Novel three-row roller type slewing bearing for large-tonnage crane

Abstract

The invention relates to a novel three-row roller type slewing bearing for a large-tonnage crane, and belongs to the technical field of supporting bearings, the novel three-row roller type slewing bearing comprises an inner ring, an outer ring and rollers, the three rows of rollers are two rows of axial rollers and one row of radial rollers, the radial rollers are located between the two rows of axial rollers, and the outer ring is located between the inner ring and the outer ring. Three raceways are formed in the inner ring surface of the outer ring at intervals, two raceways are formed in the outer ring surface of the inner ring and correspond to the two raceways on the outermost side of the outer ring to form a complete raceway, the axial roller is located in the complete raceway, the radial roller is located in the middle raceway of the outer ring, and the peripheral wall of the radial roller abuts against the inner ring. The slewing bearing has the effect of improving the bearing capacity of the slewing bearing.

Description

Technical Field

[0001] The present application relates to the technical field of support bearings, and in particular to a novel three-row roller slewing bearing for large-tonnage cranes. Background Art

[0002] At present, large-tonnage cranes generally use three-row roller slewing bearings, such as Figure 1 As shown in the figure, the three-row roller slewing bearing consists of three rows of rollers, inner, middle and outer, one outer gear ring and two inner gear rings. This structure allows the load of each row of rollers to be accurately determined, so it can bear various loads at the same time, including axial force, radial force and overturning moment. It has a simple structure, large load-bearing capacity, stable rotation and long service life. In the three-row roller slewing bearing, two rows of axial rollers bear axial force and overturning moment, and one row of radial rollers bears radial force. Because it has three seat rings, the upper and lower and radial raceways are separated, which is particularly suitable for heavy machinery requiring a larger diameter.

[0003] However, in order to improve the load-bearing capacity of the slewing bearing, the slewing center diameter needs to be appropriately increased, but the crane has width restrictions, which makes it difficult to improve the load-bearing capacity of the slewing bearing while maintaining the existing specifications. Summary of the invention

[0004] In order to improve the load-bearing capacity of a slewing bearing, the present application provides a novel three-row roller slewing bearing for a large-tonnage crane.

[0005] The present application provides a new type of three-row roller slewing bearing for a large-tonnage crane, which adopts the following technical solution: A new type of three-row roller slewing bearing for a large-tonnage crane comprises an inner ring, an outer ring and rollers, wherein the rollers are arranged in three rows, and the rollers are two rows of axial rollers and one row of radial rollers, wherein the radial rollers are located between the two rows of axial rollers, and the inner ring surface of the outer ring is provided with three raceways at intervals, and the outer ring surface of the inner ring is provided with three raceways which correspond to the raceways of the outer ring and are combined into a complete raceway (5), wherein the axial rollers are located in the complete raceway, and the radial rollers are located in the middle raceway of the outer ring and the peripheral wall abuts against the inner ring.

[0006] Optionally, a segmented cage is also included, and the rollers are located in the segmented cage for isolation.

[0007] Optionally, an upper ring groove is formed on the outer ring surface of the inner ring which is higher than the upper plane of the outer ring and a first sealing strip is provided, and a lower ring groove is formed on the inner ring surface of the outer ring which is lower than the lower plane of the inner ring and a second sealing strip is provided, the first sealing strip and the second sealing strip abut against each other, and a lower ring groove is formed on the inner ring surface of the outer ring which is lower than the lower plane of the inner ring and a third sealing strip is provided.

[0008] Optionally, an upper ring groove is formed on the inner ring surface of the outer ring which is higher than the upper plane of the inner ring and a fourth sealing strip is provided, and a lower ring groove is formed on the outer ring surface of the inner ring which is lower than the lower plane of the outer ring and a fifth sealing strip is provided, the fourth sealing strip and the fifth sealing strip abut against each other, and a lower ring groove is formed on the inner ring surface of the outer ring which is lower than the lower plane of the inner ring and a sixth sealing strip is provided.

[0009] Optionally, a pin hole is provided on a side wall of the outer ring that is lower than the lower plane of the inner ring, and the pin hole is axially opened.

[0010] Optionally, a pin hole is provided on a side wall of the inner ring that is lower than a lower plane of the outer ring, and the pin hole is axially opened.

[0011] Optionally, the inner ring includes an upper inner ring and a lower inner ring, which are connected to each other, and the upper inner ring and the lower inner ring are fixedly connected by screws.

[0012] Optionally, the outer ring includes an upper outer ring and a lower outer ring, which are connected to each other, and the upper outer ring and the lower outer ring are fixedly connected by screws.

[0013] Optionally, the outer ring is connected to the base connecting seat at the bottom of the crane by using a pin shaft through a pin hole, and the inner ring is connected to the rotating platform at the top of the crane by passing bolts through the mounting hole.

[0014] Optionally, the inner ring is connected to the base connecting seat at the bottom of the crane by using a pin shaft through a pin hole, and the outer ring is connected to the rotating platform at the top of the crane by passing bolts through the mounting hole.

[0015] In summary, the present application includes at least one of the following beneficial technical effects: 1. The radial roller is located in the middle raceway of the outer ring and the peripheral wall is in contact with the inner ring. Compared with the radial roller located in the inner ring, the diameter of the axial and radial roller rolling channels is increased, thereby increasing the number of additional axial and radial rollers, thereby improving the bearing capacity of the slewing bearing; and only the position of the raceway is changed to improve the bearing capacity of the slewing bearing, which has the advantages of low manufacturing cost and easy mass production; 2. The mounting holes of the outer ring or inner ring in the existing three-row roller slewing bearing are adjusted to pin holes, and the outer ring or inner ring is connected to the base using a pin shaft, so that the outer ring or inner ring and the base can be frequently assembled and disassembled. At the same time, the radial raceway is an embedded raceway, which has a compact structure and can further improve the bearing capacity of the slewing bearing under the same maximum outer diameter; 3. The radial raceway is an embedded raceway with a compact structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the related technology; Figure 2 is a schematic diagram of the structure of embodiment 1 with gears; Figure 3 is a schematic diagram of the structure of Embodiment 1 without gears; Figure 4 It is a cross-sectional view of an axially segmented cage in a novel three-row roller slewing bearing for a large-tonnage crane according to an embodiment of the present application; Figure 5 It is a cross-sectional view of a radially segmented cage in a novel three-row roller slewing bearing for a large-tonnage crane according to an embodiment of the present application; Figure 6 is a schematic diagram of the structure of Embodiment 2 without gears; Figure 7 It is a schematic diagram of the connection between a new three-row roller slewing bearing for a large-tonnage crane and a crane according to an embodiment of the present application.

[0017] Explanation of the reference numerals: 1. inner ring; 111. upper inner ring; 112. lower inner ring; 2. outer ring; 211. upper outer ring; 212. lower outer ring; 3. axial roller; 4. radial roller; 5. raceway; 6. segmented retaining cage; 7. first sealing strip; 8. second sealing strip; 9. third sealing strip; 10. pin hole; 11. pin shaft; 12. base connecting seat; 14. screw; 15. fourth sealing strip; 16. fifth sealing strip; 17. sixth sealing strip; 18. mounting hole; 19. gear. DETAILED DESCRIPTION

[0018] The following is combined with Figure 2-7 This application is described in further detail.

[0019] Example 1 Reference Figure 2 and Figure 3 The new three-row roller slewing bearing for large-tonnage cranes comprises an inner ring 1, an outer ring 2 and rollers. The rollers are arranged in three rows, and the rollers are two rows of axial rollers 3 and one row of radial rollers 4. The radial rollers 4 are located between the two rows of axial rollers 3. The inner ring surface of the outer ring 2 is provided with three raceways 5 at intervals. The outer ring surface of the inner ring 1 is provided with three raceways 5 and they are combined into a complete raceway 5 corresponding to the raceways 5 of the outer ring 2. The axial rollers 3 are located in the complete raceway 5, and the radial rollers 4 are located in the middle raceway 5 of the outer ring 2, and the peripheral wall abuts against the inner ring 1; the radial rollers 4 are located in the middle raceway 5 of the outer ring 2, and the peripheral wall abuts against the inner ring 1. Compared with the radial rollers 4 located in the inner ring 1, the diameter of the rolling flow channel of the radial rollers 4 is increased, thereby increasing the number of additional radial rollers 4, and then improving the bearing capacity of the slewing bearing; and only the position of the raceway 5 is changed to improve the bearing capacity of the slewing bearing, which has the advantages of low manufacturing cost and easy mass production.

[0020] Reference Figure 4 and Figure 5In order to improve the stability of the roller in the raceway 5 and improve the smoothness of the roller rolling in the raceway 5, a segmented cage 6 is also included, and the roller is located in the segmented cage 6 for isolation.

[0021] Reference Figure 2 and Figure 3 Furthermore, in the embodiment of the present application, an upper annular groove is formed on the outer annular surface of the inner ring 1 which is higher than the upper plane of the outer ring 2 and a first sealing strip 7 is provided, and a lower annular groove is formed on the inner annular surface of the outer ring 2 which is lower than the lower plane of the inner ring 1 and a second sealing strip 8 is provided, the first sealing strip 7 and the second sealing strip 8 abut against each other, and the lower side of the first sealing strip 7 abuts against the upper side of the second sealing strip 8, thereby improving the sealing between the inner ring 1 and the outer ring 2, thereby reducing the possibility of impurities and the like entering the interior of the slewing bearing through the above-mentioned gap, and further, a lower annular groove is formed on the inner annular surface of the outer ring 2 which is lower than the lower plane of the inner ring 1 and a third sealing strip 9 is provided, and under the action of the third sealing strip 9, the gap between the outer ring 2 and the lower side of the inner ring 1 is sealed, thereby reducing the possibility of impurities entering the slewing bearing.

[0022] Reference Figure 2 , Figure 3 and Figure 7 In order to facilitate the connection between the slewing bearing and the crane, a pin hole 10 is provided on the side wall of the outer ring 2 which is lower than the lower plane of the inner ring 1. The pin hole 10 is opened axially, and the outer ring 2 is connected to the base connecting seat 12 at the bottom of the crane through the pin hole 10 using a pin shaft 11; the slewing bearing is hoisted onto the crane and dropped onto the base connecting seat 12 of the crane, and then the pin shaft 11 passes through the base connecting seat 12 and the outer ring 2 to connect the slewing bearing and the crane, which is simple and convenient to operate; compared with the existing three-row roller slewing bearing, the outer ring 2 can be frequently assembled and disassembled with the base, which is convenient for the disassembly and transfer of the crane.

[0023] Reference Figure 2 and Figure 3 In the embodiment of the present application, the inner ring 1 includes an upper inner ring 111 and a lower inner ring 112, and they are connected to each other. The upper inner ring 111 and the lower inner ring 112 are fixedly connected by screws 14. The upper inner ring 111 and the lower inner ring 112 are each provided with an axial raceway 5, and the outer ring 2 is provided with two axial raceways 5 and one radial raceway 5.

[0024] Reference Figure 2 , Figure 3 and Figure 7 Furthermore, in order to facilitate the connection between the slewing bearing and the slewing platform of the crane, the inner ring 1 is connected to the slewing platform on the upper part of the crane by bolts passing through the mounting holes 18.

[0025] Reference Figure 2 and Figure 3, the outer ring 2 can have a gear 19 or not have a gear 19 ; the inner ring 1 can have a gear 19 or not have a gear 19 .

[0026] The implementation principle of Example 1 is: The mounting hole 18 of the outer ring 2 in the existing three-row roller slewing bearing is adjusted to a pin hole 10, and the outer ring 2 is connected to the base using a pin shaft 11; a row of radial rollers 4 between the inner ring 1 and the outer ring 2 is specifically used to bear radial force, and the remaining two rows of axial rollers 3 bear axial force and tipping moment. Compared with the existing three-row roller slewing bearing, frequent assembly and disassembly between the outer ring 2 and the base can be achieved, and the radial raceway 5 is an embedded raceway 5, which has a compact structure and can further improve the bearing capacity of the slewing bearing under the same maximum outer diameter.

[0027] Example 2 Reference Figure 6 The difference between Example 2 and Example 1 is that an upper ring groove is formed on the inner ring surface of the outer ring 2 which is higher than the upper plane of the inner ring 1 and a fourth sealing strip 15 is provided, a lower ring groove is formed on the outer ring surface of the inner ring 1 which is lower than the lower plane of the outer ring 2 and a fifth sealing strip 16 is provided, the lower side of the fourth sealing strip 15 abuts against the upper side of the fifth sealing strip 16, and the sealing between the inner ring 1 and the outer ring 2 is improved, thereby reducing the possibility of impurities and the like entering the interior of the slewing bearing through the above-mentioned gap, the fourth sealing strip 15 and the fifth sealing strip 16 abut against each other, and a lower ring groove is formed on the inner ring surface of the outer ring 2 which is lower than the lower plane of the inner ring 1 and a sixth sealing strip 17 is provided.

[0028] Reference Figure 6 Furthermore, a pin hole 10 is provided on the side wall of the inner ring 1 which is lower than the lower plane of the outer ring 2. The pin hole 10 is axially opened, and the inner ring 1 is connected to the base connecting seat 12 at the bottom of the crane by using a pin shaft 11 through the pin hole 10; the slewing bearing is hoisted onto the crane and dropped onto the base connecting seat 12 of the crane, and then the pin shaft 11 passes through the base connecting seat 12 and the inner ring 1 to connect the slewing bearing and the crane, which is simple and convenient to operate; compared with the existing three-row roller slewing bearing, frequent assembly and disassembly between the inner ring 1 and the base can be realized, which is convenient for disassembly and transfer of the crane.

[0029] Reference Figure 6 In the embodiment of the present application, the outer ring 2 includes an upper outer ring 211 and a lower outer ring 212 , which are connected to each other, and the upper outer ring 211 and the lower outer ring 212 are fixedly connected by screws 14 .

[0030] Reference Figure 6 and Figure 7 In order to facilitate the connection between the slewing bearing and the slewing platform of the crane, the outer ring 2 is connected to the slewing platform on the upper part of the crane by bolts through the mounting holes 18.

[0031] Reference Figure 6, the outer ring 2 can have a gear 19 or not have a gear 19 ; the inner ring 1 can have a gear 19 or not have a gear 19 .

[0032] The implementation principle of Example 2 is: The mounting hole 18 of the inner ring 1 in the existing three-row roller slewing bearing is adjusted to a pin hole 10, and the inner ring 1 is connected to the base using a pin shaft 11; a row of radial rollers 4 between the inner ring 1 and the outer ring 2 is specifically used to bear radial force, and the remaining two rows of axial rollers 3 bear axial force and tipping moment. Compared with the existing three-row roller slewing bearing, frequent assembly and disassembly between the inner ring 1 and the base can be achieved, and at the same time, the radial raceway 5 is an embedded raceway 5, which has a compact structure and can further improve the bearing capacity of the slewing bearing under the same maximum outer diameter.

[0033] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A new type of three-row roller slewing bearing for large tonnage cranes, characterized by: The invention comprises an inner ring (1), an outer ring (2) and rollers, wherein the rollers are arranged in three rows, the rollers are two rows of axial rollers (3) and one row of radial rollers (4), the radial rollers (4) are located between the two rows of axial rollers (3), the inner ring surface of the outer ring (2) is provided with three raceways (5) at intervals, the outer ring surface of the inner ring (1) is provided with three raceways (5) and they correspond to the raceways (5) of the outer ring (2) to form a complete raceway (5), the axial rollers (3) are located in the complete raceway (5), the radial rollers (4) are located in the middle raceway (5) of the outer ring (2) and the peripheral wall thereof abuts against the inner ring (1).

2. The new three-row roller slewing bearing for large-tonnage crane according to claim 1 is characterized in that: It also comprises a segmented cage (6), wherein the rollers are located in the segmented cage (6) for isolation.

3. The novel three-row roller slewing bearing for large-tonnage crane according to claim 1 is characterized in that: An upper ring groove is formed on the outer ring surface of the inner ring (1) which is higher than the upper plane of the outer ring (2) and a first sealing strip (7) is provided. A lower ring groove is formed on the inner ring surface of the outer ring (2) which is lower than the lower plane of the inner ring (1) and a second sealing strip (8) is provided. The first sealing strip (7) and the second sealing strip (8) abut against each other. A lower ring groove is formed on the inner ring surface of the outer ring (2) which is lower than the lower plane of the inner ring (1) and a third sealing strip (9) is provided.

4. The novel three-row roller slewing bearing for large-tonnage crane according to claim 1 is characterized in that: An upper ring groove is formed on the inner ring surface of the outer ring (2) which is higher than the upper plane of the inner ring (1) and a fourth sealing strip (15) is provided. A lower ring groove is formed on the outer ring surface of the inner ring (1) which is lower than the lower plane of the outer ring (2) and a fifth sealing strip (16) is provided. The fourth sealing strip (15) and the fifth sealing strip (16) abut against each other. A lower ring groove is formed on the inner ring surface of the outer ring (2) which is lower than the lower plane of the inner ring (1) and a sixth sealing strip (17) is provided.

5. The novel three-row roller slewing bearing for large-tonnage crane according to claim 3 is characterized in that: A pin hole (10) is provided on a side wall of the outer ring (2) that is lower than the lower plane of the inner ring (1), and the pin hole (10) is opened axially.

6. The novel three-row roller slewing bearing for large-tonnage crane according to claim 4 is characterized in that: A pin hole (10) is provided on a side wall of the inner ring (1) that is lower than the lower plane of the outer ring (2), and the pin hole (10) is opened axially.

7. The novel three-row roller slewing bearing for large-tonnage crane according to claim 3 is characterized in that: The inner ring (1) comprises an upper inner ring (111) and a lower inner ring (112), which are connected to each other. The upper inner ring (111) and the lower inner ring (112) are fixedly connected by screws (14).

8. The novel three-row roller slewing bearing for large-tonnage crane according to claim 4 is characterized in that: The outer ring (2) comprises an upper outer ring (211) and a lower outer ring (212), which are connected to each other, and the upper outer ring (211) and the lower outer ring (212) are fixedly connected by screws (14).

9. The novel three-row roller slewing bearing for large-tonnage crane according to claim 3 is characterized in that: The outer ring (2) is connected to a base connection seat (12) at the bottom of the crane by means of a pin hole (10) and a pin shaft (11), and the inner ring (1) is connected to a slewing platform at the top of the crane by means of bolts passing through a mounting hole (18).

10. The novel three-row roller slewing bearing for large-tonnage crane according to claim 4 is characterized in that: The inner ring (1) is connected to a base connection seat (12) at the bottom of the crane by means of a pin hole (10) and a pin shaft (11), and the outer ring (2) is connected to a slewing platform at the top of the crane by means of bolts through a mounting hole (18).

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