Sealing structure for cutter shaft

Abstract

The utility model relates to the technical field of sealing of cutter shafts, and discloses a sealing structure for a cutter shaft, which comprises a cutter shaft body, outer bearing glands are symmetrically arranged at two ends of the cutter shaft body, inner bearing glands are arranged at positions, corresponding to the outer bearing glands, of two ends of the cutter shaft body, and the inner bearing glands are clamped into the outer bearing glands. An outer groove is formed in the inner side edge of the outer bearing gland. The sealing performance for preventing oil leakage is improved through the oil seal and the first sealing ring, impurities are prevented from further moving towards the position of the inner groove through the dust discharging opening, the dust discharging effect is achieved, the gap between the outer protruding block and the outer groove is filled with the asbestos packing, external impurities are prevented from entering, and the sealing performance is improved. The inclined inverted pieces on the two side faces of the second sealing ring can block impurities, so that the impurities are prevented from entering the oil seal, the dust permeation speed is reduced through the multiple layers of inclined inverted pieces, the sealing performance for preventing the impurities from entering is integrally improved, and the rotary blade replacement convenience is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of knife shaft sealing, in particular to a sealing structure for a knife shaft. Background Art

[0002] The rotary tiller is used in an environment with mud, sand, water and grass. The oil seal on the rotary tiller shaft is easily invalidated due to the blockage of mud and sand and the entanglement of grass, which seriously affects the service life of the bearing.

[0003] According to the search, Chinese patent literature, announcement number: CN211297585U, discloses a knife shaft sealing structure. The utility model adopts a sealing method of asbestos packing compression, which can effectively block mud from entering the bearing seat, thereby preventing mud from damaging the oil seal and causing oil leakage. However, the device still has defects during use. It does not have a structure for discharging debris. It is inevitable that the asbestos packing will be damaged during long-term use. Some debris will enter the oil seal through the gap and cause friction with it to cause damage. In addition, the structure only uses a single-layer sealing structure, and the sealing effect is poor. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the utility model provides a sealing structure for a knife shaft, which has the advantages of improving the sealing performance against oil leakage through an oil seal and a first sealing ring, preventing impurities from further moving to the position of the inner groove through a dust exhaust opening, thereby playing a role in dust exhaust, and filling the gap between the outer protrusion and the outer groove with asbestos packing to prevent external impurities from entering, while the inclined sheets on both sides of the second sealing ring will block impurities, thereby preventing impurities from entering the oil seal, and the speed of dust infiltration is slowed down by multiple layers of inclined sheets, thereby improving the sealing performance against impurities entering as a whole, and improving the convenience of replacing the rotary blade.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a sealing structure for a knife shaft, comprising a knife shaft body, outer bearing glands are symmetrically arranged at both ends of the knife shaft body, and inner bearing glands are arranged at the positions of the two ends of the knife shaft body corresponding to the outer bearing glands;

[0008] The inner bearing cover is inserted into the inner part of the outer bearing cover, the inner side of the outer bearing cover is provided with an outer groove, and the inner part of the outer bearing cover is provided with an inner groove at a position corresponding to the outer groove.

[0009] Preferably, oil seals are provided at the positions of the outer bearing cover and the inner bearing cover at both ends of the cutter shaft body, and first sealing rings are provided at the positions of the oil seals at both ends of the cutter shaft body.

[0010] Through the above technical solution, when the cutter shaft body rotates, the oil penetrates into the oil seal edge and the cutter shaft body through the pressure of the lubricating oil to form an extremely thin oil film. The oil film is prevented from overflowing and leaking due to the surface tension of the oil. If the oil seal is damaged, the first sealing ring is used for backup sealing, thereby improving the sealing performance against oil leakage.

[0011] Preferably, a plurality of dust exhaust openings are arranged at equal intervals on the side surface of the outer bearing cover corresponding to the position of the outer groove, and the inner diameter of the dust exhaust opening is smaller than the inner diameter of the outer groove.

[0012] Through the above technical solution, when the asbestos packing is damaged, impurities enter the interior of the outer groove from the gap, and are driven by vibration to be discharged from the dust exhaust opening, thereby preventing the impurities from further moving to the position of the inner groove, thereby achieving the dust exhaust effect.

[0013] Preferably, an outer protrusion is provided on the side surface of the inner bearing gland at a position corresponding to the outer groove, an asbestos packing is provided at one end of the outer protrusion, and the outer protrusion is inserted into the inner part of the outer groove.

[0014] Through the above technical solution, the gap between the outer protrusion and the outer groove is filled with asbestos packing to prevent external impurities from entering, and the outer diameter of the asbestos packing is larger than the inner diameter of the dust exhaust opening, so the dust exhaust opening does not affect the sealing effect of the asbestos packing.

[0015] Preferably, a second sealing ring is provided on the side surface of the inner bearing cover at a position corresponding to the inner groove, and a plurality of inclined plates are symmetrically provided at equal intervals on both sides of the second sealing ring, and the second sealing ring is inserted into the inner groove.

[0016] Through the above technical solution, when impurities enter the inner groove, the impurities are blocked by the inclined plates on both sides of the second sealing ring, thereby preventing the impurities from entering the oil seal, and the speed of dust penetration is slowed down by the multiple layers of inclined plates.

[0017] Preferably, a connecting ring is welded to the side of the outer bearing cover, and a fixing hole is arranged on the side of the connecting ring in a rectangular shape.

[0018] Through the above technical solution, when personnel need to install the knife shaft body, they need to install it at the designated position after passing the bolt through the fixing hole. The structure is simple, the installation is convenient, and the practicality is improved.

[0019] Preferably, a plurality of connection plates are welded around the blade shaft body, and three rotary tilling knives are arranged at equal intervals on the side of the connection plate, and the rotary tilling knives are fixed to the connection plate by bolts.

[0020] Through the above technical solution, when personnel need to replace a damaged rotary tiller blade, they only need to remove the bolts that fix the rotary tiller blade to the connecting plate to remove it, and then fix the new rotary tiller blade to the connecting plate with the bolts to complete the replacement, thereby improving the convenience of replacing the rotary tiller blade.

[0021] Compared with the prior art, the utility model provides a sealing structure for a knife shaft, which has the following beneficial effects:

[0022] 1. In the utility model, when the blade shaft body rotates, the oil penetrates into the oil seal cutting edge and the blade shaft body through the pressure of the lubricating oil to form an extremely thin oil film. The oil film is prevented from overflowing due to the surface tension of the oil, and the oil is prevented from leaking. If the oil seal is damaged, the first sealing ring is used for backup sealing, thereby improving the sealing performance against oil leakage. When the asbestos packing is damaged, impurities enter the interior of the outer groove from the gap, and the impurities are driven by vibration to be discharged from the dust exhaust opening, thereby preventing the impurities from further moving to the position of the inner groove, thereby playing a role in dust removal. The asbestos packing is used to fill the gap between the outer protrusion and the outer groove, thereby preventing external impurities from entering, and the outer diameter of the asbestos packing is larger than the inner diameter of the dust exhaust opening, so the dust exhaust opening does not affect the sealing effect of the asbestos packing.

[0023] 2. When impurities enter the inner groove of the utility model, the impurities are blocked by the inclined plates on both sides of the second sealing ring, thereby preventing the impurities from entering the oil seal. The speed of dust penetration is slowed down by the multi-layer inclined plates. When personnel need to install the knife shaft body, they need to install it in the designated position after passing the bolts through the fixing holes. The structure is simple, the installation is convenient, and the practicality is improved. When personnel need to replace the damaged rotary tiller blade, they only need to remove the bolts fixing the rotary tiller blade to the connecting plate to remove it, and then fix the new rotary tiller blade to the connecting plate by bolts to complete the replacement, which improves the convenience of replacing the rotary tiller blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0025] Figure 2 This is a schematic diagram of the three-dimensional structure of the rotary tiller blade of the utility model;

[0026] Figure 3 This is a schematic diagram of the planar cross-sectional structure of the outer bearing gland of the utility model;

[0027] Figure 4 For this utility model Figure 3 Enlarged view of point A in the middle.

[0028] Among them: 1. Cutter shaft body; 2. Connecting plate; 3. Rotary tiller; 4. Outer bearing gland; 5. Oil seal; 6. First sealing ring; 7. Inner bearing gland; 8. Outer groove; 9. Dust discharge opening; 10. Inner groove; 11. Outer protrusion; 12. Asbestos packing; 13. Second sealing ring; 14. Oblique inverted piece; 15. Connecting ring; 16. Fixing hole. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. 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 creative work are within the scope of protection of the utility model.

[0030] Embodiment 1:

[0031] like Figure 1-4 As shown, the utility model provides a sealing structure for a knife shaft, comprising a knife shaft body 1, outer bearing glands 4 are symmetrically arranged at both ends of the knife shaft body 1, and inner bearing glands 7 are arranged at the positions of the outer bearing glands 4 at both ends of the knife shaft body 1;

[0032] The inner bearing cover 7 is inserted into the inner side of the outer bearing cover 4 . An outer groove 8 is provided on the inner side of the outer bearing cover 4 . An inner groove 10 is provided at a position corresponding to the outer groove 8 inside the outer bearing cover 4 .

[0033] Specifically, oil seals 5 are provided at the positions of the outer bearing gland 4 and the inner bearing gland 7 at both ends of the blade shaft body 1, and first sealing rings 6 are provided at the positions of the oil seals 5 at both ends of the blade shaft body 1. The advantage is that when the blade shaft body 1 rotates, the oil penetrates into the cutting edge of the oil seal 5 and the blade shaft body 1 through the pressure of the lubricating oil to form a very thin layer of oil film, and the oil film is prevented from overflowing and leaking due to the surface tension of the oil. If the oil seal 5 is damaged, the first sealing ring 6 is used for backup sealing, thereby improving the sealing performance against oil leakage.

[0034] Specifically, a plurality of dust discharge openings 9 are arranged at equal intervals on the side of the outer bearing gland 4 corresponding to the position of the outer groove 8, and the inner diameter of the dust discharge opening 9 is smaller than the inner diameter of the outer groove 8. The advantage is that when the asbestos packing 12 is damaged, impurities enter the inner part of the outer groove 8 from the gap, and the impurities are driven by vibration to be discharged from the dust discharge opening 9, thereby preventing the impurities from further moving to the position of the inner groove 10, and playing a role in dust discharge.

[0035] Specifically, an outer convex block 11 is arranged at a position corresponding to the outer groove 8 on the side of the inner bearing gland 7, and an asbestos packing 12 is arranged at one end of the outer convex block 11, and the outer convex block 11 is inserted into the inner part of the outer groove 8. The advantage is that the gap between the outer convex block 11 and the outer groove 8 is filled with the asbestos packing 12, thereby preventing external impurities from entering, and the outer diameter of the asbestos packing 12 is larger than the inner diameter of the dust exhaust opening 9, so the dust exhaust opening 9 does not affect the sealing effect of the asbestos packing 12.

[0036] Embodiment 2:

[0037] like Figure 1-4 As shown, as an improvement to the previous embodiment. Specifically, a second sealing ring 13 is arranged at the position of the inner groove 10 on the side of the inner bearing gland 7, and a plurality of inclined plates 14 are symmetrically arranged at equal intervals on both sides of the second sealing ring 13, and the second sealing ring 13 is inserted into the inner groove 10. The advantage is that when impurities enter the inner groove 10, the inclined plates 14 on both sides of the second sealing ring 13 block the impurities, thereby preventing the impurities from entering the oil seal 5, and the multi-layer inclined plates 14 slow down the speed of dust penetration.

[0038] Specifically, a connecting ring 15 is welded to the side of the outer bearing gland 4, and a fixing hole 16 is arranged on the side of the connecting ring 15 in a rectangular shape. The advantage is that when personnel need to install the cutter shaft body 1, they only need to pass the bolts through the fixing hole 16 and then install it in the designated position, which has a simple structure, convenient installation, and improved practicality.

[0039] Specifically, a plurality of connecting plates 2 are welded around the blade shaft body 1, and three rotary tilling blades 3 are arranged at equal intervals on the side of the connecting plate 2, and the rotary tilling blades 3 are fixed to the connecting plate 2 by bolts. The advantage is that when personnel need to replace the damaged rotary tilling blade 3, they only need to remove the bolts fixing the rotary tilling blade 3 to the connecting plate 2 to remove it, and then fix the new rotary tilling blade 3 to the connecting plate 2 by bolts to complete the replacement, thereby improving the convenience of replacing the rotary tilling blade 3.

[0040] When in use, when the blade shaft body 1 rotates, the oil penetrates into the cutting edge of the oil seal 5 and the blade shaft body 1 through the pressure of the lubricating oil to form a very thin oil film. The oil film is prevented from overflowing by the surface tension of the oil, and the oil is prevented from leaking. If the oil seal 5 is damaged, the first sealing ring 6 is used for backup sealing, thereby improving the sealing performance against oil leakage. The outer diameter of the asbestos packing 12 is larger than the inner diameter of the dust exhaust opening 9, so the asbestos packing 12 will block external impurities. When the asbestos packing 12 is damaged, the impurities enter the inner part of the outer groove 8 from the gap, and the impurities are sucked out by the vibration. Impurities will be discharged from the dust exhaust opening 9. When impurities enter the inner groove 10, the impurities are blocked by the inclined plates 14 on both sides of the second sealing ring 13, thereby preventing the impurities from entering the oil seal 5. The multi-layer inclined plates 14 slow down the speed of dust infiltration and improve the overall sealing performance against the entry of impurities. When personnel need to replace the damaged rotary tiller 3, they only need to remove the bolts fixing the rotary tiller 3 to the connecting plate 2 to remove it, and then fix the new rotary tiller 3 to the connecting plate 2 with bolts to complete the replacement, thereby completing the use of the device.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sealing structure for a knife shaft, comprising a knife shaft body (1), characterized in that: Outer bearing covers (4) are symmetrically arranged at both ends of the knife shaft body (1), and inner bearing covers (7) are arranged at positions corresponding to the outer bearing covers (4) at both ends of the knife shaft body (1); The inner bearing cover (7) is inserted into the inner part of the outer bearing cover (4); an outer groove (8) is arranged on the inner side of the outer bearing cover (4); and an inner groove (10) is arranged at a position corresponding to the outer groove (8) inside the outer bearing cover (4).

2. A sealing structure for a knife shaft according to claim 1, characterized in that: Oil seals (5) are provided at positions corresponding to the outer bearing cover (4) and the inner bearing cover (7) at both ends of the blade shaft body (1), and first sealing rings (6) are provided at positions corresponding to the oil seals (5) at both ends of the blade shaft body (1).

3. The sealing structure for a knife shaft according to claim 1, characterized in that: A plurality of dust exhaust openings (9) are arranged at equal intervals on the side surface of the outer bearing pressure cover (4) at positions corresponding to the outer groove (8), and the inner diameter of the dust exhaust opening (9) is smaller than the inner diameter of the outer groove (8).

4. The sealing structure for a knife shaft according to claim 1, characterized in that: An outer convex block (11) is arranged on the side surface of the inner bearing cover (7) at a position corresponding to the outer groove (8), an asbestos packing (12) is arranged at one end of the outer convex block (11), and the outer convex block (11) is inserted into the inner part of the outer groove (8).

5. The sealing structure for a knife shaft according to claim 1, characterized in that: A second sealing ring (13) is arranged on the side of the inner bearing cover (7) at a position corresponding to the inner groove (10), and a plurality of inclined plates (14) are symmetrically arranged at equal intervals on the two sides of the second sealing ring (13), and the second sealing ring (13) is inserted into the inner groove (10).

6. A sealing structure for a knife shaft according to claim 1, characterized in that: A connecting ring (15) is welded to the side of the outer bearing cover (4), and a fixing hole (16) is arranged on the side of the connecting ring (15) in a rectangular shape.

7. A sealing structure for a knife shaft according to claim 1, characterized in that: A plurality of connecting plates (2) are welded around the blade shaft body (1), and three rotary tilling knives (3) are arranged at equal intervals on the side of the connecting plate (2). The rotary tilling knives (3) are fixed to the connecting plate (2) by bolts.

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