Self-lubricating structure of crane slewing gear

Abstract

The self-lubricating structure of the crane slewing device comprises a motor, a speed reducer is installed at the bottom of the motor, a gear shaft is connected to the speed reducer, the outer side of the gear shaft is sleeved with a gear and a self-lubricating reinforcing sleeve, the self-lubricating reinforcing sleeve is located above the gear, and a supporting mechanism is arranged between the self-lubricating reinforcing sleeve and the speed reducer. A driving mechanism and a limiting mechanism are arranged on the outer side of the gear shaft. The self-lubricating structure of the slewing gear of the crane is economical and efficient, and can effectively cope with the working condition of large radial force.

Description

Technical Field

[0001] The utility model belongs to the field of offshore lifting equipment, in particular to a self-lubricating structure of a crane slewing device. Background Art

[0002] Marine cranes are lifting equipment specifically designed for offshore or port operations. They play a vital role in a variety of fields, including cargo handling, ship maintenance, and marine engineering. Compared to land-based cranes, marine cranes must not only meet the basic functional requirements of ordinary cranes, such as lifting heavy objects, but also adapt to more complex and changing working environments, including but not limited to factors such as strong winds, wave impacts, and salt spray corrosion.

[0003] As a core component of a marine crane, the slewing mechanism is responsible for achieving horizontal rotation of the entire boom system, enabling the crane to flexibly adjust its working position to cover a wider operating range. This mechanism typically consists of key components such as a drive motor, a reducer, and a bearing system. The reducer increases torque by reducing the motor's output speed, effectively controlling and executing precise and smooth slewing motion. Furthermore, good lubrication is crucial for ensuring the proper operation of the slewing mechanism, not only reducing wear and extending its service life but also effectively preventing heat accumulation caused by friction that can lead to failure.

[0004] Although a variety of marine cranes and their associated slewing devices are currently available on the market, some pressing challenges remain in their practical application. This is particularly true under extreme operating conditions. When the crane operates in a non-horizontal position, particularly when slewing uphill, the gear shaft at the reducer output is subject to significant radial loads. While standard gearboxes provide ample slewing torque, they are insufficient for handling the additional radial forces. To address this issue, the industry has generally adopted a strategy of increasing the size of the reducer, employing products with higher torque ratings. However, this approach not only increases manufacturing costs but can also lead to an excessively large overall size, impacting installation layout and ultimately the end-user experience. Utility Model Content

[0005] The utility model aims to provide a self-lubricating structure for a crane slewing device, so as to solve the technical problem of insufficient radial bearing capacity of a slewing reducer when slewing under inclined working conditions.

[0006] To achieve the above-mentioned purpose, the specific technical solution of the self-lubricating structure of a crane slewing device of the present invention is as follows:

[0007] A self-lubricating structure for a crane slewing device includes a motor, a reducer mounted at the bottom of the motor, a gear shaft connected to the reducer, a gear and a self-lubricating reinforcement sleeve sleeved on the outer side of the gear shaft, the self-lubricating reinforcement sleeve located above the gear, a support mechanism provided between the self-lubricating reinforcement sleeve and the reducer, and a driving mechanism and a limiting mechanism provided on the outer side of the gear shaft;

[0008] The support mechanism includes a mounting ring fixed to the outside of the reducer, the bottom of the mounting ring is symmetrically fixedly connected to two L-shaped plates, the inner bottom walls of the two L-shaped plates are fixedly connected to positioning posts, the outer side of the self-lubricating reinforcement sleeve is fixedly sleeved with an outer ring, the outer side of the outer ring is symmetrically rotatably connected to two side shafts, the outer sides of the two side shafts are fixedly sleeved with L-shaped plates, the inner top walls of the two L-shaped plates are respectively fitted with the inner bottom walls of the two L-shaped plates, and the two L-shaped plates are respectively sleeved on the outside of the two positioning posts;

[0009] The driving mechanism includes a U-shaped frame fixed to the bottom of the mounting ring, and a lifting plate is provided at the bottom of the U-shaped frame. The lifting plate is movably sleeved on the outside of the two L-shaped round rods, and the top of the lifting plate abuts against the bottom of the lifting ring;

[0010] The limiting mechanism includes two plug rods symmetrically located at the bottom of the U-shaped frame. Two plug tubes are symmetrically fixedly connected to the outer side of the outer ring. The inner diameters of the two plug tubes are equal to the outer diameters of the two plug rods.

[0011] As a further improvement of the present invention, a lifting ring is provided on the outer side of the gear shaft, which is located between the two L-shaped plates. The bottom of the lifting ring is symmetrically fixedly connected to two U-shaped plates, and the two U-shaped plates are respectively located directly above the two positioning columns.

[0012] As a further improvement of the present invention, the inner sides of the two L-shaped plates are fixedly connected with L-shaped round rods, the lifting rings are movably sleeved on the outer sides of the two L-shaped round rods, the outer sides of the two L-shaped round rods are fixedly sleeved with fixing rings, and the two fixing rings are both located above the lifting rings, and springs are fixedly connected between the two fixing rings and the lifting rings, and the two springs are respectively sleeved on the outer sides of the two L-shaped round rods.

[0013] As a further improvement of the present invention, the bottom of the U-shaped frame is fixedly connected to a bottom cylinder, the gear shaft passes through the U-shaped frame and the bottom cylinder, and the gear shaft does not contact the U-shaped frame and the bottom cylinder, a collar is provided on the outside of the bottom cylinder, and a plurality of auxiliary rods are fixedly connected at equal angles to the bottom of the collar, an annular groove is provided on the outside of the collar, and the lifting plate is rotatably connected to the collar through the annular groove.

[0014] As a further improvement of the present invention, the outer side of the base tube is provided with an external thread, the inner side of the collar is provided with an internal thread matching the external thread, and the collar thread is sleeved on the outer side of the base tube.

[0015] As a further improvement of the present invention, two U-shaped round rods are symmetrically fixedly connected to the bottom of the U-shaped frame, and sliders are movably sleeved on the outer sides of the two U-shaped round rods. Abutment wheels located at the bottom of the U-shaped frame are installed on the tops of the two sliders, and the tops of the two insertion rods are respectively fixed to the bottoms of the two sliders.

[0016] As a further improvement of the present invention, two side blocks are symmetrically fixedly installed on the outer side of the lifting plate, and the outer sides of the two side blocks are rotatably connected to movable rods, and the top ends of the two movable rods are rotatably connected to the bottoms of the two sliders respectively.

[0017] Beneficial effects:

[0018] By adding a self-lubricating reinforcement sleeve to the outside of the gear shaft, combined with components such as the mounting ring, L-shaped plate, and positioning column in the support mechanism, the reducer's output end's ability to withstand radial forces is effectively improved. This design not only reduces mechanical wear caused by excessive radial loads but also enhances the stability and reliability of the entire rotary system.

[0019] The cooperation between the side shaft and L-shaped plate 2, and between the positioning column and L-shaped plate 1, facilitates the placement of the outer ring. The cooperation between the L-shaped rod and the lifting ring, and between the spring and the fixed ring, facilitates the two U-shaped plates to descend and respectively fit over the outer sides of the two positioning columns, so that the two U-shaped plates can respectively clamp and fix the two L-shaped plates 2, facilitating the installation of the self-lubricating reinforcement sleeve on the outer side of the gear shaft, thereby reducing the influence of the radial force of the gear shaft on the reducer, thereby increasing the radial bearing capacity of the reducer and realizing the miniaturization of the crane slewing mechanism. The cooperation between the bottom cylinder, the sleeve ring and the annular groove facilitates the sliding of the lifting plate along the two L-shaped rods. When the lifting plate rises, it pushes the lifting ring, causing the two U-shaped plates to rise. At the same time, both springs are compressed, facilitating the placement of the two L-shaped plates 2 on the two L-shaped plates 1. When the lifting plate descends, the restriction effect on the lifting ring is released, allowing the lifting ring to slide downward along the two L-shaped rods under the action of the two springs, thereby facilitating the two U-shaped plates to descend and respectively clamp the two L-shaped plates 2. Through the cooperation between the bottom cylinder, the sleeve ring and the annular groove, the lifting plate can slide downward along the two L-shaped round rods, and through the cooperation between the side block and the movable rod and the slider and the U-shaped round rod, the two insertion rods can be approached to each other and inserted into the two insertion cylinders respectively, which can limit the position of the outer ring, thereby facilitating the stable installation of the self-lubricating reinforcement sleeve.

[0020] Compared to the traditional approach of selecting a reducer with a higher torque rating to cope with greater radial forces, the introduction of a self-lubricating reinforcement sleeve and an improved support structure reduces the overall cost of the equipment without sacrificing performance. Furthermore, the compact design helps reduce the overall size of the machine, making it easier to install and transport.

[0021] The application of self-lubricating reinforcement sleeves simplifies daily maintenance work, especially in harsh working environments such as offshore operations, which can significantly reduce the need for manual lubrication, thereby extending the service life of the equipment and reducing maintenance costs.

[0022] The design of the drive and limit mechanisms ensures the crane maintains excellent maneuverability under varying operating conditions. For example, the lifting platform, U-shaped frame, bottom drum, and collar all work together to ensure smooth operation of the gear shaft while providing the necessary position adjustment to accommodate changing operating requirements.

[0023] The rod and the cylinder in the limit mechanism cooperate to limit certain ranges of motion under specific circumstances, preventing accidental movement or overload operation, and further ensuring the safety of the operator.

[0024] The utility model improves energy transmission efficiency and reduces unnecessary energy loss by optimizing the design of key components, thereby making the entire rotary device more efficient and energy-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of a self-lubricating structure of a crane slewing device of the utility model;

[0026] Figure 2 Schematic diagram of the supporting mechanism structure;

[0027] Figure 3 This is a schematic diagram of the disassembled structure of the outer ring and the lifting ring;

[0028] Figure 4 Schematic diagram of the driving mechanism structure;

[0029] Figure 5 This is a schematic diagram of the disassembled structure of the bottom cylinder and the lifting plate;

[0030] Figure 6 Schematic diagram of the limiting mechanism structure;

[0031] Figure 7 Schematic diagram of the rod structure.

[0032] Explanation of the marks in the figure: 1. Motor; 2. Support mechanism; 201. Mounting ring; 202. L-shaped plate 1; 203. Spring; 204. L-shaped round rod; 205. L-shaped plate 2; 206. Outer ring; 207. U-shaped plate; 208. Lifting ring; 209. Fixed ring; 2010. Positioning column; 2011. Side shaft; 3. Driving mechanism; 301. U-shaped frame; 302. Bottom cylinder; 303. Lifting plate; 304. Ring; 305. Auxiliary rod; 306. Annular groove; 4. Limiting mechanism; 401. Insert rod; 402. Insert cylinder; 403. Movable rod; 404. Side block; 405. Slider; 406. Abutment wheel; 407. U-shaped round rod; 5. Gear; 6. Gear shaft; 7. Self-lubricating reinforcement sleeve; 8. Reducer. DETAILED DESCRIPTION

[0033] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0034] Implementation example:

[0035] like Figure 1-7 The self-lubricating structure of a crane slewing device shown includes a motor 1, a reducer 8 is installed at the bottom of the motor 1, a gear shaft 6 is connected to the reducer 8, a gear 5 and a self-lubricating reinforcement sleeve 7 are sleeved on the outer side of the gear shaft 6, the self-lubricating reinforcement sleeve 7 is located above the gear 5, a support mechanism 2 is provided between the self-lubricating reinforcement sleeve 7 and the reducer 8, and a driving mechanism 3 and a limiting mechanism 4 are provided on the outer side of the gear shaft 6.

[0036] The support mechanism 2 includes a mounting ring 201 fixed to the outside of the reducer 8. The bottom of the mounting ring 201 is symmetrically fixedly connected to two L-shaped plates 202. The inner bottom walls of the two L-shaped plates 202 are fixedly connected to positioning columns 2010. The outer side of the self-lubricating reinforcement sleeve 7 is fixedly sleeved with an outer ring 206. The outer side of the outer ring 206 is symmetrically rotatably connected to two side shafts 2011. The outer sides of the two side shafts 2011 are fixedly sleeved with L-shaped plates 205. The inner top walls of the two L-shaped plates 205 are respectively fitted with the inner bottom walls of the two L-shaped plates 202, and the two L-shaped plates 205 are respectively sleeved on the outer sides of the two positioning columns 2010. The outer side of the gear shaft 6 is provided with a lifting ring 208. , the lifting ring 208 is located between the two L-shaped plates 202, and the bottom of the lifting ring 208 is symmetrically fixedly connected to two U-shaped plates 207. The two U-shaped plates 207 are respectively located directly above the two positioning columns 2010. The inner sides of the two L-shaped plates 202 are fixedly connected with L-shaped round rods 204. The lifting ring 208 is movably sleeved on the outer sides of the two L-shaped round rods 204. The outer sides of the two L-shaped round rods 204 are fixedly sleeved with fixing rings 209, and the two fixing rings 209 are both located above the lifting ring 208. Springs 203 are fixedly connected between the two fixing rings 209 and the lifting ring 208. The two springs 203 are respectively sleeved on the outer sides of the two L-shaped round rods 204.

[0037] First, slide the lifting ring 208 upward along the two L-shaped round rods 204, driving the two U-shaped plates 207 to rise. At this time, the two springs 203 are compressed. Then, the self-lubricating reinforcement sleeve 7 is put on the outside of the gear shaft 6, and then the two L-shaped plates 205 are rotated and put on the outside of the two positioning columns 2010 respectively, until the inner top walls of the two L-shaped plates 205 respectively abut against the inner bottom walls of the two L-shaped plates 1 202, and then release the lifting ring 208. At this time, the two springs 203 are reset and drive the lifting ring 208 to slide downward along the two L-shaped round rods 204. At the same time, the two U-shaped plates 207 descend and are respectively put on the outside of the two positioning columns 2010 until the two U-shaped plates 207 respectively abut against the two L-shaped plates 205, completing the installation and fixation of the self-lubricating reinforcement sleeve 7, reducing the influence of the radial force of the gear shaft 6 on the reducer 8, and finally increasing the radial bearing capacity of the reducer 8, thereby realizing the miniaturization of the crane slewing mechanism.

[0038] The driving mechanism 3 includes a U-shaped frame 301 fixed to the bottom of the mounting ring 201, and a lifting plate 303 is provided at the bottom of the U-shaped frame 301. The lifting plate 303 is movably sleeved on the outer sides of the two L-shaped round rods 204, and the top of the lifting plate 303 abuts against the bottom of the lifting ring 208. The bottom of the U-shaped frame 301 is fixedly connected to the bottom of the bottom cylinder 302, and the gear shaft 6 passes through the U-shaped frame 301 and the bottom cylinder 302, and the gear shaft 6 does not contact the U-shaped frame 301 and the bottom cylinder 302. A collar 304 is provided on the outer side of the bottom cylinder 302, and a plurality of auxiliary rods 305 are fixedly connected to the bottom of the collar 304 at equal angles. An annular groove 306 is provided on the outer side of the collar 304, and the lifting plate 303 is rotatably connected to the collar 304 through the annular groove 306. The outer side of the bottom cylinder 302 is provided with an external thread, and the inner side of the collar 304 is provided with an internal thread matching the external thread, and the collar 304 is threadedly sleeved on the outer side of the bottom cylinder 302;

[0039] When the lifting plate 303 is lifted up, the lifting ring 208 is pushed upward, and the two U-shaped plates 207 are lifted up. At the same time, the two springs 203 are compressed, making it easier to place the two L-shaped plates 205 on the two L-shaped plates 1 202 respectively. When the lifting plate 303 is lowered, the restriction effect of the lifting ring 208 is released. At this time, the lifting ring 208 slides downward along the two L-shaped rods 204 under the action of the elastic force of the two springs 203. Finally, the two U-shaped plates 207 descend to complete the clamping and fixing of the two L-shaped plates 205.

[0040] The limiting mechanism 4 includes two insertion rods 401 symmetrically located at the bottom of the U-shaped frame 301, two insertion tubes 402 are symmetrically fixedly connected to the outside of the outer ring 206, the inner diameters of the two insertion tubes 402 are equal to the outer diameters of the two insertion rods 401, and two U-shaped round rods 407 are symmetrically fixedly connected to the bottom of the U-shaped frame 301. The outer sides of the two U-shaped round rods 407 are movably sleeved with sliders 405, and the tops of the two sliders 405 are installed with abutment wheels 406 located at the bottom of the U-shaped frame 301. The tops of the two insertion rods 401 are respectively fixed to the bottoms of the two sliders 405, and two side blocks 404 are symmetrically fixedly installed on the outside of the lifting plate 303. The outer sides of the two side blocks 404 are rotatably connected to movable rods 403, and the tops of the two movable rods 403 are respectively rotatably connected to the bottoms of the two sliders 405;

[0041] First, the rotating ring 304 drives the lifting plate 303 to slide downward along the two L-shaped round rods 204, and drives the two side blocks 404 to descend, and then drives the two sliders 405 to slide along the two U-shaped round rods 407 respectively through the two movable rods 403. At the same time, the two abutment wheels 406 roll on the bottom of the U-shaped frame 301 to ensure the stability of the two sliders 405 when moving, and then drives the two insertion rods 401 to approach each other and insert them into the two insertion tubes 402 respectively, limits the position of the outer ring 206, and finally completes the stable installation of the self-lubricating reinforcement sleeve 7.

[0042] It is understood that the present invention is described by way of certain embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. Furthermore, under the guidance of the present invention, these features and embodiments may be modified to suit specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. A self-lubricating structure for a crane slewing device, characterized in that: The invention comprises a motor, a reducer is installed at the bottom of the motor, a gear shaft is connected to the reducer, a gear and a self-lubricating reinforcement sleeve are sleeved on the outer side of the gear shaft, the self-lubricating reinforcement sleeve is located above the gear, a support mechanism is provided between the self-lubricating reinforcement sleeve and the reducer, and a driving mechanism and a limiting mechanism are provided on the outer side of the gear shaft; The support mechanism includes a mounting ring fixed to the outside of the reducer, the bottom of the mounting ring is symmetrically fixedly connected to two L-shaped plates, the inner bottom walls of the two L-shaped plates are fixedly connected to positioning posts, the outer side of the self-lubricating reinforcement sleeve is fixedly sleeved with an outer ring, the outer side of the outer ring is symmetrically rotatably connected to two side shafts, the outer sides of the two side shafts are fixedly sleeved with L-shaped plates, the inner top walls of the two L-shaped plates are respectively fitted with the inner bottom walls of the two L-shaped plates, and the two L-shaped plates are respectively sleeved on the outside of the two positioning posts; The driving mechanism includes a U-shaped frame fixed to the bottom of the mounting ring, and a lifting plate is provided at the bottom of the U-shaped frame. The lifting plate is movably sleeved on the outside of the two L-shaped round rods, and the top of the lifting plate abuts against the bottom of the lifting ring; The limiting mechanism includes two plug rods symmetrically located at the bottom of the U-shaped frame. Two plug tubes are symmetrically fixedly connected to the outer side of the outer ring. The inner diameters of the two plug tubes are equal to the outer diameters of the two plug rods.

2. The self-lubricating structure of the crane slewing device according to claim 1, characterized in that: A lifting ring is provided on the outer side of the gear shaft, and the lifting ring is located between the two L-shaped plates. The bottom of the lifting ring is symmetrically fixedly connected with two U-shaped plates, and the two U-shaped plates are respectively located directly above the two positioning columns.

3. The self-lubricating structure of the crane slewing device according to claim 1, characterized in that: The inner sides of the two L-shaped plates are fixedly connected with L-shaped round rods, the lifting rings are movably sleeved on the outer sides of the two L-shaped round rods, the outer sides of the two L-shaped round rods are fixedly sleeved with fixing rings, and the two fixing rings are both located above the lifting rings, and springs are fixedly connected between the two fixing rings and the lifting rings, and the two springs are respectively sleeved on the outer sides of the two L-shaped round rods.

4. The self-lubricating structure of the crane slewing device according to claim 1, characterized in that: The bottom of the U-shaped frame is fixedly connected to the bottom cylinder, the gear shaft passes through the U-shaped frame and the bottom cylinder, and the gear shaft does not contact the U-shaped frame and the bottom cylinder. A collar is provided on the outside of the bottom cylinder, and a plurality of auxiliary rods are fixedly connected at equal angles to the bottom of the collar. An annular groove is provided on the outside of the collar, and the lifting plate is rotatably connected to the collar through the annular groove.

5. The self-lubricating structure of the crane slewing device according to claim 4, characterized in that: The outer side of the bottom cylinder is provided with an external thread, the inner side of the collar is provided with an internal thread matching the external thread, and the collar thread is sleeved on the outer side of the bottom cylinder.

6. The self-lubricating structure of the crane slewing device according to claim 5, characterized in that: The bottom of the U-shaped frame is symmetrically fixed with two U-shaped round rods, the outer sides of the two U-shaped round rods are movably sleeved with sliders, the tops of the two sliders are equipped with abutment wheels located at the bottom of the U-shaped frame, and the tops of the two insertion rods are respectively fixed to the bottoms of the two sliders.

7. The self-lubricating structure of the crane slewing device according to claim 1, characterized in that: Two side blocks are symmetrically fixedly installed on the outer side of the lifting plate. The outer sides of the two side blocks are rotatably connected with movable rods, and the top ends of the two movable rods are rotatably connected to the bottoms of the two sliding blocks respectively.

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