Detachable blade structure of rotary separator of vertical coal mill

Abstract

A detachable blade structure of a rotary separator of a vertical coal mill comprises a first upper pre-welding piece, a first lower pre-welding piece, a detachable movable ring blade, a movable ring blade fastening bolt, a second upper pre-welding piece, a second lower pre-welding piece, a detachable static ring blade and a static ring blade fastening bolt, and the first upper pre-welding piece and the first lower pre-welding piece are welded to a movable blade hub. The upper portion and the lower portion of the detachable movable ring blade are in bolt connection with the first upper pre-welding piece and the first lower pre-welding piece through movable ring blade fastening bolts respectively. The upper pre-welding part II and the lower pre-welding part II are respectively welded on the static ring framework; the upper part and the lower part of the detachable static ring blade are respectively in bolt connection with the upper pre-welding part II and the lower pre-welding part II through static ring blade fastening bolts; when the vertical coal mill is subjected to medium and minor repair, the moving ring blade and the static ring blade of the rotary separator of the vertical coal mill, which are seriously worn, are replaced, so that the maintenance cost is reduced, and the maintenance time is shortened.

Description

Technical Field

[0001] The utility model relates to a detachable blade structure of a rotary separator of a vertical coal mill. Background Art

[0002] At present, most of the coal powder separators of vertical coal mills in China adopt vertical coal mill rotary separators. The main function of the vertical coal mill rotary separator is to separate the coarse and fine coal powders ground by the coal mill to prevent the coarse coal powders from entering the system. However, during the separation process, the blades of the vertical coal mill rotary separator are greatly worn. After being worn to a certain extent, the separation effect of the vertical coal mill rotary separator decreases, and the coarse coal powders with larger particle size will enter the system, affecting the normal production operation. At this time, the vertical coal mill rotary separator needs to be repaired. However, at present, the vertical coal mill rotary separators are all integral structures, and the blades are welded on the vertical coal mill rotary separator, which is not convenient for replacement and maintenance. The vertical coal mill needs to be overhauled, and the dynamic ring blades and static ring blades of the vertical coal mill rotary separator need to be replaced as a whole. The maintenance cost is high, and the overhaul and maintenance time of the coal mill is as long as 15-20 days. The time is too long, which is not conducive to the long-term safe and stable operation of production. Therefore, it is very necessary to provide a detachable blade structure of a vertical coal mill rotary separator. Utility Model Content

[0003] The utility model aims to replace the dynamic ring blades and static ring blades of the rotary separator of the vertical coal mill which are seriously worn when the vertical coal mill is undergoing medium and minor repairs, thereby reducing the maintenance cost and shortening the maintenance time.

[0004] The purpose of the utility model is achieved as follows: a detachable blade structure of a vertical coal mill rotary separator, comprising an upper pre-weld 1, a lower pre-weld 2, a detachable moving ring blade 3, a moving ring blade fastening bolt 4, an upper pre-weld 2, a lower pre-weld 2, a detachable stationary ring blade 7, and a stationary ring blade fastening bolt 8, wherein the upper pre-weld 1 and the lower pre-weld 2 are respectively welded to the moving blade hub, and the detachable moving ring blade 3 is bolted to the upper pre-weld 1 and the lower pre-weld 2 above and below through the moving ring blade fastening bolt 4; the upper pre-weld 2 and the lower pre-weld 2 are respectively welded to the stationary ring skeleton, and the detachable stationary ring blade 7 is bolted to the upper pre-weld 2 and the lower pre-weld 2 6 above and below through the stationary ring blade fastening bolt 8.

[0005] Preferred are:

[0006] The upper pre-welded part 1 and the lower pre-welded part 2 are respectively provided with two circular holes, the diameter of which is larger than the diameter of the screw rod of the dynamic ring blade fastening bolt 4 and smaller than the diagonal length of the nut of the dynamic ring blade fastening bolt 4;

[0007] The length of the detachable dynamic ring blade 3 is equal to or slightly less than the distance from the upper edge of the upper pre-welded part 1 to the lower edge of the lower pre-welded part 2 after welding, and corresponds to the opening positions of the upper pre-welded part 1 and the lower pre-welded part 2 after welding, and two circular holes with a diameter larger than the screw diameter of the dynamic ring blade fastening bolt 4 and smaller than the diagonal length of the nut of the dynamic ring blade fastening bolt 4 are opened on the upper and lower parts respectively;

[0008] The screw length of the dynamic ring blade fastening bolt 4 is greater than the sum of the thickness of the upper pre-welded part 1 and the detachable dynamic ring blade 3;

[0009] The screw length of the dynamic ring blade fastening bolt 4 is greater than the sum of the thickness of the lower pre-welded part 2 and the detachable dynamic ring blade 3.

[0010] Preferred are:

[0011] The upper pre-welded part 2 5 and the lower pre-welded part 2 6 are respectively provided with two circular holes with diameters larger than the diameter of the screw rod of the stationary ring blade fastening bolt 8 and smaller than the diagonal length of the nut of the dynamic ring blade fastening bolt 8;

[0012] The length of the detachable stationary ring blade 7 is equal to or slightly less than the distance from the upper edge of the upper pre-welded part 2 5 to the lower edge of the lower pre-welded part 2 6 after welding, and corresponds to the opening positions of the upper pre-welded part 2 5 and the lower pre-welded part 2 6 after welding, and two circular holes with a diameter larger than the screw diameter of the stationary ring blade fastening bolt 8 and smaller than the diagonal length of the nut of the stationary ring blade fastening bolt 8 are opened on the upper and lower parts respectively;

[0013] The length of the screw of the stationary ring blade fastening bolt 4 is greater than the sum of the thickness of the upper pre-welded part 5 and the detachable stationary ring blade 7;

[0014] The screw length of the dynamic ring blade fastening bolt 8 is greater than the sum of the thickness of the lower pre-welded part 2 6 and the detachable static ring blade 7.

[0015] After the vertical coal mill rotary separator is ready for medium and minor repairs, the stationary ring blade fastening bolts 8 are removed at the manhole of the upper frame of the vertical coal mill rotary separator, and the detachable stationary ring blades 7 near the manhole are removed to reserve a personnel passage. The maintenance personnel enter the vertical coal mill rotary separator through the personnel passage, remove the detachable moving ring blades 3 by removing the moving ring blade fastening bolts 4, and replace them with new detachable moving ring blades 3; the new detachable moving ring blades 3 are connected to the upper pre-welded part 1 and the lower pre-welded part 2 respectively through the moving ring blade fastening bolts 4. The detachable moving ring blades 3 can be subjected to a dynamic balancing test in advance, and they are installed and fastened one by one according to the installation sequence during installation. After the installation of the detachable moving ring blades 3 is completed, the remaining detachable stationary ring blades 7 are removed by removing the remaining stationary ring blade fastening bolts 8, and the remaining detachable stationary ring blades 7 are replaced. The detachable stationary ring blades 7 are connected to the upper pre-welded part 2 5 and the lower pre-welded part 2 6 respectively through the stationary ring blade fastening bolts 8; after all the detachable stationary ring blades 7 are installed and fastened, and the manhole is closed, the maintenance of the rotary separator is completed and a trial run is carried out. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 shows a schematic structural diagram of a detachable blade structure of a rotary separator of a vertical coal mill;

[0017] Figure 2 shows a schematic diagram of the structure of the upper and lower pre-welded parts 1 and the moving blade hub, the removable moving ring blades, and the moving blade fastening bolts;

[0018] Figure 3 shows a schematic diagram of the structure of the upper and lower pre-welded parts 2, the stationary ring frame, the detachable stationary ring blades, and the stationary ring blade fastening bolts;

[0019] Attached Figure 4 The structure schematic diagram of the moving blade hub and the upper and lower pre-welded parts is shown;

[0020] Attached Figure 5 The schematic diagram of the structure of the stationary ring frame and the upper and lower pre-welded parts 2 is shown.

[0021] Attached Figure 1-5 In the figure, 1. an upper pre-weld part 1, 2. a lower pre-weld part 1, 3. removable moving ring blades, 4. fastening bolts of moving ring blades, 5. an upper pre-weld part 2, 6. a lower pre-weld part 2, 7. removable stationary ring blades, 8. fastening bolts of stationary ring blades. DETAILED DESCRIPTION

[0022] The following is combined with Figure 1-5 The utility model is further described.

[0023] A detachable blade structure of a vertical coal mill rotary separator comprises an upper pre-weld part 1, a lower pre-weld part 2, a detachable moving ring blade 3, a moving ring blade fastening bolt 4, an upper pre-weld part 2 5, a lower pre-weld part 2 6, a detachable stationary ring blade 7, and a stationary ring blade fastening bolt 8. The upper pre-weld part 1 and the lower pre-weld part 2 are respectively welded to the moving blade hub, and the detachable moving ring blade 3 is bolted to the upper pre-weld part 1 and the lower pre-weld part 2 above and below through the moving ring blade fastening bolt 4; the upper pre-weld part 2 5 and the lower pre-weld part 2 6 are respectively welded to the stationary ring frame, and the detachable stationary ring blade 7 is bolted to the upper pre-weld part 2 5 and the lower pre-weld part 2 6 above and below through the stationary ring blade fastening bolt 8.

[0024] Working principle: After the vertical coal mill rotary separator is ready for medium and minor repairs, the stationary ring blade fastening bolts 8 are removed at the manhole of the upper frame of the vertical coal mill rotary separator, and the detachable stationary ring blades 7 near the manhole are removed to reserve a personnel passage. The maintenance personnel enter the vertical coal mill rotary separator through the personnel passage, remove the detachable moving ring blades 3 by removing the moving ring blade fastening bolts 4, and replace them with new detachable moving ring blades 3; the new detachable moving ring blades 3 are connected to the upper pre-welded part 1 and the lower pre-welded part 2 respectively through the moving ring blade fastening bolts 4. The detachable moving ring blades 3 can be subjected to a dynamic balancing test in advance, and they should be installed and fastened one by one in the installation sequence during installation. After the installation of the detachable moving ring blades 3 is completed, the remaining detachable stationary ring blades 7 are removed by removing the remaining stationary ring blade fastening bolts 8, and the remaining detachable stationary ring blades 7 are replaced. The detachable stationary ring blades 7 are connected to the upper pre-welded part 2 5 and the lower pre-welded part 2 6 respectively through the stationary ring blade fastening bolts 8; after all the detachable stationary ring blades 7 are installed and fastened, and the manhole is closed, the maintenance of the rotary separator is completed and a trial run is carried out.

[0025] The utility model is characterized in that the detachable blade structure of the vertical coal mill rotary separator is simple in structure, convenient for on-site maintenance, greatly reducing maintenance costs and prolonging the service life of the equipment.

Claims

1. A detachable blade structure of a rotary separator of a vertical coal mill, comprising an upper pre-welded part (1), a lower pre-welded part (2), a detachable moving ring blade (3), a moving ring blade fastening bolt (4), an upper pre-welded part (5), a lower pre-welded part (6), a detachable stationary ring blade (7), and a stationary ring blade fastening bolt (8), wherein: The upper pre-welded part 1 (1) and the lower pre-welded part 1 (2) are respectively welded to the moving blade hub, and the removable moving ring blade (3) is respectively bolted to the upper pre-welded part 1 (1) and the lower pre-welded part 1 (2) via the moving ring blade fastening bolts (4); the upper pre-welded part 2 (5) and the lower pre-welded part 2 (6) are respectively welded to the stationary ring frame, and the removable stationary ring blade (7) is respectively bolted to the upper pre-welded part 2 (5) and the lower pre-welded part 2 (6) via the stationary ring blade fastening bolts (8).

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