Low-resistance air ring for treating high-moisture materials and vertical mill

Abstract

The invention discloses a low-resistance air ring for treating high-moisture materials and a vertical mill. The air ring comprises an air ring assembly, the air ring assembly is divided into a coarse particle powder selecting air ring and a drying hot air channel, a self-adaptive air adjusting mechanism is arranged at an outlet of the drying hot air channel, an air adjusting block is located in the drying hot air channel, the inner end of a self-adaptive assembly is connected with the air adjusting block, and the outer end of the self-adaptive assembly is connected with a driving lifting assembly. The vertical mill comprises a mill shell and further comprises the low-resistance air ring, and the air ring assembly is arranged on the periphery of the millstone assembly. The device has the beneficial effects that under the action of the self-adaptive air adjusting mechanism, the air speed in the coarse particle powder selecting air ring is kept floating in a very narrow range, the air pressure and the air speed are basically kept stable, and the particle size of selected particles is accurately controlled; redundant hot air flows through an independent drying hot air channel, the sectional area of the channel can be adjusted, and pressure loss is reduced; the overall resistance of the air ring is reduced, the particle size of coarse particles is accurately controlled, the in-mill grinding efficiency is improved, and the energy consumption of a grinding system is directly reduced.

Description

Technical Field

[0001] This application belongs to the technical field of vertical mills, and particularly relates to a low-resistance air ring and a vertical mill for treating high-moisture materials, which are applicable to vertical roller mills for powder crushing. Background Art

[0002] Reference Figure 4 As shown, the traditional vertical mill divides the grinding area inside the mill into two parts by the ventilation ring 309 (hereinafter referred to as the ventilation ring) around the grinding table. Below the ventilation ring is the outer discharge slag chamber 307, and above the ventilation ring is the main drying chamber 308 for grinding. During operation, the hot air of the drying vertical mill system enters from the outer discharge slag chamber and passes through the ventilation ring into the main drying chamber for grinding. At the same time, the initial selection of the materials thrown out from the table is carried out by using the wind speed when the hot air passes through the ventilation ring. The coarse particles fall into the outer discharge chamber and are discharged out of the mill, and the finer particles rise with the air flow and are dried.

[0003] Based on this structural principle, when the traditional vertical mill processes high-moisture materials such as slag, when the moisture content of the materials is as high as 10-20%, a large amount of hot air is required to dry the materials. The ventilation area of the traditional ventilation ring is fixed, and the amount of hot air used for drying is greater than the air volume for the initial selection of coarse particles at the ventilation ring. The mismatch problem between the amount of hot air used for drying and the ventilation area of the ventilation ring becomes prominent. The large air volume causes the wind speed at the ventilation ring to be higher than the wind speed required for the initial selection of coarse particles, resulting in an increase in the pressure loss at the ventilation ring inside the mill and an increase in the internal circulation of the mill, thereby increasing the system energy consumption. Seriously, it may also cause frequent material collapse inside the mill and unable to achieve stable production. Summary of the Invention

[0004] When the existing vertical mill grinds high-moisture materials, the ventilation area of the ventilation ring is fixed. When the moisture content of the materials changes, the drying air volume usually needs to be adjusted in real time, and accordingly the wind speed of the ventilation ring also changes. However, to accurately control the particle size of the coarse particles entering the outer circulation system after the initial selection after grinding, it is expected that the wind speed in the ventilation ring area is stable, that is, there is a contradiction problem that the change in the drying air volume causes the mismatch between the wind speed of the ventilation ring and the wind speed for the initial selection of coarse particles. In addition, the too high wind speed will also lead to an extremely high pressure loss at the ventilation ring, resulting in problems such as a large pressure loss in the entire grinding system and high energy consumption.

[0005] Based on this, this application provides a low-resistance air ring and a vertical mill for treating high-moisture materials, aiming to solve the technical problems such as the mismatch between the air volume and the initial selection wind speed, the ventilation area of the ventilation ring cannot adapt dynamically to the air volume and wind pressure, and the too high resistance of the ventilation ring leading to high system energy consumption without disturbing the existing flow field of the vertical mill.

[0006] The purpose of this application is achieved through the following technical solutions:

[0007] A low-resistance air ring for treating high-moisture materials, comprising an air ring assembly. The air ring assembly is divided into a coarse particle separation air ring in the inner layer and a drying hot air channel in the outer layer. An adaptive air regulating mechanism for adjusting the channel cross-section is provided at the outlet of the drying hot air channel. The adaptive air regulating mechanism includes an air regulating block, an adaptive component, and a driving lifting component. The air regulating block is located in the drying hot air channel. The inner end of the adaptive component is connected to the air regulating block, and the outer end of the adaptive component is connected to the driving lifting component.

[0008] Further, the coarse particle separation air ring includes a first side wall, a flow stabilizing plate, and a second side wall. A plurality of flow stabilizing plates are provided between the first side wall of the inner ring and the second side wall of the middle ring.

[0009] Further, the drying hot air channel includes the second side wall of the middle ring and the housing side wall of the outer ring.

[0010] Further, a housing sealing component for the adaptive component to lift through is provided on the housing side wall.

[0011] Further, an air-facing inclined ring surface is provided on the inner side of the air regulating block, and a wind guiding inclined ring section parallel to the air-facing inclined ring surface is provided at the outlet of the second side wall.

[0012] Further, the air regulating block has a right triangle cross-section or a right trapezoid cross-section, and the end surface where the hypotenuse of the air regulating block is located is the air-facing inclined ring surface.

[0013] Further, the adaptive component is made of an elastic material.

[0014] Further, the driving lifting component includes a lead screw and a driving module. The driving module is connected to the lead screw, and the lead screw is in threaded cooperation with the adaptive component.

[0015] A low-resistance vertical mill for treating high-moisture materials, comprising a mill housing. A grinding roller assembly and a grinding table assembly are provided inside the mill housing. It also includes the above-mentioned low-resistance air ring for treating high-moisture materials. The air ring assembly is arranged on the outer periphery of the grinding table assembly. The air ring assembly divides the interior of the mill housing into an outer discharge slag chamber in the lower part and a main grinding and drying chamber in the upper part.

[0016] Further, it also includes a separator and a column assembly. A separator is provided above the grinding roller assembly at the upper part of the mill housing. The grinding roller assembly is located on the grinding table assembly, and a column assembly is supported on the outer side of the mill housing.

[0017] Advantages of this application:

[0018] 1. Through the action of the adaptive air regulating mechanism, the air speed in the coarse particle separation air ring can be kept floating within a very narrow range, and the air pressure and air speed are basically stable, realizing precise control of the selected particle size.

[0019] 2. The excess hot air flows through an independent drying hot air channel with an adjustable cross-sectional area of the channel, achieving a reduction in pressure loss.

[0020] 3. The overall resistance of the air ring is reduced, the particle size of the coarse particles is accurately controlled, the grinding efficiency inside the mill is improved, and the energy consumption of the grinding system is directly reduced.

[0021] The main solution of the present application and its various further alternative solutions can be freely combined to form multiple solutions, all of which are solutions that can be adopted and claimed in the present application; and in the present application, (each non-conflicting alternative) alternatives can be freely combined with each other and with other alternatives. Those skilled in the art can understand that there are various combinations based on the prior art and common general knowledge after understanding the solution of the present application, all of which are the technical solutions to be protected in the present application and will not be enumerated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the present application.

[0023] Figure 2 It is a schematic structural diagram of a part of the present application.

[0024] Figure 3 It is a schematic working diagram of the present application.

[0025] Figure 4 It is a schematic structural diagram of a traditional vertical mill.

[0026] In the figure: 201 - coarse particle separation air ring, 202 - drying hot air channel, 203 - first side wall, 204 - baffle plate, 205 - second side wall, 206 - housing side wall, 207 - adaptive air regulating mechanism, 208 - air regulating block, 209 - adaptive component, 210 - driving lifting component, 211 - lead screw, 212 - driving module, 213 - housing sealing component; 301 - separator, 302 - roller assembly, 303 - table assembly, 304 - mill housing, 305 - column assembly, 306 - air ring assembly, 307 - outer discharge slag chamber, 308 - main drying chamber for grinding, 309 - ventilation ring around the table. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following non-limiting embodiments are used to illustrate the present application.

[0028] Embodiment 1

[0029] Referring to Figure 1 and Figure 2 shown, a low-resistance air ring for treating high-moisture materials includes an air ring assembly 306, and the air ring assembly 306 includes a coarse particle separation air ring 201, a drying hot air channel 202, a first side wall 203, a baffle plate 204, a second side wall 205, a housing side wall 206, and an adaptive air regulating mechanism 207.

[0030] The air ring assembly 306 is divided into the inner coarse particle separating air ring 201 and the outer drying hot air channel 202. The air ring assembly 306 divides the hot air into two streams. One stream passes through the inner layer for coarse particle separation, and the other stream passes through the outer layer for hot air drying. The air ring assembly 306 is divided into an inner and an outer air duct. The cross-sectional area of the inner air duct is relatively fixed, which is beneficial to ensuring stable air velocity and air pressure. The cross-sectional area of the outer air duct is relatively adjustable to make adaptive adjustments according to the fluctuations of the overall hot air.

[0031] The number of air ducts is not limited to two layers, and multi-layer arrangements can also be made on this basis. A number of air segments are evenly arranged along the circumferential direction of each layer of air duct. The air segments are used for specific air passage, and the structures between the air segments are airless.

[0032] An adaptive air volume adjusting mechanism 207 for adjusting the channel cross-section is provided at the outlet of the drying hot air channel 202. Through the action of the adaptive air volume adjusting mechanism 207, the cross-sectional area of the drying hot air channel 202 can be adjusted to achieve adjustment within a large range, keep the air pressure and air velocity in the coarse particle separating air ring 201 basically stable, achieve precise control of the selected particle size, and at the same time reduce the pressure loss.

[0033] The coarse particle separating air ring 201 includes a first side wall 203, a flow straightening plate 204, and a second side wall 205. Both the first side wall 203 and the second side wall 205 are circular ring structures. A number of flow straightening plates 204 are provided between the first side wall 203 of the inner ring and the second side wall 205 of the middle ring. The flow straightening plates 204 are arranged in a spiral and inclined manner to ensure the uniform flow effect. The drying hot air channel 202 includes the second side wall 205 of the middle ring and the housing side wall 206 of the outer ring. Both the second side wall 205 and the housing side wall 206 are also circular ring structures.

[0034] The adaptive air volume adjusting mechanism 207 includes an air volume adjusting block 208, an adaptive component 209, a driving lifting component 210, and a housing sealing component 213. The driving lifting component 210 includes a support, a lead screw 211, and a driving module 212.

[0035] The air volume adjusting block 208 is located in the drying hot air channel 202. The inner end of the adaptive component 209 is connected to the air volume adjusting block 208, and the outer end of the adaptive component 209 is connected to the driving lifting component 210. The driving lifting component 210 drives the adaptive component 209 to move up and down, and together drives the air volume adjusting block 208 to move up and down in the air duct. Since the amount of the cross-section of the air volume adjusting block 208 extending into the air duct changes, different cross-sectional areas of the air duct are formed at different positions of the air volume adjusting block 208 in the air duct, and finally the air resistance is adjusted according to the air pressure.

[0036] The driving module 212 is fixed on the side wall 206 of the housing and is used to provide the driving force for the rotation of the lead screw 211. The lead screw 211 is rotatably arranged on the support through bearings. The driving module 212 is connected to the lead screw 211, and the lead screw 211 is in threaded cooperation with the adaptive component 209. Then, the driving module 212 drives the lead screw 211 to rotate, and then drives the air regulating block 208 to move up and down through the adaptive component 209, changing the ventilation area of the drying hot air channel. Similarly, the up and down movement of the air regulating block is not limited to the form of lead screw drive, and a telescopic cylinder can be used to control the lifting.

[0037] The adaptive component 209 can deform slightly to adaptively adjust the up and down position of the air regulating block 208. The adaptive component 209 is made of an elastic material, such as a spring, or an elastic resistance member can also be used. When the air pressure in the air duct is too high, it can be compressed and move up, slightly adjusting the flow cross-section. When the pressure in the air duct decreases, it will return to its original state under the action of the elastic force, and the wind speed in the coarse particle selection air ring 201 can be kept floating within a very narrow range, and the air pressure and wind speed are basically stable, realizing precise control of the selected particle size.

[0038] A housing sealing component 213 for the up and down penetration of the adaptive component 209 is provided on the side wall 206 of the housing. The housing sealing component 213 is made of a flexible material, such as rubber. Since the adaptive component 209 needs to pass through the side wall 206 of the housing, the vertical seam on the side wall 206 of the housing is blocked by the housing sealing component 213, ensuring the airtightness inside the housing while ensuring the normal up and down movement of the adaptive component 209.

[0039] An air-facing inclined ring surface is provided on the inner side of the air regulating block 208, and a guiding inclined ring section parallel to the air-facing inclined ring surface is provided at the outlet of the second side wall 205. The hot air is guided through the air-facing inclined ring surface and the guiding inclined ring section, so that after the two hot air flows pass through the inner and outer air ducts, they have an inwardly inclined wind direction, which is beneficial to powder selection and drying.

[0040] The air regulating block 208 has a right triangle cross-section or a right trapezoid cross-section. The end surface where the hypotenuse of the air regulating block 208 is located is the air-facing inclined ring surface, that is, the right-angled ring surface opposite to the hypotenuse of the air regulating block 208 is attached to the side wall 206 of the housing. By extending the air-facing inclined ring surface of the air regulating block 208 to different positions in the air duct, a continuous gradual change of the flow cross-section is realized, ensuring stable and reliable adjustment. The maximum width of the air regulating block 208 is greater than the minimum width of the drying hot air channel 202, so that the air regulating block 208 can completely close the air duct.

[0041] Embodiment 2

[0042] Reference Figures 1 to 3As shown in the figure, a low-resistance vertical mill for treating high-moisture materials includes a powder separator 301, a grinding roller assembly 302, a grinding table assembly 303, a mill housing 304, and a column assembly 305. It also includes the low-resistance air ring for treating high-moisture materials in Embodiment 1, that is, it also includes an air ring assembly 306.

[0043] The mill housing 304 is used to form the internal space for abrasive operations and is also used for the installation and fixation of other components. The outer side of the mill housing 304 is supported by a column assembly 305 to ensure the stability of the mill housing 304 through the column assembly 305.

[0044] Inside the mill housing 304, there are a grinding roller assembly 302 and a grinding table assembly 303. The grinding roller assembly 302 is located on the grinding table assembly 303, and the two cooperate to grind the materials. Above the grinding roller assembly 302 in the upper part of the mill housing 304, there is a powder separator 301, which is used to screen the materials entering the inside of the housing.

[0045] The air ring assembly 306 is arranged on the outer circumference of the grinding table assembly 303, that is, the coarse particle separation air ring 201 is close to the grinding table side, and the drying hot air channel 202 is outside the coarse particle separation air ring and close to the housing side wall. The air ring assembly 306 divides the inside of the mill housing 304 into an outer discharge slag chamber 307 in the lower part and a main grinding and drying chamber 308 in the upper part.

[0046] During operation, hot air enters the mill from the air inlet of the outer discharge slag chamber 307. The hot air is divided into two streams by the air ring assembly 306 and enters the main grinding and drying chamber 308 respectively. During this period, the driving module 212 drives the lead screw 211 to rotate to control the up or down movement of the air regulating block 208, increasing or decreasing the ventilation area of the drying hot air channel 202, so as to achieve a large range of control of the air volume passing through the coarse particle separation air ring 201.

[0047] In actual operation, when the system fluctuates resulting in a change in air volume, or when the pressure loss of the adaptive low-resistance air ring fluctuates, the adaptive component 209 automatically floats up and down with the pressure fluctuation, adjusts the ventilation area of the drying hot air channel 202, stabilizes the air volume of the coarse particle separation air ring 201, keeps the wind speed of the coarse particle separation air ring 201 within the expected range, and at the same time achieves the lowest state of the pressure loss of the adaptive low-resistance air ring assembly 306. At the same time, the materials rolled by the grinding rollers are thrown out by the grinding table and enter the coarse particle separation air ring 201, where they are sorted by the upward airflow. Thanks to the stable wind speed of the coarse particle separation air ring 201, the control accuracy of the sorting particle size is greatly improved, the inefficient internal circulation volume in the mill is reduced, the grinding efficiency of the vertical mill is effectively improved, the large particles settle and are collected and discharged, and the rest are carried upward by the hot air and enter the subsequent process flow.

[0048] As described above, in this example, the adaptive low-resistance air ring assembly 306 can ensure that the coarse particle separation air ring 201 obtains the best and stable separation air velocity on the premise of the lowest pressure loss. The hot air flow direction during the whole process is basically consistent with the overall flow field inside the vertical mill, with little disturbance to the system. Under lower resistance conditions, the vertical mill realizes the grinding of high-moisture materials.

[0049] The basic example of the present application and its various further selected examples can be freely combined to form multiple embodiments, all of which are the embodiments that can be adopted and claimed in the present application. In the solution of the present application, each selected example can be arbitrarily combined with any basic example and selected example.

[0050] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A low-resistance air ring for treating high-moisture materials, comprising an air ring assembly (306), characterized in that: The described air ring assembly (306) is divided into a coarse particle separating air ring (201) on the inner layer and a drying hot air channel (202) on the outer layer. An adaptive air regulating mechanism (207) for adjusting the channel cross-section is provided at the outlet of the drying hot air channel (202). The adaptive air regulating mechanism (207) includes an air regulating block (208), an adaptive component (209), and a driving and lifting component (210). The air regulating block (208) is located inside the drying hot air channel (202). The inner end of the adaptive component (209) is connected to the air regulating block (208), and the outer end of the adaptive component (209) is connected to the driving and lifting component (210).

2. The low-resistance air ring for treating high-moisture materials according to claim 1, wherein: The described coarse particle separating air ring (201) includes a first side wall (203), a flow stabilizing plate (204), and a second side wall (205). A number of flow stabilizing plates (204) are provided between the first side wall (203) of the inner ring and the second side wall (205) of the middle ring.

3. The low-resistance air ring for treating high-moisture materials according to claim 1 or 2, wherein: The described drying hot air channel (202) includes the second side wall (205) of the middle ring and the housing side wall (206) of the outer ring.

4. The low-resistance air ring for treating high-moisture materials according to claim 3, wherein: A housing sealing component (213) for the adaptive component (209) to lift and pass through is provided on the housing side wall (206).

5. The low-resistance air ring for treating high-moisture materials according to claim 1, characterized in that: An air-facing inclined ring surface is provided inside the air regulating block (208), and a guiding air inclined ring section parallel to the air-facing inclined ring surface is provided at the outlet of the second side wall (205).

6. The low-resistance air ring for treating high-moisture materials according to claim 5, wherein: The air regulating block (208) has a right triangle cross-section or a right trapezoid cross-section, and the end face where the hypotenuse of the air regulating block (208) is located is the air-facing inclined ring surface.

7. The low-resistance air ring for treating high-moisture materials according to claim 1, characterized in that: The described adaptive component (209) is made of an elastic material.

8. The low-resistance air ring for treating high-moisture materials according to claim 1 or 7, characterized in that: The described driving and lifting component (210) includes a lead screw (211) and a driving module (212). The driving module (212) is connected to the lead screw (211), and the lead screw (211) is in threaded cooperation with the adaptive component (209).

9. A low-resistance vertical mill for disposing of high-moisture materials, comprising a mill housing (304), wherein a roller assembly (302) and a grinding table assembly (303) are arranged inside the mill housing (304), and characterized in that: It also includes a low-resistance air ring for treating high-moisture materials according to any one of claims 1 to 8. The air ring assembly (306) is provided on the outer periphery of the grinding table assembly (303). The air ring assembly (306) divides the interior of the mill housing (304) into an outer discharge slag chamber (307) at the lower part and a main grinding and drying chamber (308) at the upper part.

10. The low-resistance vertical mill for treating high-moisture materials according to claim 9, characterized in that: It also includes a separator (301) and a column assembly (305). A separator (301) is provided above the grinding roller assembly (302) at the upper part of the mill housing (304). The grinding roller assembly (302) is located on the grinding table assembly (303), and a column assembly (305) is supported on the outer side of the mill housing (304).

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