Spherical supporting structure for thrust pad of speed reducer of vertical coal mill

Abstract

The utility model discloses a spherical supporting structure for thrust pads of a speed reducer of a vertical coal mill, which belongs to the technical field of speed reducers of vertical mills, a speed reducer box body and an output flange are mutually supported through the thrust pads, and the spherical supporting structure is characterized in that a supporting block is arranged on the end surface of the speed reducer box body opposite to the thrust pad side; the supporting block is connected with the thrust pad through a first fastening piece, a containing cavity is formed in the thrust pad opposite to the supporting block side, a supporting pad used for mutual supporting of the thrust pad and the supporting block is arranged in the containing cavity, and the supporting block is connected with the thrust pad through a second fastening piece. The supporting end of the supporting pad extends out of the containing cavity to make contact with the supporting block, and the supporting face, making contact with the supporting block, of the supporting pad is a semi-spherical face. According to the utility model, the thrust pad can be transformed from the original plane support to the spherical support, so that the moving freedom degree of the pad surface is increased, and the self-adjustment of the thrust pad surface under the unbalance loading condition is more sufficient; and the problem of heating caused by unbalance loading is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of vertical mill reducers, and in particular relates to a spherical surface supporting structure of a thrust bearing of a coal vertical mill reducer. Background Art

[0002] The thrust bearing of the JLX45 reducer is supported by a plane. When the coal quality changes, the coal quality is uneven, or there are debris, it is easy to cause the load surface of the thrust bearing to be unevenly distributed, resulting in an eccentric load. When the eccentric load phenomenon is more serious, the coating layer of the thrust bearing and the flange mirror surface will rub and heat up. In the case of this type of reducer that only relies on the oil storage in the oil pool for lubrication, the thrust bearing cannot be fully lubricated, and it is easy to burn the bearing.

[0003] The existing vertical mill reducer output flange supports basically all use tilting thrust bearings. Among them, tilting pad thrust bearings are in a key position among all bearings because they bear a considerable load. Generally speaking, the optimal number of thrust pads for thrust bearings is 8-15. As the number of thrust pads increases, the unevenness of the axial load distribution of the thrust bearing also increases, and a small number of thrust pads will lose the advantage of balanced load capacity. Thrust pads generally adopt a fan-shaped structure, and the ratio of the average arc length and width (the difference between the inner and outer radii) of the thrust pads, and the ratio of the outer diameter to the inner diameter should be controlled within a reasonable range. It is also necessary to ensure that the average force-bearing diameter of the thrust pads is consistent with the average force-bearing diameter of the housing.

[0004] The hydrodynamic tilting pad thrust bearing is a tilting support. It forms a layer of pressure oil film in the gap between the output flange and the thrust pad by the relative movement of the reducer output flange and the thrust pad, floats the output flange, and bears the axial force. The bearing capacity of the thrust pad depends on the circumferential speed of the output flange, the viscosity of the lubricating oil, and the size of the axial force. When the speed is not enough, the oil film cannot be formed, and the probability of damage to the reducer thrust pad will be greatly increased, which poses a great safety hazard. Summary of the invention

[0005] In view of the problems existing in the prior art, the utility model provides a spherical support structure for the thrust bearing of a coal vertical mill reducer, which can transform the thrust bearing from the original plane support into a spherical support, thereby increasing the freedom of movement of the bearing surface and making the thrust bearing more self-adjustable when facing an eccentric load condition, thereby solving the problem of heat generation caused by the eccentric load.

[0006] The utility model is implemented as follows: a spherical support structure for the thrust bearing of a coal vertical mill reducer, wherein the reducer housing and the output flange support each other through the thrust bearing, a support block is arranged on the end face of the reducer housing on the side opposite to the thrust bearing, the support block and the thrust bearing are connected with each other through a first fastener, a placement cavity is arranged in the thrust bearing on the side opposite to the support block, a support pad for supporting the thrust bearing and the support block with each other is arranged in the placement cavity, the support block is connected with the thrust bearing through a second fastener, the support end of the support pad extends out of the placement cavity and contacts with the support block, and the support surface where the support pad contacts with the support block is a hemispherical surface.

[0007] Furthermore, an adjustment pad is provided between the support pad and the inner wall of the placement cavity.

[0008] Furthermore, an oil injection pipe is arranged between adjacent thrust shoe gaps, the oil injection pipe is connected to an external oil supply pipeline, and a plurality of oil injection holes are evenly distributed along the axial direction on the oil injection pipe.

[0009] The utility model has the advantages and technical effects: due to the adoption of the above technical solution, the thrust bearing is transformed from the original plane support to a spherical support, the freedom of movement of the bearing surface is increased, and the self-adjustment of the thrust bearing when facing the eccentric load condition is more sufficient; the heating problem caused by the eccentric load is solved;

[0010] Add a special oil spray pipe between the thrust bearing gaps to ensure that the thrust bearing working surface is always in a lubricated state without increasing the oil level in the upper box or leaking oil, ensuring that the oil film is intact, and spraying oil on the output flange mirror surface in time to cool it can also effectively prevent the occurrence of bearing burnout accidents;

[0011] The quality of the coal used is poor, and the reducer is in overload operation for a long time, resulting in frequent failures. This solution can effectively solve the problems of oil leakage, frequent tile burning, and easy damage to the screw cap. When the economic coal is added, the service life of the coal mill reducer is effectively increased, the daily operation and maintenance costs are saved, and the safety and economy of the unit operation are significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure provided by an embodiment of the utility model.

[0013] In the figure: 1. reducer housing; 2. output flange; 3. thrust washer; 4. support block; 5. support pad; 6. adjustment pad; 7. oil injection pipe; 8. oil injection hole. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in combination with the embodiments below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0015] It should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying 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 direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0016] like Figure 1 As shown, the present application provides a spherical support structure for the thrust washer 3 of a coal vertical mill reducer, wherein the reducer housing 1 and the output flange 2 are mutually supported by the thrust washer 3, and a support block 4 is arranged on the end face of the reducer housing 1 opposite to the thrust washer 3, and the support block 4 is connected to the reducer housing 1 by bolts, and the support block 4 is connected to the thrust washer 3 by a first fastener, and the first fastener is a fixing pin, and a placement cavity is arranged in the thrust washer 3 opposite to the support block 4 side, and a support pad 5 for mutual support between the thrust washer 3 and the support block 4 is arranged in the placement cavity, and the support block 4 is connected to the thrust washer 3 by a second fastener, and the second fastener is a bolt, and the supporting end of the support pad 5 extends out of the placement cavity and contacts with the support block 4, and the supporting surface where the support pad 5 contacts with the support block 4 is a hemispherical surface.

[0017] Preferably, an adjustment pad 6 is provided between the support pad 5 and the inner wall of the placement cavity. Specifically, the adjustment pad 6 can be a rubber pad to adjust the support gap between the support pad 5 and the support block 4.

[0018] Preferably, an oil injection pipe 7 is provided between the gaps of adjacent thrust washers 3 , the oil injection pipe 7 is connected to an external oil supply pipeline, and a plurality of oil injection holes 8 are evenly distributed on the oil injection pipe 7 along the axial direction.

[0019] By adopting the above technical solution, the thrust washer 3 is transformed from the original plane support into a spherical support, which increases the freedom of movement of the washer surface, making the thrust washer 3 more self-adjustable when facing an eccentric load condition, and solving the heating problem caused by the eccentric load.

[0020] A special oil injection pipe 7 is added between the gaps of the thrust washer 3 to ensure that the working surface of the thrust washer 3 is always in a lubricated state without increasing the oil level of the upper box and leaking oil, ensuring that the oil film is intact, and timely spraying oil to cool the mirror surface of the output flange 2 can also effectively prevent the occurrence of burning washer accidents;

[0021] The quality of the coal used is poor, and the reducer is in overload operation for a long time, resulting in frequent failures. This solution can effectively solve the problems of oil leakage, frequent tile burning, and easy damage to the screw cap. When the economic coal is added, the service life of the coal mill reducer is effectively increased, the daily operation and maintenance costs are saved, and the safety and economy of the unit operation are significantly improved.

[0022] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A spherical support structure for thrust bearings of a coal vertical mill reducer, wherein the reducer housing and the output flange are mutually supported by thrust bearings, characterized in that: A support block is arranged on the end face of the reducer housing on the side opposite to the thrust washer, and the support block is connected to the thrust washer through a first fastener. A placement cavity is arranged in the thrust washer on the side opposite to the support block, and a support pad for supporting the thrust washer and the support block is arranged in the placement cavity. The support block is connected to the thrust washer through a second fastener, and the support end of the support pad extends out of the placement cavity and contacts the support block, and the support surface where the support pad contacts the support block is a hemispherical surface.

2. The spherical support structure of thrust bearing of coal vertical mill reducer according to claim 1 is characterized in that: An adjustment pad is arranged between the support pad and the inner wall of the placement cavity.

3. The spherical support structure of thrust bearing of coal vertical mill reducer according to claim 1 or 2, characterized in that: An oil injection pipe is arranged between adjacent thrust shoe gaps. The oil injection pipe is connected to an external oil supply pipeline. A plurality of oil injection holes are evenly distributed along the axial direction on the oil injection pipe.

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