CN107269683B

CN107269683B - Wear-resistant turntable bearing

Info

Publication number: CN107269683B
Application number: CN201710450136.6A
Authority: CN
Inventors: 孙志华; 马赞兵
Original assignee: Zhejiang Changsheng Plastic Bearing Technology Co ltd
Current assignee: Zhejiang Changsheng Plastic Bearing Technology Co ltd
Priority date: 2017-06-15
Filing date: 2017-06-15
Publication date: 2022-12-02
Anticipated expiration: 2037-06-15
Also published as: CN107269683A

Abstract

The invention provides a wear-resistant turntable bearing, and belongs to the technical field of bearings. It has solved the current problem that the installation of carousel bearing is not simple and easy, the noise is big. The wear-resistant turntable bearing comprises an outer ring and an inner ring arranged in the outer ring, wherein the inner ring and the outer ring are coaxially and centrally arranged, a wear-resistant ring is arranged between the outer ring and the inner ring, the wear-resistant ring and the outer ring are coaxially and centrally arranged, the outer annular surface of the wear-resistant ring and the inner annular surface of the outer ring are in circumferential sliding contact, the inner annular surface of the wear-resistant ring and the outer annular surface of the inner ring are in circumferential sliding contact, a first limit structure used for limiting the relative axial movement of the inner ring and the wear-resistant ring is arranged between the inner ring and the wear-resistant ring, and a second limit structure used for limiting the relative axial movement of the outer ring and the wear-resistant ring is arranged between the outer ring and the wear-resistant ring. The wear-resistant ring replaces a roller in a traditional bearing, so that the bearing is simple and easy to install and easy to manufacture, has lower noise during working and is more stable in operation.

Description

Wear-resistant turntable bearing

Technical Field

The invention belongs to the technical field of bearings, and relates to a wear-resistant turntable bearing.

Background

The bearing generally includes an inner ring, an outer ring, a plurality of rollers and a cage, wherein the plurality of rollers are respectively arranged in corresponding pockets on a cage base and then are arranged in a raceway formed by the inner ring and the outer ring, and a cage cover is fixed on the upper end surface of the cage base. The turntable bearing is a large or super-large bearing which can bear comprehensive load and has a special structure, and has the characteristics of compact structure, flexible rotation, convenience in installation and maintenance and the like. The slewing bearing for the blast furnace (with the application publication number of CN 103148096A) disclosed in the Chinese patent comprises a first inner ring, a second inner ring, an outer ring and a plurality of rollers, wherein two axial raceways and a radial raceway are formed among the first inner ring, the second inner ring and the outer ring, a plurality of main thrust rollers are arranged in the first axial raceway, a plurality of auxiliary thrust rollers are arranged in the second axial raceway, and the radial rollers are arranged in the radial raceway; the first inner ring and the second inner ring are fixedly connected through a plurality of groups of symmetrically distributed positioning pins, and the baffle is arranged between the first inner ring and the outer ring and welded through uniformly distributed spot welding; the ports of an oil way X, an oil way Y and an oil way Z are arranged on the upper end face of the first inner ring, the oil way X leads to the second axial roller path, the oil way Y leads to the radial roller path, and the oil way Z leads to the first axial roller path.

Although the turntable bearing achieves the purposes of compact structure, flexible rotation and convenient installation, the following problems still exist: 1. because the roller bearing is provided with the axial roller path and the radial roller path, and the rollers are arranged in the roller paths, the rollers need to be orderly arranged during installation, and the installation is not easy; 2. when the bearing rolls, rolling friction is generated between each roller and the adjacent roller, and the rolling friction between each roller and the inner ring and the outer ring can generate larger noise; 3. the oil way is zigzag arranged in the inner ring, so that the manufacturing difficulty is high, and the oil way Z also requires the alignment of the oil way in the first inner ring and the oil way in the second inner ring, so that the installation is difficult; 4. adopt lubricating oil to lubricate it, need regularly to add lubricating oil to the oil circuit in, some places are inconvenient or when not adding lubricating oil regularly to adding lubricating oil, and the life of dry friction will greatly reduced bearing.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a wear-resistant turntable bearing which is easy to install and low in noise during working.

The purpose of the invention can be realized by the following technical scheme:

the wear-resistant turntable bearing is characterized in that a wear-resistant ring is arranged between the outer ring and the inner ring, the wear-resistant ring and the outer ring are coaxially and centrally arranged, the outer ring surface of the wear-resistant ring is in circumferential sliding contact with the inner ring surface of the outer ring, the inner ring surface of the wear-resistant ring is in circumferential sliding contact with the outer ring surface of the inner ring, a first limiting structure for limiting the relative axial movement of the inner ring and the wear-resistant ring is arranged between the inner ring and the wear-resistant ring, and a second limiting structure for limiting the relative axial movement of the outer ring and the wear-resistant ring is arranged between the outer ring and the wear-resistant ring.

In the wear-resistant turntable bearing, the limiting structure comprises two limiting discs which are respectively arranged at the middle parts of the two ends of the inner ring and are provided with shaft holes, the shaft holes of the limiting discs and the shaft holes of the inner ring are coaxially arranged, the shaft hole aperture of each limiting disc is larger than or equal to that of the inner ring, the limiting discs are fixed on the inner ring through connecting bolts, one end of each wear-resistant ring is abutted against one limiting disc, and the other end of each wear-resistant ring is abutted against the other limiting disc. The axial length of inner circle equals the axial length of wear-resisting circle, and spacing dish is circular and sets up with the inner circle is coaxial, and the external diameter of spacing dish is less than the external diameter of outer lane.

In foretell wear-resisting turntable bearing, the shaft hole aperture of spacing dish equals the shaft hole aperture of inner circle, one of them spacing dish and inner circle integrated into one piece, be equipped with a plurality of evenly distributed connecting holes on another spacing dish, the inner circle on have a plurality of screw holes that set up with the connecting hole one-to-one, foretell connecting bolt pass behind the connecting hole with screw hole threaded connection. The connecting hole is arranged on the limiting disc, the threaded hole is arranged on the inner ring, the connecting hole is not the only arrangement mode, the connecting hole can be arranged on the inner ring, and the threaded hole is arranged on the limiting disc. In order to prevent the rod head of the connecting bolt from protruding out of the end face of the limiting disc, the connecting hole is set to be a counter bore, and the rod head of the connecting bolt is completely immersed into the connecting hole after the limiting disc and the inner ring are connected.

In the above wear-resistant turntable bearing, the axial length of the outer ring is equal to the axial length of the wear-resistant ring, the outer diameter of the limiting disc is larger than the outer diameter of the wear-resistant ring, the second limiting structure is two limiting discs, one end of the outer ring abuts against one limiting disc, and the other end of the outer ring abuts against the other limiting disc.

In the above wear-resistant turntable bearing, the axial length of the outer ring is less than that of the wear-resistant ring, the outer diameter of the limiting disc is greater than that of the wear-resistant ring, the limiting structure II comprises a first stopping disc and a second stopping disc, the first stopping disc is arranged on the outer ring surface of the wear-resistant ring, the second stopping disc is symmetrical to the first stopping disc, the first stopping disc is arranged between one limiting disc and the outer ring, the second stopping disc is arranged between the other limiting disc and the outer ring, and the outer diameter of the first stopping disc is less than that of the outer ring. The first stop disc and the second stop disc are symmetrically arranged, and the first stop disc and the second stop disc are identical in shape and size. During installation, the wear-resistant ring is sleeved on the inner ring and is abutted against one of the limiting discs, then the first stopping disc, the outer ring and the second stopping disc are sequentially sleeved on the wear-resistant ring, and finally the other limiting disc is fixed on the inner ring through the connecting bolt. After the wear-resistant ring is installed, two end faces of the first stop disc are attached to one limiting disc and the outer ring respectively, two ends of the second stop disc are attached to the other limiting disc and the outer ring respectively, and axial movement of the outer ring relative to the wear-resistant ring can be effectively limited.

In the above wear-resistant turntable bearing, the wear-resistant ring includes a first wear-resistant disc and a second wear-resistant disc symmetrically disposed with the first wear-resistant disc, the first stop disc and the first wear-resistant disc are integrally formed, and the second stop disc and the second wear-resistant disc are integrally formed. When the anti-abrasion disc mounting structure is mounted, the first abrasion-resistant disc is sleeved on the inner ring, the outer ring is sleeved on the first abrasion-resistant disc, then the second abrasion-resistant disc is sleeved on the inner ring and extends to the inner ring surface of the outer ring, and finally the other limiting disc is fixed on the inner ring through the connecting bolt. The first stopping disc and the first wear-resisting disc are integrally formed by adopting a wear-resisting material, and the second stopping disc and the second wear-resisting disc are integrally formed by adopting a wear-resisting material, so that the movable contact between the outer ring and the inner ring as well as between the outer ring and the limiting disc is effectively limited, and the service life is prolonged.

In order to ensure that the whole bearing has more integrity, the outer diameter of the first stop disc is equal to that of the limiting disc, and the outer diameter of the second stop disc is equal to that of the limiting disc.

In the wear-resistant turntable bearing, the outer side of the first stopping disc is provided with a first annular groove and a plurality of second radial grooves which are uniformly distributed and are coaxial with the first stopping disc, and the second grooves are communicated with the first grooves; and the outer side of the stopping disc II is provided with a third annular groove and a plurality of evenly distributed fourth radial grooves, wherein the third annular groove and the fourth radial grooves are coaxially arranged with the stopping disc II, and the fourth radial grooves are communicated with the third radial grooves. The first groove, the second groove, the third groove and the fourth groove are used for containing and storing lubricating grease, and when the bearing rotates at a high speed, the first stopping disc/the second stopping disc and the limiting disc can be lubricated, so that the service life is prolonged.

In the wear-resistant turntable bearing, an annular groove five and a plurality of uniformly distributed radial grooves six are formed in the inner side of the stop disc I and are coaxial with the stop disc I, and the grooves six are communicated with the groove five; the inner side of the stopping disc II is provided with an annular groove seventh and a plurality of radial grooves eight which are uniformly distributed and are coaxial with the stopping disc II, and the groove seventh is communicated with the grooves eight. Similarly, when the high-speed running is performed, lubricating grease in the groove five, the groove six, the groove seven and the groove eight is used for lubricating and exchanging the stop disc I/the stop disc II and the outer ring, so that the service life is prolonged.

In the wear-resistant turntable bearing, the annular groove five is arranged close to the wear-resistant disc I, the outer annular surface of the wear-resistant disc I is provided with a plurality of axial grooves nine which are uniformly distributed, and the grooves nine are communicated with the groove five; the annular groove seven is arranged close to the second wear-resistant disc, the outer annular surface of the second wear-resistant disc is provided with a plurality of axial grooves ten which are uniformly distributed, and the grooves ten are communicated with the groove seven. And the lubrication between the outer ring and the first wear-resisting disc/the second wear-resisting disc is increased when the groove nine and the groove are arranged.

In the wear-resistant turntable bearing, the first wear-resistant disc and the second wear-resistant disc form an annular intermediate groove, the ninth groove and the tenth groove are respectively communicated with the annular intermediate groove, the inner annular surface of the first wear-resistant disc is provided with a plurality of uniformly distributed axial grooves eleven, the eleven grooves are communicated with the annular intermediate groove, the inner annular surface of the second wear-resistant disc is provided with a plurality of uniformly distributed axial grooves twelve, and the twelve grooves are communicated with the annular intermediate groove.

In the wear-resistant turntable bearing, an annular groove thirteen is formed in the inner annular surface of the first wear-resistant disc, and the groove eleven is communicated with the groove thirteen; and a fourteen annular groove is formed in the inner annular surface of the second wear-resistant disc, and the twelve groove is communicated with the fourteen groove. The grooves are communicated with each other, so that lubricating grease can circulate in the grooves conveniently, rotating parts of the bearing can be lubricated well, and the service life of the bearing is prolonged.

The wear-resistant bearing can generate slight abrasion when working for a long time, and the grooves can be used for containing abrasion dust generated in abrasion. Moreover, when the bearing rotates at a high speed, a large amount of heat is generated, the wear-resistant ring expands when heated, and the arranged groove can effectively absorb the expansion generated by the wear-resistant ring.

Compared with the prior art, the wear-resistant turntable bearing has the following advantages:

because the bearing does not use the roller as a rotating part, the noise is low during working, the axial movement of the wear-resistant ring is limited by the limiting disc, the axial movement of the outer ring is limited by the stop disc I and the stop disc II, and the running is stable; overall structure is simple, mainly comprises five parts, and it is easy and with low costs to make, and the installation is simple and easy, through setting up a plurality of recesses, can realize permanent oil-free lubrication, has effectively improved its life.

Drawings

Fig. 1 is a schematic structural diagram of a preferred embodiment of the present invention.

Fig. 2 is a front view of a preferred embodiment of the present invention.

Fig. 3 is a cross-sectional view of a preferred embodiment of the present invention.

Fig. 4 is a schematic view of a first structure of the wear-resistant disc provided by the invention.

Fig. 5 is a schematic view of a second structure of the first wear-resistant disc provided by the invention.

Fig. 6 is a schematic view of a first structure of a wear-resistant disc ii provided by the present invention.

Fig. 7 is a second structural schematic diagram of the wear-resistant disc provided by the invention.

Fig. 8 is a front view of a wear-resistant disc i provided by the present invention.

Fig. 9 isbase:Sub>A cross-sectional viewbase:Sub>A-base:Sub>A of fig. 8 in accordance with the present invention.

In the figure, 1, outer ring; 2. an inner ring; 3. a limiting disc; 4. a connecting bolt; 5. connecting holes; 6. a threaded hole; 7. a first stop disc; 8. a second stop disc; 9. a first wear-resistant disc; 10. A second wear-resistant disc; 11. a first groove; 12. a second groove; 13. a third groove; 14. a fourth groove; 15. a fifth groove; 16. a sixth groove; 17. a seventh groove; 18. eighthly, forming a groove; 19. a ninth groove; 110. ten grooves; 20. an annular intermediate groove; 21. eleven grooves; 22. a twelfth groove; 23. thirteen grooves; 24. fourteen grooves.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

Example one

The wear-resistant turntable bearing shown in fig. 1, 2 and 3 comprises an outer ring 1 and an inner ring 2 arranged in the outer ring 1, wherein the inner ring 2 is coaxial and aligned with the outer ring 1, as shown in fig. 3, a wear-resistant ring is arranged between the outer ring 1 and the inner ring 2, the wear-resistant ring is coaxial and aligned with the outer ring 1, an outer annular surface of the wear-resistant ring is in circumferential sliding contact with an inner annular surface of the outer ring 1, an inner annular surface of the wear-resistant ring is in circumferential sliding contact with an outer annular surface of the inner ring 2, a first limiting structure for limiting relative axial movement of the inner ring 2 and the wear-resistant ring is arranged between the inner ring 2 and the wear-resistant ring, and a second limiting structure for limiting relative axial movement of the outer ring 1 and the wear-resistant ring is arranged between the outer ring 1 and the wear-resistant ring.

As shown in fig. 3, the first limiting structure includes two limiting discs 3 respectively disposed at two ends of the inner ring 2 and having a shaft hole in the middle thereof, the shaft hole of the limiting disc 3 and the shaft hole of the inner ring 2 are coaxially disposed, the limiting discs 3 are fixed on the inner ring 2 by connecting bolts 4, one end of the wear-resistant ring abuts against one of the limiting discs 3, and the other end thereof abuts against the other limiting disc 3. The axial length of the inner ring 2 is equal to that of the wear-resistant ring, the limiting disc 3 is circular and is arranged coaxially with the inner ring 2, and the outer diameter of the limiting disc 3 is smaller than that of the outer ring 1.

Specifically, as shown in fig. 3, the hole diameter of the shaft hole of the limiting disc 3 is equal to the hole diameter of the shaft hole of the inner ring 2, one of the limiting discs 3 and the inner ring 2 are integrally formed, a plurality of uniformly distributed connecting holes 5 are formed in the other limiting disc 3, a plurality of threaded holes 6 which are in one-to-one correspondence with the connecting holes 5 are formed in the inner ring 2, and the connecting bolts 4 are in threaded connection with the threaded holes 6 after penetrating through the connecting holes 5. The connection hole 5 is not arranged on the limiting disc 3, and the threaded hole 6 is arranged on the inner ring 2, so that the connection hole 5 can be arranged on the inner ring 2, and the threaded hole 6 is arranged on the limiting disc 3. In order to prevent the rod head of the connecting bolt 4 from protruding out of the end face of the limiting disc 3, the connecting hole 5 is set to be a counter bore, and the rod head of the connecting bolt 4 is completely immersed into the connecting hole 5 after the limiting disc 3 and the inner ring 2 are connected.

As shown in fig. 3, the axial length of the outer ring 1 is smaller than that of the wear-resistant ring, the outer diameter of the limiting disc 3 is larger than that of the wear-resistant ring, the limiting structure II comprises a first stopping disc 7 arranged on the outer ring surface of the wear-resistant ring and a second stopping disc 8 symmetrically arranged with the first stopping disc 7, the first stopping disc 7 is located between one limiting disc 3 and the outer ring 1, the second stopping disc 8 is located between the other limiting disc 3 and the outer ring 1, and the outer diameter of the first stopping disc 7 is smaller than that of the outer ring 1. The first stop disk 7 and the second stop disk 8 are symmetrically arranged, and the first stop disk 7 and the second stop disk 8 are identical in shape and size.

As shown in fig. 3, the wear-resistant ring includes a first wear-resistant disc 9 and a second wear-resistant disc 10 symmetrically disposed with respect to the first wear-resistant disc 9, a first stop disc 7 is integrally formed with the first wear-resistant disc 9, and a second stop disc 8 is integrally formed with the second wear-resistant disc 10. When the anti-abrasion disc I9 is sleeved on the inner ring 2, the outer ring 1 is sleeved on the anti-abrasion disc I9, then the anti-abrasion disc II 10 is sleeved on the inner ring 2 and extends to the inner ring surface of the outer ring 1, and finally the other limiting disc 3 is fixed on the inner ring 2 through the connecting bolt 4. The first stopping disc 7 and the first wear-resistant disc 9 are integrally formed by wear-resistant materials, the second stopping disc 8 and the second wear-resistant disc 10 are integrally formed by wear-resistant materials, the outer ring 1 is effectively limited to be movably contacted with the inner ring 2, and the outer ring 1 is effectively limited to be movably contacted with the limiting disc 3, so that the service life is prolonged. In order to ensure that the whole bearing has more integrity, the outer diameter of the stop disc I7 is equal to that of the limiting disc 3, and the outer diameter of the stop disc II 8 is equal to that of the limiting disc 3.

As shown in fig. 4, an annular groove i 11 and a plurality of uniformly distributed radial grooves i 12 are arranged on the outer side of the stop disc i 7 and are coaxial with the stop disc i 7, and the grooves i 12 are communicated with the groove i 11. As shown in fig. 6, an annular groove three 13 and a plurality of evenly distributed radial grooves four 14 are arranged on the outer side of the stop disc two 8 and are coaxial with the stop disc two 8, and the grooves four 14 are communicated with the groove three 13. The first groove 11, the second groove 12, the third groove 13 and the fourth groove 14 are used for containing and storing lubricating grease, and when the bearing rotates at a high speed, the first stop disc 7/the second stop disc 8 and the limiting disc 3 can be lubricated, so that the service life is prolonged.

As shown in fig. 5, an annular groove five 15 and a plurality of uniformly distributed radial grooves six 16 which are coaxial with the stop disc one 7 are arranged on the inner side of the stop disc one 7, and the grooves six 16 are communicated with the groove five 15; as shown in fig. 7, an annular groove seven 17 and a plurality of uniformly distributed radial grooves eight 18 are arranged on the inner side of the second stop disk 8 and are coaxial with the second stop disk 8, and the groove seven 17 is communicated with the grooves eight 18. Similarly, when the high-speed running is performed, the lubricating grease in the groove five 15, the groove six 16, the groove seven 17 and the groove eight 18 is used for lubricating and exchanging the stop disc I7/the stop disc II 8 and the outer ring 1, so that the service life is prolonged.

As shown in fig. 8, the annular groove five 15 is provided near the wear-resistant disc one 9, and as shown in fig. 9, the outer annular surface of the wear-resistant disc one 9 is provided with a plurality of axial grooves nine 19 which are uniformly distributed, and the grooves nine 19 are communicated with the groove five 15. Meanwhile, the annular groove seven 17 is arranged close to the second wear-resistant disc 10, the outer annular surface of the second wear-resistant disc 10 is provided with a plurality of axial grooves ten 110 which are uniformly distributed, and the grooves ten 110 are communicated with the groove seven 17. The nine 19 and two 10 grooves increase the lubrication between the outer ring 1 and the first 9/second 10 wear-resistant discs.

As shown in fig. 3, the first wear-resistant disk 9 and the second wear-resistant disk 10 form an annular intermediate groove 20, and the nine recesses 19 and the ten recesses 110 are respectively communicated with the annular intermediate groove 20, as shown in fig. 4, the inner annular surface of the first wear-resistant disk 9 is provided with a plurality of uniformly distributed axial recesses eleven 21, the eleven recesses 21 are communicated with the annular intermediate groove 20, as shown in fig. 6, the inner annular surface of the second wear-resistant disk 10 is provided with a plurality of uniformly distributed axial recesses twelve 22, and the twelve recesses twelve 22 are communicated with the annular intermediate groove 20.

As shown in fig. 9, an annular groove thirteen 23 is formed on the inner annular surface of the first wear-resistant disk 9, and a groove eleven 21 is communicated with the groove thirteen 23, as shown in fig. 6, an annular groove fourteen 24 is formed on the inner annular surface of the second wear-resistant disk 10, and a groove twelve 22 is communicated with the groove fourteen 24. The grooves are communicated with each other, so that lubricating grease can circulate in the grooves conveniently, rotating parts of the bearing can be lubricated well, and the service life of the bearing is prolonged.

Example two

The structural principle of this embodiment is the same as that of embodiment one, and the difference lies in, the axial length of outer lane 1 equals the axial length of wear-resisting circle, and the external diameter of spacing dish 3 is greater than the external diameter of wear-resisting circle, and the one end of outer lane 1 supports and leans on one of them spacing dish 3, and its other end supports and leans on another spacing dish 3. The outer ring 1 is limited by the two limiting discs 3, so that materials can be further saved, and the manufacturing cost is reduced.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. A wear-resistant turntable bearing comprises an outer ring (1) and an inner ring (2) arranged in the outer ring (1), wherein the inner ring (2) and the outer ring (1) are coaxially and centrally arranged, the wear-resistant turntable bearing is characterized in that a wear-resistant ring is arranged between the outer ring (1) and the inner ring (2), the wear-resistant ring and the outer ring (1) are coaxially and centrally arranged, an outer ring surface of the wear-resistant ring is in circumferential sliding contact with an inner ring surface of the outer ring (1), an inner ring surface of the wear-resistant ring is in circumferential sliding contact with an outer ring surface of the inner ring (2), a first limiting structure for limiting relative axial movement of the inner ring (2) and the wear-resistant ring is arranged between the inner ring (2) and the wear-resistant ring, a second limiting structure for limiting relative axial movement of the outer ring (1) and the wear-resistant ring is arranged between the outer ring (1) and the wear-resistant ring, the first limiting structure comprises two limiting discs (3) which are respectively arranged at two ends of the inner ring (2) and are provided with a middle shaft hole, the shaft hole of the first limiting disc (3) and the second limiting disc (7) which are arranged coaxially with the inner ring (2), the other limiting disc (3) and the other limiting disc (7) is connected with the first limiting disc (7) through a bolt, the stop disc I (7) is positioned between one limiting disc (3) and the outer ring (1), the stop disc II (8) is positioned between the other limiting disc (3) and the outer ring (1), and the outer diameter of the stop disc I (7) is smaller than that of the outer ring (1).

2. A wear-resistant slewing bearing according to claim 1, wherein the axial hole diameter of the limiting discs (3) is equal to the axial hole diameter of the inner ring (2), one of the limiting discs (3) is integrally formed with the inner ring (2), a plurality of evenly distributed connecting holes (5) are provided on the other limiting disc (3), the inner ring (2) is provided with a plurality of threaded holes (6) which are arranged in one-to-one correspondence with the connecting holes (5), and the connecting bolts (4) are in threaded connection with the threaded holes (6) after passing through the connecting holes (5).

3. A wear-resistant slewing bearing according to claim 1, wherein the axial length of the outer ring (1) is less than the axial length of the wear-resistant ring, and the outer diameter of the limiting disc (3) is greater than the outer diameter of the wear-resistant ring.

4. A wear-resistant slewing bearing according to claim 3, wherein said wear-resistant ring comprises a first wear-resistant disc (9) and a second wear-resistant disc (10) arranged symmetrically to said first wear-resistant disc (9), said first stop disc (7) is formed integrally with said first wear-resistant disc (9), and said second stop disc (8) is formed integrally with said second wear-resistant disc (10).

5. A wear-resistant slewing bearing according to claim 4, wherein the outer side of the first stop disc (7) is provided with a first annular groove (11) and a plurality of uniformly distributed second radial grooves (12) which are coaxial with the first stop disc (7), and the second grooves (12) are communicated with the first groove (11); and the outer side of the stop disc II (8) is provided with an annular groove III (13) which is coaxial with the stop disc II (8) and a plurality of radial grooves IV (14) which are uniformly distributed, and the grooves IV (14) are communicated with the groove III (13).

6. A wear-resistant slewing bearing according to claim 5, wherein the inner side of the first stop disc (7) is provided with a fifth annular groove (15) and a plurality of six uniformly distributed radial grooves (16), the fifth annular groove (15) and the sixth radial grooves (16) are coaxially arranged with the first stop disc (7), and the six grooves (16) are communicated with the fifth annular groove (15); the inner side of the second stopping disc (8) is provided with a seventh annular groove (17) and eight radial grooves (18) which are coaxially arranged with the second stopping disc (8) and are uniformly distributed, and the seventh annular groove (17) is communicated with the eight radial grooves (18).

7. A wear-resistant slewing bearing according to claim 6, wherein said annular groove (15) is located adjacent to said first wear-resistant disc (9), said first wear-resistant disc (9) having a plurality of axially-oriented grooves (19) uniformly distributed on its outer circumferential surface, said grooves (19) communicating with said groove (15); the annular groove seven (17) is arranged close to the second wear-resisting disc (10), the outer annular surface of the second wear-resisting disc (10) is provided with a plurality of axial grooves ten (110) which are uniformly distributed, and the grooves ten (110) are communicated with the groove seven (17).

8. A wear-resistant slewing bearing according to claim 7, wherein said first (9) and second (10) wear-resistant discs are formed with annular intermediate grooves (20), said nine (19) and ten (110) grooves are respectively connected to the annular intermediate grooves (20), said first (9) wear-resistant disc has a plurality of uniformly distributed axial grooves eleven (21) on its inner circumferential surface, said eleven (21) grooves are connected to the annular intermediate grooves (20), said second (10) wear-resistant disc has a plurality of uniformly distributed axial grooves twelve (22) on its inner circumferential surface, and said twelve (22) grooves are connected to the annular intermediate grooves (20).

9. A wear-resistant slewing bearing according to claim 8, wherein said first wear-resistant disc (9) has an annular recess thirteen (23) in its inner annular surface, said recess eleven (21) communicating with recess thirteen (23); and a fourteen (24) annular groove is formed in the inner annular surface of the second wear-resisting disc (10), and a twelve (22) groove is communicated with the fourteen (24) groove.