Slewing bearing for tower crane

Abstract

The slewing bearing for the tower crane comprises an inner ring, an outer ring, balls, an upper sealing strip and a lower sealing strip, the outer ring is provided with a containing cavity, a first ring groove is formed in the side wall of the containing cavity, a second ring groove is formed in the outer side wall of the inner ring, the inner ring is arranged on the containing cavity, the first ring groove is opposite to the second ring groove, and the balls are arranged in the containing cavity. One end of the ball is embedded in the second ring groove, the other end of the ball is embedded in the first ring groove, a first oil hole is formed in the inner ring and communicated with the second ring groove, a second oil hole is formed in the outer ring and communicated with the first ring groove, a gap is formed between the outer side wall of the inner ring and the side wall of the containing cavity, and the gap is provided with an upper opening and a lower opening; one ends of the upper sealing strip and the lower sealing strip are connected with the inner ring, the other ends of the upper sealing strip and the lower sealing strip are connected with the outer ring, the upper sealing strip seals the upper opening of the gap, and the lower sealing strip seals the lower opening of the gap. According to the utility model, the condition that lubricating oil is only accumulated in the second ring groove or the first ring groove due to the fact that the lubricating oil is only input from a single side can be avoided.

Description

Technical Field

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

[0002] Tower cranes, also known as tower hoists, are mainly used for transporting materials in building construction. When transporting materials horizontally, tower cranes often need to rotate, and this rotation is inseparable from the use of slewing bearings.

[0003] Currently, for slewing bearings, on the one hand, lubricating oil is mostly pre-added. However, due to the high working intensity and large size of the slewing bearings used in tower cranes, the lubricating oil is consumed quickly. At the same time, the lubrication requirements are high. If the bearing cannot be lubricated in time during operation, it will greatly affect its operational reliability. On the other hand, after the lubricating oil is added, there is no relevant sealing structure on the slewing bearing, so the lubricating oil is prone to leakage, which further increases the probability of insufficient lubrication during the operation of the slewing bearing. Utility Model Content

[0004] The purpose of this utility model is to provide a slewing bearing for tower cranes that can solve one or more of the above-mentioned problems.

[0005] According to one aspect of this utility model, a slewing bearing for a tower crane is provided, comprising an inner ring, an outer ring, balls, an upper sealing strip, and a lower sealing strip.

[0006] The outer ring has a receiving cavity, and the side wall of the receiving cavity has a first annular groove. The outer side wall of the inner ring has a second annular groove. The inner ring is disposed on the receiving cavity. The first annular groove and the second annular groove are opposite to each other. One end of the ball is embedded in the second annular groove, and the other end is embedded in the first annular groove.

[0007] The inner ring is provided with a first oil hole, which communicates with a second annular groove; the outer ring is provided with a second oil hole, which communicates with the first annular groove.

[0008] A gap is formed between the outer wall of the inner ring and the side wall of the accommodating cavity. The gap has an upper opening and a lower opening. One end of the upper sealing strip and the lower sealing strip are connected to the inner ring, and the other end is connected to the outer ring. The upper sealing strip closes the upper opening of the gap, and the lower sealing strip closes the lower opening of the gap.

[0009] The beneficial effects of this invention are as follows: The first and second oil holes facilitate the input of lubricating oil into the second and first annular grooves when needed, preventing insufficient lubrication of the ball bearings during operation. Furthermore, the separate first and second oil holes prevent lubricating oil from accumulating solely in either the second or first annular groove due to unilateral input, ensuring sufficient lubrication for the ball bearings and further guaranteeing adequate lubrication. Additionally, the invention includes upper and lower sealing strips to effectively seal gaps and reduce the probability of lubricating oil leakage.

[0010] In some embodiments, the sidewall of the second annular groove is provided with a first groove, and the sidewall of the first annular groove is provided with a second groove, with the first and second grooves arranged opposite to each other. The first and second grooves can be used to accommodate lubricating oil to ensure that the balls have sufficient lubricating oil in the second and first annular grooves during operation.

[0011] In some embodiments, the inner ring has a central hole, one end of the first oil hole is connected to the first groove, and the other end of the first oil hole is located on the inner wall of the central hole. By placing one end of the first oil hole on the inner wall of the central hole, the central hole provides sufficient space for an external oil supply pipe, facilitating oil supply to the first oil hole.

[0012] In some embodiments, the present invention further includes a first oil nozzle, which is mounted on the inner wall of the central hole and communicates with the first oil hole. The first oil nozzle facilitates connection to an external oil supply pipeline.

[0013] In some embodiments, the second oil hole has a turning portion, one end of the second oil hole is connected to the second groove, and the other end of the second oil hole is located on the top of the outer ring. Positioning one end of the second oil hole at the top of the outer ring allows sufficient space for an external oil supply pipe to be installed to supply oil to the second oil hole.

[0014] In some embodiments, the present invention further includes a second oil nozzle, which is mounted on the top of the outer ring and communicates with a second oil hole. The second oil nozzle facilitates connection to an external oil supply pipeline.

[0015] In some embodiments, the outer ring has teeth on its outer side, and there are multiple teeth. The teeth can mesh with an external gear, so that an external power device can drive the gear to rotate, thereby causing the outer ring to rotate accordingly.

[0016] In some embodiments, the inner ring is provided with a first connecting hole, and there are multiple first connecting holes, which longitudinally penetrate the inner ring. The external structure can be connected to the inner ring by bolts through the first connecting holes, thereby enabling the external structure to be fixedly connected to the inner ring.

[0017] In some embodiments, the outer ring is provided with a second connecting hole, and there are multiple second connecting holes, which extend longitudinally through the outer ring. The external structure can be connected to the outer ring via bolts through the second connecting holes, thereby enabling the external structure to be fixedly connected to the outer ring. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a slewing bearing for a tower crane according to one embodiment of the present invention.

[0019] Figure 2 This is a cross-sectional view of a slewing bearing for a tower crane according to one embodiment of the present invention.

[0020] Figure 3 This is a top view of a slewing bearing for a tower crane, representing one embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the inner ring of a slewing bearing for a tower crane, according to one embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram of the outer ring of a slewing bearing for a tower crane, according to one embodiment of the present invention.

[0023] In the diagram: 1. Inner ring, 2. Outer ring, 3. Ball bearing, 4. Upper sealing strip, 5. Lower sealing strip, 6. First grease nipple, 7. Second grease nipple, 11. Second annular groove, 111. First groove, 12. First oil hole, 13. Center hole, 14. First connecting hole, 21. Receiving cavity, 211. First annular groove, 212. Second groove, 22. Second oil hole, 23. Second connecting hole, 24. Gear tooth, 10. Gap. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings.

[0025] refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The present invention relates to a slewing bearing for a tower crane, comprising an inner ring 1, an outer ring 2, ball bearings 3, an upper sealing strip 4, and a lower sealing strip 5.

[0026] The outer ring 2 has a accommodating cavity 21 at its center, and a first annular groove 211 is provided on the middle of the side wall of the accommodating cavity 21. The inner ring 1 has a second annular groove 11 on its outer side wall. Multiple balls 3 can be present, and adjacent balls 3 can be separated by spacers. The inner ring 1 is located on the accommodating cavity 21. The first annular groove 211 and the second annular groove 11 are aligned, with one end of each ball 3 correspondingly embedded in the second annular groove 11 and the other end embedded in the first annular groove 211. The balls 3 can roll along the first annular groove 211 and the second annular groove 11. Additionally, the outer ring 2 has multiple gear teeth 24 on its outer side.

[0027] The side wall of the second annular groove 11 is also provided with a first groove 111, that is, the first groove 111 is similar to the second annular groove 11 in that it is annular. The side wall of the first annular groove 211 is provided with a second groove 212, which is also annular. After the inner ring 1 is set on the receiving cavity 21 of the outer ring 2, the first groove 111 and the second groove 212 are arranged opposite to each other.

[0028] The inner ring 1 has a first oil hole 12 and a central hole 13 in its center. One end of the first oil hole 12 is connected to the first groove 111, and the other end of the first oil hole 12 is located on the inner wall of the central hole 13, so that the first oil hole 12 can be connected to the second annular groove 11 through the first groove 111. In order to improve the efficiency of lubricating oil supply, several first oil holes 12 can be provided as needed, which are distributed in the inner ring 1.

[0029] The slewing bearing of this tower crane may also include a first grease nipple 6, the number of which is equivalent to the number of first oil holes 12. The first grease nipple 6 can be installed on the inner wall of the center hole 13 by threaded connection, and the first grease nipple 6 is connected to the first oil hole 12.

[0030] The outer ring 2 is provided with a second oil hole 22. The second oil hole 22 has a turning part, and one end of the second oil hole 22 is connected to the second groove 212. The other end of the second oil hole 22 is located on the top of the outer ring 2, so that the second oil hole 22 can be connected to the first annular groove 211 through the second groove 212. In order to improve the lubricating oil supply efficiency, several second oil holes 22 can be provided as needed, which are distributed in the outer ring 2.

[0031] The slewing bearing of this tower crane may also include a second grease nipple 7, the number of which may be equivalent to the number of second oil holes 22. The second grease nipple 7 is installed on the top of the outer ring 2 by a threaded connection, and the second grease nipple 7 is connected to the second oil hole 22.

[0032] After the inner ring 1 is placed on the receiving cavity 21 of the outer ring 2, a gap 10 is formed between the outer side wall of the inner ring 1 and the side wall of the receiving cavity 21. The gap 10 has an upper opening and a lower opening.

[0033] Both the upper sealing strip 4 and the lower sealing strip 5 are connected to the inner ring 1 at one end and to the outer ring 2 at the other end. The upper sealing strip 4 can close the upper opening of the gap 10, and the lower sealing strip 5 can close the lower opening of the gap 10, thereby achieving the sealing of the gap 10.

[0034] In addition, the inner ring 1 is provided with a first connecting hole 14, and there can be multiple first connecting holes 14, all of which longitudinally penetrate the inner ring 1. The external structure can be connected to the inner ring 1 by bolts through the first connecting holes 14, thereby enabling the external structure to be fixedly connected to the inner ring 1.

[0035] The outer ring 2 is provided with a second connecting hole 23, and there can be multiple second connecting holes 23, all of which longitudinally penetrate the outer ring 2. The external structure can be connected to the outer ring 2 by bolts through the second connecting holes 23, thereby allowing the external structure to be fixedly connected to the outer ring 2.

[0036] This slewing bearing can be used on rotating components of tower cranes, such as the tower crane itself and its base. Preferably, the inner ring 1 can be fixedly mounted on the base of the tower crane with screws, while the tower crane itself, which needs to rotate, is fixedly connected to the outer ring 2 with screws. The power unit on the tower crane, such as a motor, can mesh with the gear teeth 24 on the outer ring 2 through gears, so that the power unit can drive the gear teeth 24 to rotate, thus allowing the outer ring 2 to rotate. The tower crane connected to the outer ring 2 can then rotate relative to the base.

[0037] When the outer ring 2 and the inner ring 1 rotate relative to each other, the ball bearing 3 can roll along the first annular groove 211 and the second annular groove 11. When the movement of the ball bearing 3 requires lubrication, an external lubricating oil supplier can deliver a certain amount of lubricating oil to the first oil hole 12 and the second oil hole 22 through the first oil nozzle 6 and the second oil nozzle 7 respectively, to lubricate the movement of the ball bearing 3. At the same time, due to the presence of the upper sealing strip 4 and the lower sealing strip 5, the gap 10 can be effectively sealed, effectively reducing the probability of lubricating oil leakage.

[0038] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A slewing bearing for a tower crane, characterized in that, Includes inner ring, outer ring, balls, upper sealing strip, and lower sealing strip. The outer ring has a receiving cavity, and the side wall of the receiving cavity has a first annular groove. The outer side wall of the inner ring has a second annular groove. The inner ring is disposed on the receiving cavity. The first annular groove and the second annular groove are opposite to each other. One end of the ball is embedded in the second annular groove, and the other end is embedded in the first annular groove. The inner ring is provided with a first oil hole, which communicates with a second annular groove; the outer ring is provided with a second oil hole, which communicates with the first annular groove. A gap is formed between the outer wall of the inner ring and the side wall of the accommodating cavity. The gap has an upper opening and a lower opening. One end of the upper sealing strip and the lower sealing strip are connected to the inner ring, and the other end is connected to the outer ring. The upper sealing strip closes the upper opening of the gap, and the lower sealing strip closes the lower opening of the gap.

2. A slewing bearing for a tower crane according to claim 1, characterized in that, The second annular groove has a first groove on its sidewall, and the first annular groove has a second groove on its sidewall, with the first groove and the second groove being arranged opposite to each other.

3. A slewing bearing for a tower crane according to claim 2, characterized in that, The inner ring is provided with a central hole, one end of the first oil hole is connected to the first groove, and the other end of the first oil hole is located on the inner wall of the central hole.

4. A slewing bearing for a tower crane according to claim 3, characterized in that, It includes a first oil nozzle, which is installed on the inner wall of the central hole and is connected to the first oil hole.

5. A slewing bearing for a tower crane according to claim 2, characterized in that, The second oil hole has a turning part, one end of the second oil hole is connected to the second groove, and the other end of the second oil hole is located on the top of the outer ring.

6. A slewing bearing for a tower crane according to claim 5, characterized in that, It includes a second grease nipple, which is mounted on the top of the outer ring and is connected to a second grease hole.

7. A slewing bearing for a tower crane according to claim 1, characterized in that, The outer ring has teeth on its outer side, and there are multiple teeth.

8. A slewing bearing for a tower crane according to claim 1, characterized in that, The inner ring is provided with a first connecting hole, and there are multiple first connecting holes, which longitudinally penetrate the inner ring.

9. A slewing bearing for a tower crane according to claim 1, characterized in that, The outer ring is provided with a second connecting hole, and there are multiple second connecting holes, which longitudinally penetrate the outer ring.

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