertical mill air distribution device according to claim 3, characterized in that: The inner side surface of the shell where the first air mixing plate is arranged is an arc-shaped structure.

5. The integrated vertical mill air distribution device according to claim 1, characterized in that: A third air mixing plate is fixedly connected to the inner circumference of the shell above the second air mixing plate, and the third air mixing plate is provided with a plurality of air mixing holes.

6. The integrated vertical mill air distribution device according to claim 5, characterized in that: The air mixing holes of the second air mixing plate and the air mixing holes of the third air mixing plate are arranged alternately.

7. The integrated vertical mill air distribution device according to any one of claims 1 to 6, characterized in that: The second air mixing plate is provided with an upwardly bent convex plate, a gap is provided between every two convex plates, and air mixing holes are formed on both sides of the convex plates, and the air mixing holes communicate with the upper and lower spaces of the second air mixing plate.

8. The integrated vertical mill air distribution device according to claim 7, characterized in that: The second air mixing plate between every two convex plates is bent downward to form a concave plate, and an air mixing hole is formed between the upper end surface of the concave plate and the lower end surface of the convex plate.

9. The integrated vertical mill air distribution device according to claim 8, characterized in that: The second air mixing plate has the same structure as the third air mixing plate.

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