Waterproof slewing mechanism and offshore platform crane

Abstract

The utility model provides a waterproof slewing mechanism and an offshore platform crane. The waterproof slewing mechanism comprises a rotary speed reducer, a stand column upper connecting plate and a cantilever connecting plate. The cantilever connecting plate covers the rotary speed reducer, and a water separation groove is formed in the lower plane of the cantilever connecting plate and used for preventing eave water of the cantilever connecting plate from flowing into the rotary speed reducer; the rotary speed reducer comprises a shell, an inner ring and an outer ring, and a sealing ring is arranged between the shell and the inner ring, so that the rotary speed reducer forms a closed space; a water guide groove is formed in the rotary speed reducer and used for enabling accumulated water on the sealing ring to flow out smoothly; the stand column upper connecting plate bears the rotary speed reducer, a water flowing groove is formed in the upper plane of the stand column upper connecting plate, and condensate water generated due to the fact that a cavity is formed between the rotary speed reducer and the cantilever connecting plate is guided out. Aiming at the working state that the rotary speed reducer is inversely installed, the waterproof effect of the rotary speed reducer of the offshore crane is improved. The waterproof slewing mechanism is suitable for use.

Description

Technical Field

[0001] The utility model relates to a slewing support device in the field of offshore platform cranes, in particular to a waterproof slewing mechanism and an offshore platform crane. Background Art

[0002] Small cranes are small in size and easy to operate. They are widely used on offshore platforms and various types of ships. They are often used to transfer goods and personnel between ships and docks, ships and platforms. The cantilever of this type of crane is installed on a slewing support device, and the operator operates the driving handwheel to rotate the boom. Due to the need for offshore wind protection and the influence of the ship's shaking, offshore cranes usually require operators to have a fixed position, and the driving handwheel does not rotate with the cantilever, so the installation method of the rotary reducer is an inverted installation with the inner ring facing down and the outer ring facing up. Inverted installation will cause the waterproof structure to lose its original working state, and water will enter the slewing support device, resulting in poor lubrication, rust and corrosion. In severe cases, the slewing reducer will be damaged and will not rotate at all.

[0003] The existing rotary reducer of the offshore crane usually adopts a single sealing ring or a customized double sealing ring for waterproof sealing. The single sealing ring or the customized double sealing ring is aimed at the situation when the rotary reducer is in the upright state. For the rotary reducer installed inverted, the sealing position does not match the installation state, and the waterproof effect is not ideal. Due to the inverted installation of the rotary support device, the condensed water on the machine parts cannot be discharged. Over time, the condensed water will fill the internal cavity of the rotary support device and enter the sealing component, causing the rotary support device to be flooded. Summary of the invention

[0004] In order to solve the deficiencies in the prior art, the utility model provides a waterproof slewing support device for the problem that the existing sealing position of the offshore crane slewing support device does not match the installation state, and the internal condensed water cannot be discharged. The waterproof slewing support device is provided with a water isolation groove on the lower plane of the cantilever connecting plate, a water flow groove on the upper plane of the column upper connecting plate, and an inner and outer double seal of the sealing ring between the outer shell and the inner ring, and an inner water guide groove is provided on the inner ring, and an outer water guide groove is provided on the outer shell, so as to solve the technical problems of matching the sealing position of the offshore platform crane slewing support device and draining the internal condensed water.

[0005] The solution adopted by the utility model to solve the technical problem is:

[0006] A waterproof rotary mechanism comprises an inverted mounted rotary reducer, a column upper connecting plate on a column assembly connected to the lower part of the rotary reducer, and a cantilever connecting plate on a cantilever device connected to the upper part of the rotary reducer;

[0007] The cantilever connecting plate covers the rotary reducer, and a water blocking groove is arranged on the lower plane of the cantilever connecting plate to prevent the eaves water of the cantilever connecting plate from flowing into the rotary reducer;

[0008] The rotary reducer includes an outer shell, an inner ring and an outer ring. A sealing ring is arranged between the outer shell and the inner ring, so that the rotary reducer forms a closed space. A water guide groove is arranged on the rotary reducer to smoothly drain the accumulated water on the sealing ring.

[0009] The connecting plate on the column carries the rotary reducer, and a water flow trough is arranged on the plane of the connecting plate on the column to guide out the condensed water generated by the cavity formed between the rotary reducer and the cantilever connecting plate.

[0010] In order to further solve the technical problem to be solved by the utility model, the sealing ring provided by the utility model includes an outer sealing ring and an inner sealing ring. The inner sealing ring is arranged between the inner ring and the outer ring to prevent water from entering the rotary reducer from the inside, forming an inner seal; the outer sealing ring is arranged between the outer ring and the outer shell to prevent water from entering the rotary reducer from the outside, forming an outer seal; the outer sealing ring and the inner sealing ring are between the inner ring and the outer shell to form an inner and outer double seal of an inner seal and an outer seal, so that the rotary reducer is in a confined space to prevent water from entering the rotary reducer from both the inside and the outside.

[0011] Furthermore, the water guide groove on the rotary reducer includes an inner water guide groove and an outer water guide groove; the inner ring of the rotary reducer is arranged with an inner water guide groove, the groove depth of the inner water guide groove is lower than the upper plane of the inner sealing ring, and is used to guide the accumulated water on the inner sealing ring and drip along the inner diameter of the inner ring to the upper plane of the connecting plate on the column;

[0012] Furthermore, an external water guide groove is arranged on the outer shell of the rotary reducer. The groove depth of the external water guide groove is lower than the upper plane of the outer sealing ring. It is used to guide the accumulated water on the outer sealing ring and flow along the outer shell to the edge of the connecting plate on the column and drip.

[0013] Positive effects:

[0014] 1. Since an inner and outer double seal is arranged between the outer shell and the inner ring, an inner seal is arranged between the inner ring and the outer ring, which can prevent water from entering the rotary reducer from the inside, forming an inner seal; an outer seal is arranged between the outer ring and the outer shell, which can prevent water from entering the rotary reducer from the outside, forming an outer seal; therefore, an inner and outer double seal of the inner seal and the outer seal can be formed, so that the rotary reducer constitutes a closed space, preventing water from entering the interior of the rotary reducer, and improving the waterproof performance of the rotary reducer.

[0015] 2. Since the inner ring is provided with an inner water guide groove whose groove depth is lower than the upper plane of the inner sealing ring, the accumulated water on the inner sealing ring can be discharged; the outer shell is provided with an outer water guide groove whose groove depth is lower than the upper plane of the outer sealing ring, the accumulated water on the outer sealing ring can be discharged; therefore, drainage channels are provided on the inner sealing ring and the outer sealing ring to discharge the accumulated water thereon, avoid erosion, and further improve the waterproof performance.

[0016] 3. Since a water blocking groove is provided on the lower plane of the cantilever connecting plate, when water flows down along the cantilever connecting plate, it is blocked by the water blocking groove on the lower plane of the cantilever connecting plate; therefore, the water flow can drip along the outer edge of the cantilever connecting plate to avoid entering the interior of the rotary reducer.

[0017] 4. Since a water flow groove is provided on the upper plane of the connecting plate on the column, when condensed water is generated inside the rotary reducer, the upper plane of the connecting plate on the column can flow out to the outside of the rotary reducer through the water flow groove.

[0018] According to the actual working conditions of the offshore platform crane, the utility model aims at the working state of the inverted installation of the rotary reducer, and sets a water blocking groove to block the water flowing down the cantilever connecting plate from entering the interior of the rotary reducer; sealing rings are respectively installed on the inner and outer sides of the rotary reducer, so that the rotary reducer is in a closed space; the water flow groove can guide the condensation water generated in the internal cavity and the water on the sealing ring, and can prevent rainwater, water blown by the wind and condensation water on the components from entering the rotary reducer; the waterproof effect of the rotary reducer of the offshore crane is improved, the rotary reducer is prevented from being corroded by water ingress, the operation is more stable, and the service life of the rotary reducer is extended. It is suitable for use as a waterproof protection structure of the rotary support device of the offshore crane. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 This is a schematic diagram of the main structure of this embodiment:

[0021] Figure 2 This is a top view of DD in this embodiment;

[0022] Figure 3 This is a bottom view of DD of this embodiment;

[0023] Figure 4 This is a top view of CC of this embodiment;

[0024] Figure 5 This is a top view of BB in this embodiment;

[0025] Figure 6 This is a partial enlarged view of this embodiment I.

[0026] In the figure:

[0027] 1. Column assembly,

[0028] 11. Connecting plate on the column,

[0029] 111. Water trough,

[0030] 2. Cantilever device,

[0031] 21.Cantilever connecting plate,

[0032] 211. Water trap,

[0033] 3. Rotary reducer,

[0034] 31. Shell,

[0035] 311. External water tank,

[0036] 32. Inner circle,

[0037] 321.Inner water conduit,

[0038] 33. Outer circle,

[0039] 34. Sealing ring,

[0040] 341. Outer sealing ring,

[0041] 342. Inner sealing ring. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Although the embodiments of the utility model have been shown and described, it can be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the utility model, and the scope of the utility model is defined by the attached claims and their equivalents. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the utility model.

[0043] As shown in the figure, a waterproof rotary mechanism includes an inverted rotary reducer 3, a column upper connecting plate 11 on a column assembly 1 connected to the lower part of the rotary reducer 3, and a cantilever connecting plate 21 on a cantilever device 2 connected to the upper part of the rotary reducer 3;

[0044] The cantilever connecting plate 21 covers the rotary reducer 3, and a water blocking groove 211 is provided on the lower plane of the cantilever connecting plate 21 to prevent the eaves water of the cantilever connecting plate 21 from flowing into the rotary reducer 3;

[0045] The rotary reducer 3 comprises a housing 31, an inner ring 32 and an outer ring 33. The inner ring 32 and the outer ring 33 are assembled in the housing 31. The outer ring 33 is provided with a driving gear. A sealing ring 34 is provided between the housing 31 and the inner ring 32, so that the rotary reducer 3 forms a closed space. The rotary reducer 3 is provided with a water guide groove for smoothly flowing out the accumulated water on the sealing ring 34.

[0046] The connecting plate 11 on the column carries the rotary reducer 3, and a water flow groove 111 is arranged on the plane of the connecting plate 11 on the column to guide out the condensed water generated by the cavity formed between the rotary reducer 3 and the cantilever connecting plate 21, so that the condensed water is smoothly discharged without accumulation.

[0047] In this embodiment, a sealing ring 34 is provided between the outer shell 31 and the inner ring 32 to provide double seals inside and outside, so that the rotary reducer 3 forms a closed space to prevent water from entering the interior of the rotary reducer 3 .

[0048] Specifically, a water blocking groove 211 is provided on the lower plane of the cantilever connecting plate 21. When water flows down along the cantilever connecting plate 21, it is blocked by the water blocking groove 211 on the lower plane of the cantilever connecting plate 21. The water flow can drip along the outer edge of the cantilever connecting plate 21 to avoid entering the interior of the rotary reducer 3.

[0049] Specifically, when condensed water is generated inside the rotary reducer 3 , the upper plane of the connecting plate 11 on the column can flow out to the outside of the rotary reducer 3 through the water flow groove 111 .

[0050] In order to ensure the stability of the structure of this embodiment, the cantilever connecting plate 21 of the cantilever device 2 is a circular structure. On the lower plane of the cantilever connecting plate 21, a water blocking groove 211 is provided along the edge of the cantilever connecting plate 21. The water blocking groove 211 is an annular groove. The inner diameter of the water blocking groove 211 is larger than the outer diameter of the housing 31 of the rotary reducer 3, forming a dripping eaves, which effectively blocks the water flowing down around the plate edge of the cantilever connecting plate 21 from dripping to the top of the rotary reducer 3.

[0051] In a preferred embodiment, the width of the water blocking groove 211 is 6 to 10 mm and the depth is 3 to 5 mm, so as to block the water flowing down the cantilever connecting plate 21 from entering the interior of the rotary reducer 3 .

[0052] In order to further ensure the stability of the structure of this embodiment, the sealing ring 34 includes an outer sealing ring 341 and an inner sealing ring 342. The inner sealing ring 342 is arranged between the inner ring 32 and the outer ring 33 to prevent water from entering the rotary reducer 3 from the inside to form an inner seal; specifically, the inner sealing ring 342 is inserted into the groove between the inner ring 32 and the outer ring 33 by interference fit;

[0053] The outer sealing ring 341 is arranged between the outer ring 33 and the housing 31 to prevent water from entering the rotary reducer 3 from the outside, thereby forming an outer seal; specifically, the outer sealing ring 341 is inserted into the groove between the housing 31 and the outer ring 33 by interference fit;

[0054] The outer sealing ring 341 and the inner sealing ring 342 are between the inner ring 32 and the outer shell 31, forming an inner and outer double seal, so that the rotary reducer 3 is in a closed space to prevent water from entering the rotary reducer 3 from both the inside and the outside.

[0055] In this embodiment, an inner sealing ring 342 is arranged between the inner ring 32 and the outer ring 33 to prevent water from entering the rotary reducer 3 from the inside, thereby forming an inner seal; an outer sealing ring 341 is arranged between the outer ring 33 and the outer shell 31 to prevent water from entering the rotary reducer 3 from the outside, thereby forming an outer seal; thus, an inner and outer double seal of the inner seal and the outer seal is formed, thereby improving the waterproof performance of the rotary reducer 3.

[0056] In order to optimize the structure of this embodiment, the water guide groove on the rotary reducer 3 includes an inner water guide groove 321 and an outer water guide groove 331;

[0057] The inner ring 32 of the rotary reducer 3 is provided with an inner water guide groove 321, the groove depth of which is lower than the upper plane of the inner sealing ring 342, and is used to guide the accumulated water on the inner sealing ring 342 and drip along the inner diameter of the inner ring 32 to the upper plane of the connecting plate 11 on the column to avoid water erosion;

[0058] In this embodiment, the inner water guide groove 321 is a rectangular groove penetrating the inner ring 32, and four of them are provided, evenly distributed along the circumference of the inner ring 32, and the groove width is 10 to 20 mm;

[0059] As a conventional technical choice, the groove depth of the inner water guide groove 321 is lower than the upper plane of the inner sealing ring 342 by δ=1 mm, so as to ensure that the accumulated water on the inner sealing ring 342 can flow out of the inner ring 32 smoothly.

[0060] In order to further optimize the structure of this embodiment, an outer water guide groove 311 is arranged on the housing 31 of the rotary reducer 3. The depth of the outer water guide groove 311 is lower than the upper plane of the outer sealing ring 341, which is used to guide the accumulated water on the outer sealing ring 341 and flow along the housing 31 to the edge of the connecting plate 11 on the column to drip, thereby avoiding water erosion;

[0061] In this embodiment, the outer water guide groove 311 is a rectangular groove penetrating the outer shell 31, and four of them are provided, evenly distributed along the circumference of the outer shell 31, and the groove width is 10 to 20 mm;

[0062] As a conventional technical choice, the depth of the outer water guide groove 311 is lower than the upper plane of the outer sealing ring 341 by δ=1 mm, so as to ensure that the accumulated water on the outer sealing ring 341 flows out of the housing 31 smoothly.

[0063] In this embodiment, the inner ring 32 is provided with an inner water guide groove 321 whose groove depth is lower than the upper plane of the inner sealing ring 342, which can drain the accumulated water on the inner sealing ring 342; the outer shell 31 is provided with an outer water guide groove 311 whose groove depth is lower than the upper plane of the outer sealing ring 341, which can drain the accumulated water on the outer sealing ring 341; drainage channels are provided on the inner sealing ring 342 and the outer sealing ring 341 to drain the accumulated water thereon to avoid erosion, thereby further improving the waterproof performance.

[0064] In order to further optimize the structure of this embodiment, a water flow groove 111 is provided on the upper plane of the column upper connecting plate 11 of the column assembly 1, which is used to discharge the condensed water generated by the formation of the cavity between the rotary reducer 3 and the cantilever connecting plate 21 to prevent accumulation; at the same time, the accumulated water guided out along the inner water guide groove 321 on the inner sealing ring 342 is dripped onto the upper plane plate edge of the column upper connecting plate 11.

[0065] Preferably, the water flow groove 111 is an arc-shaped groove that crosses the plane of the connecting plate 11 on the column, with an arc radius of 3 to 5 mm and a groove depth of 3 to 5 mm, to ensure that the accumulated water in the inner cavity of the inner sealing ring 342 flows out smoothly.

[0066] An offshore platform crane comprises a column assembly, a cantilever device, a slewing support device, a wire rope hoisting device, a hook and an electric control device. The slewing support device has a waterproof slewing mechanism.

[0067] The working principle of this embodiment:

[0068] In rainy weather, or when water vapor condenses on the crane cantilever, when water flows down the cantilever connecting plate 21, it is blocked by the water blocking groove 211 on the lower plane of the cantilever connecting plate 21, and the water drips along the outer edge of the cantilever connecting plate 21, which can prevent the water from entering the rotary reducer 3.

[0069] When water drops enter the gap of the rotary reducer 3 due to the wind, or condensation water is generated on the surface of the components of the rotary reducer 3 itself, the outer seal ring 341 and the inner seal ring 342 form an inner and outer double seal between the inner ring 32 and the outer shell 31, forming an enclosed space to prevent water from entering the interior of the rotary reducer 3. The accumulated water on the inner seal ring 342 is discharged through the inner water guide groove 321, and the accumulated water on the outer seal ring 341 is discharged through the outer water guide groove 311.

[0070] When condensed water is generated inside the rotary reducer 3 , the upper plane of the connecting plate 11 on the column can flow out to the outside of the rotary reducer 3 through the water flow groove 111 .

[0071] Through the water blocking groove 211, the outer sealing ring 341 and the inner sealing ring 342, the inner water guiding groove 321 and the outer water guiding groove 311, and the water flow groove 111, rainwater, water blown by the wind and condensed water can be prevented from entering the rotary reducer 3, thereby improving the waterproof performance of the rotary reducer 3 and protecting the rotary reducer 3 from water erosion.

[0072] It is worth noting that the contents not described in detail in the specification belong to the prior art known to those skilled in the art, and the column assembly, cantilever device and slewing device are not specifically limited and can be determined using conventional equipment. In this technical solution, the wire rope winch device, hook and electronic control device not mentioned are not shown in the figure because they belong to the prior art and will not be described here.

[0073] Finally, it should be noted that the above is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A waterproof rotary mechanism, characterized by: It comprises an inverted mounted rotary reducer (3), a column upper connecting plate (11) on a column assembly (1) connected to the lower part of the rotary reducer (3), and a cantilever connecting plate (21) on a cantilever device (2) connected to the upper part of the rotary reducer (3); The cantilever connecting plate (21) covers the rotary reducer (3), and a water blocking groove (211) is provided on the lower plane of the cantilever connecting plate (21) to prevent water from flowing from the eaves of the cantilever connecting plate (21) into the rotary reducer (3); The rotary reducer (3) comprises an outer shell (31), an inner ring (32) and an outer ring (33); a sealing ring (34) is arranged between the outer shell (31) and the inner ring (32), so that the rotary reducer (3) forms a closed space; the rotary reducer (3) is provided with a water guide groove for smoothly draining the accumulated water on the sealing ring (34); The column upper connecting plate (11) carries the rotary reducer (3), and a water flow trough (111) is provided on the upper plane of the column upper connecting plate (11) to drain condensed water generated by forming a cavity between the rotary reducer (3) and the cantilever connecting plate (21).

2. A waterproof rotary mechanism according to claim 1, characterized in that: The cantilever connecting plate (21) of the cantilever device (2) is a circular structure. A water blocking groove (211) is provided on the lower plane of the cantilever connecting plate (21) along the edge of the cantilever connecting plate (21). The water blocking groove (211) is an annular groove. The inner diameter of the water blocking groove (211) is larger than the outer diameter of the housing (31) of the rotary reducer (3), forming a dripping eaves, which effectively blocks the water flowing down the edge of the cantilever connecting plate (21) from dripping onto the upper part of the rotary reducer (3) and corroding.

3. A waterproof rotary mechanism according to claim 2, characterized in that: The water blocking groove (211) has a groove width of 6 to 10 mm and a groove depth of 3 to 5 mm, and is used to block water flowing down the cantilever connecting plate (21) from entering the interior of the rotary reducer (3).

4. The waterproof rotary mechanism according to claim 1, characterized in that: The sealing ring (34) comprises an outer sealing ring (341) and an inner sealing ring (342); The inner sealing ring (342) is arranged between the inner ring (32) and the outer ring (33) and is used to prevent water from entering the rotary reducer (3) from the inside, thereby forming an inner seal; The outer sealing ring (341) is arranged between the outer ring (33) and the housing (31) and is used to prevent water from entering the rotary reducer (3) from the outside, thereby forming an external seal; The outer sealing ring (341) and the inner sealing ring (342) are disposed between the inner ring (32) and the outer shell (31), forming an inner and outer double seal, so that the rotary reducer (3) is placed in a closed space, thereby preventing water from entering the rotary reducer (3) from both the inside and the outside.

5. A waterproof rotary mechanism according to claim 4, characterized in that: The water guide groove on the rotary reducer (3) comprises an inner water guide groove (321) and an outer water guide groove (311); An inner water guide groove (321) is arranged on the inner ring (32) of the rotary reducer (3). The groove depth of the inner water guide groove (321) is lower than the upper plane of the inner sealing ring (342) and is used to guide the accumulated water on the inner sealing ring (342) to drip along the inner diameter of the inner ring (32) to the upper plane of the connecting plate (11) on the column to avoid water erosion; An outer water guide groove (311) is arranged on the housing (31) of the rotary reducer (3). The depth of the outer water guide groove (311) is lower than the upper plane of the outer sealing ring (341). The outer water guide groove (311) is used to guide the accumulated water on the outer sealing ring (341) and flow along the housing (31) to drip onto the edge of the connecting plate (11) on the column to avoid water erosion.

6. A waterproof rotary mechanism according to claim 5, characterized in that: The inner water guide groove (321) is a rectangular groove that penetrates the inner ring (32), and is provided with four grooves that are evenly distributed along the circumference of the inner ring (32), and the groove width is 10 to 20 mm; The outer water guide groove (311) is a rectangular groove that penetrates the outer shell (31), and is provided with four grooves that are evenly distributed along the circumference of the outer shell (31), and the groove width is 10 to 20 mm.

7. A waterproof rotary mechanism according to claim 5, characterized in that: The groove depth of the inner water guide groove (321) is lower than the upper plane of the inner sealing ring (342) by δ=1 mm, so as to ensure that the accumulated water on the inner sealing ring (342) can flow out of the inner ring (32) smoothly; The groove depth of the outer water guide groove (311) is lower than the upper plane of the outer sealing ring (341) by δ=1 mm, thereby ensuring that the accumulated water on the outer sealing ring (341) flows out of the outer housing (31) smoothly.

8. A waterproof rotary mechanism according to claim 7, characterized in that: The upper plane of the column upper connecting plate (11) of the column assembly (1) is provided with a water flow groove (111) for discharging condensed water generated by forming a cavity between the rotary reducer (3) and the cantilever connecting plate (21) to prevent accumulation; at the same time, the accumulated water discharged along the inner water guide groove (321) on the inner sealing ring (342) is dripped onto the upper plane of the column upper connecting plate (11).

9. A waterproof rotary mechanism according to claim 8, characterized in that: The water flow groove (111) is an arc-shaped groove that runs across the upper plane of the connecting plate (11) on the column, with an arc radius of 3 to 5 mm and a groove depth of 3 to 5 mm, so as to ensure that the accumulated water in the inner cavity of the inner sealing ring (342) can flow out smoothly.

10. An offshore platform crane comprises a column assembly, a cantilever device, a slewing support device, a wire rope hoisting device, a hook and an electric control device, wherein: The slewing support device comprises a waterproof slewing mechanism as described in any one of claims 1-9.

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