Multi-pass sealing device for slewing bearing

Abstract

The present invention relates to a new type of multi-pass sealing device for a slewing bearing, comprising an outer ring and an inner ring, the outer ring and the inner ring are connected by balls, an upper sealing mechanism and a lower sealing mechanism are installed at the joint of the outer ring and the inner ring, the outer part of the lower sealing mechanism is installed on the outer ring, and the inner part is installed on the inner ring; the upper sealing mechanism is installed on the inner ring at the upper part of the lower sealing mechanism, and a sealing cavity is formed between the upper sealing mechanism and the lower sealing mechanism. The advantages of the present invention are: by setting the upper sealing mechanism and the lower sealing mechanism, a multi-pass sealing structure is realized, the sealing is tight, and it is effectively waterproof and dustproof. It can effectively prevent the first rubber sealing ring from falling out of the sealing groove; a lubricating oil channel is also provided, which can not only provide lubrication for the first rubber sealing ring and the second rubber sealing ring all the time and increase their service life, but also effectively prevent the entry of foreign impurities.

Description

Technical Field

[0001] The invention relates to a multi-channel sealing device for a slewing bearing, which is used for sealing a bearing. Background Art

[0002] Slewing bearing is a large bearing that can bear comprehensive loads and can bear large axial and radial loads and overturning moments at the same time. Slewing bearings are widely used in ship equipment, engineering machinery, light industrial machinery, metallurgical machinery, medical machinery, industrial machinery and other industries.

[0003] At present, most of the sealing devices of slewing bearings adopt single-layer dustproof rubber flat sealing strips, which have simple structure but poor waterproof and dustproof performance, and cannot meet the requirements of slewing bearings in special environments with harsh working conditions and serious environmental pollution.

[0004] During use, the dustproof seals of the inner and outer rings of the slewing bearing often wear out or fall off, causing the slewing bearing raceway to lose its sealing protection, resulting in a series of problems such as larger clearances and oil leakage in the slewing bearing, and a serious reduction in service life. Summary of the invention

[0005] In order to overcome the defects of the prior art, the purpose of the present invention is to provide a multi-pass sealing device for a slewing bearing, so as to solve the problems of the traditional slewing bearing sealing structure proposed in the above background technology, such as insufficient sealing performance, easy wear and failure, and easy falling off. The technical solution of the present invention is:

[0006] A multi-pass sealing device for a slewing bearing comprises an outer ring and an inner ring, wherein the outer ring and the inner ring are connected by balls, an upper sealing mechanism and a lower sealing mechanism are installed at the joint of the outer ring and the inner ring, the outer portion of the lower sealing mechanism is installed on the outer ring, and the inner portion is installed on the inner ring; the upper sealing mechanism is installed on the inner ring at the upper part of the lower sealing mechanism, and a sealing cavity is formed between the upper sealing mechanism and the lower sealing mechanism.

[0007] The lower sealing mechanism includes an integrally formed first rubber sealing ring, the inner side of which is provided with a plurality of upper lips and lower lips, the upper end surface of the first rubber sealing ring is provided with the upper lip, each of the upper lips is inclined outward, and a spacing is formed between two adjacent upper lips; the lower end surface of the first rubber sealing ring is provided with the lower lip, each of the lower lips is inclined inward, and a spacing is formed between two adjacent lower lips; the upper lip and the lower lip are both inserted into the sealing ring groove of the inner ring; an annular protrusion is also provided on the upper end surface of the first rubber sealing ring, and the annular protrusion corresponds to the upper sealing mechanism; a screw vertically passes through the first rubber sealing ring to fix the first rubber sealing ring at the recessed groove of the outer ring, and the recessed groove is provided adjacent to the sealing ring groove.

[0008] The upper end surface of the annular protrusion is higher than the upper end surface of the outer ring, forming a height difference with the outer ring.

[0009] The upper lip forms a first angle with the horizontal plane, which is an acute angle; the lower lip forms a second angle with the horizontal plane, which is an acute angle. The upper lip and the lower lip are tightly matched with the sealing ring groove.

[0010] The upper sealing mechanism includes a second rubber sealing ring, a trapezoidal groove is opened in the middle of the second rubber sealing ring, the second rubber sealing ring is sleeved on the periphery of the inner ring, the inner wall of the second rubber sealing ring is tightly fitted with the outer surface of the inner ring, the outer edge of the second rubber sealing ring is inclined outward and pressed on the top surface of the outer ring, the outer edge of the second rubber sealing ring forms a third angle with the vertical direction, and the third angle is an acute angle; the sealing cavity is formed between the annular protrusion and the trapezoidal groove.

[0011] A lubricating oil channel is also provided in the sealing ring groove, and a lubricating joint is provided on the upper part of the inner ring. The oil inlet of the lubricating joint is connected to the lubrication system, and the oil outlet corresponds to the lubricating oil channel.

[0012] The advantages of the present invention are: by setting the upper sealing mechanism and the lower sealing mechanism, a multi-channel sealing structure is realized, the sealing is tight, and it is effectively waterproof and dustproof. It can effectively prevent the first rubber sealing ring from coming out of the sealing ring groove; and a lubricating oil channel is also provided, which can not only provide lubrication for the first rubber sealing ring and the second rubber sealing ring to increase their service life, but also effectively prevent the entry of foreign impurities. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a half-section schematic diagram of the main structure of the present invention.

[0014] Figure 2 yes Figure 1 Schematic diagram of the structure of the middle and outer circles.

[0015] Figure 3 yes Figure 1 Schematic diagram of the structure of the inner circle.

[0016] Figure 4 yes Figure 1 Schematic diagram of the structure of the middle and lower sealing mechanism.

[0017] Figure 5 yes Figure 1 Schematic diagram of the structure of the middle and upper sealing mechanism. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with specific embodiments, and the advantages and features of the present invention will become clearer as the description proceeds. However, these embodiments are exemplary only and do not constitute any limitation to the scope of the present invention. It should be understood by those skilled in the art that the details and forms of the technical solution of the present invention may be modified or replaced without departing from the spirit and scope of the present invention, but these modifications and replacements all fall within the scope of protection of the present invention.

[0019] See also Figures 1 to 5 The present invention relates to a multi-pass sealing device for a slewing bearing, comprising an outer ring 1 and an inner ring 2, wherein the outer ring 1 and the inner ring 2 are connected via balls 3, and an upper sealing mechanism and a lower sealing mechanism are installed at the joint between the outer ring 1 and the inner ring 2, wherein the outer portion of the lower sealing mechanism is installed on the outer ring 1, and the inner portion is installed on the inner ring 2; the upper sealing mechanism is installed on the inner ring 2 at the upper part of the lower sealing mechanism, and a sealing cavity 17 is formed between the upper sealing mechanism and the lower sealing mechanism.

[0020] The lower sealing mechanism includes an integrally formed first rubber sealing ring 7, and a plurality of upper lips 10 and lower lips 11 are arranged on the inner side of the first rubber sealing ring 7. The upper lip 10 is arranged on the upper end surface of the first rubber sealing ring 7, and each of the upper lips 10 is arranged to be inclined outward, and a gap is formed between two adjacent upper lips 10; the lower lip 11 is arranged on the lower end surface of the first rubber sealing ring 7, and each of the lower lips 11 is arranged to be inclined inward, and a gap is formed between two adjacent lower lips 11; the upper lip 10 and the lower lip 11 are both inserted into the sealing ring groove 5 of the inner ring 2; an annular protrusion 12 is also arranged on the upper end surface of the first rubber sealing ring 7, and the annular protrusion 12 corresponds to the upper sealing mechanism; a screw 8 vertically passes through the first rubber sealing ring 7 to fix the first rubber sealing ring 7 at the recessed groove 4 of the outer ring, and the recessed groove 4 is arranged adjacent to the sealing ring groove 5.

[0021] The upper end surface of the annular protrusion 12 is higher than the upper end surface of the outer ring 1 , forming a height difference C with the outer ring 1 to prevent the inflow of external spray water.

[0022] The upper lip 10 forms a first angle A with the horizontal plane, which is an acute angle; the lower lip 11 forms a second angle B with the horizontal plane, which is an acute angle. The upper lip 10 and the lower lip 11 are tightly matched with the sealing ring groove 5.

[0023] The upper sealing mechanism includes a second rubber sealing ring 9, a trapezoidal groove is provided in the middle of the second rubber sealing ring 9, the second rubber sealing ring 9 is sleeved on the periphery of the inner ring 2, the inner wall 13 of the second rubber sealing ring 9 is tightly fitted with the outer surface of the inner ring 2, the outer edge 14 of the second rubber sealing ring 9 is tilted outward and pressed on the top surface of the outer ring 1, the outer edge 14 of the second rubber sealing ring 9 forms a third angle D with the vertical direction, and the third angle D is an acute angle; the sealing cavity 17 is formed between the upper annular protrusion 12 and the trapezoidal groove.

[0024] A lubricating oil passage 6 is also provided in the sealing ring groove 5 , and a lubricating joint 15 is provided on the upper part of the inner ring 2 . The oil inlet of the lubricating joint 15 is connected to the lubrication system (existing technology), and the oil outlet corresponds to the lubricating oil passage 6 .

[0025] The working principle of the present invention is: lubricating grease is continuously delivered to the sealing cavity 17 between the first rubber sealing ring 7 and the second rubber sealing ring 9 through the lubrication system (the lubricating grease enters the sealing ring groove through the lubricating oil channel and then enters the sealing cavity), which can not only provide lubrication for the first rubber sealing ring 7 and the second rubber sealing ring 9 to improve their service life, but also effectively prevent external impurities from entering.

[0026] The lower sealing mechanism is fixed on the outer ring and the inner ring. By providing the upper sealing mechanism with an upper lip, a lower lip and an annular protrusion, multiple sealing between the outer ring and the inner ring is achieved, which strictly prevents external dust and impurities from entering the raceway 16, and at the same time ensures that the grease smoothly enters and is retained in the sealing cavity 17 between the first rubber sealing ring 7 and the second rubber sealing ring 9 without being lost.

[0027] This solution can also be used on the slewing bearing of a mixer or a wheel mill, with significant effects, simple structure and low cost.

Claims

1. A multi-pass sealing device for a slewing bearing, comprising an outer ring (1) and an inner ring (2), wherein the outer ring (1) and the inner ring (2) are connected via balls (3), wherein: An upper sealing mechanism and a lower sealing mechanism are installed at the joint between the outer ring (1) and the inner ring (2), the outer portion of the lower sealing mechanism being installed on the outer ring (1) and the inner portion being installed on the inner ring (2); the upper sealing mechanism being installed on the inner ring (2) at the upper portion of the lower sealing mechanism, and forming a sealing cavity (17) between the upper sealing mechanism and the lower sealing mechanism; The lower sealing mechanism comprises an integrally formed first rubber sealing ring (7), the inner side of which is provided with a plurality of upper lips (10) and lower lips (11), the upper end surface of the first rubber sealing ring (7) being provided with the upper lip (10), each of the upper lips (10) being inclined outwardly, and a spacing being formed between two adjacent upper lips (10); and the lower lip (11) being provided with the lower end surface of the first rubber sealing ring (7), each of the lower lips (11) being inclined inwardly, and A spacing is formed between two adjacent lower lips (11); the upper lip (10) and the lower lip (11) are both placed in the sealing ring groove (5) of the inner ring (2); an annular protrusion (12) is also provided on the upper end surface of the first rubber sealing ring (7), and the annular protrusion (12) corresponds to the upper sealing mechanism; a screw (8) vertically passes through the first rubber sealing ring (7) to fix the first rubber sealing ring (7) at the recessed groove (4) of the outer ring, and the recessed groove (4) is arranged adjacent to the sealing ring groove (5); The upper sealing mechanism comprises a second rubber sealing ring (9), a trapezoidal groove is provided in the middle of the second rubber sealing ring (9), the second rubber sealing ring (9) is sleeved on the periphery of the inner ring (2), the inner wall (13) of the second rubber sealing ring (9) is tightly fitted with the outer surface of the inner ring (2), the outer edge (14) of the second rubber sealing ring (9) is inclined outwards and pressed on the top surface of the outer ring (1), the outer edge (14) of the second rubber sealing ring (9) forms a third angle (D) with the vertical direction, and the third angle (D) is an acute angle; the sealing cavity (17) is formed between the annular protrusion (12) and the trapezoidal groove; A lubricating oil passage (6) is also provided in the sealing ring groove (5), and a lubricating joint (15) is provided on the upper part of the inner ring (2). The oil inlet of the lubricating joint (15) is connected to the lubrication system, and the oil outlet corresponds to the lubricating oil passage (6).

2. The multi-pass sealing device for a slewing bearing according to claim 1, characterized in that: The upper end surface of the annular protrusion is higher than the upper end surface of the outer ring, forming a height difference with the outer ring.

3. The multi-pass sealing device for a slewing bearing according to claim 1 or 2, characterized in that: The upper lip (10) forms a first angle (A) with the horizontal plane, and the first angle (A) is an acute angle; the lower lip (11) forms a second angle (B) with the horizontal plane, and the second angle (B) is an acute angle. The upper lip (10) and the lower lip (11) are tightly matched with the sealing ring groove (5).

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