A high-speed operation test device for fan blades and a test method thereof

Abstract

A high-speed operation test device for fan blades and a test method thereof, the device includes a motor that provides high-speed rotation force to the fan blades, a main shaft bearing box, and a protective cover assembly that covers and shields the fan blades during high-speed rotation tests, a coupling is provided between the motor and the main shaft bearing box, the motor is directly connected to the main shaft bearing box through the coupling, the main shaft bearing box is provided with a tooling fixture for clamping the fan blades, and the tooling fixture is provided with a fastening assembly for fixing the fan blades. The device of the present invention meets the requirements for high-speed operation test to detect fan blades. After the fan blade product is operated at high speed, deformation, whitening, breakage, cracks and the like of the fan blade product are checked, and the damage at the fan blade shaft hole is checked, so as to judge the strength of the material and effectively detect the performance of the fan blade product.

Description

Technical Field

[0001] The present invention relates to a quality inspection device for fan blade products, in particular to a fan blade high-speed operation test device and a test method thereof, which are mainly used to inspect the material plasticity and toughness properties of fan blade products and are suitable for products such as axial flow fan blades and centrifugal fan blades. Background Art

[0002] Regarding the inspection standards for axial-flow and centrifugal fan blades, the centrifugal fan blades shall be inspected at 4 times the maximum speed of the motor under the operating speed, and the axial-flow fan blades shall be inspected at 3.5 times the maximum speed of the motor under the operating speed. The maximum continuous operating time is 100 hours.

[0003] For high-speed testing machine, if the speed is lower than 2000 rpm, take 2000 rpm, run continuously for 10 minutes, then increase the speed by 200 rpm every 20 seconds, and when the speed reaches above 2500 rpm, increase the speed by 100 rpm every 30 seconds until the wind wheel is damaged or the maximum speed of the equipment is reached, 4000 rpm. Run continuously for 10 minutes and stop the test if the wind wheel is not damaged.

[0004] The equipment has real-time running speed display, timed start and stop function, and speed adjustment knob. Two test modes: start and stop test and high-speed test. The two test modes can be switched freely, and both can realize forward, stop and reverse functions;

[0005] After the fan blade product runs at high speed, check the fan blade product for deformation, whitening, breakage, cracks, etc., and the damage at the fan blade shaft hole, so as to judge the strength of the material.

[0006] Based on the above requirements, a high-speed operation test equipment for axial flow and centrifugal fan blades is designed for quality inspection of fan blade products. Summary of the invention

[0007] The purpose of the present invention is to provide a high-speed operation test equipment and a test method for wind blades, which are safe to operate, have a reasonable structure, are capable of start-stop tests and high-speed experiments, and can effectively test the material plasticity and toughness properties of wind blade products, so as to overcome the shortcomings of the prior art.

[0008] A fan blade high-speed operation test equipment designed for this purpose includes a motor that provides high-speed rotational force to the fan blade, a main shaft bearing box, and a protective cover assembly that covers and shields the fan blade during the high-speed rotation test. A coupling is provided between the motor and the main shaft bearing box. The motor is directly connected to the main shaft bearing box through the coupling. The main shaft bearing box is provided with a tooling fixture for clamping the fan blade, and the tooling fixture is provided with a fastening assembly for fixing the fan blade.

[0009] The protective cover assembly includes a base, a protective cover A and a protective cover B which are slidably arranged on the base. The protective cover A and the protective cover B block or open the fan blades by sliding. In the direction in which the protective cover A and the protective cover B slide to open the fan blades, the base is provided with a safety travel switch for cooperating with the control motor to open and close.

[0010] Both protective cover A and protective cover B are provided with a plurality of ventilation holes.

[0011] A safety buckle assembly is provided between the protective cover A and the protective cover B. The protective cover A and the protective cover B shield the wind blades and are in a locked state through the safety buckle assembly.

[0012] The safety buckle assembly comprises a lock buckle rotatably arranged on the protective cover A, and a buckle pin fixedly arranged on the protective cover B. The lock buckle is provided with a limiting groove buckled with the buckle pin.

[0013] A proximity switch is provided on the outer side of the coupling, the fixture includes a sleeve connected to the main shaft bearing box, and a connecting sleeve inserted into the sleeve, the fan blade is provided with a connecting portion, the connecting sleeve is provided with a connecting shaft F passing through the connecting portion, the fastening assembly includes a locking piece which is sleeved on the connecting shaft F and clamps the connecting portion, the locking piece is provided with more than one notch, the connecting shaft F is provided with through holes corresponding to the notches, and the fastening assembly also includes a pin inserted into the notch and the through hole.

[0014] A plug-in assembly is provided between the sleeve and the spindle bearing box, and the sleeve is detachably mounted on the spindle bearing box through the plug-in assembly; the plug-in assembly includes a connecting shaft C arranged on one end of the spindle bearing box, and a plug-in cavity D arranged on the sleeve, and the connecting shaft C is inserted into the plug-in cavity D and fixedly connected by fasteners.

[0015] The coupling has a hollow structure. The motor is provided with an output shaft. A connecting shaft E is provided at the other end of the main shaft bearing box. The output shaft and the connecting shaft E are respectively inserted into the coupling. There is a gap between the output shaft and the connecting shaft E. A keyway and a key on the shaft are provided between the connecting shaft E and the coupling. The connecting shaft E and the coupling are assembled by aligning the key on the shaft with the keyway and fixed with fasteners. The fan blade high-speed operation test equipment also includes an electric control cabinet with an electrical control device, and a display screen showing the running speed of the motor.

[0016] A test method for a high-speed operation test device for a fan blade designed for this purpose includes the above-mentioned high-speed operation test device for a fan blade, and the motor is a variable frequency motor. The test method for the high-speed operation test device for a fan blade includes the following steps:

[0017] a. Clamp the fan blades on the fixture and lock the fan blades with the fastening components;

[0018] b. The protective covers A and B on both sides of the protective cover assembly are moved towards the fan blades and closed, and the safety buckle assembly is moved to put the protective covers A and B in a locked state;

[0019] c. Press the button on the electric control cabinet to start the motor, adjust the corresponding test speed according to the type and specification of the corresponding fan blades, and manually operate the frequency conversion speed knob to gradually increase the rotation speed of the frequency conversion motor output shaft from a low speed.

[0020] If during the test, the protective cover A and the protective cover B are in the open state, the contacts of the safety travel switch will also be disconnected; the test method includes a high-speed test, which includes the following steps: setting the operating time and operating speed on the equipment, the equipment continuously works at the set operating speed until the set operating time, and then increases the speed by 200 revolutions every 20 seconds. When the speed reaches more than 2500 revolutions, the speed is increased by 100 revolutions every 30 seconds until the fan blades are damaged; or, the equipment runs at 4000 revolutions to the set operating time. If the fan blades are not damaged, the test is stopped; the test method also includes a start-stop test, which includes the following steps: setting the start-stop time of the control motor on the equipment, and adjusting the operating speed of the motor through the frequency conversion speed regulation knob within the corresponding time. The motor on the equipment runs for a period of time and stops for a period of time. The stop time and running time of the motor are set by the user. During the operation of the equipment, the speed of the motor remains unchanged or gradually increases.

[0021] The beneficial effects of the present invention are as follows:

[0022] a. When the fan blades are being tested, they rotate in the protective cover assembly to prevent the blades from breaking and being thrown out to injure people.

[0023] b. The base of the protective cover assembly is equipped with a safety travel switch. When the fan blade is under test, the protective cover assembly opens suddenly, and the safety travel switch contacts are disconnected. This ensures that the variable frequency motor can only be started when the safety cover assembly is closed, thus achieving mechanical safety interlocking.

[0024] c. A safety buckle assembly is provided between the protective cover A and the protective cover B to prevent the protective cover A or the protective cover B from moving to one side when in the closed state.

[0025] d. The fixture includes a sleeve connected to the spindle bearing box and a connecting sleeve inserted into the sleeve. A plug-in assembly is provided between the sleeve and the spindle bearing box. The sleeve is detachably installed on the spindle bearing box through the plug-in assembly, thereby realizing rapid assembly and disassembly of the fixture.

[0026] e. A keyway and a key on the shaft are provided between the connecting shaft E and the coupling. The connecting shaft E and the coupling are assembled by the key on the shaft and the keyway and fixed with fasteners to eliminate the axial deviation and angular deviation of the main shaft center.

[0027] f. A proximity switch is installed on the outer side of the coupling to detect the rotation speed of the main shaft. There is a gap between the proximity switch and the coupling to prevent the coupling from touching the proximity switch, and the proximity switch has a long service life.

[0028] g. The fixture is provided with a fastening assembly for fixing the fan blades. The fastening assembly includes a locking piece and a latch. The latch is inserted into the locking piece to prevent the locking piece from loosening and running out during the rotation of the main shaft, thereby ensuring the stability and safety of the fan blades during high-speed rotation tests.

[0029] Through the above structure, the equipment meets the requirements of high-speed operation test for fan blades. After the fan blades are running at high speed, deformation, whitening, breakage, cracks and other phenomena on the fan blades are checked, as well as the damage at the shaft hole of the fan blades, so as to judge the strength of the material and effectively detect the performance of the fan blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of a protective cover assembly in an apparatus according to an embodiment of the present invention in an open state.

[0031] Figure 2 This is a schematic structural diagram of another orientation of a protective cover assembly in an apparatus according to an embodiment of the present invention in an open state.

[0032] Figure 3 This is a schematic diagram of a protective cover assembly in a device according to an embodiment of the present invention in a closed state.

[0033] Figure 4 for Figure 3 A partial enlarged view.

[0034] Figure 5 This is a structural schematic diagram of a device in one embodiment of the present invention, in which a motor, a spindle bearing box, a fixture and a coupling are arranged on a base.

[0035] Figure 6 This is a schematic diagram of another structural orientation of a motor, a spindle bearing box, a fixture and a coupling provided on a base in an embodiment of the present invention.

[0036] Figure 7 for Figure 6 A partial enlarged view.

[0037] Figure 8 This is a schematic cross-sectional structure diagram of a device in one embodiment of the present invention, in which a motor, a spindle bearing box, a fixture and a coupling are arranged on a base.

[0038] Fig. 9 It is a schematic diagram of the exploded structure of the motor, spindle bearing box, fixture and coupling assembly in the equipment of one embodiment of the present invention.

[0039] Fig.10 It is a schematic diagram of the exploded structure of the fixture assembly in the equipment of one embodiment of the present invention.

[0040] Fig.11 It is a schematic diagram of the assembly and decomposition structure of the coupling and the main shaft bearing box in the equipment of one embodiment of the present invention.

[0041] Fig.12 It is a schematic diagram of the exploded structure of the motor, the spindle bearing box and the base assembly in the equipment of one embodiment of the present invention.

[0042] Fig.13 It is a schematic diagram of the three-dimensional structure of the protective cover assembly in the equipment of one embodiment of the present invention.

[0043] In the figure, 1 is a fan blade, 1.1 is a connecting part, 2 is a motor, 2.1 is an output shaft, 2.2 is a connecting plate, 3 is a main shaft bearing box, 3.1 is a connecting shaft C, 3.2 is a connecting shaft E, 3.3 is a positioning plate, 4 is a coupling, 5 is a fixture, 6 is a base, 6.1 is a guide rail, 6.2 is a limit block, 7 is a protective cover A, 7.1 is a lock buckle, 7.2 is a limit groove, 7.3 is a toggle block, 7.4 is a support column, 7.5 is a positioning groove, 8 is a protective cover B, 8.1 is Snap-fit ​​pin, 9 is a safety travel switch, 10 is a vent hole, 11 is a sleeve, 11.1 is a plug-in cavity D, 11.2 is a plug-in cavity G, 12 is a connecting sleeve, 12.1 is a connecting shaft F, 12.2 is a through hole, 12.3 is a limit ring, 13 is a locking piece, 13.1 is a notch, 14 is a latch, 15 is an electric control cabinet, 16 is a proximity switch, 17 is a slider, 18 is an arc-shaped notch, 19 is a base, 19.1 is a support block, 19.2 is a support table, and 19.3 is a depression. DETAILED DESCRIPTION

[0044] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0045] See also Figure 1 A fan blade high-speed operation test equipment includes a motor 2 that provides high-speed rotation force to the fan blade 1, a main shaft bearing box 3, and a protective cover assembly that covers and shields the fan blade 1 during the high-speed rotation test. A coupling 4 is provided between the motor 2 and the main shaft bearing box 3. The motor 2 is directly connected to the main shaft bearing box 3 through the coupling 4. The main shaft bearing box 3 is provided with a fixture 5 for clamping the fan blade 1, and the fixture 5 is provided with a fastening assembly for fixing the fan blade 1.

[0046] See also Fig.13The protective cover assembly includes a base 6, a protective cover A 7 and a protective cover B8 slidably arranged on the base 6, and the protective cover A 7 and the protective cover B 8 block or open the fan blade 1 by sliding; in the direction in which the protective cover A 7 and the protective cover B 8 slide to open the fan blade 1, the base 6 is provided with a safety travel switch 9 for cooperating with the control motor 2 to open and close.

[0047] See also Figure 2 , Figure 3 ,as well as Fig.13 In this embodiment, the base 6 is provided with two cylindrical guide rails 6.1 which are arranged at intervals, and sliders 17 are respectively provided at the bottoms of the protective covers A 7 and B 8. The sliders 17 are provided with slide grooves, and the shapes of the slide grooves and the cylindrical guide rails 6.1 correspond to each other, so that the protective covers A 7 and B 8 are respectively slidably arranged on the base 6; in addition, the guide rails 6.1 are provided with limit blocks 6.2 for limiting the sliding positions of the protective covers A 7 and B 8, and a plurality of limit blocks 6.2 are provided, and limit blocks 6.2 are provided at the front and rear ends of each guide rail 6.1, and two limit blocks 6.2 are provided in the middle of each guide rail 6.1 corresponding to the protective covers A 7 and B8, and the two limit blocks 6.2 are arranged at intervals.

[0048] See also Figure 2 , Figure 3 ,as well as Fig.13 The protective cover A 7 and the protective cover B 8 are both provided with a plurality of air holes 10, so as to effectively guide the gas generated by the fan blade 1 when the fan blade 1 rotates at a high speed.

[0049] See also Figure 3 , Figure 4 A safety buckle assembly is provided between the protective cover A 7 and the protective cover B 8. The protective cover A 7 and the protective cover B 8 shield the wind blade 1 and are in a locked state through the safety buckle assembly. The protective cover A 7 and the protective cover B 8 are both provided with handles, which are fixed to the protective cover A 7 or the protective cover B 8 by welding or screws.

[0050] The safety buckle assembly comprises a lock buckle 7.1 rotatably arranged on the protective cover A 7, and a buckle pin 8.1 fixedly arranged on the protective cover B 8. The lock buckle 7.1 is provided with a limit groove 7.2 buckled with the buckle pin 8.1.

[0051] In this embodiment, the lock buckle 7.1 is rotatably arranged on the protective cover A7 through a rotating pin or a rotating shaft. The lock buckle 7.1 is in a long strip shape and a toggle block 7.3 is arranged on the lock buckle 7.1. The user grabs the toggle block 7.3 with his fingers and rotates the lock buckle 7.1 through the toggle block 7.3.

[0052] See also Figure 4A support column 7.4 is provided on the protective cover A 7 corresponding to the rotation track of the lock buckle 7.1, and a positioning groove 7.5 is provided on the lock buckle 7.1 corresponding to the support column 7.4. The positioning groove 7.5 abuts against the support column 7.4 through the rotation of the lock buckle 7.1, so that the lock buckle 7.1 can be fixed on the protective cover A 7 when it is stationary.

[0053] See also Figure 2 , Figure 5-Figure 7 A proximity switch 16 is provided on the outer side of the coupling 4, the fixture 5 includes a sleeve 11 connected to the main shaft bearing box 3, and a connecting sleeve 12 inserted into the sleeve 11, the fan blade 1 is provided with a connecting portion 1.1, the connecting sleeve 12 is provided with a connecting shaft F12.1 passing through the connecting portion 1.1, the fastening assembly includes a locking member 13 which is sleeved on the connecting shaft F12.1 and clamps the connecting portion 1.1, the locking member 13 is provided with more than one notch 13.1, the connecting shaft F12.1 is provided with a through hole 12.2 corresponding to the notch 13.1, and the fastening assembly also includes a pin 14 inserted into the notch 13.1 and the through hole 12.2.

[0054] In this embodiment, the locking member 13 is a locking nut, and a thread is provided between the locking nut and the connecting shaft F12.1, and the locking nut and the connecting shaft F12.1 are fixedly connected through the thread.

[0055] In this embodiment, the sleeve 11 is further provided with an insertion cavity G11.2, and the connecting sleeve 12 is inserted into the insertion cavity G11.2 (laterally locked with four screws, and screw holes for inserting screws are provided on the outside of the insertion cavity G11.2). A stop ring 12.3 is provided at the position where the connecting sleeve 12 is inserted into the insertion cavity G11.2, which abuts against the outside of the insertion cavity G11.2.

[0056] A plug-in assembly is provided between the sleeve 11 and the spindle bearing box 3, and the sleeve 11 is detachably installed on the spindle bearing box 3 through the plug-in assembly; the plug-in assembly includes a connecting shaft C 3.1 arranged on one end of the spindle bearing box 3, and a plug-in cavity D11.1 arranged on the sleeve 11, and the connecting shaft C 3.1 is inserted into the plug-in cavity D 11.1 and fixedly connected by fasteners (laterally locked with 4 screws, and screw holes for inserting screws are provided on the outer side of the plug-in cavity D11.1).

[0057] See also Figure 8The coupling 4 is hollow in structure, the motor 2 is provided with an output shaft 2.1, and the other end of the main shaft bearing box 3 is provided with a connecting shaft E 3.2. The output shaft 2.1 and the connecting shaft E 3.2 are respectively inserted into the coupling 4, and there is a gap between the output shaft 2.1 and the connecting shaft E 3.2. A keyway and a key on the shaft are provided between the connecting shaft E 3.2 and the coupling 4. The connecting shaft E 3.2 and the coupling 4 are assembled by aligning the key on the shaft with the keyway and fixed with fasteners. The fan blade high-speed operation test equipment also includes an electric control cabinet 15 provided with an electric control device, and a display screen for displaying the running speed of the motor 2.

[0058] In this embodiment, the protective cover A7 and the protective cover B8 are respectively provided with arc-shaped notches 18 corresponding to the connection axis F12.1 to form an airtight connection axis F12.1, so that the connection axis F12.1 relatively penetrates the other closed part of the protective cover A7 and the protective cover B8.

[0059] See also Fig.12 In this embodiment, the motor 2 and the spindle bearing box 3 are respectively fixed on the base 19, the base 19 is provided with a support block 19.1 and a support platform 19.2, the bottom of the motor 2 is provided with a connecting plate 2.2 fixed on the support block 19.1, the connecting plate 2.2 is fixed to the support block 19.1 by screws, the bottom of the spindle bearing box 3 is provided with a positioning plate 3.3, the support platform 19.2 is provided with a recess 19.3 corresponding to the positioning plate 3.3, and the positioning plate 3.3 is fixed in the recess 19.3 of the support platform 19.2 by screws.

[0060] A test method for a fan blade high-speed operation test device includes the above-mentioned fan blade high-speed operation test device, the motor 2 is a variable frequency motor, and the test method for the fan blade high-speed operation test device includes the following steps:

[0061] a. Clamp the fan blade 1 on the fixture 5, and lock the fan blade 1 by fastening the assembly;

[0062] b. The protective covers A7 and B8 on both sides of the protective cover assembly are moved towards the fan blade 1 and closed, and the safety buckle assembly is moved to put the protective covers A7 and B8 in a locked state;

[0063] c. Press the button on the electric control cabinet 15 to start the motor 2, adjust the corresponding test speed according to the type and specification of the corresponding fan blade 1, and manually operate the frequency conversion speed knob to gradually increase the rotation speed of the frequency conversion motor output shaft from a low speed.

[0064] If during the test, the protective cover A 7 and the protective cover B 8 are in a state of sudden opening, the contact of the safety travel switch 9 is also disconnected; the test method includes a high-speed test, which includes the following steps: setting the running time (such as 10 minutes) and the running speed (such as 2000 revolutions) on the equipment, the equipment continuously works at the set running speed until the set running time, and then increases the speed by 200 revolutions every 20 seconds, and when the speed reaches more than 2500 revolutions, increases the speed by 100 revolutions every 30 seconds until the fan blade 1 is damaged; or, the equipment runs at 4000 revolutions until the set running time, if the fan blade 1 is not damaged, the test is stopped; the test method also includes a start-stop test, which includes the following steps: setting the start-stop time of the control motor 2 on the equipment, and adjusting the running speed of the motor 2 by the frequency conversion speed knob within the corresponding time, the motor 2 on the equipment runs for a period of time and stops for a period of time, the stop time and running time of the motor 2 are set by the user, and the speed of the motor 2 remains unchanged or gradually increases during the operation of the equipment.

[0065] The above is a preferred embodiment of the present invention, which shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for illustrating the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A high-speed operation test device for a fan blade, comprising a motor (2) for providing a high-speed rotation force to a fan blade (1), characterized in that: It also includes a main shaft bearing box (3) and a protective cover assembly that covers and shields the fan blade (1) during a high-speed rotation test; a coupling (4) is provided between the motor (2) and the main shaft bearing box (3); the motor (2) and the main shaft bearing box (3) are directly connected to each other through the coupling (4) in a transmission structure; the main shaft bearing box (3) is provided with a fixture (5) for clamping the fan blade (1); and the fixture (5) is provided with a fastening assembly for fixing the fan blade (1); The protective cover assembly comprises a base (6), a protective cover A (7) and a protective cover B (8) slidably arranged on the base (6), wherein the protective cover A (7) and the protective cover B (8) block or open the fan blade (1) by sliding; in the direction in which the protective cover A (7) and the protective cover B (8) slide to open the fan blade (1), the base (6) is provided with a safety travel switch (9) for cooperating with the control motor (2) to open and close; The protective cover A (7) and the protective cover B (8) are both provided with a plurality of ventilation holes (10); A safety buckle assembly is provided between the protective cover A (7) and the protective cover B (8); the protective cover A (7) and the protective cover B (8) shield the fan blade (1) and are in a locked state through the safety buckle assembly.

2. The high-speed operation test equipment for wind blades according to claim 1 is characterized in that: The safety buckle assembly comprises a lock buckle (7.1) rotatably arranged on the protective cover A (7), and a buckle pin (8.1) fixedly arranged on the protective cover B (8); the lock buckle (7.1) is provided with a limit groove (7.2) buckled with the buckle pin (8.1).

3. The high-speed operation test equipment for wind blades according to claim 1, characterized in that: A proximity switch (16) is provided on an outer side of the coupling (4); the fixture (5) comprises a sleeve (11) connected to the main shaft bearing box (3) and a connecting sleeve (12) inserted into the sleeve (11); the fan blade (1) is provided with a connecting portion (1.1); the connecting sleeve (12) is provided with a connecting shaft F (12.1) penetrating the connecting portion (1.1); the fastening assembly comprises a locking member (13) sleeved on the connecting shaft F (12.1) and clamping the connecting portion (1.1); the locking member (13) is provided with one or more notches (13.1); the connecting shaft F (12.1) is provided with through holes (12.2) corresponding to the notches (13.1); and the fastening assembly further comprises a latch (14) inserted into the notches (13.1) and the through holes (12.2).

4. The high-speed operation test equipment for wind blades according to claim 3 is characterized in that: A plug-in assembly is provided between the sleeve (11) and the spindle bearing box (3), and the sleeve (11) is detachably mounted on the spindle bearing box (3) via the plug-in assembly; the plug-in assembly comprises a connecting shaft C (3.1) arranged on one end of the spindle bearing box (3), and a plug-in cavity D (11.1) arranged on the sleeve (11), and the connecting shaft C (3.1) is inserted into the plug-in cavity D (11.1) and fixedly connected via a fastener.

5. The high-speed operation test equipment for wind blades according to claim 4 is characterized in that: The coupling (4) has a hollow structure. The motor (2) is provided with an output shaft (2.1). The other end of the main shaft bearing box (3) is provided with a connecting shaft E (3.2). The output shaft (2.1) and the connecting shaft E (3.2) are respectively inserted into the coupling (4). A gap is provided between the output shaft (2.1) and the connecting shaft E (3.2). A keyway and a key on the shaft are provided between the connecting shaft E (3.2) and the coupling (4). The connecting shaft E (3.2) and the coupling (4) are assembled by aligning the key on the shaft with the keyway and are fixed by fasteners. The fan blade high-speed operation test equipment also includes an electric control cabinet (15) provided with an electric control device, and a display screen for displaying the running speed of the motor (2).

6. A test method for a high-speed operation test device for a fan blade, comprising the high-speed operation test device for a fan blade according to claim 5, characterized in that: The motor (2) is a variable frequency motor, and the test method of the fan blade high-speed operation test equipment comprises the following steps: a. Clamp the fan blade (1) on the fixture (5), and lock the fan blade (1) by means of a fastening assembly; b. The protective covers A (7) and B (8) on both sides of the protective cover assembly are moved toward the fan blade (1) and closed, and the safety buckle assembly is moved to put the protective covers A (7) and B (8) in a locked state; c. Press the button on the electric control cabinet (15) to start the motor (2) and adjust the corresponding test speed according to the type and specification of the fan blade (1). Manually operate the variable frequency speed knob to gradually increase the rotation speed of the variable frequency motor output shaft from a low speed.

7. The test method of the fan blade high-speed operation test equipment according to claim 6, characterized in that: If during the test, the protective cover A (7) and the protective cover B (8) are in an open state, the contact of the safety travel switch (9) is also disconnected. The test method includes a high-speed test, which includes the following steps: setting the running time and the running speed on the device, the device continuously operates at the set running speed until the set running time, and then increases the speed by 200 revolutions every 20 seconds. When the speed reaches more than 2500 revolutions, the speed is increased by 100 revolutions every 30 seconds until the fan blade (1) is damaged; or, the device operates at 4000 revolutions until the set running time. If the fan blade (1) is not damaged, the test is stopped. The test method also includes a start-stop test, which includes the following steps: setting the start-stop time of the control motor (2) on the device, and adjusting the running speed of the motor (2) by using the variable frequency speed knob within the corresponding time. The motor (2) on the device runs for a period of time and stops for a period of time. The stop time and running time of the motor (2) are set by the user. During the operation of the device, the speed of the motor (2) remains unchanged or gradually increases.

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