A roll end sealing device incorporating unsaturated fatty amides

Abstract

The utility model discloses a kind of roll end sealing devices of unsaturated fatty amide doping, including rubber fixed part, sealing lip part and the skeleton part between the two, the inner end surface of the sealing lip part has the first sealing lip in medium side and the second sealing lip and third sealing lip in air side, wherein the first sealing lip is contacted with shaft body surface, the second sealing lip and third sealing lip form non-contact gap between the shaft body, the first sealing lip is doped with oleic acid amide material, for forming grease film on its lip surface.The design scheme presented by the utility model, multiple groups of lip body are integrated on sealing lip part with the contact and non-contact of shaft body, while doping oleic acid amide in the lip body contacted with shaft body, extremely thin lubricating oil film can be formed when using, can satisfy under the working condition of high speed, grease lubrication, simultaneously solve the lubrication, cooling, anti-pollution and anti-leakage problem of sealing lip.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical seal technology, specifically a roller end sealing device doped with unsaturated fatty amide. Background Technology

[0002] As the roller speed of roller presses continues to increase, higher demands are placed on the stability and lifespan of roller end sealing devices. Currently, the sealing technology in this field mainly adopts the following two solutions:

[0003] 1. Contact-type lip seals: These seals rely on close contact between the sealing lip and the shaft surface to achieve a seal. However, the bearing housing is lubricated with grease, resulting in insufficient lubrication of the sealing lip and difficulty in forming an effective hydrodynamic oil film. When the operating conditions of the equipment (such as linear speed, dry operation) change significantly, the sealing lip will vibrate (lip tremor), leading to abnormal wear, noise, heat generation, powder production, and ultimately seal failure.

[0004] 2. Non-contact lip seals: These seals have a clearance (typically 0~+0.10mm) between the sealing lip and the shaft surface. While this avoids contact wear, in practical applications, especially when the dimensions of the shaft and sealing lip are within their tolerance limits, the clearance can increase, allowing external contaminants to easily enter the sealing cavity. Additionally, there is a possibility of a small amount of grease leaking through the clearance after softening and expanding at high temperatures, compromising the long-term stable operation of the equipment.

[0005] In view of this, a roller end sealing device doped with unsaturated fatty amide is proposed. Utility Model Content

[0006] To overcome the shortcomings of the prior art, the purpose of this utility model is to provide a roller end sealing device doped with unsaturated fatty amide.

[0007] The technical solution adopted by this utility model is as follows: a roller end sealing device doped with unsaturated fatty amide, comprising a rubber fixing part, a sealing lip part, and a skeleton part located between the two. The inner end face of the sealing lip part has a first sealing lip on the medium side and a second sealing lip and a third sealing lip on the air side. The first sealing lip is in contact with the shaft surface, and the second and third sealing lips form a non-contact gap with the shaft. The first sealing lip is doped with oleic amide material to form a grease film on its lip surface.

[0008] In a preferred embodiment, the outer surface of the third sealing lip on the air side is provided with a plurality of herringbone-shaped guide grooves spaced circumferentially.

[0009] In a preferred embodiment, the sealing lip, together with the first sealing lip, the second sealing lip and the third sealing lip, forms two sets of collecting cavities, the collecting cavities having a U-shaped cross-section.

[0010] In a preferred embodiment, the size of the non-contact gap between the second and third sealing lips and the shaft is 0.10 mm to 0.20 mm.

[0011] In a preferred embodiment, the side surface of the rubber fixing part is provided with several sets of annular ribs that abut against the flange along its thickness direction.

[0012] In a preferred embodiment, the outer surface of the rubber fixing part on the air side is provided with an annular protrusion, and a groove for accommodating the annular protrusion after deformation is formed in the outer periphery of the rubber fixing part.

[0013] In a preferred embodiment, both the annular rib and the annular protrusion section are arranged in an arc shape.

[0014] In a preferred embodiment, both the sealing lip and the rubber fixing part are made of rubber material.

[0015] In a preferred embodiment, the skeleton is made of cold-rolled low-carbon steel sheet by a butt-welding roll forming process.

[0016] In a preferred embodiment, the rubber fixing part, the sealing lip part, and the skeleton part are integrally vulcanized using a hot vulcanizing adhesive.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0018] 1. In this utility model, oleic acid amide material is doped into the first sealing lip that contacts the shaft. When the first sealing lip heats up due to friction caused by the rotation of the shaft, the oleic acid amide can automatically migrate to the lip surface to form an extremely thin lubricating oil film. This can fundamentally solve the problem of insufficient lubrication and lip vibration caused by instantaneous high speed, improve the stability under high-speed operation, reduce equipment operating noise, and extend service life.

[0019] 2. In this utility model, there is a non-contact gap between the sealing lip on the air side and the shaft surface. At the same time, a herringbone-shaped guide groove is designed on the outermost third sealing lip. With the help of the radial centrifugal force of the rotating roller, the laminar air formed in the gap can be guided to the outside. This design carries away the frictional heat and cools the sealing surface. On the other hand, it forms a stable airflow from the outside to the inside, which can effectively block the intrusion of small-diameter pollutants from the outside.

[0020] 3. In this utility model, the two collection chambers between the three sealing lips can serve as temporary storage chambers to collect the overflowing grease when it expands and overflows at high temperatures, and feed it back to the sealing lip surface, preventing environmental pollution while also providing additional lubrication. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the planar structure of the present invention;

[0022] Figure 2 for Figure 1 A simplified schematic diagram of the cross-sectional planar structure at point AA.

[0023] Figure 3 for Figure 2 A simplified schematic diagram of a partially enlarged structure in the image;

[0024] Figure 4 for Figure 1 A simplified schematic diagram of a partially enlarged planar structure in the image;

[0025] Figure 5 This is a simplified structural diagram and a partially enlarged view of the present invention applied to the shaft and flange.

[0026] Markings in the diagram: 100 - sealing device, 200 - shaft, 300 - flange;

[0027] 110 - Rubber fixing part, 120 - Skeleton part, 130 - Sealing lip;

[0028] 111 - Annular protrusion, 112 - Annular rib;

[0029] 131-First sealing lip, 132-Second sealing lip, 133-Third sealing lip, 134-Herringbone guide groove, 135-Collection chamber. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0031] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0033] A roller end sealing device doped with unsaturated fatty amide, as described in the reference Figure 1-5 It includes a rubber fixing part 110, a sealing lip 130 and a skeleton part 120 located between the two. The inner end face of the sealing lip 130 has a first sealing lip 131 on the medium side and a second sealing lip 132 and a third sealing lip 133 on the air side. The first sealing lip 131 is in contact with the surface of the shaft 200. The first sealing lip 131 is doped with oleamide material to form a grease film on its lip surface.

[0034] By adopting the above technical solution, oleic acid amide material is doped into the first sealing lip 131 that contacts the shaft 200. When the first sealing lip 131 heats up due to friction with the shaft 200 as it rotates, the oleic acid amide can automatically migrate to the lip surface to form an extremely thin lubricating oil film. This can fundamentally solve the problem of insufficient lubrication and lip vibration caused by instantaneous high speed, improve stability under high-speed operation, reduce equipment operating noise, and extend service life.

[0035] Among them, the amount of oleamide added is 2-3 parts per 100 parts by weight of rubber. It can be added without changing the preparation process of the compound. The molecular structure of oleamide has a cis (Z) double bond between the 9th and 10th carbon atoms in the carbon chain, which can easily form a migration in the rubber material, and thus can automatically migrate to the lip surface to form a lubricating oil film.

[0036] In this embodiment, please refer to Figure 3 , Figure 4 as well as Figure 5 As shown, a non-contact gap is formed between the second sealing lip 132 and the third sealing lip 133 and the shaft 200. The size of the non-contact gap between the second sealing lip 132 and the third sealing lip 133 and the shaft 200 is 0.10mm~0.20mm. Multiple herringbone-shaped guide grooves 134 are arranged circumferentially on the outer surface of the third sealing lip 133 on the air side. There is a non-contact gap between the second sealing lip 132 and the third sealing lip 133 on the air side and the surface of the shaft 200. At the same time, a herringbone-shaped guide groove 133 is designed on the outermost third sealing lip. With the help of the radial centrifugal force of the shaft 200 rotation, the laminar air formed in the gap can be guided to the outside. This design carries away frictional heat and cools the sealing surface. On the other hand, it forms a stable airflow direction from the outside to the inside (outer side of the shaft surface → non-contact gap → guide groove), which can effectively block the intrusion of external small-diameter pollutants and has the functions of sealing, cooling and dust prevention.

[0037] In this embodiment, please refer to Figure 3 As shown, the sealing lip 130, together with the first sealing lip 131, the second sealing lip 132 and the third sealing lip 133, forms two sets of collection cavities 135. The cross-section of the collection cavity 135 is U-shaped. The two collection cavity structures between the three sealing lips can serve as temporary storage cavities to collect the overflowing grease when it expands and overflows at high temperature, and feed it back to the lubricating sealing lip surface, preventing environmental pollution while also providing additional lubrication.

[0038] In this embodiment, please refer to Figure 3 and Figure 5 As shown, the side surface of the rubber fixing part 110 is provided with several sets of annular ribs 112 that abut against the flange 300 along its thickness direction. A static sealing line (i.e., annular ribs 112) is provided on the outer diameter surface of the rubber fixing part 110, which reduces the contact area and pressing force when the oil seal is pressed into the mounting hole, facilitates installation, and ensures a reliable seal on the outer diameter surface.

[0039] In this embodiment, please refer to Figure 3 and Figure 5 As shown, the outer surface of the rubber fixing part 110 on the air side is provided with an annular protrusion 111. The annular protrusion 111 is recessed in the rubber fixing part 110 in the peripheral direction to form a groove for accommodating the deformed annular protrusion 111. The annular protrusion 111 is designed on the outer surface of the rubber fixing part 110 on the air side, which can be used to compensate for the machining deviation of the flange oil seal mounting hole depth. When the hole depth exceeds the tolerance, the protrusion structure can support the interference pressure of the gland on the sealing device body to ensure that the gland is tightened. When the hole depth is standard, the protrusion part can be compressed and deformed into the preset groove to ensure the flatness of the installation.

[0040] In this embodiment, please refer to Figure 3 As shown, both the annular rib 112 and the annular protrusion 111 have an arc-shaped cross-section.

[0041] In this embodiment, both the sealing lip 130 and the rubber fixing part 110 are made of rubber material. It should be noted that the rubber fixing part 110 only performs a static sealing function and has low requirements for rubber performance. It can use a low-cost rubber material different from the self-lubricating sealing lip to further reduce the cost of the rubber compound. The specific composition is not specifically limited here.

[0042] In this embodiment, the skeleton part 120 is made of cold-rolled low-carbon steel plate by butt welding and rolling process. Compared with the traditional stamping and stretching process, the butt welding and rolling process reduces the requirements for plate grade and processing equipment, significantly saves production costs, and has a better cost performance.

[0043] In this embodiment, the rubber fixing part 110, the sealing lip part 130 and the skeleton part 120 are integrally vulcanized by hot vulcanizing adhesive. This integral molding process ensures that the components are firmly connected, the overall structure is stable and reliable, and the sealing performance is durable.

[0044] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A roller end sealing device doped with unsaturated fatty amide, characterized in that, It includes a rubber fixing part, a sealing lip, and a skeleton part located between the two. The inner end face of the sealing lip has a first sealing lip on the medium side and a second and a third sealing lip on the air side. The first sealing lip is in contact with the shaft surface, and the second and third sealing lips form a non-contact gap with the shaft. The first sealing lip is doped with oleamide material to form a grease film on its lip surface.

2. The roller end sealing device doped with unsaturated fatty amide as described in claim 1, characterized in that: The third sealing lip has multiple herringbone-shaped guide grooves spaced circumferentially on its outer surface on the air side.

3. The roller end sealing device doped with unsaturated fatty amide as described in claim 2, characterized in that: The sealing lip, together with the first sealing lip, the second sealing lip and the third sealing lip, forms two sets of collection cavities, and the cross-section of the collection cavities is U-shaped.

4. The roller end sealing device doped with unsaturated fatty amide as described in claim 3, characterized in that: The non-contact gap between the second and third sealing lips and the shaft body is 0.10mm to 0.20mm.

5. The roller end sealing device doped with unsaturated fatty amide as described in claim 1, characterized in that: The side surface of the rubber fixing part has several sets of annular ribs that abut against the flange, distributed at intervals along its thickness direction.

6. The roller end sealing device doped with unsaturated fatty amide as described in claim 5, characterized in that: The outer surface of the rubber fixing part on the air side is provided with an annular protrusion, and the outer periphery of the annular protrusion is recessed on the rubber fixing part to form a groove for accommodating the annular protrusion after deformation.

7. The roller end sealing device doped with unsaturated fatty amide as described in claim 6, characterized in that: Both the annular ribs and the annular protruding cross-sections are arranged in an arc shape.

8. The roller end sealing device doped with unsaturated fatty amide as described in claim 1, characterized in that: Both the sealing lip and the rubber fixing part are made of rubber material.

9. The roller end sealing device doped with unsaturated fatty amide as described in claim 8, characterized in that: The skeleton is made of cold-rolled low-carbon steel plate through a butt-welding and rolling process.

10. The roller end sealing device doped with unsaturated fatty amide as described in any one of claims 1-9, characterized in that: The rubber fixing part, sealing lip and skeleton part are integrally vulcanized by hot vulcanizing adhesive.

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