A kind of water-proof and dust-proof sealing device for carrier roller bearing box

Abstract

The application discloses a kind of waterproof dustproof sealing devices of carrier roller bearing box, it includes roller body and the rotating shaft being passed in the inside of roller body, the end of roller body and rotating shaft located same side is all connected by bearing box sealing, roller body is fixedly connected with bearing box sealing, rotating shaft gap penetrates bearing box, bearing box includes installation slot, the bottom of installation slot is provided with bearing, bearing is sleeved on rotating shaft, dynamic sealing mechanism for dynamic sealing the inner cavity of roller body is also provided in installation slot;The present scheme can realize the dynamic sealing of bearing box, play the multiple sealing effect of waterproof, dustproof and gas prevention, and the sealing effect is good, not easy to fail, reduce later maintenance cost, to ensure the normal operation of carrier roller.

Description

Technical Field

[0001] This invention relates to the field of roller bearing sealing technology, specifically to a waterproof and dustproof sealing device for roller bearing housings. Background Technology

[0002] The idler bearing housing is a major component of belt conveyor idlers. Existing idler bearing housings primarily use either labyrinth seals or single-lip skeleton oil seals with varying sealing structures. Because labyrinth seal components rotate relative to each other, gaps exist between the labyrinth seal parts, allowing water to slowly enter the idler's inner cavity. Secondly, the bushing and shaft use a clearance fit, and the bushing is directly limited in the axial direction by fasteners connected to the shaft. When the idler is operating, water may enter through the gap between the fastener and the shaft, and then through the gap between the bushing and the shaft into the inner cavity. While single-lip oil seals offer some sealing performance, continuous operation in dusty environments can easily damage the oil seal lip, leading to sealing failure. Water can then slowly enter the idler bearing and inner cavity through the gap between the lip and the shaft. Therefore, the existing idler bearing housing sealing structures lack sufficient waterproofing, resulting in a shortened idler service life and even affecting the idler's normal operating efficiency. Summary of the Invention

[0003] To address the aforementioned shortcomings of the prior art, this invention provides a waterproof and dustproof sealing device for idler roller bearing boxes, which solves the problems of poor sealing performance and short service life of idler roller bearing boxes.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A waterproof and dustproof sealing device for a roller bearing housing is provided, comprising a roller body and a rotating shaft passing through the inside of the roller body. The ends of the roller body and the rotating shaft on the same side are sealed and connected by the bearing housing. The roller body and the bearing housing are fixedly sealed and connected. The rotating shaft passes through the bearing housing. The bearing housing includes a mounting groove. A bearing is provided at the bottom of the mounting groove and is sleeved on the rotating shaft. A dynamic sealing mechanism for dynamically sealing the inner cavity of the roller body is also provided in the mounting groove.

[0006] Furthermore, the dynamic sealing mechanism includes a first annular rubber sleeve disposed on the outer end of the bearing, the outer surface of the first annular rubber sleeve being sealed and fitted with the inner surface of the mounting groove, a skeleton-type second annular rubber sleeve disposed on the outer end of the first annular rubber sleeve, the inner surface of the skeleton-type second annular rubber sleeve being sealed and fitted with the outer surface of the rotating shaft, and a rotational contact seal being disposed between the first annular rubber sleeve and the skeleton-type second annular rubber sleeve.

[0007] The beneficial effects of adopting the above technical solution are as follows: Under the combined action of the first annular rubber sleeve and the skeleton-type second annular rubber sleeve, external water can only seep into the inner cavity of the roller body through the gap between the first annular rubber sleeve and the skeleton-type second annular rubber sleeve. When the roller body is rotating, the roller body can drive the bearing box and the first annular rubber sleeve to rotate synchronously under the action of the bearing, while the rotating shaft and the skeleton-type second annular rubber sleeve remain stationary. By rotating the contact seal, a dynamic seal can be formed at the gap between the two.

[0008] Furthermore, the rotating contact seal includes a first sealing ring and a second sealing ring respectively embedded in the near ends of the first annular rubber sleeve and the skeleton-type second annular rubber sleeve. The near ends of the first sealing ring and the second sealing ring rotate in contact and form an annular rotating sealing surface to achieve sealing contact between the dynamic component and the static component, and to completely isolate the bearing and roller inner cavity from the outside.

[0009] Furthermore, several concentric annular oil grooves are provided on the contact surfaces of the first sealing ring and the second sealing ring, and the several annular oil grooves on the first sealing ring and the second sealing ring correspond one-to-one and fit tightly together to form several annular cavities, and the several annular cavities are filled with grease; the grease can penetrate into the annular rotating sealing surface and lubricate it, thereby reducing the rotational friction of the contact surfaces of the first sealing ring and the second sealing ring and the wear of the first sealing ring and the second sealing ring.

[0010] Furthermore, the outer end of the skeleton-type second annular rubber sleeve is provided with a spring-loaded component for tensioning the skeleton-type second annular rubber sleeve, and the outer end of the spring-loaded component is provided with a skeleton-type rubber pressure cap sleeved on the rotating shaft.

[0011] The beneficial effects of adopting the above technical solution are as follows: under the elastic thrust of the spring-loaded component, the contact surfaces of the first sealing ring and the second sealing ring can always maintain close contact, thereby achieving a good dynamic sealing effect.

[0012] Furthermore, both the outer end of the skeleton-type rubber cap and the outer end of the bearing are abutted by a retaining ring, and an annular groove for fixing the retaining ring is provided on the rotating shaft; wherein the retaining ring serves to limit the skeleton-type rubber cap and the bearing, and prevents the skeleton-type rubber cap and the bearing from axial displacement.

[0013] Furthermore, the outer surface of the skeleton-type rubber cap and the outer surface of the skeleton-type second annular rubber sleeve are provided with corrugated dustproof surfaces that are clearance-fitted with the inner surface of the mounting groove to prevent dust from entering the mounting groove.

[0014] Furthermore, the outer surface of the first annular rubber sleeve and the inner surface of the skeleton-type second annular rubber sleeve are provided with corrugated sealing surfaces that are respectively interference-fitted with the inner surface of the mounting groove and the outer surface of the rotating shaft; by utilizing the flexibility of rubber and the radial contraction and axial expansion characteristics of the corrugated sealing surface, a good static sealing effect is achieved.

[0015] Furthermore, an annular boss is provided on the inner end of the first annular rubber sleeve, and the annular boss abuts against the outer end of the outer circle of the bearing to prevent the rotating first annular rubber sleeve from contacting and rubbing against the stationary inner circle of the bearing.

[0016] Furthermore, the outer side of the bearing housing is interference-fitted with the inner side of the roller body, and a protruding ridge is provided on the outer side of the bearing housing, while an annular anti-reverse groove that mates with the protruding ridge is provided on the inner side of the roller body; in order to achieve a fixed and sealed connection between the roller body and the bearing housing.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. This solution achieves sealing contact between dynamic and static components through the annular rotating sealing surface formed by the rotational contact of the first and second sealing rings. At the same time, under the elastic thrust of the spring-loaded component, the annular rotating sealing surface has a good sealing effect. Combined with the corrugated sealing surface and the corrugated dustproof surface, it achieves waterproof and dustproof protection for the entire inner cavity of the bearing box and roller body, thereby extending the service life of the bearing and roller body.

[0019] 2. When the roller drives the bearing box, the first annular rubber sleeve and the first sealing ring to rotate on the bearing, it can drive the air flow in the sealed space of the mounting groove and generate wind pressure, so that the air in the sealed space generates a positive pressure greater than the external atmospheric pressure, thereby preventing external dust and moisture from entering the sealed space of the mounting groove, and achieving the purpose of further enhancing the sealing performance of the bearing box. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the waterproof and dustproof sealing device for the idler roller bearing box.

[0021] Figure 2 for Figure 1 A magnified view of region A in the middle.

[0022] Figure 3 for Figure 2 A magnified view of region B in the middle.

[0023] Among them, 1. Roller body, 2. Rotating shaft, 3. Bearing box, 4. Mounting groove, 5. Bearing, 6. First annular rubber sleeve, 7. Second annular rubber sleeve with skeleton, 8. First sealing ring, 9. Second sealing ring, 10. Annular rotating sealing surface, 11. Annular cavity, 12. Spring compression element, 13. Rubber gland with skeleton, 14. Retaining ring, 15. Annular groove, 16. Corrugated dustproof surface, 17. Corrugated sealing surface, 18. Annular boss, 19. Raised ridge, 20. Annular anti-reverse groove, 21. Steel skeleton. Detailed Implementation

[0024] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0025] like Figures 1 to 3 As shown, the waterproof and dustproof sealing device for the idler roller bearing box in this solution includes a roller body 1 and a rotating shaft 2 passing through the inside of the roller body 1. The ends of the roller body 1 and the rotating shaft 2 located on the same side are sealed and connected by a bearing box 3. The roller body 1 and the bearing box 3 are fixedly and sealed. In the design, the outer side of the bearing box 3 is interference-fitted with the inner side of the roller body 1, and a protruding ridge 19 is provided on the outer side of the bearing box 3. An annular anti-return groove 20 that cooperates with the protruding ridge 19 is provided on the inner side of the roller body 1 to achieve a fixed and sealed connection between the roller body 1 and the bearing box 3.

[0026] The shaft 2 passes through the bearing housing 3. The bearing housing 3 includes a mounting groove 4. A bearing 5 is installed at the bottom of the mounting groove 4 and is fixedly sleeved on the shaft 2. A dynamic sealing mechanism is also installed in the mounting groove 4. The dynamic sealing mechanism includes a first annular rubber sleeve 6 installed at the outer end of the bearing 5 and a second annular rubber sleeve 7 with a skeleton at the outer end of the first annular rubber sleeve 6. Corrugated sealing surfaces 17 are provided on the outer surface of the first annular rubber sleeve 6 and the inner surface of the second annular rubber sleeve 7 with a skeleton, respectively, which are interference-fitted with the inner surface of the mounting groove 4 and the outer surface of the shaft 2. By utilizing the flexibility of rubber and the radial contraction and axial expansion characteristics of the corrugated sealing surface 17, static sealing is achieved between the first annular rubber sleeve 6 and the mounting groove 4, and between the second annular rubber sleeve 7 with a skeleton and the shaft 2, and the sealing effect is good.

[0027] A rotating contact seal is provided between the first annular rubber sleeve 6 and the skeleton-type second annular rubber sleeve 7. The rotating contact seal includes a first sealing ring 8 and a second sealing ring 9 respectively embedded in the near ends of the first annular rubber sleeve 6 and the skeleton-type second annular rubber sleeve 7. The near ends of the first sealing ring 8 and the second sealing ring 9 rotate in contact and form an annular rotating sealing surface 10.

[0028] Preferably, the first sealing ring 8 and the second sealing ring 9 are made of materials such as silicon carbide ceramic, which gives them excellent high-temperature mechanical properties, as well as oxidation resistance, corrosion resistance, and wear resistance, while also having a low coefficient of friction.

[0029] This design, through the combined action of the first annular rubber sleeve 6 and the skeletonized second annular rubber sleeve 7, ensures that external water can only seep into the inner cavity of the roller body 1 through the gap between the first annular rubber sleeve 6 and the skeletonized second annular rubber sleeve 7. When the roller body 1 rotates, it drives the bearing housing 3 and the first annular rubber sleeve 6 to rotate synchronously under the action of the bearing 5, while the rotating shaft 2 and the skeletonized second annular rubber sleeve 7 remain stationary. The annular rotating sealing surface 10 enables sealed contact between the dynamic and static components, completely isolating the bearing 5 and the inner cavity of the roller body 1 from the outside. Simultaneously, when the roller body 1 drives the bearing housing 3, the first annular rubber sleeve 6, and the first sealing ring 8 to rotate on the bearing 5, it drives the airflow in the sealed space of the mounting groove 4 and generates wind pressure, causing the air in the sealed space to generate a positive pressure greater than the external atmospheric pressure. This prevents external dust and moisture from entering the sealed space of the mounting groove 4, further enhancing the sealing performance of the bearing housing 3.

[0030] In the design, two concentric annular oil grooves are opened on the contact surfaces of the first sealing ring 8 and the second sealing ring 9. The two annular oil grooves on the first sealing ring 8 and the two annular oil grooves on the second sealing ring 9 correspond one-to-one and connect with each other to form two annular cavities 11. The two annular cavities 11 are filled with grease, which can penetrate into the annular rotating sealing surface 10 and lubricate it, thereby reducing the rotational friction of the contact surfaces of the first sealing ring 8 and the second sealing ring 9 and the wear of the first sealing ring 8 and the second sealing ring 9.

[0031] The outer end of the skeleton-type second annular rubber sleeve 7 is provided with a spring-loaded member 12 for compressing the skeleton-type second annular rubber sleeve 7. Under the elastic thrust of the spring-loaded member 12, the contact surfaces of the first sealing ring 8 and the second sealing ring 9 can always maintain tight contact, thereby achieving a good dynamic sealing effect. The outer end of the spring-loaded member 12 is provided with a skeleton-type rubber cap 13 sleeved on the rotating shaft 2. The outer end of the skeleton-type rubber cap 13 and the outer end of the bearing 5 are both abutted by a retaining ring 14. The rotating shaft 2 is provided with an annular groove 15 for fixing and installing the retaining ring 14. The retaining ring 14 plays the role of limiting the skeleton-type rubber cap 13 and the bearing 5, preventing the skeleton-type rubber cap 13 and the bearing 5 from axial displacement.

[0032] Preferably, both the skeleton-type rubber cap 13 and the skeleton-type second annular rubber sleeve 7 are adhesive parts made of stamped steel skeleton and rubber. The steel skeleton 21 on the skeleton-type rubber cap 13 is located at its inner end, while the steel skeleton 21 on the skeleton-type second annular rubber sleeve 7 is located at its outer end, so as to stabilize the spring-loaded member 12 and stably transmit the elastic thrust of the spring-loaded member 12 to the second sealing ring 9.

[0033] The outer surface of the skeleton-type rubber cap 13 and the outer surface of the skeleton-type second annular rubber sleeve 7 are provided with corrugated dustproof surfaces 16 that are clearance-fitted with the inner surface of the mounting groove 4 to prevent dust from entering the mounting groove 4; the inner end of the first annular rubber sleeve 6 is provided with an annular boss 18, which abuts against the outer end of the outer circle of the bearing 5 to prevent the rotating first annular rubber sleeve 6 from contacting and rubbing against the stationary inner circle of the bearing 5.

[0034] In summary, this solution features a compact structure, ingenious design, and low manufacturing cost. It can achieve dynamic sealing of the bearing housing 3, providing multiple sealing effects such as waterproofing, dustproofing, and gas protection. The sealing effect is excellent and not prone to failure, reducing subsequent maintenance costs and ensuring the normal operation of the idler roller.

Claims

1. A waterproof and dustproof sealing device for a roller bearing housing, comprising a roller body (1) and a rotating shaft (2) passing through the inside of the roller body (1), characterized in that, The ends of the roller body (1) and the rotating shaft (2) located on the same side are sealed and connected by a bearing box (3). The roller body (1) and the bearing box (3) are fixedly sealed and connected. The rotating shaft (2) passes through the bearing box (3) with a gap. The bearing box (3) includes a mounting groove (4). A bearing (5) is provided at the bottom of the mounting groove (4). The bearing (5) is sleeved on the rotating shaft (2). A dynamic sealing mechanism for dynamically sealing the inner cavity of the roller body (1) is also provided in the mounting groove (4). The dynamic sealing mechanism includes a first annular rubber sleeve (6) disposed on the outer end of the bearing (5), the outer side of the first annular rubber sleeve (6) being sealed and fitted with the inner side of the mounting groove (4), a skeleton-type second annular rubber sleeve (7) being disposed on the outer end of the first annular rubber sleeve (6), the inner side of the skeleton-type second annular rubber sleeve (7) being sealed and fitted with the outer side of the rotating shaft (2), and a rotational contact seal being disposed between the first annular rubber sleeve (6) and the skeleton-type second annular rubber sleeve (7); The rotating contact seal includes a first sealing ring (8) and a second sealing ring (9) respectively embedded in the near ends of the first annular rubber sleeve (6) and the skeleton-type second annular rubber sleeve (7). The near ends of the first sealing ring (8) and the second sealing ring (9) rotate in contact and form an annular rotating sealing surface (10). The outer end of the skeleton-type second annular rubber sleeve (7) is provided with a spring-loaded component (12) for tensioning the skeleton-type second annular rubber sleeve (7), and the outer end of the spring-loaded component (12) is provided with a skeleton-type rubber cap (13) sleeved on the rotating shaft (2). The outer side of the skeleton-type rubber cap (13) and the outer side of the skeleton-type second annular rubber sleeve (7) are provided with corrugated dustproof surfaces (16) that are clearance-fitted with the inner side of the mounting groove (4); the outer side of the first annular rubber sleeve (6) and the inner side of the skeleton-type second annular rubber sleeve (7) are provided with corrugated sealing surfaces (17) that are interference-fitted with the inner side of the mounting groove (4) and the outer side of the rotating shaft (2), respectively.

2. The waterproof and dustproof sealing device for the idler roller bearing housing according to claim 1, characterized in that, The first sealing ring (8) and the second sealing ring (9) are provided with a number of concentric annular oil grooves, and the number of annular oil grooves on the first sealing ring (8) and the second sealing ring (9) correspond one to one and connect with each other to form a number of annular cavities (11), and the number of annular cavities (11) are filled with grease.

3. The waterproof and dustproof sealing device for the idler roller bearing housing according to claim 1, characterized in that, The outer end of the frame-type rubber cap (13) and the outer end of the bearing (5) are both abutted by a retaining ring (14), and an annular groove (15) for fixing the retaining ring (14) is provided on the rotating shaft (2).

4. The waterproof and dustproof sealing device for the idler roller bearing housing according to claim 1, characterized in that, The inner end of the first annular rubber sleeve (6) is provided with an annular boss (18), which abuts against the outer end of the outer circle of the bearing (5).

5. The waterproof and dustproof sealing device for the idler roller bearing housing according to claim 1, characterized in that, The outer side of the bearing housing (3) is interference-fitted with the inner side of the roller body (1), and a protruding ridge (19) is provided on the outer side of the bearing housing (3), and an annular anti-reverse groove (20) that cooperates with the protruding ridge (19) is provided on the inner side of the roller body (1).

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