High-precision static balance test bed and method for shafting transmission equipment

Abstract

The invention belongs to the technical field of marine shafting transmission device couplings, and particularly relates to a high-precision static balance test bed and method for shafting transmission equipment, the test bed comprises a hydraulic bearing and a static balance tool, and the hydraulic bearing is composed of a bearing seat and a bearing bush installed in the bearing seat; the two ends of the static balance tool are of columnar structures, the static balance tool is in clearance fit with a bearing bush of the hydraulic bearing, stable rotation is achieved through supporting of the hydraulic bearing, the hydraulic bearing is provided with an oil duct, external oil is introduced into the gap between the bearing bush and the columnar structures, a stable liquid oil film is formed, rotation is supported, friction is reduced, and precision is ensured. The coupling is formed by sequentially connecting a first supporting shaft, a plurality of stepped shafts and a second supporting shaft in series in the axial direction, the static balance tool is sleeved with the coupling, the coupling and the static balance tool rotate coaxially, and the coupling is located between the hydraulic bearings. 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, the structural adaptability and the vibration resistance are remarkably improved.

Description

Technical Field

[0001] The invention belongs to the technical field of couplings of marine shaft transmission devices, and in particular relates to a high-precision static balance test bench and method for shaft transmission equipment. Background Art

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

[0003] In order to ensure the working stability and reliability of the coupling, it is necessary to conduct a static balance test on it. 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. At present, static balance tests are usually completed by 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 existing test benches have significant design and performance defects, which make it difficult to meet the special needs of coupling testing:

[0005] 1. Insufficient test accuracy: As a high-precision transmission component, the coupling needs to be subjected to precise static balance test. The balance quality level is an important indicator to measure the balance of the rotating parts. According to the definition of standard GB / T 9239.1, the balance quality levels include G6.3, G2.5 and G1.0 or higher. Among them, G6.3 is suitable for general industrial equipment, such as ordinary motors, pumps, general machinery, etc., which belongs to medium balance quality. G2.5 is suitable for equipment with high balance requirements, such as compressors, machine tool drives, etc., which belongs to high balance quality. G1.0 or higher is suitable for ultra-high precision equipment, such as imaging equipment, grinder drives, etc., which require extremely high balance accuracy. The test accuracy of the current test bench can only meet the G6.3 level, which is difficult to meet the high-precision requirements of the static balance test of the coupling (such as G2.5 or G1.0), so it is impossible to detect small mass deviations and unbalanced torques, affecting the reliability of the test results. Since each coupling needs to be weighted according to the test results, a test bench with insufficient accuracy may lead to improper weight adjustment, affecting the actual application performance of the coupling and reducing the stability and durability of the system operation.

[0006] 2. Insufficient structural adaptability: Existing static balance test benches usually use clamping fixtures. The clamping fixtures are mainly designed for couplings with simple structures and regular shapes. The complexity and diversity of marine coupling structures are not fully considered. In addition, different marine couplings have significant differences in appearance, weight and internal geometric characteristics. The clamping fixture only contacts the two ends of the coupling, resulting in loose clamping or additional eccentricity. The coupling usually contains multiple parts, which further causes eccentricity or uneven quality. The fixture design is universal. Large-size couplings and small-size couplings require different support and fixture configurations, but the 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 inserted inside the coupling. The two ends of the dummy shaft are respectively placed in the arc-shaped grooves of the two pillow blocks. This form of support 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 surface of the pillow block 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 supporting structure is prone to resonance or deformation during frequent or long-term tests, which further causes 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 device that can improve the adaptability to the diverse structures of the coupling and the stability of the test process while ensuring high test accuracy, so as to meet the requirements of modern ship systems for the efficiency and reliability of the coupling. Summary of the invention

[0009] In view of the defects of the prior art, the present invention proposes a high-precision static balancing test bench and method for shaft transmission equipment. 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 balancing tests.

[0010] On the one hand, the present invention 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; both ends of the static balance tool are columnar structures, and the columnar structures at both ends are respectively matched with a bearing bush of a hydraulic bearing in clearance, so as to achieve stable rotation through the support of the hydraulic bearing;

[0011] 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; the static balancing tool adopts a segmented structure, including 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.

[0012] 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.

[0013] In a preferred implementation, further, the interior of the bearing seat is a cavity structure, a bearing bush mounting seat is provided in the cavity structure, and the bearing bush is installed in the bearing bush 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] The bearing shell of the hydraulic bearing includes a shell block and a bearing alloy arranged on the inner ring of the shell block, and the thickness of the bearing alloy is 3-10mm; the bearing shell is provided with an oil channel matching the oil inlet and the oil return port, wherein the oil inlet is connected to the oil inlet channel through an oil pipe located inside the bearing seat; the oil inlet channel is an L-shaped structure, extending axially from one end of the bearing shell to a certain depth and then extending in its axial direction to the inner surface of the bearing shell; the oil return channel has the same structure as the oil inlet channel, and the lubricating oil enters the oil inlet channel through the oil inlet, forms an oil film on the inner surface of the bearing shell, and flows into the bearing seat cavity through the oil return channel, and then is discharged to the oil return port.

[0015] In a preferred implementation, further, the hydraulic bearing also includes an end cover, a fastening clamp and a rotating 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 rotating seal is installed in the center hole, the rotating seal is in contact with the first support shaft and the second support shaft to form a dynamic seal; the fastening clamp 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.

[0016] On the other hand, the present invention also provides a method for using any one of the above-mentioned high-precision static balance test benches for shaft transmission equipment, the method comprising:

[0017] Step 1: Install the hydraulic bearing and static balancing fixture, adjust the test bench, and perform horizontal calibration on the static balancing fixture;

[0018] Step 2: Gently push the static balancing tool to rotate it clockwise and counterclockwise 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 any position of the maximum outer diameter of the static balancing tool 3 to guide the center of gravity of the unbalanced amount to shift, and observe whether the counterweight rotates to the lowest point and stops under the action of gravity, or swings slightly within the predetermined angle range of 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 for the static balancing test of the high elastic coupling, execute step 4; otherwise, execute step 4 after calibrating the static balancing tool;

[0020] Step 4: Install the coupling on the static balancing fixture and make a starting mark at the lowest point of the coupling. Divide the outer ring of the coupling into 8 to 12 equal areas. At the stud position of the outer ring of the coupling, increase or decrease the compensation mass to adjust the mass by adding a balancing block or adjusting the bolt position, and mark the adjustment position. At the marked stud position, gradually replace the initial compensation mass with flat washers of equal weight to ensure the stability and long-term reliability of the adjustment. Repeat the adjustment and test until the coupling remains stationary at each divided point on the test bench without spontaneous rotation, and the static balancing adjustment is completed.

[0021] Step 5: At the maximum outer diameter R of the high elastic coupling a Set a minimum counterweight M of known mass a , by observing the counterweight M a The dynamic behavior under the action of gravity determines whether it rotates to the lowest point and stops or swings slightly within the 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-elastic coupling is determined to be qualified; the imbalance amount is calculated based on the counterweight mass of the high-elastic coupling to determine the balance quality level of the coupling.

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

[0023] Step 3.1: Add a known weight M0 at any position of the maximum outer diameter R0 of the static balancing fixture. The mass of the weight M0 meets the test accuracy requirements and takes a smaller value;

[0024] Step 3.2: After adding the counterweight, gently push the static balance fixture to make it rotate freely, observe the dynamic behavior of the counterweight under the action of gravity, and determine whether the counterweight M0 rotates to the lowest point and stops or swings 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 so, proceed to the next test step; if 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, further, step 4 includes:

[0027] Step 4.1: Install the coupling onto the calibrated static balancing fixture, ensure that the axes of the coupling and the static balancing fixture are coaxially aligned, check whether the connecting parts between the coupling and the static balancing fixture are tight, and confirm that they can rotate freely on the hydraulic bearing;

[0028] Step 4.2: Make the coupling still, observe its natural position under the action of gravity, and make a starting mark at the lowest point of the coupling as the reference point for adjustment;

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

[0030] Step 4.4: Install studs in the screw holes in the equally divided areas of the outer ring of the coupling, and adjust the size and position of the compensation mass at the selected stud positions by adding balancing blocks or adjusting the bolt positions to compensate for the center of gravity offset of the coupling;

[0031] Step 4.5: After adjusting the compensation mass, gently push the coupling to observe its dynamic behavior, judge the adjustment effect, record the adjusted stud position, and gradually optimize the compensation mass;

[0032] Step 4.6: Replace the balancing blocks of the initial compensating mass with flat washers of equal weight at the marked stud positions. Verify the dynamic behavior of the coupling on the test bench by rotating the coupling several times. Fine-tune the flat washers or add additional compensating mass until the coupling remains stationary and has no spontaneous rotation at all divided points. Record the final adjustment results, including the position and weight of the compensating mass.

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

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

[0035] Step 5.1: Calculate the unbalance U0 of the static balancing fixture and distribute it to the outer diameter R of the coupling a Theoretical counterweight mass on the coupling is calculated based on the theoretical counterweight mass. a , at the maximum outer diameter R of the coupling a Select an initial counterweight point at any position to add counterweight;

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

[0037] Step 5.3: With the same weight M a Repeat the free rotation test under the same conditions to verify the consistency of the weight behavior. aThe dynamic behavior of multiple tests rotates to the lowest point and stops, or swings slightly within the range of ±15° of the theoretical lowest point, and the static balance state of the coupling is judged to be qualified; if the counterweight M a If the dynamic behavior does not meet the judgment criteria, adjust the mass distribution of the coupling until the balance quality level requirements are achieved.

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

[0039]

[0040] Where: U0 represents the unbalanced amount of the static balancing tool; R a Indicates the outer diameter of the coupling weight;

[0041] The actual counterweight mass M of the coupling a Used to eliminate the unbalance U0 and achieve an accurate static balance state. Determined by the following formula:

[0042] M a =M-M'

[0043] Where: M represents the minimum counterweight mass added initially; M' represents the distribution of the unbalanced amount U0 of the static balancing fixture to the outer diameter R of the coupling counterweight a The mass of the counterweight on the

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

[0045] U a =M a ×R a

[0046] Where: M a Indicates the actual counterweight required for the coupling; R a Indicates the maximum outer diameter of the coupling. A high-precision static balance test bench for shaft transmission equipment.

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

[0048] First, the high-precision static balance test bench for shaft transmission equipment of the present invention supports the static balance fixture through hydraulic bearings, and uses oil film lubrication to achieve low-friction and smooth rotation, making the static balance test of the coupling 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 bench. The static balance fixture adopts a segmented structure, and flexible splicing is achieved through the threaded connection of the first support shaft, multiple stepped shafts and the second support shaft, which enhances the stability of the structure and modular convenience.

[0049] 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 present invention 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.

[0050] Third, in the preferred implementation, the bearing shell of the hydraulic bearing of the present invention adopts a structure with a bearing alloy inside, and is matched with an L-shaped oil inlet channel design, so that the lubricating oil can be effectively distributed between the bearing shell and the rotating shaft, forming a stable oil film, reducing friction and extending life. At the same time, the design of the end cover and the rotating seal provides a good sealing effect, preventing the leakage of lubricating oil and blocking the entry of external pollutants, thereby improving the durability and operation stability of the system while ensuring the lubrication performance.

[0051] Fourth, in the preferred implementation, the base of the present invention 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.

[0052] Fifth, the method of the high-precision static balancing test bench for shaft transmission equipment of the present invention ensures the balanced state of the static balancing tooling and the coupling through precise installation, calibration and step-by-step testing process, and realizes high-precision unbalance detection and quality adjustment. Through staged weight adjustment and unbalance calculation, the balance quality level of the coupling is further determined, ensuring the reliability and repeatability of the test results, thereby providing a scientific and accurate evaluation of the static balancing performance of the coupling. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a partial cross-sectional view of a high-precision static balance test bench for shaft transmission equipment according to an embodiment of the present invention;

[0054] Figure 2 is a structural cross-sectional view of a hydraulic bearing disposed at the bottom of a static balancing tooling according to an embodiment of the present invention;

[0055] Figure 3 It is a structural cross-sectional view of a bearing bushing arranged at the bottom of a static balancing tooling according to an embodiment of the present invention;

[0056] Figure 4 It is a flow chart of a high-precision static balancing test bench method for shaft transmission equipment according to an embodiment of the present invention.

[0057] Among them, 1-base; 2-hydraulic bearing; 20-bearing seat; 200-oil inlet; 201-oil return port; 202-oil pipe; 21-bearing shell; 210-wafer block; 2100-oil inlet channel; 211-bearing alloy; 22-end cover; 23-fastening clamp; 3-static balancing tooling; 30-first support shaft; 31-first step shaft; 32-second step shaft; 33-second support shaft; 4-coupling; 40-first coupling; 41-second coupling. DETAILED DESCRIPTION

[0058] 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.

[0059] In the description of this application, the terms "first", "second", and "third" are used for descriptive purposes only and are not to 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 be a fixed connection, a detachable connection, or an integral connection; "connected" can be 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.

[0060] In the description of the present application, it should be understood that the directions or positional relationships indicated by the terms "up", "down", "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present 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 orientation, and therefore, should not be understood as a limitation on the present application.

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

[0062] As the instruction manual Figure 1The present invention describes a high-precision static balance test bench for shaft transmission equipment, including a hydraulic bearing 2 and a static balance fixture 3. The hydraulic bearing 2 includes a bearing seat 20 and a bearing shell 21 installed inside the bearing seat 20. The two ends of the static balance fixture 3 are columnar structures, and the columnar structures at both ends are clearance-matched with one hydraulic bearing 2. The static balance fixture 3 is a core component of the test bench, and its two ends are supported by clearance-matching with the hydraulic bearing 2 to achieve smooth rotation. An oil channel is provided in the hydraulic bearing 2, which is used to introduce 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 balance fixture 3 and is located between the two hydraulic bearings 2 to ensure that the coupling 4 can achieve coaxial rotation with the static balance fixture 3. The entire bench provides a low-friction, high-precision support environment for the static balance test of the coupling through the close connection between the hydraulic bearing and the static balance fixture, so that the static balance performance of the coupling can be effectively evaluated during the test.

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

[0064] 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 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 provided with threaded holes and mounting surfaces connected to each other. The first support shaft 30, the plurality of 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.

[0065] 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 the first coupling 40 and the second coupling 41 that are snapped together, the internal cavity profile formed by the first coupling 40 and the second coupling 41 matches the outer profile after the first stepped shaft 31 and the second stepped shaft 32 are combined, so that the coupling 4 can be stably mounted on the static balancing fixture 3 to ensure the coaxiality between the coupling 4 and the static balancing fixture 3 during the test. The sections of the static balancing fixture 3 are tightly connected to ensure the coaxial accuracy between the shafts to avoid the imbalance caused by the misalignment of the components. This splicing method facilitates the disassembly and maintenance of the fixture, and also improves the flexibility of manufacturing and assembly.

[0066] 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 lateral 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.

[0067] During the installation process, first fit the second coupling 41 with 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 by 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, align it with the second coupling 41, and fasten the first coupling 40 to the second coupling 41 by 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.

[0068] In the implementation of this application, as shown in the attached specification 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 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 is provided with an oil return port 201 for discharging excess lubricating oil in the cavity of the bearing shell 21 and the bearing seat 20. 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 and the oil inlet passage 2100 are connected through an oil pipe 202 located inside the bearing seat 20, and the oil return passage is directly connected to the inner cavity of the bearing seat 20. The oil inlet passage 2100 is an L-shaped structure, and the oil passage extends axially from one end of the bearing shell 21 to a certain depth, and then extends vertically upward until the inner surface of the bearing shell 21. This design ensures that after the lubricating oil flows in from 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 passage has the same structure as the oil inlet passage and is arranged at the same end of the bearing 21 as the oil inlet passage. The lubricating oil enters the oil inlet passage of the bearing 21 through the oil inlet 200, and forms a uniform oil film on the inner surface of the bearing 21 to lubricate the contact surface between the bearing 21 and the static balancing fixture 3. The excess oil flows to the oil return port 201 through the return oil passage, thereby realizing the circulation of the oil.

[0069] The bearing bush 21 includes a pad 210 and a bearing alloy 211 disposed on the inner ring of the pad 210. The shape of the pad 210 precisely fits the bearing bush mounting seat of the bearing seat 20 to ensure that it remains stable in the bearing seat 20. The bearing alloy 211 is cast on the inner ring surface of the pad 210 to improve the wear resistance and load-bearing capacity of the bearing bush 21. The thickness of the bearing alloy 211 is 3-10 mm, and the thickness of the bearing alloy layer is reasonably designed to evenly distribute the oil film and maintain the durability of the bearing bush 21 under high load.

[0070] In the implementation of the present application, the hydraulic bearing 2 also 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 closure and stability of the bearing. A center hole coaxial with the bearing shell 21 is provided on the end cover 22 to ensure the coaxiality of the rotating shaft and the bearing shell, and improve the coaxiality and stability of the system. The rotary seal is installed in the center hole of the end cover 22, and the rotary seal contacts the first support shaft 30 and the second support shaft 33 to form a dynamic seal to prevent lubricating oil from leaking from the inside of the bearing and prevent external dust or impurities from entering the bearing cavity. The end cover 22 is fixed to the bearing seat by bolts or other fastening devices to form a closed cavity to protect the internal components from the invasion of external contaminants, while supporting the installation of the rotary seal and the fastening clamp. The rotary seal is made of wear-resistant material, which can withstand the high-frequency rotation of the rotating shaft, maintain a stable sealing effect and extend the service life of the seal. Each fastening hoop 23 is close to the end cover 22 and is fixed to the first support shaft 30 and the second support shaft 33 by bolts or locking devices. The design of the fastening 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.

[0071] In the implementation of the present application, the high-precision static balance test bench for shaft transmission equipment also includes a base 1. The top surface of each base 1 is connected to the bearing seat 20 to form a solid support base to ensure the stability of the bearing seat during the test. Between the joint surface of the base 1 and the bearing seat 20, by adding or removing gaskets, the height of the bearing seat 20 can be adjusted, and then the position height of the coupling 4 installed on the static balance fixture 3 can be adjusted. The gasket adjustment mechanism ensures the rotation space of the coupling 4 after installation, avoids interference caused by height deviation, and ensures that the coupling can rotate smoothly and unimpeded 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 provided on the sides of the base 1 to enhance the lateral rigidity of the base and prevent lateral deformation of the base structure during the test. Ribs arranged up and down are provided inside the base 1, and the vertical plates and side plates are connected by the ribs, which effectively improves the overall structural rigidity of the base. The design of the ribs provides additional support when carrying heavy objects and ensures that the base does not deform under gravity and operating pressure.

[0073] The present application also describes a method for a high-precision static balancing test bench for shaft transmission equipment, the method comprising:

[0074] Step 1: Install the hydraulic bearing and static balancing fixture, adjust the test bench, and perform horizontal calibration on the static balancing fixture.

[0075] The purpose of step 1 is to ensure that the installation height and position of the hydraulic bearing and static balancing fixture are accurate. By adjusting the test bench and calibrating with a level, the axis of the static balancing fixture is parallel to the ground to ensure its free rotation ability during the test, providing mechanical stability and accuracy for subsequent static balancing tests.

[0076] Step 1 specifically includes:

[0077] Step 1.1: Place an adjusting shim between the mating surface of the base and the bearing seat, select an appropriate shim thickness to meet the height requirements of the coupling and static balancing tooling, and fix the bearing seat on the base.

[0078] Step 1.2: sequentially assemble the components of the static balancing tooling, including connecting the first support shaft and the first stepped shaft, the first stepped shaft and the second stepped shaft, and the second stepped shaft and the second support shaft to form a continuous coaxial structure.

[0079] Step 1.3: Install both ends of the assembled static balancing tooling in the hydraulic bearing, and place a level meter on the upper surface of the hydraulic bearing to detect the horizontal state of the static balancing tooling.

[0080] Step 1.4: According to the reading of the level, adjust the thickness of the shim between the base and the hydraulic bearing until the bubble of the level is centered to ensure that the axis of the static balancing fixture is completely horizontal.

[0081] Step 2: Gently push the static balancing tool to rotate it clockwise and counterclockwise respectively, and observe whether it can remain still at any position to preliminarily detect the free balance state of the static balancing tool.

[0082] The purpose of step 2 is to push the static balancing fixture gently to make it rotate freely in clockwise and counterclockwise directions, preliminarily detect its free balance state, and quickly determine whether the static balancing fixture has imbalance. If imbalance is found, determine its direction and degree to provide a basis for the next step of optimization and quantitative analysis.

[0083] Step 2 specifically includes:

[0084] Step 2.1: Fill the center hole of the bearing shell of the hydraulic bearing 2 with hydraulic oil to make the static balancing tool 3 float. Apply force to rotate the static balancing tool 3 in the clockwise direction. Stop after rotating to a certain angle. Check whether the static balancing tool 3 is stationary at any position.

[0085] Step 2.2: Apply force to rotate the static balancing tool 3 in the counterclockwise direction, stop after rotating to a certain angle, and detect whether the static balancing tool 3 is stationary at any position.

[0086] Step 2.3: If the static balancing fixture 3 always returns to a fixed position after stopping, it is determined that it is in an unbalanced state, and step 3 is executed; if the static balancing fixture 3 can be stationary at any angle, it is determined that it is in a free balance state, and step 4 is directly executed. 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 balancing fixture 3 to guide the center of gravity of the imbalance to shift, and observe whether the counterweight rotates to the lowest point and stops under the action of gravity, or swings slightly within the predetermined angle range of the theoretical lowest point. Determine the balance quality level of the static balancing fixture based on 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 balancing test of the high-elastic coupling, execute step 4; otherwise, execute step 4 after calibrating the static balancing fixture.

[0088] The purpose of step 3 is to quantitatively evaluate the imbalance of the static balancing fixture by adding the minimum counterweight, determine whether it meets the target balance quality level G1, and optimize and adjust it based on the results to ensure that it meets the high-precision static balance requirements.

[0089] Step 3 includes:

[0090] 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 meets the test accuracy requirements and takes a smaller value.

[0091] Smaller values ​​such as 10g or less are recommended to facilitate step-by-step adjustments.

[0092] Step 3.2: After adding the counterweight, gently push the static balance fixture to make it rotate freely, observe the dynamic behavior of the counterweight under the action of gravity, and determine whether the counterweight M0 rotates to the lowest point and remains stationary or swings slightly within ±15° of the theoretical lowest point.

[0093] Step 3.3: Calculate the unbalance U0 of the static balancing fixture and determine whether its balance quality meets the G1 level. If so, proceed to the next test step; if 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.

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

[0095] Balance quality level (G) Allowable unbalance (g·mm / kg) Typical application scenarios G0.4 0.4 High-precision gyroscope G1 1 Imaging equipment, grinding machine drive device G2.5 2.5 Compressors, machine tool drives G6.3 6.3 General motors, pumps, general machinery

[0096] The unbalance of the static balancing fixture is determined by the following formula:

[0097] U0=R0×M0(1)

[0098] Wherein: U0 represents the unbalance amount of the static balancing fixture (unit: g·mm or kg·m); R0 represents the maximum outer diameter of the static balancing fixture 3 (unit: mm or m); M0 represents the minimum counterweight (unit: g or kg).

[0099] Step 4: Install the coupling on the static balancing fixture and make a starting mark at the lowest point of the coupling. Divide the outer ring of the coupling into 8 to 12 equal areas. At the stud position of the outer ring of the coupling, increase or decrease the compensation mass to adjust the mass by adding balancing blocks or adjusting the bolt position, and mark the adjustment position. At the marked stud position, gradually replace the initial compensation mass with flat gaskets of equal weight to ensure the stability and long-term reliability of the adjustment. Repeat the adjustment and test until the coupling remains stationary at each divided point on the test bench without spontaneous rotation, and the static balance adjustment is completed.

[0100] The purpose of step 4 is to adjust the mass distribution of the outer ring of the high-elastic coupling so that the center of gravity of the coupling reaches a static equilibrium state. This stage focuses on the initial adjustment and optimization of mass compensation, including adding or reducing compensation mass, and verifying the adjustment effect through dynamic observation, gradually replacing temporary compensation mass with flat gaskets to ensure long-term stability.

[0101] Step 4 includes:

[0102] Step 4.1: Install the coupling onto the calibrated static balancing fixture, ensure that the axes of the coupling and the static balancing fixture are coaxially aligned, check whether the connection parts between the coupling and the static balancing fixture are tight, and confirm that they can rotate freely on the hydraulic bearings.

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

[0104] Step 4.3: Divide the outer ring into 8 to 12 equal areas according to the structure of the outer ring of the coupling, and mark each area with equal intervals as adjustment reference points.

[0105] Specifically, the coupling is divided into 8 to 12 equally divided regions, and the angular interval of each region is 30° to 45°.

[0106] Step 4.4: Install studs in the screw holes in the equally divided areas of the outer ring of the coupling, and at the selected stud positions, adjust the size and position of the compensating mass by adding balancing blocks or adjusting the bolt positions to compensate for the center of gravity offset of the coupling.

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

[0108] Step 4.6: Replace the balancing blocks of the initial compensating mass with flat washers of equal weight at the marked stud positions. Verify the dynamic behavior of the coupling on the test bench by rotating the coupling several times. Fine-tune the flat washers or add additional compensating mass until the coupling remains stationary and has no spontaneous rotation at all divided points. Record the final adjustment results, including the position and weight of the compensating mass.

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

[0110] Step 5: At the maximum outer diameter R of the high elastic coupling a Set a minimum counterweight M of known mass a , by observing the counterweight M aThe dynamic behavior under the action of gravity determines whether it rotates to the lowest point and stops or swings slightly within the 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-elastic coupling is determined to be qualified; the imbalance amount is calculated based on the counterweight mass of the high-elastic coupling to determine the balance quality level of the coupling.

[0111] The purpose of step 5 is to use the minimum counterweight to test the dynamic behavior of the coupling under gravity, 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 unbalance U0 of the static balancing fixture and distribute it to the outer diameter R of the coupling a Theoretical counterweight mass on the coupling is calculated based on the theoretical counterweight mass. a , at the maximum outer diameter R of the coupling a Select an initial balancing point at any location to add balancing weight.

[0114] The unbalanced amount U0 of the static balancing tool is distributed to the outer diameter R of the coupling weight a The theoretical weight mass on the yoke is determined by the following formula:

[0115]

[0116] Where: U0 represents the unbalanced amount of the static balancing tool; R a Indicates the outer diameter of the coupling weight.

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

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

[0119] Where: M represents the minimum counterweight mass added initially; M' represents the distribution of the unbalanced amount U0 of the static balancing fixture to the outer diameter R of the coupling counterweight a The mass of the counterweight on.

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

[0121] Step 5.3: With the same weight M a Repeat the free rotation test under the same conditions to verify the consistency of the weight behavior.a The dynamic behavior of multiple tests rotates to the lowest point and stops, or swings slightly within the range of ±15° of the theoretical lowest point, and the static balance state of the coupling is judged to be qualified; if the counterweight M a If the dynamic behavior does not meet the judgment criteria, adjust the mass distribution of the coupling until the balance quality level requirements are achieved.

[0122] In step 5.3, the unbalance of the coupling is U a Determined by the following formula:

[0123] U a =M a ×R a (4)

[0124] Where: M a Indicates the actual counterweight required for the coupling; R a Indicates the maximum outer diameter of the coupling.

[0125] According to formula (4), the unbalance of the coupling U a , refer to standard GB / T 9239.1, and get the unbalance value U of the coupling a Corresponding to balance quality level G1.

[0126] Example

[0127] The static balancing test method of the present invention is used to compare and analyze the effect of the test bench in the static balancing test of the coupling with that of the prior art. The test object is a high-precision marine coupling with a maximum outer diameter of 2000mm and a weight of 10000kg. It is required to adjust the counterweight after the static balancing test, and the balance quality target of the coupling should be G1. The test bench includes a test bench designed based on a pillow block support of a clamping fixture in the prior art (the test accuracy reaches up to G6.3), and a test bench based on a hydraulic bearing support and a modular static balancing fixture of the present invention (combined with the static balancing test method, supporting the G1 level). The speed range of the test conditions is 3 to 5RPM (low-speed static balancing test) or manual; the number of tests is 5 repetitions for each group of tests, and the average value is taken.

[0128] The test results are compared in Table 2:

[0129]

[0130] Through the static balance test bench and static balance test method of the present invention, the test accuracy is significantly improved, and the unbalance detection error is reduced to 0.5g·mm, which can meet the test requirements of high-precision couplings (target G1.0). At the same time, through modular design and hydraulic bearing support, the structural adaptability and operating efficiency are greatly improved, and the stability of the test results is significantly enhanced. These improvements overcome the defects of the prior art and provide reliable technical support for the static balance test of high-precision couplings.

[0131] The above is only an embodiment of the present invention, and the common sense such as the known specific structure and characteristics in the scheme is 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, and the scope of the present invention is defined by the attached claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. A high-precision static balance test bench for shaft transmission equipment, characterized in that: It 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); both ends of the static balancing tool (3) are columnar structures, and the columnar structures at both ends are respectively clearance-matched with the bearing bush (21) of a hydraulic bearing (2) to achieve stable rotation through the support of the hydraulic bearing (2); The hydraulic bearing (2) is provided with an oil channel for introducing external oil into the gap between the bearing shell (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; 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 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 fixture (3) and is located between the two hydraulic bearings (2) and rotates coaxially with the static balancing fixture (3).

2. The high-precision static balance test bench for shaft transmission equipment according to claim 1 is 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 tooling (3).

3. The high-precision static balance test bench for shaft transmission equipment according to claim 1 is characterized in that: The interior of the bearing seat (20) is a cavity structure, a bearing bush mounting seat is provided in the cavity structure, and the bearing bush (21) is mounted in the bearing bush mounting seat; an oil inlet (200) is provided at the upper portion of the bearing seat (20) for introducing lubricating oil from an external oil supply system, and an oil return port (201) is provided at the lower portion of the bearing seat (20) for discharging excess lubricating oil; The bearing shell of the hydraulic bearing comprises a shell block and a bearing alloy arranged on the inner ring of the shell block, and the thickness of the bearing alloy is 3-10 mm; the bearing shell (21) is provided with an oil channel matching the oil inlet (200) and the oil return port (201), wherein the oil inlet (200) is connected to the oil inlet channel (2100) through an oil pipe (202) located inside the bearing seat (20); the oil inlet channel (2100) is an L-shaped structure, extending axially from one end of the bearing shell (21) to a certain depth and then extending in the axial direction to the inner surface of the bearing shell (21); the oil return channel has the same structure as the oil inlet channel, and lubricating oil enters the oil inlet channel (2100) through the oil inlet (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 channel, and then is discharged to the oil return port (201).

4. The high-precision static balance test bench for shaft transmission equipment according to claim 3 is characterized in that: The hydraulic bearing (2) also includes an end cover (22), a fastening hoop (23) and a rotating 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 rotating seal is installed in the center hole. The rotating 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.

5. A method for using the high-precision static balance test bench for shaft transmission equipment according to any one of claims 1 to 4, characterized in that: Methods include: Step 1: Install the hydraulic bearing and static balancing fixture, adjust the test bench, and perform horizontal calibration on the static balancing fixture; Step 2: Gently push the static balancing tool to rotate it clockwise and counterclockwise respectively, and observe whether it can be stationary at any position to preliminarily detect the free balance state of the static balancing tool; Step 3: Add a minimum counterweight at any position of the maximum outer diameter of the static balancing tool to guide the center of gravity of the unbalanced amount to shift, and observe whether the counterweight rotates to the lowest point and stops under the action of gravity, or swings slightly within the predetermined angle range of 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 for the static balancing test of the high elastic coupling, execute step 4; otherwise, execute step 4 after calibrating the static balancing tool; Step 4: Install the coupling on the static balancing fixture and make a starting mark at the lowest point of the coupling. Divide the outer ring of the coupling into 8 to 12 equal areas. At the stud position of the outer ring of the coupling, increase or decrease the compensation mass to adjust the mass by adding a balancing block or adjusting the bolt position, and mark the adjustment position. At the marked stud position, gradually replace the initial compensation mass with flat washers of equal weight to ensure the stability and long-term reliability of the adjustment. Repeat the adjustment and test until the coupling remains stationary at each divided point on the test bench without spontaneous rotation, and the static balancing adjustment is completed. Step 5: At the maximum outer diameter R of the high elastic coupling a Set a minimum counterweight M of known mass a , by observing the counterweight M a The dynamic behavior under the action of gravity determines whether it rotates to the lowest point and stops or swings slightly within the 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-elastic coupling is determined to be qualified; the imbalance amount is calculated based on the counterweight mass of the high-elastic coupling to determine the balance quality level of the coupling.

6. The method for high-precision static balancing test bench of shaft transmission equipment according to claim 5, characterized in that: Step 3 includes: Step 3.1: Add a known weight M0 at any position of the maximum outer diameter R0 of the static balancing fixture. The mass of the weight M0 meets the test accuracy requirements and takes a smaller value; Step 3.2: After adding the counterweight, gently push the static balance fixture to make it rotate freely, observe the dynamic behavior of the counterweight under the action of gravity, and determine whether the counterweight M0 rotates to the lowest point and stops or swings slightly within ±15° of the theoretical lowest point; Step 3.3: Calculate the unbalance U0 of the static balancing fixture and determine whether its balance quality meets the G1 level. If so, proceed to the next test step; if 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.

7. The method for high-precision static balancing test bench of shaft transmission equipment according to claim 5, characterized in that: Step 4 includes: Step 4.1: Install the coupling onto the calibrated static balancing fixture, ensure that the axes of the coupling and the static balancing fixture are coaxially aligned, check whether the connecting parts between the coupling and the static balancing fixture are tight, and confirm that they can rotate freely on the hydraulic bearing; Step 4.2: Make the coupling still, observe its natural position under the action of gravity, and make a starting mark at the lowest point of the coupling as the reference point for adjustment; Step 4.3: Divide the outer ring of the coupling into 8 to 12 equal areas according to its structure, and mark each area with equal intervals as adjustment reference points; Step 4.4: Install studs in the screw holes in the equally divided areas of the outer ring of the coupling, and adjust the size and position of the compensation mass at the selected stud positions by adding balancing blocks or adjusting the bolt positions to compensate for the center of gravity offset of the coupling; Step 4.5: After adjusting the compensation mass, gently push the coupling to observe its dynamic behavior, judge the adjustment effect, record the adjusted stud position, and gradually optimize the compensation mass; Step 4.6: Replace the balancing blocks of the initial compensating mass with flat washers of equal weight at the marked stud positions. Verify the dynamic behavior of the coupling on the test bench by rotating the coupling several times. Fine-tune the flat washers or add additional compensating mass until the coupling remains stationary and has no spontaneous rotation at all divided points. Record the final adjustment results, including the position and weight of the compensating mass.

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

9. The method for high-precision static balancing test bench of shaft transmission equipment according to claim 5, characterized in that: Step 5 includes: Step 5.1: Calculate the unbalance U0 of the static balancing fixture and distribute it to the outer diameter R of the coupling a Theoretical counterweight mass on the coupling is calculated based on the theoretical counterweight mass. a , at the maximum outer diameter R of the coupling a Select an initial counterweight point at any position to add counterweight; Step 5.2: Gently push the coupling to make it rotate freely and observe the actual counterweight M a Dynamic behavior under gravity, determine the actual weight M a Whether it rotates to the lowest point and stops, or whether it oscillates slightly within ±15° of the theoretical lowest point; Step 5.3: With the same weight M a Repeat the free rotation test under the same conditions to verify the consistency of the weight behavior. a The dynamic behavior of multiple tests rotates to the lowest point and stops, or swings slightly within the range of ±15° of the theoretical lowest point, and the static balance state of the coupling is judged to be qualified; if the counterweight M a If the dynamic behavior does not meet the judgment criteria, adjust the mass distribution of the coupling until the balance quality level requirements are achieved.

10. The method for high-precision static balancing test bench of shaft transmission equipment according to claim 9, characterized in that: In step 5.1, the unbalanced value U0 of the static balancing tool is distributed to the outer diameter R of the coupling weight a The theoretical weight mass on the yoke is determined by the following formula: Where: U0 represents the unbalanced amount of the static balancing tool; R a Indicates the outer diameter of the coupling weight; The actual counterweight mass M of the coupling a Used to eliminate the unbalance U0 and achieve an accurate static balance state. Determined by the following formula: M a =M-M′ Where: M represents the minimum counterweight mass added initially; M' represents the distribution of the unbalanced amount U0 of the static balancing fixture to the outer diameter R of the coupling counterweight a The mass of the counterweight on the In step 5.3, the unbalance of the coupling U a Determined by the following formula: U a =M a ×R a Where: M a Indicates the actual counterweight required for the coupling; R a Indicates the maximum outer diameter of the coupling.

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