Fatigue life testing device for fan blade

Abstract

The invention provides a fatigue life testing device for fan blades, and relates to the technical field of material performance tests.The fatigue life testing device comprises a detection bin, a driving mechanism is fixedly installed at the rear end of the detection bin, the detection bin comprises a detection supporting frame, a detection air bin is transversely and rotationally installed in the detection supporting frame, and a detection sliding groove is formed in the top of the detection air bin; air vents are formed in the two sides of the detection air bin, an air inlet is fixedly formed in one of the air vents in the detection air bin, and a plurality of temperature detectors are fixedly installed at the bottom of the detection air bin. Through cooperation of the spherical swing clamp and the adjusting ring, the fatigue life of the fan blade when the fan blade is vibrated in different directions can be detected; according to the invention, the influence of different wind directions on fan blade vibration during working of the fan blade can be simulated through the detection wind bin, so that the fatigue life of the fan in different wind power environments can be detected.

Description

Technical Field

[0001] The present invention relates to the technical field of material property testing, and particularly relates to a fatigue life testing device for fan blades. Background Art

[0002] Fan blade fatigue refers to the phenomenon of structural deterioration of fan blades during long-term use due to continuously subjected to dynamically changing stresses. This fatigue is caused by the cyclic load changes that the blades bear during operation, resulting in the accumulation of microscopic damages inside the material, and ultimately leading to blade fracture or performance degradation due to deformation.

[0003] Existing fan blade fatigue life detection devices can only perform fatigue detection on the fan blades through a single vibration direction, and cannot simulate and detect the fatigue life of the fan blades under the influence of external factors during operation, resulting in the detection results being difficult to apply in the actual use process.

[0004] Based on this, the present invention provides a fatigue life testing device for fan blades. Summary of the Invention

[0005] In view of the above technical problems, the present invention provides a fatigue life testing device for fan blades, including a detection chamber. A driving mechanism is fixedly installed at the rear end of the detection chamber. It is characterized in that the detection chamber includes a detection support frame, a detection air chamber is horizontally rotatably installed inside the detection support frame. A detection chute is provided at the top of the detection air chamber, ventilation openings are provided on both sides of the detection air chamber, an air inlet is fixedly installed on one of the ventilation openings of the detection air chamber, and a plurality of temperature detectors are fixedly installed at the bottom of the detection air chamber.

[0006] Further, a plurality of pulling mechanisms are longitudinally slidably installed at the top of the detection support frame. The pulling mechanism includes a pulling sliding bracket, a rope winding wheel is horizontally rotatably installed inside the pulling sliding bracket. A detection rope is wound around the rope winding wheel, the bottom of the rope is fixedly installed with an arc-shaped connecting plate, a fan blade gripper is horizontally rotatably installed inside the arc-shaped connecting plate, and an infrared signal generator is fixedly installed at the front end of the fan blade gripper.

[0007] Further, a feeding cover plate is hinged at the front end of the detection support frame. A signal detection plate is horizontally rotatably installed in the middle of the feeding cover plate. A first adjustment motor and a first driving motor are fixedly installed on the feeding cover plate. Gears are fixedly installed on the first adjustment motor and the first driving motor. A gear is fixedly installed on the outer circle of the signal detection plate. The gear on the first adjustment motor meshes with the gear on the outer circle of the signal detection plate. A feeding port is provided at the front end of the detection air chamber, and a gear is fixedly installed on the outer circle of the feeding port. The gear at the front end of the detection air chamber meshes with the gear on the first driving motor.

[0008] Furthermore, the driving mechanism includes a driving bracket fixedly installed at the rear end of the detection support bracket. At the center of the front end of the driving bracket, there is a spherical swing clamp with a ball hinge. At the front end of the spherical swing clamp, there is a fan blade jaw fixedly installed. At the rear end of the spherical swing clamp, there is a connecting short rod fixedly installed. At the top of the driving bracket, there is a second adjustment motor with a gear fixedly installed on it. At the rear end of the driving bracket, there is an adjustment ring rotatably installed horizontally. There is a gear fixedly installed on the adjustment ring, and the gear on the adjustment ring meshes with the gear on the second adjustment motor. There is a limiting sliding groove on the adjustment ring, and the connecting short rod at the rear end of the spherical swing clamp is slidably matched with the limiting sliding groove on the adjustment ring. At the rear end of the driving bracket, there is a third driving motor with a driving eccentric wheel fixedly installed at its front end. The driving eccentric wheel and the spherical swing clamp are articulated through a transmission short rod.

[0009] Furthermore, between the top of the detection air chamber and the detection support bracket, there is a sealing cover plate slidably installed. Inside the inner wall of the sealing cover plate, there is a wind force detection rod fixedly installed through a support rod. The support rod on the inner wall of the sealing cover plate is slidably matched with the detection sliding groove at the top of the detection air chamber.

[0010] Furthermore, at the top of the detection support bracket, there is a detection cover plate. Inside the detection cover plate, there is a pulling transmission rod rotatably installed horizontally. There are multiple gears fixedly installed on the pulling transmission rod. The gears on the pulling transmission rod correspond to the rope winding pulleys and mesh with them. At the rear end of the detection cover plate, there is a second driving motor, and the output shaft of the second driving motor is fixedly connected to the pulling transmission rod.

[0011] Furthermore, both sides of the pulling sliding bracket are inverted conical surfaces. There are multiple pairs of adjustment sliders slidably installed horizontally at the top of the detection support bracket. Between the inner sides of the adjustment sliders and the detection support bracket, there are compression springs fixedly installed. The inner sides of the adjustment sliders are inverted conical surfaces, and the conical surfaces on the inner sides of the adjustment sliders are slidably matched with the conical surfaces on both sides of the pulling sliding bracket. There are multiple positioning sliders slidably installed vertically at the top of the detection support bracket. Between the bottoms of the positioning sliders and the detection support bracket, there are compression springs fixedly installed. There is a positioning groove at the bottom of the adjustment slider, and there is a positioning triangular key at the top of the positioning slider. The positioning triangular key at the top of the positioning slider is slidably matched with the positioning groove at the bottom of the adjustment slider.

[0012] The beneficial effects of the present invention compared with the prior art are as follows: (1) Through the cooperation of the spherical swing clamp and the adjustment ring, the present invention can detect the fatigue life of the fan blade when it is vibrated in different directions; (2) Through the detection air chamber, the present invention can simulate the influence of different wind directions on the vibration of the fan blade during operation, so as to detect the fatigue life of the fan in different wind force environments; (3) Through the pulling mechanism, the present invention can pull the fan blade at different positions, simulating the bending situation of the fan blade under the gravity pull at different lengths, which is convenient for detecting the fatigue life of this kind of fan blade at different lengths when the length of the fan blade sample is limited. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic side structure diagram of the present invention.

[0014] Figure 2 This is a schematic front-end structure diagram of the present invention.

[0015] Figure 3 This is a schematic overall structure diagram of the present invention.

[0016] Figure 4 This is a schematic half-sectional structure diagram of the detection support frame of the present invention.

[0017] Figure 5 This is a schematic overall half-sectional structure diagram of the present invention.

[0018] Figure 6 This is a schematic internal structure diagram of the detection air chamber of the present invention.

[0019] Figure 7 is Figure 5 an enlarged structure diagram at A1 in

[0020] Reference numerals: 1 - detection chamber; 2 - drive mechanism; 3 - pulling mechanism; 101 - detection cover plate; 102 - detection support frame; 103 - sealing cover plate; 104 - detection air chamber; 105 - adjustment slider; 106 - positioning slider; 107 - feed cover plate; 108 - first adjustment motor; 109 - signal detection board; 110 - first drive motor; 111 - second drive motor; 112 - pulling transmission rod; 113 - wind force detection rod; 114 - temperature detector; 115 - air inlet; 201 - second adjustment motor; 202 - adjustment ring; 203 - transmission short rod; 204 - spherical swing clamp; 205 - drive eccentric wheel; 206 - third drive motor; 207 - drive bracket; 301 - pulling sliding bracket; 302 - rope winding wheel; 303 - arc-shaped connecting plate; 304 - fan blade gripper; 305 - infrared signal generator. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Embodiment: As Figures 1 to 7As shown in the figure, a fatigue life test device for a fan blade includes a detection chamber 1. A driving mechanism 2 is fixedly installed at the rear end of the detection chamber 1. The detection chamber 1 includes a detection support frame 102. A detection air chamber 104 is horizontally rotatably installed inside the detection support frame 102. A detection chute is provided at the top of the detection air chamber 104. Ventilation openings are provided on both sides of the detection air chamber 104. An air inlet 115 is fixedly installed on one of the ventilation openings of the detection air chamber 104 for transmitting gas into the detection air chamber 104 to simulate the environment during the operation of the fan blade. At the same time, by adjusting the rotation angle of the detection air chamber 104, the fatigue life of the fan blade under the environment of different wind resistances in different directions can be tested. A plurality of temperature detectors 114 are fixedly installed at the bottom of the detection air chamber 104, and the temperature detectors 114 are used to detect the temperatures at different positions on the fan blade during the fatigue test.

[0023] As Figures 1 to 7 shown in the figure, a feed cover plate 107 is hinged to the front end of the detection support frame 102. A signal detection plate 109 is horizontally rotatably installed in the middle of the feed cover plate 107. A first adjustment motor 108 and a first driving motor 110 are fixedly installed on the feed cover plate 107. Gears are fixedly installed on the first adjustment motor 108 and the first driving motor 110. Gears are fixedly installed on the outer ring of the signal detection plate 109. The gear on the first adjustment motor 108 meshes with the gear on the outer ring of the signal detection plate 109. A feed port is provided at the front end of the detection air chamber 104. A gear is fixedly installed on the outer ring of the feed port. The gear at the front end of the detection air chamber 104 meshes with the gear on the first driving motor 110 for adjusting the rotation angle of the detection air chamber 104 inside the detection support frame 102.

[0024] As Figures 1 to 7 shown in the figure, a sealing cover plate 103 is slidably installed between the top of the detection air chamber 104 and the detection support frame 102. A wind force detection rod 113 is fixedly installed on the inner wall of the sealing cover plate 103 through a support rod. The support rod on the inner wall of the sealing cover plate 103 is slidably matched with the detection chute at the top of the detection air chamber 104. The wind force detection rod 113 is used to detect the wind speed and wind direction inside the detection air chamber 104 for detecting the influence of the fan blade on the wind direction and wind speed at different fatigue degrees.

[0025] As Figures 1 to 7As shown in the figure, the driving mechanism 2 includes a driving bracket 207. The driving bracket 207 is fixedly installed at the rear end of the detection support bracket 102. At the center of the front end of the driving bracket 207, there is a spherical swing clamp 204. A fan blade clamp is fixedly installed at the front end of the spherical swing clamp 204 for clamping the detected fan blade. A connecting short rod is fixedly installed at the rear end of the spherical swing clamp 204. A second adjustment motor 201 is fixedly installed at the top of the driving bracket 207. A gear is fixedly installed on the second adjustment motor 201. An adjustment ring 202 is horizontally rotatably installed at the rear end of the driving bracket 207. A gear is fixedly installed on the adjustment ring 202. The gear on the adjustment ring 202 meshes with the gear on the second adjustment motor 201. A limiting chute is provided on the adjustment ring 202. The connecting short rod at the rear end of the spherical swing clamp 204 is slidably matched with the limiting chute on the adjustment ring 202, which is used to limit the rotation range of the spherical swing clamp 204 on the driving bracket 207. At the same time, by starting the second adjustment motor 201 to drive the adjustment ring 202 to rotate, the angle of the limiting chute on the adjustment ring 202 can be adjusted, so as to change the rotation range of the spherical swing clamp 204 on the driving bracket 207, which is convenient for testing the fatigue life of the fan blade when it is installed at different angles. A third driving motor 206 is fixedly installed at the rear end of the driving bracket 207. A driving eccentric wheel 205 is fixedly installed at the front end of the third driving motor 206. The driving eccentric wheel 205 is hinged to the spherical swing clamp 204 through a transmission short rod 203. By starting the third driving motor 206 to drive the driving eccentric wheel 205 to rotate, when the driving eccentric wheel 205 rotates, it can drive the spherical swing clamp 204 to swing and rotate reciprocally on the driving bracket 207 through the transmission short rod 203, so as to conduct a vibration fatigue test on the fan blade.

[0026] As Figures 1 to 7 shown in the figure, a plurality of pulling mechanisms 3 are longitudinally slidably installed at the top of the detection support bracket 102. The pulling mechanism 3 includes a pulling sliding bracket 301. A rope winding wheel 302 is horizontally rotatably installed inside the pulling sliding bracket 301. A detection rope is wound around the rope winding wheel 302. An arc-shaped connecting plate 303 is fixedly installed at the bottom of the rope. A fan blade clamp 304 is horizontally rotatably installed inside the arc-shaped connecting plate 303. The fan blade clamp 304 is used to clamp the fan blade and detect the vibration amplitude of the fan blade. At the same time, the fan blade can be pulled as needed to simulate the situation when fan blades of different lengths are bent under the action of gravity. An infrared signal generator 305 is fixedly installed at the front end of the fan blade clamp 304. The infrared signal generator 305 faces the signal detection board 109. The infrared signal generator 305 is used to transmit the vibration curve of the fan blade during detection to the signal detection board 109, which is convenient for real-time detection of the vibration frequency and amplitude of the fan blade.

[0027] As Figures 1 to 7As shown, both sides of the pulling and sliding bracket 301 are inverted conical surfaces. Multiple pairs of adjusting sliders 105 are horizontally slidably installed at the top of the detection support frame 102. Compression springs are fixedly installed between the inner sides of the adjusting sliders 105 and the detection support frame 102. The inner sides of the adjusting sliders 105 are inverted conical surfaces. The conical surfaces on the inner sides of the adjusting sliders 105 are in sliding fit with the conical surfaces on both sides of the pulling and sliding bracket 301. Multiple positioning sliders 106 are longitudinally slidably installed at the top of the detection support frame 102. Compression springs are fixedly installed between the bottoms of the positioning sliders 106 and the detection support frame 102. Positioning grooves are provided at the bottoms of the adjusting sliders 105, and positioning triangular keys are provided at the tops of the positioning sliders 106. The positioning triangular keys at the tops of the positioning sliders 106 are in sliding fit with the positioning grooves at the bottoms of the adjusting sliders 105 and are in contact fit with the outer surfaces of the adjusting sliders 105 at the same time.

[0028] As Figures 1 to 7 As shown, a detection cover plate 101 is fixedly installed at the top of the detection support frame 102. A pulling transmission rod 112 is horizontally rotatably installed inside the detection cover plate 101. Multiple gears are fixedly installed on the pulling transmission rod 112. The gears on the pulling transmission rod 112 correspond to the rope winding pulleys 302 and are meshed with the rope winding pulleys 302. A second driving motor 111 is fixedly installed at the rear end of the detection cover plate 101. The output shaft of the second driving motor 111 is fixedly connected to the pulling transmission rod 112. By pressing the adjusting slider 105 to slide towards the center of the detection cover plate 101, the pulling and sliding bracket 301 is driven to slide upwards at the top of the detection support frame 102, so that the corresponding rope winding pulley 302 is meshed with the corresponding gear on the pulling transmission rod 112. At the same time, the triangular key on the positioning slider 106 is in contact fit with the outer side of the adjusting slider 105 to fix the position of the adjusting slider 105, thereby fixing the height of the pulling and sliding bracket 301. Then, the second driving motor 111 is started to drive the pulling transmission rod 112 to rotate, driving the rope winding pulley 302 to rotate, and pulling the fan blade by the rope on the rope winding pulley 302 through the fan blade gripper 304.

[0029] Working principle: When it is necessary to detect the fatigue life of the fan blade, open the feeding cover plate 107 to clamp the fan blade to be detected on the front fan blade gripper, then pull down the fan blade gripper 304 to clamp it on one side of the fan blade, and then close the feeding cover plate 107 to prepare for detecting the fan blade.

[0030] During detection, press the adjusting slider 105 at the required position according to the requirements, drive the corresponding pulling and sliding bracket 301 to slide at the top of the detection support frame 102, so that the rope winding pulley 302 is meshed with the gear on the pulling transmission rod 112, and then start the second driving motor 111 to drive the rope winding pulley 302 to rotate, pulling the fan blade to simulate the fatigue life of the fan blade under different tensile forces.

[0031] After that, start the third driving motor 206 to drive the driving eccentric wheel 205 to rotate. The rotation of the driving eccentric wheel 205 drives the spherical swing clamp 204 to swing along the direction of the limit chute on the adjusting ring 202. During this period, the adjusting ring 202 can be driven to rotate by starting the second adjusting motor 201 to adjust the swinging direction of the spherical swing clamp 204, and the fatigue life of the fan during vibration in different directions can be detected. Then, the vibration frequency and vibration route of the fan blade are transmitted to the signal detection board 109 through the infrared signal generator 305 and detected in real time by the signal detection board 109. At the same time, the temperature detector 114 is used to detect the temperatures of different nodes on the fan blade.

[0032] During the detection, air is conveyed into the detection air chamber 104 through an external blower to blow the fan blade. At the same time, start the first driving motor 110 to drive the detection air chamber 104 to rotate to change the blowing direction, and detect the fatigue life of the fan blade under the influence of different wind speeds.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; under the idea of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order, and there are many other changes in different aspects of the present invention as described above. For the sake of simplicity, they are not provided in detail; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fatigue life test device for a fan blade, comprising a detection chamber (1), and a driving mechanism (2) fixedly installed at the rear end of the detection chamber (1), characterized in that, The detection bin (1) includes a detection support frame (102). A detection air bin (104) is horizontally and rotatably installed inside the detection support frame (102). A detection chute is provided at the top of the detection air bin (104). Ventilation openings are provided on both sides of the detection air bin (104). An air inlet (115) is fixedly installed on one of the ventilation openings of the detection air bin (104). A plurality of temperature detectors (114) are fixedly installed at the bottom of the detection air bin (104). A plurality of pulling mechanisms (3) are longitudinally slidably installed at the top of the detection support frame (102). The pulling mechanism (3) includes a pulling sliding bracket (301). A rope winding wheel (302) is horizontally and rotatably installed inside the pulling sliding bracket (301). A detection rope is wound around the rope winding wheel (302). An arc-shaped connecting plate (303) is fixedly installed at the bottom of the rope. A fan blade gripper (304) is horizontally and rotatably installed inside the arc-shaped connecting plate (303). An infrared signal generator (305) is fixedly installed at the front end of the fan blade gripper (304).

2. The fatigue life test device for a fan blade according to claim 1, wherein, A feed cover plate (107) is hinged to the front end of the detection support frame (102). A signal detection plate (109) is horizontally and rotatably installed in the middle of the feed cover plate (107). A first adjustment motor (108) and a first drive motor (110) are fixedly installed on the feed cover plate (107). Gears are fixedly installed on the first adjustment motor (108) and the first drive motor (110).

3. The fatigue life test device for a fan blade according to claim 2, wherein Gears are fixedly installed on the outer circle of the signal detection plate (109). The gear on the first adjustment motor (108) meshes with the gear on the outer circle of the signal detection plate (109).

4. A fatigue life test device for a fan blade according to claim 2, characterized in that, A feed inlet is provided at the front end of the detection air bin (104). Gears are fixedly installed on the outer circle of the feed inlet. The gear at the front end of the detection air bin (104) meshes with the gear on the first drive motor (110).

5. A fatigue life test device for a fan blade according to claim 1, characterized in that, The drive mechanism (2) includes a drive support (207). The drive support (207) is fixedly installed at the rear end of the detection support frame (102). A spherical swing clamp (204) is ball-jointed at the center of the front end of the drive support (207). A fan blade gripper is fixedly installed at the front end of the spherical swing clamp (204). A connecting short rod is fixedly installed at the rear end of the spherical swing clamp (204). A second adjustment motor (201) is fixedly installed at the top of the drive support (207). Gears are fixedly installed on the second adjustment motor (201). An adjustment ring (202) is horizontally and rotatably installed at the rear end of the drive support (207). Gears are fixedly installed on the adjustment ring (202). The gear on the adjustment ring (202) meshes with the gear on the second adjustment motor (201). A limit chute is provided on the adjustment ring (202). The connecting short rod at the rear end of the spherical swing clamp (204) is slidably matched with the limit chute on the adjustment ring (202). A third drive motor (206) is fixedly installed at the rear end of the drive support (207). A drive eccentric wheel (205) is fixedly installed at the front end of the third drive motor (206). The drive eccentric wheel (205) is hinged to the spherical swing clamp (204) through a transmission short rod (203).

6. The fatigue life test device for a fan blade according to claim 1, characterized in that, A sealing cover plate (103) is slidably installed between the top of the detection air bin (104) and the detection support frame (102). A wind force detection rod (113) is fixedly installed on the inner wall of the sealing cover plate (103) through a support rod. The support rod on the inner wall of the sealing cover plate (103) is in sliding fit with the detection sliding groove at the top of the detection air bin (104).

7. The fatigue life test device for a fan blade according to claim 1, characterized in that, A detection cover plate (101) is fixedly installed on the top of the detection support frame (102). A pulling transmission rod (112) is horizontally rotatably installed in the detection cover plate (101). A plurality of gears are fixedly installed on the pulling transmission rod (112). The gears on the pulling transmission rod (112) correspond to the rope winding pulley (302) and are engaged with the rope winding pulley (302). A second driving motor (111) is fixedly installed at the rear end of the detection cover plate (101). The output shaft of the second driving motor (111) is fixedly connected to the pulling transmission rod (112).

8. A fatigue life test device for a fan blade according to claim 1, characterized in that, Both sides of the pulling sliding bracket (301) are inverted conical surfaces. A plurality of pairs of adjusting sliders (105) are horizontally slidably installed on the top of the detection support frame (102). A compression spring is fixedly installed between the inner side of the adjusting slider (105) and the detection support frame (102). The inner side of the adjusting slider (105) is an inverted conical surface. The conical surface on the inner side of the adjusting slider (105) is in sliding fit with the conical surfaces on both sides of the pulling sliding bracket (301). A plurality of positioning sliders (106) are longitudinally slidably installed on the top of the detection support frame (102). A compression spring is fixedly installed between the bottom of the positioning slider (106) and the detection support frame (102). A positioning groove is provided at the bottom of the adjusting slider (105), and a positioning triangular key is provided at the top of the positioning slider (106). The positioning triangular key at the top of the positioning slider (106) is in sliding fit with the positioning groove at the bottom of the adjusting slider (105).

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