A heat dissipation fan oil film detection device

Abstract

The application provides a heat dissipation fan oil film detection device, which comprises a mounting bottom plate, a rotating support, a rotating frame capable of rotating around the Y axis, a clamping device, a conductive brush assembly, a microphone, a conductive probe assembly, a temperature sensor, an acceleration gauge and a wiring rack. The conductive brush assembly is driven to lift by a Z-direction adjusting device, so that the conductive brush contacts the end surface of the fan blade shaft; the conductive probe contacts the metal at the bottom of the fan; the microphone, the acceleration gauge and the temperature sensor respectively collect sound, vibration and temperature signals. The rotating frame can drive the fan to rotate to different spatial postures for multi-directional detection. The application synchronously collects multi-dimensional signals such as electrical characteristics, vibration, noise and temperature through one-time clamping, realizes comprehensive evaluation of the oil film state, effectively improves the detection accuracy and efficiency, and especially fully exposes the hidden abnormalities of the oil film under different postures through dynamic rotation detection.

Description

Technical Field

[0001] This invention relates to the field of fan testing device technology, and in particular to a cooling fan oil film testing device. Background Technology

[0002] Cooling fans are widely used in electronic devices such as servers, personal computers, and communication equipment. Their reliability directly affects the cooling effect and lifespan of these devices. Oil-impregnated bearings are one of the most common types of bearings in cooling fans. The state of the oil film formed between the bearing and the shaft during fan operation directly affects the fan's sound quality and lifespan. When the oil film thickness is insufficient or the lubricating oil deteriorates, dry friction or boundary lubrication can easily occur between the bearing and the shaft, leading to abnormal noise and increased vibration from the fan, and in severe cases, even premature bearing failure. Therefore, accurate assessment of the oil film condition is of great importance in the production and testing of cooling fans.

[0003] Currently, several technical solutions exist for detecting bearing oil film conditions. For example, some solutions apply a low DC voltage to the bearing and diagnose the oil film condition based on the measured voltage; others model the oil film as a capacitor, applying an AC voltage to the bearing non-contactly and estimating the oil film condition based on the measured electrostatic capacitance. Furthermore, there are solutions using electrochemical impedance spectroscopy to measure the oil content on the metal surface, and solutions that assess the lubrication condition of oil-impregnated bearings by measuring the rotor's free-spinning time and combining it with a judgment model.

[0004] Most existing solutions infer oil film status indirectly from a single physical quantity (such as resistance, capacitance, or spin time), lacking comprehensive acquisition and analysis of multiple key parameters during fan operation. In reality, changes in oil film status are reflected simultaneously in multiple dimensions, including the fan's electrical characteristics, vibration signals, acoustic features, and temperature changes. A single indicator is insufficient for a comprehensive and accurate assessment of the true condition of the oil film. Currently, there is no dedicated testing device that integrates multiple functions such as fan blade shaft end-face contact detection, bottom metal contact detection, vibration detection, sound detection, and temperature detection. On cooling fan production lines, different testing items are often performed at different workstations, resulting in low efficiency. Furthermore, clamping errors and variations in condition between different workstations can affect the consistency and reliability of the test results. Summary of the Invention

[0005] The purpose of this invention is to provide a cooling fan oil film detection device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A cooling fan oil film detection device, comprising:

[0008] Install base plate;

[0009] The rotating bracket is vertically fixed on the mounting base plate;

[0010] A rotating frame is rotatably connected to a rotating support about the Y-axis; the middle part of the upper surface of the rotating frame is used to place the cooling fan to be tested.

[0011] A clamping device, mounted on a rotating frame, is used to clamp and fix the cooling fan under test;

[0012] A conductive brush assembly is mounted above the rotating frame. The conductive brush assembly includes a Z-axis adjustment device, a connecting frame, a first insulating sleeve, a conductive post, and a conductive brush. The Z-axis adjustment device is mounted on the rotating frame. One end of the connecting frame is fixed to the output end of the Z-axis adjustment device and its height is adjusted by the Z-axis adjustment device. The conductive post is mounted on the other end of the connecting frame through the first insulating sleeve. The conductive brush is fixed to the lower end of the conductive post. The conductive brush moves up and down with the connecting frame under the drive of the Z-axis adjustment device to abut or disengage from the end face of the fan blade shaft of the cooling fan under test.

[0013] A microphone, with its pickup port facing upwards and fixed on a rotating frame, has its pickup port close to or in contact with the bottom surface of the cooling fan under test.

[0014] A conductive probe assembly includes a probe base, a second insulating sleeve, and a conductive probe; the probe base is fixed to the bottom of a rotating frame; the conductive probe is fixed to the probe base by the second insulating sleeve; the conductive probe is located at the center of the rotating frame; when the cooling fan under test is clamped on the rotating frame, the conductive probe contacts the bottom metal material of the bearing sleeve of the cooling fan under test or the bottom metal material of the bearing.

[0015] A temperature sensor, wherein the sensing probe of the temperature sensor is used to contact the metal material at the center of the bottom of the cooling fan under test;

[0016] Accelerometer, used to be installed on the bottom side of the cooling fan under test;

[0017] A terminal block is installed on one side of the rotating frame, and the terminal block is provided with several terminals; the terminals are used to connect to the electrical signal of the cooling fan under test, so as to realize power supply, speed control and speed signal feedback of the cooling fan under test.

[0018] In a further description of the present invention, two rotating supports are provided and arranged in a front-to-back distribution; a turntable is rotatably connected to each of the two rotating supports; the front end of the turntable of the front rotating support extends to the front side of the rotating support and is fixed with a pointer; a rotating scale is provided on the front side of the front rotating support; the pointer is located at the center of the rotating scale; the front and rear ends of the rotating support are fixedly connected to the two turntables respectively.

[0019] In a further description of the present invention, the rotating frame includes a polygonal outer frame and multiple reinforcing rods arranged radially within the outer frame; the outer ends of the multiple reinforcing rods are respectively fixed to the inner sidewalls of the outer frame, and the inner ends of the multiple reinforcing rods converge at the central region of the outer frame cavity, forming a placement part for supporting the cooling fan under test; a plurality of spaced mounting adjustment holes are provided on the reinforcing rods along their extension direction; the clamping device is mounted on the reinforcing rods and connected to the mounting adjustment holes.

[0020] In a further description of the present invention, three reinforcing support rods are provided, and the three reinforcing support rods extend from the center of the outer frame to the left, right and rear sides respectively; three sets of clamping devices are provided; the three sets of clamping devices are installed one-to-one on the three reinforcing support rods; the wiring bracket is fixed on the outer frame.

[0021] In a further description of the present invention, the clamping device includes a positioning screw, a locking plate, and a tightening screw; the positioning screw is threadedly connected to one of the mounting adjustment holes of the reinforcing support rod; one end of the locking plate is rotatably connected to the positioning screw; the locking plate has a waist-shaped hole in the middle; the head of the tightening screw abuts against the top of the locking plate, the middle part passes through the waist-shaped hole, and the tail is used to lock onto another mounting adjustment hole, thereby driving the other end of the locking plate to press down and clamp the cooling fan under test.

[0022] As further described in this invention, the conductive post, conductive probe, temperature sensor, accelerometer, and microphone are each directly connected to an external detection instrument via independent wires.

[0023] In a further description of the present invention, four terminals are provided. One end of each of the four terminals is used to connect to the positive wire, negative wire, FG signal line and PWM signal line of the cooling fan under test, respectively, and the other end is connected to an external testing instrument through a wire.

[0024] Further description of the present invention: the Z-axis adjustment device is a Z-axis adjustment platform, including a fixed platform, a movable platform, a gear, a rack, and an adjustment knob; the fixed platform is vertically fixed at the front of the upper surface of the rotating frame; the rear side of the fixed platform is provided with a gear receiving groove and a rack sliding groove; the movable platform is slidably connected to the rear side of the fixed platform; the rack is fixed to the front side of the movable platform and slidably connected to the rack sliding groove; the adjustment knob is rotatably connected to the left and right sides of the fixed platform; one end of the adjustment knob extends into the fixed platform and is fixedly connected to the gear; the gear is located in the gear receiving groove and meshes with the rack; the front end of the connecting frame is fixed to the rear side of the movable platform.

[0025] As further described in the present invention, the sensing probe of the temperature sensor is bonded to the metal material at the bottom of the cooling fan under test by thermally conductive adhesive.

[0026] As further described in the present invention, the top of the accelerometer has a wax surface, and the accelerometer is adhered to the bottom of the cooling fan to be tested by means of the wax surface.

[0027] The beneficial effects of this invention are as follows:

[0028] This invention provides an integrated, multi-dimensional detection device for evaluating the oil film condition of a cooling fan. By integrating a conductive brush assembly, conductive probe, microphone, accelerometer, and temperature sensor onto the same rotating frame, it can simultaneously collect signals of multiple physical quantities, such as electrical characteristics, vibration, noise, and temperature, after the fan is clamped once, comprehensively reflecting the oil film lubrication condition. This effectively overcomes the shortcomings of traditional single-index detection, which is prone to misjudgment, and significantly improves the accuracy of oil film condition evaluation.

[0029] The rotating frame adopts a movable connection structure that can rotate around the Y-axis. The rotating frame can drive the fan to actively rotate to multiple preset azimuth angles, or even perform continuous dynamic rotation. It can realize static or dynamic detection schemes that can be adjusted to different angles, and can be used according to detection needs to further improve detection accuracy. Attached Figure Description

[0030] Figure 1 This is an overall structural diagram of the present invention;

[0031] Figure 2 This is a bottom view of a partial structure of the present invention;

[0032] Figure 3 This is a structural diagram of the rotating frame, clamping device, conductive probe assembly, microphone, and wiring bracket of the present invention;

[0033] Figure 4 This is a partial exploded view of the Z-axis adjustment device of the present invention from the rear view direction. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings:

[0035] like Figure 1-4 As shown, the present invention provides a cooling fan oil film detection device, which mainly includes a mounting base plate 1, a rotating bracket 2, a rotating frame 3, a clamping device 4, a conductive brush assembly 5, a microphone 6, a conductive probe assembly 7, a temperature sensor 8, an accelerometer 9, and a wiring bracket 10.

[0036] A rotating bracket 2 is vertically fixed on the mounting base 1, serving as the supporting foundation for the rotating frame 3. The rotating frame 3 is rotatably connected to the rotating bracket 2 around the Y-axis (i.e., the front-to-back direction), and the center of the upper surface of the rotating frame 3 is used to place the cooling fan 100 under test. A clamping device 4 is mounted on the rotating frame 3 to clamp and fix the cooling fan 100 under test. A conductive brush assembly 5 is mounted above the rotating frame 3 to contact the fan blade shaft end face 101 of the cooling fan 100 under test. A microphone 6 is fixed to the bottom of the rotating frame 3 and contacts one side of the bottom of the cooling fan 100 under test to collect sound signals when the fan is running. A conductive probe assembly 7 is fixed to the bottom of the rotating frame 3 to contact the metal material 102 at the bottom of the cooling fan 100 under test. The sensing probe of the temperature sensor 8 is used to contact the metal material 102 at the center of the bottom of the cooling fan 100 under test to collect temperature signals. An accelerometer 9 is mounted on one side of the bottom of the cooling fan 100 under test to collect vibration signals. The terminal block 10 is installed on one side of the rotating frame 3. The terminal block 10 is provided with several terminals 11, which are used to connect to the electrical signals (power lines, signal lines, etc.) of the cooling fan 100 under test.

[0037] Two rotating supports 2 are provided, arranged one in front of the other. Each of the two rotating supports 2 is rotatably connected to a turntable 12 via bearings. The front end of the turntable 12 of the front rotating support 2 extends to the front side of the rotating support 2 and is fixed with a pointer 13; a rotating scale 14 is provided on the front side of the front rotating support 2, with the pointer 13 located at the center of the rotating scale 14. The front and rear ends of the rotating frame 3 are fixedly connected to the two turntables 12, thereby allowing the rotating frame 3 to rotate freely around the Y-axis (i.e., the direction of the line connecting the centers of the two turntables 12).

[0038] With the above structure, the operator can push the rotating frame 3 to rotate it around the Y-axis to any desired angle, and accurately read the current rotation angle by the pointer 13 on the rotating dial 14. During the test, the rotating frame 3 can be rotated to different preset positions, or the rotating frame 3 can be continuously and slowly rotated during the test, thereby changing the influence of gravity on the oil film distribution and shaft contact state inside the cooling fan 100 under test. Multiple physical quantity signals are collected under different spatial postures, which fully exposes the hidden anomalies caused by uneven oil film distribution, reduced load-bearing capacity, or shaft offset under specific positions, making the test results closer to the actual operating conditions of the fan after installation.

[0039] The rotating frame 3 includes a polygonal outer frame 31 and multiple reinforcing support rods 32 arranged radially within the outer frame.

[0040] Multiple reinforcing rods 32 have their outer ends fixed to the inner sidewalls of the outer frame 31, and their inner ends converge in the central area of ​​the outer frame 31 cavity, forming a placement part 33 for supporting the cooling fan 100 under test. Several spaced-apart mounting adjustment holes 34 are provided on the reinforcing rods 32 along their extension direction. A clamping device 4 is mounted on the reinforcing rods 32 and connected to the mounting adjustment holes 34. By installing the clamping device 4 on different mounting adjustment holes 34, cooling fans of different sizes and specifications can be adapted.

[0041] In this embodiment, three reinforcing rods 32 are provided, extending from the center of the outer frame to the left, right, and rear sides respectively, to form a stable triangular support structure. Correspondingly, three sets of clamping devices 4 are provided, each set being installed on one of the three reinforcing rods 32. The wiring bracket 10 is fixed to the outer frame 31.

[0042] The clamping device 4 includes a positioning screw 41, a locking plate 42, and a locking screw 43. The positioning screw 41 is threaded onto one of the mounting adjustment holes 34 of the reinforcing support rod 32. One end of the locking plate 42 is rotatably connected to the positioning screw 41. The locking plate 42 has a waist-shaped hole 44 in its middle. The head of the locking screw 43 abuts against the top of the locking plate 42, the middle of the locking screw 43 passes through the waist-shaped hole 44, and the tail of the locking screw 43 is used to lock onto another mounting adjustment hole 34, thereby driving the other end of the locking plate 42 to press down and press the cooling fan 100 under test onto the placement part 33.

[0043] During clamping, first, according to the size of the cooling fan 100 to be tested, select the appropriate mounting adjustment hole 34 on the reinforcing support rod 32, and screw the positioning screw 41 and the locking screw 43 into the corresponding mounting adjustment hole 34 respectively; then, place the cooling fan 100 to be tested on the placement part 33, adjust the position of the locking plate 42 so that the other end of the locking plate 42 presses against the upper surface edge of the fan; finally, tighten the locking screw 43, and the head of the locking screw 43 presses the locking plate 42 downward, so that the other end of the locking plate 42 firmly presses the fan onto the placement part 33.

[0044] The conductive brush assembly 5 is mounted above the rotating frame 3. The conductive brush assembly 5 includes a Z-axis adjustment device 51, a connecting frame 52, a first insulating sleeve 53, a conductive post 54, and a conductive brush 55. The Z-axis adjustment device 51 is mounted on the rotating frame 3. One end of the connecting frame 52 is fixed to the output end of the Z-axis adjustment device 51 and its height is adjusted by the Z-axis adjustment device 51. The conductive post 54 is mounted on the other end of the connecting frame 52 via the first insulating sleeve 53. The first insulating sleeve 53 electrically isolates the conductive post 54 from the connecting frame 52 to prevent external interference signals from coupling into the detection circuit through the connecting frame 52. The conductive brush 55 is fixed to the lower end of the conductive post 54. The conductive brush 55 is composed of multiple bundles of fine, soft carbon fiber filaments, possessing flexibility and capable of forming a stable and reliable electrical contact with the fan blade shaft end face 101. Driven by the Z-axis adjustment device 51, the conductive brush 55 rises and falls with the connecting frame 52 to abut or disengage from the fan blade shaft end face 101 of the cooling fan 100 under test.

[0045] The Z-axis adjustment device 51 is a Z-axis adjustment platform, specifically including a fixed platform 511, a movable platform 512, a gear 513, a rack 514, and an adjustment knob 515. The fixed platform 511 is vertically fixed at the front of the upper surface of the rotating frame 3. A gear receiving groove and a rack slide groove are provided on the rear side of the fixed platform 511. The movable platform 512 is slidably connected to the rear side of the fixed platform 511 through the cooperation of a slide rail and a slide groove. The rack 514 is fixed to the front side of the movable platform 512 and slidably connected to the rack slide groove. The adjustment knob 515 is rotatably connected to the left and right sides of the fixed platform 511, with one end of the knob 515 extending into the fixed platform 511 and fixedly connected to the gear 513. The gear 513 is located in the gear receiving groove and meshes with the rack 514. The front end of the connecting frame 52 is fixed to the rear side of the movable platform 512.

[0046] During adjustment, the operator rotates the adjustment knob 515, driving the gear 513 to rotate. The gear 513 drives the rack 514 meshing with it to move up and down. The rack 514 drives the movable platform 512 to slide up and down along the fixed platform 511, thereby causing the connecting frame 52 and the conductive post 54 and conductive brush 55 fixed on the connecting frame 52 to rise and fall synchronously. When the conductive brush 55 descends to contact the end face 101 of the fan blade shaft of the cooling fan 100 under test, the conductive connection is completed. Through the above adjustment, the conductive brush 55 can be adapted to cooling fans of different thicknesses.

[0047] The conductive probe assembly 7 includes a probe holder 71, a second insulating sleeve 72, and a conductive probe 73. The probe holder 71 is fixed to the bottom of the rotating frame 3. In this embodiment, the probe holder 71 is fixed to the lower surface of the left reinforcing support rod 32 by bolts. The conductive probe 73 is fixed to the probe holder 71 by the second insulating sleeve 72, which electrically isolates the conductive probe 73 from the probe holder 71. The conductive probe 73 is located at the center of the rotating frame 3. When the cooling fan 100 under test is clamped on the rotating frame 3, the top of the conductive probe 73 contacts the metal material 102 at the bottom of the cooling fan 100. In this embodiment, the cooling fan has a bearing sleeve at its center, which is made of copper. The conductive probe 73 contacts the bottom center of the bearing sleeve to conduct electricity. Alternatively, the metal material 102 at the bottom of the cooling fan 100 can also be a bearing.

[0048] The microphone 6 is mounted on the rotating frame 3 with its pickup port facing upwards. The pickup port of the microphone 6 is close to or in contact with the bottom surface of the cooling fan 100 under test. In this embodiment, the rotating frame 3 has a microphone mounting through hole, and the upper end of the microphone 6 is fixed in the microphone mounting through hole. The pickup port of the microphone 6 faces upwards and is directly opposite the bottom of the cooling fan 100 under test. When the cooling fan 100 under test is clamped and fixed, the pickup surface of the microphone 6 contacts one side of the bottom of the fan (or maintains a small gap of 0.5mm to 2mm) to collect the acoustic noise signal generated when the fan is running.

[0049] The sensing probe 81 of the temperature sensor 8 is used to contact the metal material 102 at the center of the bottom of the cooling fan 100 under test. In this embodiment, the sensing probe 81 of the temperature sensor 8 is bonded to the metal material 102 at the bottom of the cooling fan 100 under test with thermally conductive adhesive, that is, in contact with the bearing sleeve and located next to the conductive probe 73. Specifically, before clamping the cooling fan 100 under test onto the rotating frame 3, the operator first attaches the sensing probe 81, and then places it on the rotating frame 3 for clamping. After the test is completed, the sensing probe 81 is removed and attached to the next cooling fan 100 under test.

[0050] Accelerometer 9 (i.e., accelerometer sensor) is installed on one side of the bottom of the cooling fan 100 under test to collect vibration acceleration signals during fan operation. The top of accelerometer 9 has a wax surface (i.e., a layer of paraffin wax or similar hot-melt adhesive material is coated on the mounting surface of accelerometer 9). In use, the operator first adheres accelerometer 9 to a flat surface on one side of the bottom of the cooling fan 100 under test through the wax surface, then clamps the cooling fan 100 under test for testing. After testing, it is removed and attached to the next cooling fan 100 under test.

[0051] The terminal block 10 is mounted on one side of the rotating frame 3. Specifically, the terminal block 10 is fixed to the front right part of the outer frame 31.

[0052] In this embodiment, four terminals 11 are provided. One end of each terminal 11 is used to connect to the positive wire (Vcc), negative wire (GND), FG signal line (speed feedback signal), and PWM signal line (speed control signal) of the cooling fan 100 under test, respectively. The other end is connected to an external testing instrument through a wire.

[0053] In addition, the conductive post 54, conductive probe 73, temperature sensor 8, accelerometer 9, and microphone 6 are each directly connected to an external testing instrument via independent wires. The external testing instrument has a data acquisition card to collect various data.

[0054] The above description is not intended to limit the scope of the present invention. Any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the present invention.

Claims

1. A cooling fan oil film detection device, characterized in that, include: Install base plate; The rotating bracket is vertically fixed on the mounting base plate; A rotating frame, which can rotate around the Y-axis, is connected to a rotating support. The center of the upper surface of the rotating frame is used to place the cooling fan under test; a clamping device, mounted on the rotating frame, is used to clamp and fix the cooling fan under test; a conductive brush assembly, mounted above the rotating frame, includes a Z-axis adjustment device, a connecting frame, a first insulating sleeve, a conductive post, and a conductive brush; the Z-axis adjustment device is mounted on the rotating frame; one end of the connecting frame is fixed to the output end of the Z-axis adjustment device and its height is adjusted by the Z-axis adjustment device; the conductive post is mounted on the other end of the connecting frame through the first insulating sleeve; the conductive brush is fixed to the lower end of the conductive post; the conductive brush moves up and down with the connecting frame under the drive of the Z-axis adjustment device to abut or disengage from the fan blade axis end face of the cooling fan under test; a microphone, with its pickup port facing upwards and fixed on the rotating frame, the microphone's pickup port being close to... The device may contact the bottom surface of the cooling fan under test; a conductive probe assembly, including a probe base, a second insulating sleeve, and a conductive probe; the probe base is fixed to the bottom of the rotating frame; the conductive probe is fixed to the probe base by the second insulating sleeve; the conductive probe is located at the center of the rotating frame; when the cooling fan under test is clamped on the rotating frame, the conductive probe contacts the bottom metal material of the bearing sleeve of the cooling fan under test or the bottom metal material of the bearing; a temperature sensor, the sensing probe of which is used to contact the metal material at the center of the bottom of the cooling fan under test; an accelerometer, used to be installed on one side of the bottom of the cooling fan under test; a wiring bracket, installed on one side of the rotating frame, the wiring bracket having several terminals; the terminals are used to connect to the electrical signal of the cooling fan under test to realize power supply, speed control, and speed signal feedback for the cooling fan under test.

2. The cooling fan oil film detection device according to claim 1, characterized in that, Two rotating supports are provided and arranged in a front-to-back configuration; a turntable is rotatably connected to each of the two rotating supports; the front end of the turntable of the front rotating support extends to the front side of the rotating support and is fixed with a pointer; a rotating scale is provided on the front side of the front rotating support; the pointer is located at the center of the rotating scale; the front and rear ends of the rotating support are fixedly connected to the two turntables respectively.

3. The cooling fan oil film detection device according to claim 1, characterized in that, The rotating frame includes a polygonal outer frame and multiple reinforcing rods arranged radially within the outer frame. The outer ends of the multiple reinforcing rods are respectively fixed to the inner sidewalls of the outer frame, and the inner ends of the multiple reinforcing rods converge at the central area of ​​the outer frame cavity, forming a placement part for supporting the cooling fan under test. Several spaced installation adjustment holes are provided on the reinforcing rods along their extension direction. The clamping device is installed on the reinforcing rods and connected to the installation adjustment holes.

4. The cooling fan oil film detection device according to claim 3, characterized in that, Three reinforcing support rods are provided, extending from the center of the outer frame to the left, right, and rear sides respectively; three sets of clamping devices are provided; the three sets of clamping devices are installed one-to-one on the three reinforcing support rods; the wiring bracket is fixed to the outer frame.

5. The cooling fan oil film detection device according to claim 3, characterized in that, The clamping device includes a positioning screw, a locking plate, and a tightening screw; the positioning screw is threadedly connected to one of the mounting adjustment holes of the reinforcing support rod; one end of the locking plate is rotatably connected to the positioning screw; the locking plate has a waist-shaped hole in the middle; the head of the tightening screw abuts against the top of the locking plate, the middle part passes through the waist-shaped hole, and the tail is used to lock onto another mounting adjustment hole, thereby driving the other end of the locking plate to press down and clamp the cooling fan under test.

6. The cooling fan oil film detection device according to claim 1, characterized in that, The conductive post, conductive probe, temperature sensor, accelerometer, and microphone are each directly connected to an external testing instrument via independent wires.

7. The cooling fan oil film detection device according to claim 1, characterized in that, The terminal block is provided with four terminals. One end of each terminal block is used to connect to the positive wire, negative wire, FG signal line, and PWM signal line of the cooling fan under test, respectively. The other end is connected to an external testing instrument via a wire.

8. The cooling fan oil film detection device according to claim 1, characterized in that, The Z-axis adjustment device is a Z-axis adjustment platform, including a fixed platform, a movable platform, a gear, a rack, and an adjustment knob. The fixed platform is vertically fixed at the front of the upper surface of the rotating frame. The rear side of the fixed platform is provided with a gear receiving groove and a rack slide groove. The movable platform is slidably connected to the rear side of the fixed platform. The rack is fixed to the front side of the movable platform and slidably connected to the rack slide groove. The adjustment knob is rotatably connected to the left and right sides of the fixed platform. One end of the adjustment knob extends into the fixed platform and is fixedly connected to the gear. The gear is located in the gear receiving groove and meshes with the rack. The front end of the connecting frame is fixed to the rear side of the movable platform.

9. The cooling fan oil film detection device according to claim 1, characterized in that: The temperature sensor's probe is attached to the metal part at the bottom of the cooling fan being tested using thermally conductive adhesive.

10. The cooling fan oil film detection device according to claim 1, characterized in that: The accelerometer has a waxed surface on its top, and the accelerometer is attached to the bottom of the cooling fan to be tested by means of the waxed surface.

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