Bearing sealing structure, unloading gear box and harvester

Abstract

The invention provides a bearing sealing structure, an unloading gear box and a harvester, the bearing sealing structure comprises a mounting base body and a rotating shaft, the mounting base body is provided with a bearing hole, the rotating shaft is sleeved with a working bearing, a first sealing ring and a second sealing ring, the working bearing, the first sealing ring and the second sealing ring are all arranged in the bearing hole, and the first sealing ring and the second sealing ring are arranged in the bearing hole. The first sealing ring and the second sealing ring are located on the same side of the working bearing, and a buffering cavity is formed between the first sealing ring and the second sealing ring. An impurity discharging channel is arranged in the installation base body, one end of the impurity discharging channel extends upwards in an inclined mode and is communicated with the buffering cavity, and the other end of the impurity discharging channel is communicated with the outside of the installation base body. By the adoption of the gear box bearing, the buffer cavity is formed between the first sealing ring and the second sealing ring, under the combined action of the buffer cavity and the impurity discharging channel, harmful media have sufficient time to be discharged along the impurity discharging channel, excessive accumulation of the harmful media such as silt and water vapor is avoided, and the sealing performance of the gear box bearing is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of grain collecting modules of harvesting machinery, and in particular to a bearing sealing structure, a grain unloading gear box and a harvester. Background Art

[0002] The unloading gearbox is a key component of the harvester's grain collecting module, providing the necessary power. Its performance is closely linked to unloading performance, which in turn impacts harvesting efficiency throughout the entire season. During grain transport, the hoisting auger welds are subject to alternating loads and loads generated by vibration excitation. The unloading gearbox's output shaft bearings must not only withstand these loads but also must be able to withstand a certain amount of axial alternating load to ensure smooth and efficient operation of the unloading drum assembly.

[0003] However, when the harvester is running, there are harmful media such as mud and sand in the working environment. At the same time, because the output shaft of the grain unloading gear box is arranged vertically, the harvested grain and mud and sand in the external environment can easily penetrate into the box through the lip seal, affecting the sealing of the output shaft bearing in the grain unloading gear box, causing problems in the gear box operation.

[0004] When two lip seals installed opposite to each other are used to form a double lip seal structure, the outer lip seal can prevent harmful media such as mud and sand from entering, and the inner lip seal prevents the lubricating oil in the box from leaking out. However, when this structure is used for a long time, the mud and sand that penetrates from the upper lip seal gradually accumulates between the two lip seals, causing the mud and sand to penetrate into the box through the lower lip seal, resulting in insufficient sealing. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: how to improve the sealing performance of the gearbox bearing.

[0006] The technical solution of the present invention to solve the above technical problems is as follows: The present invention provides a bearing sealing structure, including a mounting base and a rotating shaft, wherein the mounting base is provided with a bearing hole, and the rotating shaft is sleeved with a working bearing, a first sealing ring and a second sealing ring, the working bearing, the first sealing ring and the second sealing ring are all arranged in the bearing hole, the first sealing ring and the second sealing ring are located on the same side of the working bearing, and a buffer cavity is provided between the first sealing ring and the second sealing ring; a debris removal channel is provided in the mounting base, one end of the debris removal channel extends obliquely upward and is connected to the buffer cavity, and the other end of the debris removal channel is connected to the outside of the mounting base.

[0007] The beneficial effects of the present invention are: By adopting the present invention, harmful media from the outside are isolated by the first sealing ring, and the second sealing ring seals the lubricating oil while isolating a small amount of harmful media that penetrates from the first sealing ring, thereby effectively protecting the environmental cleanliness of the working bearing; at the same time, a buffer cavity is formed between the first sealing ring and the second sealing ring, and the buffer cavity and the impurity discharge channel work together to slow down the speed at which harmful media such as fine mud and water vapor penetrate into the bearing hole, so that the harmful media have sufficient time to be discharged along the impurity discharge channel, thereby avoiding excessive accumulation of harmful media such as mud and water vapor, and improving the sealing performance of the gearbox bearing.

[0008] On the basis of the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, the bearing hole includes a first hole section, a second hole section and a third hole section which are arranged in sequence along the axial direction and whose diameters decrease successively. The working bearing is arranged in the first hole section, the first sealing ring and the second sealing ring are both arranged in the second hole section, and the third hole section and the rotating shaft are clearance-fitted.

[0010] The step structure formed between the first hole segment and the second hole segment can limit the outer ring of the working bearing, improve the stability of the working bearing, and at the same time reduce the amount of lubricating oil overflow from the working bearing, thereby improving the sealing performance of the second sealing ring to the lubricating oil; the step structure formed between the second hole segment and the third hole segment cooperates with the first sealing ring to facilitate improving the sealing performance of the first sealing ring to external harmful media and reducing the harmful media entering the buffer cavity.

[0011] Furthermore, the mounting base includes a shell and a bearing end cover, the shell is provided with a mounting hole, the bearing end cover extends into the mounting hole and is fixedly connected to the shell, and the bearing hole is located in the end cover.

[0012] The step-shaped first hole section, second hole section and third hole section are processed through the bearing end cover, the processed parts are small, and the processing difficulty and cost are reduced.

[0013] Furthermore, the impurity removal channel includes a first through hole provided in the shell and a second through hole provided in the bearing end cover, the first end of the second through hole is inclined along the direction from the working bearing to the first sealing ring and extends to the buffer cavity, the second end of the second through hole extends to the outer peripheral surface of the bearing end cover, the first end of the first through hole extends to the inner wall of the mounting hole of the shell and is connected to the second end of the second through hole, and the second end of the first through hole extends to the outside of the shell; the first through hole is perpendicular to the mounting hole of the shell.

[0014] The first end of the second through hole is arranged obliquely upward, which facilitates the outflow of harmful media that have penetrated into the first sealing ring, with little change in flow direction, thereby improving the efficiency of removing harmful media and extending the service life of the second sealing ring; the first through hole and the second through hole are processed separately, so that the first through hole and the mounting hole of the shell can be arranged vertically, avoiding the difficulty of increasing the corner between the first through hole and the second through hole, the first through hole occupies a small space, and the processing cost is low.

[0015] Furthermore, the bearing end cover is provided with an outer flange structure at one end facing the outer side of the shell, and the mounting hole is provided with a limiting step at one end facing the outer side of the shell. The outer flange structure is fitted with the limiting step and connected by screws.

[0016] The sealing performance of the bearing end cover to the mounting hole is improved. At the same time, the screw hole can be positioned to ensure that the first end of the first through hole can face and connect with the second end of the second through hole each time the installation is carried out, and the installation is convenient.

[0017] Furthermore, a sealing groove is provided on the outer periphery of the bearing end cover, an O-ring is provided in the sealing groove, and the O-ring is in sealing contact with the inner wall of the mounting hole of the housing; the sealing groove and the O-ring are located on the side of the second through hole close to the working bearing.

[0018] The sealing performance between the bearing end cover and the housing is improved, the leakage of lubricating oil is avoided, and at the same time, the harmful medium discharged from the second through hole is prevented from entering the housing again along the mounting hole.

[0019] Furthermore, variable diameter steps are provided on the outer periphery of the bearing end cover and the inner wall of the mounting hole corresponding to each other, the sealing groove and the O-ring are located on the small diameter side of the variable diameter step, and the second end of the second through hole is located on the large diameter side of the variable diameter step.

[0020] The sealing performance between the second end of the second through hole and the interior of the mounting hole is improved, thereby preventing harmful media discharged from the second through hole from entering the housing along the mounting hole again.

[0021] The present invention also provides a grain unloading gear box, including a gear box body, in which an input shaft and an output shaft are rotatably installed. The gear box body is also provided with the above-mentioned bearing sealing structure, wherein the input shaft or the output shaft is the rotating shaft of the bearing sealing structure.

[0022] It avoids excessive accumulation of harmful media such as mud, sand, and water vapor in the bearing hole, and improves the bearing sealing of the grain unloading gear box.

[0023] Furthermore, the output shaft is the rotating shaft of the bearing sealing structure; the output shaft is arranged vertically, the lower end of the output shaft is connected to the mounting base through a tapered roller bearing, and the input shaft and the output shaft are connected through a bevel gear pair.

[0024] The output shaft is used to provide power for the harvester's lifting auger, improving the output shaft's ability to withstand the alternating load, vibration load and axial load of the lifting auger weld, ensuring smooth and efficient operation of the grain unloading drum assembly.

[0025] The present invention also provides a harvester, comprising a harvester body, on which the above-mentioned grain unloading gear box is installed.

[0026] The grain unloading gear box has a long service life and low maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the bearing sealing structure of the present invention.

[0028] Figure 2 It is a structural schematic diagram of the grain unloading gear box of the present invention.

[0029] In the accompanying drawings, the technical features represented by the reference numerals are as follows: 1-housing; 2-bearing end cover; 3-rotating shaft; 4-working bearing; 5-first sealing ring; 6-second sealing ring; 7-buffer cavity; 8-exhaust channel; 81-first through hole; 82-second through hole; 9-first hole section; 10-second hole section; 11-third hole section; 12-O-ring; 13-limiting step; 14-diameter reducing step; 20-Input shaft; 21-Output shaft. DETAILED DESCRIPTION

[0030] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0031] The present invention refers to Figure 1-2 .

[0032] Example 1, as Figure 1 As shown: The present invention provides a bearing sealing structure, including a mounting base and a rotating shaft 3, the mounting base being provided with a bearing hole, the rotating shaft 3 being sleeved with a working bearing 4, a first sealing ring 5 and a second sealing ring 6, the working bearing 4, the first sealing ring 5 and the second sealing ring 6 being all arranged in the bearing hole, the first sealing ring 5 and the second sealing ring 6 being located on the same side of the working bearing 4, and a buffer cavity 7 being provided between the first sealing ring 5 and the second sealing ring 6; an impurity discharge channel 8 being provided in the mounting base, one end of the impurity discharge channel 8 extending obliquely upward and communicating with the buffer cavity 7, and the other end of the impurity discharge channel 8 being communicated with the outside of the mounting base.

[0033] principle: The mounting base can be the housing 1 of any transmission gearbox, and the rotating shaft 3 can be the output shaft 21 or the input shaft 20. The rotating shaft 3 rotates relative to the bearing hole via the working bearing 4. A first sealing ring 5, located farther from the working bearing 4, is used to block most harmful media such as mud and sand from the mounting base. A second sealing ring 6, located closer to the working bearing 4, is used to prevent lubricating oil leakage from the working bearing 4. A small amount of fine mud, sand, water vapor, and other harmful media that infiltrates through the first sealing ring 5 enters the buffer cavity 7. The second sealing ring 6 prevents further entry of the fine mud, sand, water vapor, and other harmful media into the space surrounding the working bearing 4. Simultaneously, the harmful media can be discharged along the impurity discharge channel 8, preventing excessive accumulation of harmful media such as mud, sand, and water vapor.

[0034] Generally speaking, because the output shaft of the grain unloading gear box is in a vertical state when it is installed in the harvester, that is, the rotating shaft 3 is arranged vertically, and at the same time, the harmful media in the working environment are often mixed with water, air flow, etc. to increase fluidity, so a small amount of harmful media can penetrate downward from the first sealing ring 5 into the buffer cavity 7 of the bearing hole. Since one end of the impurity removal channel 8 extends obliquely upward and is connected to the buffer cavity 7, that is, the direction of the impurity removal channel 8 from the buffer cavity 7 to the outside is obliquely downward, the medium that penetrates into the buffer cavity 7 can only flow out along the impurity removal channel 8 under the action of gravity, and cannot enter the buffer cavity 7 from the impurity removal channel 8. In addition, when the rotating shaft 3 is arranged obliquely or horizontally, it only affects the amount of harmful media that penetrate into the buffer cavity 7 from the first sealing ring 5, and still will not enter the buffer cavity 7 from the impurity removal channel 8. Therefore, the arrangement direction of the rotating shaft 3 is not a necessary technical feature.

[0035] Preferably, there are multiple impurity removal channels 8 distributed around the bearing hole.

[0036] Preferably, the first sealing ring 5 and the second sealing ring 6 are both lip-shaped sealing rings, and the back surfaces of the two lip-shaped sealing rings are arranged opposite to each other.

[0037] Note: The lip side of the lip seal is the front side, and the side without lip is the back side.

[0038] It is convenient to isolate external harmful media through the first sealing ring 5 and the second sealing ring 6 to isolate lubricating oil, thereby improving sealing performance.

[0039] By adopting the present invention, the first sealing ring 5 is used to isolate external harmful media, and the second sealing ring 6 seals the lubricating oil while isolating a small amount of harmful media that penetrates from the first sealing ring 5, thereby effectively protecting the environmental cleanliness of the working bearing 4; at the same time, a buffer cavity 7 is formed between the first sealing ring 5 and the second sealing ring 6. The buffer cavity 7 and the impurity discharge channel 8 work together to slow down the speed at which harmful media such as fine mud and water vapor penetrate into the bearing hole, so that the harmful media have sufficient time to be discharged along the impurity discharge channel 8, thereby avoiding excessive accumulation of harmful media such as mud and water vapor, and improving the sealing performance of the gearbox bearing.

[0040] Furthermore, the bearing hole includes a first hole section 9, a second hole section 10 and a third hole section 11 which are arranged in sequence along the axial direction and whose diameters decrease successively. The working bearing 4 is arranged in the first hole section 9, the first sealing ring 5 and the second sealing ring 6 are both arranged in the second hole section 10, and the third hole section 11 and the rotating shaft 3 are clearance-fitted.

[0041] The step structure formed between the first hole section 9 and the second hole section 10 can limit the outer ring of the working bearing 4, improve the stability of the working bearing 4, and at the same time reduce the amount of lubricating oil overflow from the working bearing 4, thereby improving the sealing performance of the second sealing ring 6 to the lubricating oil; the step structure formed between the second hole section 10 and the third hole section 11 cooperates with the first sealing ring 5 to facilitate improving the sealing performance of the first sealing ring 5 to external harmful media and reducing the harmful media entering the buffer cavity 7.

[0042] Furthermore, the mounting base includes a shell 1 and a bearing end cover 2. The shell 1 is provided with a mounting hole. The bearing end cover 2 extends into the mounting hole and is fixedly connected to the shell 1. The bearing hole is located in the end cover.

[0043] The step-shaped first hole section 9, the second hole section 10 and the third hole section 11 are machined through the bearing end cover 2, so that the machined parts are small, and the machining difficulty and cost are reduced.

[0044] Furthermore, the impurity removal channel 8 includes a first through hole 81 provided in the housing 1 and a second through hole 82 provided in the bearing end cover 2. The first end of the second through hole 82 is inclined along the direction from the working bearing 4 to the first sealing ring 5 and extends to the buffer cavity 7. The second end of the second through hole 82 extends to the outer peripheral surface of the bearing end cover 2. The first end of the first through hole 81 extends to the inner wall of the mounting hole of the housing 1 and is connected to the second end of the second through hole 82. The second end of the first through hole 81 extends to the outside of the housing 1; the first through hole 81 is perpendicular to the mounting hole of the housing 1.

[0045] The first end of the second through hole 82 is arranged obliquely upward, which facilitates the outflow of harmful media that have penetrated into the first sealing ring 5, with little change in flow direction, thereby improving the efficiency of removing harmful media and extending the service life of the second sealing ring 6; the first through hole 81 and the second through hole 82 are processed separately, so that the first through hole 81 and the mounting hole of the shell 1 can be arranged vertically, avoiding the increased difficulty of the corner between the first through hole 81 and the second through hole 82, and the first through hole 81 occupies a small space and has a low processing cost.

[0046] Furthermore, the bearing end cover 2 is provided with an outer flange structure at one end facing the outer side of the housing 1, and the mounting hole is provided with a limiting step 13 at one end facing the outer side of the housing 1. The outer flange structure is fitted with the limiting step 13 and connected by screws.

[0047] The sealing performance of the bearing end cover 2 to the mounting hole is improved. At the same time, the screw hole can be positioned to ensure that the first end of the first through hole 81 can face and connect with the second end of the second through hole 82 each time it is installed, making installation convenient.

[0048] Furthermore, a sealing groove is provided on the outer periphery of the bearing end cover 2, in which an O-ring 12 is provided. The O-ring 12 is in sealing contact with the inner wall of the mounting hole of the housing 1; the sealing groove and the O-ring 12 are located on the side of the second through hole 82 close to the working bearing 4.

[0049] The sealing performance between the bearing end cover 2 and the housing 1 is improved, and the leakage of lubricating oil is avoided. At the same time, the harmful medium discharged from the second through hole 82 is prevented from entering the housing 1 again along the mounting hole.

[0050] Furthermore, reducing steps 14 are provided on the outer periphery of the bearing end cover 2 and the inner wall of the mounting hole corresponding to each other, the sealing groove and the O-ring 12 are located on the small diameter side of the reducing step 14, and the second end of the second through hole 82 is located on the large diameter side of the reducing step 14.

[0051] Note: One section of the mounting holes on the bearing end cover 2 and the housing 1 has a larger diameter, while the other section has a smaller diameter. The transition between the two sections forms a reducing step 14. The section with the larger diameter is called the large diameter side of the reducing step 14, and the section with the smaller diameter is called the small diameter side of the reducing step 14.

[0052] The sealing performance between the second end of the second through hole 82 and the interior of the mounting hole is improved, thereby preventing the harmful medium discharged from the second through hole 82 from entering the housing 1 along the mounting hole again.

[0053] Example 2, as Figure 2 As shown: The present invention also provides a grain unloading gear box, including a gear box body, in which an input shaft 20 and an output shaft 21 are rotatably installed. The gear box body is also provided with the above-mentioned bearing sealing structure, wherein the input shaft 20 or the output shaft 21 is the rotating shaft 3 of the bearing sealing structure.

[0054] principle: The mounting base is a shell-type structure. Both the input shaft 20 and the output shaft 21 are connected to the mounting base via bearings. The ends of the input shaft 20 and the output shaft 21 extending into the mounting base are connected by a gear transmission, thus forming the gearbox body. The input shaft 20 or the output shaft 21 serves as the rotating shaft 3 of the bearing seal structure, indicating that the bearing seal structure corresponds to the former, i.e., it is used to seal the working bearing 4 on the input shaft 20 or the working bearing 4 on the output shaft 21.

[0055] It avoids excessive accumulation of harmful media such as mud, sand, and water vapor in the bearing hole, and improves the bearing sealing of the grain unloading gear box.

[0056] Furthermore, the output shaft 21 is the rotating shaft 3 of the bearing sealing structure; the output shaft 21 is arranged vertically, the lower end of the output shaft 21 is connected to the mounting base through a tapered roller bearing, and the input shaft 20 and the output shaft 21 are connected through a bevel gear pair.

[0057] Note: The input shaft 20 and the output shaft 21 are connected through a bevel gear pair, that is, the bevel gear on the input shaft 20 is meshed with the bevel gear on the output shaft 21.

[0058] The output shaft 21 is used to provide power for the lifting auger of the harvester, which improves the output shaft 21's ability to withstand alternating loads, vibration loads, and axial loads of the lifting auger weld, ensuring smooth and efficient operation of the grain unloading drum assembly.

[0059] Example 3: The present invention also provides a harvester, comprising a harvester body, on which the above-mentioned grain unloading gear box is installed.

[0060] The grain unloading gear box has a long service life and low maintenance cost.

[0061] In the description of the present invention, it should be understood that if there appear descriptive terms indicating orientation, direction or positional relationship, such as: "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated in this specification is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of understanding the present invention and simplifying the description, and does not indicate or imply that the part, element or whole referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0062] In addition, if there are order description terms, such as "first", "second", etc., their purpose in this specification is to facilitate understanding or simplify the description. For example, in order to distinguish multiple technical features with the same type or function, but they have to be mentioned separately, this specification may use prefix or suffix order description terms to distinguish them. Therefore, it cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0063] In the present invention, if terms describing the relative functional relationship of structures are used, such as "install", "connect", "connect", "fix", etc., they should be understood in a broad sense unless otherwise clearly specified and limited. For example, "install", "connect", "connect", etc. can be fixed connections, detachable connections, or integrated; can be directly connected, or indirectly connected through an intermediate medium, can be internal communication between two elements, or an interactive relationship between two elements; "fix" can be fixed to form an integral body, or can be detachably fixed through fasteners; can be directly fixed, or can be fixed through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above-mentioned descriptive terms in the present invention can be understood according to the specific circumstances, the context, the coherence of the preceding and following texts, etc.

[0064] In the present invention, if descriptive terms with ancillary or connecting meaning appear, for example, a first feature being "on" or "below" a second feature, these should not be construed in a limiting sense unless otherwise expressly specified or limited. For example, "on" or "below" may refer to direct contact between the first and second features, or indirect contact between the first and second features through an intermediary. Persons of ordinary skill in the art will understand the specific meanings of these descriptive terms in the present invention based on the specific circumstances, context, and coherence of the preceding and following texts.

[0065] Furthermore, when a first feature is “above,” “above,” or “above” a second feature, it may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. When a first feature is “below,” “below,” or “below” a second feature, it may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0066] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments, examples and features of different embodiments and examples described in this specification, unless there is any contradiction, and these combinations or combinations should all fall within the scope of the present invention.

[0067] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are illustrative and are not to be construed as limiting the present invention. Changes, modifications, substitutions and variations of the above embodiments made by persons of ordinary skill in the art within the scope of information available through public channels and in combination with the technical inspiration provided by the present application documents are still within the scope of protection of the present application.

Claims

1. A bearing sealing structure, characterized in that: The invention comprises a mounting base and a rotating shaft (3), wherein a bearing hole is provided on the mounting base, a working bearing (4), a first sealing ring (5) and a second sealing ring (6) are sleeved on the rotating shaft (3), the working bearing (4), the first sealing ring (5) and the second sealing ring (6) are all arranged in the bearing hole, the first sealing ring (5) and the second sealing ring (6) are located on the same side of the working bearing (4), and a buffer cavity (7) is provided between the first sealing ring (5) and the second sealing ring (6); an impurity discharge channel (8) is provided in the mounting base, one end of the impurity discharge channel (8) extends obliquely upward and is communicated with the buffer cavity (7), and the other end of the impurity discharge channel (8) is communicated with the outside of the mounting base.

2. The bearing sealing structure according to claim 1, characterized in that: The bearing hole comprises a first hole section (9), a second hole section (10) and a third hole section (11) which are arranged in sequence along the axial direction and whose diameters decrease in sequence. The working bearing (4) is arranged in the first hole section (9), the first sealing ring (5) and the second sealing ring (6) are both arranged in the second hole section (10), and the third hole section (11) and the rotating shaft (3) are clearance-fitted.

3. The bearing sealing structure according to claim 2, characterized in that: The mounting base comprises a housing (1) and a bearing end cover (2); a mounting hole is provided on the housing (1); the bearing end cover (2) extends into the mounting hole and is fixedly connected to the housing (1); and the bearing hole is located in the end cover.

4. The bearing sealing structure according to claim 3, characterized in that: The impurity discharge channel (8) comprises a first through hole (81) provided in the housing (1) and a second through hole (82) provided in the bearing end cover (2); the first end of the second through hole (82) is inclined along the direction from the working bearing (4) to the first sealing ring (5) and extends to the buffer cavity (7); the second end of the second through hole (82) extends to the outer peripheral surface of the bearing end cover (2); the first end of the first through hole (81) extends to the inner wall of the mounting hole of the housing (1) and is connected to the second end of the second through hole (82); the second end of the first through hole (81) extends to the outside of the housing (1); and the first through hole (81) is perpendicular to the mounting hole of the housing (1).

5. The bearing sealing structure according to claim 3, characterized in that: The end of the bearing end cover (2) facing the outside of the housing (1) is provided with an outer flange structure, and the end of the mounting hole facing the outside of the housing (1) is provided with a limiting step (13), and the outer flange structure is fitted with the limiting step (13) and connected by screws.

6. The bearing sealing structure according to claim 5, characterized in that: The outer periphery of the bearing end cover (2) is also provided with a sealing groove, in which an O-shaped sealing ring (12) is provided. The O-shaped sealing ring (12) is in sealing contact with the inner wall of the mounting hole of the housing (1); the sealing groove and the O-shaped sealing ring (12) are located on a side of the second through hole (82) close to the working bearing (4).

7. The bearing sealing structure according to claim 6, characterized in that: Variable diameter steps (14) are provided on the outer periphery of the bearing end cover (2) and the inner wall of the mounting hole in correspondence with each other, the sealing groove and the O-ring (12) are located on the small diameter side of the variable diameter step (14), and the second end of the second through hole (82) is located on the large diameter side of the variable diameter step (14).

8. A grain unloading gear box, comprising a gear box body, wherein an input shaft (20) and an output shaft (21) are rotatably mounted in the gear box body, characterized in that: The gearbox body is further provided with a bearing sealing structure according to any one of claims 1 to 7, wherein the input shaft (20) or the output shaft (21) is the rotating shaft (3) of the bearing sealing structure.

9. The grain unloading gear box according to claim 8, characterized in that: The output shaft (21) is the rotating shaft (3) of the bearing sealing structure; the output shaft (21) is arranged vertically, the lower end of the output shaft (21) is connected to the mounting base through a tapered roller bearing, and the input shaft (20) and the output shaft (21) are connected through a bevel gear pair.

10. A harvester, comprising a harvester body, characterized in that: The grain unloading gear box according to claim 8 or 9 is installed on the harvester body.

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