Fan blade angle measuring tool

Abstract

The invention relates to the technical field of angle measurement, and particularly discloses a fan blade angle measurement tool, which comprises a bracket, and is characterized in that the bracket is provided with a clamping assembly used for clamping and fixing a lug plate; the abutting detection module is used for abutting and detecting the surface curve of the blade; the feedback module is used for receiving and feeding back data detected by the abutting detection module; the abutting detection module comprises a detection box arranged on the support in the length direction of the blade in a sliding mode, multiple sets of abutting rods connected into the detection box in a sliding mode, a driving piece used for driving the abutting rods to be tightly attached to the blade, a shape memory plate arranged on the support and an adjusting assembly used for adjusting the shape memory plate. The method has the effect of improving the blade angle measurement efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of angle measurement, and in particular to a fan blade angle measurement tool. Background Art

[0002] A fan is a machine that relies on input mechanical energy to increase gas pressure and discharge gas. It is a driven fluid machine and there are many types of fans, such as centrifugal fans, axial flow fans, mixed flow fans, etc. Centrifugal fans include centrifugal ventilators, centrifugal blowers, centrifugal compressors, etc.

[0003] Blowers are widely used in household and industrial fields, such as vacuum cleaners, range hoods, industrial gas transportation, boiler combustion, factory ventilation, etc. Figure 4 The invention relates to an impeller of a centrifugal blower after assembling blades, wherein the blades include ear plates and blade plates. After the production of the blades is completed, the blades can be assembled after the naked eye observes that there is no obvious angle deviation, defect or other problems on the surface of the blades. After the impeller is assembled, the dynamic balance test can be performed. When the dynamic balance of the impeller is detected to be unqualified, the impeller angle and the impeller installation angle of the unqualified impeller need to be further tested by a universal angle ruler, such as the Chinese patent with the publication number CN222257994U. When dealing with a large number of blades to be tested, the measurement efficiency is low.

[0004] With respect to the above-mentioned related technologies, the inventors believe that the following defects exist: since it is necessary to perform dynamic balancing tests on the assembled impellers when conducting large-scale tests on the impeller angles, defective products found during the testing process need to be checked for various defects. When the defect is a problem with the blade angle, the defective blades need to be removed from the impeller, wasting manpower and material resources. If the blade angle is measured before assembly, it needs to be done manually using a universal angle ruler, which has low measurement efficiency and is more suitable for random inspections. Summary of the invention

[0005] In order to improve the problem of low blade angle measurement efficiency, the present application provides a fan blade angle measurement tool.

[0006] The fan blade angle measurement tool provided in this application adopts the following technical solution: A fan blade angle measuring tool comprises a bracket, on which is provided: A clamping assembly, used for clamping and fixing the ear plate; An abutment detection module, used for abutting and detecting the surface curve of the blade; A feedback module, used for receiving and feeding back the data detected by the abutment detection module; The abutment detection module includes a detection box slidably arranged on the bracket along the length direction of the blade, multiple sets of abutment rods slidably connected to the detection box, a driving member for driving the abutment rods to be close to the blade, a shape memory plate arranged on the bracket and an adjustment component for adjusting the shape memory plate.

[0007] By adopting the above technical solution, the ear plate of a standard blade is fixed by a clamping assembly, so that the pressing rod is pressed against the blade, and the shape memory plate can change in real time with the displacement of the pressing rod through the adjustment assembly, and then the detection box is moved from one end of the blade to the other end, so that a contour that matches the standard blade appears on the shape memory plate. Then the standard blade can be taken out, and the shape memory plate is shaped by the adjustment assembly, and then the blade to be measured can be clamped by the clamping assembly for measurement, that is, the detection box is moved to make the pressing rod move along the contour of the blade to be measured. In this process, the driving member makes the pressing rod always close to the blade, and the feedback module continuously monitors the degree of change between the pressing rod and the contour of the shape memory plate during the movement, and then infers the angle deviation between the blade being measured and the standard blade. This measurement process only needs to use the standard blade to determine the deformation of the shape memory plate at the beginning, and then fast and large-scale measurement can be performed, and the measurement efficiency is high.

[0008] Optionally, the adjustment component includes an adjustment box fixedly connected to the bracket, a solid-liquid phase change layer and a temperature control component placed in the adjustment box, the adjustment box is open on one side close to the shape memory plate, the shape memory plate is elastically pressed against the opening of the adjustment box, and the low-temperature deformable stability of the shape memory plate is higher than the melting temperature of the solid-liquid phase change layer.

[0009] By adopting the above technical solution, when the shape memory plate needs to be adjusted, the adjustment box is preheated by the temperature control component, so that the shape memory plate and the solid-liquid phase change layer are both at a higher temperature, and at this time the shape memory plate returns to its original straight state, and the solid-liquid phase change layer melts into liquid; then the temperature is lowered, so that the shape memory plate is in a low-temperature deformation state, and the solid-liquid phase change layer is still liquid. At this time, the standard blade is clamped, so that the clamping rod is squeezed by the standard blade plate and moves toward the direction close to the shape memory plate, and the corresponding part of the shape memory plate is squeezed into the bending angle of the standard blade, and then the detection box is slowly moved along the length direction of the blade to make the outline of the blade appear on the shape memory plate; finally, wait for further cooling to solidify the solid-liquid phase change layer to support the deformed shape memory plate, and then the angle of the blade to be measured can be measured.

[0010] Optionally, the temperature control component is a semiconductor thermoelectric sheet attached to the side wall of the regulating box.

[0011] By adopting the above technical solution, when the temperature of the regulating box needs to be increased or decreased, the cooling surface and the heating surface of the semiconductor thermal conductive sheet can be changed by controlling the direction of the current on the semiconductor thermal conductive sheet, so as to adjust the temperature of the regulating box more accurately and quickly.

[0012] Optionally, the driving member is a constant force coil spring rotatably disposed on the detection box and corresponding one-to-one with the clamping rod, the free end of the constant force coil spring is fixedly connected to one end of the clamping rod close to the shape memory plate, and the constant force coil spring is always in a stretched state.

[0013] By adopting the above technical solution, the constant force coil spring makes the clamping rod always press against the blade to be tested, so that the feedback module can more accurately detect the difference between the blade to be tested and the standard blade profile on the shape memory plate through the change of the clamping rod, thereby achieving the difference between the angle of the blade to be tested and the standard blade angle.

[0014] Optionally, the feedback module includes a displacement sensor and a probe-type pressure sensor disposed on the detection box, and the probe-type pressure sensor is disposed at one end of the abutting rod close to the shape memory plate.

[0015] By adopting the above technical solution, when the adjustment box is moved to measure the blade to be measured, the displacement sensor will provide real-time feedback on the position of the adjustment box, and the probe-type pressure sensor will detect the pressure between the clamping rod and the shape memory plate in real-time. When the data of the probe-type pressure sensor becomes smaller or larger, there will be a deviation between the angle of the blade to be measured and the standard blade, and the displacement sensor will provide feedback and record the specific position of the angle deviation.

[0016] Optionally, an elastic airbag is provided in the regulating box.

[0017] By adopting the above technical solution, when the solid-liquid phase change layer solidifies from liquid to solid, the elastic airbag always has a tendency to expand slightly, so that the liquid solid-liquid phase change layer always fits the shape memory plate until the solid-liquid phase change layer becomes solid and forms a tight support for the shape memory plate, thereby improving the stability of the shape memory plate during subsequent measurement operations.

[0018] Optionally, the bracket is provided with a pressing frame on a side of the shape memory plate away from the regulating box, the pressing frame elastically presses against the shape memory plate, and the area of ​​the shape memory plate is larger than the area of ​​the opening side of the regulating box.

[0019] By adopting the above technical solution, the pressing frame elastically presses against the shape memory plate, so that when the shape memory plate is in a deformed state, it is convenient for the shape memory plate to be recessed toward the regulating box, that is, there is relative movement between the shape memory plate and the pressing frame and there is a certain resistance. When the shape memory plate rebounds, the shape memory plate can overcome the resistance on the pressing frame and smoothly expand into a straight state.

[0020] Optionally, the clamping assembly includes two electric clamps respectively arranged at two ends of the bracket, and at least one of the electric clamps is slidably connected to the bracket.

[0021] By adopting the above technical solution, the distance between the two electric clamps is adjusted, so that the standard blade or the blade to be tested can be placed on the electric clamp for clamping to complete the fixation of the blade. The structure is simple, the operation is easy, and the clamping and removal process takes a short time.

[0022] In summary, the present application includes at least one of the following beneficial technical effects: 1. Fix the ear plate of a standard blade through the clamping assembly so that the clamping rod is pressed against the blade. At the same time, the shape memory plate can change in real time with the displacement of the clamping rod through the adjustment assembly. Move the detection box from one end of the blade to the other end, so that a contour matching the standard blade appears on the shape memory plate. Then the standard blade can be taken out, and the shape memory plate can be shaped through the adjustment assembly. Then the blade to be measured can be clamped by the clamping assembly, and then the detection box is moved to move the clamping rod along the contour of the blade to be measured. In this process, the driving member makes the clamping rod always close to the blade, and the feedback module continuously monitors the degree of change between the clamping rod and the contour of the shape memory plate during the movement, so as to infer the angular deviation between the blade being measured and the standard blade. In this measurement process, only the deformation of the shape memory plate can be determined by using the standard blade at the beginning, and then fast and large-scale measurement can be carried out, with high measurement efficiency. 2. When the shape memory plate needs to be deformed, the solid-liquid phase change layer only needs to be melted into liquid, so that the shape memory plate can be deformed more conveniently. The expansion trend of the elastic airbag also makes the liquid phase change layer always fit the shape memory plate. When the shape memory plate does not need to be deformed, the solid-liquid phase change layer only needs to be cooled into a solid to support the shape memory plate. The structure is relatively simple and the shape adaptation effect is better. 3. When the adjustment box is moved to measure the blade to be tested, the displacement sensor will provide real-time feedback on the position of the adjustment box, and the probe-type pressure sensor will detect the pressure between the clamping rod and the shape memory plate in real time. When the data of the probe-type pressure sensor becomes smaller or larger, there will be a deviation between the angle of the blade to be tested and the standard blade, and the displacement sensor will feedback and record the specific position of the angle deviation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 is along Figure 1 Schematic diagram of the cross-sectional structure along the AA line; Figure 3 yes Figure 2A magnified schematic diagram of part B; Figure 4 It is a structural schematic diagram of the impeller in this application.

[0024] Figure numerals: 1. bracket; 2. electric clamp; 31. detection box; 32. clamping rod; 33. driving member; 34. shape memory plate; 35. adjustment component; 351. adjustment box; 352. solid-liquid phase change layer; 353. temperature control member; 4. feedback module; 41. displacement sensor; 42. probe pressure sensor; 5. elastic airbag; 6. pressure frame; 71. blade; 72. ear plate. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1-4 This application is described in further detail.

[0026] The present application embodiment discloses a fan blade angle measuring tool. Figure 1 , Figure 2 and Figure 3 The fan blade angle measuring tool comprises a bracket 1, on which are arranged: a clamping assembly for clamping and fixing an ear plate 72; a pressing detection module for pressing and detecting a blade surface curve; a feedback module 4 for receiving and feeding back data detected by the pressing detection module; the pressing detection module comprises a detection box 31 slidably connected to the bracket 1 along the length direction of the blade, a plurality of pressing rods 32 slidably connected in the detection box 31, a driving member 33 for driving the pressing rods 32 to be close to the blade, a shape memory plate 34 arranged on the bracket 1, and an adjusting assembly 3 for adjusting the shape memory plate 34. 5. A motor is fixedly connected to the bracket 1 and a screw is rotatably connected thereto. The output end of the motor is fixedly connected to the screw. The detection box 31 is also threadedly connected to the screw. There are no less than two rows of clamping rods 32. The specific number of the clamping rods 32 depends on the size of the blades in the actual working conditions, and the adjacent rows of clamping rods 32 are arranged in an interlaced manner. The shape memory plate 34 can be a nickel-titanium alloy plate, which is easily deformed by external force at low temperatures and has extremely low resilience, but recovers its original shape at high temperatures. The shape memory plate 34 of the present application has a low-temperature deformable temperature of 55°C and a high-temperature recovery temperature of 80°C.

[0027] The ear plate 72 of a standard blade is fixed by the clamping assembly, so that the pressing rod 32 is pressed against the blade 71, and the shape memory plate 34 can change in real time with the displacement of the pressing rod 32 by the adjusting assembly 35, and then the detection box 31 is moved from one end of the blade 71 to the other end, so that a contour matching the standard blade 71 appears on the shape memory plate 34. Then the standard blade can be taken out, and the shape memory plate 34 is shaped by the adjusting assembly 35, and then the blade to be measured can be clamped by the clamping assembly for measurement, that is, the detection box 31 is moved to make the pressing rod 32 move along the contour of the blade to be measured, and in this process, the driving member 33 makes the pressing rod 32 always close to the blade 71, and the feedback module 4 continuously monitors the degree of change between the pressing rod 32 and the contour of the shape memory plate 34 during the movement, and then infers the angle deviation between the blade 71 being measured and the standard blade 71, that is, the angle change of the blade to be measured is indirectly judged by measuring the deformation amount between the blade to be measured and the standard blade. The measurement process only needs to use a standard blade to determine the deformation of the shape memory plate 34 at the beginning, and then a fast and large-scale measurement can be performed with high measurement efficiency.

[0028] Reference Figure 2 The adjustment component 35 includes an adjustment box 351 fixedly connected to the bracket 1, a solid-liquid phase change layer 352 placed in the adjustment box 351, and a temperature control component 353. The adjustment box 351 is open on one side close to the shape memory plate 34, and the shape memory plate 34 elastically presses against the opening of the adjustment box 351. The solid-liquid phase change layer 352 can be a phase change material such as paraffin, paraffin / polymer composite material, etc. The strength of the paraffin / polymer composite material is higher when it is in a solid state, but the cost is higher than that of paraffin. The specific selection depends on the specific working conditions, and the low-temperature deformable temperature of the shape memory plate 34 is higher than the melting temperature of the solid-liquid phase change layer 352.

[0029] When the shape memory plate 34 needs to be adjusted, the temperature control component 353 is used to preheat the adjustment box 351, so that the shape memory plate 34 and the solid-liquid phase change layer 352 are both at a higher temperature, and at this time the shape memory plate 34 returns to its original straight state and the solid-liquid phase change layer 352 melts into liquid; then the temperature is lowered so that the shape memory plate 34 is in a low-temperature deformation state and the solid-liquid phase change layer 352 is still liquid. At this time, the standard blade is clamped so that the clamping rod 32 is squeezed by the standard blade 71 and moves toward the direction close to the shape memory plate 34, and the corresponding part of the shape memory plate 34 is squeezed into the bending angle of the standard blade, and then the detection box 31 is slowly moved along the length direction of the blade so that the outline of the blade 71 appears on the shape memory plate 34; finally, wait for further cooling to solidify the solid-liquid phase change layer 352 to support the deformed shape memory plate 34, and then the angle of the blade to be measured can be measured.

[0030] Reference Figure 1The temperature control element 353 may be a semiconductor thermoelectric sheet attached to the side wall of the regulating box 351, a heating rod or a heat exchange pipe penetrating the regulating box 351. In the present application, the temperature control element 353 is a semiconductor thermoelectric sheet. When the regulating box 351 needs to be heated up or cooled down, the cooling surface and the heating surface of the semiconductor thermoelectric sheet can be changed by controlling the current direction on the semiconductor thermoelectric sheet, so as to adjust the temperature of the regulating box 351 more accurately and quickly.

[0031] Reference Figure 2 and Figure 3 The driving member 33 is a constant force coil spring that is rotatably arranged on the detection box 31 and corresponds to the clamping rod 32 one by one. The free end of the constant force coil spring is fixedly connected to one end of the clamping rod 32 close to the shape memory plate 34, and the constant force coil spring is always in a stretched state. The constant force coil spring makes the clamping rod 32 always press against the blade 71 to be tested, so that the feedback module 4 can more accurately detect the difference between the contour of the blade 71 to be tested and the standard blade 71 on the shape memory plate 34 through the change of the clamping rod 32, thereby achieving the difference between the angle of the blade 71 to be tested and the angle of the standard blade 71.

[0032] Reference Figure 1 The feedback module 4 includes a displacement sensor 41 and a probe pressure sensor 42 arranged on the detection box 31. The probe pressure sensor 42 is fixedly connected to one end of the clamping rod 32 close to the shape memory plate 34. The probe pressure sensor 42 can also be replaced by a patch pressure sensor pasted on one end of the clamping rod 32 close to the shape memory plate 34, or a multi-contact pressure sensor arranged on the detection box 31, and each contact of the multi-contact pressure sensor is respectively pasted on the end of each clamping rod 32.

[0033] When the adjustment box 351 is moved to measure the blade 71 to be measured, the displacement sensor 41 provides real-time feedback of the position of the adjustment box 351, and the probe-type pressure sensor 42 detects the pressure between the clamping rod 32 and the shape memory plate 34 in real time. When the clamping rod 32 detects that a certain part of the blade 71 protrudes toward the end away from the shape memory plate 34, the constant force coil spring pulls up the clamping rod 32, and the data of the probe-type pressure sensor 42 decreases. When the clamping rod 32 detects that a certain part of the blade 71 protrudes toward the end close to the shape memory plate 34, the data of the pressure sensor increases, and when the clamping rod 32 continues to move forward under a large external force, the probe-type pressure sensor 42 will undergo a slight deformation, thereby allowing the clamping rod 32 to move smoothly. That is, when the data of the probe pressure sensor 42 becomes smaller or larger, there is a deviation between the angle of the blade 71 to be tested and the standard blade 71, and the displacement sensor 41 feeds back and records the specific position of the angle deviation. The setting of the clamping rod 32 is more suitable for working conditions where the angle deviation of the blade 71 is small, such as working conditions where there is no obvious angle deviation when observed with the naked eye.

[0034] In other feasible embodiments, when measuring larger or older blades with larger angle changes, a clamping rod 32 can be set to two sections, and the two sections of the clamping rod 32 are connected by an elastic pad with a higher elastic modulus, that is, when there is a deviation between the angle of the blade 71 to be measured and the standard blade 71 and the distance between the blade 71 to be measured and the memory alloy plate is less than the length of the clamping rod 32, the elastic pad is squeezed so that the clamping rod 32 can move smoothly, and the data of the probe pressure sensor 42 still increases; and in the process of contouring the standard blade 71 at the forming part of the shape memory plate 34, due to the large elastic modulus of the elastic pad, the hardness is relatively high, and in this process the solid-liquid phase change layer 352 is still in a liquid state and cannot provide strong support for the shape memory plate 34. Therefore, when the shape memory plate 34 is deformed to the contour of the standard blade 71, the system of the clamping rod 32 and the elastic pad can be regarded as a rigid rod, which can shrink slightly when a large external force occurs. When testing a larger blade, the abutting rod 32 is an elastic telescopic rod, and a mechanical structure or an electric structure for locking the telescopic part of the abutting rod 32, such as a latch, is also installed on the abutting rod 32.

[0035] Reference Figure 2 , an elastic airbag 5 is arranged in the regulating box 351. When the solid-liquid phase change layer 352 solidifies from liquid to solid, the elastic airbag 5 always has a tendency to expand slightly, so that the liquid solid-liquid phase change layer 352 always adheres to the shape memory plate 34 but is not enough to make the shape memory plate 34 rebound, until the solid-liquid phase change layer 352 is solid to form a tight support for the shape memory plate 34, thereby improving the stability of the shape memory plate 34 during subsequent measurement operations.

[0036] Reference Figure 2 The bracket 1 is provided with a pressing frame 6 on the side of the shape memory plate 34 away from the adjustment box 351. A pressing pad that is pressed against the shape memory plate 34 is fixedly connected to one end of the pressing frame 6 close to the shape memory plate 34. The area of ​​the shape memory plate 34 is larger than the area of ​​the opening side of the adjustment box 351. A limiting frame that matches the shape memory plate 34 in the initial shape is also fixedly connected to one end of the pressing frame 6 close to the adjustment box 351. When the shape memory plate 34 is in a deformed state, the shape memory plate 34 and the pressing frame 6 move relative to each other and there is a certain resistance. When the shape memory plate 34 rebounds, the shape memory plate 34 can overcome the resistance on the pressing frame 6 and expand smoothly into a straight shape.

[0037] Reference Figure 2The clamping assembly includes two electric clamps 2 respectively arranged at the two ends of the bracket 1, and at least one electric clamp 2 is slidably connected to the bracket 1. In the present application, one electric clamp 2 is fixed and the other is slidably connected to the bracket 1, and the sliding process of the slidably connected electric clamp 2 is driven by a motor screw structure. The distance between the two electric clamps 2 is adjusted so that the standard blade or the blade to be tested can be placed on the electric clamp 2 for clamping to complete the fixing of the blade. The structure is simple and easy to operate, and the clamping and unloading process is time-consuming, and it can adapt to blades of more sizes. In other feasible embodiments, the electric clamp 2 can also be a torsion spring clamp, a buckle or the like, and the movement mode of the clamping assembly and the adjustment box 351 is manual.

[0038] The implementation principle of a fan blade angle measurement tooling in the embodiment of the present application is as follows: adjust the distance between the two electric clamps 2 to match the standard blade, fix the ear plate 72 of a standard blade by the electric clamp 2, make the pressing rod 32 press against the blade plate 71, control the temperature by the temperature control component 353, make the shape memory plate 34 in a low-temperature deformation state, and make the solid-liquid phase change layer 352 liquid, so that the pressing rod 32 is squeezed by the standard blade plate 71 and moves in the direction close to the shape memory plate 34, and squeezes the corresponding part of the shape memory plate 34 into the bending angle of the standard blade, and then slowly moves the detection box 31 along the length direction of the blade, so that the outline of the blade plate 71 appears on the shape memory plate 34; finally, wait for further cooling to solidify the solid-liquid phase change layer 352 to support the deformed shape memory plate 34; Take out the standard blade, clamp the blade to be measured by the electric clamp 2, move the detection box 31 to make the clamping rod 32 move along the contour of the blade to be measured, and during this process, the driving member 33 makes the clamping rod 32 always close to the blade plate 71, and the probe-type pressure sensor 42 continuously monitors the degree of change between the clamping rod 32 and the contour of the shape memory plate 34 during the movement, and then infers the angular deviation between the blade 71 being measured and the standard blade 71.

[0039] 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 fan blade angle measuring tool, characterized in that: The invention comprises a bracket (1), wherein the bracket (1) is provided with: A clamping assembly, used for clamping and fixing the ear plate (72); An abutment detection module, used for abutting and detecting the surface curve of the blade; A feedback module (4) is used to receive and feed back data detected by the abutment detection module; The abutment detection module comprises a detection box (31) slidably arranged on the bracket (1) along the length direction of the blade, a plurality of abutment rods (32) slidably connected to the detection box (31), a driving member (33) for driving the abutment rods (32) to be closely attached to the blade, a shape memory plate (34) arranged on the bracket (1), and an adjustment component (35) for adjusting the shape memory plate (34).

2. The fan blade angle measuring tool according to claim 1, characterized in that: The regulating component (35) comprises a regulating box (351) fixedly connected to the bracket (1), a solid-liquid phase change layer (352) and a temperature control component (353) placed in the regulating box (351); the regulating box (351) has an opening on one side close to the shape memory plate (34); the shape memory plate (34) elastically presses against the opening of the regulating box (351); and the low-temperature deformable temperature of the shape memory plate (34) is higher than the melting temperature of the solid-liquid phase change layer (352).

3. The fan blade angle measuring tool according to claim 2, characterized in that: The temperature control component (353) is a semiconductor thermoelectric sheet attached to the side wall of the regulating box (351).

4. The fan blade angle measuring tool according to claim 1, characterized in that: The driving member (33) is a constant force coil spring rotatably arranged on the detection box (31) and corresponding one-to-one with the clamping rod (32); the free end of the constant force coil spring is fixedly connected to one end of the clamping rod (32) close to the shape memory plate (34); and the constant force coil spring is always in a stretched state.

5. The fan blade angle measuring tool according to claim 1, characterized in that: The feedback module (4) comprises a displacement sensor (41) and a probe-type pressure sensor (42) arranged on the detection box (31); the probe-type pressure sensor (42) is arranged at one end of the abutting rod (32) close to the shape memory plate (34).

6. The fan blade angle measuring tool according to claim 2, characterized in that: An elastic air bag (5) is arranged inside the regulating box (351).

7. The fan blade angle measuring tool according to claim 2, characterized in that: The bracket (1) is provided with a pressing frame (6) on a side of the shape memory plate (34) away from the regulating box (351), the pressing frame (6) elastically pressing against the shape memory plate (34), the area of ​​the shape memory plate (34) being larger than the area of ​​the opening side of the regulating box (351).

8. The fan blade angle measuring tool according to claim 1, characterized in that: The clamping assembly comprises two electric clamping jaws (2) respectively arranged at two ends of the bracket (1), and at least one of the electric clamping jaws (2) is slidably connected to the bracket (1).

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