Paddle testboard

Abstract

The invention relates to a paddle test bench, which comprises a support frame, and a side mounting frame, a process sleeve, a mounting frame, a vibration assembly and a tension generation assembly which are sequentially distributed on the support frame from left to right, and a strain gauge arranged on a paddle, the main purpose of the invention is to provide a transverse tensile force to the blade by rotating the threaded sleeve, the tensile force sensor feeds back tensile force data and is used for simulating a centrifugal force generated by the blade during working, the vibrator is a vibrator with an eccentric shaft structure, the blade is shaken under the driving of the motor, and the strain gauge feeds back bending moment data generated by the blade due to deformation. The device is used for feeding back the relationship between the resonant frequency and the blade amplitude and providing a reliable basis for testing the service life of the blade.

Description

Technical Field

[0001] The invention relates to the technical field of blade fatigue testing, and in particular to a blade testing bench. Background Art

[0002] The propeller blades are important transmission parts of drones. During the take-off process of the drone, the propeller blades are subjected to periodic alternating loads for a long time. When the propeller blades are damaged due to fatigue, the transmission components of the drone lose their due aerodynamic tension. Therefore, the mechanical fatigue performance of the propeller blades directly affects the service life of the drone. Therefore, it is very necessary to perform fatigue testing on the propeller blades and evaluate their service life.

[0003] Traditional blade fatigue testing machines usually only perform destructive tensile tests on blades and fatigue tests on blade deformation and bending, etc., and often ignore factors such as the centrifugal force and vibration force that the blades are subjected to during operation, and their test data is not accurate enough. Summary of the invention

[0004] In order to overcome the shortcomings of the background technology, the technical solution adopted by the present invention is: a blade test bench, including a support frame, and a side mounting frame, a process sleeve, a mounting frame, a vibration assembly and a tension generating assembly distributed on the support frame from left to right, and a strain gauge arranged on the blade;

[0005] The blades are distributed on both sides of the process sleeve, and the mounting end on one side of the blade is fixedly connected to the process sleeve, and the counterweight end on the other side is clamped to the side mounting frame / mounting frame;

[0006] The vibration assembly includes a vibrator and a motor respectively connected to the mounting frame and the supporting frame, and the output end of the motor is connected to and drives the vibrator;

[0007] The tension generating assembly includes a first reel, a second reel, a cable, an adapter, a tension sensor, a screw, a steering rod and a threaded sleeve. The first reel and the second reel are respectively connected to the two sides of the mounting frame and the adapter, and the first reel is connected to the second reel by winding a cable. The adapter is rotatably connected to the screw through the tension sensor, and the support frame is rotatably connected to the threaded sleeve for adjusting the tension of the blade through the steering rod, and the threaded sleeve is meshedly connected to the screw.

[0008] By adopting the above technical scheme, a lateral tension is applied to the blade by rotating the threaded sleeve, and the tension data is fed back by the tension sensor to simulate the centrifugal force generated by the blade when working. The vibrator is a vibrator with an eccentric shaft structure, and the blade is shaken by the drive of a motor. The strain gauge feeds back the bending moment data generated by the deformation of the blade, which is used to feed back the relationship between the resonant frequency and the amplitude of the blade and provide a reliable basis for testing the service life of the blade. During the vibration test, the first pulley and the second pulley are buffered by the cable to reduce the influence of the vibrator on the tension sensor and maintain the stability of the overall structure.

[0009] The present invention is further configured such that the process sleeve comprises an upper mounting plate and a lower mounting plate, and the mounting end of the blade is fixedly connected between the upper mounting plate and the lower mounting plate by bolts.

[0010] By adopting the above technical solution, two groups of blades are installed on the blade clamp by simulating the process sleeve. During the test, the process sleeve can offset the exciting force generated by the vibrator, thereby improving the accuracy of the experimental data.

[0011] The present invention is further configured such that the side mounting frame / mounting frame includes an outer frame, a clamping plate and an adjusting screw, the clamping plate is slidably connected to the outer frame, the clamping plate is threadedly connected to the adjusting screw, and the adjusting screw abuts against the clamping plate.

[0012] Furthermore, both ends of the outer frame are provided with rotating shaft portions, and the side mounting frame / mounting frame is rotatably connected to the supporting frame / first wire wheel through the rotating shaft portions.

[0013] By adopting the above technical solution, the blades can be quickly installed and removed by rotating the adjusting screw, thereby improving the convenience of testing. When the blade clamp vibrates, the rigid connection of the blades is avoided by the rotating shaft part, thereby preventing the connection between the blades and the side mounting frame / mounting frame from cracking.

[0014] The present invention is further configured such that the support frame is provided with a cross bar, the cross bar is connected to a steering rod through a pin, a threaded sleeve is clamped on the steering rod, and the threaded sleeve is freely rotatable relative to the steering rod, and a handle is provided on the side of the threaded sleeve.

[0015] By adopting the above technical solution, when the pulling force needs to be adjusted, the threaded sleeve is rotated relative to the steering rod by rotating the handle, and the positional relationship between the threaded sleeve and the screw is adjusted, thereby increasing or decreasing the pulling force. The overall structure is simple and easy to operate.

[0016] The present invention is further configured such that the blades are externally connected with strain gauges distributed in a straight line.

[0017] Using the above technical solution, a total of six groups of strain gauges are installed on the blades on both sides of the process sleeve, and the strain gauges are distributed on the same axis. The interval between the strain gauges on each group of blades is 100mm, so as to feedback the bending moment at various positions of the blades and analyze the stress concentration position of the blades, which is convenient for the subsequent improvement of the blade structure.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. By rotating the threaded sleeve, a lateral tension is applied to the blades. The tension sensor feeds back the tension data to simulate the centrifugal force generated by the blades when they are working. The vibrator is an eccentric shaft structure vibrator. The blades are shaken by the drive of the motor. The strain gauge feeds back the bending moment data generated by the deformation of the blades. This is used to feed back the relationship between the resonant frequency and the blade amplitude, and provides a reliable basis for testing the service life of the blades.

[0020] 2. The first wire wheel and the second wire wheel are buffered by cables to reduce the influence of the vibrator on the tension sensor and maintain the stability of the overall structure.

[0021] The embodiments of the present invention are further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure in which the strain gauges of the present invention are distributed on the blades;

[0024] Figure 3 It is a left side view of the present invention;

[0025] Figure 4 For the present invention Figure 1 A partial enlarged view of the A-direction view;

[0026] Figure 5 For the present invention Figure 1 A partial enlarged view of the B direction view;

[0027] Among them: 1-support frame, 2-side mounting frame, 3-process sleeve, 4-mounting frame, 5-vibration component, 6-tension generating component, 7-strain gauge, 8-blade, 9-vibrator, 10-motor, 11-first wire wheel, 12-second wire wheel, 13-cable, 14-adapter, 15-tension sensor, 16-screw, 17-steering rod, 18-threaded sleeve, 19-upper mounting plate, 20-lower mounting plate, 21-outer frame, 22-clamping plate, 24-rotating shaft, 25-cross bar, 26-handle; DETAILED DESCRIPTION

[0028] like Figure 1-4As shown, the present invention provides a blade test bench, comprising a support frame 1, and a side mounting frame 2, a process sleeve 3, a mounting frame 4, a vibration assembly 5 and a tension generating assembly 6, which are sequentially distributed on the support frame 1 from left to right, and a strain gauge 7 arranged on a blade 8;

[0029] The blades 8 are distributed on both sides of the process sleeve 3, and the mounting end on one side of the blade 8 is fixedly connected to the process sleeve 3, and the counterweight end on the other side is clamped to the side mounting frame 2 / mounting frame 4;

[0030] The vibration assembly 5 includes a vibrator 9 and a motor 10 which are respectively connected to the mounting frame 4 and the support frame 1, and the output end of the motor 10 is connected to and drives the vibrator 9;

[0031] The tension generating assembly 6 includes a first reel 11, a second reel 12, a cable 13, an adapter 14, a tension sensor 15, a screw 16, a steering rod 17 and a threaded sleeve 18. The first reel 11 and the second reel 12 are respectively connected to both sides of the mounting frame 4 and the adapter 14, and the first reel 11 is connected to the second reel 12 by winding the cable 13. The adapter 14 is rotatably connected to the screw 16 through the tension sensor 15. The support frame 1 is rotatably connected to the threaded sleeve 18 for adjusting the tension of the blade 8 through the steering rod 17, and the threaded sleeve 18 is meshedly connected to the screw 16.

[0032] Combination Figure 5 As shown, in this embodiment, the process sleeve 3 includes an upper mounting plate 19 and a lower mounting plate 20, the mounting end of the blade 8 is fixedly connected between the upper mounting plate 19 and the lower mounting plate 20 by bolts, the side mounting frame 2 / mounting frame 4 includes an outer frame 21, a clamping plate 22 and an adjusting screw 23, the clamping plate 22 is slidably connected to the outer frame 21, the clamping plate 22 is threadedly connected with the adjusting screw 23, and the adjusting screw 23 abuts against the clamping plate 22, and the two ends of the outer frame 21 are provided with a rotating shaft portion 24, and the side mounting frame 2 / mounting frame 4 is connected to the outer frame 21 by a rotating shaft portion 24. The rotating shaft portion 24 is rotatably connected to the support frame 1 / the first wire wheel 11, the support frame 1 is provided with a cross bar 25, the cross bar 25 is connected to the steering rod 17 through a pin, the steering rod 17 is clamped with a threaded sleeve 18, and the threaded sleeve 18 is freely rotatable relative to the steering rod 17, and a handle portion 26 is provided on the side of the threaded sleeve 18, the paddle blades 8 are externally connected to strain gauges 7 distributed in a straight line, and a total of six groups of strain gauges 7 are installed on the two groups of paddle blades 8, and the strain gauges 7 are distributed on the same axis, and the interval between the strain gauges 7 on each group of paddle blades 8 is 100 mm.

[0033] The working principle of the present invention is that the counterweight end of the blade 8 is inserted into the clamping plate 22, and the blade 8 is clamped by rotating the adjusting screw 23, so that the blade 8 is installed on the side mounting frame 2 and the mounting frame 4. By rotating the threaded sleeve 18, a lateral pulling force is given to the blade 8, and the pulling force data is fed back by the pulling force sensor 15 to simulate the centrifugal force generated by the blade 8 during operation. By driving the motor 10, the vibrator 9 shakes the blade 8, and the strain gauge 7 feeds back the bending moment data generated by the deformation of the blade 8, which is used to feed back the relationship between the resonant frequency and the amplitude of the blade 8, and provide a reliable basis for testing the service life of the blade 8.

[0034] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A blade test bench, characterized in that: The invention comprises a support frame (1), and a side mounting frame (2), a process sleeve (3), a mounting frame (4), a vibration component (5), and a tension generating component (6) which are sequentially distributed on the support frame (1) from left to right, and a strain gauge (7) arranged on a blade (8); The blades (8) are distributed on both sides of the process sleeve (3), and the mounting end on one side of the blades (8) is fixedly connected to the process sleeve (3), and the counterweight end on the other side is clamped to the side mounting frame (2) / mounting frame (4); The vibration assembly (5) comprises a vibrator (9) and a motor (10) respectively connected to the mounting frame (4) and the supporting frame (1), wherein the output end of the motor (10) is connected to and drives the vibrator (9); The tension generating assembly (6) comprises a first wire wheel (11), a second wire wheel (12), a cable (13), an adapter (14), a tension sensor (15), a screw (16), a steering rod (17) and a threaded sleeve (18); the first wire wheel (11) and the second wire wheel (12) are respectively connected to the two sides of the mounting frame (4) and the adapter (14); the first wire wheel (11) is connected to the second wire wheel (12) by winding the cable (13); the adapter (14) is rotatably connected to the screw (16) through the tension sensor (15); the support frame (1) is rotatably connected to the threaded sleeve (18) for adjusting the tension of the blade (8) through the steering rod (17); and the threaded sleeve (18) is meshedly connected to the screw (16).

2. A blade test bench according to claim 1, characterized in that: The process sleeve (3) comprises an upper mounting plate (19) and a lower mounting plate (20), and the mounting end of the blade (8) is fixedly connected between the upper mounting plate (19) and the lower mounting plate (20) by means of bolts.

3. A blade test bench according to claim 1, characterized in that: The side mounting frame (2) / mounting frame (4) comprises an outer frame (21), a clamping plate (22) and an adjusting screw, wherein the clamping plate (22) is slidably connected to the outer frame (21), the clamping plate (22) is threadedly connected with the adjusting screw, and the adjusting screw abuts against the clamping plate (22).

4. A blade test bench according to claim 3, characterized in that: Rotating shafts (24) are provided at both ends of the outer frame (21), and the side mounting frame (2) / mounting frame (4) is rotatably connected to the supporting frame (1) / first wire wheel (11) via the rotating shafts (24).

5. The blade test bench according to claim 1, characterized in that: The support frame (1) is provided with a cross bar (25), the cross bar (25) is connected to a steering rod (17) via a pin, the steering rod (17) is clamped with a threaded sleeve (18), and the threaded sleeve (18) is freely rotatable relative to the steering rod (17), and a handle portion (26) is provided on the side of the threaded sleeve (18).

6. The blade test bench according to claim 1, characterized in that: The blade (8) is externally connected to a strain gauge (7) distributed in a straight line.

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