CN215507069U

CN215507069U - Vertical mill combined air guide device

Info

Publication number: CN215507069U
Application number: CN202122345394.2U
Authority: CN
Inventors: 柯柏青; 张德顺; 吴汇生; 沈科
Original assignee: Anhui Guohong Alloy Material Co ltd
Current assignee: Anhui Guohong Alloy Material Co ltd
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2022-01-14
Anticipated expiration: 2031-09-27

Abstract

The utility model discloses a combined air guide device of a vertical mill, which belongs to the technical field of vertical mills. The materials crushed by the grinding disc gradually overflow from the edge of the grinding disc, and are brought into the efficient powder selecting machine by high-speed upward hot air from the air guide device, so that the functions of scattering the materials, separating the materials and blowing the materials are achieved. According to the operation condition of the mill, the air guide cone plate in the upper air guide cone device is adjusted in time, so that the speed of hot air entering the vertical mill is uniform and stable, the internal resistance of the vertical mill is effectively reduced, and the power consumption of the system is reduced.

Description

Vertical mill combined air guide device

Technical Field

The utility model relates to the technical field of vertical roller mills, in particular to a vertical mill combined type air guide device.

Background

The vertical mill is a large-scale grinding device, is a high-efficiency energy-saving device integrating crushing, drying, grinding and grading conveying, and is widely applied to the industrial fields of cement, electric power, metallurgy, chemical industry and the like.

At present, in the production and grinding process of a vertical mill, continuous hot air flow needs to be introduced, and after the hot air flow passes through an air guide device, regular wind direction and uniform wind speed and wind pressure can be formed, and the hot air flow enters the middle part in the mill to dry and spray ground materials. The material particles with the diameter meeting the required size are upwards taken away by hot air flow from bottom to top and enter the powder concentrator for secondary coarse and fine powder separation. Therefore, reasonable wind speed and wind pressure are beneficial to stable airflow inside the mill, stable pressure inside the mill, smooth vibration of the mill, stable working condition inside the mill and stable thickness of the grinding disc material layer. These good operating mode for the grinding efficiency of mill promotes greatly, and mill output promotes by a wide margin, can also form good inside and outside material circulation to the mill.

However, if the air guide device in the vertical mill is not reasonably designed, the operation of the whole mill is directly influenced. The blowing ring in the air guide device is a group of inclined air guide plates which are uniformly distributed, and the blowing ring is annularly and equidistantly arranged. If the ring structure has poor strength, the ring structure is easy to wear and deform after being used for a long time, so that hot air entering the vertical mill has different air volume after passing through the deformed section, and the air speed is uneven. The wind speed is low, and the materials are not carried, so that the materials on the grinding disc are discharged outwards too much, and the cyclic load of the grinding machine is large. The air speed is higher, so that the materials are not discharged outside, more powder is accumulated on the grinding disc, a stable material layer cannot be formed, the load of a main motor of the grinding machine is increased, and the grinding disc vibrates.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a vertical mill combined type air guide device, which achieves the purposes of scattering materials, separating the materials and blowing the materials and can solve the problems in the prior art.

In order to achieve the purpose, the utility model provides the following technical scheme:

a vertical mill combined type air guide device comprises an upper air guide cone device and a lower blowing ring device, wherein the upper air guide cone device and the lower blowing ring device are connected through a connecting bolt;

the upper air guide cone device comprises an air guide cone plate, reinforcing rib plates and an upper connecting flange plate, the bottom end of the air guide cone plate is welded on the upper connecting flange plate, and the back of the air guide cone plate is welded with the connecting flange plate through the reinforcing rib plates which are distributed evenly;

the lower part jetting ring device comprises a lower connecting flange plate, an outer ring supporting arc plate, a supporting plate, a jetting ring plate, an upper wind shield and an inner ring supporting arc plate, wherein one end face of the lower connecting flange plate is welded with the outer ring supporting arc plate, the other end face of the lower connecting flange plate is welded with the supporting plate, the bottom end of the outer ring supporting arc plate is welded with the bottom end of the supporting plate, the lower connecting flange plate, the outer ring supporting arc plate and the supporting plate jointly form an outer ring supporting structure, the supporting plate and the inner ring supporting arc plate are fixedly welded through the jetting ring plate, and the upper wind shield is welded at the top end of the jetting ring plate.

Furthermore, the air guide conical plate, the outer ring support arc plate, the support plate and the inner ring support arc plate are all arc-shaped plate structures.

Furthermore, the upper connecting flange plate is provided with long waist-shaped bolt holes at equal intervals along the circumferential radial direction, the lower connecting flange plate is provided with threaded holes corresponding to the long waist-shaped bolt holes, and the connecting bolts penetrate through the long waist-shaped bolt holes and the threaded holes.

Furthermore, the included angle between the air guide conical plate and the vertical surface is 15-18 degrees.

Furthermore, the blowing annular plates are uniformly and obliquely arranged at intervals to form an air channel, and the horizontal included angle between the blowing annular plates and the ground is 45-70 degrees.

Furthermore, the thicknesses of the air guide conical plate, the upper connecting flange plate, the lower connecting flange plate, the supporting plate, the blowing ring plate and the inner ring supporting arc plate are all 20mm, the thickness of the reinforcing rib plate is 12mm, and the thickness of the outer ring supporting arc plate is 30 mm.

Compared with the prior art, the utility model has the following beneficial effects:

1. according to the combined air guide device of the vertical mill, the upper connecting flange plate of the upper air guide cone device is equidistantly provided with the long waist-shaped bolt holes along the circumferential radial direction, so that when the upper air guide cone device is connected with the lower blowing ring device, the upper air guide cone device can move back and forth between the vertical mill shell and the grinding disc, the size of an air outlet section is adjusted, and the air speed is adjusted.

2. According to the vertical mill combined type air guide device, the inner ring supporting arc plate is additionally arranged in the lower blowing ring device, so that the overall strength is increased, the stability is better, and the vertical mill combined type air guide device is not easy to deform in production and use;

3. the combined air guide device of the vertical mill has the advantages that the air guide conical plate and the blowing annular plate are both made of composite alloy wear-resistant steel plates, the strength and the wear resistance are high, the surface with the wear-resistant layer faces hot air and materials, and the service life of parts is effectively prolonged.

4. The combined air guide device of the vertical mill selects reasonable angles of the blowing annular plate and the air guide conical plate through design calculation, so that the speed of hot air entering the vertical mill is uniform and stable, the internal resistance of the vertical mill is effectively reduced, and the power consumption of a system is reduced.

Drawings

Fig. 1 is a sectional view of the novel vertical mill combined air guide device;

fig. 2 is an assembly view of the novel vertical mill combined type air guide device;

fig. 3 is a schematic structural view of an upper air guiding cone device of the novel vertical mill combined type air guiding device;

fig. 4 is a schematic structural view of a lower blowing ring device of the novel vertical mill combined air guide device.

In the figure: 1. an air guide conical plate; 11. an air guide conical plate; 12. reinforcing rib plates; 13. an upper connecting flange plate; 131. a long waist bolt hole; 2. a lower blowing ring device; 21. a lower connecting flange plate; 211. a threaded hole; 22. the outer ring supports the arc plate; 23. a support plate; 24. a blowing ring plate; 25. an upper wind deflector; 26. the inner ring supports the arc plate; 3. and connecting the bolts.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, the combined air guide device for the vertical mill comprises an upper air guide cone device 1 and a lower blowing ring device 2, wherein the upper air guide cone device 1 and the lower blowing ring device 2 are connected through a connecting bolt 3, so that the connection stability of the upper air guide cone device 1 and the lower blowing ring device 2 is maintained, the disassembly and the replacement are convenient, and the field maintenance and the management are easy.

Referring to fig. 2-3, the upper wind guiding cone device 1 comprises a wind guiding cone plate 11, a reinforcing rib plate 12 and an upper connecting flange plate 13, the bottom end of the wind guiding cone plate 11 is welded on the upper connecting flange plate 13, when the wind guiding cone plate 11 is welded with the upper connecting flange plate 13, the included angle between the wind guiding cone plate 11 and a vertical plane is ensured to be 15-18 degrees, calculation and selection are performed according to vertical grinding of different models, the wind guiding cone plate 11 is a composite alloy wear-resistant steel plate with the thickness of 20mm, the composite plate is arranged on the surface of a Q345 steel plate with the thickness of 12mm, through a surfacing process, a wear-resistant alloy welding wire is used for surfacing a wear-resistant layer with the thickness of 8mm, the wear-resistant layer faces hot air flow and can resist the scouring of sweeping materials, the composite plate has high strength, can withstand the impact of high-speed air flow and materials, has long service life, the upper connecting flange plate 13 is formed by blanking steel plates with the material quality of Q345 and the thickness of 20mm, the back of the air guide conical plate 11 is welded with the upper connecting flange plate 13 through reinforcing rib plates 12 which are distributed evenly, so that the whole structure is firmer and more reliable, and the reinforcing rib plates 12 are formed by blanking steel plates which are made of Q345 and have the thickness of 12 mm.

Referring to fig. 2 and 4, the lower blowing ring device 2 includes a lower connecting flange plate 21, an outer ring supporting arc plate 22, a supporting plate 23, a blowing ring plate 24, an upper wind shield 25 and an inner ring supporting arc plate 26, one end surface of the lower connecting flange plate 21 is welded to the outer ring supporting arc plate 22, the other end surface of the lower connecting flange plate 21 is welded to the supporting plate 23, the outer ring supporting arc plate 22 is formed by blanking a Q345 steel plate with a thickness of 30mm, the bottom end of the outer ring supporting arc plate 22 is welded to the bottom end of the supporting plate 23, the supporting plate 23 is made of an NM500 wear-resistant steel plate with a thickness of 20mm, the lower connecting flange plate 21, the outer ring supporting arc plate 22 and the supporting plate 23 jointly form an outer ring supporting structure, the supporting plate 23 and the inner ring supporting arc plate 26 are welded and fixed by the blowing ring plate 24, the inner ring supporting arc plate 26 is a Q345 steel plate with a thickness of 20mm, the upper wind shield 25 is welded to the top end of the blowing ring plate 24, and the size of the blowing ring plate 24 is determined according to the size of the vertical mill, the blowing ring plates 24 are evenly and obliquely arranged at intervals to form a ventilation channel, the included angle between the blowing ring plates and the ground is 45-70 degrees, different angles are calculated and selected according to different vertical mills, the thickness of the blowing ring plates 24 is also 20mm, the wear-resistant layer of the composite alloy wear-resistant steel plate faces hot air blowing, the upper wind shield 25 is used for adjusting the size of an air outlet section, and the blowing wind speed is adjusted according to the grinding condition.

The air guide conical plate 11, the outer ring support arc plate 22, the support plate 23 and the inner ring support arc plate 26 are all arc-shaped plate structures and are arranged into arc-shaped structures, and a plurality of air guide devices can be conveniently spliced into a circular air guide device.

The upper connecting flange plate 13 is provided with long waist-shaped bolt holes 131 at equal intervals along the circumferential radial direction, the lower connecting flange plate 21 is provided with threaded holes 211 corresponding to the long waist-shaped bolt holes 131 in position, the connecting bolts 3 penetrate through the long waist-shaped bolt holes 131 and the threaded holes 211, the connecting bolts 3 are connected with the upper connecting flange plate 13 and the lower connecting flange plate 21 through the long waist-shaped bolt holes 131 and the threaded holes 211, connection and fixation of the upper air guide cone device 1 and the lower blowing ring device 2 are further achieved, the long waist-shaped bolt holes 131 are arranged for adjusting the installation position of the upper air guide cone device 1, and therefore the wind speed of hot air flow passing through the outlet section is guaranteed.

The working process of the device is as follows:

the small components of the air guide device are connected front and back to form a circle of circular air guide device, the circular air guide device is installed at the middle position of a vertical mill shell (the position A in figure 1) and a vertical mill millstone (the position B in figure 1), the size of the distance between an inner ring supporting arc plate 26 and the outer diameter of the vertical mill millstone is 20mm, and the height H between an upper air baffle 25 and a material retaining ring of the vertical mill millstone is determined according to the grinding condition. The one-grid ventilation duct partitioned by the blowing ring plate 24 is a cross-sectional passage through which hot air flows (the arrow direction at the lower part of fig. 1 is the hot air flow inlet direction, the arrow direction of fig. 2 is the hot air flow inlet direction, and the arrow direction at the upper part of fig. 1 is the hot air flow outlet direction). When the vertical mill runs, hot air flow enters from the air inlet from bottom to top, because the jetting annular plates 24 are obliquely arranged at intervals, when the hot air flow passes through a grid-grid air channel formed by the partitioning of the jetting annular plates 24, a stream of uniform air in a rotational flow direction is naturally formed, powder overflowing from the grinding disc falls onto the jetting annular plates 24, a primary scattering process is firstly carried out, the powder with larger particle diameter directly falls into the material discharging bin, the powder with the particle diameter meeting the size requirement is blown by the uniform air above the rotational flow, the cross section of the air outlet is further adjusted by matching with the air guide conical plate 11, and the formed high-speed air directly drives the powder to enter the upper powder concentrator for secondary coarse-fine powder separation; if in production, the wind speed is not enough in the vertical mill, and the powder cannot be brought into the upper powder concentrator by the wind, so that the powder is collapsed and other adverse working conditions are caused, the connecting bolt 3 can be loosened when the vertical mill is stopped, and the adjustment is carried out by means of the long waist-shaped bolt hole 131, so that the upper air guide cone device 1 moves towards the direction of the grinding disc, the ventilation section is further reduced, and the wind speed is increased to a reasonable value. On the contrary, if the air speed in the mill is too high, and unqualified products such as coarse powder and the like are blown and taken away to enter the powder concentrator, the air speed passing through the air guide device is too high, at the moment, the connecting bolt 3 can still be loosened when the vertical mill is stopped, and the adjustment is carried out by virtue of the long-waist-shaped bolt hole 131, so that the upper air guide cone device 1 moves towards the outer direction of the shell of the mill, the ventilation section is further enlarged, and the air speed is reduced to a reasonable value. In the process, the novel vertical mill combined type air guide device achieves the effects of scattering, separating and blowing materials, and also achieves the purposes of adjusting the ventilation section and the ventilation angle and adjusting the air speed according to the working conditions of the vertical mill, such as the size of the circulating load, the change of the material layer of the vertical mill, the qualification rate of finished products and the like.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A vertical mill combined type air guide device is characterized by comprising an upper air guide cone device (1) and a lower blowing ring device (2), wherein the upper air guide cone device (1) and the lower blowing ring device (2) are connected through a connecting bolt (3);

the upper air guide cone device (1) comprises an air guide cone plate (11), reinforcing rib plates (12) and an upper connecting flange plate (13), the bottom end of the air guide cone plate (11) is welded on the upper connecting flange plate (13), and the back of the air guide cone plate (11) is welded with the connecting flange plate (13) through the reinforcing rib plates (12) which are distributed evenly;

lower part jetting ring device (2) support arc board (22), backup pad (23), jetting crown plate (24), upper portion deep bead (25) and inner circle including lower flange board (21), outer lane and support arc board (26), the terminal surface and the outer lane of lower flange board (21) support arc board (22) welding, another terminal surface and backup pad (23) welding of lower flange board (21), the bottom of outer lane support arc board (22) and the bottom welding of backup pad (23), lower flange board (21), outer lane support arc board (22), backup pad (23) constitute outer lane bearing structure jointly, support between arc board (26) through jetting crown plate (24) welded fastening between backup pad (23) and the inner circle, the top welding upper portion deep bead (25) of jetting crown plate (24).

2. A combined air ducting device as claimed in claim 1, wherein the air guiding cone plate (11), the outer ring supporting arc plate (22), the supporting plate (23) and the inner ring supporting arc plate (26) are all arc-shaped plate structures.

3. A combined type wind guiding device of a vertical mill according to claim 1, characterized in that the upper connecting flange plate (13) is provided with long waist bolt holes (131) at equal intervals along the circumferential radial direction, the lower connecting flange plate (21) is provided with threaded holes (211) corresponding to the long waist bolt holes (131), and the connecting bolts (3) penetrate through the long waist bolt holes (131) and the threaded holes (211).

4. A combined air ducting device as claimed in claim 1, wherein the angle between the air guiding cone plate (11) and the vertical plane is 15 ° -18 °.

5. A combined air ducting device as claimed in claim 1, wherein the blowing ring plates (24) are arranged at regular intervals and in an inclined manner to form an air duct, and the included angle between the blowing ring plates and the ground is 45 ° to 70 °.

6. The combined air guide device of the vertical mill according to claim 1, wherein the thicknesses of the air guide conical plate (11), the upper connecting flange plate (13), the lower connecting flange plate (21), the support plate (23), the blowing ring plate (24) and the inner ring support arc plate (26) are all 20mm, the thickness of the reinforcing rib plate (12) is 12mm, and the thickness of the outer ring support arc plate (22) is 30 mm.