Slewing bearing for marine crane

Abstract

The utility model discloses a slewing bearing for a marine crane, which comprises an outer ring, an inner ring, an upper rolling body and a lower rolling body, the outer ring is axially provided with a placing groove, the inner ring is arranged in the placing groove, a clamping groove is arranged between the top surface of the outer ring and the top surface of the inner ring, the inner side of the outer ring is provided with an outer ring upper groove and an outer ring lower groove, and the outer ring upper groove and the outer ring lower groove are arranged in the clamping groove. An inner ring upper groove and an inner ring lower groove are formed in the outer side of the inner ring, an upper channel is formed between the outer ring upper groove and the inner ring upper groove, a lower channel is formed between the outer ring lower groove and the inner ring lower groove, the upper channel and the lower channel are vertically and correspondingly arranged at intervals, the upper rolling body is arranged in the upper channel in a rolling mode, and the lower rolling body is arranged in the lower channel in a rolling mode. A plurality of upper oil holes and a plurality of lower oil holes are evenly distributed in the outer ring in the circumferential direction, installation teeth are arranged on the inner side of the inner ring, and a limiting groove is formed in the outer side of the outer ring. The utility model can bear larger axial and radial loads and overturning moment at the same time, has higher safety coefficient, solves the problem of jamming in the working process, runs smoothly, and is convenient to install and use.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery, in particular to a slewing bearing for a marine crane. Background Art

[0002] Marine cranes, also known as ship cranes, are devices and machinery used for loading and unloading cargo on ships, mainly including boom devices, deck cranes and other loading and unloading machinery. Marine cranes are special cranes that perform transportation operations in a marine environment, mainly used for important tasks such as the transportation and transfer of cargo between ships, marine replenishment, and the deployment and recovery of underwater operating equipment.

[0003] The traditional marine crane slewing bearing has only a single row of rolling elements, which makes it unable to bear large working loads and overturning moments at the same time, and has a low safety factor. To address this problem, a slewing bearing with double rows of rolling elements of the same diameter has been developed. Although the slewing bearing can bear large working loads and overturning moments, the outer ring of the slewing bearing is only provided with an upper oil hole connected to the upper channel and a lower oil hole connected to the lower channel along its circumference. The circumference of the marine crane slewing bearing is large, so the lubricating oil cannot be evenly distributed in the upper channel and the lower channel in time. As a result, it is easy to cause jamming during operation due to the lubricant not playing a lubricating role in time, resulting in unsmooth operation. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a slewing bearing for a marine crane in view of the deficiencies in the above-mentioned prior art.

[0005] In order to solve the above technical problems, the technical solution of the utility model is:

[0006] A slewing bearing for a marine crane comprises an outer ring, an inner ring, an upper rolling body and a lower rolling body, wherein the outer ring is axially provided with a placement groove for placing the inner ring, the inner ring is placed in the placement groove, a clamping groove for matching with the middle part of the marine crane is arranged between the top surface of the outer ring and the top surface of the inner ring, an outer ring upper groove and an outer ring lower groove are arranged on the inner side of the outer ring, an inner ring upper groove and an inner ring lower groove are arranged on the outer side of the inner ring, an upper channel is formed between the outer ring upper groove and the inner ring upper groove, and a channel is formed between the outer ring lower groove and the inner ring lower groove A lower channel is formed, the upper channel and the lower channel are arranged at corresponding intervals up and down, the upper rolling body is rollingly arranged in the upper channel, the lower rolling body is rollingly arranged in the lower channel, the outer ring is circumferentially evenly provided with a plurality of upper oil holes connected with the upper channel, the outer ring is circumferentially evenly provided with a plurality of lower oil holes connected with the lower channel, the upper oil holes and the lower oil holes are staggered, the inner side of the inner ring is provided with mounting teeth for assembly with a ship crane, and the outer side of the outer ring is provided with a limiting groove for cooperating with the edge of the ship crane.

[0007] As a preferred solution, the diameter of the upper rolling body is the same as the diameter of the lower rolling body.

[0008] As a preferred solution, the outer ring is evenly provided with outer ring mounting holes along the circumference, and the angle between two adjacent outer ring mounting holes is 15°; the inner ring is evenly provided with inner ring mounting holes along the circumference, and the angle between two adjacent inner ring mounting holes is 12°.

[0009] As a preferred solution, a first through hole is radially arranged in the outer ring for the upper rolling body to enter the upper channel, and an upper insert block with a shape matching the first through hole is arranged in the first through hole.

[0010] As a preferred solution, a second through hole is radially arranged in the outer ring for the lower rolling body to enter the lower channel, and a lower insert block with a shape matching the second through hole is arranged in the second through hole.

[0011] As a preferred solution, the angle between the center line of the first through hole and the center line of the second through hole is 15°.

[0012] As a preferred solution, the axial clearance between the outer ring and the inner ring and the radial clearance between the outer ring and the inner ring are both 0.06-0.14 mm.

[0013] As a preferred embodiment, the slewing bearing for the marine crane further includes an upper sealing ring and a lower sealing ring, an upper sealing groove is provided on the inner side of the outer ring, the upper sealing ring is installed in the upper sealing groove, the upper sealing ring abuts against the inner ring, a lower sealing groove is provided on the outer side of the inner ring, the lower sealing ring is installed in the lower sealing groove, and the lower sealing ring abuts against the outer ring.

[0014] As a preferred solution, the angle between two adjacent upper oil holes and the angle between two adjacent lower oil holes are both 90°.

[0015] As a preferred solution, the material of the inner ring and the outer ring are both 42CrMo, and the hardness of the outer ring and the inner ring is 220-269HB.

[0016] The beneficial effects of the utility model are as follows: the upper channel and the lower channel are arranged at intervals corresponding to each other, the upper rolling body is arranged in the upper channel in a rolling manner, and the lower rolling body is arranged in the lower channel in a rolling manner. Such a structural arrangement enables the slewing bearing for a marine crane to simultaneously withstand larger axial and radial loads and overturning moments, and has a higher safety factor; the outer ring is evenly distributed with a plurality of upper oil holes connected to the upper channel in the circumferential direction, and the outer ring is evenly distributed with a plurality of lower oil holes connected to the lower channel in the circumferential direction, and the upper oil holes and the lower oil holes are arranged in an alternating manner, so that the lubricating oil can be more quickly dissipated. The speed is more evenly distributed in the upper channel and the lower channel, thereby effectively solving the problem of easy jamming during use and making the slewing bearing for marine crane run more smoothly; a clamping groove for matching with the middle part of the marine crane is arranged between the top surface of the outer ring and the top surface of the inner ring, and a limiting groove for matching with the surrounding edge of the marine crane is arranged on the outer side of the outer ring. During the installation process, the middle part of the marine crane extends into the clamping groove, and the surrounding edge of the marine crane is clamped into the limiting groove, so that the slewing bearing for marine crane and the marine crane can be positioned faster, the installation efficiency is improved, and it is more convenient for users to install and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A top view of a slewing bearing for a marine crane in one embodiment of the utility model;

[0018] Figure 2 for Figure 1 Cross-sectional view of the AA section;

[0019] Figure 3 For Figure 2 The assembly structure diagram of the outer ring, inner ring, upper rolling element, lower rolling element, upper sealing ring and lower sealing ring shown;

[0020] Figure 4 for Figure 1 Cross-sectional view of the middle BB part;

[0021] Figure 5 for Figure 1 Cross-sectional view of the CC section;

[0022] Figure 6 for Figure 1 Cross-sectional view of the middle DD part;

[0023] Figure 7 for Figure 1 Cross-sectional view of the EE part.

[0024] In the figure:

[0025] 100-Slewing bearing for marine crane;

[0026] 10-outer ring, 11-upper groove of outer ring, 12-lower groove of outer ring, 13-mounting hole of outer ring, 14-upper oil nozzle, 15-lower oil nozzle, 16-upper insert, 17-lower insert, 18-card slot, 19-limiting slot;

[0027] 20-inner ring, 21-inner ring upper groove, 22-inner ring lower groove, 23-mounting teeth, 24-inner ring mounting hole;

[0028] 30-upper rolling element;

[0029] 40-lower rolling element;

[0030] 50-upper sealing ring;

[0031] 60-Lower sealing ring. DETAILED DESCRIPTION

[0032] The structural principle and working principle of the utility model are further described in detail below with reference to the accompanying drawings.

[0033] like Figures 1 to 7 As shown, a slewing bearing 100 for a marine crane comprises an outer ring 10, an inner ring 20, an upper rolling body 30 and a rolling body 40. The outer ring 10 is axially provided with a placement groove for placing the inner ring 20, and the inner ring 20 is placed in the placement groove. The inner side of the outer ring 10 is provided with an outer ring upper groove 11 and an outer ring lower groove 12, and the outer side of the inner ring 20 is provided with an inner ring upper groove 21 and an inner ring lower groove 22. An upper channel adapted to the upper rolling body 30 is formed between the outer ring upper groove 11 and the inner ring upper groove 21, and a lower channel adapted to the lower rolling body 40 is formed between the outer ring lower groove 12 and the inner ring lower groove 22. The upper channel and the lower channel are arranged at corresponding intervals, the upper rolling body 30 is rollingly arranged in the upper channel, and the lower rolling body 40 is rollingly arranged in the lower channel. Such a structural arrangement enables the slewing bearing 100 for a marine crane to simultaneously withstand larger axial and radial loads and overturning moments, and has a higher safety factor.

[0034] As a preferred solution, a mounting groove 18 for matching with the middle part of the ship crane is provided between the top surface of the outer ring 10 and the top surface of the inner ring 20, and a limiting groove 19 for matching with the surrounding edge of the ship crane is provided on the outer side of the outer ring 10. During the installation process, the middle part of the ship crane extends into the mounting groove 18, and the surrounding edge of the ship crane is inserted into the limiting groove 19, so that the slewing bearing 100 for the ship crane and the ship crane can be positioned more quickly, thereby improving the installation efficiency. The depth of the mounting groove 18 is 19.9-20.1 mm, and the depth of the limiting groove 19 is 10 mm. During installation, the depth of the middle part of the ship crane inserted into the mounting groove 18 is 16 mm.

[0035] As a preferred solution, the outer ring 10 is provided with an upper oil hole connected to the upper channel, the number of the upper oil holes is multiple, the multiple upper oil holes are evenly distributed along the circumference of the outer ring 10, the angle between two adjacent upper oil holes is 90°, and each upper oil hole is correspondingly provided with an upper oil nozzle 14. In this way, the lubricating oil can enter the upper channel more evenly.

[0036] As a preferred solution, the outer ring 10 is provided with a lower oil hole connected to the lower channel. The number of the lower oil holes is multiple, and the multiple lower oil holes are evenly distributed along the circumference of the outer ring 10. The angle between two adjacent lower oil holes is 90°, and each lower oil hole is correspondingly provided with a lower oil nozzle 15. In this way, the lubricating oil can enter the lower channel more evenly. The upper oil holes and the lower oil holes are staggered, so as to effectively solve the problem of easy jamming during use, so that the slewing bearing 100 for the marine crane can run more smoothly.

[0037] As a preferred embodiment, the slewing bearing 100 for a marine crane further includes an upper sealing ring 50 and a lower sealing ring 60. An upper sealing groove is provided on the inner side of the outer ring 20, and the upper sealing groove is provided in the clamping groove 18. The upper sealing ring 50 is installed in the upper sealing groove. The upper sealing ring 50 abuts against the inner ring 20. A lower sealing groove is provided on the outer side of the inner ring 20, and the lower sealing ring 60 is installed in the lower sealing groove. The lower sealing ring 60 abuts against the outer ring 10, which effectively improves the sealing performance and effectively avoids the phenomenon of blockage inside the slewing bearing 100 for a marine crane due to external dirt entering the interior of the slewing bearing 100, thereby extending the service life of the slewing bearing 100 for a marine crane.

[0038] As a preferred solution, the groove depth of the upper sealing groove and the lower sealing groove is 8mm, and the groove width of the upper sealing groove and the lower sealing groove is 3.9-4.1mm. The upper sealing ring 50 and the lower sealing ring 60 are both sealing strips of model WT17A, which have stronger sealing performance.

[0039] As a preferred solution, the inner side of the inner ring 20 is provided with mounting teeth 23 for assembly with the ship crane. The mounting teeth 23 can make the inner ring 20 and the ship crane be assembled more tightly.

[0040] As a preferred solution, the material of the inner ring 20 and the outer ring 10 are both 42CrMo, and the hardness of the outer ring 10 and the inner ring 20 is 220-269HB, which effectively improves the mechanical strength of the slewing bearing 100 for the marine crane, effectively improves the bearing capacity of the slewing bearing, and thus effectively extends the service life of the slewing bearing; at the same time, it can effectively improve the corrosion resistance of the slewing bearing, thereby facilitating user maintenance.

[0041] As a preferred solution, the diameter of the upper rolling body 30 is the same as the diameter of the lower rolling body 40, and the diameter of the upper rolling body 30 and the lower rolling body 40 is 17.463 mm, so that the slewing bearing 100 for the marine crane is more evenly stressed.

[0042] As a preferred embodiment, the outer ring 10 is evenly provided with outer ring mounting holes 13 in the circumferential direction, and the angle between two adjacent outer ring mounting holes 13 is 15°; the inner ring 20 is evenly provided with inner ring mounting holes 24 in the circumferential direction, and the angle between two adjacent inner ring mounting holes 24 is 12°, and the opening direction of the outer ring mounting holes 13 is opposite to the opening direction of the inner ring mounting holes 24.

[0043] As a preferred solution, the outer ring 10 is provided with a first through hole in the radial direction for the upper rolling body 30 to enter the upper channel, and an upper insert 16 with a shape matching the first through hole is provided in the first through hole.

[0044] As a preferred solution, the outer ring 10 is radially provided with a second through hole for the lower rolling body 40 to enter the lower channel, and the second through hole is provided with a lower insert 17 whose shape matches the second through hole.

[0045] As a preferred solution, the angle between the center line of the first through hole and the center line of the second through hole is 15°.

[0046] As a preferred solution, the axial clearance between the outer ring 10 and the inner ring 20 and the radial clearance between the outer ring 10 and the inner ring 20 are both 0.06-0.14 mm, with high manufacturing precision, which effectively improves the operational flexibility of the slewing bearing 100 for the ship crane.

[0047] The beneficial effects of the utility model are as follows: the upper channel and the lower channel are arranged at intervals corresponding to each other, the upper rolling body 30 is arranged in the upper channel in a rolling manner, and the lower rolling body 40 is arranged in the lower channel in a rolling manner. Such a structural arrangement enables the slewing bearing 100 for a marine crane to simultaneously withstand larger axial and radial loads and overturning moments, and has a higher safety factor; the outer ring 10 is evenly distributed with a plurality of upper oil holes connected to the upper channel in a circumferential direction, and the outer ring 10 is evenly distributed with a plurality of lower oil holes connected to the lower channel in a circumferential direction, and the upper oil holes and the lower oil holes are arranged in an alternating manner, so that the lubricating oil can be more evenly distributed. The outer ring 10 is provided with a clamping groove 18 for matching with the middle part of the marine crane, and the outer side of the outer ring 10 is provided with a limiting groove 19 for matching with the surrounding edge of the marine crane. During the installation process, the middle part of the marine crane extends into the clamping groove 18, and the surrounding edge of the marine crane is clamped into the limiting groove 19, so that the slewing bearing 100 for the marine crane can be positioned faster with the marine crane, the installation efficiency is improved, and it is more convenient for users to install and use.

[0048] The above is only a preferred embodiment of the present invention. Any slight modification, equivalent changes and modifications made to the above embodiments according to the technical solution of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A slewing bearing for a marine crane, characterized in that: It comprises an outer ring, an inner ring, an upper rolling body and a lower rolling body, wherein the outer ring is axially provided with a placement groove for placing the inner ring, the inner ring is placed in the placement groove, a clamping groove for matching with the middle part of the marine crane is arranged between the top surface of the outer ring and the top surface of the inner ring, an outer ring upper groove and an outer ring lower groove are arranged on the inner side of the outer ring, an inner ring upper groove and an inner ring lower groove are arranged on the outer side of the inner ring, an upper channel is formed between the outer ring upper groove and the inner ring upper groove, and a lower channel is formed between the outer ring lower groove and the inner ring lower groove, The upper channel and the lower channel are arranged at corresponding intervals up and down, the upper rolling body is rollingly arranged in the upper channel, and the lower rolling body is rollingly arranged in the lower channel. The outer ring is circumferentially evenly provided with a plurality of upper oil holes connected with the upper channel, and the outer ring is circumferentially evenly provided with a plurality of lower oil holes connected with the lower channel, and the upper oil holes are staggered with the lower oil holes. The inner side of the inner ring is provided with mounting teeth for assembly with a ship crane, and the outer side of the outer ring is provided with a limiting groove for cooperating with the edge of the ship crane.

2. The slewing bearing for a marine crane according to claim 1, characterized in that: The diameter of the upper rolling body is the same as the diameter of the lower rolling body.

3. The slewing bearing for a marine crane according to claim 1, characterized in that: The outer ring is evenly provided with outer ring mounting holes along the circumference, and the angle between two adjacent outer ring mounting holes is 15°; the inner ring is evenly provided with inner ring mounting holes along the circumference, and the angle between two adjacent inner ring mounting holes is 12°.

4. The slewing bearing for a marine crane according to claim 1, characterized in that: The outer ring is provided with a first through hole in the radial direction for the upper rolling body to enter the upper channel, and an upper insert block with a shape matching the first through hole is provided in the first through hole.

5. The slewing bearing for a marine crane according to claim 4, characterized in that: The outer ring is provided with a second through hole in the radial direction for the lower rolling body to enter the lower channel, and a lower insert block with a shape matching the second through hole is provided in the second through hole.

6. The slewing bearing for a marine crane according to claim 5, characterized in that: An angle formed between a center line of the first through hole and a center line of the second through hole is 15°.

7. The slewing bearing for a marine crane according to claim 6, characterized in that: The axial clearance between the outer ring and the inner ring and the radial clearance between the outer ring and the inner ring are both 0.06-0.14 mm.

8. The slewing bearing for a marine crane according to claim 1, characterized in that: It also includes an upper sealing ring and a lower sealing ring, wherein an upper sealing groove is arranged on the inner side of the outer ring, the upper sealing ring is installed in the upper sealing groove, the upper sealing ring abuts against the inner ring, and a lower sealing groove is arranged on the outer side of the inner ring, the lower sealing ring is installed in the lower sealing groove, and the lower sealing ring abuts against the outer ring.

9. The slewing bearing for a marine crane according to claim 1, characterized in that: The angle between two adjacent upper oil holes and the angle between two adjacent lower oil holes are both 90°.

10. The slewing bearing for a marine crane according to claim 1, characterized in that: The material of the inner ring and the outer ring is 42CrMo, and the hardness of the outer ring and the inner ring is 220-269HB.

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