Speed reducer and coal mill
By providing an oil outlet on the bearing end cover of the reducer and communicating with the bearing box housing, the lubricating oil is returned to the bearing box housing, which solves the problem of reducer seal failure and lubricating oil leakage, improving safety and reducing costs.
Patent Information
- Application Number
- CN202422432468.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-09
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-10-09
AI Technical Summary
Existing reducers are prone to problems such as seal failure, lubricant leakage and low safety.
A reducer is designed, including an oil outlet on the bearing end cover, which is located at the bottom of the second seal, and a first oil return passage communicating with the oil outlet on the bearing box housing, through which the lubricating oil is returned to the bearing box housing.
It effectively avoids lubricating oil leakage, pollutes the environment, improves sealing and safety, and reduces costs.
Smart Images
Figure CN223019340U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of coal pulverizers, in particular to a speed reducer and a coal pulverizer. Background Art
[0002] A coal pulverizer is a machine that crushes coal blocks and grinds them into coal powder. It is an important auxiliary equipment for a pulverized coal boiler. The coal pulverizer mainly consists of a spiral tube, main bearings, a drum, a speed reducer, large and small gears, a motor, etc. At present, the existing speed reducer uses herringbone cylindrical gears with large loads for speed reduction. The bearings of the speed reducer are lubricated by forced circulation and splashing of oil, and the shaft end seal consists of two forms: groove seal and felt contact seal. During the operation of the speed reducer, the high-line-speed gears violently agitate the lubricating oil in the box body, the temperature in the box increases, the air pressure increases, the splashed oil droplets continuously fill the box body, and penetrate through the bearing balls to the shaft end seal, and finally accumulate in the narrow area between the groove seal and the bearing end cover. Over time, the lubricating oil overflows the felt and leaks out from the shaft diameter, and the seal at the shaft extension end of the speed reducer fails, resulting in lubricating oil leakage, causing waste of lubricating oil. Moreover, the exposed lubricating oil not only pollutes the environment, but also continuously adheres to the coal dust in the air, which is extremely prone to spontaneous combustion and has low safety. Summary of the Utility Model
[0003] The purpose of the utility model is to overcome the deficiencies of the existing speed reducer, such as easy seal failure, lubricating oil leakage and low safety, and provide a speed reducer and a coal pulverizer.
[0004] The technical solution of the utility model provides a speed reducer, which includes an output shaft. Along the extension direction of the output shaft, a bearing, a bearing housing and a bearing end cover are sequentially arranged on the output shaft. The bearing end cover is fixedly connected with the bearing housing. The bearing end cover is provided with a stop, and a shaft end seal is arranged on the stop.
[0005] The shaft end seal includes a first seal with at least one first groove and a second seal with oil absorption property. The inner side surface of the first seal is hermetically connected with the bearing, the outer side surface of the first seal is hermetically connected with the inner side surface of the second seal, and the outer side surface of the second seal is hermetically connected with the inner side surface of the bearing end cover.
[0006] An oil outlet is arranged on the bearing end cover. The oil outlet is located at the bottom of the second seal. A first oil return channel communicating with the oil outlet is arranged on the bearing housing.
[0007] In one of the optional technical solutions, the first end of the first oil return channel communicating with the oil outlet is higher than the second end communicating with the bearing housing.
[0008] In one of the optional technical solutions, a second oil return channel connected to the bearing box housing is provided at the bottom of the bearing, and the second end of the first oil return channel is connected to the second oil return channel.
[0009] In one of the optional technical solutions, a third seal with oil absorption is provided between the first seal and the bearing.
[0010] In one of the optional technical solutions, the second sealing member and the third sealing member are both felt.
[0011] In one of the optional technical solutions, a second groove is provided between the bearing end cover and the output end shaft, and a skeleton oil seal is provided in the second groove.
[0012] In one of the optional technical solutions, a fourth seal is provided between the bearing end cover and the bearing box housing.
[0013] In one of the optional technical solutions, the fourth sealing member is highland barley paper.
[0014] In one of the optional technical solutions, the number of the first grooves is multiple.
[0015] The technical solution of the utility model also provides a coal mill, comprising the reducer as described above.
[0016] After adopting the above technical scheme, the following beneficial effects are achieved: by providing an oil outlet on the bearing end cover, and the oil outlet is located at the bottom of the second seal, and providing a first oil return channel connected to the oil outlet on the bearing box housing, the lubricating oil can be returned to the bearing box housing through the first oil return channel after the second seal is saturated with oil, thereby avoiding oil leakage and environmental pollution, without reducing the oil supply pressure, so that all rotating parts are fully lubricated, avoiding the burning of parts, improving safety and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The disclosure of the present invention will become easier to understand with reference to the accompanying drawings. It should be understood that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In the drawings:
[0018] Figure 1 A schematic diagram of the structure of a reducer provided in one embodiment of the utility model;
[0019] Figure 2 This is a schematic diagram of the reducer structure from another perspective;
[0020] Figure 3 for Figure 2 A top view of
[0021] Figure 4 forFigure 2 Left view.
[0022] List of reference numerals:
[0023] 1 - Output shaft; 2 - Bush; 3 - Bearing; 4 - First seal; 5 - Second seal; 6 - Bearing end cover; 7 - Fixing part; 8 - Second oil return channel; 9 - Bearing housing; 10 - Gear; 11 - Lubricating oil; 12 - Third seal; 13 - First oil return channel; 14 - Oil outlet; 15 - Skeleton oil seal; 16 - Second groove. Detailed implementation manners
[0024] The following further illustrates the detailed implementation manners of the present utility model with reference to the drawings.
[0025] It is easy to understand that according to the technical solution of the present utility model, under the condition of not changing the essential spirit of the present utility model, there are various structural forms and implementation manners that can be mutually replaced by those of ordinary skill in the art. Therefore, the following detailed implementation manners and the drawings are only exemplary descriptions of the technical solution of the present utility model, and should not be regarded as the whole of the present utility model or as a limitation or restriction on the technical solution of the utility model.
[0026] The orientation terms such as up, down, left, right, front, back, front side, back side, top, bottom, etc. mentioned or possibly mentioned in this specification are defined relative to the structures shown in the respective drawings, and they are relative concepts. Therefore, they may change accordingly according to their different positions and different usage states. Therefore, these or other orientation terms should not be construed as restrictive terms.
[0027] As Figures 1-4 shown, a speed reducer provided by an embodiment of the present utility model includes an output shaft 1. Along the extension direction of the output shaft 1, a bearing 3, a bearing housing 9 and a bearing end cover 6 are sequentially arranged on the output shaft 1. The bearing end cover 5 is fixedly connected to the bearing housing 9. The bearing end cover 6 is provided with a rabbet, and the rabbet is provided with a shaft end seal.
[0028] The shaft end seal includes a first seal 4 having at least one first groove and a second seal 5 having oil absorption property. The inner side surface of the first seal 4 is sealingly connected to the bearing 3, the outer side surface of the first seal 4 is sealingly connected to the inner side surface of the second seal 5, and the outer side surface of the second seal 5 is sealingly connected to the inner side surface of the bearing end cover 6.
[0029] An oil outlet 14 is provided on the bearing end cover 6. The oil outlet 14 is located at the bottom of the second seal 5. A first oil return channel 13 communicating with the oil outlet 14 is provided on the bearing housing 9.
[0030] The speed reducer mainly includes an output shaft 1, a shaft sleeve 2, bearings 3, a bearing housing 9, a bearing end cover 6, and a gear 10. The gear 10, shaft sleeve 2, bearings 3, and bearing end cover 6 are arranged in sequence along the length extension direction of the output shaft 1. One end of the output shaft 1 is a free end, and a back wheel is installed to transmit the kinetic energy of the motor to the mill roller and drive the roller to rotate.
[0031] The shaft sleeve 2 is used to fix the gear 10 and the bearings 3 to prevent the gear 10 and the bearings 3 from moving and rubbing against each other when the output shaft 1 rotates.
[0032] The bearing housing 9 is filled with lubricating oil 11. During operation, the tooth ends of the gear 10 are immersed in the lubricating oil 11. As the gear 10 rotates, the lubricating oil 11 covers the tooth surface of the gear 10 to lubricate the meshing surface and prevent the meshing surface from burning out due to high temperature.
[0033] The bearing end cover 6 is fixedly connected to the bearing housing 9 through a fixing member 7. A stop is provided on the inner side of the bearing end cover 6. The stop is used to gradually push and fix the bearing end cover 6, the first seal 4, the bearings 3, the shaft sleeve 2, and the output shaft 1 to prevent the components from colliding and rubbing against each other when the output shaft 1 rotates. A shaft end seal is provided in the stop to seal the free end of the output shaft 1. The shaft end seal includes a first seal 4 and a second seal 5. The first seal 4 has at least one first groove, so that the lubricating oil 11 splashed from the bearing housing 9 continuously accumulates in the first groove to achieve sealing.
[0034] An oil outlet 14 is provided at the middle lower part of the bearing end cover 6, and the oil outlet 14 is located at the bottom of the second seal 5. A first oil return channel 13 is provided on the bearing housing 9 at the middle lower part of the bearing 3. The first oil return channel 13 is directly opposite to the oil outlet 14, so as to form a smooth passage between the second seal 5 and the bearing housing 9, so that the lubricating oil accumulated at the second seal 5 flows into the bearing housing 9 through the first oil return channel 13, avoiding a large amount of lubricating oil from accumulating inside the bearing end cover 6, resulting in seal failure and lubricating oil leakage.
[0035] In this embodiment, by providing an oil outlet on the bearing end cover, and the oil outlet is located at the bottom of the second seal, and a first oil return channel communicating with the oil outlet is provided on the bearing housing. Through the first oil return channel, the lubricating oil can be returned to the bearing housing after the second seal is saturated with oil absorption, avoiding oil leakage, polluting the environment, without reducing the oil supply pressure, enabling full lubrication of each rotating component, avoiding component burnout, improving safety, and reducing costs.
[0036] In one of the embodiments, the first end of the first oil return channel 13 communicating with the oil outlet 14 is higher than the second end communicating with the bearing housing 9, so that the first oil return channel 13 has an inclined angle to facilitate the return of the lubricating oil at the oil outlet 14 to the bearing housing 9.
[0037] In one of the embodiments, a second oil return channel 8 communicating with the bearing box housing 9 is provided at the bottom of the bearing 3 , and a second end of the first oil return channel 13 is communicated with the second oil return channel 8 .
[0038] A second oil return channel 8 is arranged in the middle position of the outer ring of the bearing 3, and a through hole is arranged in the middle lower part of the bearing box housing 9. The second oil return channel 8 is connected with the through hole of the bearing box housing 9 and is used to evacuate excess lubricating oil on the ball surface of the bearing 3. The lubricating oil can flow back into the bearing box housing 9 through the second oil return channel 8, thereby reducing the flow of lubricating oil to the shaft seal, further improving the sealing performance and avoiding oil leakage.
[0039] In one embodiment, in order to further improve the sealing performance and avoid oil leakage, a third sealing member 12 with oil absorption is provided between the first sealing member 4 and the bearing 3 .
[0040] In one embodiment, in order to further reduce the cost, the second sealing member 5 and the third sealing member 12 are both made of felt.
[0041] In one of the embodiments, a second groove 16 is provided between the bearing end cover 6 and the output end shaft 1, and a skeleton oil seal 15 is provided in the second groove 16. The second groove 16 is arranged on the inner side of the shaft hole through the bearing end cover 6 and the output end shaft 1 to further improve the sealing performance and avoid oil leakage.
[0042] In one of the embodiments, a fourth seal is provided between the bearing end cover 6 and the bearing box housing 9. The fourth seal is arranged between the outer ring direction of the stop of the bearing end cover 6 and the bearing box housing 9 to further improve the sealing performance and avoid oil leakage.
[0043] In one embodiment, in order to further reduce the cost, the fourth sealing member is highland barley paper.
[0044] In one embodiment, there are multiple first grooves, and the multiple first grooves form a sawtooth shape, so that the lubricating oil passes through multiple stages of vortexes inside the first grooves, achieving step-by-step flow reduction of the lubricating oil, avoiding oil leakage, and further improving the sealing performance.
[0045] The technical solution of the utility model also provides a coal mill, comprising the reducer as described above.
[0046] The above description is only the principle and preferred embodiment of the utility model. It should be pointed out that for ordinary technicians in this field, on the basis of the principle of the utility model, several other variations can be made, which should also be regarded as the protection scope of the utility model.
Claims
1. A reducer, characterized in that: The output end shaft comprises an output end shaft, on which a bearing, a bearing housing and a bearing end cover are arranged in sequence along the extension direction of the output end shaft, the bearing end cover is fixedly connected to the bearing housing, the bearing end cover is provided with a stopper, and the stopper is provided with a shaft end seal. The shaft end seal comprises a first seal having at least one first groove and a second seal having oil absorption, the inner side of the first seal is sealed to the bearing, the outer side of the first seal is sealed to the inner side of the second seal, and the outer side of the second seal is sealed to the inner side of the bearing end cover; The bearing end cover is provided with an oil outlet, the oil outlet is located at the bottom of the second sealing member, and the bearing box housing is provided with a first oil return channel connected with the oil outlet.
2. The reducer according to claim 1, characterized in that: A first end of the first oil return passage communicating with the oil outlet is higher than a second end communicating with the bearing box housing.
3. The reducer according to claim 1 or 2, characterized in that: A second oil return passage communicating with the bearing box housing is provided at the bottom of the bearing, and a second end of the first oil return passage is communicated with the second oil return passage.
4. The reducer according to claim 1, characterized in that: A third seal having oil absorption property is provided between the first seal and the bearing.
5. The reducer according to claim 4, characterized in that: The second sealing member and the third sealing member are both made of felt.
6. The reducer according to claim 1, characterized in that: A second groove is provided between the bearing end cover and the output end shaft, and a skeleton oil seal is provided in the second groove.
7. The reducer according to claim 1, characterized in that: A fourth sealing member is provided between the bearing end cover and the bearing box housing.
8. The reducer according to claim 7, characterized in that: The fourth sealing member is highland barley paper.
9. The reducer according to any one of claims 1 to 8, characterized in that: The number of the first grooves is multiple.
10. A coal mill, characterized in that: Comprising a reducer as described in any one of claims 1-9.