High-precision static balancing test bench and method for shafting transmission equipment

Abstract

The application belongs to the technical field of shafting coupling, and particularly relates to a high-precision static balance test bench and method for shafting transmission equipment, the test bench comprising a hydraulic bearing and a static balance tool, wherein the hydraulic bearing is composed of a bearing seat and a bearing bush installed in the bearing seat; the static balance tool has a columnar structure at both ends and is matched with the bearing bush gap of the hydraulic bearing, and is supported by the hydraulic bearing to realize stable rotation; the hydraulic bearing is provided with an oil channel to introduce external oil into the gap between the bearing bush and the columnar structure to form a stable liquid oil film to support rotation, reduce friction and ensure precision; the static balance tool has a sectional structure and is composed of a first supporting shaft, multiple stepped shafts and a second supporting shaft connected in sequence in the axial direction, and a coupling is sleeved on the static balance tool and rotates coaxially with the static balance tool and is located between the hydraulic bearings. The application solves the problems of insufficient test precision, poor structural adaptability and low stability of the existing test bench, and significantly improves the detection precision, structural adaptability and vibration resistance.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of shafting coupling of a ship, in particular, relates to a high-precision static balance test bench and method for shafting transmission equipment. BACKGROUND

[0002] In a ship transmission system, a coupling is a crucial connecting component, and its main functions include transmitting torque, absorbing vibration, and buffering impact, thereby ensuring efficient transmission of power between the engine and the transmission shafting. The coupling can effectively alleviate the impact caused by uneven engine operation or load fluctuations, reduce internal vibration and noise of the system, and plays a key role in the smoothness and durability of the transmission system. Usually, the coupling connects the output shaft of the power source at one end and the input shaft of the bearing at the other end, and realizes smooth transmission of torque through flexible connection, while bearing axial and radial loads to ensure stable operation of the transmission system.

[0003] In order to ensure the stability and reliability of the coupling, it needs to be tested for static balance. The goal of static balance testing is to ensure the smoothness and efficiency of the coupling under actual operating conditions by analyzing its mass distribution, unbalanced torque, eccentricity and vibration characteristics. Currently, static balance testing usually relies on static balance test benches to complete, such devices mainly consist of test bases, support components and limiting devices, etc. The coupling is installed in the pillow block or clamp on the base, fixed by a dummy shaft and a support plate, and allows the component to rotate freely at various angles. The test process adjusts the counterweight until the system reaches static balance, and finally realizes the balance quality of the coupling.

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

[0005] 1. Insufficient test precision: As a high-precision transmission component, the coupling needs to be tested for precise static balance. The balance quality level is an important indicator to measure the balance of rotating parts. According to the standard GB / T 9239.1, the balance quality level includes G6.3, G2.5 and G1.0 or higher, among which G6.3 is suitable for general industrial equipment such as ordinary motors, pumps and general machinery, which belongs to medium balance quality. G2.5 is suitable for equipment with high balance requirements such as compressors and machine tool driving devices, which belongs to high balance quality. G1.0 or higher is suitable for ultra-high precision equipment such as image equipment and grinding machine driving devices, which requires extremely high balance precision. The test precision of the current test bench can only meet the G6.3 level, which is difficult to meet the high precision requirement of the static balance test of the coupling (such as G2.5 or G1.0), so as to detect the small mass deviation and unbalanced torque, affecting the reliability of the test result. Since each coupling needs to be adjusted according to the test result, the insufficient precision of the test bench may lead to improper weight adjustment, affecting the actual application performance of the coupling and reducing the stability and durability of the system.

[0006] 2. Insufficient structural adaptability: The existing static balance test bench usually adopts clamping tooling, and the design of clamping tooling is mainly aimed at simple structure and regular shape of coupling, without fully considering the complexity and diversity of marine coupling structure, and the shape, weight and internal geometric characteristics of different marine couplings are significantly different. The clamping tooling only contacts the two ends of the coupling, which may cause clamping instability or introduce additional eccentricity. The coupling usually contains multiple components, which may further cause eccentricity or uneven mass. The tooling design is universal, and different support and clamp configurations are needed for large and small couplings, but the existing equipment lacks modular components for quick replacement, resulting in long preparation time and low efficiency before testing.

[0007] 3. Insufficient structural stability: The test base of the existing static balance test bench includes circular pillow blocks, and the straight cylindrical dummy shaft is arranged inside the coupling. The two ends of the dummy shaft are placed in the circular groove of the two pillow blocks. This support form has small contact area, and the dummy shaft is easy to slide or deviate due to uneven mass distribution or self-weight of the coupling, affecting the positioning accuracy. At the same time, the friction force between the dummy shaft and the surface of the pillow block may change during rotation, which may cause unstable rotation, especially at low speed, which has a significant impact on the stability of the test result. In addition, the coupling has large volume and high weight, and the support structure is easy to resonate or deform during frequent or long-time testing, further causing distortion of test data and failing to meet the stability requirement under high load condition.

[0008] Therefore, there is an urgent need for a static balance testing device that can ensure high testing accuracy while improving the adaptability to the diversified structure of the shaft coupling and the stability of the testing process to meet the requirements of modern ship systems for the efficiency and reliability of the shaft coupling. SUMMARY

[0009] The present application aims at the defects of the prior art and provides a high-precision static balance test bench and method for shaft transmission equipment, which has high-precision detection, good structural adaptability and vibration resistance and can meet the requirements of modern ships for balance testing of shaft couplings.

[0010] In one aspect, the present application provides a high-precision static balance test bench for shaft transmission equipment, comprising a hydraulic bearing and a static balance tool; the hydraulic bearing comprises a bearing seat and a bearing bush installed inside the bearing seat; the static balance tool has a columnar structure at both ends, and the columnar structures at both ends are respectively matched with the bearing bushes of one hydraulic bearing in clearance to be supported by the hydraulic bearing for stable rotation;

[0011] The hydraulic bearing is provided with an oil channel for introducing external oil into the clearance between the bearing bush 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 static balance tool has a segmented structure, comprising a first support shaft and a second support shaft connected with the hydraulic bearings on both sides respectively, and a plurality of stepped shafts 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 sequentially connected together in the axial direction; a shaft coupling is sleeved on the static balance tool and located between the two hydraulic bearings, and rotates coaxially with the static balance tool.

[0012] In a preferred implementation, further, the stepped shaft comprises a first stepped shaft and a second stepped shaft connected in the axial direction, and the shaft coupling comprises a first shaft coupling and a second shaft coupling that are buckled together; the internal cavity profile formed by the first shaft coupling and the second shaft coupling matches the external profile of the combination of the first stepped shaft and the second stepped shaft, so that the shaft coupling can be stably sleeved on the static balance tool.

[0013] In a preferred implementation, further, the bearing seat is internally hollow, and the hollow structure is provided with a bearing bush mounting seat, and the bearing bush is mounted in the bearing bush mounting seat; the upper part of the bearing seat is provided with an oil inlet for introducing lubricating oil from an external oil supply system, and the lower part of the bearing seat is provided with an oil return port for discharging excess lubricating oil;

[0014] The bushing of the hydraulic bearing comprises a bush and a bearing alloy arranged in the inner ring of the bush, and the thickness of the bearing alloy is 3-10 mm; the bush is provided with an oil channel matched with the oil inlet and the oil return outlet, wherein the oil inlet is connected with the oil inlet channel through an oil pipe arranged inside the bearing seat; the oil inlet channel has an L-shaped structure, extends to a certain depth along the axial direction from one end of the bush, and then extends to the inner surface of the bush along the axial direction; the oil return channel has the same structure as the oil inlet channel, lubricating oil enters the oil inlet channel through the oil inlet, forms an oil film on the inner surface of the bush, and then flows into the cavity of the bearing seat through the oil return channel, and is then discharged to the oil return outlet.

[0015] In the preferred implementation, further, the hydraulic bearing further comprises an end cover, a fastening clamp and a rotary seal, the end cover is installed at both ends of the bearing seat, the end cover is provided with a central hole coaxial with the bush, a rotary seal is installed in the central hole, the rotary seal is in contact with the first support shaft and the second support shaft to form a dynamic seal, and the fastening clamp is attached to the end cover and fixed on the first support shaft and the second support shaft to limit the axial movement of the support shaft.

[0016] In another aspect, the application also provides a method for high-precision static balancing test of the shafting transmission device, the method comprising:

[0017] Step 1: install the hydraulic bearing and the static balancing tool, adjust the test bench, and calibrate the static balancing tool horizontally;

[0018] Step 2: slightly push the static balancing tool to rotate it in the clockwise and counterclockwise directions respectively, and observe whether it can be stationary at any position to preliminarily detect the free balance state of the static balancing tool;

[0019] Step 3: add a minimum counterweight at an arbitrary position at the maximum outer diameter of the static balancing tool 3 to guide the gravity center of the unbalance to shift, observe whether the counterweight rotates to the lowest point to be stationary or slightly swings within a predetermined angle range at the theoretical lowest point, determine the balance quality level of the static balancing tool according to the unbalance calculation formula, and verify the determination result through multiple tests, when the static balancing tool reaches the balance quality level required by the high elastic coupling static balancing test, execute Step 4; otherwise, calibrate the static balancing tool and execute Step 4;

[0020] Step 4: Install the coupling onto the static balancing fixture and mark the lowest point of the coupling. Divide the outer ring of the coupling into 8 to 12 equal sections. At the double-ended stud positions on the outer ring of the coupling, adjust the compensation mass by adding balance blocks or adjusting the position of the bolts, and mark the adjustment positions. At the marked double-ended stud positions, gradually replace the initial compensation mass with flat shims of equal weight to ensure the stability and long-term reliability of the adjustment. Repeat the adjustment and testing until the coupling remains stationary at each of the equal division points on the test bench without spontaneous rotation, thus completing the static balancing adjustment.

[0021] Step 5: At the maximum outer diameter R of the high-elasticity coupling a Set a minimum counterweight M of known mass. a By observing the counterweight M a The dynamic behavior under gravity is used to determine whether it rotates to the lowest point and stops or oscillates slightly within a predetermined range of the theoretical lowest point. The test results are verified through multiple tests. If the counterweight performance meets the above conditions, the static balance test of the high-elasticity coupling is deemed qualified. The unbalance is calculated based on the counterweight mass of the high-elasticity coupling to determine the balance quality level of the coupling.

[0022] In a preferred implementation, step 3 further includes:

[0023] Step 3.1: Add a counterweight M0 of known mass at any position of the maximum outer diameter R0 of the static balancing fixture. The mass of the counterweight M0 should meet the test accuracy requirements and be the smaller value.

[0024] Step 3.2: After adding the counterweight, gently push the static balancing fixture to allow it to rotate freely, observe the dynamic behavior of the counterweight under the action of gravity, and determine whether the counterweight M0 has rotated to the lowest point and stopped or oscillated slightly within ±15° of the theoretical lowest point.

[0025] Step 3.3: Calculate the unbalance U0 of the static balancing fixture and determine whether its balance quality meets the G1 level. If it does, proceed to the next test step; if it does not, adjust the installation and coaxiality of the static balancing fixture, correct the horizontal state of the test bench, and optimize the weight distribution to reduce the unbalance.

[0026] In a preferred implementation, step 4 further includes:

[0027] Step 4.1: Install the coupling onto the calibrated static balancing fixture, ensuring that the axes of the coupling and the static balancing fixture are coaxially aligned. Check that the connecting parts of the coupling and the static balancing fixture are secure and confirm that they can rotate freely on the hydraulic bearing.

[0028] Step 4.2: Keep the coupling stationary and, by observing its natural position under the influence of gravity, make a starting mark at the lowest point of the coupling as the reference point for adjustment;

[0029] Step 4.3: Based on the structure of the outer ring of the coupling, divide the outer ring into 8 to 12 equal areas, and mark each area with equal intervals as adjustment reference points;

[0030] Step 4.4: Install double-ended studs in the threaded holes of the equally divided areas of the outer ring of the coupling, and adjust the size and position of the compensating mass at the selected double-ended stud positions by adding balance blocks or adjusting the position of the bolts to compensate for the offset of the center of gravity of the coupling.

[0031] Step 4.5: After adjusting the compensation quality, gently push the coupling to observe its dynamic behavior, judge the adjustment effect, record the position of the double-ended stud that was adjusted, and gradually optimize the compensation quality.

[0032] Step 4.6: At the marked double-ended stud position, replace the initial compensation mass balance block with a flat shim of equal weight. Verify its dynamic behavior on the test bench by rotating the coupling multiple times. Fine-tune the flat shim or add additional compensation mass until the coupling remains stationary and does not rotate spontaneously at all equal division points. Record the final adjustment results, including the position and weight of the compensation mass.

[0033] In a preferred implementation, further, in step 4.3, the coupling is divided into 8 to 12 equal regions, with each region having an angular interval of 30° to 45°.

[0034] In a preferred implementation, step 5 further includes:

[0035] Step 5.1: Calculate the imbalance U0 of the static balancing fixture and distribute it to the outer diameter R of the coupling. a The theoretical counterweight mass is used to calculate the actual required counterweight mass M of the coupling. a At the maximum outer diameter R of the coupling a Select an initial weight point at any location and add a counterweight;

[0036] Step 5.2: Gently push the coupling to allow it to rotate freely, and observe the actual counterweight M. a Dynamic behavior under gravity, determining the actual counterweight M a Whether it rotates to the lowest point and comes to a standstill, or whether it oscillates slightly within ±15° of the theoretical lowest point;

[0037] Step 5.3: Under the same counterweight M a Under the given conditions, repeat the free rotation test to verify the consistency of the counterweight's behavior. If the counterweight M... aIf the dynamic behavior of multiple tests is rotated to the lowest point of static balance or slightly swings within the range of ±15° of the theoretical lowest point, it is determined that the static balance state of the coupling is qualified; if the weight M a If the dynamic behavior does not meet the determination standard, adjust the mass distribution of the coupling until the balance quality level requirement is met.

[0038] In the preferred implementation, further, in step 5.1, the unbalance amount U0 of the static balance tool is distributed to the theoretical weight mass on the outer diameter R a of the coupling weight, which is determined by the following formula:

[0039]

[0040] In the formula, U0 represents the unbalance amount of the static balance tool; R a represents the outer diameter of the coupling weight;

[0041] The actual weight mass M a of the coupling is used to eliminate the unbalance amount U0 and achieve an accurate static balance state. It is determined by the following formula:

[0042] M a = M - M'

[0043] In the formula, M represents the minimum weight mass initially added; M' represents the weight mass distributed to the outer diameter R a of the coupling weight by the unbalance amount U0 of the static balance tool;

[0044] In step 5.3, the unbalance amount U a of the coupling is determined by the following formula:

[0045] U a = M a × R a

[0046] In the formula, M a represents the actual weight required by the coupling; R a represents the maximum outer diameter of the coupling

[0047] The beneficial effects of the present application are:

[0048] First, the shafting transmission equipment high-precision static balance test bench of the present application supports the static balance tool through hydraulic bearings, and realizes low friction and stable rotation through oil film lubrication, so that the static balance test of the coupling is more accurate and stable. At the same time, the structural design of the test bench provides adaptability to different types of couplings, thereby improving the accuracy of the test and the versatility of the test bench. The static balance tool adopts a segmented structure, which is flexibly spliced through the threaded connection of the first support shaft, multiple stepped shafts and the second support shaft, thereby enhancing the stability and modular convenience of the structure.

[0049] Secondly, in the preferred implementation, the precise matching of the stepped shaft of the application with the internal cavity of the coupling and the design of the T-shaped support shaft ensure the coaxiality of the coupling and the static balance tool, improving the test accuracy; the stable connection of the coupling and the support shaft further ensures the accuracy and repeatability of the static balance test.

[0050] Thirdly, in the preferred implementation, the bearing shell of the hydraulic bearing of the application adopts a structure with bearing alloy inside, which cooperates with the L-shaped oil inlet channel design to enable the lubricating oil to be effectively distributed between the bearing shell and the rotating shaft, forming a stable oil film to reduce friction and prolong the service life. At the same time, the design of the end cover and the rotating seal provides good sealing effect, preventing lubricating oil leakage and blocking external contaminants from entering, thereby ensuring lubrication performance while improving system durability and operational stability.

[0051] Fourthly, in the preferred implementation, the base of the application is designed with adjustable shims for flexible adjustment of 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 plate, side plate and rib plate on the base enhance the rigidity of the structure, effectively preventing deformation and ensuring the accuracy of the static balance test and the long-term stability of the test bench.

[0052] Fifthly, the method of the high-precision static balance test bench for shafting transmission equipment of the application ensures the balance state of the static balance tool and the coupling through precise installation, calibration and step-by-step test process, realizes high-precision unbalance detection and quality adjustment. Through phased counterweight adjustment and unbalance calculation, the balance quality level of the coupling is further determined to ensure the reliability and repeatability of the test results, thereby providing scientific and accurate evaluation of the static balance performance of the coupling. BRIEF DESCRIPTION OF DRAWINGS

[0053] Figure 1 is a partial sectional view of the high-precision static balance test bench for shafting transmission equipment of an embodiment of the application;

[0054] Figure 2 is a structural sectional view of the hydraulic bearing provided at the bottom of the static balance tool of an embodiment of the application;

[0055] Figure 3 is a structural sectional view of the bearing shell provided at the bottom of the static balance tool of an embodiment of the application;

[0056] Figure 4 is a flowchart of the method of the high-precision static balance test bench for shafting transmission equipment of an embodiment of the application.

[0057] Wherein, 1-base; 2-hydraulic bearing; 20-bearing seat; 200-oil inlet; 201-oil return; 202-oil pipe; 21-bearing bush; 210-bush block; 2100-oil inlet channel; 211-bearing alloy; 22-end cover; 23-fastening hoop; 3-static balance tool; 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

[0058] In order to make the technical personnel in the art better understand the technical solutions of the present application, the following will be further described in detail in combination with the drawings and examples.

[0059] In the description of the present application, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance; the term "multiple" refers to two or more than two, unless otherwise explicitly limited. The terms "mounting", "connection", "connection", "fixing" and the like should be broadly understood, for example, "connection" can be fixed connection, or detachable connection, or integrally connected; "connected" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0060] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of describing the present application and simplifying the description, and do not indicate or imply that the devices or units referred to must have a particular direction, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0061] In the description of the present application, the description of the terms "one embodiment / way", "some embodiments / ways", "specific embodiments / ways" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiments / ways or examples are included in at least one embodiment / way or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment / way or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments / ways or examples in a suitable manner.

[0062] As shown in the description of the drawings Figure 1The application discloses a high-precision static balance test bench for shaft transmission equipment, which comprises a hydraulic bearing 2 and a static balance tool 3. The hydraulic bearing 2 comprises a bearing seat 20 and a bearing bush 21 installed in the bearing seat 20. The static balance tool 3 has a columnar structure at both ends, and the columnar structures at both ends are in clearance fit with one hydraulic bearing 2 respectively. The static balance tool 3 is the core component of the test bench, and is supported by the clearance fit with the hydraulic bearing 2 to realize stable rotation. The hydraulic bearing 2 is provided with an oil channel for introducing external oil into the clearance 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 the rotation accuracy. A coupling 4 is sleeved on the static balance tool 3 and located between the two hydraulic bearings 2 to ensure that the coupling 4 can rotate coaxially with the static balance tool 3. The whole test bench is closely connected by the hydraulic bearing and the static balance tool, and provides a low-friction and high-precision support environment for the static balance test of the coupling, so that the static balance performance of the coupling can be effectively evaluated in the test process.

[0063] It should be noted that, Figure 1 Figure 2 is a partial sectional view of the high-precision static balance test bench for shaft transmission equipment, and the hydraulic bearing 2 shown in the figure only shows the structure at the bottom of the static balance tool 3.

[0064] In the implementation manner of the application, the static balance tool 3 adopts a segmented structure and comprises a first supporting shaft 30 and a second supporting shaft 33 connected with the hydraulic bearing 2 and a plurality of stepped shafts located between the first supporting shaft 30 and the second supporting shaft 33. The first supporting shaft 30, the plurality of stepped shafts and the second supporting shaft 33 are provided with thread holes and mounting surfaces connected with each other, and the first supporting shaft 30, the plurality of stepped shafts and the second supporting shaft 33 are sequentially spliced together to form the complete static balance tool 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 universality of the test bench.

[0065] As shown in the description accompanying drawings Figure 1 The plurality of stepped shafts are two, namely a first stepped shaft 31 and a second stepped shaft 32. The coupling 4 comprises a first coupling 40 and a second coupling 41 which are buckled together. The internal cavity profile formed by the first coupling 40 and the second coupling 41 matches the external profile of the combination of the first stepped shaft 31 and the second stepped shaft 32, so that the coupling 4 can be stably sleeved on the static balance tool 3 and the coaxiality between the coupling 4 and the static balance tool 3 during the test is ensured. The segments of the static balance tool 3 are in close connection to ensure the coaxial accuracy between the shafts and avoid the imbalance caused by the misplacement of components. This splicing manner facilitates the disassembly and maintenance of the tool and improves the flexibility of manufacturing and assembly.

[0066] Further, the first support shaft 30 and the second support shaft 33 are T-shaped structures, the first coupling 40 is connected to the flange plate on the vertical segment of the first support shaft 30 through fasteners, and the second coupling 41 is attached to the horizontal segment of the T-shaped structure of the second support shaft 33, and the combination surface of the first coupling 40 and the second coupling 41 is connected through fasteners.

[0067] During the installation process, first, the second coupling 41 is attached to the T-shaped horizontal segment of the second support shaft 33. Then, the second stepped shaft 32 is installed into the inner cavity of the second coupling 41, and one end of the second stepped shaft 32 is fixed to the second support shaft 33 through bolts. Subsequently, the other end of the second stepped shaft 32 is connected to the first stepped shaft 31 and the first support shaft 30 through bolts in sequence, forming a continuous coaxial structure. Then, the first coupling 40 is sleeved from one end of the vertical segment of the first support shaft 30, and is aligned with the second coupling 41, and the first coupling 40 is fastened and fixed to the second coupling 41 through bolts. Finally, the first support shaft 30 and the second support shaft 33 are respectively installed into the hydraulic bearing 2, and the installation of the entire static balancing tool is completed.

[0068] In the implementation of the present application, as shown in the description and the drawings Figures 2-3 The hydraulic bearing 2 includes a bearing seat 20 and a bearing bush 21. The bearing seat 20 is internally hollow, and the hollow structure is provided with a bearing bush mounting seat, the bearing bush 21 is mounted in the bearing bush 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 in the bearing bush 21 and the cavity of the bearing seat 20. The bearing bush 21 is provided with an oil channel matched with the oil inlet 200 and the oil return port 201, wherein the oil inlet 200 and the oil inlet oil channel 2100 are connected through an oil pipe 202 located inside the bearing seat 20, and the oil return oil channel is directly communicated with the inner cavity of the bearing seat 20. The oil inlet oil channel 2100 is L-shaped, and the oil channel extends axially from one end of the bearing bush 21 to a certain depth, then vertically upward to the inner surface of the bearing bush 21. This design ensures that the lubricating oil flowing from the oil inlet 200 can directly enter the contact surface between the bearing bush and the rotating shaft, forming a stable oil film in the inner ring to reduce friction. The oil return oil channel has the same structure as the oil inlet oil channel and is arranged at the same end of the bearing bush 21 as the oil inlet oil channel. The lubricating oil enters the oil inlet oil channel of the bearing bush 21 through the oil inlet 200, and forms a uniform oil film on the inner surface of the bearing bush 21, lubricating the contact surface between the bearing bush 21 and the static balancing tool 3, and the excess oil flows to the oil return port 201 through the oil return oil channel, thereby realizing the circulation of the oil.

[0069] The bearing shell 21 includes a pad 210 and a bearing alloy 211 arranged in the inner circle of the pad 210. The outer shape of the pad 210 is accurately fitted with the bearing shell mounting seat of the bearing seat 20, which ensures the stability of the bearing shell in the bearing seat 20. The bearing alloy 211 is cast on the inner circle surface of the pad 210 to improve the wear resistance and load capacity of the bearing shell 21. The thickness of the bearing alloy 211 is 3-10 mm, and the thickness of the bearing alloy layer is reasonably designed to uniformly distribute the oil film and maintain the durability of the bearing shell 21 under high load.

[0070] In the implementation of the present application, the hydraulic bearing 2 further includes an end cover 22, a fastening clamp 23 and a rotary seal. The end cover 22 is installed at both ends of the bearing seat 20 to ensure the overall sealing and stability of the bearing. The end cover 22 is provided with a central hole coaxial with the bearing shell 21, which ensures the coaxiality of the rotating shaft and the bearing shell, and improves the coaxiality and stability of the system. The rotary seal is installed in the central hole of the end cover 22, and the rotary seal is in contact with the first support shaft 30 and the second support shaft 33 to form a dynamic seal, which prevents the leakage of lubricating oil from the inside of the bearing and prevents external dust or impurities from entering the bearing cavity. The end cover 22 is fixed with the bearing seat by bolts or other fastening devices to form a closed cavity to protect the internal components from external contaminants, while supporting the installation of the rotary seal and the fastening clamp. The rotary seal is made of wear-resistant material and can withstand high-frequency rotation of the rotating shaft, maintaining stable sealing effect and prolonging the service life of the seal. Each fastening clamp 23 is tightly attached to the end cover 22 and is fixed on the first support shaft 30 and the second support shaft 33 by bolts or locking devices. The design of the fastening clamp can effectively prevent the axial movement of the support shaft, ensuring the axial positioning and stability between the static balance tooling and the bearing shell.

[0071] In the implementation of the present application, the shafting transmission equipment high-precision static balance test bench further includes a base 1. The top surface of each base 1 is connected with the bearing seat 20 to form a solid support foundation to ensure the stability of the bearing seat during the test. Between the combined surface of the base 1 and the bearing seat 20, the height of the bearing seat 20 can be adjusted by adding or removing shims, and then the position height of the coupling 4 installed on the static balance tooling 3 is adjusted. The shim adjustment mechanism ensures the rotation space of the coupling 4 after installation, avoids interference caused by height deviation, and ensures smooth and unobstructed rotation of the coupling during the test.

[0072] The base 1 is provided with a plurality of vertical plates, which improve the overall vertical support rigidity of the base and ensure that the base does not tilt or deform under high load. Side plates are arranged on the side of the base 1 to enhance the lateral rigidity of the base and prevent lateral deformation of the base structure during the test. The inside of the base 1 is provided with upper and lower arranged rib plates, which connect the vertical plates and the side plates, effectively improving the overall structural rigidity of the base. The design of the rib plate provides additional support force when carrying heavy objects and ensures that the base does not deform under gravity and operating pressure.

[0073] The application also discloses a method for high-precision static balance test bench of shaft system transmission equipment, which comprises the following steps:

[0074] Step 1: install the hydraulic bearing and the static balance tool, adjust the test bench, and calibrate the horizontal state of the static balance tool.

[0075] The purpose of step 1 is to ensure the installation height and position accuracy of the hydraulic bearing and the static balance tool. By adjusting the test bench and using the level to calibrate, the axis of the static balance tool is parallel to the ground, which ensures its free rotation ability in the test and provides mechanical stability and accuracy for the subsequent static balance test.

[0076] Step 1 specifically comprises the following steps:

[0077] Step 1.1: place adjusting shims between the joint surface of the base and the bearing seat, select appropriate shim thickness to meet the height requirement of the coupling and the static balance tool, and fix the bearing seat on the base.

[0078] Step 1.2: sequentially splice the components of the static balance tool, including connecting the first support shaft with the first stepped shaft, the first stepped shaft with the second stepped shaft, and the second stepped shaft with the second support shaft, to form a continuous coaxial structure.

[0079] Step 1.3: install the assembled static balance tool at both ends of the hydraulic bearing, and place a level on the upper surface of the hydraulic bearing respectively to detect the horizontal state of the static balance tool.

[0080] Step 1.4: according to the reading of the level, adjust the thickness of the shims between the base and the hydraulic bearing until the bubble of the level is centered, so as to ensure that the axis of the static balance tool is completely horizontal.

[0081] Step 2: gently push the static balance tool to rotate it in clockwise and counterclockwise directions respectively, and observe whether it can be stationary at any position to preliminarily detect the free balance state of the static balance tool.

[0082] The purpose of step 2 is to preliminarily detect the free balance state of the static balance tooling by slightly pushing the static balance tooling to freely rotate in clockwise and counterclockwise directions respectively, and quickly determine whether the static balance tooling has an unbalance amount. If an unbalance is found, the direction and degree thereof are determined to provide a basis for the optimization and quantitative analysis in the next step.

[0083] Step 2 specifically includes:

[0084] Step 2.1: Fill the hydraulic oil in the bearing shell center hole of the hydraulic bearing 2 to make the static balance tooling 3 float, rotate the static balance tooling 3 in the clockwise direction by applying force, stop after rotating to a certain angle, and detect whether the static balance tooling 3 is stationary at any position.

[0085] Step 2.2: Rotate the static balance tooling 3 in the counterclockwise direction by applying force, stop after rotating to a certain angle, and detect whether the static balance tooling 3 is stationary at any position.

[0086] Step 2.3: If the static balance tooling 3 always returns to a fixed position after stopping, it is determined that it has an unbalance state, and step 3 is executed; if the static balance tooling 3 can be stationary at any angle, it is determined that it is in a free balance state, and step 4 is directly executed, and the tests of step 2.1 and step 2.2 are repeated multiple times to verify the stability and reliability of the test results.

[0087] Step 3: Add a minimum counterweight at any position of the maximum outer diameter of the static balance tooling 3 to guide the center of gravity of the unbalance amount to shift, observe whether the counterweight rotates to the lowest point and is stationary under the action of gravity, or slightly swings within a predetermined angle range of the theoretical lowest point, determine the balance quality level of the static balance tooling according to the unbalance amount calculation formula, and verify the determination result through multiple tests, when the static balance tooling reaches the balance quality level required by the high-elasticity coupling static balance test, step 4 is executed; otherwise, the static balance tooling is calibrated and step 4 is executed.

[0088] The purpose of step 3 is to evaluate the unbalance amount of the static balance tooling by adding a minimum counterweight, determine whether it meets the target balance quality level G1, and optimize and adjust according to the result to ensure that it meets the high-precision static balance requirement.

[0089] Step 3 includes:

[0090] Step 3.1: Add a counterweight M0 of a known mass at any position of the maximum outer diameter R0 of the static balance tooling, the mass of the counterweight M0 meets the test accuracy requirement, and is taken as a smaller value.

[0091] The smaller value is, for example, 10g or less, so as to facilitate step-by-step adjustment.

[0092] Step 3.2: After adding the counterweight, by gently pushing the static balance tool, it is free to rotate, and the dynamic behavior of the counterweight under the action of gravity is observed to determine whether the counterweight M0 rotates to the lowest point and is stationary or slightly swings within ±15° of the theoretical lowest point.

[0093] Step 3.3: Calculate the unbalance amount U0 of the static balance tool to determine whether its balance quality meets the G1 level, if it meets, then execute the next test step; if it does not meet, adjust the installation and coaxiality of the static balance tool, correct the level of the test bench, and optimize the counterweight distribution to reduce the unbalance amount.

[0094] It should be noted that according to GB / T 9239.1 to determine whether the balance quality meets the G1 level, the standard GB / T9239.1, the unbalance amount and the target balance quality level are shown in Table 1:

[0095] Balance quality level (G) Allowable unbalance (g-mm / kg) Typical application scenarios G0.4 0.4 High-precision gyroscopes G1 1 Image devices, grinding machine drives G2.5 2.5 Compressors, machine tool drives G6.3 6.3 General electric machines, pumps, general machinery

[0096] The unbalance amount of the static balance tool is determined by the following formula:

[0097] U0 = R0 x M0 (1)

[0098] In the formula, U0 represents the unbalance amount of the static balance tool (unit: g·mm or kg·m); R0 represents the maximum outer diameter of the static balance tool 3 (unit: mm or m); M0 represents the minimum counterweight (unit: g or kg).

[0099] Step 4: Install the coupling to the static balance tool, and mark the starting point at the lowest point of the coupling, divide the coupling outer ring into 8 to 12 equal areas, at the stud position of the coupling outer ring, add balance blocks or adjust the position of the stud to increase or decrease the compensation mass for mass adjustment, and mark the adjustment position, at the marked stud position, gradually replace the initial compensation mass with equal weight flat washers to ensure the stability and long-term reliability of the adjustment, repeat the adjustment and testing until the coupling remains stationary without spontaneous rotation at each division point on the test bench, and complete the static balance adjustment.

[0100] The purpose of Step 4 is to achieve static balance of the coupling by adjusting the mass distribution of the high-elastic coupling outer ring. This stage focuses on preliminary adjustment and optimization of mass compensation, including adding or reducing compensation mass, and verifying the adjustment effect through dynamic observation, gradually replacing the temporary compensation mass with flat washers to ensure long-term stability.

[0101] Step 4 includes:

[0102] Step 4.1: Install the coupling to the completed calibration static balancing tool, make sure the coupling is coaxial with the axis of the static balancing tool, check whether the connecting parts of the coupling and the static balancing tool are fastened, and confirm that it can rotate freely on the hydraulic bearing.

[0103] Step 4.2: Make the coupling stationary, make a starting mark at the lowest point of the coupling as the reference point for adjustment by observing the natural position under the action of gravity.

[0104] Step 4.3: According to the structure of the coupling outer ring, divide the outer ring into 8 to 12 equal areas, and mark each area as an adjustment reference point at equal intervals.

[0105] Specifically, the equal division of the coupling is 8 to 12, and the angle interval of each area is 30° to 45°.

[0106] Step 4.4: Install the stud in the screw hole of the equal division area of the coupling outer ring, and adjust the size and position of the compensation mass by adding balance blocks or adjusting the position of the stud at the selected stud position to compensate for the offset of the center of gravity of the coupling.

[0107] Step 4.5: After adjusting the compensation mass, push the coupling gently to observe its dynamic behavior, judge the adjustment effect, record the position of the stud adjusted, and gradually optimize the compensation mass.

[0108] Step 4.6: Replace the initial compensation mass balance block with an equal weight flat washer at the marked stud position, verify the dynamic behavior of the coupling on the test bench by rotating it several times, fine-tune the flat washer or add additional compensation mass until the coupling remains stationary and does not rotate spontaneously at all division points, and record the final adjustment results, including the position and weight of the compensation mass.

[0109] It should be noted that the purpose of replacing the initial test weight (such as balance block) with flat washer is to directly participate in the assembly of the coupling after replacing the weight with flat washer as a fixed mass to compensate for the unbalance, and balance the mass distribution of the coupling. In step 4.6, the final compensation mass recorded by the coupling is the minimum weight of the initial added mass, which is used to test and adjust the balance state of the coupling.

[0110] Step 5: At the maximum outer diameter R a of the high elastic coupling, set a minimum weight M a of a known mass, and observe the weight M aThe dynamic behavior under gravity is used to determine whether it rotates to the lowest point and stops or oscillates slightly within a predetermined range of the theoretical lowest point. The test results are verified through multiple tests. If the counterweight performance meets the above conditions, the static balance test of the high-elasticity coupling is deemed qualified. The unbalance is calculated based on the counterweight mass of the high-elasticity coupling to determine the balance quality level of the coupling.

[0111] The purpose of step 5 is to test the dynamic behavior of the coupling under gravity using the minimum counterweight, verify the static balance state of the coupling, and determine whether the coupling meets the static balance requirements.

[0112] Step 5 includes:

[0113] Step 5.1: Calculate the imbalance U0 of the static balancing fixture and distribute it to the outer diameter R of the coupling. a The theoretical counterweight mass is used to calculate the actual required counterweight mass M of the coupling. a At the maximum outer diameter R of the coupling a Select an initial weight point at any position and add a weight.

[0114] The imbalance U0 of the static balancing fixture is distributed to the outer diameter R of the coupling counterweight. a The theoretical counterweight mass is determined by the following formula:

[0115]

[0116] In the formula: U0 represents the imbalance of the static balancing fixture; R a This indicates the outer diameter of the coupling's counterweight.

[0117] The actual counterweight mass M of the coupling a Used to eliminate the imbalance U0 and achieve a precise static balance. Determined by the following formula:

[0118] M a =M-M' (3)

[0119] In the formula: M represents the initial minimum added counterweight mass; M' represents the imbalance U0 of the static balancing fixture distributed to the outer diameter R of the coupling counterweight. a The counterweight mass.

[0120] Step 5.2: Gently push the coupling to allow it to rotate freely, and observe the actual counterweight M. a Dynamic behavior under gravity, determining the actual counterweight M a Whether it rotates to the lowest point and comes to a standstill, or whether it oscillates slightly within ±15° of the theoretical lowest point.

[0121] Step 5.3: Under the same counterweight M a Under the given conditions, repeat the free rotation test to verify the consistency of the counterweight's behavior. If the counterweight M...a If the dynamic behavior of multiple tests is all rotated to the lowest point of static balance or slightly swings within the range of ±15° of the theoretical lowest point, it is determined that the static balance state of the coupling is qualified; if the weight M a If the dynamic behavior does not meet the determination standard, the mass distribution of the coupling is adjusted until the balance quality level requirement is met.

[0122] In step 5.3, the unbalance amount U a is determined by the following formula:

[0123] U a = M a × R a (4)

[0124] In the formula, M a represents the actual required weight of the coupling; and R a represents the maximum outer diameter of the coupling.

[0125] According to the calculation of formula (4), the unbalance amount U a of the coupling is obtained, and according to the standard GB / T 9239.1, the unbalance amount U a of the coupling corresponds to the balance quality level G1.

[0126] Embodiment

[0127] The static balance test method of the present application is compared and analyzed with the test bench of the prior art in the static balance test of the coupling. The test object is a high-precision coupling for ships, and the maximum outer diameter of the coupling is 2000mm and the weight is 10000kg. It is required that after the static balance test adjustment of the weight, the balance quality target of the coupling should be G1. The test bench includes the test bench of the prior art based on the clamping tool pillow block support design (the highest test precision reaches G6.3), and the test bench of the present application based on the hydraulic bearing support and modular static balance tool (combined with the static balance test method, supporting G1 level). The test speed range is 3-5 RPM (low-speed static balance test) or manual; the test times are repeated 5 times for each test group, and the average value is taken.

[0128] The test result comparison is shown in Table 2:

[0129]

[0130] Through the static balance test bench and the static balance test method, the test precision is significantly improved, the unbalance amount detection error is reduced to 0.5 g·mm, and the test demand of the high-precision coupling (target G1.0) can be met. At the same time, through the modular design and the hydraulic bearing support, the structural adaptability and the operation efficiency are greatly improved, and the stability of the test result is significantly enhanced. These improvements overcome the defects of the prior art, and provide reliable technical support for the static balance test of the high-precision coupling.

[0131] The above only describes the embodiments of the present application, and the well-known specific structures and characteristics in the scheme are not described in detail. It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the involved claims.

Claims

1. A high-precision static balancing test bench for shaft transmission equipment, characterized in that, The device includes a hydraulic bearing (2) and a static balancing fixture (3); the hydraulic bearing (2) includes a bearing housing (20) and a bearing bush (21); the bearing housing (20) has a hollow structure inside, and a bearing bush mounting seat is provided in the hollow structure, and the bearing bush (21) is installed in the bearing bush mounting seat; the two ends of the static balancing fixture (3) are columnar structures, and the columnar structures at both ends are respectively clearance-fitted with the bearing bush (21) of a hydraulic bearing (2) to achieve smooth rotation through the support of the hydraulic bearing (2); The hydraulic bearing (2) has an oil passage for introducing external oil into the gap between the bearing bush (21) and the columnar structure to form a stable liquid oil film, so as to support the rotation of the columnar structure, reduce friction and ensure rotation accuracy; the static balancing fixture (3) adopts a segmented structure, including a first support shaft (30) and a second support shaft (33) respectively connected to the hydraulic bearings (2) on both sides, 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 connected together axially in sequence; the coupling (4) is sleeved on the static balancing fixture (3) and located between the two hydraulic bearings (2), and rotates coaxially with the static balancing fixture (3); The stepped shaft includes a first stepped shaft (31) and a second stepped shaft (32) connected axially. The coupling (4) includes a first coupling (40) and a second coupling (41) that are fastened 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 combination, so that the coupling (4) can be stably mounted on the static balance fixture (3).

2. The high-precision static balance test bench for shaft transmission equipment according to claim 1, characterized in that, The upper part of the bearing housing (20) is provided with an oil inlet (200) for introducing lubricating oil from the external oil supply system, and the lower part of the bearing housing (20) is provided with an oil return port (201) for discharging excess lubricating oil. The hydraulic bearing bush includes a bearing block and a bearing alloy disposed on the inner ring of the bearing block. The bearing alloy has a thickness of 3-10mm. The bearing bush (21) is provided with an oil passage that matches the oil inlet (200) and the oil return port (201). The oil inlet (200) is connected to the oil inlet passage (2100) through an oil pipe (202) located inside the bearing housing (20). The oil inlet passage (2100) has an L-shaped structure. It extends axially from one end of the bearing bush (21) to a certain depth and then extends towards its axial direction to the inner surface of the bearing bush (21). 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 (200), forms an oil film on the inner surface of the bearing bush (21), and flows into the cavity of the bearing housing (20) through the oil return passage, and then is discharged to the oil return port (201).

3. The high-precision static balancing test bench for shaft transmission equipment according to claim 2, characterized in that, The hydraulic bearing (2) also includes an end cap (22), a fastening clamp (23), and a rotary seal. The end cap (22) is installed at both ends of the bearing seat (20). The end cap (22) has a central hole coaxial with the bearing bush (21). A rotary seal is installed in the central hole. The rotary seal contacts the first support shaft (30) and the second support shaft (33) to form a dynamic seal. The fastening clamp (23) fits against the end cap (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.

4. A method for using the high-precision static balancing test bench for shaft transmission equipment as described in any one of claims 1-3, characterized in that, The methods include: Step 1: Install the hydraulic bearing and static balancing fixture, adjust the test bench, and calibrate the static balancing fixture to be level. Step 2: Gently push the static balancing fixture to rotate it clockwise and counterclockwise respectively, and observe whether it can stop at any position to preliminarily test the free balance state of the static balancing fixture. Step 3: Add a minimum counterweight at any position on the maximum outer diameter of the static balancing fixture to guide the center of gravity of the imbalance. Observe whether the counterweight rotates to the lowest point and stops under the action of gravity, or swings slightly within a predetermined angle range of the theoretical lowest point. Determine the balance quality level of the static balancing fixture according to the imbalance calculation formula, and verify the determination result through multiple tests. When the static balancing fixture reaches the balance quality level required for the static balance test of the high-elasticity coupling, proceed to step 4; otherwise, calibrate the static balancing fixture and then proceed to step 4. Step 4: Install the coupling onto the static balancing fixture and mark the lowest point of the coupling. Divide the outer ring of the coupling into 8 to 12 equal sections. At the double-ended stud positions on the outer ring of the coupling, adjust the compensation mass by adding balance blocks or adjusting the position of the bolts, and mark the adjustment positions. At the marked double-ended stud positions, gradually replace the initial compensation mass with flat shims of equal weight to ensure the stability and long-term reliability of the adjustment. Repeat the adjustment and testing until the coupling remains stationary at each of the equal division points on the test bench without spontaneous rotation, thus completing the static balancing adjustment. Step 5: At the maximum outer diameter of the high-elasticity coupling Set a minimum counterweight of known mass. By observing the counterweight The dynamic behavior under gravity is used to determine whether it rotates to the lowest point and stops or oscillates slightly within a predetermined range of the theoretical lowest point; the test results are verified through multiple tests, and if the counterweight performance meets the above conditions, the static balance test of the high-elasticity coupling is deemed qualified; the unbalance is calculated based on the counterweight mass of the high-elasticity coupling to determine the balance quality level of the coupling.

5. The method for high-precision static balancing test bench for shaft transmission equipment according to claim 4, characterized in that, Step 3 includes: Step 3.1: At the maximum outer diameter of the static balancing fixture Add a counterweight of known mass at any position. Counterweight The quality meets the test accuracy requirements, and the smaller value is taken; Step 3.2: After adding the counterweight, gently push the static balancing fixture to allow it to rotate freely, observe the dynamic behavior of the counterweight under gravity, and determine the counterweight's performance. Whether it rotates to the lowest point and comes to a standstill or oscillates slightly within ±15° of the theoretical lowest point; Step 3.3: Calculate the imbalance of the static balancing fixture. Determine whether its balance quality meets the G1 level. If it does, proceed to the next test step; if it does not, adjust the installation and coaxiality of the static balancing fixture, correct the horizontal state of the test bench, and optimize the weight distribution to reduce the amount of imbalance.

6. The method for high-precision static balancing test bench for shaft transmission equipment according to claim 4, characterized in that, Step 4 includes: Step 4.1: Install the coupling onto the calibrated static balancing fixture, ensuring that the axes of the coupling and the static balancing fixture are coaxially aligned. Check that the connecting parts of the coupling and the static balancing fixture are secure and confirm that they can rotate freely on the hydraulic bearing. Step 4.2: Keep the coupling stationary and, by observing its natural position under the influence of gravity, make a starting mark at the lowest point of the coupling as the reference point for adjustment; Step 4.3: Based on the structure of the outer ring of the coupling, divide the outer ring into 8 to 12 equal areas, and mark each area with equal intervals as adjustment reference points; Step 4.4: Install double-ended studs in the threaded holes of the equally divided areas of the outer ring of the coupling, and adjust the size and position of the compensating mass at the selected double-ended stud positions by adding balance blocks or adjusting the position of the bolts to compensate for the offset of the center of gravity of the coupling. Step 4.5: After adjusting the compensation quality, gently push the coupling to observe its dynamic behavior, judge the adjustment effect, record the position of the double-ended stud that was adjusted, and gradually optimize the compensation quality. Step 4.6: At the marked double-ended stud position, replace the initial compensation mass balance block with a flat shim of equal weight. Verify its dynamic behavior on the test bench by rotating the coupling multiple times. Fine-tune the flat shim or add additional compensation mass until the coupling remains stationary and does not rotate spontaneously at all equal division points. Record the final adjustment results, including the position and weight of the compensation mass.

7. The method for high-precision static balancing test bench for shaft transmission equipment according to claim 6, characterized in that, In step 4.3, the coupling is divided into 8 to 12 equal regions, with each region having an angular interval of 30° to 45°.

8. The method for high-precision static balancing test bench for shaft transmission equipment according to claim 4, characterized in that, Step 5 includes: Step 5.1: Calculate the imbalance of the static balancing fixture. Distributed to the outer diameter of the coupling The theoretical counterweight mass is used to calculate the actual required counterweight mass of the coupling. At the maximum outer diameter of the coupling Select an initial weight point at any location and add a counterweight; Step 5.2: Gently push the coupling to allow it to rotate freely and observe the actual counterweight. Dynamic behavior under gravity to determine the actual counterweight. Whether it rotates to the lowest point and comes to a standstill, or whether it oscillates slightly within ±15° of the theoretical lowest point; Step 5.3: Under the same counterweight Under the given conditions and location, repeat the free rotation test to verify the consistency of the counterweight's behavior. If the counterweight... If the dynamic behavior of the coupling in multiple tests is such that it rotates to the lowest point and comes to a standstill, or oscillates slightly within ±15° of the theoretical lowest point, then the static balance of the coupling is deemed acceptable; if the counterweight... If the dynamic behavior does not meet the judgment criteria, the mass distribution of the coupling shall be adjusted until the balance quality level requirement is met.

9. The method for high-precision static balancing test bench for shaft transmission equipment according to claim 8, characterized in that, In step 5.1, the imbalance of the static balancing fixture Distributed to the outer diameter of the coupling counterweight The theoretical counterweight mass is determined by the following formula: ； In the formula: This indicates the amount of imbalance in a statically balanced fixture. Indicates the outer diameter of the coupling counterweight; Actual counterweight mass of the coupling Used to eliminate imbalance And achieve a precise static equilibrium state, determined by the following formula: ； In the formula: This indicates the minimum initial weight to be added; Indicates the imbalance of static balancing fixtures Distributed to the outer diameter of the coupling counterweight The counterweight mass on top; In step 5.3, the imbalance of the coupling Determined by the following formula: ； In the formula: This indicates the actual counterweight required for the coupling; This indicates the maximum outer diameter of the coupling.

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