Double-rotor series powder concentrator

Abstract

The utility model relates to the field of powder separation equipment, in particular to a double-rotor series powder concentrator, which is characterized in that the double-rotor powder concentrator is connected in series in a shell and is respectively connected with an upper driving device and a lower driving device outside the shell, and the upper rotor and the lower rotor can be respectively adjusted by the driving devices. Meanwhile, due to the fact that the upper rotor and the lower rotor are arranged, after the upper rotor screens the coarse powder once, the lower rotor can screen the coarse powder again, the screened fine powder is fed into the upper rotor again for secondary screening, the mixing probability of the fine powder and the coarse powder is reduced, and the powder selecting efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of powder sorting equipment, in particular to a double-rotor series powder sorting machine. Background Art

[0002] Powder classifiers are widely used in the grading process of powder in the cement industry. The powder classifier can classify the materials crushed by the mill and separate the fine powder and coarse powder that meet the particle size requirements, thereby controlling the particle size distribution of cement. The particle size distribution of cement has a significant impact on the hydration rate, strength development and other properties of cement. At the same time, the powder classifier also helps to reduce dust emissions and improve the working environment during the screening process, meeting environmental protection requirements.

[0003] In the powder screening process of cement industry, powder materials are first ground and then screened. Therefore, in the actual sorting process of the powder entering the powder classifier, some fine powder cannot pass through the screening and fall into the coarse powder due to mutual adhesion, agglomeration, interference and other reasons. The ratio of the total amount of fine powder selected by the powder classifier to the total amount of fine powder in the powder classifier feed is called the powder selection efficiency.

[0004] At present, most of the commonly used powder classifiers are single-rotor structures. The powder selection efficiency of such powder classifiers is limited. Therefore, on the basis of the single-rotor powder classifier, it is gradually changed to a double-rotor or multi-rotor powder classifier. For example, patent CN 110773428 discloses a powder classifier structure, in which at least two rotors are arranged in parallel, and the cage-type rotors rotate in opposite directions. Airflow is generated during the rotation of the rotors, and an airflow vortex is formed in conjunction with the lower air inlet to classify the powder. At present, most of the double-rotor or multi-rotor powder classifiers on the market are similar to the powder classifier structure disclosed in patent CN 110773428. Multiple rotors are arranged in parallel, and the gap between the blades on the rotors is used to screen fine powder. However, the rotors arranged in this way need to be controlled by multiple motors, which will increase the energy consumption in the production process. At the same time, although such an arrangement can ensure the stability of the airflow, thereby ensuring the stability of the powder selection structure, since only one screening can be performed, the effect of improving the powder selection efficiency is very small.

[0005] In summary, in order to improve the powder selection efficiency of the powder classifier, the market needs a device that can perform multi-stage sorting of powder materials to avoid the influence of fine powder adhesion and other problems on the powder selection efficiency, and to avoid a large amount of fine powder from flowing into the grinding system again, causing ineffective work of the mill and energy waste. Utility Model Content

[0006] In order to solve the problems mentioned in the background technology and overcome the above shortcomings, the utility model provides the following technical solutions:

[0007] A double-rotor series powder separator has a shell on the outside and two rotors connected in series up and down are arranged in the shell.

[0008] The top of the shell is an upper driving device, and the lower driving device is arranged outside the lower part of the shell. In addition, the shell is respectively provided with an air outlet, two side air inlets, a coarse powder return port and a lower air inlet from top to bottom. The bottom of the shell is also welded with a side air inlet volute, and the side near-wind volute and the lower part of the shell form a separate internal space;

[0009] Furthermore, the upper rotor and the lower rotor are coaxially arranged in series, and the upper and lower rotor parts are arranged inside the shell; the two side air inlets are respectively welded at symmetrical positions on the shell, and the shell is divided into upper and lower parts according to the positions of the side air inlets; the upper rotor is arranged inside the shell above the side air inlet, and the lower rotor is located at the bottom of the shell.

[0010] The upper driving device is connected to the upper rotor in the housing and drives the upper rotor to rotate;

[0011] Furthermore, the upper rotor is truncated into a cylindrical shape; a plurality of moving blades are arranged around the rotor, the moving blades have a rectangular cross-section, the moving blades have a width of 50-100 mm, and the moving blades are inclined 15-20 degrees in the vertical direction;

[0012] In addition to the moving blades, the upper rotor is also provided with a stationary blade group on the outer ring of the moving blades; the stationary blade group is composed of a plurality of stationary blades;

[0013] Furthermore, the stationary blade is a rectangular composite wear-resistant plate, the transverse width of the stationary blade is 100-200 mm, and the spacing between two adjacent stationary blades is 15-60 mm;

[0014] A pin is installed at the bottom of the stationary blade to adjust the rotation angle of the stationary blade in the vertical direction and ensure the gap wind speed between the stationary blades during operation;

[0015] Furthermore, the pin is installed at a distance of 40 mm from the inner side of the stationary blade, and the distance between the pin and the outer ring of the rotor is 150-200 mm; the angle between the line connecting the rotation point of the stationary blade and the center of the rotor and the stationary blade when viewed from above is 60°-80°;

[0016] Furthermore, when the rotor is running, the linear speed of the outermost circle is 16-40 m / s; the wind speed when the wind enters the gap between the stationary blades is 12-20 m / s;

[0017] An upper material discharge cone is arranged directly below the upper rotor. The upper material discharge cone is fixedly welded inside the shell, and the lower rotor is located below the upper material discharge cone.

[0018] The lower driving device arranged outside the shell is connected to and drives the lower rotor to rotate. The lower rotor is provided with moving blades on the outside, and its outer ring is provided with a lower static blade group arranged evenly. The lower static blade group is the same as the outer part of the upper rotor. The lower static blade group is composed of a plurality of static blades, and the static blades are also rectangular composite wear-resistant plates. The static blades are arranged on the outer ring of the lower rotor in the same manner as the outer ring of the upper rotor. The angle between the rotation point of the static blade and the center of the rotor is adjusted by a pin shaft to meet the wind speed requirement of the gap between the static blades to ensure that the wind enters during the operation of the lower rotor.

[0019] Furthermore, a material spreading plate is arranged at an upper position near the center of the lower rotor; 4 to 6 volute material spreading pipes are arranged around the material spreading plate; a lower material discharge cone is arranged directly below the lower rotor, and the upper edge of the lower material discharge cone is welded to the lower edge of the side air inlet volute casing to form a closed space, and the lower rotor is located in the space.

[0020] In the actual production process, the powder mixed airflow enters the equipment from the lower air inlet below the shell. When the powder enters the area between the upper static blade group and the upper rotor, the fine powder passes through the upper rotor with the airflow and enters the inner side of the rotor. This part is the finished fine powder obtained by separation. The obtained finished fine powder flows out from the upper air outlet into the finished product warehouse.

[0021] The primary coarse powder that has not passed through the upper rotor is beaten out by the upper rotor, blocked by the upper static blade group, and falls into the upper discharge cone. It flows from the upper discharge cone to the scattering plate on the top of the lower rotor, and is thrown out through the volute scattering pipe on the scattering plate by centrifugal force, and then falls between the lower rotor and the lower static blade group; the airflow entering from the side air inlet is mixed with the falling primary coarse powder, and the fine powder mixed in the primary coarse powder enters the lower rotor with the airflow from the side air inlet, and then rises to the upper rotor again for sorting, and the finished fine powder flows out from the upper air outlet;

[0022] The first-stage coarse powder beaten out by the lower rotor is stopped by the lower static blade group and falls into the lower discharge cone. This part of the coarse powder eventually flows out from the coarse powder return port and returns to the grinding system for further grinding. After grinding, it enters the equipment again from the lower air inlet and is screened, and the process repeats.

[0023] Compared with the prior art, the beneficial effects of the utility model are:

[0024] 1. The present application screens the powder by setting up two rotors connected in series, and connecting the upper and lower rotors to separate driving devices respectively. The rotation speeds of the upper rotor and the lower rotor can be adjusted according to actual production needs, thereby controlling the fineness of the finished fine powder, which is more suitable for actual production needs and greatly improves the powder selection rate.

[0025] 2. The primary coarse powder separated by the upper rotor will fall to the outside of the lower rotor for secondary separation, and a part of the fine powder will be screened out and re-enter the upper rotor for further separation. This part of the fine powder will not be mixed with the coarse powder and flow back to the system, and will be re-grinded, which reduces the proportion of fine powder in the circulating material in the grinding system and greatly improves the powder selection efficiency.

[0026] 3. The screened coarse powder flows out through the set coarse powder return port and returns to the grinding system. After mixing and grinding, it re-enters the powder selector for screening again, which is convenient for the collection and utilization of coarse materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is an external schematic diagram of the double-rotor series powder separator of the utility model;

[0028] Figure 2 This is a schematic diagram of the housing channel of the utility model;

[0029] Figure 3 It is a schematic diagram of the internal structure of the main body of the utility model;

[0030] Figure 4 It is a top view of the lower part of the utility model;

[0031] Figure 5 This is an overall schematic diagram of the lower rotor of the utility model;

[0032] Figure 6 It is an overall cross-sectional view of the lower part of the utility model;

[0033] Figure 7 This is a schematic diagram of the dimensions of the stationary blades of the utility model;

[0034] 1-housing, 11-lower air inlet, 12-side air inlet, 13-air outlet, 14-coarse powder return port, 15-side near-wind volute, 2-upper driving device, 3-lower driving device, 4-upper rotor, 5-upper static blade group, 6-upper discharge cone, 7-lower rotor, 71-moving blades, 72-spreading disc, 73-volute spreading pipe, 8-lower static blade group, 9-lower discharge cone. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0037] Example 1

[0038] like Figure 1 As shown, the exterior of the dual-rotor series powder concentrator is a shell 1, an upper driving device 2 is provided on the top of the shell 1, and a lower driving device 3 is provided on the outer side of the bottom of the shell 1.

[0039] like Figure 2 As shown, the exterior of the shell 1 is provided with a lower air inlet 11, a coarse powder return port 14, two symmetrical side air inlets 12, and an air outlet 13 from bottom to top. The shell 1 is divided into an upper and lower part by the two symmetrical side air inlets 12 as a boundary, and the dual rotors connected in series are respectively arranged in the upper and lower parts of the shell 1.

[0040] like Figure 3 As shown, it is a schematic diagram of the internal structure of the powder classifier of the present application, the upper rotor 4 and the lower rotor 7 are coaxially arranged in series, and the upper and lower rotors are arranged inside the housing 1;

[0041] As shown in the figure, the upper driving device 2 is connected to the upper rotor 4 to drive the upper rotor 4 to rotate. The outer ring of the upper rotor 4 is an upper stationary blade group 5, which is composed of a plurality of stationary blades. The stationary blades are rectangular composite wear-resistant plates with a transverse width of 100 mm. The spacing between two adjacent stationary blades in the stationary blade group 5 is 25 mm.

[0042] like Figure 7 The figure shows a schematic diagram of the size and distance of the stationary blades, where a is the width of the stationary blade, which is 100 mm, and c is the distance between two stationary blades, which is 25 mm.

[0043] A pin is installed at the bottom of the stationary blade, which can adjust the rotation angle of the stationary blade in the vertical direction and ensure the gap wind speed between the stationary blades during operation; the pin is installed at 40mm from the inner side of the stationary blade, and the distance d between the pin and the outer ring of the rotor is 150mm; the stationary blade can be regarded as a line segment when viewed from above, and the angle b between the line connecting the stationary blade rotation point and the rotor center and the line segment is 60°;

[0044] like Figure 3 As shown, an upper material discharge cone 6 is arranged directly below the upper rotor 4, and the upper material discharge cone 6 is fixedly welded inside the housing 1; below the upper material discharge cone 6 is the lower rotor 7;

[0045] The outer periphery of the lower rotor 7 is a lower stationary blade group 8, which has the same structure as the upper stationary blade group 5 on the outer ring of the upper rotor 4; the lower rotor 7 is connected to a lower driving device 3 arranged outside the housing 1 to drive the lower rotor 7 to operate;

[0046] like Figure 4The figure shows a top view of the lower part, in which the housing 1 is divided into two parts, the upper and lower parts, with the side air inlet 12 as the boundary. The lower rotor 7 and its inner ring moving blades 71 and the lower stationary blade group 8 are all located in the lower area of ​​the housing 1.

[0047] like Figure 5 As shown, a material spreading plate 72 is arranged at the upper center of the lower rotor 7; and four volute material spreading pipes 73 are arranged around the material spreading plate 72.

[0048] like Figure 6 As shown, a lower discharge cone 9 is provided directly below the lower rotor 7, and the lower discharge cone 9 is fixedly welded inside the shell 1; a side air inlet volute 15 is also provided outside the lower stationary blade group 8 to ensure the gap wind speed of the wind entering the stationary blade group 8; the upper edge of the lower discharge cone 9 is welded to the lower edge of the side air inlet volute 15 to form a closed space.

[0049] Example 2

[0050] The original output of a roller press final grinding cement grinding station is 100t / h, and the finished product ratio is 3400cm 2 / g, the roller press specifications are 1.4×1.4 meters, and the feed rate is about 600t / h;

[0051] If a traditional single-rotor powder classifier is used, the single-rotor powder classifier is a single-rotor 3.3-meter dynamic powder classifier + a V-type static powder classifier, and the system circulation air volume is set to 240,000-260,000m 3 / h; When the powder enters the equipment, the single rotor runs to separate the fine powder from the coarse powder, and the finished fine powder is collected.

[0052] If the double-rotor series powder concentrator of the present application is used, the upper rotor 4 of the double-rotor series powder concentrator is 3.3 meters, the lower rotor 7 is 2 meters, and the system circulation air volume is 180000~200000m 3 / h, two side air inlets 12, air volume about 80000~90000m 3 / h; when the powder mixed airflow enters the equipment from the lower air inlet 11 below the shell 1, when the powder enters the area between the upper stationary blade group 5 and the upper rotor 4, the fine powder passes through the upper rotor 4 with the airflow and enters the inner side of the rotor. This part is the finished fine powder obtained by separation. The obtained finished fine powder flows out from the upper air outlet 13 and enters the finished product warehouse; the primary coarse powder that does not pass through the upper rotor 4 is beaten out by the upper rotor 4, blocked by the upper stationary blade group 5, falls into the upper discharge cone 6, and flows from the upper discharge cone 6 to the scattering plate 72 on the top of the lower rotor 7, and is spread on the scattering plate 72 by centrifugal force through the volute scattering pipe 73 The first-stage coarse powder is thrown out and then falls between the lower rotor 7 and the lower stationary blade group 8; the airflow entering from the side air inlet 12 is mixed with the fallen first-stage coarse powder, and the fine powder mixed in the first-stage coarse powder enters the lower rotor 7 with the airflow from the side air inlet 12, and then rises to the upper rotor 4 again for sorting, and the finished fine powder flows out from the upper air outlet 13; the first-stage coarse powder beaten by the lower rotor 7 is stopped by the lower stationary blade group 8 and falls into the lower discharge cone 9, and this part of the coarse powder finally flows out from the coarse powder return port 14 and returns to the grinding system for further grinding, and after grinding, it enters the equipment again from the lower air inlet 11, and is screened, and the process repeats.

[0053] For the above single rotor powder concentrator and double rotor series powder concentrator, feed them separately with the feeding rate of 600t / h and control the finished product ratio at 3400cm 2 / g; Through comparison, it is found that the output of the double-rotor series powder classifier increases to 115-120t / h compared with the single-rotor powder classifier, indicating that the system circulation load is reduced, the powder selection efficiency is increased, and it is more suitable for production.

[0054] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A double-rotor series powder separator, wherein a driving device and an air inlet are arranged outside the housing (1), and a rotor and a blade assembly are arranged inside the housing (1), characterized in that: The shell (1) is divided into an upper and lower part by two side air inlets (12); an upper rotor (4) is provided in the upper part of the shell (1), and a lower rotor (7) is provided in the lower part of the shell (1); the upper rotor (4) and the lower rotor (7) are arranged in series and are respectively connected to a driving device.

2. A double-rotor series powder separator as claimed in claim 1, characterized in that: The outer sides of the upper rotor (4) and the lower rotor (7) are respectively provided with a circle of moving blades (71), and the outer circles of the moving blades (71) are also respectively provided with an upper stationary blade group (5) and a lower stationary blade group (8).

3. A double-rotor series powder concentrator as claimed in claim 2, characterized in that: The upper static blade group (5) and the lower static blade group (8) are composed of a plurality of static blades, each of which is a rectangular composite wear-resistant plate, and the lateral width of the static blade is 100-200 mm; the spacing between two adjacent static blades is 15-60 mm.

4. A double-rotor series powder concentrator as claimed in claim 3, characterized in that: A pin is provided at the bottom of the stationary blade, which is installed 40 mm away from the inner side of the stationary blade. The distance between the pin and the outer ring of the rotor is 150-200 mm; the angle between the line connecting the rotation point of the stationary blade and the center of the rotor and the stationary blade when viewed from above is 60°-80°.

5. A double-rotor series powder concentrator as claimed in claim 2, characterized in that: The moving blade (71) has a rectangular cross section, a width of 50-100 mm, and an inclination of 15°-20° in the vertical direction.

6. A double-rotor series powder concentrator as claimed in claim 1, characterized in that: Below the upper rotor (4) in the housing (1) is an upper material discharge cone (6), and below the upper material discharge cone (6) is the lower rotor (7).

7. A double-rotor series powder concentrator as claimed in claim 1, characterized in that: A material spreading disc (72) is arranged at the upper center of the lower rotor (7), and a volute material spreading pipe (73) is arranged around the material spreading disc (72); a lower material discharge cone (9) is arranged below the lower rotor (7).

8. A double-rotor series powder concentrator as claimed in claim 7, characterized in that: The number of the volute-shaped material spreading pipes (73) is 4 to 6.

9. A double-rotor series powder concentrator as claimed in claim 7, characterized in that: The upper edge of the lower discharge cone (9) and the lower edge of the side air inlet volute (15) are welded to form a closed space, and the lower rotor (7) is located in the closed space.

10. A double-rotor series powder concentrator as claimed in claim 1, characterized in that: The driving device is divided into an upper driving device (2) and a lower driving device (3); the upper driving device (2) is arranged at the top of the outer side of the shell (1) and is connected to the upper rotor (4); the lower driving device (3) is arranged outside the shell (1) and is connected to the lower rotor (7).

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