Fatigue endurance test device and test method for fan bracket

Abstract

The invention discloses a fatigue endurance test device and test method for a fan bracket, and belongs to the technical field of fan bracket test. The device comprises a temperature control box assembly, a test piece mounting bottom 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. The device can simulate the axial force, the radial force and the bending moment of the fan support in actual work, meanwhile, the environment temperature is adjustable and controllable, and a fatigue life test close to an actual working condition is carried out on the fan support. The device can also monitor and record the change data of the radial load, the axial load, the rotating speed and the bearing temperature of the test piece in real time. The structural design is optimized, the service life of the test device is prolonged, and the test reliability of the test device is improved.

Description

Technical Field

[0001] The invention relates to the technical field of fan bracket testing, in particular to a fatigue durability testing device and a testing method for a fan bracket. Background Art

[0002] The fan bracket is an important component used to install and support the mechanical cooling fan blades of automotive internal combustion engines. It has rolling bearings installed inside and is driven by the engine gear train to drive the fan to rotate, thereby dissipating heat and cooling the engine. Fan brackets are widely used and are used in many gasoline, diesel, and gas vehicle engines. During operation, the fan bracket is subject to alternating loads such as the tensioning axial force of the gear train belt, the axial force of the fan rotation, bending moment, and rotational imbalance. At the same time, it is affected by the high temperature environment of the outside world. The product may break or the bearing may fail, causing the cooling fan to separate from the power source, resulting in the loss of the fan cooling system function, causing the engine to overheat and causing the vehicle to shut down; more seriously, it may cause the drive belt to wear and break, and the bearing to fall apart and the fan to fly out, damaging the surrounding parts of the gear train, thereby causing safety accidents. The current tests and verifications for fan brackets in the industry mainly include:

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

[0004] (2) Engine bench tests and road condition tests are mostly performed by engine and vehicle manufacturers. Although they are basically completely applicable to 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 the early failure. At the same time, engine bench tests and road condition tests are extremely expensive and have poor versatility.

[0005] (3) A dedicated test device for the fan bracket is used to simulate the application conditions of the fan bracket. However, the device principles and structures of various manufacturers are different, and the functions they achieve are also different.

[0006] The Chinese patent "A durability test mechanism for engine fan shaft components", publication number CN110095284A, publication date 2019.08.06, discloses a durability test mechanism for engine fan shaft components, including a power assembly, which provides the fan shaft component with the rotational power required for testing; a configuration block, which is assembled on the fan shaft component, and the moment of inertia provided by the configuration block is the same as the moment of inertia provided by the mechanical fan, and the center of mass coincides with the center of mass of the mechanical fan; an axial force loading assembly, which is used to simulate the axial force changes that the fan shaft component is subjected to in actual operation; a radial force loading assembly, which is used to simulate the radial force changes that the fan shaft component is subjected to in actual operation. The above patent has the following disadvantages:

[0007] 1. It is impossible to realize automatic speed and load change (speed, radial force, axial force can be changed) cycle experiment during the experiment;

[0008] 2. It is impossible to simultaneously carry out comparative experiments on the same working conditions of the fan bracket assembly;

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

[0010] 4. It is impossible to set thresholds and realize automatic alarm or shutdown of equipment, and it is impossible to realize autonomous protection after abnormalities or failures occur in experimental equipment.

[0011] The Chinese patent "Dual-axis electrically controlled fan bracket durability test structure", announcement number CN219914834U, announcement date 2023.10.27, discloses a dual-axis electrically controlled fan bracket durability test structure. It includes a base, on which are provided a dual-axis motor, a sliding seat, two sets of driven wheels, a radial loading structure and two sets of axial loading structures. A rotating shaft is respectively provided at both ends of the longitudinal direction of the dual-axis motor, and a driving wheel is provided at the end of the rotating shaft; the sliding seat can be connected to the base in a transverse sliding manner; the two sets of driven wheels are arranged on both sides of the longitudinal direction of the sliding seat, and the driven wheels are fixedly connected to the inner ring of the fan bracket bearing; the radial loading structure is arranged in the longitudinal middle of the sliding seat to apply a horizontal lateral force to the sliding seat; the axial loading structure is arranged 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 disadvantages:

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

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

[0014] 3. The support column of the axial loading mechanism and the test piece have no centering means, which makes it difficult for the two to be concentric when rotating synchronously, resulting in large vibration and wear of the test piece, which in turn causes the contact surface temperature to rise too high, 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, and the sensor will be damaged under high temperature;

[0016] 5. The end bearing of the axial loading mechanism and the driving wheel transmission shaft support bearing do not have a temperature monitoring closed-loop protection function. When these two bearings are damaged, the equipment cannot be automatically shut down to prevent damage to other parts of the mechanism;

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

[0018] 7. The axial and radial loading devices are loaded by electric cylinders without buffer devices to ensure that the force on the test piece increases gradually and prevent the loading speed from being too fast and damaging the test piece;

[0019] 8. Loading device without bending moment adjustment is used to simulate the bending moment generated by the fan on the fan bracket bearing. Summary of the invention

[0020] The purpose of the present invention is to provide a fatigue endurance test device and test method for a fan bracket, aiming to solve the problem of realizing a test device that can not only simulate the actual axial force, radial force and bending moment to which the fan bracket bearing is subjected during rotation, but also realize the adjustable and controllable ambient temperature. In this way, a fatigue life test of the fan bracket bearing that is closer to the actual working conditions can be carried out, and the radial load, axial load, rotation speed and bearing temperature change data of the test piece can be monitored, collected and recorded in real time. At the same time, the structure can be optimized to ensure the improvement of the life of the test device itself and the improvement of the test reliability.

[0021] To achieve the above-mentioned purpose, in a first aspect, the fatigue durability test device for a fan bracket designed by the present invention comprises:

[0022] Temperature control box assembly, used to provide a controlled high temperature environment for the test piece;

[0023] Test piece mounting base plate assembly, used to mount the fan bracket specimen;

[0024] An axial loading mechanism assembly, used to apply a controllable axial load to the test piece;

[0025] A radial loading mechanism assembly, used to apply a controllable radial load to the test piece;

[0026] A bending moment loading mechanism assembly, used to apply a controllable bending moment to the test piece;

[0027] A motor assembly, used to drive the test piece to rotate and provide a variable speed;

[0028] A base assembly, used for installing the above-mentioned components;

[0029] Wherein, the axial loading mechanism assembly, radial loading mechanism assembly and bending moment loading mechanism assembly can all realize constant load loading or variable load cycle loading.

[0030] In some embodiments of the present invention, the test device 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.

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

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

[0033] U-shaped pull plate;

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

[0035] Axial loading mechanism bearing mount;

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

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

[0038] The heat insulation gasket 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 comprises:

[0040] Push rod assembly;

[0041] A rubber gasket mounted on the end of the push rod assembly;

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

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

[0044] In some embodiments of the present invention, the radial loading mechanism assembly includes a transmission belt and a pulley, wherein the transmission belt and the pulley are installed on the test piece and are used to transmit the rotation speed to the test piece and apply a radial load to the test piece.

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

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

[0047] Lever support seat assembly;

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

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

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

[0051] Test piece mounting base plate;

[0052] A positioning sleeve, mounted on the test piece mounting base plate;

[0053] A bottom plate positioning pin, cooperating with the positioning sleeve;

[0054] The bottom plate is fixed on the vertical plate.

[0055] In a second aspect, the present invention further provides a fatigue durability test method for a fan bracket, comprising:

[0056] Install the test piece on the test piece mounting base plate assembly;

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

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

[0059] Set the load parameters of the radial loading mechanism assembly to apply a radial load to the test piece;

[0060] Set the load parameters of the moment loading mechanism assembly to apply a moment to the test piece;

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

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

[0063] End the test 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 a constant load or a variable cyclic load.

[0065] In some embodiments of the present invention, the test method further comprises the steps of:

[0066] A temperature sensor is installed on the test piece to monitor the outer surface temperature of the fan bracket bearing;

[0067] Set the upper limit threshold of bearing temperature. When the temperature exceeds the threshold, the machine will automatically shut down and alarm.

[0068] Compared with the prior art, the present invention has the following beneficial effects:

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

[0070] It realizes the automatic speed-changing and load-changing cycle test, which improves the flexibility and accuracy of the test;

[0071] Able to monitor and record the changing data of radial load, axial load, speed and bearing temperature of the test piece in real time, which is convenient for analysis and evaluation;

[0072] A temperature monitoring and protection mechanism is set up to improve the safety and reliability of the test;

[0073] The structural design of the axial loading mechanism is optimized to solve the vibration and temperature transfer problems;

[0074] The positioning structure is adopted to improve the accuracy and stability of the test piece installation;

[0075] Added moment loading function to simulate actual working conditions more comprehensively;

[0076] The service life of the test device itself and the test reliability are improved.

[0077] The present invention can simulate the axial force, radial force and bending moment that the fan bracket is subjected to in actual operation, and at the same time realize the adjustable and controllable ambient temperature, so as to conduct fatigue life test on the fan bracket close to the actual working conditions. The device can also monitor and record the change data of the radial load, axial load, rotation speed and bearing temperature of the test piece in real time. The present invention optimizes the structural design and improves the service life and test reliability of the test device itself. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] In order to more clearly illustrate the technical solutions of the embodiments disclosed in the present invention, the drawings of the embodiments will be briefly introduced below. These drawings are only used for illustrative purposes and are not intended to limit the protection scope of the present invention.

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

[0080] Figure 2 It 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 is an exploded schematic diagram of the present invention;

[0082] Figure 4 It is a schematic diagram of the axial loading positioning pin hole of the test piece of the present invention. DETAILED DESCRIPTION

[0083] The technical solution of the present invention (including the preferred technical solution) is further described in detail below by means of the accompanying drawings and by listing some optional embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0084] Example 1

[0085] like Figures 1 to 4 As shown, the present embodiment provides a fatigue endurance test device for a fan bracket, comprising the following main components: a temperature control box assembly 1, a test piece mounting base plate assembly 2, an axial loading mechanism assembly 3, a radial loading mechanism assembly 4, a bending moment loading mechanism assembly 5, a motor assembly 6, and a base assembly 7.

[0086] The temperature control box assembly 1 is used to provide a test environment with controllable temperature for the test piece. The assembly includes a box body and a hot air circulation system. The temperature inside the box body can be set and controlled on the upper computer of the device. The hot air circulation system heats the test piece by circulating hot air. The upper computer can close the loop to control the temperature inside the box to be dynamically stable within a certain range of fluctuations. This design makes the test environment closer to the actual working environment of the fan bracket, improving the authenticity and reliability of the test.

[0087] The test piece installation base plate assembly 2 is used to install the fan bracket specimen. The test piece installation base plate assembly 2 includes a test piece installation base plate 201, a positioning sleeve 202, a base plate positioning pin 203 and a fixed vertical plate 204. The test piece installation base plate 201 is installed with a positioning sleeve 202, the positioning sleeve 202 cooperates with the base plate positioning pin 203, and the base plate positioning pin 203 is installed on the fixed vertical plate 204. This design realizes the function of quickly replacing different test pieces and improves the test efficiency. At the same time, the positioning structure ensures the accuracy and repeatability of the test piece installation.

[0088] When replacing 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 inserted into the base plate positioning pin 203, so that positioning and changing can be convenient and fast.

[0089] In some optional embodiments of the present invention, the test piece mounting base plate 201 is a quick-change replaceable component, which mainly serves to install different test pieces. Since different test pieces have different mounting sizes, it is necessary to change the type by replacing this part.

[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 piece plays a role in adjusting the heights of different products.

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

[0092] The axial loading mechanism assembly 3 further 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 mounted on the end of the push rod assembly, wherein the symmetry center 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 invented, and a self-sealing double-row tapered bearing is selected. While being able to withstand the required axial force, it can reduce the excessive inclination angle of the push rod assembly 310 installed on the bearing due to gravity, thereby avoiding excessive vibration of the push rod assembly when rotating.

[0094] The axial loading mechanism bearing 304 will rotate continuously when the test device is running, generating a relatively high temperature, which is transferred to the axial loading mechanism bearing mounting seat 303; the insulation block assembly 305 and the 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, affecting the accuracy or causing damage.

[0095] In some optional embodiments of the present invention, a temperature detection hole is opened at a position on the axial loading mechanism bearing mounting seat 303 that is installed in contact with the axial loading mechanism bearing 304. A temperature sensor can be installed on the detection hole to monitor the operating temperature of the axial loading mechanism bearing 304 in real time. The upper 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 shut down and alarm to prevent the bearing failure from being discovered in time and continued operation to damage the equipment.

[0096] Figure 4 To process the locating holes on the test piece, ensure that the symmetric center of the locating holes is distributed on the rotation center during processing; when the axial loading mechanism is axially loaded, manually insert the locating pin No. 24 into Figure 4 The positioning hole can make the rotation center of the push rod coincide with the rotation center of the test piece, avoiding the 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; the first function is to reduce the impact during loading, and the second function is to buffer the vibration during the operation of the device, both of which can improve the accuracy of force monitoring and avoid damage to the sensor.

[0098] The axial loading mechanism assembly 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 constant load loading or variable load cycle loading can be achieved.

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

[0100] (1) The thermal insulation block assembly and the thermal insulation gasket prevent high temperature from being transferred to the pressure sensor, thus protecting the accuracy and life of the sensor.

[0101] (2) The self-sealing double-row tapered bearing is used as the axial loading mechanism bearing, which reduces the inclination 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, real-time monitoring of the bearing operating temperature is achieved. When the temperature reaches the set threshold, the equipment will shut down 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, avoiding vibration problems.

[0104] (5) The use of rubber gaskets achieves 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 piece. The radial loading mechanism assembly 4 includes a transmission belt 401 and a pulley 402, which are installed on the test piece. This design not only transmits the rotation speed to the test piece, but also applies a radial load to the test piece through the belt tension, simulating the stress conditions in actual work.

[0106] The radial loading mechanism assembly 5 provides radial loading for the device, and the load size can be set and controlled on a separate upper computer of the device, which can realize constant load loading or variable load cycling 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; the first function is to reduce the impact during loading, and the second function is to buffer the vibration during the operation of the device, both of which can improve the accuracy of force monitoring and avoid damage to the sensor.

[0108] The moment loading mechanism assembly 5 is used to apply a controllable bending moment to the test piece. The assembly includes a lever arm 501, a lever arm support seat assembly 502 and a steel wire rope. The lever arm 501 is installed on the test piece and connected to the lever arm support seat assembly 502 through a steel wire rope. When the moment loading mechanism assembly moves along the sliding guide rail 503, the lever arm is pulled by the steel wire rope, thereby applying a bending moment to the test piece. This design realizes the simulation of the bending moment generated by the fan bracket bearing, making the test more comprehensive and realistic.

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

[0110] The moment loading mechanism assembly 6 provides moment loading for the device, and the magnitude of the moment can be set and controlled by the magnitude of the force on a separate upper computer of the device, thereby realizing constant moment loading or variable moment cycling loading.

[0111] The motor assembly 6 is a rotation drive device that provides a constant or variable rotation speed to drive the test piece to rotate. The assembly uses a variable frequency motor to transmit the rotational power to the pulley on the radial loading mechanism assembly through a V-belt 601, and then to the fan bracket pulley, thereby driving the test piece to rotate. This design achieves precise control of the test piece's rotation speed and can simulate speed changes under different working conditions.

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

[0113] Example 2

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

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

[0116] First, select a suitable test piece installation base plate 201, install it on the fixed vertical plate 204, and achieve precise positioning through the base plate positioning pins 203 and the positioning sleeves 202. Then, install the fan bracket to be tested on the test piece installation base plate 201 to ensure that it is firmly installed.

[0117] S2: Set the target temperature of the temperature control box assembly and start the hot air circulation system

[0118] Set the required ambient temperature for the test on the host computer and start the hot air circulation system of the temperature control box assembly 1. The system will automatically control the temperature inside the box so that it fluctuates within the set range.

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

[0120] The axial load parameters are set on the host computer, which can be a constant load or a variable load cycle. The axial loading mechanism component 3 will apply an axial force to the test piece through the push rod component according to the set parameters.

[0121] S4: Set the load parameters of the radial loading mechanism assembly to apply radial load to the test piece

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

[0123] S5: Set the load parameters of the moment loading mechanism assembly to apply a moment to the test piece

[0124] The bending moment parameters are set on the host computer, and the bending moment loading mechanism component 4 applies 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 speed parameters required for the test are set on the host computer, which can be a constant speed or a variable speed cycle. The motor assembly 6 will drive the test piece to rotate according to the set parameters.

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

[0128] During the test, the system will monitor and record the radial load, axial load, speed and bearing temperature of the test piece in real time through various sensors. These 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 be automatically terminated according to a preset time, or automatically stopped according to a set failure condition (such as the bearing temperature exceeds 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 optimization steps:

[0133] 1. Preparation before the test

[0134] Before the test officially begins, the test device is fully inspected and calibrated to ensure that all components are working properly and the sensor data is accurate. The test piece is inspected and measured in detail, and the initial state is recorded.

[0135] 2. Multi-condition cycle test

[0136] Set up multiple different operating condition parameter combinations, such as high temperature and high speed, low temperature and low speed, medium temperature and variable speed, etc., 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 cycle testing.

[0137] 3. Data analysis and processing

[0138] During the test, the system not only records the original data, but also calculates some key indicators in real time, such as the bearing temperature rise rate, load fluctuation range, etc. After the test, the test report can be automatically generated, including statistical analysis of various parameters, trend charts, etc.

[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 signs, and promptly 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] Through the network interface, the test device can be remotely monitored and controlled. Authorized users can check the test status at any time, adjust test parameters, and even remotely stop the test in an emergency.

[0143] 6. Post-test analysis

[0144] After the test, the test piece is inspected and analyzed in detail, including appearance inspection, dimensional measurement, material analysis, etc. These data are combined with the data recorded during the test to comprehensively evaluate the performance and durability of the fan bracket.

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

[0146] In summary, the fatigue durability test device and test method for a fan bracket provided by the present invention can fully simulate the various loads and environmental conditions to which the fan bracket is subjected in actual work, and realize an automated and intelligent test process. Through optimized structural design and advanced control systems, many problems existing in the prior art are solved, and the accuracy, reliability and efficiency of the test are improved. The present invention is not only suitable for durability testing of fan brackets, but can also be extended to other similar rotating component tests, and has broad application prospects.

[0147] Those skilled in the art will readily appreciate that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, combinations, replacements, improvements, etc. made within the spirit and principles of the present invention are included within the protection scope of the present invention.

Claims

1. A fatigue durability test device for a fan bracket, characterized in that: include: Temperature control box assembly, used to provide a controlled high temperature environment for the test piece; Test piece mounting base plate assembly, used to mount the fan bracket specimen; An axial loading mechanism assembly, used to apply a controllable axial load to the test piece; A radial loading mechanism assembly, used to apply a controllable radial load to the test piece; A bending moment loading mechanism assembly, used to apply a controllable bending moment to the test piece; A motor assembly, used to drive the test piece to rotate and provide a variable speed; A base assembly, used for installing the above-mentioned components; Wherein, the axial loading mechanism assembly, radial loading mechanism assembly and bending moment loading mechanism assembly can all realize constant load loading or variable load cycle loading.

2. The fatigue durability testing device for a fan bracket according to claim 1, characterized in that: The test device 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 rotation 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 box assembly includes a box body and a hot air circulation system, and the hot air circulation system is used to circulate and blow hot air inside the box body to heat the test piece.

4. The fatigue durability testing device for a fan bracket according to claim 1, characterized in that: The axial loading mechanism assembly comprises: U-shaped pull plate; A pressure sensor in contact with the U-shaped pull plate; Axial loading mechanism bearing mount; An axial loading mechanism bearing is mounted in the axial loading mechanism bearing mounting seat; A heat insulation block assembly is installed between the axial loading mechanism bearing mounting seat and the U-shaped pull plate; The heat insulation gasket is installed between the heat insulation block assembly and the U-shaped pull plate.

5. The fatigue durability testing device for a fan bracket according to claim 4, characterized in that: The axial loading mechanism assembly further comprises: Push rod assembly; A rubber gasket mounted on the end of the push rod assembly; An axial thrust head is mounted on the rubber gasket; The axial positioning pin is installed on the axial thrust head, and its symmetry center coincides with the center of the push rod.

6. The fatigue durability testing device for a fan bracket according to claim 1, characterized in that: The radial loading mechanism assembly comprises a transmission belt and a pulley, wherein the transmission belt and the pulley are installed on the test piece and are used to transmit the rotation speed to the test piece and apply a radial load to the test piece.

7. The fatigue durability testing device for a fan bracket according to claim 1, characterized in that: The moment loading mechanism assembly comprises: The lever arm is installed on the test piece; Lever support seat assembly; A steel wire rope connects the lever arm support seat assembly and the moment loading mechanism assembly.

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

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

10. The fatigue durability test method for a fan bracket according to claim 8 or 9, characterized in that: The test method also includes the steps of: A temperature sensor is installed on the test piece to monitor the outer surface temperature of the fan bracket bearing; Set the upper limit threshold of bearing temperature. When the temperature exceeds the threshold, the machine will automatically shut down and alarm.

Images