A device and method for real-time measurement of blade angle of electric variable pitch propeller

Abstract

The present invention relates to the field of blade testing, and in particular to a device and method for real-time angle measurement of an electric variable pitch propeller blade. The measuring device includes a blade, which is assembled and connected to the blade root, and a sliding pin is eccentrically arranged on the end face of the blade root; a measuring component, which includes an incomplete gear, a transmission gear and an angle sensor. The incomplete gear is fixedly sleeved and arranged on the blade root, and the transmission gear is meshed with the incomplete gear. A gear shaft is fixedly arranged inside the transmission gear, and the angle sensor is fixedly arranged on a mounting plate and used to measure the angle change of the gear shaft. The present invention can realize the real-time monitoring process of the blade angle change process, the transmission process is reliable and stable, the blade angle measurement is accurate, and the practicability is strong. At the same time, the pitch adjustment range of the movable block can be accurately calibrated to improve the measurement accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of blade testing, and in particular to a device and method for real-time measuring the angle of a blade of an electric variable pitch propeller. Background Art

[0002] The propeller pitch control device controls the propeller to work at the optimal blade angle under various working conditions of the engine and the aircraft, so as to achieve the best working efficiency of the propeller. Since the flight environment of the aircraft is very complex, it is a permanent topic to study the propeller pitch control device so that it can more accurately control the blade angle and achieve the best output efficiency of the propeller. Therefore, it is necessary to monitor the working propeller blade angle in real time and collect the blade angle in time in order to study the relationship between the blade angle and the propeller speed and engine power, and then study a better propeller pitch control device. At present, the accuracy of propeller blade angle measurement needs to be improved, and the measurement device needs to be improved urgently. Summary of the invention

[0003] The purpose of the present invention is to provide a device and method for real-time measurement of the blade angle of an electric variable pitch propeller, aiming to solve the above-mentioned technical problems.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] A device for real-time measurement of blade angle of electric variable pitch propeller, comprising:

[0006] The blade is assembled and connected to the blade root, and a sliding pin is eccentrically arranged on the end surface of the blade root.

[0007] A measuring component, the measuring component includes an incomplete gear, a transmission gear and an angle sensor, the incomplete gear is fixedly sleeved on the propeller root, the transmission gear is meshed with the incomplete gear, a gear shaft is fixedly arranged inside the transmission gear, and the angle sensor is fixedly arranged on the mounting plate and is used to measure the angle change of the gear shaft.

[0008] A support seat, wherein the support seat is arranged on one side of the propeller root.

[0009] A movable block is provided with a sliding groove at one end of the movable block close to the sliding pin, a sliding sleeve is fixedly provided on the inner wall of the sliding groove, and the sliding pin is adapted to be slidably installed in the sliding sleeve.

[0010] The driving part is used to drive the movable block to move up and down in a straight line.

[0011] An electric slip ring is arranged at the bottom of the support seat and is used for electric signal transmission.

[0012] The correction component includes a correction sleeve, an upper screw and a lower screw. The correction sleeve is fixedly arranged inside the movable block. The upper screw and the lower screw are respectively threadedly installed at the upper and lower ends of the support seat. The correction component is used to calibrate the adjustment range of the movable block.

[0013] As a further solution of the present invention: the incomplete gear is a sector gear, and the sector gear is 1 / 3 of the circumference.

[0014] As a further solution of the present invention: the driving part includes a pitch-adjusting motor, a pitch-adjusting screw and a screw sleeve, the pitch-adjusting motor is fixedly arranged on the top of the support seat, the output end of the pitch-adjusting motor is connected to the reducer, the output end of the reducer is connected to the top of the pitch-adjusting screw, the bottom end of the pitch-adjusting screw is rotatably matched with the support seat, the screw sleeve is fixedly arranged inside the movable block, and the pitch-adjusting screw thread passes through the screw sleeve.

[0015] As a further solution of the present invention: rotating bearings are provided at the connection points between the upper and lower ends of the pitch-adjusting screw and the support seat.

[0016] As a further solution of the present invention: limiting grooves are arranged on the inner walls on both sides of the support seat, limiting sliding blocks are arranged at both ends of the movable block, and the limiting sliding blocks are adapted to be slidably installed in the limiting grooves.

[0017] As a further solution of the present invention: the interior of the correction sleeve is divided into two upper and lower chambers, and linear motion ball bearings are arranged on the inner walls of the chambers, an upper pressure block is slidably arranged inside the upper chamber, and a lower pressure block is slidably arranged inside the lower chamber, an upper correction hole is arranged at the bottom of the upper chamber, a first electrode ring is arranged on the inner wall of the upper correction hole, a lower correction hole is arranged at the top of the lower chamber, and a second electrode ring is arranged on the inner wall of the lower correction hole.

[0018] As a further solution of the present invention: a conical surface sealing portion is arranged on the top of the upper pressure block, a correction contact rod corresponding to the upper correction hole is fixedly arranged on the bottom of the upper pressure block, an extrusion spring is arranged between the bottom of the upper pressure block and the correction sleeve, an upper pressure rod is extended from the bottom of the upper screw rod, and the upper pressure rod passes through the top end of the correction sleeve and abuts against the conical surface sealing portion.

[0019] As a further solution of the present invention: the lower pressing block has the same structure as the upper pressing block and is symmetrically arranged up and down, and the lower screw rod has the same structure as the upper screw rod and is symmetrically arranged up and down.

[0020] The present invention also provides a method for real-time measurement of the angle of an electric variable pitch propeller blade, using the above-mentioned device for real-time measurement of the angle of an electric variable pitch propeller blade, comprising the following steps:

[0021] Step 1: Range calibration: Before measuring, turn and adjust the upper screw and the lower screw to the specified position respectively, and calibrate the pitch adjustment range of the movable block with the correction sleeve to make the pitch adjustment range consistent with the maximum range of the blade's variable angle;

[0022] Step 2: The blade angle is changed by driving the movable block to move up and down in a straight line through the driving part, and the sliding sleeve and the sliding pin are used to drive the blade root to rotate to achieve the change of the blade angle;

[0023] Step three, angle measurement. The rotation of the propeller root will synchronously drive the incomplete gear to rotate, and the incomplete gear will drive the transmission gear to rotate. The angle sensor is used to measure the angle change of the gear shaft in real time.

[0024] Beneficial effects of the present invention:

[0025] (1) By setting up a measuring component, during the measurement process, the driving part drives the movable block to move up and down in a straight line. By utilizing the sliding cooperation between the sliding sleeve and the sliding pin, the movable block will drive the propeller root to rotate, thereby realizing the blade angle change process. At the same time, the incomplete gear will rotate with the blade angle change, and the incomplete gear will drive the transmission gear to rotate. The angle sensor is used to collect and measure the rotation tooth number signal of the transmission gear, and the data signal is transmitted to the background processor through the electric slip ring. The background processor processes the received signal into the rotation angle of the blade, thereby realizing the real-time monitoring process of the blade angle change process. The transmission process is reliable and stable, the blade angle measurement is accurate, and the practicability is strong.

[0026] (2) By setting up the correction component, the upper pressure rod will gradually pass through the correction sleeve and abut against the conical sealing part, and push the upper pressure block gradually close to the upper correction hole until the correction contact rod is aligned and inserted into the upper correction hole. The correction contact rod contacts the first electrode ring and is energized. Receiving the electrical signal indicates that the movable block has reached the initial measurement position at the top. Similarly, during the measurement process, the lower pressure rod on the lower screw rod will also push the lower pressure block. When the second electrode ring is energized, it indicates that the movable block has reached the final measurement position at the bottom, so that the one-way stroke of the movable block matches the maximum rotation angle of the incomplete gear, and then the adjustable distance range of the movable block can be accurately calibrated, and the adjustable distance range can be finely controlled by rotating and adjusting the upper screw rod and the lower screw rod, so as to improve the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] Figure 1 It is a structural schematic diagram of the present invention.

[0029] Figure 2 It is a schematic diagram of the structure of the measuring component in the present invention.

[0030] Figure 3It is a structural schematic diagram of the movable block in the present invention.

[0031] Figure 4 It is a schematic diagram of the internal structure of the movable block in the present invention.

[0032] Figure 5 It is a structural schematic diagram of the correction component in the present invention.

[0033] Figure 6 yes Figure 5 A schematic diagram of the enlarged structure at point A in the middle.

[0034] Figure 7 It is a structural schematic diagram of the upper pressing block in the present invention.

[0035] In the figure: 1. blade; 2. blade root; 21. sliding pin; 3. incomplete gear; 4. transmission gear; 5. gear shaft; 6. angle sensor; 7. support seat; 71. limit groove; 8. movable block; 81. sliding groove; 82. sliding sleeve; 83. limit slider; 9. driving part; 91. pitch-adjusting motor; 92. reducer; 93. pitch-adjusting screw; 94. screw sleeve; 95. rotating bearing; 10. electric slip ring; 11. correction sleeve; 111. linear motion ball bearing; 112. upper pressure block; 1121. conical sealing part; 1122. extrusion spring; 1123. correction contact rod; 113. lower pressure block; 114. upper correction hole; 1141. first electrode ring; 115. lower correction hole; 1151. second electrode ring; 12. upper screw; 121. upper pressure rod; 13. lower screw. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] See also Figure 1-Figure 3 As shown, the present invention is a real-time measuring device for the blade angle of an electric variable pitch propeller, comprising:

[0038] The blade 1 is assembled and connected to the blade root 2, and a sliding pin 21 is eccentrically arranged on the end surface of the blade root 2.

[0039] The measuring component includes an incomplete gear 3, a transmission gear 4 and an angle sensor 6. The incomplete gear 3 is fixedly sleeved on the propeller root 2, the transmission gear 4 is meshed with the incomplete gear 3, a gear shaft 5 is fixedly set inside the transmission gear 4, and the angle sensor 6 is fixedly set on the mounting plate and is used to measure the angle change of the gear shaft 5.

[0040] The support seat 7 is arranged on one side of the propeller root 2.

[0041] The movable block 8 has a sliding groove 81 at one end of the movable block 8 close to the sliding pin 21 . A sliding sleeve 82 is fixedly provided on the inner wall of the sliding groove 81 . The sliding pin 21 is adapted to be slidably installed in the sliding sleeve 82 .

[0042] Specifically, the inner wall surface of the sliding sleeve 82 is relatively smooth, so that the friction resistance between it and the sliding pin 21 is relatively small. The movable block 8 will transfer the load to the sliding pin 21 through the sliding sleeve 82 during the linear motion process.

[0043] The driving part 9 is used to drive the movable block 8 to perform vertical linear motion.

[0044] The electric slip ring 10 is arranged at the bottom of the support seat 7 and is used for transmitting electric signals.

[0045] Specifically, the electric slip ring 10 includes a rotating inner shaft and a fixed outer cylinder. The rotating inner shaft is rotatably installed in the fixed outer cylinder. The rotating inner shaft still maintains the power supply function during the rotation process to achieve rotational power supply and communication.

[0046] The correction component includes a correction sleeve 11, an upper screw 12 and a lower screw 13. The correction sleeve 11 is fixedly arranged inside the movable block 8. The upper screw 12 and the lower screw 13 are respectively threadedly installed at the upper and lower ends of the support seat 7. The correction component is used to calibrate the adjustment range of the movable block 8.

[0047] Specifically, by setting a measuring component, during the measuring process, the driving part 9 drives the movable block 8 to make an up and down linear motion. By utilizing the sliding cooperation between the sliding sleeve 82 and the sliding pin 21, the movable block 8 will drive the blade root 2 to rotate, thereby realizing the angle change process of the blade 1. At the same time, the incomplete gear 3 will rotate with the angle change of the blade 1, and the incomplete gear 3 will drive the transmission gear 4 to rotate. The angle sensor 6 is used to collect and measure the rotation tooth number signal of the transmission gear 4, and the data signal is transmitted to the background processor through the electric slip ring 10. The background processor processes the received signal into the rotation angle of the blade 1, thereby realizing the real-time monitoring process of the angle change process of the blade 1. The transmission process is reliable and stable, the angle measurement of the blade 1 is accurate, and the practicability is strong.

[0048] like Figure 2 As shown, the incomplete gear 3 is a sector gear, and the sector gear is 1 / 3 of the circumference.

[0049] Specifically, the angle of the incomplete gear 3 is 120°. When the incomplete gear 3 rotates from one end to the other end, the blade 1 will also rotate 120°. That is, the maximum variable angle range of the blade 1 in this embodiment is 0-120°.

[0050] like Figure 1 As shown, the driving part 9 includes a pitch-adjusting motor 91, a pitch-adjusting screw 93 and a screw sleeve 94. The pitch-adjusting motor 91 is fixedly arranged on the top of the support seat 7. The output end of the pitch-adjusting motor 91 is connected to the reducer 92. The output end of the reducer 92 is connected to the top of the pitch-adjusting screw 93. The bottom end of the pitch-adjusting screw 93 is rotatably matched with the support seat 7. The screw sleeve 94 is fixedly arranged inside the movable block 8. The pitch-adjusting screw 93 thread passes through the screw sleeve 94.

[0051] Furthermore, rotating bearings 95 are provided at the connection points between the upper and lower ends of the pitch-adjusting screw rod 93 and the support seat 7 .

[0052] Specifically, the pitch-adjusting motor 91 drives the pitch-adjusting screw 93 to rotate through the reducer 92. Since the pitch-adjusting screw 93 is threadedly matched with the screw sleeve 94, the pitch-adjusting screw 93 drives the movable block 8 to move linearly during rotation, thereby realizing the angle change process of the blade 1.

[0053] like Figure 4 As shown, limiting grooves 71 are provided on the inner walls of both sides of the support seat 7 , and limiting sliders 83 are provided at both ends of the movable block 8 , and the limiting sliders 83 are adapted to be slidably installed in the limiting grooves 71 .

[0054] Specifically, during the linear motion of the movable block 8, the limiting slider 83 always keeps sliding in the limiting groove 71, so that the movable block 8 can remain stable during the motion.

[0055] like Figure 5 and Figure 6 As shown, the interior of the correction sleeve 11 is divided into two upper and lower chambers, and linear motion ball bearings 111 are arranged on the inner walls of the chambers, an upper pressure block 112 is slidably arranged inside the upper chamber, and a lower pressure block 113 is slidably arranged inside the lower chamber, an upper correction hole 114 is arranged at the bottom of the upper chamber, a first electrode ring 1141 is arranged on the inner wall of the upper correction hole 114, a lower correction hole 115 is arranged at the top of the lower chamber, and a second electrode ring 1151 is arranged on the inner wall of the lower correction hole 115.

[0056] like Figure 7 As shown, a conical surface sealing portion 1121 is provided on the top of the upper pressing block 112, a correction contact rod 1123 corresponding to the upper correction hole 114 is fixedly provided on the bottom of the upper pressing block 112, an extrusion spring 1122 is provided between the bottom of the upper pressing block 112 and the correction sleeve 11, an upper pressing rod 121 is extended from the bottom of the upper screw 12, the upper pressing rod 121 passes through the top of the correction sleeve 11 and abuts against the conical surface sealing portion 1121.

[0057] Furthermore, the lower pressing block 113 and the upper pressing block 112 have the same structure and are symmetrically arranged in the vertical direction, and the lower screw rod 13 and the upper screw rod 12 have the same structure and are symmetrically arranged in the vertical direction.

[0058] Specifically, by setting the correction component, in the initial state, the upper pressing block 112 and the lower pressing block 113, under the elastic force of the corresponding extrusion spring 1122, push the conical sealing portion 1121 tightly against the upper and lower ends of the correction sleeve 11, thereby sealing the cylinder cavity to prevent external impurities from mixing into the cylinder. Before measuring, the upper screw rod 12 and the lower screw rod 13 are rotated and adjusted to the specified position in advance, and the movable block 8 moves upward at the same time, so that the incomplete gear 3 rotates to the extreme position of one end with the propeller root 2. During this process, the upper pressing rod 121 will gradually pass through the correction sleeve 11 and abut against the conical sealing portion 1121, and push the upper pressing block 112 gradually close to the upper correction hole 114 until the correction. The contact rod 1123 is aligned and inserted into the upper correction hole 114, and the correction contact rod 1123 contacts the first electrode ring 1141 and is energized. Receiving the electrical signal indicates that the movable block 8 has reached the initial measuring position at the top. Similarly, during the measurement process, the lower pressure rod on the lower screw 13 will also push the lower pressure block 113. When the second electrode ring 1151 is energized, it indicates that the movable block 8 has reached the final measuring position at the bottom, so that the one-way stroke of the movable block 8 matches the maximum rotation angle of the incomplete gear 3, and the distance adjustment range of the movable block 8 can be accurately calibrated, and the distance adjustment range can be finely controlled by rotating and adjusting the upper screw 12 and the lower screw 13, so as to improve the measurement accuracy.

[0059] The working principle of the measuring device in the present invention is as follows: Figure 1-Figure 7As shown, when in use, in the initial state, the upper pressing block 112 and the lower pressing block 113, under the elastic force of the corresponding extrusion spring 1122, push the conical sealing part 1121 tightly against the upper and lower ends of the correction sleeve 11, thereby sealing the barrel cavity to prevent external impurities from mixing into the barrel. Before measuring, the upper screw rod 12 and the lower screw rod 13 are rotated and adjusted to the specified position in advance, and the movable block 8 moves upward at the same time, so that the incomplete gear 3 rotates to the limit position of one end with the blade root 2. During this process, the upper pressing rod 121 will gradually pass through the correction sleeve 11 and abut against the conical sealing part 1121, and push the upper pressing block 112 gradually close to the upper correction hole 114, until the correction contact rod 1123 is aligned and inserted into the upper correction hole 114, and the correction contact rod 1123 contacts the first electrode ring 1141 and is energized. Receiving the electrical signal indicates that the movable block 8 has reached the initial measurement position at the top. During the measurement process, the driving unit 9 drives the movable block 8 to move up and down in a straight line. By means of the sliding cooperation between the sliding sleeve 82 and the sliding pin 21, the movable block 8 will drive the blade root 2 to rotate, thereby realizing the angle change process of the blade 1. At the same time, the incomplete gear 3 will rotate with the angle change of the blade 1, and the incomplete gear 3 will drive the transmission gear 4 to rotate. The angle sensor 6 is used to collect and measure the rotation tooth number signal of the transmission gear 4, and the data signal is transmitted to the background processor through the electric slip ring 10. The background processor processes the received signal into the rotation angle of the blade 1, thereby realizing the real-time monitoring process of the angle change process of the blade 1. When the second electrode ring 1151 is energized, it means that the movable block 8 has reached the final measurement position at the bottom, so that the one-way stroke of the movable block 8 matches the maximum rotation angle of the incomplete gear 3, and then the pitch adjustment range of the movable block 8 can be accurately calibrated.

[0060] The present invention also provides a method for real-time measurement of the angle of an electric variable pitch propeller blade, using the above-mentioned device for real-time measurement of the angle of an electric variable pitch propeller blade, comprising the following steps:

[0061] Step 1: Range calibration: Before measuring, rotate and adjust the upper screw 12 and the lower screw 13 to the specified positions respectively, and calibrate the pitch adjustment range of the movable block 8 with the correction sleeve 11, so that the pitch adjustment range is consistent with the maximum range of the blade 1;

[0062] Step 2: The blade angle is changed. The driving unit 9 drives the movable block 8 to move up and down in a straight line. The sliding sleeve 82 and the sliding pin 21 are used to slide together to drive the blade root 2 to rotate so as to change the angle of the blade 1.

[0063] Step three, angle measurement, the rotation of the propeller root 2 will synchronously drive the incomplete gear 3 to rotate, the incomplete gear 3 drives the transmission gear 4 to rotate, and the angle sensor 6 is used to measure the angle change of the gear shaft 5 in real time.

[0064] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A real-time measuring device for the blade angle of an electric variable pitch propeller, characterized in that: include: A blade (1), the blade (1) being assembled and connected to a blade root (2), and a sliding pin (21) being eccentrically arranged on an end surface of the blade root (2); A measuring assembly, the measuring assembly comprising an incomplete gear (3), a transmission gear (4) and an angle sensor (6), the incomplete gear (3) being fixedly sleeved on the propeller root (2), the transmission gear (4) being meshed with the incomplete gear (3), a gear shaft (5) being fixedly arranged inside the transmission gear (4), and the angle sensor (6) being fixedly arranged on a mounting plate and used for measuring an angle change of the gear shaft (5); A support seat (7), wherein the support seat (7) is arranged on one side of the propeller root (2); A movable block (8), wherein one end of the movable block (8) close to the sliding pin (21) is provided with a sliding groove (81), a sliding sleeve (82) is fixedly provided on the inner wall of the sliding groove (81), and the sliding pin (21) is adapted to be slidably installed in the sliding sleeve (82); A driving part (9), the driving part (9) is used to drive the movable block (8) to perform vertical linear motion; An electric slip ring (10), the electric slip ring (10) being arranged at the bottom of the support seat (7) and used for electric signal transmission; A calibration assembly, the calibration assembly comprising a calibration sleeve (11), an upper screw rod (12) and a lower screw rod (13), the calibration sleeve (11) being fixedly arranged inside the movable block (8), the upper screw rod (12) and the lower screw rod (13) being threadably mounted on upper and lower ends of the support seat (7), respectively, the calibration assembly being used to calibrate the distance adjustment range of the movable block (8); The interior of the correction sleeve (11) is divided into two upper and lower chambers, and linear motion ball bearings (111) are arranged on the inner walls of the chambers; an upper pressing block (112) is slidably arranged inside the upper chamber, and a lower pressing block (113) is slidably arranged inside the lower chamber; an upper correction hole (114) is arranged at the bottom of the upper chamber, and a first electrode ring (1141) is arranged on the inner wall of the upper correction hole (114); a lower correction hole (115) is arranged at the top of the lower chamber, and a second electrode ring (1151) is arranged on the inner wall of the lower correction hole (115); A conical surface sealing portion (1121) is arranged at the top of the upper pressing block (112); a correction contact rod (1123) corresponding to the upper correction hole (114) is fixedly arranged at the bottom of the upper pressing block (112); a compression spring (1122) is arranged between the bottom of the upper pressing block (112) and the correction sleeve (11); an upper pressing rod (121) is extended from the bottom of the upper screw rod (12); the upper pressing rod (121) passes through the top of the correction sleeve (11) and abuts against the conical surface sealing portion (1121); The lower pressing block (113) and the upper pressing block (112) have the same structure and are symmetrically arranged in an up-and-down manner; the lower screw rod (13) and the upper screw rod (12) have the same structure and are symmetrically arranged in an up-and-down manner.

2. The device for real-time measurement of blade angle of electric variable pitch propeller according to claim 1, characterized in that: The incomplete gear (3) is a sector gear, and the sector gear has a 1 / 3 circumference.

3. The device for real-time measurement of blade angle of electric variable pitch propeller according to claim 1, characterized in that: The driving part (9) comprises a pitch-adjusting motor (91), a pitch-adjusting screw (93) and a screw sleeve (94); the pitch-adjusting motor (91) is fixedly arranged on the top of the support seat (7); the output end of the pitch-adjusting motor (91) is connected to a reducer (92); the output end of the reducer (92) is connected to the top of the pitch-adjusting screw (93); the bottom end of the pitch-adjusting screw (93) is rotatably matched with the support seat (7); the screw sleeve (94) is fixedly arranged inside the movable block (8); and the pitch-adjusting screw (93) is threadedly inserted through the screw sleeve (94).

4. The device for real-time measurement of blade angle of electric variable pitch propeller according to claim 3, characterized in that: Rotating bearings (95) are provided at the connection points between the upper and lower ends of the pitch-adjusting screw rod (93) and the support seat (7).

5. The device for real-time measurement of blade angle of electric variable pitch propeller according to claim 1, characterized in that: Limiting grooves (71) are provided on the inner walls of both sides of the support seat (7), and limiting sliding blocks (83) are provided at both ends of the movable block (8), and the limiting sliding blocks (83) are adapted to be slidably installed in the limiting grooves (71).

6. A method for real-time measurement of the blade angle of an electric variable pitch propeller, using the real-time measurement device for the blade angle of an electric variable pitch propeller as claimed in claim 1, characterized in that: The following steps are involved: Step 1: range calibration. Before measuring, the upper screw rod (12) and the lower screw rod (13) are respectively rotated and adjusted to the specified positions, and the pitch adjustment range of the movable block (8) is calibrated with the correction sleeve (11) so that the pitch adjustment range is consistent with the maximum range of the variable angle of the blade (1); Step 2: the blade angle is changed, the driving part (9) drives the movable block (8) to move up and down in a straight line, and the sliding sleeve (82) and the sliding pin (21) are used to drive the blade root (2) to rotate to achieve the angle change of the blade (1); Step three, angle measurement, the rotation of the propeller root (2) will synchronously drive the incomplete gear (3) to rotate, the incomplete gear (3) drives the transmission gear (4) to rotate, and the angle sensor (6) is used to measure the angle change of the gear shaft (5) in real time.

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