Static balance test bench for marine coupling

Abstract

The utility model belongs to the technical field of marine shafting transmission device couplings, and particularly relates to a marine coupler static balance test bench, which comprises a hydraulic bearing and a static balance tool, and is characterized in that the hydraulic bearing is composed of a bearing seat and a bearing bush in the bearing seat; the two ends of the static balance tool are of columnar structures and are in clearance fit with bearing bushes of the hydraulic bearings respectively, stable rotation is achieved through supporting of the hydraulic bearings, the static balance tool is of a sectional structure and comprises a first supporting shaft, a second supporting shaft and a plurality of stepped shafts, the first supporting shaft and the second supporting shaft are connected with the hydraulic bearings on the two sides, and the stepped shafts are located between the first supporting shaft and the second supporting shaft. The coupler is arranged on the static balance tool in a sleeving mode, located between the two hydraulic bearings and coaxially rotates with the static balance tool. The problems that an existing test bench is insufficient in test precision, poor in structural adaptability and low in stability are solved, and the detection precision of static balance test, the capability of adapting to diversified structures, the vibration resistance and the stability are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of marine shafting transmission device couplings, and in particular relates to a static balance test bench for marine couplings. Background Art

[0002] Couplings are crucial connecting components in marine transmission systems. Their primary functions include transmitting torque, absorbing vibration, and cushioning shock, thereby ensuring efficient power transfer between the engine and the drive shaft system. Couplings effectively mitigate the impact of uneven engine operation or load fluctuations, reducing internal vibration and noise, and play a key role in the smoothness and durability of the transmission system. Typically, one end of the coupling connects to the output shaft of the power source and the other to the input shaft of the bearing. This flexible connection ensures smooth torque transmission while bearing both axial and radial loads to ensure stable operation of the transmission system.

[0003] In order to ensure the working stability and reliability of the coupling, it is necessary to carry out a static balance test. The goal of the static balance test is to ensure its stability and efficiency under actual operating conditions by analyzing the mass distribution, unbalanced torque, eccentricity and vibration characteristics of the coupling. Currently, static balance tests are usually carried out on static balance test benches. This type of equipment mainly consists of a test base, support components and limit devices. The coupling is installed in a pillow block or fixture on the base, fixed by a dummy shaft and a support plate, and allows the component to rotate freely at all angles. The test process adjusts the counterweight until the system reaches static balance, and finally achieves the balance quality of the coupling.

[0004] However, the design and performance of existing test benches have significant defects, making it difficult to meet the special needs of coupling testing:

[0005] 1. Insufficient test accuracy: As high-precision transmission components, couplings require precise static balance testing. The balance quality level is a key indicator of the operating balance of rotating components. Current test benches cannot meet the high-precision requirements of coupling static balance testing, making it impossible to detect even minor mass deviations and unbalanced torques, impacting the reliability of test results. Because each coupling requires counterweight adjustment based on test results, an inaccurate test bench can lead to improper counterweight adjustment, impacting the coupling's actual performance and reducing the smoothness and durability of the system.

[0006] 2. Insufficient structural adaptability: Existing static balance test benches typically use clamping fixtures. These fixtures are primarily designed for couplings with simple structures and regular shapes, and do not fully consider the complexity and diversity of marine coupling structures. Furthermore, different marine couplings vary significantly in shape, weight, and internal geometry. The clamping fixture only contacts both ends of the coupling, resulting in a loose clamp or the introduction of additional eccentricity. The couplings typically contain multiple components, further contributing to eccentricity or uneven quality. The fixture is designed to be universal, requiring different support and fixture configurations for large and small couplings. However, existing equipment lacks modular components that can be quickly replaced, resulting in time-consuming and inefficient pre-test preparations.

[0007] 3. Insufficient structural stability: The test base of the existing static balance test bench includes an arc-shaped pillow block, and a straight cylindrical dummy shaft is passed through the inside of the coupling. The two ends of the dummy shaft are respectively placed in the arc-shaped grooves of the two pillow blocks. This support form has a small contact area, and the dummy shaft is prone to sliding or offset due to uneven mass distribution of the coupling or its own weight, affecting the positioning accuracy. At the same time, the change in friction between the dummy shaft and the pillow block surface during rotation may cause unstable rotation, especially at low speeds, which has a significant impact on the stability of the test results. In addition, the coupling is large in size and heavy in weight, and the support structure is prone to resonance or deformation during frequent or long-term tests, which further leads to distortion of the test data and cannot meet the stability requirements under high-load conditions.

[0008] Therefore, there is an urgent need for a static balancing test equipment that can ensure high test accuracy while improving the adaptability to the diverse structures of the coupling and the stability of the test process, so as to meet the requirements of modern ship systems for the efficiency and reliability of the coupling. Utility Model Content

[0009] Aiming at the defects of the existing technology, the utility model proposes a static balancing test bench for a marine coupling. The static balancing test bench has high-precision detection, good structural adaptability and vibration resistance, and can meet the requirements of modern ships for coupling balance testing.

[0010] The utility model provides a static balancing test bench for a marine coupling, comprising a hydraulic bearing and a static balancing tool; the hydraulic bearing comprises a bearing seat and a bearing shell installed inside the bearing seat; both ends of the static balancing tool are columnar structures, and the columnar structures at both ends are respectively clearance-matched with the bearing shell of a hydraulic bearing to achieve smooth rotation through the support of the hydraulic bearing; the static balancing tool adopts a segmented structure, comprising a first support shaft and a second support shaft respectively connected to the hydraulic bearings on both sides, and a plurality of stepped shafts located between the first support shaft and the second support shaft; the first support shaft, the plurality of stepped shafts and the second support shaft are axially connected in series in sequence; the coupling is sleeved on the static balancing tool, and is located between the two hydraulic bearings, and rotates coaxially with the static balancing tool.

[0011] In a preferred implementation, further, the stepped shaft includes an axially connected first stepped shaft and a second stepped shaft, and the coupling includes a first coupling and a second coupling that are snapped together; the internal cavity surface formed by the first coupling and the second coupling matches the external surface after the first stepped shaft and the second stepped shaft are combined, so that the coupling can be stably mounted on the static balancing tooling.

[0012] In a preferred embodiment, further, an oil channel is provided in the hydraulic bearing for introducing external oil into the gap between the bearing shell and the columnar structure to form a stable liquid oil film to support the rotation of the columnar structure, reduce friction and ensure rotation accuracy.

[0013] In a preferred implementation, further, the interior of the bearing seat is a cavity structure, a bearing shell mounting seat is provided in the cavity structure, and the bearing shell is installed in the bearing shell mounting seat; an oil inlet is provided at the upper part of the bearing seat for introducing lubricating oil from an external oil supply system, and an oil return port is provided at the lower part of the bearing seat for discharging excess lubricating oil.

[0014] In a preferred implementation, further, the bearing bush of the hydraulic bearing includes a bushing and a bearing alloy arranged on an inner ring of the bushing, and the thickness of the bearing alloy is 3-10 mm.

[0015] In a preferred implementation, further, the bearing shell is provided with an oil passage matching the oil inlet and the oil return port, wherein the oil inlet is connected to the oil inlet passage via an oil pipe located inside the bearing seat.

[0016] In a preferred implementation, further, the oil inlet passage is an L-shaped structure, extending axially from one end of the bearing shell to a certain depth and then extending toward its axial center direction to the inner surface of the bearing shell.

[0017] In a preferred implementation, further, the return oil passage has the same structure as the oil inlet passage, the lubricating oil enters the oil inlet passage through the oil inlet port, forms an oil film on the inner surface of the bearing shell, and flows into the bearing seat cavity through the return oil passage, and is then discharged to the return oil port.

[0018] In a preferred implementation, the hydraulic bearing further includes an end cover, a fastening hoop and a rotary seal, the end cover is installed at both ends of the bearing seat, the end cover is provided with a center hole coaxial with the bearing shell, a rotary seal is installed in the center hole, the rotary seal is in contact with the first support shaft and the second support shaft to form a dynamic seal; the fastening hoop fits the end cover and is fixed on the first support shaft and the second support shaft to limit the axial movement of the support shaft.

[0019] In a preferred implementation, it further includes a base, the top surface of the base is connected to the bearing seat, and a gasket is provided between the joint surface of the base and the bearing seat, which is used to adjust the height of the bearing seat to adjust the position height of the coupling installed on the static balancing tooling; a plurality of vertical plates are provided on the base, side plates are provided on the side of the base, and rib plates arranged up and down are provided inside the base.

[0020] The beneficial effects of the utility model are:

[0021] First, the static balancing test bench for marine couplings of this invention supports the static balancing fixture via hydraulic bearings, utilizing oil film lubrication to achieve low-friction, smooth rotation, making static balancing tests of couplings more accurate and stable. Furthermore, the test bench's structural design provides adaptability to different coupling types, thereby enhancing test accuracy and the bench's versatility. The static balancing fixture utilizes a segmented structure, enabling flexible assembly through threaded connections between a first support shaft, multiple stepped shafts, and a second support shaft, enhancing structural stability and modular convenience.

[0022] Second, in the preferred implementation, the precise matching of the stepped shaft and the internal cavity of the coupling and the T-shaped support shaft design of the utility model ensure the coaxiality of the coupling and the static balancing tooling, thereby improving the test accuracy; the stable connection between the coupling and the support shaft further ensures the accuracy and repeatability of the static balancing test.

[0023] Third, in a preferred embodiment, the hydraulic bearing's bushing incorporates a bearing alloy, coupled with an L-shaped oil inlet channel. This effectively distributes lubricating oil between the bushing and the rotating shaft, forming a stable oil film that reduces friction and extends life. Furthermore, the design of the end cap and rotating seal provides a strong seal, preventing lubricating oil leakage and blocking the ingress of external contaminants. This ensures lubrication performance while enhancing system durability and operational stability.

[0024] Fourth, in the preferred implementation, the base of the utility model is designed with an adjustable gasket for flexibly adjusting the height of the bearing seat, thereby ensuring the optimal rotation space of the coupling on the test bench; at the same time, the vertical plates, side plates and rib plates on the base enhance the rigidity of the structure, effectively prevent deformation, and ensure the accuracy of the static balance test and the long-term stability of the test bench. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a partial cross-sectional view of a static balance test bench for a marine coupling according to an embodiment of the present utility model;

[0026] Figure 2 This is a structural cross-sectional view of a hydraulic bearing disposed at the bottom of a static balancing tool according to an embodiment of the present utility model;

[0027] Figure 3 It is a structural cross-sectional view of a bearing shell arranged at the bottom of a static balancing tool according to an embodiment of the present utility model.

[0028] Among them, 1-base; 2-hydraulic bearing; 20-bearing seat; 200-oil inlet; 201-oil return port; 202-oil pipe; 21-bearing shell; 210-block; 2100-oil inlet channel; 211-bearing alloy; 22-end cover; 23-fastening clamp; 3-static balancing tooling; 30-first support shaft; 31-first stepped shaft; 32-second stepped shaft; 33-second support shaft; 4-coupling; 40-first coupling; 41-second coupling. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application will be further described in detail below with reference to the accompanying drawings and embodiments.

[0030] In the description of this application, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. Terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; "connected" can mean a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0031] In the description of this application, it should be understood that the terms "up", "down", "left", "right", "front", "back", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on this application.

[0032] Throughout this specification, terms such as "one embodiment / method," "some embodiments / methods," and "specific embodiments / methods" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments / methods or examples.

[0033] As the instruction manual Figure 1 The utility model describes a static balancing test bench for a marine coupling, comprising a hydraulic bearing 2 and a static balancing fixture 3. The hydraulic bearing 2 comprises a bearing seat 20 and a bearing shell 21 mounted inside the bearing seat 20. The two ends of the static balancing fixture 3 are columnar structures, each of which is clearance-matched with a hydraulic bearing 2. The static balancing fixture 3, as the core component of the test bench, is supported at both ends by clearance-matching with the hydraulic bearing 2 to achieve smooth rotation. An oil channel is provided in the hydraulic bearing 2 for introducing external oil into the gap between the bearing and the columnar structure to form a stable liquid oil film to support the rotation of the columnar structure, reduce friction and ensure rotation accuracy. The coupling 4 is sleeved on the static balancing fixture 3 and is located between the two hydraulic bearings 2 to ensure that the coupling 4 can achieve coaxial rotation with the static balancing fixture 3. The entire bench is tightly connected to the hydraulic bearing and the static balancing fixture, providing a low-friction, high-precision support environment for the static balancing test of the coupling, so that the static balancing performance of the coupling can be effectively evaluated during the test.

[0034] It should be noted that Figure 1 This is a partial cross-sectional view of a static balancing test bench for a marine coupling. The hydraulic bearing 2 shown in the figure only shows the structure located at the bottom of the static balancing tool 3.

[0035] The designed clearance between the hydraulic bearing 2 and the columnar structures at each end of the static balancing fixture 3 is 0.05-0.15mm. The specific clearance value is optimized based on the viscosity of the lubricating oil, the equipment speed, and the load conditions to ensure stable oil film formation and good lubrication. This clearance range ensures sufficient distribution of the lubricating oil during both static and dynamic operation and effectively reduces friction during high-speed rotation. The friction coefficient of the hydraulic bearing 2 during stable operation is 0.001-0.005, which is significantly lower than that of traditional sliding bearings, effectively reducing energy loss. During dynamic operation, the oil film thickness is 5-10μm, ensuring the stability and reliability of the bearing under high load conditions.

[0036] In the implementation of the present application, the static balancing fixture 3 adopts a segmented structure, including a first support shaft 30 and a second support shaft 33 connected to the hydraulic bearing 2, and multiple stepped shafts located between the first support shaft 30 and the second support shaft 33. The first support shaft 30, the multiple stepped shafts, and the second support shaft 33 are provided with interconnected threaded holes and mounting surfaces. The first support shaft 30, the multiple stepped shafts, and the second support shaft 33 are sequentially spliced ​​together to form a complete static balancing fixture 3. The diameter and length of each stepped shaft are adjusted step by step according to the support requirements of different couplings to improve the versatility of the test bench.

[0037] As the instruction manual Figure 1 , there are two of the multiple stepped shafts, namely the first stepped shaft 31 and the second stepped shaft 32. The coupling 4 includes a first coupling 40 and a second coupling 41 that are snapped together. The internal cavity surface formed by the first coupling 40 and the second coupling 41 matches the external surface of the combination of the first stepped shaft 31 and the second stepped shaft 32, so that the coupling 4 can be stably mounted on the static balancing fixture 3, ensuring the coaxiality between the coupling 4 and the static balancing fixture 3 during the test. The various sections of the static balancing fixture 3 are tightly connected to ensure the coaxial accuracy between the shafts to avoid the imbalance caused by component misalignment. This splicing method facilitates the disassembly and maintenance of the fixture, and also improves the flexibility of manufacturing and assembly.

[0038] Furthermore, the first support shaft 30 and the second support shaft 33 are T-shaped structures, the first coupling 40 is connected to the flange on the vertical section of the first support shaft 30 through fasteners, the second coupling 41 is fitted with the transverse section of the T-shaped structure of the second support shaft 33, and the mating surfaces of the first coupling 40 and the second coupling 41 are connected by fasteners.

[0039] During the installation process, first fit the second coupling 41 to the T-shaped transverse section of the second support shaft 33. Next, install the second stepped shaft 32 into the inner cavity of the second coupling 41 and fix one end of it to the second support shaft 33 with bolts. Subsequently, the other end of the second stepped shaft 32 is bolted to the first stepped shaft 31 and the first support shaft 30 in turn to form a continuous coaxial structure. Then, insert the first coupling 40 from one end of the vertical section of the first support shaft 30 and align it with the second coupling 41. Fasten the first coupling 40 and the second coupling 41 with bolts. Finally, install the first support shaft 30 and the second support shaft 33 into the hydraulic bearing 2 respectively to complete the installation of the entire static balancing tooling.

[0040] As the instruction manual Figure 2-3 The hydraulic bearing 2 includes a bearing seat 20 and a bearing shell 21. The interior of the bearing seat 20 is a cavity structure, in which a bearing shell mounting seat is provided, and the bearing shell 21 is mounted in the bearing shell mounting seat. The upper part of the bearing seat 20 is provided with an oil inlet 200 for introducing lubricating oil from an external oil supply system, and the lower part is provided with an oil return port 201 for discharging excess lubricating oil from the bearing shell 21 and the cavity of the bearing seat 20. The bearing shell 21 is provided with an oil channel that matches the oil inlet 200 and the oil return port 201, wherein the oil inlet 200 and the oil inlet channel 2100 are connected by an oil pipe 202 located inside the bearing seat 20, and the oil return channel is directly connected to the inner cavity of the bearing seat 20. The oil inlet channel 2100 is an L-shaped structure, and the oil channel extends axially from one end of the bearing shell 21 to a certain depth, and then extends vertically upward to the inner surface of the bearing shell 21. This design ensures that after the lubricating oil flows in through the oil inlet 200, it can directly enter the contact surface between the bearing and the rotating shaft, forming a stable oil film on the inner ring to reduce friction. The return oil channel has the same structure as the oil inlet channel and is located at the same end of the bearing 21 as the oil inlet channel. The lubricating oil enters the oil inlet channel of the bearing 21 through the oil inlet 200 and forms a uniform oil film on the inner surface of the bearing 21, lubricating the contact surface between the bearing 21 and the static balancing fixture 3. Excess oil flows through the return oil channel to the return oil port 201, thus realizing the circulation of the oil.

[0041] The bearing pad 211 comprises a pad 210 and a bearing alloy 211 positioned within the inner ring of the pad 210. The pad 210's shape precisely matches the pad mounting seat of the bearing housing 20, ensuring its stability within the housing 20. The bearing alloy 211, cast onto the inner ring of the pad 210, enhances the wear resistance and load-bearing capacity of the bearing pad 21. The thickness of the bearing alloy 211 ranges from 3 to 10 mm. This thickness ensures uniform oil film distribution and maintains the durability of the bearing pad 21 under high loads.

[0042] In the implementation of the present application, the shoe 210 is made of high-strength alloy steel, exhibiting excellent rigidity and deformation resistance, ensuring dimensional accuracy under high load conditions. The bearing alloy 211 utilizes a tin- or lead-based alloy, exhibiting excellent wear resistance and thermal conductivity. The bearing alloy has a hardness range of HB 25-35, which, combined with the lubricating oil film, can reduce mechanical wear on the bearing. The bearing seat 20 is made of cast steel, exhibiting excellent mechanical strength and impact resistance, capable of withstanding high radial and axial loads.

[0043] By designing the clearance between the hydraulic bearing 2 and the columnar structures at both ends of the static balancing fixture 3 and selecting the materials of the parts, the hydraulic bearing 2 can achieve high-precision fit with the static balancing fixture 3, ensuring that friction and energy consumption are effectively reduced during the static balancing bench test process, while also improving the overall service life and reliability of the equipment.

[0044] The hydraulic bearing 2 also includes end caps 22, clamping hoops 23, and rotating seals. The end caps 22 are mounted on both ends of the bearing housing 20 to ensure complete sealing and stability of the bearing. The end caps 22 feature a central hole coaxial with the bearing shell 21, ensuring the coaxiality of the rotating shaft and the bearing shell, improving the coaxiality and stability of the system. The rotating seals are installed in the central hole of the end caps 22. The rotary seals contact the first and second support shafts 30 and 33, forming a dynamic seal that prevents lubricant leakage from the bearing and prevents external dust and impurities from entering the bearing cavity. The end caps 22 are secured to the bearing housing with bolts or other fastening devices, forming a closed cavity that protects internal components from external contaminants and supports the installation of the rotating seals and clamping hoops. The rotating seals are made of wear-resistant material to withstand the high-frequency rotation of the rotating shaft, maintaining a stable seal and extending the seal's service life. Each clamping hoops 23 rests against the end caps 22 and is secured to the first and second support shafts 30 and 33 respectively via bolts or locking devices. The design of the tightening hoop can effectively prevent the support shaft from moving in the axial direction, ensuring the axial positioning and stability between the static balancing tooling and the bearing shell.

[0045] In the implementation of the present application, the static balancing test bench for a marine coupling further comprises a base 1. The top surface of each base 1 is connected to a bearing seat 20, forming a solid support base to ensure the stability of the bearing seat during testing. By adding or removing shims between the mating surfaces of the base 1 and the bearing seat 20, the height of the bearing seat 20 can be adjusted, thereby adjusting the position and height of the coupling 4 mounted on the static balancing fixture 3. The shim adjustment mechanism ensures sufficient rotation space for the coupling 4 after installation, avoiding interference caused by height deviation and ensuring smooth and unimpeded rotation of the coupling during testing.

[0046] Base 1 is equipped with multiple vertical plates, which enhance the overall vertical support rigidity of the base and ensure that the base does not tilt or deform under high loads. Side plates are provided on the sides of base 1 to enhance the lateral rigidity of the base and prevent lateral deformation of the base structure during testing. Ribs arranged vertically inside base 1 connect the vertical plates and side plates through the ribs, effectively improving the overall structural rigidity of the base. The rib design provides additional support when carrying heavy objects and ensures that the base does not deform under gravity and operating pressure.

[0047] The working principle of the static balance test bench for marine coupling of this utility model:

[0048] First, install the static balancing fixture on the hydraulic bearing. Ensure the fixture's axis is level by adjusting the base shims and using a spirit level. Gently push the fixture to allow it to rotate freely, and test whether it can remain stationary at any angle to determine whether there is any imbalance. Add a minimum counterweight to the static balancing fixture's maximum outer diameter and observe the dynamic behavior of the counterweight under gravity to determine the magnitude and direction of the imbalance. Based on the measured imbalance, adjust the fixture's mass distribution until the target balance quality level is achieved. Then, install the coupling on the static balancing fixture. The maximum outer diameter of the coupling is divided into equal sections according to the circumference angle. Using these sections, adjust the compensating mass and optimize the mass distribution so that the coupling remains stationary and free of spontaneous rotation at all angles. After these adjustments, verify the balance through multiple tests. Then, add a known minimum counterweight to the maximum outer diameter of the coupling and test its dynamic behavior. Using the formula for calculating the counterweight and imbalance, verify that the coupling meets the static balance requirements and determine its balance quality level.

[0049] It should be noted that the minimum counterweight added to the maximum outer diameter of the coupling is the actual counterweight required for the coupling. The actual counterweight M a =MM ’ , M represents the initial minimum counterweight mass added after the coupling has been tested multiple times to verify its balance state; M ’ Indicates the static balancing fixture unbalance U0 is distributed to the coupling weight outer diameter R a Furthermore, the static balancing fixture unbalance U0 is distributed to the outer diameter R of the coupling counterweight. a Theoretical counterweight mass U0 represents the unbalance amount of the static balancing tool; R a Indicates the outer diameter of the coupling counterweight. The actual counterweight and unbalance calculation formula of the coupling is U a =M a ×R a , U a Indicates the unbalance of the coupling, M a Indicates the actual counterweight required for the coupling; R aIndicates the maximum outer diameter of the coupling. Finally, the unbalanced value U of the coupling is calculated. a , refer to the U standard GB / T 9239.1 a The balance quality level corresponding to the value can determine the balance quality level of the coupling.

[0050] The static balancing test bench for marine couplings of the utility model supports the static balancing fixture through hydraulic bearings to achieve low-friction rotation. It combines the modular splicing structure, precise coaxial design, optimized lubrication and sealing performance, and adjustable base structure of the static balancing fixture to improve accuracy, versatility, and stability.

[0051] The above is only an embodiment of the present invention, and common knowledge such as the specific structure and characteristics of the scheme are not described in detail here. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claim involved.

Claims

1. A static balance test bench for marine coupling, characterized in that: The invention comprises a hydraulic bearing (2) and a static balancing tool (3); the hydraulic bearing (2) comprises a bearing seat (20) and a bearing bush (21) installed inside the bearing seat (20); the two ends of the static balancing tool (3) are columnar structures, and the columnar structures at the two ends are respectively clearance-matched with the bearing bush (21) of a hydraulic bearing (2) to achieve smooth rotation through the support of the hydraulic bearing (2); the static balancing tool (3) adopts a segmented structure, comprising a first support shaft (30) and a second support shaft (33) respectively connected to the hydraulic bearings (2) on both sides, and a plurality of stepped shafts located between the first support shaft (30) and the second support shaft (33); the first support shaft (30), the plurality of stepped shafts and the second support shaft (33) are axially connected in series in sequence; the coupling (4) is sleeved on the static balancing tool (3), and is located between the two hydraulic bearings (2), and rotates coaxially with the static balancing tool (3).

2. The static balance test bench for marine coupling according to claim 1, characterized in that: The stepped shaft comprises an axially connected first stepped shaft (31) and a second stepped shaft (32), and the coupling (4) comprises a first coupling (40) and a second coupling (41) that are snapped together; the internal cavity profile formed by the first coupling (40) and the second coupling (41) matches the external profile of the first stepped shaft (31) and the second stepped shaft (32) after being combined, so that the coupling (4) can be stably mounted on the static balancing tool (3).

3. The static balance test bench for marine coupling according to claim 1, characterized in that: An oil channel is provided in the hydraulic bearing (2) for introducing external oil into the gap between the bearing bush (21) and the columnar structure to form a stable liquid oil film to support the rotation of the columnar structure, reduce friction and ensure rotation accuracy.

4. The static balance test bench for marine coupling according to claim 1, characterized in that: The interior of the bearing seat (20) is a cavity structure, a bearing shell mounting seat is provided in the cavity structure, and the bearing shell (21) is installed in the bearing shell mounting seat; the upper part of the bearing seat (20) is provided with an oil inlet (200) for introducing lubricating oil from an external oil supply system, and the lower part of the bearing seat (20) is provided with an oil return port (201) for discharging excess lubricating oil.

5. The static balance test bench for marine coupling according to claim 4, characterized in that: The bearing bush of the hydraulic bearing comprises a bushing and a bearing alloy arranged on the inner ring of the bushing, and the thickness of the bearing alloy is 3-10 mm.

6. The static balance test bench for marine coupling according to claim 4, characterized in that: The bearing shell (21) is provided with an oil passage matching the oil inlet (200) and the oil return port (201), wherein the oil inlet (200) is connected to the oil inlet passage (2100) via an oil pipe (202) located inside the bearing seat (20).

7. The static balance test bench for marine coupling according to claim 6, characterized in that: The oil inlet passage (2100) is an L-shaped structure, extending axially from one end of the bearing shell (21) to a certain depth and then extending toward the axial center thereof to the inner surface of the bearing shell (21).

8. The static balance test bench for marine coupling according to claim 7, characterized in that: The oil return passage has the same structure as the oil inlet passage. Lubricating oil enters the oil inlet passage (2100) through the oil inlet port (200), forms an oil film on the inner surface of the bearing shell (21), and flows into the cavity of the bearing seat (20) through the oil return passage, and is then discharged to the oil return port (201).

9. The static balance test bench for marine coupling according to claim 2, characterized in that: The hydraulic bearing (2) includes an end cover (22), a fastening hoop (23) and a rotary seal. The end cover (22) is installed at both ends of the bearing seat (20). The end cover (22) is provided with a center hole coaxial with the bearing shell (21). A rotary seal is installed in the center hole. The rotary seal contacts the first support shaft (30) and the second support shaft (33) to form a dynamic seal. The fastening hoop (23) fits the end cover (22) and is fixed on the first support shaft (30) and the second support shaft (33) to limit the axial movement of the support shaft.

10. The static balance test bench for marine coupling according to claim 1, characterized in that: The utility model further comprises a base (1), the top surface of the base (1) being connected to the bearing seat (20), a gasket being provided between the joint surfaces of the base (1) and the bearing seat (20) for adjusting the height of the bearing seat (20) so as to adjust the position height of the coupling (4) installed on the static balancing tool (3); a plurality of vertical plates being provided on the base (1), side plates being provided on the sides of the base (1), and rib plates being arranged up and down inside the base (1).

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