Efficient rotary separator

Abstract

The utility model belongs to the field of coal mill pulverizing systems, and provides an efficient rotary separator which comprises a shell, a driving motor, a rotating assembly and an expansion type distribution box. The driving motor is positioned above the expansion type distribution box and is used for providing power; the rotating assembly is located in the middle of the shell and used for separating pulverized coal, and the driving motor is connected with the rotating assembly; the expansion type distribution box is located above the shell and used for distributing and discharging the pulverized coal separated out by the rotating assembly. The expansion type distribution box comprises an inner cone and an outer cone, the inner cone and the outer cone are in an inverted cone shape, an annular area for air powder flow to pass through is formed between the inner cone and the outer cone, and the horizontal section area of the annular area is gradually increased from bottom to top. According to the expansion type distribution box, the inner inverted cone structure and the outer inverted cone structure are adopted, the inner cone can effectively protect the hollow shaft from being blown and damaged by pulverized coal, the equipment safety is improved, and the air volume deviation and the component deviation of the multiple pulverized coal outlets are reduced.

Description

Technical Field

[0001] The utility model belongs to the field of coal pulverizing system, and in particular relates to a high-efficiency rotary separator. Background Art

[0002] Conventional rotary separators are generally structured with a combination of dynamic and static blades, where the wind and powder flow first flows through the static shutters and then enters the cage area for diversion. Some rotary separators are also belt-driven.

[0003] The existing technology has the following defects and deficiencies: the static shutter increases the system resistance and occupies the internal space of the separator, and a powder return cone needs to be added to the lower part of the static shutter to prevent the wind and powder flow from short-circuiting. The dynamic and static combined blades increase the power field resistance of the powder making system and occupy a large space, which brings many difficulties to the investment and construction of the plant and daily maintenance. The hollow shaft in the middle of the conventional rotary separator is easily damaged.

[0004] The belt drive structure will generate radial force during operation, which is prone to slippage and loss of rotation, and requires frequent tension adjustment; belt drives usually use two-disc support bearings to ensure operational stability, and the inspection and replacement of bearings requires a lot of manpower. Fewer and fewer production units use belt drive dynamic separators Utility Model Content

[0005] The utility model provides a high-efficiency rotary separator, which solves the problem that the central axis of a conventional rotary separator is easily damaged.

[0006] To achieve the above objectives, this application provides the following technical solutions:

[0007] A high-efficiency rotary separator comprises: a shell, a driving motor, a rotating assembly and an expandable distribution box; the driving motor is located above the expandable distribution box for providing power; the rotating assembly is located in the middle of the shell for separating coal powder, and the rotating assembly is connected to the driving motor; the expandable distribution box is located above the shell for distributing and discharging the coal powder separated by the rotating assembly, the expandable distribution box comprises an inner cone and an outer cone, the inner cone and the outer cone are in an inverted cone shape, and an annular area is formed between the inner cone and the outer cone for allowing air and powder flow to pass through; the horizontal cross-sectional area of ​​the annular area gradually increases from bottom to top.

[0008] Furthermore, in the high-efficiency rotary separator as described above, the inner cone is sleeved on the outside of the middle section of the hollow shaft of the rotating component; the top of the inner cone is connected to the top of the expansion-type distribution box, and the bottom end of the inner cone is higher than the bottom end of the outer cone; the bottom end of the inner cone is provided with a downwardly extending sleeve, and the sleeve is sleeved on the outside of the middle section of the hollow shaft of the rotating component, and there is a gap between the sleeve and the hollow shaft for sealing air to pass through.

[0009] Furthermore, in the high-efficiency rotary separator as described above, a transmission gearbox is arranged between the drive motor and the expandable distribution box for transmitting power; a slewing bearing is arranged between the transmission gearbox and the rotating assembly for supporting the rotating assembly, and the drive motor is connected to the transmission gearbox.

[0010] Furthermore, in the high-efficiency rotary separator as described above, the rotating assembly includes the hollow shaft and the rotating cage, the hollow shaft is screwed and fixed to the outer ring of the slewing bearing, the hollow shaft and the rotating cage are connected by bolts, and the outer ring of the slewing bearing is meshed with the transmission gear box.

[0011] Furthermore, in the high-efficiency rotating separator as described above, the rotating cage is in an inverted cone structure, and the horizontal cross-sectional area of ​​the inverted cone structure gradually increases from bottom to top; the rotating cage is provided with blades for separating coal powder; a first angle is set between the blades and the horizontal plane; a second angle is set between the blades and the vertical plane; and a plurality of the blades are evenly arranged along the circumference of the side surface of the inverted cone structure.

[0012] Furthermore, in the high-efficiency rotary separator as described above, a sealing blade is provided at the top of the rotating cage. The sealing blade is a rectangular steel plate fixed above the supporting ring of the rotating cage. There is a certain gap between the sealing blade and the top plate of the shell, and the angle between the sealing blade and the horizontal plane is the same as the angle between the blade and the horizontal plane.

[0013] Furthermore, in the above-mentioned high-efficiency rotary separator, an air sealing ring is provided between the top end of the expansion type distribution box and the transmission gear box, so as to ensure that the sealing air pressure is greater than the internal pressure of the high-efficiency rotary separator.

[0014] Furthermore, in the high-efficiency rotary separator as described above, the hollow shaft is sleeved on the outside of the central coal dropping pipe, and the central coal dropping pipe is used to convey coal powder; wind shielding rings are respectively arranged between the central coal dropping pipe and the hollow shaft and between the hollow shaft and the transmission gear box to keep the sealing air pressure greater than the internal pressure of the high-efficiency rotary separator; the central coal dropping pipe is sleeved on the outside of the coal conveying steel pipe.

[0015] Furthermore, in the above-mentioned high-efficiency rotary separator, a sealing pressure plate is provided between the central coal dropping pipe and the coal conveying steel pipe, and the vertical cross-section of the sealing pressure plate is in a transverse L-shape; a sealing filler is provided below the sealing pressure plate.

[0016] Furthermore, in the high-efficiency rotary separator as described above, a powder outlet is provided at the top of the expansion type distribution box for outputting qualified coal powder; and an inspection door is provided on the side of the shell for inspection and repair.

[0017] The technical solution provided by the embodiment of the present application has the following beneficial effects:

[0018] The expanded distribution box of the present application adopts two inverted cone structures inside and outside. The inner cone can effectively protect the hollow shaft from coal powder blowing damage, improve equipment safety, and reduce the air volume deviation and component deviation of multiple powder outlets; the present application adopts a single slewing bearing with a stable structure to support the entire rotating body, which has a simple structure and convenient maintenance; the traditional old-fashioned separator static guide blades are eliminated, thereby reducing the ventilation resistance of the entire separator, and the rotating cage adopts a new structure to achieve the function of efficiently separating coal powder particles; the central coal drop pipe is provided with a wind shield ring and a sealing pressure plate, so that the high-efficiency rotary separator provided by the present application has reliable sealing performance. Compared with the existing rotary separator, the high-efficiency rotary separator provided by the present application has the characteristics of more efficient separation, more compact structure, and more convenient use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of a high-efficiency rotary separator provided in an embodiment of the present application;

[0020] Figure 2 A schematic diagram of the sealing blade structure of a high-efficiency rotary separator provided in an embodiment of the present application;

[0021] Figure 3 A partial enlarged view of an expansion type distribution box of a high-efficiency rotary separator provided in an embodiment of the present application;

[0022] Figure 4 A partial enlarged view of a hollow shaft of a high-efficiency rotary separator provided in an embodiment of the present application;

[0023] Figure 5 A partial enlarged view of a central coal drop pipe of a high-efficiency rotary separator provided in an embodiment of the present application;

[0024] Figure 6 A top view of a sealing fan blade of a high-efficiency rotary separator provided in an embodiment of the present application;

[0025] Explanation of the accompanying drawings: expansion distribution box 11, inner cone 111, outer cone 112, air seal ring 113, powder outlet 114, hollow shaft 12, rotating cage 13, blades 131, sealing fan blades 132, transmission gear box 14, drive motor 15, central coal drop pipe 16, sealing pressure plate 161, sealing packing 162, wind shield ring 163, shell 21, shell top plate 211, inspection door 212, coal conveying steel pipe 31. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model clearer, the implementation mode of the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0027] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] See attached Figure 1-6 A high-efficiency rotary separator provided in the embodiment of the present application is described in detail. Figure 1 A schematic diagram of the structure of a high-efficiency rotary separator provided in an embodiment of the present application; Figure 2 A schematic diagram of the sealing blade structure of a high-efficiency rotary separator provided in an embodiment of the present application; Figure 3 A partial enlarged view of an expansion type distribution box of a high-efficiency rotary separator provided in an embodiment of the present application; Figure 4A partial enlarged view of a hollow shaft of a high-efficiency rotary separator provided in an embodiment of the present application; Figure 5 A partial enlarged view of a central coal drop pipe of a high-efficiency rotary separator provided in an embodiment of the present application; Figure 6 A top view of the sealing blades of a high-efficiency rotary separator provided in an embodiment of the present application.

[0030] In brief, the basic technical scheme of the utility model is briefly described as follows: a high-efficiency rotary separator, comprising: a shell 21, a drive motor 15, a rotating assembly and an expandable distribution box 11; the drive motor 15 is located above the expandable distribution box 11 for providing power; the rotating assembly is located in the middle of the shell 21 for separating coal powder, and the drive motor 15 and the rotating assembly are connected; the expandable distribution box 11 is located above the shell 21 for distributing and discharging the coal powder separated by the rotating assembly; the expandable distribution box 11 comprises an inner cone 111 and an outer cone 112, the inner cone 111 and the outer cone 112 are in the shape of an inverted cone, and an annular area for wind and powder flow to pass through is formed between the inner cone 111 and the outer cone 112, and the horizontal cross-sectional area of ​​the annular area gradually increases from bottom to top.

[0031] A high-efficiency rotary separator provided by the present application is discussed in detail below.

[0032] like Figure 1 As shown, the present application provides a high-efficiency rotary separator, comprising: the housing 21, the drive motor 15, the rotating assembly and the expandable distribution box 11 mentioned in the above embodiment, and also comprising a transmission gear box 14; a transmission gear box 14 is arranged between the drive motor 15 and the expandable distribution box 11 for transmitting power. A slewing bearing is arranged between the transmission gear box 14 and the rotating assembly for supporting the rotating assembly. The drive motor 15 is connected to the transmission gear box 14; the rotating assembly comprises a hollow shaft 12 and a rotating cage 13.

[0033] like Figure 3As shown, the expansion type distribution box 11 is located in the middle of the rotary separator, above the cage 13, and above the shell top plate 211, and is used to distribute coal powder. The expansion type distribution box 11 includes an inner cone 111 and an outer cone 112, and the inner cone 111 and the outer cone 112 are in the shape of an inverted cone; an annular area for the air-powder flow to pass through is formed between the two inverted cones (the annular area is used to provide a passage for the air-powder flow), and the horizontal cross-section of the inverted cone and the annular area gradually increases from bottom to top, so that the air-powder flow undergoes a process of first compression and then expansion, thereby making the coal powder contained in the air-powder flow more evenly distributed. Among them, the above-mentioned air-powder flow is a mixed airflow including air and coal powder. The inner cone 111 is sleeved on the outer side of the middle section of the hollow shaft 12 of the rotating assembly to guide the air-powder flow; the outer cone 112 is arranged on the outer side of the inner cone 111 to limit the movement direction of the air-powder flow. The top of the inner cone 111 and the top of the expansion type distribution box 11 adopt a detachable structure. After the inner cone 111 is removed, the gap between the rotating cage 13 and the shell top plate 211 can be easily adjusted and checked. The bottom end of the inner cone 111 is higher than the bottom end of the outer cone 112. In the expansion type distribution box 11, a sleeve extending downward is provided at the bottom end of the inner cone 111. The sleeve is sleeved on the outside of the middle section of the hollow shaft 12 of the rotating assembly. There is a gap between the sleeve and the hollow shaft 12 for the sealing air to pass through. The sealing air passes through the gap to form a sealed passage. The inner cone 111 can effectively control the gap between the sleeve and the hollow shaft 12, and it is not easy to expand the gap due to coal powder blowing damage. The effective gap ensures that the sealing air forms a reliable sealing passage. The inner cone 111 and the sleeve are used to protect the hollow shaft 12 from coal powder blowing damage and improve the safety of the equipment; the inner cone 111, the outer cone 112, the sleeve and the hollow shaft 12 are coaxially arranged.

[0034] Specifically, the setting of the inner cone 111 can play a role in guiding flow, thereby preventing the air-powder flow in the area of ​​the right-angled triangle formed by the top plate of the expansion type distribution box 11, the hollow shaft 12 and the inner cone 111 from being effectively discharged, and preventing the air-powder flow from idling in this area, so that the air-powder flow can pass through the expansion type distribution box 11 efficiently. In addition, the inner cone 111 can effectively protect the air sealing ring 113 and the hollow shaft 12 from being damaged by coal powder, thereby improving the safety of the equipment; the outer cone 112 allows the air-powder flow to generate air pressure from the bottom to the top, thereby facilitating the uniform distribution of coal powder in the air-powder flow and reducing the air volume deviation and component deviation of multiple powder outlets 114.

[0035] Furthermore, the top of the inner cone 111 is fixedly connected to the top of the expansion type distribution box 11. Specifically, the top of the inner cone 111 is provided with a connecting flange for fixing the inner cone 111 to the top of the expansion type distribution box 11 or to the powder outlet 114 of the expansion type distribution box 11.

[0036] like Figure 1As shown, during operation, the wind and powder flow flows from the lower part of the shell 21 to the middle and upper parts, and then to the center. In the process of passing through the rotating cage 13, a part of the large-particle coal powder is pushed to the area close to the hollow shaft 12 by the rotating blades 131. Under the interaction of the upward wind and powder flow and the downward centrifugal wind field formed by the rotation of the blades 131, the large-particle coal powder gradually moves toward the windless area in the middle, i.e., the direction of the hollow shaft 12, and then falls back into the coal mill to be re-ground by the grinding rollers.

[0037] The driving motor 15 is installed above the transmission gearbox 14 and on one side of the hollow shaft 12, and is used to generate power and output power to the transmission gearbox 14; a transmission gearbox 14 is provided between the driving motor 15 and the expansion type distribution box 11, and is used to transmit power; the output shaft of the driving motor 15 is connected to the input end of the transmission gearbox 14, and then the power is transmitted to the transmission gearbox 14. In a specific embodiment, the output shaft of the driving motor 15 is inserted downward into the input end of the transmission gearbox 14. In another specific embodiment, the driving motor 15 and the transmission gearbox 14 are connected by pins or flanges. The output end of the transmission gearbox 14 is connected to the rotating assembly through a slewing bearing, and then the power is transmitted to the rotating assembly; the slewing bearing is used to support the rotating assembly; specifically, the output end of the transmission gearbox 14 is provided with a driving gear, and the slewing bearing includes an inner ring and an outer ring. In a specific embodiment, the driving gear is meshed with the outer ring; in another specific embodiment, the driving gear is meshed with the inner ring. The rotating assembly is located in the middle of the housing 21 and is used to separate the coal powder. The rotating assembly is connected to the drive motor 15 through the transmission gear box 14. In a specific embodiment, the inner ring of the slewing bearing is fixed, the outer ring of the slewing bearing is connected to the transmission gear box 14, the outer ring of the slewing bearing is connected to the hollow shaft 12 of the rotating assembly, and the hollow shaft 12 is connected to the rotating cage 13 of the rotating assembly; specifically, the outer ring of the slewing bearing is meshed with the driving gear of the transmission gear box 14, the outer ring of the slewing bearing is screwed and fixed to the hollow shaft 12, and the hollow shaft 12 is screwed and fixed to the rotating cage 13.

[0038] The interior of the shell 21 is hollow to form a cavity, and the hollow shaft 12 is located in the middle of the cavity. Preferably, the hollow shaft 12 and the cavity are coaxially arranged; the hollow shaft 12 is used to provide power to the cage 13. A cage 13 is arranged on the outside of the hollow shaft 12, and the cage 13 is used to separate the coal powder according to coarseness and fineness. It should be noted that the axis close to the hollow shaft 12 of this application is the inner side, and the axis away from the hollow shaft 12 is the outer side. The cage 13 is located in the shell 21, below the expansion type distribution box 11. This application adopts a single cage structure, which effectively reduces the resistance of the equipment body, and can make the wind powder flow more efficient in particle size coal powder separation. The cage 13 is an inverted cone structure, and the horizontal cross-sectional area of ​​the inverted cone structure gradually increases from bottom to top. The inverted cone structure helps to separate the coal powder and select qualified fine coal powder. The power is transmitted from the driving motor 15 to the transmission gearbox 14, the slewing bearing, the hollow shaft 12 and the rotating cage 13 in sequence. The rotating assembly composed of the hollow shaft 12 and the rotating cage 13 is only supported by a "slewing bearing" and moves in a circular motion with it. The transmission gearbox 14 uses a single slewing bearing with a stable structure to support the entire rotating assembly. The higher the speed of the rotating cage 13, the greater the centrifugal force provided, and the finer the coal powder that can pass through the rotating cage 13. The coarse coal powder that cannot pass through the rotating cage 13 returns to the grinding area near the hollow shaft 12 for re-grinding.

[0039] The cage 13 is provided with blades 131 for separating coal powder; a plurality of blades 131 are arranged along the circumference of the side of the inverted cone structure of the cage 13. Preferably, a plurality of blades 131 are evenly arranged along the circumference of the side of the inverted cone structure of the cage 13, and the number of blades 131 ranges from 40 to 100, for example, 40, 50, 60, 70, 80, 90, 100. A first angle is set between the blades 131 and the horizontal plane; a second angle is set between the blades 131 and the vertical plane. The cage 13 is located in the cavity, and there is sufficient internal space between the cage 13 and the inner wall of the shell 21. The coal powder flow is exchanged and diverted in the internal space. When the blades 131 rotate, a centrifugal wind field moving downward can be formed. Through the rotation and screening of the blades 131, the coarser unqualified coal powder flows toward the central axis, and then falls back to the coal mill grinding disc in the grinding area for re-grinding.

[0040] like Figure 2 , Figure 6As shown, a sealing blade 132 is provided at the top of the cage 13 for sealing and preventing the wind and powder flow from escaping. The sealing blade 132 is a rectangular steel plate, which is fixedly installed above the support ring of the cage 13. The fixing method can be screwed or welded. Preferably, the sealing blade 132 is welded above the support ring of the cage 13. The sealing blade 132 is located in the narrow space between the support ring of the cage 13 and the top plate 211 of the shell. There is a certain gap between the sealing blade 132 and the top plate 211 of the shell, thereby improving the separation efficiency of the coal powder. The sealing blade 132 rotates with the blade 131 of the cage 13. During the rotation, the air pressure formed toward the outside of the center of the circle forms a continuous outward centrifugal wind field, which blocks the unseparated wind and powder flow outside the cage 13, prevents the unseparated wind and powder flow from escaping from the gap between the support ring of the cage 13 and the top plate 211 of the shell, and improves the coal powder separation effect. Preferably, the angle between the sealing blade 132 and the horizontal plane is the same as the angle between the blade 131 and the horizontal plane, which is the first angle, to ensure the consistency of the airflow when the cage 13 rotates, prevent the increase of airflow resistance caused by inconsistent angles, and effectively reduce the airflow resistance while playing a sealing role. The qualified coal powder from the separator passes through the blade 131 and enters the inner area of ​​the cage 13, and continues to rise and enter the expansion distribution box 11.

[0041] An air seal ring 113 is provided between the top of the expansion type distribution box 11 and the transmission gear box 14, and the air seal ring 113 is located on the outside of the hollow shaft 12, and is used to achieve a sealing air pressure greater than the internal pressure of the high-efficiency rotary separator, thereby preventing coal powder from entering the transmission gear box 14. The inner cone 111 can effectively protect the air seal ring 113 from being damaged by coal powder, improve equipment safety, and reduce the air volume deviation and component deviation of multiple powder outlets 114. A powder outlet 114 is provided at the top of the expansion type distribution box 11 for outputting finer qualified coal powder. The number of powder outlets 114 is 1 or more, and the plurality of powder outlets 114 is 2, 3, 4, 5, or 6. The shape of the powder outlet 114 can be polygonal, circular, or elliptical. Preferably, the powder outlet 114 is circular.

[0042] like Figure 1 As shown, a maintenance door 212 is provided on the side of the housing 21, and the inside of the equipment can be inspected and repaired through the maintenance door 212 after shutdown. The hollow shaft 12 is vertically arranged in the middle of the high-efficiency rotary separator, and the hollow shaft 12, the transmission gear box 14, the expansion type distribution box 11 and the rotating cage 13 are coaxially arranged. The hollow shaft 12 is sleeved on the outside of the central coal dropping pipe 16, and the central coal dropping pipe 16 is used to convey coal powder; the transmission gear box 14, the expansion type distribution box 11 and the rotating cage 13 are stepped.

[0043] like Figure 4As shown, the gap space between the central coal dropping pipe 16, the hollow shaft 12, and the transmission gear box 14 is continuously filled with sealed air to ensure that the pressure of the sealed air is higher than that of the interior of the high-efficiency rotary separator; in order to prevent the excessive pressure of the sealed air from affecting the internal pressure of the transmission gear box 14, a wind shield ring 163 is also provided on the outside of the hollow shaft 12 and between the hollow shaft 12 and the transmission gear box 14 to keep the pressure of the sealed air entering the transmission gear box 14 higher than the internal pressure of the high-efficiency rotary separator; a wind shield ring 163 is provided on the inner side of the top of the hollow shaft 12 and between the central coal dropping pipe 16 and the hollow shaft 12 to keep the pressure of the sealed air entering the hollow shaft 12 higher than the internal pressure of the high-efficiency rotary separator. In general, the wind shield ring 163 is used to keep the pressure of the sealed air higher than the internal pressure of the high-efficiency rotary separator.

[0044] In the prior art, the coal conveying steel pipe 31 and the central coal dropping pipe 16 are connected by a pair of flanges with the same inner diameter or the coal conveying steel pipe 31 and the central coal dropping pipe 16 are directly welded together. Figure 5As shown, the central coal drop pipe 16 of the present application is connected to the coal feeder through the coal conveying steel pipe 31. The coal feeder is used to provide coal powder, and the coal conveying steel pipe 31 is used to convey coal powder. The central coal drop pipe 16 is sleeved on the outside of the coal conveying steel pipe 31. Specifically, the lower part of the coal conveying steel pipe 31 is inserted into the inside of the central coal drop pipe 16. A sealing pressure plate 161 is provided between the central coal drop pipe 16 and the coal conveying steel pipe 31 for sealing the central coal drop pipe 16. Specifically, the sealing pressure plate 161 is used to compress the sealing packing 162, thereby sealing the central coal drop pipe 16 to ensure that the coal powder in the central coal drop pipe 16 does not overflow. The vertical section of the sealing pressure plate 161 is in a horizontal L-shape, which is convenient for installation on the outside of the central coal drop pipe 16. A sealing packing 162 is provided below the sealing pressure plate 161. The sealing packing 162 can be a filling material such as a graphite packing and a sealing rope. When the high-efficiency rotary separator is working, it is ensured that the internal air pressure does not leak, thereby ensuring that the coal powder does not overflow. During maintenance, it is only necessary to remove the flange bolts connecting the upper part of the coal conveying steel pipe 31 to the coal feeder, and then the coal conveying steel pipe 31 can be slowly lowered into the central coal dropping pipe 16, ensuring that the upper coal conveying steel pipe 31 can be easily lowered into the central coal dropping pipe 16. In the prior art, it is necessary to remove all the connecting flange bolts at the upper and lower ends of the coal conveying steel pipe 31, and then hoist the coal conveying steel pipe 31 out of the area outside the high-efficiency rotary separator before the high-efficiency rotary separator can be repaired. The present application designs a sealing pressure plate 161, which can sink the coal conveying steel pipe 31 into the central coal dropping pipe 16, saving the work of removing the coal conveying steel pipe 31. Specifically, a connecting flange is provided above the top of the central coal drop pipe 16, the diameter of the central coal drop pipe 16 is larger than the coal conveying steel pipe 31, and there is an installation space for the sealing filler 162 between the top of the central coal drop pipe 16 and the connecting flange. The sealing filler 162 is placed in the installation space at the top of the central coal drop pipe 16, and then pressed by the upper sealing pressure plate 161. As the pressure on the sealing filler 162 increases, the sealing filler 162 is laterally squeezed to hold the coal conveying steel pipe 31, completing the sealing of the central coal drop pipe 16 and the coal conveying steel pipe 31. During maintenance, it is only necessary to lift the sealing pressure plate 161 and remove the sealing filler 162, and then the coal conveying steel pipe 31 can be sunk into the central coal drop pipe 16.

[0045] The transmission gearbox 14 has a combined sealing system, and at least one of the following sealing methods is provided at the transmission shaft of the transmission gearbox 14: a rubber end seal, a carbon crystal seal, a labyrinth seal, a skeleton oil seal, and an O-ring. Of course, multiple combined sealing methods can also be provided. This ensures that the lubricating oil does not leak out during the operation of the transmission gearbox 14, and prevents the internal coal powder from invading.

[0046] When in use, the raw coal falls onto the grinding disc of the coal mill through the central coal drop pipe 16. The ground coal powder is blown up by the hot air distributed circumferentially on the outer side of the grinding disc to form an air-powder flow. The hot air has a certain rotation angle. Under the action of centrifugal force, the air-powder flow spirals up along the outer side of the coal mill casing and enters the cavity of the high-efficiency rotary separator. Due to the centrifugal force, the air-powder flow mainly exists in the inner wall area of ​​the cavity. The high-efficiency rotary separator has a single cage structure, which effectively reduces the resistance of the equipment body, and can make the air-powder flow more efficient in separating the particle size coal powder, separating the unqualified coarse coal powder and returning it to the grinding disc for further grinding, and outputting the qualified fine coal powder. The high-efficiency dynamic separator has reliable sealing performance and convenient maintenance.

[0047] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features of the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] For those skilled in the art, the utility model can be implemented by other implementation schemes that do not deviate from its spirit or essential features. Obviously, the utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, it is only an example, not the only one, and the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the utility model. Any figure mark in the claims should not be regarded as limiting the claims involved. All changes within the scope of the utility model or within the scope equivalent to the utility model are included in the utility model.

Claims

1. A high efficiency rotary separator, characterized in that: include: Housing, drive motor, rotating assembly and expandable distribution box; The driving motor is located above the expansion type distribution box and is used to provide power; The rotating assembly is located in the middle of the shell and is used to separate the coal powder. The rotating assembly is connected to the driving motor. The expandable distribution box is located above the shell, and is used to distribute and discharge the coal powder separated by the rotating assembly. The expandable distribution box includes an inner cone and an outer cone. The inner cone and the outer cone are in the shape of an inverted cone. An annular area is formed between the inner cone and the outer cone for the wind and powder flow to pass through; the horizontal cross-sectional area of ​​the annular area gradually increases from bottom to top.

2. The high-efficiency rotary separator according to claim 1, characterized in that: The inner cone is sleeved on the outer side of the middle section of the hollow shaft of the rotating assembly; the top end of the inner cone is connected to the top end of the expansion type distribution box, and the bottom end of the inner cone is higher than the bottom end of the outer cone; A sleeve extending downward is arranged at the bottom end of the inner cone, and the sleeve is sleeved on the outer side of the middle section of the hollow shaft of the rotating assembly, with a gap for sealing air to pass through between the sleeve and the hollow shaft.

3. The high-efficiency rotary separator according to claim 2, characterized in that: A transmission gear box is provided between the driving motor and the expansion type distribution box for transmitting power; A slewing bearing is provided between the transmission gear box and the rotating assembly for supporting the rotating assembly, and the driving motor is connected to the transmission gear box.

4. The high-efficiency rotary separator according to claim 3, characterized in that: The rotating assembly comprises the hollow shaft and a rotating cage. The hollow shaft is screwed and fixed to the outer ring of the slewing bearing. The hollow shaft and the rotating cage are connected by bolts. The outer ring of the slewing bearing is meshed with the transmission gear box.

5. The high-efficiency rotary separator according to claim 4, characterized in that: The rotating cage is in an inverted cone structure, and the horizontal cross-sectional area of ​​the inverted cone structure gradually increases from bottom to top; The rotating cage is provided with blades for separating coal powder; A first angle is set between the blade and the horizontal plane; a second angle is set between the blade and the vertical plane; The plurality of blades are evenly arranged along the circumferential direction of the side surface of the inverted cone structure.

6. The high-efficiency rotary separator according to claim 5, characterized in that: A sealing blade is arranged at the top of the rotating cage. The sealing blade is a rectangular steel plate fixed above the supporting ring of the rotating cage. There is a certain gap between the sealing blade and the top plate of the shell. The angle between the sealing blade and the horizontal plane is the same as the angle between the blade and the horizontal plane.

7. The high-efficiency rotary separator according to claim 3, characterized in that: An air sealing ring is provided between the top end of the expansion type distribution box and the transmission gear box, so as to ensure that the sealing air pressure is greater than the internal pressure of the high-efficiency rotary separator.

8. The high-efficiency rotary separator according to claim 4, characterized in that: The hollow shaft sleeve is arranged outside the central coal dropping pipe, and the central coal dropping pipe is used to convey coal powder; Wind shielding rings are respectively arranged between the central coal dropping pipe and the hollow shaft and between the hollow shaft and the transmission gear box, so as to keep the sealing air pressure greater than the internal pressure of the high-efficiency rotary separator; The central coal dropping pipe is sleeved on the outer side of the coal conveying steel pipe.

9. The high-efficiency rotary separator according to claim 8, characterized in that: A sealing pressure plate is provided between the central coal dropping pipe and the coal conveying steel pipe, and the vertical cross section of the sealing pressure plate is in a transverse L shape; A sealing filler is arranged below the sealing pressure plate.

10. The high-efficiency rotary separator according to claim 1, characterized in that: The top of the expansion type distribution box is provided with a powder outlet for outputting qualified coal powder; An inspection door is provided on the side of the shell for inspection and repair.

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