Slewing bearing and engineering machine

Abstract

The utility model discloses a slewing ring and engineering machinery, including slewing ring outer ring, slewing ring inner race and ball, the slewing ring inner race is installed in the inside of the slewing ring outer ring and coaxial setting, the axial direction of the slewing ring outer ring with the slewing ring inner race is along vertical extension, the outer circumferential surface of the slewing ring inner race with the inner circumferential surface of the slewing ring outer ring is connected together through a plurality of ball rolling, the inner circumferential surface of the slewing ring outer ring is equipped with the rubber strip groove of bottom end edge, the rubber strip groove is along the circumferential direction extension distribution of the slewing ring outer ring, the inside installation of the rubber strip groove has the first sealing rubber strip, the first sealing rubber strip, arc pressing plate, bolt and the slewing ring outer ring form a stable whole and can synchronous rotation to the basis of sealing performance promotion doubling, more can prevent the first sealing rubber strip from falling off.

Description

Technical Field

[0001] This utility model relates to the field of engineering machinery technology, and in particular to a slewing bearing and engineering machinery. Background Technology

[0002] See Figure 3 , Figure 4 The existing excavator slewing bearing consists of the existing slewing bearing outer ring (8), the existing slewing bearing inner ring (9), the existing ball bearing (10), and the existing sealing strip (11).

[0003] The shortcomings of the existing technology are: the chassis of the African gold mining machine is often immersed in mud, the sealing strip of the slewing bearing is not sealing well enough, and mud and sand can easily enter the slewing bearing raceway, causing raceway wear and reducing the service life of the slewing bearing; the chassis of the African gold mining machine is often immersed in mud, and the sealing strip of the slewing bearing is easy to fall off during rotation, mud and sand can enter the slewing bearing, causing raceway wear and reducing the service life of the slewing bearing. Utility Model Content

[0004] The purpose of this utility model is to provide a slewing bearing and engineering machinery to solve the technical problems in the prior art where the sealing strip of the slewing bearing is not sealing well enough, allowing mud and sand to easily enter the slewing bearing raceway, leading to raceway wear and reducing the service life of the slewing bearing; and the sealing strip of the slewing bearing is easy to fall off during rotation, allowing mud and sand to enter the slewing bearing, leading to raceway wear and reducing the service life of the slewing bearing.

[0005] To achieve the above objectives, the present invention provides a slewing bearing, comprising a slewing bearing outer ring, a slewing bearing inner ring, and ball bearings. The slewing bearing inner ring is installed inside the slewing bearing outer ring and is coaxially arranged. The axial direction of the slewing bearing outer ring and the slewing bearing inner ring extends vertically. The outer circumferential surface of the slewing bearing inner ring and the inner circumferential surface of the slewing bearing outer ring are connected by a plurality of ball bearings. A rubber strip groove is provided at the bottom edge of the inner circumferential surface of the slewing bearing outer ring. The rubber strip groove extends along the circumferential direction of the slewing bearing outer ring. A first sealing rubber strip is installed inside the rubber strip groove, and the first sealing rubber strip extends along the circumferential direction of the rubber strip groove. A V-shaped double-lip seal is provided on the side of the first sealing rubber strip facing the slewing bearing inner ring. The structure includes a V-shaped double-lip seal extending along the circumference of the first sealing strip. The upper and lower lips of the V-shaped double-lip seal are tightly fitted to the outer circumferential surface of the inner ring of the slewing bearing. The upper and lower lips of the V-shaped double-lip seal have a compression amount, so that the upper and lower lips of the V-shaped double-lip seal and the outer circumferential surface of the inner ring of the slewing bearing form two sealing lines. Several arc-shaped pressure plates are provided below the outer ring of the slewing bearing. The arc-shaped pressure plates are distributed sequentially along the circumferential direction of the outer ring of the slewing bearing. The side of the arc-shaped pressure plate away from the inner ring of the slewing bearing is fixed to the bottom surface of the outer ring of the slewing bearing by several bolts. The side of the arc-shaped pressure plate near the inner ring of the slewing bearing presses upward to fix the side of the first sealing strip away from the inner ring of the slewing bearing.

[0006] Furthermore, an L-shaped groove is provided on the side of the rubber strip groove away from the inner ring of the slewing bearing. The L-shaped groove extends along the circumferential direction of the rubber strip groove, and the L-shaped angle of the L-shaped groove faces the outer circumferential surface of the outer ring of the slewing bearing. An L-shaped structure is provided on the side of the first sealing rubber strip away from the inner ring of the slewing bearing. The L-shaped structure extends along the circumferential direction of the first sealing rubber strip, and the L-shaped angle of the L-shaped structure faces the outer circumferential surface of the outer ring of the slewing bearing. The L-shaped structure is tightly installed inside the L-shaped groove.

[0007] Furthermore, the V-shaped double-lip sealing structure and the L-shaped structure are integrally formed and connected with the first sealing strip, and the included angle between the upper and lower lips of the V-shaped double-lip sealing structure is an obtuse angle.

[0008] Furthermore, the lower half of the inner circumferential surface of the inner ring of the slewing bearing is provided with a recessed relief surface, and the upper and lower lips of the V-shaped double lip sealing structure extend to the outside of the rubber strip groove and fit tightly against the recessed relief surface, so that the upper and lower lips of the V-shaped double lip sealing structure and the recessed relief surface form two sealing lines.

[0009] Furthermore, the top surface of the recessed avoidance surface is an inclined surface, and the bottom of the recessed avoidance surface is downward through.

[0010] Furthermore, the arc-shaped pressure plate has a plurality of lugs on the side away from the inner ring of the slewing bearing. The plurality of lugs are distributed sequentially along the circumference of the arc-shaped pressure plate. The lugs are provided with mounting holes. The bottom surface of the outer ring of the slewing bearing has a plurality of threaded holes. The plurality of threaded holes are distributed sequentially along the circumference of the outer ring of the slewing bearing. The plurality of threaded holes are respectively fixed to the mounting holes on the plurality of lugs by bolts.

[0011] Furthermore, the arc-shaped pressure plate has an annular panel on the side near the inner ring of the slewing bearing. The annular panel extends along the circumference of the arc-shaped pressure plate and presses the first sealing strip upward to fix the side away from the inner ring of the slewing bearing. Several lugs, the annular panel, and the arc-shaped pressure plate are integrally formed and connected.

[0012] Furthermore, a plurality of the bolts are evenly distributed at intervals along the circumferential direction of the outer ring of the slewing bearing, the bolt shanks pass upward through the mounting holes and are installed in the threaded holes, and the bolt heads abut upward against the bottom surface of the lugs.

[0013] Furthermore, four arc-shaped pressure plates are provided below the outer ring of the slewing bearing. The four arc-shaped pressure plates are distributed sequentially along the circumferential direction of the outer ring of the slewing bearing, with the ends of two adjacent arc-shaped pressure plates close to each other, and the four arc-shaped pressure plates forming a circle. A second sealing strip is provided between the top edge of the outer circumferential surface of the inner ring of the slewing bearing and the top edge of the inner circumferential surface of the outer ring of the slewing bearing. One edge of the second sealing strip is fixed to the outer ring of the slewing bearing, and the other edge of the second sealing strip is tightly fitted to the inner ring of the slewing bearing.

[0014] This utility model also provides an engineering machinery, including an engineering machinery body and a slewing bearing as described in any of the above technical solutions, wherein the slewing bearing is mounted on the engineering machinery body.

[0015] In summary, the technical solution of this utility model has the following beneficial effects: The structure of this utility model is reasonable. (1) By setting an outer ring of the slewing bearing, an inner ring of the slewing bearing, and balls, the inner ring of the slewing bearing is installed inside the outer ring of the slewing bearing and is coaxially arranged. The axial direction of the outer ring of the slewing bearing and the inner ring of the slewing bearing extends vertically. The outer circumferential surface of the inner ring of the slewing bearing and the inner circumferential surface of the outer ring of the slewing bearing are connected together by several balls. The bottom edge of the inner circumferential surface of the outer ring of the slewing bearing is provided with a rubber strip groove. The rubber strip groove extends along the circumferential direction of the outer ring of the slewing bearing. The inside of the rubber strip groove is equipped with a first sealing rubber strip. The first sealing rubber strip extends along the circumferential direction of the rubber strip groove. The side of the first sealing rubber strip facing the inner ring of the slewing bearing is provided with a V-shaped double lip sealing structure. The V-shaped double lip sealing structure extends along the first ring of the slewing bearing. The sealing strip extends circumferentially, and the upper and lower lips of the V-shaped double-lip sealing structure are tightly fitted with the outer circumferential surface of the inner ring of the slewing bearing. The upper and lower lips of the V-shaped double-lip sealing structure have a compression amount, so that the upper and lower lips of the V-shaped double-lip sealing structure and the outer circumferential surface of the inner ring of the slewing bearing form two sealing defense lines. Therefore, when the slewing bearing of this utility model is applied to African gold panning machines (and of course, it can also be applied to other engineering machinery), even if the chassis of the African gold panning machine is often immersed in mud, the sealing performance is doubled because the upper and lower lips of the V-shaped double-lip sealing structure of the first sealing strip are tightly fitted with the outer circumferential surface of the inner ring of the slewing bearing and have a certain compression amount, forming two sealing defense lines. Therefore, it can prevent mud and sand from entering the slewing bearing raceway, reduce raceway wear, and improve the service life of the slewing bearing. (2) By setting several arc-shaped pressure plates below the outer ring of the slewing bearing, the arc-shaped pressure plates are distributed sequentially along the circumferential direction of the outer ring of the slewing bearing. The side of the arc-shaped pressure plate away from the inner ring of the slewing bearing is fixed to the bottom surface of the outer ring of the slewing bearing by several bolts. The side of the arc-shaped pressure plate close to the inner ring of the slewing bearing presses upward to fix the side of the first sealing strip away from the inner ring of the slewing bearing. Thus, when the slewing bearing of this utility model is applied to the African gold panning machine (of course, it can also be applied to other engineering machinery), even if the chassis of the African gold panning machine is often immersed in mud, the first sealing strip is installed inside the strip groove. The first sealing strip is pressed and fixed by the arc-shaped pressure plate. The arc-shaped pressure plate is fixed to the outer ring of the slewing bearing by bolts. The first sealing strip, the arc-shaped pressure plate, the bolts and the outer ring of the slewing bearing form a stable whole. Therefore, the first sealing strip of the slewing bearing can be prevented from falling off during rotation, thereby preventing mud and sand from entering the slewing bearing, reducing raceway wear and improving the service life of the slewing bearing. As can be seen from the above analysis, the first sealing strip, the arc-shaped pressure plate, the bolt, and the outer ring of the slewing bearing of this utility model form a stable whole and can rotate synchronously. Thus, while doubling the sealing performance, it can also prevent the first sealing strip from falling off. Therefore, this utility model effectively solves the problem of easy wear and easy strip detachment of the slewing bearing of the African gold mining machine, resulting in a short service life of the slewing bearing. Attached Figure Description

[0016] Figure 1 This is a partial cross-sectional structural diagram of the slewing bearing of this utility model; Figure 2 This is a bottom view schematic diagram of the slewing bearing of this utility model; Figure 3 This is a bottom view schematic diagram of the existing excavator slewing bearing structure; Figure 4 This is a partial cross-sectional structural diagram of the existing excavator slewing bearing; Explanation of reference numerals in the attached drawings: outer ring of slewing bearing (1), inner ring of slewing bearing (2), first sealing strip (3), bolt (4), arc-shaped pressure plate (5), ball bearing (6), second sealing strip (7); strip groove (101), L-shaped groove (102), threaded hole (103); recessed surface (201); V-shaped double lip seal structure (301), L-shaped structure (302); lug (501), mounting hole (502), annular panel (503). Existing slewing bearing outer ring (8), existing slewing bearing inner ring (9), existing ball bearing (10), existing sealing strip (11). Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model, but this does not constitute a limitation on the scope of protection of the present utility model.

[0018] In this utility model, for clearer description, the following explanation is provided: The observer faces the attached... Figure 1 When observing, the observer's left side is designated as left, the observer's right side as right, the area in front of the observer as front, the area behind the observer as back, the area above the observer as top, and the area below the observer as bottom. It should be noted that the terms "front end," "rear end," "left side," "right side," "middle," "above," and "below" used in this document indicate the orientation or positional relationship based on the accompanying drawings. These are merely for the purpose of clearly describing the present invention and do not indicate or imply that the structure or component referred to must have a specific orientation or be constructed in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," "third," and "fourth" are used only for the purpose of clarity or simplification of description and should not be construed as indicating or implying relative importance or quantity.

[0019] See Figures 1 to 2This embodiment provides a slewing bearing, including a slewing bearing outer ring 1, a slewing bearing inner ring 2, and balls 6. The slewing bearing inner ring 2 is installed inside the slewing bearing outer ring 1 and is coaxially arranged. The axial direction of the slewing bearing outer ring 1 and the slewing bearing inner ring 2 extends vertically. The outer circumferential surface of the slewing bearing inner ring 2 and the inner circumferential surface of the slewing bearing outer ring 1 are connected by a plurality of balls 6. A rubber strip groove 101 is provided at the bottom edge of the inner circumferential surface of the slewing bearing outer ring 1. The rubber strip groove 101 extends and is distributed along the circumferential direction of the slewing bearing outer ring 1. A first sealing rubber strip 3 is installed inside the rubber strip groove 101. The first sealing rubber strip 3 extends and is distributed along the circumferential direction of the rubber strip groove 101. A V-shaped double-lip sealing structure 301 is provided on the side of the first sealing rubber strip 3 facing the slewing bearing inner ring 2. The V-shaped double-lip sealing structure 301 extends along the circumferential direction of the first sealing strip 3. The upper and lower lips of the V-shaped double-lip sealing structure 301 are tightly fitted with the outer circumferential surface of the inner ring 2 of the slewing bearing. The upper and lower lips of the V-shaped double-lip sealing structure 301 have a compression amount, so that the upper and lower lips of the V-shaped double-lip sealing structure 301 and the outer circumferential surface of the inner ring 2 of the slewing bearing form two sealing defense lines. Several arc-shaped pressure plates 5 are provided below the outer ring 1 of the slewing bearing. The arc-shaped pressure plates 5 are distributed sequentially along the circumferential direction of the outer ring 1 of the slewing bearing. The side of the arc-shaped pressure plate 5 away from the inner ring 2 of the slewing bearing is fixed to the bottom surface of the outer ring 1 of the slewing bearing by several bolts 4. The side of the arc-shaped pressure plate 5 close to the inner ring 2 of the slewing bearing presses upward to fix the side of the first sealing strip 3 away from the inner ring 2 of the slewing bearing.Function: (1) By setting an outer ring, an inner ring, and balls, the inner ring of the slewing bearing is installed inside the outer ring of the slewing bearing and is coaxially arranged. The axial direction of the outer ring and the inner ring of the slewing bearing extends vertically. The outer circumferential surface of the inner ring of the slewing bearing and the inner circumferential surface of the outer ring of the slewing bearing are connected together by several balls. The bottom edge of the inner circumferential surface of the outer ring of the slewing bearing is provided with a rubber strip groove. The rubber strip groove extends along the circumferential direction of the outer ring of the slewing bearing. The first sealing rubber strip is installed inside the rubber strip groove. The first sealing rubber strip extends along the circumferential direction of the rubber strip groove. A V-shaped double lip sealing structure is provided on the side of the first sealing rubber strip facing the inner ring of the slewing bearing. The V-shaped double lip sealing structure extends along the circumferential direction of the first sealing rubber strip. The upper and lower lips of the sealing structure are tightly fitted to the outer circumferential surface of the inner ring of the slewing bearing. The upper and lower lips of the V-shaped double-lip sealing structure have a compression amount, so that the upper and lower lips of the V-shaped double-lip sealing structure and the outer circumferential surface of the inner ring of the slewing bearing form two sealing defense lines. Therefore, when the slewing bearing of this utility model is applied to African gold panning machines (of course, it can also be applied to other engineering machinery), even if the chassis of the African gold panning machine is often immersed in mud, the upper and lower lips of the V-shaped double-lip sealing structure of the first sealing strip are tightly fitted to the outer circumferential surface of the inner ring of the slewing bearing, and have a certain compression amount, forming two sealing defense lines, thus doubling the sealing performance. Therefore, it can prevent mud and sand from entering the slewing bearing raceway, reduce raceway wear, and improve the service life of the slewing bearing. (2) By setting several arc-shaped pressure plates below the outer ring of the slewing bearing, the arc-shaped pressure plates are distributed sequentially along the circumferential direction of the outer ring of the slewing bearing. The side of the arc-shaped pressure plate away from the inner ring of the slewing bearing is fixed to the bottom surface of the outer ring of the slewing bearing by several bolts. The side of the arc-shaped pressure plate close to the inner ring of the slewing bearing presses upward to fix the side of the first sealing strip away from the inner ring of the slewing bearing. Thus, when the slewing bearing of this utility model is applied to the African gold panning machine (of course, it can also be applied to other engineering machinery), even if the chassis of the African gold panning machine is often immersed in mud, the first sealing strip is installed inside the strip groove. The first sealing strip is pressed and fixed by the arc-shaped pressure plate. The arc-shaped pressure plate is fixed to the outer ring of the slewing bearing by bolts. The first sealing strip, the arc-shaped pressure plate, the bolts and the outer ring of the slewing bearing form a stable whole. Therefore, the first sealing strip of the slewing bearing can be prevented from falling off during rotation, thereby preventing mud and sand from entering the slewing bearing, reducing raceway wear and improving the service life of the slewing bearing. As can be seen from the above analysis, the first sealing strip, the arc-shaped pressure plate, the bolt, and the outer ring of the slewing bearing of this utility model form a stable whole and can rotate synchronously. Thus, while doubling the sealing performance, it can also prevent the first sealing strip from falling off. Therefore, this utility model effectively solves the problem of easy wear and easy strip detachment of the slewing bearing of the African gold mining machine, resulting in a short service life of the slewing bearing.

[0020] Specifically, an L-shaped groove 102 is provided on the side of the rubber strip groove 101 away from the inner ring 2 of the slewing bearing. The L-shaped groove 102 extends along the circumferential direction of the rubber strip groove 101, and the L-shaped angle of the L-shaped groove 102 faces the outer circumferential surface of the outer ring 1 of the slewing bearing. An L-shaped structure 302 is provided on the side of the first sealing rubber strip 3 away from the inner ring 2 of the slewing bearing. The L-shaped structure 302 extends along the circumferential direction of the first sealing rubber strip 3, and the L-shaped angle of the L-shaped structure 302 faces the outer circumferential surface of the outer ring 1 of the slewing bearing. The L-shaped structure 302 is tightly installed inside the L-shaped groove 102. Function: The cooperation between the L-shaped structure 302 and the L-shaped groove 102 effectively prevents the first sealing rubber strip from falling off when the L-shaped structure 302 is pressed and fixed upward by the arc-shaped pressure plate 5.

[0021] Specifically, the V-shaped double-lip sealing structure 301 and the L-shaped structure 302 are integrally formed and connected with the first sealing strip 3, and the included angle between the upper and lower lips of the V-shaped double-lip sealing structure 301 is an obtuse angle. Function: The integral forming connection provides better overall connection strength and ease of manufacturing for the V-shaped double-lip sealing structure 301, the L-shaped structure 302, and the first sealing strip 3, while the obtuse angle ensures sufficient isolation space between the upper and lower lips of the V-shaped double-lip sealing structure 301.

[0022] Specifically, the lower half of the inner circumferential surface of the inner ring 2 of the slewing bearing is provided with a recessed surface 201. The upper and lower lips of the V-shaped double-lip sealing structure 301 extend outside the rubber strip groove 101 and fit tightly against the recessed surface 201, so that the upper and lower lips of the V-shaped double-lip sealing structure 301 and the recessed surface 201 form two sealing lines. Function: The recessed surface 201 allows the upper and lower lips of the V-shaped double-lip sealing structure 301 to extend more beyond the rubber strip groove 101, thereby improving the sealing performance of the two sealing lines.

[0023] Specifically, the top surface of the recessed surface 201 is inclined, and the bottom of the recessed surface 201 is downward-through. Function: This design allows the upper and lower lips of the V-shaped double-lip sealing structure 301 to be better installed upwards within the recessed surface 201.

[0024] Specifically, the arc-shaped pressure plate 5 has several lugs 501 on the side away from the inner ring 2 of the slewing bearing. These lugs 501 are distributed sequentially along the circumference of the arc-shaped pressure plate 5. Each lug 501 has a mounting hole 502. The bottom surface of the outer ring 1 of the slewing bearing has several threaded holes 103, also distributed sequentially along the circumference of the outer ring 1. These threaded holes 103 are respectively fixed to the mounting holes 502 on the lugs 501 using bolts 4. Function: The lugs 501 and mounting holes 502 facilitate the fixing of the arc-shaped pressure plate 5 to the threaded holes 103 on the outer ring 1 of the slewing bearing using bolts 4, and also facilitate quick alignment of the installation position.

[0025] Specifically, an annular panel 503 is provided on the side of the arc-shaped pressure plate 5 near the inner ring 2 of the slewing bearing. The annular panel 503 extends along the circumference of the arc-shaped pressure plate 5 and presses upward to fix the first sealing strip 3 away from the inner ring 2 of the slewing bearing. Several lugs 501, the annular panel 503 and the arc-shaped pressure plate 5 are integrally formed and connected. Function: The annular panel 503 can continuously apply an upward pressing and fixing force to the first sealing strip 3, and the integral connection can improve the overall connection strength of the lugs 501, the annular panel 503 and the arc-shaped pressure plate 5.

[0026] Specifically, several bolts 4 are evenly distributed along the circumference of the outer ring 1 of the slewing bearing. The bolt shank of the bolt 4 passes upward through the mounting hole 502 and is installed in the threaded hole 103. The bolt head of the bolt 4 rests upward against the bottom surface of the lug 501. Function: The bolt head of the bolt 4 can apply an upward clamping force to the lug 501 for fixation.

[0027] Specifically, four arc-shaped pressure plates 5 are provided below the outer ring 1 of the slewing bearing. These four arc-shaped pressure plates 5 are distributed sequentially along the circumference of the outer ring 1, with the ends of adjacent arc-shaped pressure plates 5 close to each other, forming a circle. A second sealing strip 7 is provided between the top edge of the outer circumference of the inner ring 2 of the slewing bearing and the top edge of the inner circumference of the outer ring 1. One edge of the second sealing strip 7 is fixed to the outer ring 1, and the other edge is tightly fitted to the inner ring 2. Function: The four arc-shaped pressure plates 5, fixed with bolts, form a circle that continuously applies an upward pressing force to the entire annular first sealing strip 3, preventing it from falling off. Since the second sealing strip 7 is not on the side facing the harsh working direction, it can provide a simpler sealing effect.

[0028] This utility model also provides an engineering machinery, including the engineering machinery body and a slewing bearing according to any of the above-mentioned technical solutions, wherein the slewing bearing is mounted on the engineering machinery body. Application: The slewing bearing of this utility model is suitable for all gold mining machines and excavators requiring high-sealing slewing bearings.

[0029] In summary, the technical problems solved by this utility model are: optimizing the slewing bearing sealing structure, doubling the sealing performance of the slewing bearing, and increasing the service life of the slewing bearing; and optimizing the installation structure of the slewing bearing sealing strip to prevent the first sealing strip 3 from falling off, thereby increasing the service life of the slewing bearing.

[0030] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. A slewing bearing, comprising a slewing bearing outer ring (1), a slewing bearing inner ring (2), and balls (6), characterized in that: The inner ring (2) of the slewing bearing is installed inside the outer ring (1) of the slewing bearing and is coaxially arranged. The axial direction of the outer ring (1) of the slewing bearing and the inner ring (2) of the slewing bearing extends vertically. The outer circumferential surface of the inner ring (2) of the slewing bearing and the inner circumferential surface of the outer ring (1) of the slewing bearing are connected together by a plurality of balls (6). The bottom edge of the inner circumferential surface of the outer ring (1) of the slewing bearing is provided with a rubber strip groove (101). The rubber strip groove (101) extends along the circumferential direction of the outer ring (1) of the slewing bearing. A first sealing rubber strip (3) is installed inside the rubber strip groove (101). The first sealing rubber strip (3) extends along the circumferential direction of the rubber strip groove (101). The first sealing rubber strip (3) is provided with a V-shaped double lip sealing structure (301) on the side facing the inner ring (2) of the slewing bearing. The V-shaped double lip sealing structure (301) extends along the first sealing rubber strip groove (101). The rubber strip (3) extends in the circumferential direction. The upper and lower lips of the V-shaped double lip sealing structure (301) are tightly fitted with the outer circumferential surface of the inner ring (2) of the slewing bearing. The upper and lower lips of the V-shaped double lip sealing structure (301) have a compression amount so that the upper and lower lips of the V-shaped double lip sealing structure (301) and the outer circumferential surface of the inner ring (2) of the slewing bearing form two sealing lines. Several arc-shaped pressure plates (5) are provided below the outer ring (1) of the slewing bearing. Several arc-shaped pressure plates (5) are distributed in sequence along the circumferential direction of the outer ring (1) of the slewing bearing. The side of the arc-shaped pressure plate (5) away from the inner ring (2) of the slewing bearing is fixed to the bottom surface of the outer ring (1) of the slewing bearing by several bolts (4). The side of the arc-shaped pressure plate (5) close to the inner ring (2) of the slewing bearing presses upward to fix the side of the first sealing rubber strip (3) away from the inner ring (2) of the slewing bearing.

2. The slewing bearing according to claim 1, characterized in that: The rubber strip groove (101) is provided with an L-shaped groove (102) on the side away from the inner ring (2) of the slewing bearing. The L-shaped groove (102) extends along the circumferential direction of the rubber strip groove (101). The L-shaped angle of the L-shaped groove (102) faces the outer circumferential surface of the outer ring (1) of the slewing bearing. The first sealing strip (3) is provided with an L-shaped structure (302) on the side away from the inner ring (2) of the slewing bearing. The L-shaped structure (302) extends along the circumferential direction of the first sealing strip (3). The L-shaped angle of the L-shaped structure (302) faces the outer circumferential surface of the outer ring (1) of the slewing bearing. The L-shaped structure (302) is tightly installed inside the L-shaped groove (102).

3. A slewing bearing according to claim 2, characterized in that: The V-shaped double-lip sealing structure (301) and the L-shaped structure (302) are integrally formed and connected with the first sealing strip (3). The included angle between the upper and lower lips of the V-shaped double-lip sealing structure (301) is an obtuse angle.

4. A slewing bearing according to claim 1, characterized in that: The lower half of the inner circumferential surface of the inner ring (2) of the slewing bearing is provided with a recessed surface (201). The upper and lower lips of the V-shaped double lip sealing structure (301) extend to the outside of the rubber strip groove (101) and fit tightly with the recessed surface (201) so that the upper and lower lips of the V-shaped double lip sealing structure (301) and the recessed surface (201) form two sealing lines.

5. A slewing bearing according to claim 4, characterized in that: The top surface of the recessed surface (201) is an inclined surface, and the bottom of the recessed surface (201) is downward through.

6. A slewing bearing according to any one of claims 1 to 5, characterized in that: The arc-shaped pressure plate (5) has a plurality of lugs (501) on the side away from the inner ring (2) of the slewing bearing. The plurality of lugs (501) are distributed sequentially along the circumferential direction of the arc-shaped pressure plate (5). The lugs (501) are provided with mounting holes (502). The bottom surface of the outer ring (1) of the slewing bearing is provided with a plurality of threaded holes (103). The plurality of threaded holes (103) are distributed sequentially along the circumferential direction of the outer ring (1) of the slewing bearing. The plurality of threaded holes (103) are respectively fixed to the mounting holes (502) on the lugs (501) by the bolts (4).

7. A slewing bearing according to claim 6, characterized in that: The arc-shaped pressure plate (5) is provided with an annular panel (503) on the side near the inner ring (2) of the slewing bearing. The annular panel (503) extends along the circumference of the arc-shaped pressure plate (5). The annular panel (503) presses and fixes the first sealing strip (3) on the side away from the inner ring (2) of the slewing bearing. Several lugs (501), the annular panel (503) and the arc-shaped pressure plate (5) are integrally formed and connected.

8. A slewing bearing according to claim 6, characterized in that: Several bolts (4) are evenly distributed at intervals along the circumferential direction of the outer ring (1) of the slewing bearing. The bolts (4) pass upward through the mounting hole (502) and are installed in the threaded hole (103). The bolt heads (4) abut upward against the bottom surface of the lug (501).

9. A slewing bearing according to any one of claims 1 to 5, characterized in that: Four arc-shaped pressure plates (5) are provided below the outer ring (1) of the slewing bearing. The four arc-shaped pressure plates (5) are distributed sequentially along the circumferential direction of the outer ring (1) of the slewing bearing. The ends of two adjacent arc-shaped pressure plates (5) are close to each other, and the four arc-shaped pressure plates (5) form a circle. A second sealing strip (7) is provided between the top edge of the outer circumferential surface of the inner ring (2) of the slewing bearing and the top edge of the inner circumferential surface of the outer ring (1) of the slewing bearing. One side edge of the second sealing strip (7) is installed and fixed on the outer ring (1) of the slewing bearing, and the other side edge of the second sealing strip (7) is tightly fitted with the inner ring (2) of the slewing bearing.

10. An engineering machinery, comprising an engineering machinery body, characterized in that: It also includes the slewing bearing as described in any one of claims 1 to 9, the slewing bearing being mounted on the engineering machinery body.

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