Surge-impact-resistant marine hoisting cylindrical gear speed reducer

Abstract

The utility model provides an anti-surge impact type maritime work hoisting cylindrical gear speed reducer, and relates to the field of maritime work hoisting cylindrical gear speed reducers, the anti-surge impact type maritime work hoisting cylindrical gear speed reducer comprises a lower shell, and the top of the lower shell is provided with a sealing mechanism; the sealing mechanism comprises an upper shell; the inner portion of the speed reducer is efficiently protected through a double-layer sealing structure, the outer layer labyrinth type sealing groove blocks outside impurities, and the inner layer inflation sealing ring is attached to a gap through air pressure expansion to form a barrier. Two-stage gear speed reduction, gear meshing transmission, bearing supporting and gear shaft sealing are adopted in power transmission, lubricating oil leakage and impurity entering are prevented, the sealing performance is improved, corrosion of seawater, salt mist and sand dust is resisted, and failure of internal parts is avoided. The surge impact resistance is enhanced, the stable transmission performance is ensured under complex working conditions, and equipment faults are reduced; the modular structural design facilitates disassembly, assembly and maintenance, prolongs the service life of equipment, and reduces the maintenance cost and downtime of maritime work equipment.

Description

Technical Field

[0001] This utility model relates to the technical field of marine lifting cylindrical gear reducers, and in particular to a surge-resistant marine lifting cylindrical gear reducer. Background Technology

[0002] In the field of marine engineering, offshore lifting equipment is a core component enabling the smooth operation of offshore platform construction, offshore wind power installation, and marine resource extraction. As a key transmission component of offshore lifting equipment, the cylindrical gear reducer converts the high speed of the power source into a low speed suitable for lifting operations, while outputting high torque, directly affecting the efficiency and safety of lifting operations. However, the marine environment is complex and harsh, with persistent factors such as high salt spray, high humidity, and strong surge impacts. Conventional cylindrical gear reducers are insufficient to meet practical requirements in such environments, necessitating technological improvements to enhance performance and ensure stable and reliable operation in the harsh marine environment.

[0003] The existing technology has the following shortcomings:

[0004] 1) Weak sealing protection: Traditional speed reducers mostly use static sealing methods, such as O-ring seals and gasket seals. Under the continuous vibration and displacement of equipment caused by the impact of sea waves, these seals are prone to deformation and aging, which can lead to seawater, salt spray and other contaminants entering the speed reducer. Once impurities enter, they can cause gear corrosion and rust, lubricating oil emulsification and deterioration, which can seriously shorten the service life of the equipment and increase the probability of failure.

[0005] 2) High maintenance difficulty and cost: The existing reducer's structural design is not reasonable enough. The replacement of seals and the maintenance of gears often require the complete disassembly of the equipment. Under the limited conditions of the offshore operating environment, the operation is extremely difficult and time-consuming, resulting in prolonged equipment downtime and a significant increase in downtime costs, which cannot meet the urgent need for efficient maintenance of offshore engineering equipment. Utility Model Content

[0006] This invention employs a dual-layer protective structure of labyrinth seal and pneumatic seal. The outer labyrinth seal groove blocks impurities through a tortuous channel, while the inner EPDM rubber pneumatic seal ring self-adjusts, forming dynamic protection to ensure efficient power transmission and reduce vibration and wear.

[0007] Based on the above optimizations, the problems raised in the background technology are effectively solved: the double-layer sealing structure significantly improves sealing performance, prevents seawater and salt spray intrusion, avoids gear corrosion and lubricant deterioration, and extends equipment service life; the two-stage gear reduction and buffer design enhances the ability to resist surge impact, reduces gear overload wear, and ensures the safety of hoisting operations; the modular structure design facilitates disassembly and maintenance, and seal replacement and gear overhaul do not require complete equipment disassembly, reducing the difficulty of offshore operations and downtime costs, and meeting the needs of efficient maintenance of marine engineering equipment.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a surge-resistant marine lifting cylindrical gear reducer structure, comprising a lower housing, the top of which is provided with a sealing mechanism; the sealing mechanism comprises an upper housing, the bottom of which is fixedly connected with a first labyrinth sealing groove, the top of which is provided with a second labyrinth sealing groove, mounting plates fixedly connected to the outer surfaces of both the lower and upper housings, the lower and upper housings being fixedly connected by mounting plate bolts, and EPDM rubber inflatable sealing rings being movably embedded inside the second labyrinth sealing groove and the mounting plate.

[0009] Preferably, the outer wall of the EPDM rubber inflatable sealing ring is connected to a valve, one end of the valve is fixedly connected to a connecting pipe, one end of the connecting pipe is fixedly connected to the output end of an air pump, and the outer wall of the mounting plate is provided with an assembly groove.

[0010] Preferably, an input shaft end is rotatably connected to the outer surface of the lower housing, and a first reduction gear column is fixedly connected to one end of the input shaft end, with a second reduction gear column meshing with the outer wall of the first reduction gear column.

[0011] Preferably, both ends of the second reduction gear column are fixedly and sealed to the internal rotating shaft of the first sealed rotating bearing, and the external rotating shaft of the first sealed rotating bearing is fixedly and sealed to the internal rotating shaft of the lower housing.

[0012] Preferably, the outer wall of the second reduction gear post is engaged with an output gear post.

[0013] Preferably, a second sealed rotary bearing is fixedly provided at one end of both the first reduction gear column and the output gear column, and the outer wall of the second sealed rotary bearing is rotatably and sealedly connected to the outer surface of the lower housing.

[0014] Preferably, the outer walls of the first labyrinth sealing groove and the outer walls of the second labyrinth sealing groove are mutually sealed and fitted, and the outer wall of the valve is movably disposed on the inner wall of the assembly groove to facilitate the opening and closing of the upper housing.

[0015] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0016] 1. In this utility model, a double-layer sealing structure achieves efficient protection of the reducer's internal components. The outer labyrinthine sealing groove uses a tortuous channel to block external impurities from entering, while the inner inflatable sealing ring relies on air pressure expansion to tightly seal the gaps, forming a dynamic sealing barrier. Power transmission adopts a two-stage gear reduction. Through the meshing transmission between gears, the bearings provide support and sealing for the gear shaft, ensuring stable gear rotation and preventing lubricating oil leakage and impurity entry, thus improving sealing performance. It can effectively resist seawater, salt spray, and sand erosion in the marine environment, preventing internal components from failing due to corrosion and wear. The surge impact resistance is enhanced, ensuring stable transmission performance even under complex working conditions such as wave impact, reducing the frequency of equipment failure. The modular structural design facilitates disassembly and maintenance, extending the equipment's service life and reducing maintenance costs and downtime of marine engineering equipment.

[0017] 2. In this utility model, the inflatable sealing ring is made of EPDM rubber, which has excellent weather resistance, corrosion resistance and elasticity, and can work stably for a long time in a wide temperature range of marine environment from -50℃ to 150℃; the innovative combination of sealing mechanism and transmission components enables the reducer to achieve IP68 protection level, which can adapt to extreme marine engineering scenarios such as deep-sea operations and polar lifting; in addition, the intelligent linkage pressure replenishment design between air pump and sealing ring does not require frequent manual intervention, which greatly improves the reliability of equipment in unattended or ocean operations, and provides technical support for the intelligent upgrading of marine engineering equipment. Attached Figure Description

[0018] Figure 1 This utility model presents a schematic diagram of the main structure of a surge-resistant marine hoisting cylindrical gear reducer;

[0019] Figure 2 This utility model provides a front view structural diagram of a surge-resistant marine lifting cylindrical gear reducer;

[0020] Figure 3 This utility model provides a top-view disassembled structural diagram of a surge-resistant marine hoisting cylindrical gear reducer;

[0021] Figure 4 This utility model presents a schematic diagram of the sealing component structure of a surge-resistant marine lifting cylindrical gear reducer.

[0022] Legend: 1. Lower housing; 2. Sealing mechanism; 201. Upper housing; 202. First labyrinth seal groove; 203. Second labyrinth seal groove; 204. Mounting plate; 205. EPDM rubber inflatable sealing ring; 206. Valve; 207. Connecting pipe; 208. Air pump; 209. Assembly groove; 31. Input shaft end; 32. First reduction gear column; 33. Second reduction gear column; 34. First sealed rotating bearing; 35. Second sealed transmission bearing; 36. Output gear column. Detailed Implementation

[0023] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0024] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0025] As attached Figure 1 -Appendix Figure 4 As shown, this utility model provides a technical solution: Figure 1 As shown, the surge-resistant marine lifting cylindrical gear reducer structure of this embodiment includes a lower housing 1, with a sealing mechanism 2 provided on the top of the lower housing 1; the sealing mechanism 2 includes an upper housing 201, with a first labyrinth sealing groove 202 fixedly connected to the bottom of the upper housing 201, and a second labyrinth sealing groove 203 provided on the top of the lower housing 1; mounting plates 204 are fixedly connected to the outer surfaces of both the lower housing 1 and the upper housing 201, and the lower housing 1 and the upper housing 201 are fixedly connected by bolts through the mounting plates 204; EPDM rubber inflatable sealing rings are movably embedded inside the second labyrinth sealing groove 203 and the mounting plates 204. 205. The split design of the lower shell 1 and the top sealing mechanism 2 forms a modular structure of "base + sealing cover", which facilitates the installation, commissioning and later maintenance of the internal gear components. Value in marine engineering scenarios: Marine lifting equipment often needs to operate under complex conditions such as ship swaying and wave impact. The modular structure can reduce the installation error of the whole machine and improve the impact resistance stability of the equipment. Sealing principle: The first labyrinth sealing groove 202 and the second labyrinth sealing groove 203 form a physical barrier through concave and convex meshing. Combined with the expansion sealing of the EPDM rubber inflatable sealing ring 205, a dual sealing system of "mechanical labyrinth + elastic extrusion" is constructed.

[0026] As attached Figure 1 -Appendix Figure 4As shown, the outer wall of the EPDM rubber inflatable sealing ring 205 is connected to a valve 206. One end of the valve 206 is fixedly connected to a connecting pipe 207, and one end of the connecting pipe 207 is fixedly connected to the output end of the air pump 208. The outer wall of the mounting plate 204 has an assembly groove 209. Surge resistance: Wave impact can cause instantaneous pressure fluctuations in the equipment. The labyrinth groove's tortuous channels can buffer the pressure of seawater intrusion. The inflatable sealing ring, through adaptive air pressure adjustment (air pump 208 provides real-time pressure replenishment), ensures that the sealing surface is always tightly attached to the shell, preventing seawater and salt spray from seeping into the gearbox. Material properties: EPDM rubber has excellent resistance to seawater corrosion and ozone aging, maintaining elasticity within a temperature range of -50℃ to 150℃, and is suitable for high-salt-spray environments in the ocean. In environments with large temperature differences, dynamic air-filled sealing is achieved through the linkage between the air valve 206 and the air pump 208. This allows for automatic adjustment of the sealing ring's expansion based on external water pressure (e.g., when pressure increases due to wave impact, the sealing ring adheres tightly to the housing gap). Compared to traditional static sealing rings, this dynamic adaptation to changing operating conditions prevents sealing failure due to vibration. Functional advantages include: the air pump 208 monitors the sealing ring's air pressure in real time. When wave impact causes a sudden increase in external water pressure, it automatically replenishes air through the connecting pipe 207, maintaining the internal pressure of the sealing ring higher than the external water pressure, forming a "pressure barrier" to prevent seawater backflow. Energy-saving design: Under non-impact conditions, the air pump operates intermittently as needed, reducing energy consumption. The limiting design of the assembly slot 209 on the air valve 206 prevents pipe twisting and leakage during air replenishment, improving system reliability.

[0027] As attached Figure 1 -Appendix Figure 4 As shown, an input shaft end 31 is rotatably connected to the outer surface of the lower housing 1. One end of the input shaft end 31 is fixedly connected to a first reduction gear column 32. A second reduction gear column 33 meshes with the outer wall of the first reduction gear column 32. The torque amplification principle is as follows: the input shaft end 31 drives the first reduction gear column 32 to mesh with the second reduction gear column 33, and then the second reduction gear column 33 meshes with the output gear column 36, realizing two-stage reduction to convert the input high speed into the output large torque. Surge resistance application: during marine engineering hoisting, surge impact can cause instantaneous load fluctuations. The two-stage gear transmission avoids sudden changes in output shaft torque through the buffering effect of gear meshing, protecting the safety of hoisting equipment.

[0028] As attached Figure 1 -Appendix Figure 4As shown, both ends of the second reduction gear column 33 are fixedly and sealed to the internal rotating shaft of the first sealed rotating bearing 34. The external rotating shaft of the first sealed rotating bearing 34 is fixedly and sealed to the internal shaft of the lower housing 1. The outer wall of the second sealed rotating bearing 35 is rotatably and sealed to the outer surface of the lower housing 1. Sealing advantages: The bearing adopts a double lip seal structure. The inner lip prevents lubricating oil leakage, and the outer lip isolates seawater and sand. Combined with the sealing and fixing of the bearing seat and the housing, a double sealing node of "bearing + housing" is formed. Vibration resistance design: The outer ring of the bearing is interference-fitted with the housing, and the inner ring is tightened with the gear shaft, reducing radial runout during gear transmission, reducing the risk of bearing fatigue damage caused by wave impact, and extending the service life of the transmission system.

[0029] As attached Figure 1 -Appendix Figure 4 As shown, the outer wall of the second reduction gear column 33 is meshed with the output gear column 36. Through the meshing of the second reduction gear column 33 and the output gear column 36, a complete transmission path of "input shaft end → first-stage reduction gear → second-stage reduction gear → output gear" is formed, which further reduces the input speed to the output speed required by the hoisting equipment to meet the requirements of marine hoisting for high torque and low speed.

[0030] As attached Figure 1 -Appendix Figure 4 As shown, a second sealed rotary bearing 35 is fixedly installed at one end of both the first reduction gear column 32 and the output gear column 36 to ensure the rotational sealing of the gear shaft. The second sealed rotary bearing 35 can prevent external seawater, moisture and impurities from entering the reducer, while avoiding leakage of internal lubricating oil, ensuring the cleanliness and lubrication of the gear transmission system, maintaining normal operation, and supporting the stable rotation of the gear shaft. It provides reliable support for the first reduction gear column 32 and the output gear column 36, reduces radial and axial displacement when the gears rotate, ensures gear meshing accuracy, and reduces vibration and noise during transmission.

[0031] As attached Figure 1 -Appendix Figure 4 As shown, the outer walls of the first labyrinth sealing groove 202 and the second labyrinth sealing groove 203 are mutually sealed and fitted. The outer wall of the valve 206 is movably set on the inner wall of the assembly groove 209 to facilitate the opening and closing of the upper housing 201. The bolt connection of the mounting plate 204: the lower housing 1 and the upper housing 201 are fixed by bolts through the mounting plate 204. Compared with the welded structure, the disassembly and assembly efficiency is improved by 50%, which facilitates the internal cleaning of the gearbox, gear wear detection and lubricant replacement. Valve layout of the assembly groove 209: the valve 206 is embedded in the assembly groove 209, which does not protrude from the housing surface (avoiding collision damage during hoisting operations) and can be quickly inserted and removed for inflation with special tools. During maintenance, there is no need to disassemble the entire sealing mechanism, which improves the convenience of maintenance in marine engineering scenarios.

[0032] Usage and Working Principle: Installation Preparation: Fix the lower housing 1 to the designated installation position of the marine lifting equipment. Connect and fix it to the equipment base through the bolt holes on the mounting plate 204, ensuring stability. Install the first reduction gear column 32, the second reduction gear column 33, and the output gear column 36 into the lower housing 1 in sequence. Install the corresponding second sealing rotary bearing 35 and first sealing rotary bearing 34 in place, ensuring correct meshing between the gears and flexible rotation of the bearings. Sealing Mechanism Installation: Embed the EPDM rubber inflatable sealing ring 205 into the second labyrinth sealing groove 203 at the top of the lower housing 1 and inside the mounting plate 204, ensuring accurate positioning of the sealing ring. Cover the lower housing 1 with the upper housing 201, so that the first labyrinth sealing groove 205... 2. Corresponding to the second labyrinth sealing groove 203, the upper housing 201 and the lower housing 1 are fixedly connected by bolts on the mounting plate 204. At this time, the valve 206 should be located in the assembly groove 209. Inflation test: Connect the valve 206 to the air pump 208 using the connecting pipe 207, turn on the air pump 208, and inflate the EPDM rubber inflatable sealing ring 205. Observe the air pump pressure display, adjust the pressure in the sealing ring to the design pressure value, and ensure that the sealing ring expands and tightly fits the sealing surface to form an effective seal. Equipment operation: Connect the input shaft end 31 to the power source (such as a motor), start the power source, and the power is transmitted to the first reduction gear column 32 through the input shaft end 31. The first reduction gear column 32 meshes with the second reduction gear column 33, and then... The second reduction gear 33 meshes with the output gear 36 to achieve two-stage reduction. The output gear 36 then transmits the reduced and increased torque power to the actuator of the lifting equipment (such as a winch or boom swivel device) for lifting operations. Maintenance and repair: When maintenance or repair of the reducer is required, first turn off the air pump 208, open the air valve 206 to release air, and wait for the EPDM rubber inflation seal ring 205 to contract. Then, remove the bolts on the mounting plate 204 and remove the upper housing 201. Internal gears, bearings, and other components can then be inspected, cleaned, lubricated, or replaced. After maintenance, reinstall the upper housing 201, inflate to the specified pressure, and restore equipment operation. Working principle and sealing principle: This reducer uses a labyrinth seal and inflation... The air-sealing method combines the first labyrinth sealing groove 202 and the second labyrinth sealing groove 203 to form a tortuous channel, which initially blocks the intrusion of seawater and impurities. The EPDM rubber inflatable sealing ring 205 expands after inflation, tightly filling the sealing gap and further enhancing the sealing effect. When the external pressure (such as water pressure changes caused by wave impact) fluctuates, the air pump 208 can automatically adjust according to the set pressure value, replenishing or releasing air into the sealing ring to keep the sealing ring in a good sealing state at all times, preventing external seawater, moisture, sand and dust from entering the reducer, while also preventing internal lubricating oil leakage and protecting the gear transmission system. Transmission principle: Power is input from the input shaft end 31, driving the first reduction gear column 32 to rotate.Since the first reduction gear spur 32 meshes with the second reduction gear spur 33, according to the gear transmission principle, the rotation of the first reduction gear spur 32 is transmitted to the second reduction gear spur 33 through the interaction force between the teeth, achieving first-stage reduction. The second reduction gear spur 33 then meshes with the output gear spur 36, further transmitting power and achieving second-stage reduction. Through two-stage gear reduction, the input high-speed, low-torque power is converted into low-speed, high-torque power, which is output by the output gear spur 36, meeting the power requirements of marine lifting equipment. The bearing working principle: The first sealed rotary bearing 34 and the second sealed rotary bearing 35 provide support and sealing for the gear shaft. The rolling elements (such as balls or rollers) inside the bearings roll between the inner and outer rings, reducing friction during gear shaft rotation and allowing the gear to rotate smoothly. Simultaneously, the bearing's sealing structure (such as lip seals, labyrinth seals, etc.) prevents external impurities from entering the bearing, avoiding bearing wear and grease contamination, ensuring normal bearing operation, extending service life, and guaranteeing the stability and reliability of the gear transmission system.

[0033] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A surge-resistant marine lifting cylindrical gear reducer, characterized in that: Includes a lower housing (1), and a sealing mechanism (2) is provided on the top of the lower housing (1); The sealing mechanism (2) includes an upper housing (201), a first labyrinth sealing groove (202) is fixedly connected to the bottom of the upper housing (201), a second labyrinth sealing groove (203) is provided on the top of the lower housing (1), and mounting plates (204) are fixedly connected to the outer surfaces of both the lower housing (1) and the upper housing (201). The lower housing (1) and the upper housing (201) are fixedly connected by bolts through the mounting plates (204). The second labyrinth sealing groove (203) and the mounting plates (204) are movably embedded with EPDM rubber inflatable sealing rings (205).

2. The surge-resistant marine lifting cylindrical gear reducer according to claim 1, characterized in that: The outer wall of the EPDM rubber inflatable sealing ring (205) is connected to a valve (206), one end of the valve (206) is fixedly connected to a connecting pipe (207), one end of the connecting pipe (207) is fixedly connected to the output end of an air pump (208), and the outer wall of the mounting plate (204) is provided with an assembly groove (209).

3. The surge-resistant marine lifting cylindrical gear reducer according to claim 2, characterized in that: The lower housing (1) is rotatably connected to an input shaft end (31), and one end of the input shaft end (31) is fixedly connected to a first reduction gear column (32). The outer wall of the first reduction gear column (32) is meshed with a second reduction gear column (33).

4. The surge-resistant marine lifting cylindrical gear reducer according to claim 3, characterized in that: Both ends of the second reduction gear column (33) are fixedly and sealed to the internal rotating shaft of the first sealed rotating bearing (34), and the external rotating shaft of the first sealed rotating bearing (34) is fixedly and sealed to the internal of the lower housing (1).

5. A surge-resistant marine lifting cylindrical gear reducer according to claim 4, characterized in that: The outer wall of the second reduction gear column (33) is engaged with the output gear column (36).

6. The surge-resistant marine lifting cylindrical gear reducer according to claim 3, characterized in that: A second sealed rotary bearing (35) is fixedly provided at one end of the first reduction gear column (32) and the output gear column (36). The outer wall of the second sealed rotary bearing (35) is rotatably sealed to the outer surface of the lower housing (1).

7. A surge-resistant marine lifting cylindrical gear reducer according to claim 2, characterized in that: The outer walls of the first labyrinth sealing groove (202) and the second labyrinth sealing groove (203) are mutually sealed and fitted together. The outer wall of the valve (206) is movably disposed on the inner wall of the assembly groove (209) so as to facilitate the opening and closing of the upper housing (201).

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