Deck crane super large turntable bearing with waterproof and anticorrosion performance

Abstract

The present application relates to the technical field of bearing, in particular to a large-scale rotary disc bearing with waterproof and anticorrosive performance for deck crane of ship. Two special-shaped sealing rings with sealing lips are arranged on the lower end face of the outer ring of the bearing, the upper special-shaped sealing ring comprises an upper sealing lip extending from lower to upper in a radial inner direction, and a middle sealing lip connected to the lower position of the upper sealing lip and extending from upper to lower in a radial inner direction, the lower special-shaped sealing ring comprises a lower sealing lip extending from upper to lower in a radial inner direction, the three sealing lips are in sealing cooperation with the side face of the inner ring, and each two adjacent sealing lips form a grease sealing ring cavity filled with lubricating grease. The multiple sealing is formed, and the bearing is effectively prevented from being abraded by the sealing lips when rotating, and the lubricating grease forms an oil film between the sealing lips, which further enhances the sealing effect.

Description

Technical Field

[0001] This invention relates to the field of bearing technology, and in particular to an extra-large slewing bearing for marine deck cranes with waterproof and corrosion-resistant properties. Background Technology

[0002] With the rapid development of marine-related industries, the demand for large-tonnage marine cranes used in marine engineering construction such as offshore wind turbine installation and maintenance, oil drilling platform construction, and cross-sea bridge construction has increased significantly. Extra-large slewing bearings for marine deck cranes are key components of these heavy-duty cranes. These large-tonnage marine deck cranes require extra-large slewing bearings as rotating parts. While ordinary slewing bearings are generally under 6 meters in size, the slewing bearings used in these cranes are mostly between 7 and 15 meters in size, far exceeding the size range of ordinary slewing bearings.

[0003] Large deck cranes require slewing bearings capable of ±360° azimuth rotation and able to withstand significant axial, radial, overturning, and rotational torque forces. This necessitates the design of ultra-large slewing bearings to meet the load-bearing requirements of deck cranes. Currently, three-row cylindrical roller bearings, crossed cylindrical roller bearings, and four-point contact ball bearings are commonly used for ultra-large slewing bearings in marine deck cranes. Compared to crossed cylindrical roller bearings, three-row cylindrical roller bearings, for the same diameter, have an increased number of load-bearing rollers, thus reducing the load on each roller and resulting in higher load-bearing capacity. Furthermore, compared to four-point contact ball bearings, the rollers and raceways of three-row cylindrical roller bearings have line contact, leading to lower contact stress and higher load-bearing capacity. Therefore, using three-row cylindrical roller bearings better meets the load-bearing requirements.

[0004] One race of the crane slewing bearing is a fixed race, permanently mounted on the ship's deck, while the other race is a rotating race, on which the crane's main engine is fixed. When the ship encounters large waves, the slewing bearing on the deck is far from the ship's center of motion. The crane's main engine forms a load connected to the rotating race, generating significant inertial swaying. Due to the larger diameter and relatively larger clearance of the slewing bearing, there is a greater relative displacement between the inner and outer races compared to smaller bearings. Furthermore, in windy and wavery conditions, seawater splashes onto the deck, and in heavy rain, rainwater accumulates. If there is significant relative displacement between the inner and outer races of the slewing bearing, seawater can easily enter, causing deterioration of the internal lubricating grease and corrosion of the internal rolling elements, severely impacting the slewing bearing's service life.

[0005] Chinese utility model patent CN204327768U discloses a lubricated ring slewing bearing, a three-row cylindrical roller bearing for marine mooring systems. To address the problem of high starting torque in traditional slewing bearings where a circular spring ring applies sealing pressure to the sealing lip, a double-lip seal ring with a main sealing lip and a secondary sealing lip is fitted between the outer circumference of the inner ring and the inner circumference of the outer ring. This seal relies on the elasticity of the sealing lips for a tight seal, requiring less pressure than the spring ring. This reduces friction between the sealing lip and the corresponding mating surface, decreasing starting torque and slowing down lip wear.

[0006] However, double-lip seals typically have one thick (primary sealing lip) and one thin (secondary sealing lip). In the aforementioned prior art, the double-lip seal installed between the lower outer circumferential surface of the inner ring and the lower inner circumferential surface of the outer ring has a thinner secondary sealing lip positioned outwards and tilted downwards, while the thicker primary sealing lip is positioned inwards and tilted upwards. The thinner secondary sealing lip has weak elasticity and is not wear-resistant. When this sealing method is applied to the slewing bearings of marine deck cranes, due to the operating conditions, seawater can easily breach the secondary sealing lip and enter the annular space between the primary and secondary sealing lips. After a period of use, due to wear of the primary sealing lip, seawater will breach both seals and enter the bearing interior, leading to seal failure. Summary of the Invention

[0007] The purpose of this invention is to provide a waterproof and corrosion-resistant extra-large slewing bearing for marine deck cranes, in order to solve the problem that the sealing method of existing slewing bearings has poor sealing reliability for the operating conditions of extra-large slewing bearings for marine deck cranes, resulting in a short bearing service life.

[0008] The present invention provides an extra-large slewing bearing for marine deck cranes with waterproof and corrosion-resistant properties, employing the following technical solution: A large slewing bearing for marine deck cranes with waterproof and corrosion-resistant properties includes an inner ring and an outer ring. The inner ring of the slewing bearing is an integral ring, and the outer ring includes a separate upper outer ring and a lower outer ring. Two irregularly shaped sealing rings with sealing lips are stacked and installed near the inner side of the lower end face of the outer ring. The upper irregularly shaped sealing ring includes an upper sealing lip that extends radially inward from bottom to top, and a middle sealing lip that is connected to the lower position of the upper sealing lip and extends radially inward from top to bottom. The lower irregularly shaped sealing ring includes a lower sealing lip that extends radially inward from top to bottom. The upper, middle and lower sealing lips are all sealed and fitted with the side of the inner ring. Each pair of adjacent sealing lips forms a sealing annular cavity filled with lubricating grease to form a grease sealing annular cavity.

[0009] The beneficial effects of the above technical solution are: This invention is an improved invention that improves the sealing form between the inner and outer rings of the existing slewing bearing. By using two irregularly shaped sealing rings stacked together, the sealing performance is guaranteed under the operating conditions of marine deck cranes.

[0010] Specifically, the upper shaped sealing ring includes an upper sealing lip extending obliquely upward from the bottom, and a middle sealing lip connected to the lower position of the upper sealing lip and extending obliquely downward radially inward. The lower shaped sealing ring includes a lower sealing lip extending obliquely downward radially inward. The inner edges of the upper, middle, and lower sealing lips all seal with the side of the inner ring. Thus, the upper sealing lip and the middle sealing lip form an annular cavity, and the middle sealing lip and the lower sealing lip form an annular cavity. Both annular cavities are filled with lubricating grease, thereby forming a grease-sealed annular cavity. The grease-sealed annular cavity can both press the two sealing lips that make up the annular cavity against the side of the inner ring, ensuring a seal based on the elasticity of the sealing lips themselves, and occupy the internal space of the annular cavity by the lubricating grease filling the annular cavity, preventing seawater from entering the annular cavity and ensuring a seal. At the same time, it can form an oil film between the sealing lips and the side of the inner ring. The formation of the oil film can prevent seawater from adhering to the surface of the sealing lips and the side of the inner ring, achieving effective water isolation. It also helps to reduce the friction between the sealing lips and the side of the inner ring, reduce the wear of the sealing lips, and promote a better seal.

[0011] The sealing lips of two irregularly shaped sealing rings cooperate to form two grease sealing ring cavities and three sealing lips, forming a five-fold seal with a relatively simple structure. Moreover, the sealing lips are alternately sealed by elastic compression force and sealed by grease barrier seal that is incompatible with water, resulting in high sealing reliability and a long effective sealing life.

[0012] Furthermore, an annular groove is provided on the lower end face of the outer sleeve near the inner circumferential surface. The radial inner side and lower side of the annular groove are open. The two irregular sealing rings are stacked from bottom to top and inserted into the annular groove. An annular sealing pressure plate is also connected to the lower end face of the outer sleeve to press the two stacked irregular sealing rings together from bottom to top.

[0013] The beneficial effects of the above technical solution are as follows: The slewing bearing of the present invention is an extra-large slewing bearing, with a diameter typically between 7 and 15 meters, and the circumference of the irregular-shaped sealing ring is between 20 and 47 meters. The above installation method can achieve the installation of the sealing ring on the bearing race without causing the irregular-shaped sealing ring to be stretched or deformed. It can also prevent the irregular-shaped sealing ring from deforming prematurely during installation, thus avoiding affecting the consistency of the sealing effect in the entire circumferential direction during subsequent use. Moreover, it facilitates the installation of the irregular-shaped sealing ring.

[0014] Furthermore, both irregular sealing rings include an annular main body portion within an annular groove and a sealing lip portion extending inward from the annular main body portion. The sealing pressure plate presses the annular main body portions of the two irregular sealing rings together from bottom to top. The sealing lip portion of the upper irregular sealing ring includes a root portion extending radially horizontally inward at the lower end of the annular main body portion. The upper sealing lip extends inward and upward from the radially inner end of the root portion. The sealing lip portion of the lower irregular sealing ring includes a root portion extending radially inward and upward near the upper end of the annular main body portion. The lower sealing lip extends inward and downward from the radially inner end of the root portion, forming an annular groove structure with a V-shaped cross-section that slopes downward with the root portion. There is an annular space between the lower side of the root portion of the sealing lip portion of the upper irregular sealing ring and the upper side of the root portion of the sealing lip portion of the lower irregular sealing ring to avoid direct contact.

[0015] The beneficial effects of the above technical solution are as follows: With the aforementioned structure and mutual cooperation between the two shaped sealing rings, when seawater surges upwards from the lower end gap between the inner and outer rings, compressing the sealing lip of the lower shaped sealing ring, the sealing lip of the lower shaped sealing ring expands radially inwards under pressure due to the downward-sloping V-shaped annular groove structure formed by the sealing lip. This allows more of the lower sealing lip to adhere tightly to the side of the inner ring. This design, where the tighter the fit under pressure, effectively ensures the sealing capability of the lower sealing lip. Furthermore, as the lower sealing lip tightens, the oil pressure within the grease sealing ring cavity formed by the lower and middle sealing lips increases, which helps resist external water pressure and also improves the sealing performance of the lower grease sealing ring cavity during this process.

[0016] Furthermore, there is an annular space between the lower side of the root portion of the sealing lip of the upper shaped sealing ring and the upper side of the root portion of the sealing lip of the lower shaped sealing ring, which prevents the two from directly fitting together. Therefore, when the sealing lip of the lower shaped sealing ring is impacted and squeezed by seawater from bottom to top, and tends to deform radially inward around the root portion, it will not directly push the sealing lip of the upper shaped sealing ring from bottom to top, and will not affect the sealing effect of the sealing lip of the upper shaped sealing ring.

[0017] Furthermore, a recess is provided on the radially inner side of the lower sealing lip at the root position where it connects to the root portion, so that the thickness at that position is reduced.

[0018] The beneficial effects of the above technical solution are: through the above thickness reduction design, when seawater surges upward from the lower end gap between the inner and outer rings and squeezes the sealing lip of the shaped sealing ring, the lower sealing lip is more likely to deform radially inward around its root, thereby reliably sealing with the outer circumference of the inner ring.

[0019] Furthermore, the thickness of the middle sealing lip is less than the thickness of the upper and lower sealing lips.

[0020] The beneficial effects of the above technical solution are: this design can avoid the elasticity of the middle sealing lip being stronger than that of the upper and lower sealing lips. When radial movement occurs between the inner and outer rings, the elastic deformation of the middle sealing lip will squeeze the grease in the grease sealing ring cavity on one of the upper and lower sides outward, which helps to reduce grease leakage from the grease sealing ring cavity.

[0021] Furthermore, the inner end of the upper sealing lip is thickened radially inward.

[0022] The beneficial effects of the above technical solution are: it enhances the wear resistance of the upper sealing lip, extends the sealing life of the last seal, and helps to improve the effective sealing life of the entire slewing bearing.

[0023] Furthermore, a wear-resistant coating is sprayed onto the outer circumference of the inner ring at the position corresponding to the sealing lips of the upper and lower irregular sealing rings, and the surface of the wear-resistant coating is smooth.

[0024] The beneficial effects of the above technical solution are: this design reduces the wear on the sealing lip and the surface of the ring, thus extending the effective sealing life.

[0025] Furthermore, the lower outer ring has blind screw holes, and the upper outer ring has connecting holes corresponding to the blind screw holes. The upper and lower outer rings are connected by connecting screws.

[0026] The beneficial effects of the above technical solution are: it can avoid the presence of holes on the lower end face of the outer race, ensure the integrity of the lower end face, reduce the path for moisture to enter the bearing, and improve waterproof and corrosion resistance.

[0027] Furthermore, the upper end face of the outer sleeve is a connecting surface for bonding with other components. Waterproof sealing rings are provided on the inner and outer sides of the connecting hole on the upper end face. The lower side of the waterproof sealing ring that contacts the bottom of the sealing ring mounting groove on the outer sleeve is an annular plane. The upper side of the waterproof sealing ring has an annular plane in the middle for bonding with other components.

[0028] The beneficial effects of the above technical solution are: the waterproof sealing ring is sealed by fitting and sealing the surface of the corresponding component through the annular planes on the upper and lower sides, the sealing path is longer, the sealing effect is better, and the sealing performance between the upper outer ring and other components is guaranteed.

[0029] Furthermore, the lower end face of the inner ring is a connecting surface for bonding with other components. Waterproof sealing rings are provided on the inner and outer radial sides of the connecting hole on the lower end face. The upper side of the waterproof sealing ring that contacts the bottom of the sealing ring mounting groove on the inner ring is an annular plane. The lower side of the waterproof sealing ring has an annular plane in the middle for bonding with other components.

[0030] The beneficial effects of the above technical solution are: the waterproof sealing ring is sealed by fitting and sealing the surface of the corresponding component through the annular planes on the upper and lower sides, the sealing path is longer, the sealing effect is better, and the sealing performance between the inner ring and other components is guaranteed.

[0031] Furthermore, at least one waterproof sealing ring is provided at the connection between the upper outer ring and the lower outer ring, and the waterproof sealing ring is respectively sealed to the upper and lower outer rings through annular planes.

[0032] The beneficial effects of the above technical solution are: the waterproof sealing ring is sealed by fitting and sealing the surface of the corresponding component through the annular planes on the upper and lower sides, the sealing path is longer, the sealing effect is better, and the sealing performance between the upper outer ring and the lower outer ring is guaranteed.

[0033] Furthermore, the non-mounting surface of the bearing is a sandblasted surface, and the sandblasted surface is covered with an anti-corrosion paint layer.

[0034] The beneficial effect of the above technical solution is that it improves the waterproof and corrosion-resistant performance of the exposed outer surface of the bearing. Attached Figure Description

[0035] Figure 1 This is a cross-sectional view of one embodiment of the extra-large slewing bearing for marine deck cranes with waterproof and corrosion-resistant properties according to the present invention. Figure 2 This is an enlarged schematic diagram of the waterproof sealing ring of an embodiment of the extra-large slewing bearing for a marine deck crane with waterproof and corrosion-resistant properties according to the present invention. Figure 3 This is a half-section view of one embodiment of the extra-large slewing bearing for marine deck cranes with waterproof and corrosion-resistant properties according to the present invention. Figure 4 for Figure 3 Enlarged view of point A; Figure 5 This is a schematic diagram illustrating the waterproof sealing principle during use.

[0036] In the diagram: 1. Inner ring; 2. Upper outer ring; 3. Lower outer ring; 4. First roller; 5. Second roller; 6. Third roller; 7. Waterproof sealing ring; 8. Dustproof sealing ring; 9. Sealing plate; 10. Special-shaped sealing ring; 101. First special-shaped sealing ring; 102. Second special-shaped sealing ring; 11. Upper root portion; 12. Upper sealing lip; 13. Middle sealing lip; 14. Lower root portion; 15. Lower sealing lip; 16. Recess; 17. V-shaped annular groove structure; 18. Annular space; 19. Wear-resistant coating; 20. Upper grease sealing ring cavity; 21. Lower grease sealing ring cavity. Detailed Implementation

[0037] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0038] This invention proposes an extra-large slewing bearing for marine deck cranes with waterproof and corrosion-resistant properties, comprising an inner ring and an outer ring. Two irregularly shaped sealing rings with sealing lips are disposed between the inner and outer rings. Each irregularly shaped sealing ring includes one or at least two sealing lips, with at least two adjacent sealing lips forming a sealing annulus together with the side of the inner ring. The sealing annulus is filled with lubricating grease. This lubrication effectively prevents significant wear on the bearing rings caused by the sealing lips during bearing rotation, and the lubricating grease forms an oil film between the sealing lips, further enhancing the sealing effect.

[0039] Based on the above concept, the present invention provides various embodiments of extra-large slewing bearings for marine deck cranes with waterproof and corrosion-resistant properties for illustration.

[0040] In a basic embodiment, the extra-large slewing bearing for marine deck cranes with waterproof and corrosion-resistant properties of the present invention includes an inner ring 1 and an outer ring, both of which are provided with rolling elements. Two irregularly shaped sealing rings 10 with sealing lips are provided between the inner ring 1 and the outer ring. Each irregularly shaped sealing ring 10 includes one or at least two sealing lips, with at least two adjacent sealing lips forming a sealing annulus together with the side of the corresponding bearing ring. The sealing annulus is filled with lubricating grease. Filling the annulus with lubricating grease effectively prevents significant wear on the bearing rings caused by the sealing lips during bearing rotation. Furthermore, the lubricating grease can form an oil film between the sealing lips, further enhancing the sealing effect.

[0041] The waterproof and corrosion-resistant bearing of the present invention can be configured as a tapered roller bearing, a cylindrical roller bearing, or a deep groove ball bearing. The type of bearing can be changed according to the actual application, and the size of the bearing can be adjusted according to different working conditions and environments.

[0042] Based on the above embodiments, as follows Figure 1 ,3 Taking the three-row cylindrical roller bearing shown as an example, the three-row cylindrical roller bearing includes an inner ring 1 and an outer ring. The inner ring 1 is an integral ring, and the outer ring is set as an upper outer ring 2 and a lower outer ring 3 that are separately connected. A first roller 4, a second roller 5 and a third roller 6 are arranged between the inner ring 1 and the outer ring.

[0043] Two irregularly shaped sealing rings 10 with sealing lips are provided between the inner ring 1 and the outer ring of the three-row cylindrical roller bearing. The irregularly shaped sealing ring 10 includes one or at least two sealing lips. At least two adjacent sealing lips together with the side of the inner ring form a sealing annulus, which is filled with lubricating grease.

[0044] Based on the above embodiments, in one embodiment, only one irregular sealing ring 10 may be provided between the inner ring 1 and the outer ring. Two or three sealing lips are provided on the irregular sealing ring 10, and two adjacent sealing lips together form a sealing annular cavity, which is filled with lubricating grease. In another embodiment, two or three irregular sealing rings 10 are provided between the inner ring 1 and the outer ring. Each irregular sealing ring 10 may have only one sealing lip, and adjacent sealing lips of two adjacent irregular sealing rings together form the sealing annular cavity, which is filled with lubricating grease. In a preferred embodiment, such as... Figure 3-4 As shown, two irregular sealing rings 10 are provided between the inner ring 1 and the outer ring, namely the first irregular sealing ring 101 (upper irregular sealing ring) and the second irregular sealing ring 102 (lower irregular sealing ring). The second irregular sealing ring 102 is provided with two sealing lips, and the first irregular sealing ring 101 is provided with one sealing lip. Grease is filled between adjacent sealing lips. This arrangement can also reduce the friction between the sealing lips and the inner ring 1, and the structure is relatively simple.

[0045] Based on the above embodiments, the irregular sealing ring 10 can be disposed on the inner ring 1, with the sealing lip facing the outer ring. In a preferred embodiment, such as... Figure 1 , 3 As shown in Figure 4, the irregular sealing ring is installed on the lower outer ring 3. The lower end face of the lower outer ring 3 has a groove on the inner circumferential surface for placing the irregular sealing ring 10 so that the irregular sealing ring can be inserted from bottom to top. A sealing pressure plate 9 is also provided on the lower end face of the lower outer ring 3 for pressing the irregular sealing ring 10 from bottom to top. This arrangement can make the irregular sealing ring 10 more compact and the sealing effect better.

[0046] Specific examples Figure 4-5As shown, the aforementioned groove is provided on the lower end face of the outer sleeve near the inner circumferential surface. This groove is an annular groove, open on its radially inner and lower sides. Two irregularly shaped sealing rings are stacked from bottom to top and inserted into the annular groove. An annular sealing pressure plate is also connected to the lower end face of the outer sleeve to press the two stacked irregularly shaped sealing rings together from bottom to top. This groove structure and sealing ring installation method can achieve the installation of the sealing ring on the bearing race without causing the irregularly shaped sealing ring to be stretched or deformed. It can prevent the irregularly shaped sealing ring from deforming prematurely during installation, thus avoiding affecting the consistency of the sealing effect in the entire circumferential direction during subsequent use. Moreover, it facilitates the installation of irregularly shaped sealing rings.

[0047] like Figure 5 As shown, the upper irregular sealing ring includes an upper sealing lip 12 that extends radially inward from bottom to top, and a middle sealing lip 13 that is connected to the lower position of the upper sealing lip 12 and extends radially inward from top to bottom. The lower irregular sealing ring includes a lower sealing lip 15 that extends radially inward from top to bottom. The upper, middle and lower sealing lips are all sealed and fitted with the side of the inner ring. Each pair of adjacent sealing lips forms a grease sealing ring cavity filled with lubricating grease.

[0048] Thus, the upper sealing lip 12 and the middle sealing lip 13 form an annular cavity, and the middle sealing lip 13 and the lower sealing lip 15 form another annular cavity. Both annular cavities are filled with lubricating grease, thereby forming the upper grease sealing annular cavity 20 and the lower grease sealing annular cavity 21. The grease sealing annular cavity can both press against the sides of the inner ring through the two sealing lips forming the annular cavity, ensuring a seal based on the elasticity of the sealing lips themselves, and occupy the internal space of the annular cavity by the lubricating grease filling the annular cavity, preventing seawater from entering the annular cavity and ensuring a seal. At the same time, it can form an oil film between the sealing lips and the sides of the inner ring. The formation of the oil film can prevent seawater from adhering to the surface of the sealing lips and the sides of the inner ring, achieving effective water isolation, and also helps to reduce the friction between the sealing lips and the sides of the inner ring, reducing the wear of the sealing lips and promoting a seal.

[0049] The sealing lips of two irregularly shaped sealing rings cooperate to form two grease sealing ring cavities and three sealing lips, forming a five-fold seal with a relatively simple structure. Moreover, the sealing lips are alternately sealed by elastic compression force and sealed by grease barrier seal that is incompatible with water, resulting in high sealing reliability and a long effective sealing life.

[0050] Specifically, such as Figure 4As shown, both irregular sealing rings include an annular main body portion located within an annular groove and a sealing lip portion extending inward from the annular main body portion. The sealing pressure plate presses the annular main body portions of the two irregular sealing rings together from bottom to top. The sealing lip portion of the upper irregular sealing ring includes a root portion extending radially horizontally inward at the lower end of the annular main body portion, namely the upper root portion 11. The upper sealing lip 12 extends inward and upward from the radial inner end of the upper root portion 11. The sealing lip portion of the lower irregular sealing ring includes a root portion extending radially inward and upward near the upper end of the annular main body portion, namely the lower root portion 14. The lower sealing lip 15 extends inward and downward from the radial inner end of the lower root portion 14, and forms an annular groove structure 17 with the lower root portion 14 with a V-shaped cross section facing downward. There is an annular gap between the lower side surface of the upper root portion 11 and the upper side surface of the lower root portion 14 to avoid direct contact.

[0051] The two irregularly shaped sealing rings, using the aforementioned structure and mating configuration, when seawater surges upwards from the lower gap between the inner and outer rings, compressing the sealing lip portion of the irregularly shaped sealing rings, as... Figure 5 As shown, the inclined downward-facing V-shaped annular groove structure 17 formed by the sealing lip portion of the lower shaped sealing ring causes the sealing lip portion of the lower shaped sealing ring to expand radially inward under pressure. This allows more of the lower sealing lip 15 to adhere and press tightly against the side of the inner ring. This design, which tightens under pressure, effectively ensures the sealing capability of the lower sealing lip 15. Moreover, as the lower sealing lip 15 is pressed tighter, the oil pressure within the lower grease sealing ring cavity 21 formed by the lower sealing lip 15 and the middle sealing lip 13 increases, which helps resist external water pressure and also improves the sealing performance of the lower grease sealing ring cavity during this process.

[0052] Furthermore, an annular space 18 exists between the lower side of the upper root portion 11 and the upper side of the lower root portion 14, preventing direct contact between the two. Therefore, when the sealing lip of the lower profile sealing ring is impacted and compressed by seawater from below, causing it to deform radially inward around the lower root portion 14, it will not directly push against the sealing lip of the upper profile sealing ring from below, thus not affecting the sealing effect of the upper profile sealing ring's sealing lip. Additionally, the absence of direct contact between the lower side of the upper root portion and the upper side of the lower root portion also prevents the lubricating grease from adhering between them after direct contact, which would make them difficult to separate, affecting their elastic deformation capabilities and thus the sealing effect.

[0053] Furthermore, a recess 16 is provided radially inward at the root position where the lower sealing lip 15 connects to the lower root portion 14, so that the thickness at this position is reduced. With the above-mentioned thickness reduction design, when seawater surges upward from the lower end gap between the inner and outer rings and squeezes the sealing lip of the lower profile sealing ring, the lower sealing lip 15 is more likely to deform radially inward around its root, thereby reliably sealing with the outer circumferential surface of the inner ring.

[0054] Furthermore, the thickness of the middle sealing lip 13 is less than that of the upper sealing lip 12 and the lower sealing lip 15. This design avoids the middle sealing lip 13 having a stronger elasticity than the upper and lower sealing lips. When radial movement occurs between the inner and outer rings, the elastic deformation of the middle sealing lip 13 will squeeze the grease in one of the upper and lower sides of the grease sealing ring cavity outward, helping to reduce grease leakage from the grease sealing ring cavity. Moreover, when seawater surges upward from the lower gap between the inner and outer rings, squeezing the sealing lip of the lower shaped sealing ring and increasing the oil pressure in the lower grease sealing ring cavity 21 formed by the lower sealing lip 15 and the middle sealing lip 13, the middle sealing lip can also deform and fit more tightly against the outer side of the inner ring, enhancing the sealing effect.

[0055] Clearly, the above design achieves the effect of transmitting seawater pressure from bottom to top when seawater surges upward from the lower gap between the inner and outer rings and squeezes the sealing lip of the irregular sealing ring, thereby enhancing the sealing performance of the multiple sealing structures from bottom to top.

[0056] In addition, the inner end of the upper sealing lip 12 is thickened radially inward, which enhances the wear resistance of the upper sealing lip 12, extends the sealing life of the last seal, and helps to improve the effective sealing life of the entire slewing bearing.

[0057] Based on the above embodiments, the upper outer ring 2 and the lower outer ring 3 can be connected by bolts. Through-holes are made in the upper outer ring 2 and the lower outer ring 3, and then bolts are used to connect the upper outer ring 2 and the lower outer ring 3. In a preferred embodiment, as shown... Figure 1 , 3 As shown, the lower outer ring 3 has a screw blind hole, and the upper outer ring 2 has a connecting hole at the position corresponding to the screw blind hole. The upper outer ring 2 and the lower outer ring 3 are connected by a connecting screw, which can prevent the inner wall of the connecting hole and the screw blind hole from being exposed to the air and reduce the risk of corrosion.

[0058] Based on the above embodiments, in a preferred embodiment, such as Figure 1 , 3As shown, waterproof sealing rings 7 are provided at the joints where the bearing is connected to other components to prevent water from flowing into the bearing from the joint. At least one waterproof sealing ring 7 is also provided at the joint between the upper outer ring 2 and the lower outer ring 3 of the bearing to prevent water from flowing into the bearing from the joint between the upper outer ring 2 and the lower outer ring 3.

[0059] Specifically, such as Figure 1 , 3 As shown, the upper end face of the upper outer ring 2 is a connecting surface for bonding with other components, and a waterproof sealing ring 7 is provided on both the inner and outer radial sides of the connecting hole on the upper end face; the lower end face of the inner ring 1 is a connecting surface for bonding with other components, and a waterproof sealing ring 7 is provided on both the inner and outer radial sides of the connecting hole on the lower end face; a waterproof sealing ring 7 is provided at the connection between the upper outer ring 2 and the lower outer ring 3.

[0060] Preferred, such as Figure 2 As shown, the waterproof sealing rings 7 at these locations preferably use annular planes as the waterproof sealing rings that fit against the components on both sides. This increases the downward volume of the waterproof sealing ring 7 under pressure, improving the waterproof sealing performance, while reducing the twisting deformation of the waterproof sealing ring 7 during installation, making it easier to install. Specifically, for the waterproof sealing ring installed on the upper end face of the upper outer ring, the lower side of the waterproof sealing ring that contacts the bottom of the sealing ring mounting groove on the upper outer ring is an annular plane, and the upper side of the waterproof sealing ring has an annular plane in the middle for fitting against other components; for the waterproof sealing ring installed on the lower end face of the inner ring, the upper side of the waterproof sealing ring that contacts the bottom of the sealing ring mounting groove on the inner ring is an annular plane, and the lower side of the waterproof sealing ring has an annular plane in the middle for fitting against other components; for the waterproof sealing ring between the upper and lower outer rings, the waterproof sealing ring fits and seals against the upper and lower outer rings respectively through the annular planes on the upper and lower sides.

[0061] Based on the above embodiments, in a preferred embodiment, such as Figure 3 , 4 As shown, a wear-resistant coating 19 is sprayed on the inner ring 1 at the position corresponding to the sealing lip, so as to further prevent the inner ring 1 from being worn by the sealing lip on the irregular sealing ring 10.

[0062] The wear-resistant coating 19 can be a metallic wear-resistant coating 19, a non-metallic wear-resistant coating 19, a nano-wear-resistant coating 19, or a composite wear-resistant material. In a preferred embodiment, such as Figure 4 As shown, WC-10Co4Cr thermal spray powder is sprayed onto the inner ring 1 as a wear-resistant coating 19. After spraying, fine processing is performed to make the surface of the wear-resistant coating 19 smooth, so that the inner ring 1 can have both wear-resistant and corrosion-resistant properties.

[0063] Based on the above embodiments, in a preferred embodiment, all non-mounting surfaces of the bearing are sandblasted to Sa2.5 level, and then painted. This can effectively improve the bearing's resistance to mold, salt spray, and corrosion, making the bearing suitable for marine environments.

[0064] Based on the above embodiments, in a preferred embodiment, such as Figure 1 , 3 As shown, at the contact point between the inner ring 1 and the upper outer ring 2 of the bearing, a dustproof sealing ring 8 is provided on both the inner ring 1 and the upper outer ring 2 to prevent dust from entering the bearing and thus increasing internal friction and accelerating bearing wear.

[0065] In the above embodiments, the special-shaped sealing ring 10 is made of saturated rubber, and the waterproof sealing ring 7 and the dustproof sealing ring 8 are made of hydrogenated nitrile rubber. Both are also made of antifungal agents to ensure that the sealing rings can adapt to the marine environment and have anti-corrosion performance requirements.

[0066] When the above-mentioned three-row cylindrical roller bearings are used on a marine deck crane, the size of the first roller 4 is set to φ80×140, which can withstand a large axial force. The size of the second roller 5 is φ70×120, which can withstand a large overturning moment. The third roller 6 mainly bears the radial force.

[0067] Five waterproof sealing rings 7 are designed at three locations: the connection surface between the lower end face of the bearing and the flange, the connection point between the upper end face of the bearing and the flange, and the connection surface between the upper outer ring 2 and the lower outer ring 3 of the bearing, to prevent seawater from entering the bearing from each connection surface.

[0068] Between the inner ring 1 and the lower outer ring 3 of the bearing, two irregular sealing rings 10 are provided on the lower outer ring 3. The first irregular sealing ring 101 is mainly used to prevent seawater from entering the bearing. The second irregular sealing ring 102 prevents the grease inside the bearing from leaking out and also provides some barrier to the seawater from the outside. The inner ring 1 is sprayed with WC-10Co4Cr thermal spray powder as a wear-resistant coating 19 at the position opposite to the irregular sealing ring 10, and grease is also filled between each adjacent sealing lip. This prevents the inner ring 1 from being worn by the sealing lip, and the grease can form an oil film to further improve the waterproof sealing performance.

[0069] In this invention, the special-shaped sealing ring 10 is made of saturated rubber, and the waterproof sealing ring 7 and dustproof sealing ring 8 are both made of hydrogenated nitrile rubber. Furthermore, antifungal agents are added to all sealing materials to ensure the bearing can adapt to marine environments and meet corrosion resistance requirements. Simultaneously, the lower outer ring 3 of the bearing has blind screw holes, and the upper outer ring 2 has connecting holes corresponding to these holes. The upper outer ring 2 and lower outer ring 3 are connected by connecting screws. All non-mounting surfaces of the bearing are sandblasted to Sa2.5 grade before being painted for corrosion protection, thus giving the bearing corrosion resistance.

[0070] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A large slewing bearing for marine deck cranes with waterproof and corrosion-resistant properties, comprising an inner ring and an outer ring, wherein the inner ring is an integral ring, and the outer ring comprises a separate upper outer ring and a lower outer ring, characterized in that, Two irregularly shaped sealing rings with sealing lips are stacked and installed on the lower end face of the outer ring near the inner side. The upper irregularly shaped sealing ring includes an upper sealing lip that extends radially inward from bottom to top, and a middle sealing lip that is connected to the lower position of the upper sealing lip and extends radially inward from top to bottom. The lower irregularly shaped sealing ring includes a lower sealing lip that extends radially inward from top to bottom. The upper, middle and lower sealing lips are all sealed and fitted with the side of the inner ring. Each pair of adjacent sealing lips forms a sealing annular cavity filled with lubricating grease to form a grease sealing annular cavity.

2. The extra-large slewing bearing for marine deck cranes with waterproof and corrosion-resistant properties according to claim 1, characterized in that, The lower outer ring has an annular groove on its lower end face near the inner circumference. The radial inner side and lower side of the annular groove are open. The upper and lower irregular sealing rings are stacked from bottom to top and inserted into the annular groove. The lower end face of the lower outer ring is also connected to an annular sealing pressure plate to press the two stacked irregular sealing rings together from bottom to top.

3. The extra-large slewing bearing for marine deck cranes with waterproof and corrosion-resistant properties according to claim 2, characterized in that, Both irregularly shaped sealing rings include an annular main body portion within an annular groove and a sealing lip portion extending inward from the annular main body portion. The sealing pressure plate presses the annular main body portions of the two irregularly shaped sealing rings together from bottom to top. The sealing lip portion of the upper irregularly shaped sealing ring includes a root portion extending radially horizontally inward at the lower end of the annular main body portion. The upper sealing lip extends inwardly and upward from the radially inner end of the root portion. The sealing lip portion of the lower irregularly shaped sealing ring includes a root portion extending radially inwardly and upward near the upper end of the annular main body portion. The lower sealing lip extends inwardly and downward from the radially inner end of the root portion, forming an annular groove structure with a V-shaped cross-section facing downward with the root portion. There is an annular space between the lower side of the root portion of the sealing lip portion of the upper irregularly shaped sealing ring and the upper side of the root portion of the sealing lip portion of the lower irregularly shaped sealing ring to avoid direct contact.

4. The extra-large slewing bearing for marine deck cranes with waterproof and corrosion-resistant properties according to claim 3, characterized in that, The lower sealing lip has a recess on the radially inner side of the root position where it connects to the root portion, so that the thickness at that position is reduced.

5. The extra-large slewing bearing for marine deck cranes with waterproof and corrosion-resistant properties according to any one of claims 1-4, characterized in that, The thickness of the middle sealing lip is less than the thickness of the upper and lower sealing lips.

6. The extra-large slewing bearing for marine deck cranes with waterproof and corrosion-resistant properties according to any one of claims 1-4, characterized in that, The inner end of the upper sealing lip is thickened radially inward.

7. The extra-large slewing bearing for marine deck cranes with waterproof and corrosion-resistant properties according to any one of claims 1-4, characterized in that, A wear-resistant coating is sprayed onto the outer circumference of the inner ring at the position corresponding to the sealing lips of the upper and lower irregular sealing rings. The surface of the wear-resistant coating is smooth.

8. The extra-large slewing bearing for marine deck cranes with waterproof and corrosion-resistant properties according to any one of claims 2-4, characterized in that, The lower outer ring has blind screw holes, and the upper outer ring has connecting holes at the corresponding positions of the blind screw holes. The upper and lower outer rings are connected by connecting screws.

9. The extra-large slewing bearing for marine deck cranes with waterproof and corrosion-resistant properties according to any one of claims 2-4, characterized in that, The upper end face of the outer sleeve is a connecting surface for bonding with other components. Waterproof sealing rings are provided on the inner and outer sides of the connecting hole on the upper end face. The lower side of the waterproof sealing ring that contacts the bottom of the sealing ring mounting groove on the outer sleeve is an annular plane. The upper side of the waterproof sealing ring has an annular plane in the middle for bonding with other components.

10. The extra-large slewing bearing for marine deck cranes with waterproof and corrosion-resistant properties according to any one of claims 2-4, characterized in that, The lower end face of the inner ring is a connecting surface for bonding with other components. Waterproof sealing rings are provided on the inner and outer sides of the connecting hole on the lower end face. The upper side of the waterproof sealing ring that contacts the bottom of the sealing ring mounting groove on the inner ring is an annular plane. The lower side of the waterproof sealing ring has an annular plane in the middle for bonding with other components.

11. The extra-large slewing bearing for marine deck cranes with waterproof and corrosion-resistant properties according to claim 2, characterized in that, At least one waterproof sealing ring is provided at the connection between the upper outer ring and the lower outer ring, and the waterproof sealing ring is respectively sealed to the upper and lower outer rings through the annular plane.

12. The extra-large slewing bearing for marine deck cranes with waterproof and corrosion-resistant properties according to any one of claims 1-4, characterized in that, The non-mounting surface of the bearing is sandblasted and covered with an anti-corrosion paint layer.

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