A fatigue durability testing apparatus and method for a fan bracket

Abstract

This invention discloses a fatigue durability testing device and method for fan brackets, belonging to the field of fan bracket testing technology. The device includes: a temperature control box assembly, a test piece mounting base plate assembly, an axial loading mechanism assembly, a base assembly, a radial loading mechanism assembly, a bending moment loading mechanism assembly, and a motor assembly. This invention can simulate the axial force, radial force, and bending moment experienced by a fan bracket during actual operation, while simultaneously achieving adjustable and controllable ambient temperature, enabling fatigue life testing of the fan bracket under near-real-world conditions. The device can also monitor and record real-time changes in radial load, axial load, rotational speed, and bearing temperature of the test piece. This invention optimizes the structural design, improving the service life and testing reliability of the testing device itself.

Description

Technical Field

[0001] This invention relates to the field of fan bracket testing technology, specifically a fatigue durability testing device and method for fan brackets. Background Technology

[0002] Fan brackets are crucial components for mounting and supporting the blades of mechanical cooling fans in automotive internal combustion engines. They contain rolling bearings and are driven by the engine's drivetrain to rotate the fan, thus cooling the engine. Fan brackets are widely used in numerous gasoline, diesel, and natural gas vehicle engines. During operation, fan brackets are subjected to alternating loads such as belt tension, axial force from fan rotation, bending moment, and rotational imbalance. They are also affected by high external temperatures. This can lead to component breakage or bearing failure, causing the cooling fan to disconnect from the power source, resulting in the loss of the cooling system's functionality, engine overheating, and vehicle shutdown. More seriously, it can cause the drive belt to wear and break, and the bearings to disintegrate, with the fan flying out and damaging surrounding components, potentially causing a safety accident. Currently, industry testing and verification of fan brackets mainly include:

[0003] (1) Rolling bearing unit test: Although there are relatively mature bearing fatigue durability test equipment that can verify the fatigue life of bearing units, the disadvantage of bearing unit test for fan bracket products is that it cannot truly verify the assembly relationship and load conditions (point of action and direction of action) of fan bracket bearings.

[0004] (2) Engine bench tests and road tests are mostly done by engine and vehicle manufacturers. Although they are almost identical to applications for fan bracket verification, it is difficult to monitor the temperature and vibration parameters of the product in real time during the test. Once the product fails, it is difficult to find the cause of early failure. At the same time, engine bench tests and road tests are extremely expensive and have poor versatility.

[0005] (3) A test device for fan brackets is used to simulate the application conditions of fan brackets. However, the devices of different manufacturers have different principles, structures and functions.

[0006] Chinese patent "A Durability Testing Mechanism for an Engine Fan Shaft Component", publication number CN110095284A, publication date August 6, 2019, discloses a durability testing mechanism for an engine fan shaft component. The mechanism includes a power assembly that provides the rotational power required for testing the fan shaft component; a mounting block that is assembled onto the fan shaft component, the mounting block providing the same moment of inertia as the mechanical fan, and its center of mass coinciding with the mechanical fan's center of mass; an axial force loading assembly that simulates the axial force changes experienced by the fan shaft component during actual operation; and a radial force loading assembly that simulates the radial force changes experienced by the fan shaft component during actual operation. The above patent has the following drawbacks:

[0007] 1. It is impossible to achieve automatic speed and load variation (variable speed, radial force, and axial force) cyclic experiments during the experiment;

[0008] 2. It is not possible to conduct comparative experiments under the same working conditions for the fan bracket assembly simultaneously;

[0009] 3. Unable to automatically collect experimental parameters or data during the experiment;

[0010] 4. It is impossible to set thresholds and enable automatic alarms or shutdowns of the equipment, and it is impossible to achieve autonomous protection after the experimental equipment malfunctions or breaks down.

[0011] Chinese patent "Dual-Axis Electrically Controlled Fan Bracket Durability Test Structure", publication number CN219914834U, publication date October 27, 2023, discloses a dual-axis electrically controlled fan bracket durability test structure. It includes a base, on which a dual-axis motor, a sliding seat, two sets of driven wheels, a radial loading structure, and two sets of axial loading structures are mounted. The dual-axis motor has a rotating shaft at each of its longitudinal ends, with a driving wheel at the end of each shaft. The sliding seat is slidably connected to the base. The two sets of driven wheels are located on both sides of the sliding seat's longitudinal direction and are fixedly connected to the inner ring of the fan bracket bearing. The radial loading structure is located in the middle of the sliding seat's longitudinal direction to apply a horizontal lateral force to the sliding seat. The axial loading structure is located on the sliding seat to apply a horizontal longitudinal force to the inner ring of the fan bracket bearing. The above patent has the following drawbacks:

[0012] 1. It does not have the function of adjusting the test environment temperature;

[0013] 2. The axial loading mechanism and the test piece have no positioning structure, and the end face bearing is used. The loading support column is affected by gravity, resulting in a large rotation angle of the shaft.

[0014] 3. The support column of the axial loading mechanism and the test piece lack a centering mechanism, which makes it difficult for them to be concentric when rotating synchronously, resulting in large vibrations, wear on the test piece, and excessive temperature rise at the contact surface, affecting the reliability of the test temperature of the test piece.

[0015] 4. There is no heat insulation device between the pressure sensor and the bearing, which will damage the sensor at high temperatures;

[0016] 5. The end face bearings of the axial loading mechanism and the support bearings of the drive wheel transmission shaft lack temperature monitoring closed-loop protection. When these two bearings are damaged, the equipment cannot automatically stop to prevent damage to other parts of the mechanism.

[0017] 6. The drive wheel has a cantilever structure, and its drive shaft support bearing is subjected to eccentric load, making the bearing prone to uneven wear and failure.

[0018] 7. The axial and radial loading devices use electric cylinders for loading without buffering devices to ensure that the force on the test specimen increases gradually and to prevent the loading speed from being too fast and damaging the test specimen.

[0019] 8. No bending moment adjustment loading device, simulating the bending moment generated by the fan on the fan bracket bearing. Summary of the Invention

[0020] The purpose of this invention is to provide a fatigue durability testing device and method for fan brackets, aiming to solve the problem of creating a testing device that can simulate the actual axial force, radial force, and bending moment experienced by fan bracket bearings during rotational operation, while also achieving adjustable and controllable ambient temperature. This allows for fatigue life testing of fan bracket bearings under conditions closer to actual operation, and real-time monitoring, acquisition, and recording of changes in radial load, axial load, rotational speed, and bearing temperature. Simultaneously, the structure can be optimized to ensure improved lifespan of the testing device itself and enhanced testing reliability.

[0021] To achieve the above objectives, in a first aspect, the fatigue durability testing apparatus for a fan bracket designed according to the present invention includes:

[0022] Temperature control chamber assembly, used to provide a controlled high-temperature environment for test specimens;

[0023] The test specimen mounting base plate assembly is used to mount the fan bracket specimen;

[0024] An axial loading mechanism assembly for applying a controlled axial load to a test specimen;

[0025] Radial loading mechanism assembly for applying controlled radial loads to the test specimen;

[0026] A bending moment loading mechanism assembly for applying a controlled bending moment to a test specimen;

[0027] Electric motor assembly for driving the test specimen to rotate and providing variable speed;

[0028] Base assembly, used to mount the above components;

[0029] The axial loading mechanism assembly, radial loading mechanism assembly, and bending moment loading mechanism assembly can all achieve constant load loading or cyclic load loading of varying loads.

[0030] In some embodiments of the present invention, the test apparatus further includes a host computer for controlling the temperature of the temperature control box assembly, the load of the axial loading mechanism assembly, the load of the radial loading mechanism assembly, the bending moment of the bending moment loading mechanism assembly, and the rotational speed of the motor assembly.

[0031] In some embodiments of the present invention, the temperature control chamber assembly includes a chamber and a hot air circulation system, the hot air circulation system being used to circulate hot air inside the chamber to heat the test specimen.

[0032] In some embodiments of the present invention, the axial loading mechanism assembly includes:

[0033] U-shaped pull plate;

[0034] The pressure sensor is in contact with the U-shaped pull plate;

[0035] Axial loading mechanism bearing mounting base;

[0036] An axial loading mechanism bearing is installed in the axial loading mechanism bearing mounting seat;

[0037] The heat insulation block assembly is installed between the bearing mounting seat of the axial loading mechanism and the U-shaped pull plate;

[0038] A heat insulation pad is installed between the heat insulation block assembly and the U-shaped pull plate.

[0039] In some embodiments of the present invention, the axial loading mechanism assembly further includes:

[0040] push rod assembly;

[0041] A rubber washer is installed at the end of the push rod assembly;

[0042] An axial thrust head is mounted on the rubber washer;

[0043] An axial locating pin is installed on the axial thrust head, and its center of symmetry coincides with the center of the push rod.

[0044] In some embodiments of the present invention, the radial loading mechanism assembly includes a drive belt and a pulley mounted on the test specimen for transmitting rotational speed to the test specimen and applying radial load to the test specimen.

[0045] In some embodiments of the present invention, the bending moment loading mechanism assembly includes:

[0046] The lever arm is mounted on the test piece;

[0047] Lever arm support assembly;

[0048] A steel wire rope connects the lever arm support assembly and the moment loading mechanism assembly.

[0049] In some embodiments of the present invention, the motor assembly is a variable frequency motor, whose output pulley transmits rotational power to the pulley on the radial loading mechanism assembly via a V-belt, and then to the fan bracket pulley, thereby driving the test piece to rotate.

[0050] In some embodiments of the present invention, the test specimen mounting base plate assembly includes:

[0051] Test specimen mounting base plate;

[0052] The positioning sleeve is installed on the mounting base plate of the test piece;

[0053] The base plate positioning pin mates with the positioning sleeve.

[0054] The base plate is fixed on the upright plate, and the positioning pin of the base plate is installed on the fixed upright plate.

[0055] Secondly, the present invention also provides a fatigue durability testing method for a fan bracket, comprising:

[0056] Install the test specimen onto the test specimen mounting base plate assembly;

[0057] Set the target temperature for the temperature control box components and start the hot air circulation system;

[0058] Set the load parameters of the axial loading mechanism component and apply an axial load to the test piece;

[0059] Set the load parameters of the radial loading mechanism component and apply a radial load to the test specimen;

[0060] Set the load parameters of the bending moment loading mechanism components and apply a bending moment to the test specimen;

[0061] Set the rotational speed parameters of the motor assembly to drive the test piece to rotate;

[0062] Real-time monitoring and recording of radial load, axial load, rotational speed, and bearing temperature data during the test;

[0063] The test is terminated according to the preset test time or failure condition.

[0064] In some embodiments of the present invention, the axial load, radial load, and bending moment load may be constant loads or variable cyclic loads.

[0065] In some embodiments of the present invention, the testing method further includes the step of:

[0066] Temperature sensors were installed on the test specimen to monitor the temperature of the outer surface of the fan bracket bearing.

[0067] Set an upper limit threshold for bearing temperature. When the temperature exceeds the threshold, the machine will automatically stop and trigger an alarm.

[0068] Compared with the prior art, the beneficial effects of the present invention are:

[0069] It can simulate the axial force, radial force and bending moment that the fan bracket is subjected to in actual work, and at the same time realize the adjustable and controllable ambient temperature, and conduct fatigue life test on the fan bracket under near actual working conditions.

[0070] Automatic variable speed and variable load cyclic testing was achieved, improving the flexibility and accuracy of the test;

[0071] It can monitor and record changes in radial load, axial load, rotational speed, and bearing temperature of the test specimen in real time, facilitating analysis and evaluation;

[0072] Temperature monitoring and protection mechanisms have been implemented to improve the safety and reliability of the experiment.

[0073] The structural design of the axial loading mechanism was optimized, and the problems of vibration and temperature transmission were solved.

[0074] The use of a positioning structure improves the accuracy and stability of the test piece installation;

[0075] A bending moment loading function has been added to more comprehensively simulate actual working conditions;

[0076] This improves the service life of the testing equipment and the reliability of the test.

[0077] This invention can simulate the axial force, radial force, and bending moment experienced by a fan bracket during actual operation, while simultaneously enabling adjustable and controllable ambient temperature, allowing for fatigue life testing of the fan bracket under near-real-world conditions. The device can also monitor and record real-time changes in radial load, axial load, rotational speed, and bearing temperature of the test specimen. This invention optimizes the structural design, improving the service life and reliability of the testing device itself. Attached Figure Description

[0078] To more clearly illustrate the technical solutions of the embodiments disclosed in this invention, the accompanying drawings of the embodiments will be briefly described below. These drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention.

[0079] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0080] Figure 2 This is a schematic diagram of the structure of the present invention after removing the temperature control box assembly and the base assembly;

[0081] Figure 3 This is an exploded view of the present invention;

[0082] Figure 4 This is a schematic diagram of the axial loading positioning pin hole of the test piece of the present invention. Detailed Implementation

[0083] The technical solutions (including preferred technical solutions) of the present invention will be further described in detail below with reference to the accompanying drawings and by way of listing some optional embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0084] Example 1

[0085] like Figures 1 to 4 As shown in the figure, the fatigue durability testing device for a fan bracket provided in this embodiment includes the following main components: temperature control box assembly 1, test piece mounting base plate assembly 2, axial loading mechanism assembly 3, radial loading mechanism assembly 4, bending moment loading mechanism assembly 5, motor assembly 6, and base assembly 7.

[0086] The temperature control chamber assembly 1 provides a controllable temperature testing environment for the test specimens. This assembly includes the chamber housing and a hot air circulation system. The internal temperature of the chamber can be set and controlled via the host computer of the device. The hot air circulation system heats the test specimens by circulating hot air. The host computer can implement closed-loop control to dynamically stabilize the internal temperature within a certain range of fluctuations. This design makes the testing environment closer to the actual working environment of the fan bracket, improving the realism and reliability of the test.

[0087] The test specimen mounting base plate assembly 2 is used to mount the fan bracket specimen. The test specimen mounting base plate assembly 2 includes a test specimen mounting base plate 201, a positioning sleeve 202, a base plate positioning pin 203, and a fixed upright plate 204. The positioning sleeve 202 is mounted on the test specimen mounting base plate 201, and the positioning sleeve 202 cooperates with the base plate positioning pin 203, which is mounted on the fixed upright plate 204. This design enables quick replacement of different test specimens, improving testing efficiency. Simultaneously, the positioning structure ensures the accuracy and repeatability of the test specimen installation.

[0088] When changing different test pieces, the test piece mounting base plate 201 needs to be replaced. Therefore, a positioning sleeve 202 is installed on each test piece mounting base plate 201, and the positioning sleeve is then put into the positioning pin 203 on the base plate, which makes it convenient and quick to position and change the type.

[0089] In some optional embodiments of the present invention, the test specimen mounting base plate 201 is a quick-change replaceable component, which mainly serves to install different test specimens. Since the installation dimensions of different test specimens are different, it is necessary to change the type by replacing this component.

[0090] The test piece mounting base plate assembly 2 also includes a height adjustment pad 205. Since different products have different heights, but the position of the radial loading mechanism remains fixed, this pad serves to adjust the height of different products.

[0091] The axial loading mechanism assembly 3 is used to apply a controllable axial load to the test specimen. The axial loading mechanism assembly 3 includes a U-shaped pull plate 301, a pressure sensor 302, an axial loading mechanism bearing mounting base 303, an axial loading mechanism bearing 304, a heat insulation block assembly 305, and a heat insulation gasket 306. The U-shaped pull plate 301 contacts the pressure sensor 302, the axial loading mechanism bearing 304 is mounted within the bearing mounting base 303, and the heat insulation block assembly 305 and the heat insulation gasket 306 are installed between the bearing mounting base 303 and the U-shaped pull plate 301.

[0092] The axial loading mechanism assembly 3 also includes a push rod assembly 307, a rubber washer 308, an axial thrust head 309, and an axial positioning pin 310. The rubber washer 308, the axial thrust head 309, and the axial positioning pin 310 are sequentially installed at the end of the push rod assembly, wherein the center of symmetry of the axial positioning pin 310 coincides with the center of the push rod.

[0093] In some optional embodiments of the present invention, the axial loading mechanism bearing 304 is a self-sealing double-row tapered bearing, which can withstand the required axial force while reducing the excessive tilt angle of the push rod assembly 310 mounted on the bearing due to gravity, and avoids excessive vibration when the push rod assembly rotates.

[0094] The axial loading mechanism bearing 304 rotates continuously during the operation of the test device, generating a high temperature that is transferred to the axial loading mechanism bearing mounting seat 303. The heat insulation block assembly 305 and the heat insulation gasket 306 are installed between the axial loading mechanism bearing mounting seat 303 and the U-shaped pull plate 301 to prevent the temperature from being transferred to the U-shaped pull plate 301 and then to the pressure sensor 302, which could affect the accuracy or cause damage.

[0095] In some optional embodiments of the present invention, a temperature detection hole is provided on the bearing mounting base 303 of the axial loading mechanism and at the position where it contacts the bearing 304 of the axial loading mechanism. A temperature sensor can be installed on the detection hole to monitor the operating temperature of the bearing 304 of the axial loading mechanism in real time. The host computer of the present invention can set an upper limit on the operating temperature of the bearing. When the operating temperature of the bearing reaches the set threshold, the equipment will stop and alarm to prevent the bearing failure from going undetected and causing damage to the equipment due to continuous operation.

[0096] Figure 4 To illustrate the machining of positioning holes on the test piece, ensure that the symmetrical centers of the positioning holes are located on the center of rotation during machining; when the axial loading mechanism applies axial loading, manually insert the positioning pin (number 24) into... Figure 4 The positioning hole allows the rotation center of the push rod to coincide with the rotation center of the test piece, thus avoiding vibration caused by the misalignment of the two centers;

[0097] In some optional embodiments of the present invention, the axial loading mechanism assembly 3 further includes an axial loading buffer spring 311. The axial loading buffer spring 311 is placed between the loading cylinder and the force sensor; its functions are twofold: first, to reduce the impact during loading; and second, to buffer the vibration during equipment operation, both of which improve the accuracy of force monitoring and prevent damage to the sensor.

[0098] The axial loading mechanism component 3 provides axial loading for the test device. The load size can be set and controlled on a separate host computer of the device, and can realize constant load loading or variable load cyclic loading.

[0099] The axial loading mechanism component 3 designed in this way solves the following problems:

[0100] (1) The heat insulation block assembly and heat insulation pad prevent high temperature from being transmitted to the pressure sensor, thus protecting the accuracy and lifespan of the sensor.

[0101] (2) The self-sealing double-row tapered bearing is used as the bearing of the axial loading mechanism, which reduces the tilt angle of the push rod assembly caused by gravity and avoids excessive vibration during rotation.

[0102] (3) By opening a temperature detection hole on the bearing mounting seat, the bearing operating temperature can be monitored in real time. When the temperature reaches the set threshold, the equipment will stop and alarm to prevent equipment damage caused by bearing failure.

[0103] (4) The positioning pin and the positioning hole on the test piece are used to ensure that the rotation center of the push rod coincides with the rotation center of the test piece, thus avoiding vibration problems.

[0104] (5) The use of rubber gaskets enables flexible contact between the indenter and the test piece, reduces the impact during rotation, and improves the stability of the test.

[0105] The radial loading mechanism assembly 4 is used to apply a controllable radial load to the test specimen. The radial loading mechanism assembly 4 includes a drive belt 401 and a pulley 402, which are mounted on the test specimen. This design not only transmits rotational speed to the test specimen but also applies a radial load to the test specimen through belt tension, simulating the stress conditions in actual operation.

[0106] The radial loading mechanism component 5 provides radial loading for the device. The load size can be set and controlled on a separate host computer of the device, and can realize constant load loading or variable load cyclic loading.

[0107] In some optional embodiments of the present invention, the radial loading mechanism assembly 5 further includes a radial loading buffer spring 71. The radial loading buffer spring 71 is placed between the loading cylinder and the force sensor; its functions are twofold: first, to reduce the impact during loading; and second, to buffer the vibration during equipment operation, both of which improve the accuracy of force monitoring and prevent damage to the sensor.

[0108] The bending moment loading mechanism assembly 5 is used to apply a controllable bending moment to the test specimen. This assembly includes a lever arm 501, a lever arm support assembly 502, and a wire rope. The lever arm 501 is mounted on the test specimen and connected to the lever arm support assembly 502 via the wire rope. When the bending moment loading mechanism assembly moves along the sliding guide rail 503, it pulls the lever arm via the wire rope, thereby applying a bending moment to the test specimen. This design simulates the bending moment generated by the fan bracket bearing, making the experiment more comprehensive and realistic.

[0109] The moment loading mechanism component moves backward along the sliding guide rail 503, the wire rope is stretched, and then the power arm support assembly moves along the sliding guide rail, thereby causing the power arm to bend, and the test piece obtains a bending moment (eccentric load).

[0110] The bending moment loading mechanism component 6 provides bending moment loading for the device. The magnitude of the bending moment can be set and controlled by the magnitude of the force on a separate host computer of the device, which can realize constant bending moment loading or variable bending moment cyclic loading.

[0111] The electric motor assembly 6 serves as a rotary drive device, providing a continuous or variable rotational speed to drive the test specimen's rotation. This assembly employs a variable frequency motor, which transmits rotational power via a V-belt 601 to the pulley on the radial loading mechanism assembly, and then to the fan bracket pulley, thereby driving the test specimen's rotation. This design enables precise control of the test specimen's rotational speed, simulating speed variations under different operating conditions.

[0112] The base assembly 7 serves as the mounting platform for the entire device, providing stable support for other components.

[0113] Example 2

[0114] Based on the apparatus of Embodiment 1, the present invention also provides a fatigue durability testing method for a fan bracket, comprising the following steps:

[0115] S1: Install test piece 8 onto the test piece mounting base plate assembly.

[0116] First, select a suitable test specimen mounting base plate 201 and install it on the fixed upright plate 204, achieving precise positioning through the base plate positioning pins 203 and positioning sleeves 202. Then, install the fan bracket to be tested onto the test specimen mounting base plate 201, ensuring a secure installation.

[0117] S2: Set the target temperature for the temperature control box components and start the hot air circulation system.

[0118] Set the required ambient temperature for the experiment on the host computer and start the hot air circulation system of temperature control box component 1. The system will automatically control the temperature inside the box to fluctuate within the set range.

[0119] S3: Set the load parameters of the axial loading mechanism assembly and apply an axial load to the test piece.

[0120] The axial load parameters are set on the host computer; these can be a constant load or a varying load cycle. The axial loading mechanism assembly 3 applies axial force to the test piece via the push rod assembly according to the set parameters.

[0121] S4: Set the load parameters of the radial loading mechanism assembly and apply a radial load to the test specimen.

[0122] The radial load parameters are set on the host computer, and the radial loading mechanism component 4 applies radial force to the test piece by adjusting the belt tension.

[0123] S5: Set the load parameters of the bending moment loading mechanism component and apply a bending moment to the test specimen.

[0124] The bending moment parameters are set on the host computer, and the bending moment loading mechanism component 4 applies a bending moment to the test piece by adjusting the tension of the wire rope.

[0125] S6: Set the speed parameters of the motor assembly to drive the test piece to rotate.

[0126] The required rotational speed parameters for the test are set on the host computer; this can be a constant speed or a cyclical, varying speed. The motor assembly 6 will then drive the test piece to rotate according to the set parameters.

[0127] S7: Real-time monitoring and recording of radial load, axial load, rotational speed, and bearing temperature data during the test.

[0128] During the test, the system monitors and records real-time changes in radial load, axial load, rotational speed, and bearing temperature of the test specimen using various sensors. This data can be used for subsequent analysis and evaluation.

[0129] S8: End the test according to the preset test time or failure condition.

[0130] The test can automatically end after a preset time or automatically stop based on a set failure condition (such as the bearing temperature exceeding a threshold). After the test, the system will save all recorded data for analysis.

[0131] Example 3

[0132] Based on Example 2, the test method of the present invention may further include the following optimized steps:

[0133] 1. Preparations before the experiment

[0134] Before the formal start of the test, a comprehensive inspection and calibration of the test equipment was conducted to ensure that all components were functioning properly and that the sensor data was accurate. A detailed visual inspection and dimensional measurement of the test specimen were performed, and the initial state was recorded.

[0135] 2. Multi-condition cyclic test

[0136] Multiple different combinations of operating parameters can be set, such as high temperature and high speed, low temperature and low speed, and medium temperature and variable speed, to simulate the performance of the fan bracket under different environments and working conditions. The system can automatically switch between different operating conditions in a preset sequence to achieve long-term cyclic testing.

[0137] 3. Data Analysis and Processing

[0138] During the test, the system not only records the raw data but also calculates key indicators in real time, such as the bearing temperature rise rate and load fluctuation range. After the test, it automatically generates a test report, including statistical analysis of various parameters and trend charts.

[0139] 4. Fault diagnosis and early warning

[0140] Based on historical data and experience, a fault diagnosis model is established. During the test, the system can analyze data in real time, identify potential fault symptoms, and promptly issue an alarm when the warning threshold is reached to prevent equipment damage caused by sudden failure of the test piece.

[0141] 5. Remote monitoring and control

[0142] Remote monitoring and control of the testing equipment can be achieved through a network interface. Authorized users can view the test status, adjust test parameters, and even remotely stop the test in an emergency.

[0143] 6. Post-experiment analysis

[0144] After the test, the test pieces underwent a detailed inspection and analysis, including visual inspection, dimensional measurement, and material analysis. These data were then combined with data recorded during the test to comprehensively evaluate the performance and durability of the fan bracket.

[0145] Through these optimization steps, the testing method of the present invention can not only more comprehensively simulate the actual working conditions of the fan bracket, but also provide richer data support, providing a strong basis for product design and quality improvement.

[0146] In summary, the fatigue durability testing device and method for fan brackets provided by this invention can comprehensively simulate various loads and environmental conditions experienced by fan brackets in actual operation, achieving an automated and intelligent testing process. Through optimized structural design and an advanced control system, many problems existing in the prior art are solved, improving the accuracy, reliability, and efficiency of the test. This invention is not only applicable to the durability testing of fan brackets but can also be extended to the testing of other similar rotating components, showing broad application prospects.

[0147] It will be readily understood by those skilled in the art that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, combinations, substitutions, improvements, etc., made under the spirit and principles of the present invention are included within the protection scope of the present invention.

Claims

1. A fatigue durability testing device for a fan bracket, characterized in that, include: Temperature control chamber assembly, used to provide a controlled high-temperature environment for test specimens; The test specimen mounting base plate assembly is used to mount the fan bracket specimen; An axial loading mechanism assembly for applying a controlled axial load to a test specimen; Radial loading mechanism assembly for applying controlled radial loads to the test specimen; A bending moment loading mechanism assembly for applying a controlled bending moment to a test specimen; Electric motor assembly for driving the test specimen to rotate and providing variable speed; Base assembly, used to mount the above components; The axial loading mechanism assembly, radial loading mechanism assembly, and bending moment loading mechanism assembly can all achieve constant load loading or cyclic load loading of varying loads. The axial loading mechanism assembly includes: U-shaped pull plate; The pressure sensor is in contact with the U-shaped pull plate; Axial loading mechanism bearing mounting base; An axial loading mechanism bearing is installed in the axial loading mechanism bearing mounting seat; The heat insulation block assembly is installed between the bearing mounting seat of the axial loading mechanism and the U-shaped pull plate; A heat insulation pad is installed between the heat insulation block assembly and the U-shaped pull plate.

2. The fatigue durability testing device for a fan bracket according to claim 1, characterized in that: The test apparatus also includes a host computer for controlling the temperature of the temperature control box assembly, the load of the axial loading mechanism assembly, the load of the radial loading mechanism assembly, the bending moment of the bending moment loading mechanism assembly, and the rotational speed of the motor assembly.

3. The fatigue durability testing device for a fan bracket according to claim 1, characterized in that: The temperature control chamber assembly includes a chamber body and a hot air circulation system, which is used to circulate hot air inside the chamber body to heat the test specimen.

4. The fatigue durability testing device for a fan bracket according to claim 1, characterized in that: The axial loading mechanism assembly also includes: push rod assembly; A rubber washer is installed at the end of the push rod assembly; An axial thrust head is mounted on the rubber washer; An axial locating pin is installed on the axial thrust head, and its center of symmetry coincides with the center of the push rod.

5. The fatigue durability testing device for a fan bracket according to claim 1, characterized in that: The radial loading mechanism assembly includes a drive belt and pulleys mounted on the test specimen to transmit rotational speed to the test specimen and apply radial load to the test specimen.

6. The fatigue durability testing apparatus for a fan bracket according to claim 1, characterized in that: The bending moment loading mechanism component includes: The lever arm is mounted on the test piece; Lever arm support assembly; A steel wire rope connects the lever arm support assembly and the moment loading mechanism assembly.

7. A test method applied to the fatigue durability testing apparatus for a fan bracket according to any one of claims 1 to 6, comprising: Install the test specimen onto the test specimen mounting base plate assembly; Set the target temperature for the temperature control box components and start the hot air circulation system; Set the load parameters of the axial loading mechanism component and apply an axial load to the test piece; Set the load parameters of the radial loading mechanism component and apply a radial load to the test specimen; Set the load parameters of the bending moment loading mechanism components and apply a bending moment to the test specimen; Set the rotational speed parameters of the motor assembly to drive the test piece to rotate; Real-time monitoring and recording of radial load, axial load, rotational speed, and bearing temperature data during the test; The test is terminated according to the preset test time or failure condition.

8. The fatigue durability test method for a fan bracket according to claim 7, characterized in that: The axial load, radial load, and bending moment load can be constant loads or variable cyclic loads.

9. The fatigue durability test method for a fan bracket according to claim 7 or 8, characterized in that, The test method also includes the following steps: Temperature sensors were installed on the test specimen to monitor the temperature of the outer surface of the fan bracket bearing. Set an upper limit threshold for bearing temperature. When the temperature exceeds the threshold, the machine will automatically stop and trigger an alarm.

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