A multifunctional propeller measuring instrument and measuring method

Abstract

The present invention discloses a multifunctional propeller measuring instrument and a measuring method, wherein the measuring instrument comprises a base, an electric turntable is horizontally arranged at the tail of the base, and a transfer propeller disc is arranged on the electric turntable; an X-axis guide rail is horizontally fixedly arranged on the body of the base, an X-axis slide is arranged on the X-axis guide rail, and a blade measuring device is arranged on the X-axis slide, wherein the blade measuring device comprises a radius measuring device, an angle test bench and a chord length measuring ruler. The present invention can conveniently measure a propeller with multiple blades, and has the advantages of simple operation, accurate positioning and high testing efficiency.

Description

Technical Field

[0001] The invention specifically relates to a multifunctional propeller measuring instrument and a measuring method, and belongs to the technical field of propeller parameter measurement in aviation aircraft. Background Art

[0002] An aviation propeller is a power device that converts the output power of an engine into thrust or pull. It consists of multiple blades and a central hub. The blade is installed on the hub like a twisted slender wing. The engine shaft is connected to the hub and drives the blade to rotate in the air, thereby converting the engine's rotational power into propulsion or lift. There is a gradual twist angle from the root to the tip of the blade. The twist angle of the blade refers to the angle between the chord of the blade wing and the rotation plane. This twist angle is also called the blade angle, which is a key parameter affecting the aerodynamic layout and flight quality of the blade. Due to the existence of the twist angle, the distance the propeller moves forward in one rotation is called the pitch or pitch. The blade angle changes with the radius, and its change law is the most important factor affecting the working performance of the propeller. It is customary to take the blade angle value at 70% of the diameter as the nominal value of the blade angle of the propeller. In order to detect whether the pitch of the blade product meets the design, it is necessary to detect the twist angle at different sections of the blade. In the prior art, the measurement of the torsion angle of a single blade usually adopts the profile clamping method, which is greatly affected by human factors, takes a long time to install, has inaccurate fixture positioning, poor measurement repeatability, and low work efficiency. For the detection of propeller assemblies on aircraft, it is necessary to measure multiple data such as propeller blade diameter, pitch, and chord length. The existing detection equipment cannot meet its requirements, so it is necessary to develop a multifunctional propeller measuring instrument and a corresponding measurement method. Summary of the invention

[0003] In view of the problems existing in the prior art, the present invention provides a multifunctional propeller measuring instrument and a measuring method.

[0004] The technical solution of the present invention is: a multifunctional propeller measuring instrument, comprising a base, an electric turntable is horizontally arranged at the tail of the base, and an adapter propeller disc is arranged on the electric turntable; an X-axis guide rail is horizontally fixedly arranged on the body of the base, an X-axis slide is arranged on the X-axis guide rail, and a blade measuring device is arranged on the X-axis slide, and the blade measuring device includes a radius measuring device, an angle testing table and a chord length measuring ruler.

[0005] The radius measuring device is a grating ruler reading head, which is fixedly connected to the X-axis slide. A grating ruler is also arranged on the base body. The grating ruler is parallel to the X-axis guide rail. The grating ruler reading head is matched with the grating ruler and is slidably connected. An X-axis lock is also arranged on the X-axis slide.

[0006] Furthermore, a Z-axis lifting platform is also provided on the X-axis slide, and the angle testing platform is fixedly provided on the upper surface of the Z-axis lifting platform.

[0007] Furthermore, a Y-axis slide is provided on the angle testing platform, and the chord length measuring ruler is installed on the Y-axis slide.

[0008] Furthermore, a control display screen is also arranged on the base, and the angle test bench, the chord length measuring ruler and the grating ruler reading head are electrically connected to the control display screen.

[0009] A propeller measurement method, using the multifunctional propeller measuring instrument, the measurement steps are as follows:

[0010] S 1. First return the electric turntable to 0°, then fix the propeller on the side to be propeller on the electric turntable through the adapter propeller disc, so that one of its blades is parallel to the direction of the platform X-axis guide rail;

[0011] S 2. Move the X-axis slide to the blade tip. At this time, the X-axis slide outputs the blade radius through the grating ruler;

[0012] S 3. Move the X-axis slide to 30% of the blade radius and lock the X-axis lock;

[0013] S 4. Simultaneously adjust the measuring range of the Z-axis lifting platform, Y-axis slide, angle measuring platform, and chord length range finder so that the chord length range finder is just aligned with the leading and trailing edges of the blade section at the 30% radius. At this time, the chord length range finder outputs the chord length data to the display, and the angle measuring platform outputs the torsion angle α at this section, and the formula H=2πr*tanα is used to calculate the pitch, where H is the pitch, π is the circumference, r is the distance from the section to the blade rotation center, and α is the torsion angle;

[0014] S5. Move the X-axis slide to the positions of 40%, 50%, 60%, 70%, 80%, and 90% of the blade radius respectively. Repeat step 4 at each position. Meanwhile, the pitch and chord length data of the blade at each position are output on the display.

[0015] S 6. After completing step 5, use the electric turntable to rotate the propeller to the theoretically equal angle, repeat step 2 to test the radius of this blade, and compare it with the radius of the previous blade to calculate the radius error value;

[0016] S 7. Repeat steps 3 to 5 to measure the pitch and chord length data at 30%, 40%, 50%, 60%, 70%, 80%, and 90% of the blade radius respectively;

[0017] S 8. Repeat steps 6 and 7 to measure the radius, pitch, chord length and other data of the third blade, and determine whether the angles between adjacent blades are equal.

[0018] Beneficial effect: The adapter blade disc of the present invention is used to fix the hub of the propeller to be connected to the side, and the electric turntable drives the hub blade to rotate so that the side blade is parallel to the guide rail. The blade is supported by the chord length measuring ruler on the X-axis slide. The grating ruler can measure the blade radius and position the X-axis slide to the cross-sectional position of the side blade. At the same time, the measuring range of the Z-axis lifting platform, the Y-axis slide, the angle measuring platform, and the chord length measuring ruler is adjusted so that the chord length measuring ruler is just aligned with the leading edge and the trailing edge of the blade cross section, and the chord length data and the angle data are output to the control display screen to calculate the pitch of the blade here. The present invention can conveniently measure a propeller with multiple blades, and has the advantages of simple operation, accurate positioning, and high testing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the composition structure of the present invention.

[0020] Figure 2 It is another schematic diagram of the present invention.

[0021] Markings in the figure: 1 base, 2 guide rail, 3 X-axis slide, 4 propeller assembly, 5 electric turntable, 6 adapter propeller disc, 7 control display screen, 21 grating ruler, 31 X-axis lock, 32 Z-axis lifting platform, 33 angle test table, 34 Y-axis slide, 35 chord length measuring ruler. DETAILED DESCRIPTION

[0022] The present invention will be described in more detail below in conjunction with the accompanying drawings.

[0023] like Figure 1-2As shown, a multifunctional propeller measuring instrument comprises a base 1, an electric turntable 5 is horizontally arranged at the tail of the base, the electric turntable is driven by a motor, the rotation plane of the electric turntable is 360-degree rotation in the horizontal plane, an angle scale is arranged in the circumference of the electric turntable, an adapter blade disc 6 is horizontally fixedly connected to the upper surface of the electric turntable, the adapter blade disc 6 is used to fix the hub of the propeller assembly 4 to be on the side; two X-axis guide rails 2 are horizontally fixedly arranged parallel to each other on the body of the base, a grating ruler 21 is also arranged on the body of the base, the grating ruler is parallel to the guide rails, an X-axis slide 3 is arranged on the guide rails, the X-axis slide can be driven by a ball screw to make a linear motion along the guide rails, the reading head of the grating ruler is fixedly connected to the X-axis slide, and the position of the X-axis slide can be given in real time, and an X-axis lock 31 is also arranged on the X-axis slide 3 to lock the X-axis slide, which cannot be moved after locking. A blade measuring device is arranged on the X-axis slide 3, and the blade measuring device includes an angle test table 33 and a chord length measuring ruler 35, and the installation method is as follows: a Z-axis lifting platform 32 is arranged on the X-axis slide 3, and the angle test table 33 is fixedly arranged on the upper surface of the Z-axis lifting platform 32, a Y-axis guide rail is arranged on the angle test table 33, a Y-axis slide 34 is arranged on the Y-axis guide rail, and a chord length measuring ruler 35 is installed on the Y-axis slide 34. The chord length measuring ruler is used to clamp, support and measure the side blade, and the chord length measuring ruler 35 can make a linear motion along the Y-axis guide rail through the Y-axis slide 34.

[0024] A control display screen 7 is also provided on the base 1, and the angle test table 33, the chord length measuring ruler 35, the reading head of the grating ruler 21, the electric turntable, the ball screw, etc. are all electrically connected to the control display screen.

[0025] The following takes the measurement of the diameter, pitch and chord length of the UA-1730 three-blade propeller blade as an example to illustrate the use and testing process of the present invention.

[0026] S1. First return the electric turntable to 0°, then fix the UA-1730 propeller on the electric turntable through the adapter propeller disc, so that one of its blades is parallel to the direction of the platform's X-axis guide rail;

[0027] S 2. Move the X-axis slide to the propeller blade tip. At this time, the X-axis slide outputs the UA-1730 blade radius of 865mm through the grating ruler. The propeller diameter is obtained through software processing and displayed on the monitor as 1730mm.

[0028] S 3. Move the X-axis slide to 30% of the blade radius, that is, when the grating scale reading is 259.5mm, lock the X-axis lock;

[0029] S 4. Adjust the measuring range of the Z-axis lifting platform, Y-axis slide, angle measuring platform, and chord length measuring scale at the same time, so that the chord length measuring scale is just aligned with the leading and trailing edges of the blade section at the 30% radius. At this time, the chord length measuring scale outputs the chord length data to the display as 102.55mm, and the angle measuring platform outputs the torsion angle α angle data of 36.70° at this section. The software processes the data on the display to obtain the pitch of the blade at the 30% radius as 47.85 inches; the calculation formula for the pitch is H=2πr*tanα, where H is the pitch, in inches; π is the circumference of a circle; r is the distance from the section to the rotation center of the blade, in inches; α is the torsion angle, in degrees (°);

[0030] S5. Move the X-axis slide to the positions of 40%, 50%, 60%, 70%, 80%, and 90% of the blade radius respectively. Repeat step 4 at each position. Meanwhile, the pitch and chord length data of the blade at each position are output on the display.

[0031] S 6. After completing step 5, use the electric turntable to rotate the UA-1730 by the theoretically equal angle of 120°, repeat step 2 to test the radius of this blade, and compare it with the radius of the previous blade to calculate the radius error value;

[0032] S 7. Repeat steps 3 to 5 to measure the pitch and chord length data at 30%, 40%, 50%, 60%, 70%, 80%, and 90% of the blade radius respectively;

[0033] S 8. Repeat steps 6 and 7 to measure the radius, pitch and chord length of the third blade, and determine whether the angles between the three blades are equal. The determination method is: use the electric turntable to rotate the UA-1730 propeller 120°, and observe whether the current blade tip indication position coincides with the previous blade tip indication position, so as to determine whether the blade angle is 120°. Similarly, continue to rotate 120° to determine whether the angle between the third blade and the second blade is 120°.

[0034] Therefore, the present invention has multiple adjustable degrees of freedom such as X, Y, Z, and angle. Through the mutual cooperation of these adjustable degrees of freedom, it is convenient to measure a propeller with multiple blades, and has the advantages of simple operation, accurate positioning, and high testing efficiency.

[0035] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A multifunctional propeller measuring instrument, comprising a base, characterized in that: An electric turntable is horizontally arranged at the tail of the base, and an adapter propeller disc is arranged on the electric turntable; an X-axis guide rail is horizontally fixedly arranged on the body of the base, an X-axis slide is arranged on the X-axis guide rail, and a blade measuring device is arranged on the X-axis slide, and the blade measuring device includes a radius measuring device, an angle test bench and a chord length measuring ruler; A Z-axis lifting platform is also provided on the X-axis slide, and the angle test platform is fixedly provided on the upper surface of the Z-axis lifting platform; A Y-axis slide is provided on the angle test table, and the chord length measuring ruler is installed on the Y-axis slide; The propeller is an aviation propeller, and the propeller includes a plurality of blades; The radius measuring device is a grating ruler reading head, which is fixedly connected to the X-axis slide. A grating ruler is also arranged on the base body, the grating ruler is parallel to the X-axis guide rail, and the grating ruler reading head is matched with the grating ruler for sliding connection; an X-axis lock is also arranged on the X-axis slide. A control display screen is also provided on the base, and the radius measuring device, the angle test bench and the chord length measuring ruler are electrically connected to the control display screen; When the propeller measuring instrument is used, the propeller to be measured is first fixed on the electric turntable through the adapter propeller disc so that one of its blades is parallel to the direction of the X-axis guide rail; the X-axis slide is moved to a certain position of the blade radius, and the X-axis lock is locked; then the measuring ranges of the Z-axis lifting platform, the Y-axis slide, the angle measuring platform, and the chord length range finder are adjusted simultaneously so that the chord length range finder is just aligned with the leading edge and the trailing edge of the blade section at the radius of the position, at which time the chord length range finder outputs the chord length data to the display screen, and the angle measuring platform outputs the torsion angle α at this section, and the pitch is calculated using the formula H=2πr*tanα, where H is the pitch, π is the pi, r is the distance from the section to the rotation center of the blade, and α is the torsion angle; The measuring steps of the multifunctional propeller measuring instrument are as follows: S 1. First, return the electric turntable to 0°, and then fix the propeller to be tested on the electric turntable through the adapter propeller disc, so that one of its blades is parallel to the direction of the platform X-axis guide rail; S 2. Move the X-axis slide to the blade tip. At this time, the X-axis slide outputs the blade radius through the grating ruler; S 3. Move the X-axis slide to 30% of the blade radius and lock the X-axis lock; S 4. Simultaneously adjust the measuring range of the Z-axis lifting platform, Y-axis slide, angle measuring platform, and chord length measuring ruler to make the chord length measuring The ruler is aligned with the leading and trailing edges of the blade section at 30% radius, and the chord length and twist angle are measured here, and the pitch is calculated; S5. Move the X-axis slide to the positions of 40%, 50%, 60%, 70%, 80%, and 90% of the blade radius respectively. Repeat step 4 at each position. Meanwhile, the pitch and chord length data of the blade at each position are output on the display. S 6. After completing step 5, use the electric turntable to rotate the propeller to the theoretically equal angle, repeat step 2 to test the radius of this blade, and compare it with the radius of the previous blade to calculate the radius error value; S 7. Repeat steps 3 to 5 to measure the pitch and chord length data at 30%, 40%, 50%, 60%, 70%, 80%, and 90% of the radius of the blade respectively; S 8. Repeat steps 6 to 7 to measure the radius, pitch and chord length of the next blade, and determine whether the angles between adjacent blades are equal.

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