Sealing mechanism for slewing bearing, slewing bearing and its working method

Abstract

This invention belongs to the field of engineering component technology and is a sealing mechanism for a slewing bearing, a slewing bearing, and a working method thereof. It includes: at least one sealing strip and a connecting assembly; wherein the sealing mechanism, through the connecting assembly, connects the sealing strip end-to-end to form a gap that fits between the inner and outer rings of the slewing bearing; the connecting assembly includes: an outer sleeve and a pair of clamping members; the clamping members are adapted to the shape of the inner wall of the outer sleeve, and the outer wall of the clamping members contacts the inner wall of the outer sleeve; the end of the sealing strip passes through the clamping members and extends into the outer sleeve, at which point the clamping members clamp the sealing strip; the clamping members are connected by a shape memory metal, and the shape memory metal is connected to the inner bottom surface of the outer sleeve; when heated, the shape memory metal deforms and arches upwards to pull the two clamping members closer together and cause the outer sleeve to arch inwards, thereby achieving the end-to-end connection of the sealing strip to form a seal and avoiding a decrease in sealing performance due to temperature rise.

Description

Technical Field

[0001] This invention belongs to the field of engineering component technology, specifically relating to joints, and more particularly to a sealing mechanism for a slewing bearing, a slewing bearing, and a working method thereof. Background Technology

[0002] The inner and outer rings of a slewing bearing rotate relative to each other. Due to the large size of the slewing bearing and the need for sealing between the outer and inner rings, a suitable sealing ring cannot be found. Therefore, in related technologies, a sealing strip is used to seal between the outer and inner rings. The ends of the sealing strip are connected by glue or similar materials. However, friction is generated when the inner and outer rings rotate, which increases heat. The increased heat causes the glue connection performance at the ends of the sealing strip to decrease, resulting in a reduction in the sealing effect of the sealing strip.

[0003] Therefore, in related technologies, the ends of the sealing strip are connected by glue. However, the heat generated by the rotation between the inner and outer rings of the slewing bearing causes the glue's bonding performance to deteriorate, which in turn reduces the sealing effect of the sealing strip. Therefore, it is necessary to design a sealing mechanism for a slewing bearing, a slewing bearing, and a working method.

[0004] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Summary of the Invention

[0005] This disclosure provides at least one sealing mechanism for a slewing bearing, a slewing bearing, and a method for its operation.

[0006] In a first aspect, embodiments of this disclosure provide a sealing mechanism for a slewing bearing, comprising:

[0007] At least one sealing strip, and connecting components;

[0008] The sealing mechanism uses a connecting component to connect the sealing strip end to end to form a gap that fits between the inner and outer rings of the slewing bearing.

[0009] The connection assembly includes: an outer sleeve and a pair of clamping members;

[0010] The clamping member is slidably disposed within the outer sleeve, and the clamping member is disposed near the corresponding end of the outer sleeve;

[0011] The clamping member is adapted to the shape of the inner wall of the outer sleeve, the outer wall of the clamping member contacts the inner wall of the outer sleeve, and the end of the sealing strip passes through the clamping member and extends into the outer sleeve. At this time, the clamping member clamps the sealing strip.

[0012] The clamping members are connected by a shape memory metal, and the shape memory metal is connected to the inner bottom surface of the outer casing. When heated, the shape memory metal deforms and arches upward to pull the two clamping members closer together and cause the outer casing to arch inward.

[0013] In one alternative implementation, the outer sleeve includes a protrusion and a contact portion;

[0014] The protrusion is located at the bottom of the contact portion, and both the protrusion and the contact portion are hollow and connected to each other;

[0015] The shape memory metal is connected to the inner bottom surface of the protrusion;

[0016] The protrusion extends into the gap formed between the inner and outer rings of the slewing bearing, and the contact portion contacts the side wall of the inner ring and the end face of the outer ring to seal the gap.

[0017] Secondly, embodiments of this disclosure also provide a slewing bearing, comprising:

[0018] An inner ring and an outer ring fitted around the inner ring, wherein the inner ring and the outer ring are rotatably connected;

[0019] The inner wall of the outer ring is provided with a first annular groove along the circumference, and the outer wall of the inner ring is provided with a second annular groove along the circumference. The first annular groove and the second annular groove form a cavity.

[0020] There is a gap between the outer wall of the inner ring and the inner wall of the outer ring, and the gap is filled with the aforementioned sealing mechanism for the slewing bearing.

[0021] In one alternative implementation, the gap communicates with the chamber;

[0022] The thickness of the inner ring is greater than the thickness of the outer ring. The protrusion in the sealing mechanism extends into the gap, and the contact portion contacts the side wall of the inner ring and the end face of the outer ring to seal the gap.

[0023] In one alternative embodiment, the cavity is provided with a plurality of ball bearings and the cavity is filled with grease.

[0024] In one optional embodiment, a plurality of oil injection holes are provided on the inner wall of the inner ring, and the oil injection holes are connected to the cavity to inject grease into the cavity through the oil injection holes.

[0025] In one optional embodiment, a through hole is provided on the inner wall of the inner ring to allow the ball to be inserted into the cavity through the through hole;

[0026] A pin hole is provided on the end face of the inner ring, and the pin hole is connected to the through hole;

[0027] A stop block is provided in the through hole, and a pin is provided in the pin hole. The pin is inserted into the stop block to fix the stop block, thereby blocking the through hole.

[0028] In one alternative implementation, when the inner and outer rings rotate and rub against each other, generating heat that causes the shape memory metal in the sealing mechanism to arch due to heat, the shape memory metal causes the side of the protrusion that extends into the gap to deform toward the end face of the outer ring.

[0029] Thirdly, this disclosure also provides a method for operating the sealing mechanism for a slewing bearing described above, comprising:

[0030] When heated, the shape memory metal deforms and arches upwards, pulling the two clamping parts closer together and causing the outer sleeve to arch inwards.

[0031] In one alternative implementation, the end of the sealing strip is clamped by the clamp as it passes through the clamp.

[0032] The beneficial effects of this invention are as follows: the sealing mechanism for the slewing bearing includes at least one sealing strip and a connecting assembly; wherein, the sealing mechanism, through the connecting assembly, connects the sealing strip end to end to form a gap that fits between the inner and outer rings of the slewing bearing; the connecting assembly includes an outer sleeve and a pair of clamping members; the clamping members are slidably disposed within the outer sleeve, and the clamping members are disposed near the corresponding ends of the outer sleeve; the shape of the clamping members is adapted to the inner wall of the outer sleeve, the outer wall of the clamping members contacts the inner wall of the outer sleeve, and the end of the sealing strip extends into the outer sleeve through the clamping members, at which time the clamping members clamp the sealing strip; the clamping members are connected by a shape memory metal, and the shape memory metal is connected to the inner bottom surface of the outer sleeve, the shape memory metal deforms and arches upward when heated, so as to pull the two clamping members closer together and drive the outer sleeve to arch inward, thereby realizing the end connection of the sealing strip to form a seal and avoiding the decrease in sealing performance due to temperature rise.

[0033] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0034] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0035] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of a sealing mechanism provided in an embodiment of the present disclosure;

[0037] Figure 2 This is a schematic diagram of the structure of a connection component provided in an embodiment of the present disclosure;

[0038] Figure 3 This is a schematic diagram of the structure of a slewing bearing provided in an embodiment of the present disclosure;

[0039] Figure 4 A partial cross-sectional view of a slewing bearing provided in an embodiment of this disclosure;

[0040] Figure 5 This is a schematic diagram of the structure of an inner ring provided in an embodiment of the present disclosure;

[0041] Figure 6 This is a schematic diagram of the structure of an outer ring provided in an embodiment of this disclosure.

[0042] In the picture:

[0043] 1 Sealing mechanism, 11 Sealing strip, 12 Connecting assembly, 121 Outer sleeve, 122 Protrusion, 123 Contact part, 124 Clamping part, 125 Shape memory metal;

[0044] 2. Slewing bearing, 21. Inner ring, 211. Second annular groove, 22. Outer ring, 221. First annular groove, 23. Ball bearing, 24. Oil injection hole, 25. Through hole, 26. Pin hole, 27. Stop block, 28. Chamber, 29. Gap. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0047] The inner and outer rings of a slewing bearing rotate relative to each other. Due to the large size of the slewing bearing and the need for sealing between the outer and inner rings, a suitable sealing ring cannot be found. Therefore, in related technologies, a sealing strip is used to seal between the outer and inner rings. The ends of the sealing strip are connected by glue or similar materials. However, friction is generated when the inner and outer rings rotate, which increases heat. The increased heat causes the glue connection performance at the ends of the sealing strip to decrease, resulting in a reduction in the sealing effect of the sealing strip.

[0048] Furthermore, when the temperature rises due to friction between the inner and outer rings, the sealing strip will expand, causing the sealing strip to come into closer contact with the inner and outer rings, increasing the wear of the sealing strip. Additionally, the pressure inside the cavity expands due to heat, which can cause the sealing strip to be blown open, affecting the sealing performance.

[0049] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0050] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0051] like Figure 1 and Figure 2As shown, at least one disclosed embodiment provides a sealing mechanism for a slewing bearing, comprising: at least one sealing strip 11, and a connecting assembly 12; wherein, the sealing mechanism 1, through the connecting assembly 12, connects the sealing strip 11 end to end to form a gap 29 between the inner ring 21 and the outer ring 22 of the slewing bearing 2; the connecting assembly 12 includes: an outer sleeve 121 and a pair of clamping members 124; the clamping members 124 are slidably disposed within the outer sleeve 121, and the clamping members 124 are disposed near the corresponding ends of the outer sleeve 121; the clamping members 124 are adapted to the shape of the inner wall of the outer sleeve 121. The outer wall of the clamping member 124 contacts the inner wall of the outer sleeve 121, and the end of the sealing strip 11 extends into the outer sleeve 121 through the clamping member 124. At this time, the clamping member 124 clamps the sealing strip 11. The clamping members 124 are connected by a shape memory metal 125, and the shape memory metal 125 is connected to the inner bottom surface of the outer sleeve 121. When heated, the shape memory metal 125 deforms and arches upward to pull the two clamping members 124 closer together and drive the outer sleeve 121 to arch inward, thereby achieving the end connection of the sealing strip 11 to form a seal and avoiding the decrease in sealing performance due to temperature rise.

[0052] In this embodiment, the number of sealing strips 11 can be set according to the size of the slewing bearing 2. The larger the slewing bearing 2, the more sealing strips 11 can be used. The ends of adjacent sealing strips 11 are connected by connecting components 12 to ensure that the inner ring 21 and outer ring 22 of the slewing bearing 2 are sealed.

[0053] In this embodiment, the inner wall of the clamping member 124 is slightly smaller than the sealing strip 11, so that when the sealing strip 11 passes through the clamping member 124 and extends into the outer sleeve 121, the sealing strip 11 is clamped and tightened by the clamping member 124, so that when the shape memory metal 125 deforms, it can be clamped and the sealing strip 11 can be moved.

[0054] In this embodiment, when the shape memory metal 125 is heated and deformed, the clamping member 124 can pull the sealing strip 11 to make the sealing strip 11 elongated. At this time, when the sealing strip 11 expands due to heat, the elongated sealing strip 11 expands and contacts and squeezes less in the direction of the inner ring 21 and the outer ring 22 compared to the unstretched sealing strip 11. This results in a smaller increase in friction at the contact position between the sealing strip 11 and the inner ring 21, and at the contact position between the sealing strip 11 and the outer ring 22, thereby reducing the wear of the sealing strip 11.

[0055] In this embodiment, when the shape memory metal 125 deforms, the side of the protrusion 122 that extends into the gap 29 deforms, and the side of the protrusion 122 that extends into the gap 29 becomes concave, so that the space of the sealed gap 29 and the chamber 28 increases. The pressure that increases due to heat in the chamber 28 decreases due to the increase in space, thus preventing the excessive pressure from breaking the seal.

[0056] like Figure 2 As shown, in an optional embodiment, the outer sleeve 121 includes a protrusion 122 and a contact portion 123; the protrusion 122 is disposed at the bottom of the contact portion 123, both the protrusion 122 and the contact portion 123 are hollow and connected to each other; the shape memory metal 125 is connected to the inner bottom surface of the protrusion 122; the protrusion 122 extends into the gap 29 formed between the inner ring 21 and the outer ring 22 of the slewing bearing 2, and the contact portion 123 contacts the side wall of the inner ring 21 and the end face of the outer ring 22 to seal the gap 29.

[0057] In this embodiment, the protrusion 122 can extend into the gap 29 to fix the outer sleeve 121, and the contact portion 123 can better ensure the sealing effect at the outer sleeve 121 by contacting the end face of the outer ring 22 and the outer wall of the inner ring 21.

[0058] In this embodiment, both the outer sleeve 121 and the sealing strip 11 may be made of rubber or the like.

[0059] In this embodiment, the clamping member 124 can be slidably connected to the contact portion 123. For example, a groove is provided on the inner wall of the contact portion 123 away from the protrusion 122, and a slider adapted to the groove is provided on the outer wall of the clamping member 124. The slider is located in the groove so that the movement of the clamping member 124 can be guided and limited by the cooperation between the groove and the slider after the shape memory metal 125 is deformed.

[0060] In this embodiment, when the temperature drops, the shape memory metal 125 recovers its deformation, causing the clamping member 124 to reset. After the clamping member 124 resets, it no longer stretches the sealing strip 11.

[0061] In this embodiment, the sealing strip 11 is embedded in the gap 29 to achieve a seal.

[0062] like Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, at least one other disclosed embodiment also provides a slewing bearing, including: an inner ring 21 and an outer ring 22 sleeved outside the inner ring 21, wherein the inner ring 21 and the outer ring 22 are rotatably connected; a first annular groove 221 is formed circumferentially on the inner wall of the outer ring 22, and a second annular groove 211 is formed circumferentially on the outer wall of the inner ring 21, wherein the first annular groove 221 and the second annular groove 211 form a cavity 28; a gap 29 exists between the outer wall of the inner ring 21 and the inner wall of the outer ring 22, and the gap 29 is filled with the sealing mechanism 1 of the slewing bearing 2 described above.

[0063] In this embodiment, a sealing mechanism 1 is provided on both the upper and lower end faces of the slewing bearing 2.

[0064] like Figure 4 As shown, in one optional embodiment, the slit 29 communicates with the chamber 28;

[0065] The thickness of the inner ring 21 is greater than the thickness of the outer ring 22. The protrusion 122 in the sealing mechanism 1 extends into the gap 29. The contact portion 123 contacts the side wall of the inner ring 21 and the end face of the outer ring 22 to seal the gap 29.

[0066] like Figure 4 As shown, in one optional embodiment, the chamber 28 is provided with a plurality of balls 23 and the chamber 28 is filled with grease.

[0067] In this embodiment, the inner ring 21 and the outer ring 22 can be rotated by the ball bearings 23 and the grease.

[0068] like Figure 4 As shown, in one optional embodiment, a plurality of oil injection holes 24 are provided on the inner wall of the inner ring 21. The oil injection holes 24 are connected to the chamber 28 so as to inject grease into the chamber 28 through the oil injection holes 24.

[0069] like Figure 4 As shown, in one optional embodiment, a through hole 25 is provided on the inner wall of the inner ring 21 to allow the ball bearing 23 to be placed into the chamber 28 through the through hole 25; a pin hole 26 is provided on the end face of the inner ring 21, and the pin hole 26 communicates with the through hole 25; a stop block 27 is provided in the through hole 25, and a pin is provided in the pin hole 26. The pin is inserted into the stop block 27 to fix the stop block 27, thereby blocking the through hole 25.

[0070] In this embodiment, after the ball 23 enters the chamber 28 through the through hole 25, the through hole 25 is blocked by the stop block 27. Then, the stop block 27 is fixed by passing a pin through the pin hole 26 to prevent the ball 23 from rolling out of the through hole 25.

[0071] In this embodiment, after the ball bearing 23 is installed, grease can be injected into the chamber 28 through the oil injection hole 24.

[0072] In one alternative embodiment, when the inner ring 21 and the outer ring 22 rotate and rub against each other, generating heat that causes the shape memory metal 125 in the sealing mechanism 1 to arch due to heat, the shape memory metal 125 causes the protrusion 122 to extend into the gap 29 and deform the end face of the outer ring 22 that is approaching it.

[0073] At least one other disclosed embodiment also provides a method of operation of the sealing mechanism 1 for the slewing bearing 2 described above, including: the shape memory metal 125 deforms and arches upward when heated, so as to pull the two clamping members 124 closer together and drive the outer sleeve 121 to arch inward.

[0074] In one alternative embodiment, the end of the sealing strip 11 is clamped by the clamping member 124 as it passes through the clamping member 124.

[0075] In summary, the sealing mechanism 1 for this slewing bearing 2 includes: at least one sealing strip 11, and a connecting assembly 12; wherein, the sealing mechanism 1, through the connecting assembly 12, connects the sealing strip 11 end to end to form a gap 29 between the inner ring 21 and the outer ring 22 of the slewing bearing 2; the connecting assembly 12 includes: an outer sleeve 121 and a pair of clamping members 124; the clamping members 124 are slidably disposed within the outer sleeve 121, and the clamping members 124 are disposed near the corresponding ends of the outer sleeve 121; the clamping members 124 are adapted to the shape of the inner wall of the outer sleeve 121, and the clamping members 124 are... The outer wall of the clamping member 124 contacts the inner wall of the outer sleeve 121, and the end of the sealing strip 11 extends into the outer sleeve 121 through the clamping member 124. At this time, the clamping member 124 clamps the sealing strip 11. The clamping members 124 are connected by a shape memory metal 125, and the shape memory metal 125 is connected to the inner bottom surface of the outer sleeve 121. When heated, the shape memory metal 125 deforms and arches upward to pull the two clamping members 124 closer together and drive the outer sleeve 121 to arch inward, thereby achieving the end connection of the sealing strip 11 to form a seal and avoiding the decrease in sealing performance due to temperature rise.

[0076] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0077] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as a second element, component, region, layer, or segment.

[0078] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0079] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.

[0080] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A sealing mechanism for a slewing bearing, characterized in that, include: At least one sealing strip (11), and a connecting component (12); The sealing mechanism (1) connects the sealing strip (11) end to end through the connecting component (12) to form a gap (29) between the inner ring (21) and the outer ring (22) of the slewing bearing (2); The connecting assembly (12) includes: an outer sleeve (121) and a pair of clamping members (124); The clamping member (124) is slidably disposed within the outer sleeve (121), and the clamping member (124) is disposed near the corresponding end of the outer sleeve (121); The clamping member (124) is adapted to the inner wall shape of the outer sleeve (121). The outer wall of the clamping member (124) contacts the inner wall of the outer sleeve (121). The end of the sealing strip (11) passes through the clamping member (124) and extends into the outer sleeve (121). At this time, the clamping member (124) clamps the sealing strip (11). The clamping members (124) are connected by a shape memory metal (125), and the shape memory metal (125) is connected to the inner bottom surface of the outer sleeve (121). When heated, the shape memory metal (125) deforms and arches upward to pull the two clamping members (124) closer together and drive the outer sleeve (121) to arch inward, thereby achieving the connection of the ends of the sealing strip (11) to form a seal. The outer casing (121) includes a protrusion (122) and a contact portion (123). The protrusion (122) is disposed at the bottom of the contact portion (123), and both the protrusion (122) and the contact portion (123) are hollow and connected to each other; The shape memory metal (125) is connected to the inner bottom surface of the protrusion (122); The protrusion (122) extends into the gap (29) formed between the inner ring (21) and the outer ring (22) of the slewing bearing (2), and the contact portion (123) contacts the side wall of the inner ring (21) and the end face of the outer ring (22) to seal the gap (29).

2. A slewing bearing, characterized in that, include: The inner ring (21) and the outer ring (22) sleeved on the outside of the inner ring (21) are rotatably connected to each other. The inner wall of the outer ring (22) is provided with a first annular groove (221) along the circumferential direction, and the outer wall of the inner ring (21) is provided with a second annular groove (211) along the circumferential direction. The first annular groove (221) and the second annular groove (211) form a chamber (28). There is a gap (29) between the outer wall of the inner ring (21) and the inner wall of the outer ring (22), and the gap (29) is filled with a sealing mechanism for a slewing bearing as described in claim 1.

3. The slewing bearing as described in claim 2, characterized in that, The gap (29) communicates with the chamber (28); The thickness of the inner ring (21) is greater than the thickness of the outer ring (22). The protrusion (122) in the sealing mechanism (1) extends into the gap (29). The contact part (123) contacts the side wall of the inner ring (21) and the end face of the outer ring (22) to seal the gap (29).

4. The slewing bearing as described in claim 2, characterized in that, The chamber (28) is provided with a plurality of ball bearings (23) and the chamber (28) is filled with grease.

5. The slewing bearing as described in claim 4, characterized in that, The inner wall of the inner ring (21) is provided with a plurality of oil injection holes (24), which are connected to the chamber (28) to inject grease into the chamber (28) through the oil injection holes (24).

6. The slewing bearing as described in claim 4, characterized in that, The inner wall of the inner ring (21) is provided with a through hole (25) so that the ball (23) can be placed into the chamber (28) through the through hole (25); A pin hole (26) is provided on the end face of the inner ring (21), and the pin hole (26) is connected to the through hole (25); A stop (27) is provided in the through hole (25), and a pin is provided in the pin hole (26). The pin is inserted into the stop (27) to fix the stop (27) so that the through hole (25) is blocked.

7. The slewing bearing as described in claim 4, characterized in that, When the inner ring (21) and the outer ring (22) rotate and rub against each other, the heat generated causes the shape memory metal (125) in the sealing mechanism (1) to be heated and arched. The shape memory metal (125) causes the protrusion (122) to extend into the gap (29) and deform the end face of the outer ring (22) that is close to it.

8. A method of operating a slewing bearing sealing mechanism as described in claim 1, characterized in that, include: When heated, the shape memory metal (125) deforms and arches upward to pull the two clamping pieces (124) closer together and cause the outer sleeve (121) to arch inward.

9. The working method as described in claim 8, characterized in that, The end of the sealing strip (11) is clamped by the clamp (124) when it passes through the clamp (124).

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