Propeller blade gravity center measuring device

Abstract

The invention provides a propeller blade gravity center measuring device, and relates to the technical field of aviation propeller blade detection. The device comprises a basic shaft, a limiting supporting knife edge is installed on the basic shaft, the bottom of the limiting supporting knife edge is arranged at the top of a basic shaft seat, so that the two ends of the basic shaft only can tilt up and down relative to the limiting supporting knife edge, external threads are arranged on the surfaces of the basic shaft on the two sides of the limiting supporting knife edge, and a paddle installation base used for fixing a paddle sample piece is arranged at one end of the basic shaft; a zero-setting counterweight disc in threaded connection with the external thread is mounted on the external thread between the paddle mounting base and the limiting supporting knife edge, a counterweight disc in threaded connection with the external thread is mounted on the external thread on one side, far away from the paddle mounting base, of the limiting supporting knife edge, and a detection assembly for detecting the levelness of the basic shaft is arranged at the other end of the basic shaft. According to the device, the axial gravity center position of the propeller blade can be simply, conveniently and reliably measured and calculated, and the measurement precision is high.

Description

Technical Field

[0001] The invention relates to the technical field of aviation propeller blade detection, in particular to a propeller blade center of gravity measuring device. Background Art

[0002] In the actual production process of propellers, due to the certain deviation between the theoretical and actual production blade center of gravity, the center of mass of the produced propeller will not be on its rotation axis, thus causing static imbalance of the propeller and causing large vibration. Or during long-term operation, it collides with air or other foreign objects, causing the blades to bend, curl, and deform, causing the propeller to lose balance. Therefore, the center of gravity of the propeller must be measured and balanced to achieve the allowable center of gravity position deviation, or to reduce the amplitude of the mechanical vibration generated by it to within the allowable range. Therefore, it is necessary to measure and balance the axial center of gravity of the propeller blades.

[0003] In view of the above reasons, the present invention proposes a propeller blade center of gravity measurement device to solve the above technical problems. Summary of the invention

[0004] The object of the present invention is to provide a device for measuring the center of gravity of a propeller blade, which can simply and reliably measure the axial center of gravity position of the propeller blade with high measurement accuracy.

[0005] The present invention provides a device for measuring the center of gravity of a propeller blade, comprising: a base shaft, a limit support blade being installed on the base shaft, the bottom of the limit support blade being placed on the top of a base shaft seat, so that the two ends of the base shaft can only tilt up and down relative to the limit support blade, the surfaces of the base shaft on both sides of the limit support blade are both provided with external threads, one end of the base shaft is provided with a blade mounting base for fixing a blade sample, a zeroing counterweight disk threadedly connected to the blade mounting base is installed on the external thread between the blade mounting base and the limit support blade, a counterweight disk threadedly connected to the blade mounting base is installed on the external thread of the limit support blade away from the blade mounting base, and the other end of the base shaft is provided with a detection component for detecting its horizontality.

[0006] Preferably, the blade mounting base is semi-cylindrical, the root of the blade-like component is installed between the blade mounting base and the blade fixing seat, the blade fixing seat is semi-cylindrical and adapted to the blade mounting base, and the two are detachably connected by locking screws.

[0007] Preferably, the base shaft is provided with a cylindrical section, the limit support blade is fixed on one side of the cylindrical section, and the diameter of the external thread between the limit support blade and the blade mounting base is larger than the diameter of the external thread between the limit support blade and the detection component, and the zero adjustment counterweight plate is used for zeroing before balancing measurement, and the outer periphery of the zero adjustment counterweight plate is installed with a locking screw for locking the position of the zero adjustment counterweight plate after zeroing.

[0008] Preferably, the bottom of the base shaft seat is placed on the bottom plate of the device, and a plurality of sets of leveling bolts are provided on the bottom of the base shaft seat.

[0009] Preferably, a detection plane is provided at the other end of the base shaft, and the detection plane is parallel to the cutting edge line at the bottom of the limiting support blade.

[0010] Preferably, the detection assembly includes a detection base, a fixed base is provided at the bottom of the detection base, two weight sensors are installed on the detection base and are arranged opposite to each other up and down, and the contacts of the two weight sensors are respectively attached to the top and bottom of the detection plane.

[0011] Preferably, the detection base is C-shaped, and the weight sensor is detachably connected to the top and bottom of the opening side of the detection base through sensor fixing screws respectively.

[0012] Preferably, a measuring component is further provided below the base shaft, and the measuring component is used to measure the distance between the counterweight disc and the limiting support blade.

[0013] Preferably, a scale is provided on the surface of the measuring component, a disc position pointer capable of sliding horizontally along the top of the measuring component is installed, and the outer edge cross-section of the counterweight disc is V-shaped.

[0014] Preferably, a V-shaped groove is provided on the top of the base shaft seat, the bottom of the limit support blade is adapted to be limited in the V-shaped groove, and the bottom angle of the V-shaped groove is greater than the angle of the bottom cutting edge of the limit support blade, and limit bars for limiting the forward and backward movement of the limit support blade are respectively fixed on both sides of the base shaft seat.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention can make the two ends of the base shaft pry up and down relative to it by installing a limit support blade on the base shaft, and install a zero-adjusting counterweight disk on one side of the limit support blade, so that zeroing can be performed before installing the blade sample. Then, the blade sample is installed at one end of the base shaft, and a movable counterweight disk is installed at the other end of the base shaft for balancing. At the same time, a detection component is set at the other end of the base shaft to detect the horizontality of the base shaft. By adjusting the position of the counterweight disk, balancing can be achieved when the reading of the detection component is 0. At this time, the distance from the counterweight disk to the limit support blade is measured. According to the mass of the blade sample and the counterweight disk, the distance from the center of gravity of the blade sample to the limit support blade can be obtained through simple calculation. By setting zero before measurement, high measurement accuracy can be guaranteed;

[0017] 2. The limit support blade structure of the present invention is simple and reliable, which reduces the use of traditional bearings and other parts, and has high measurement accuracy;

[0018] 3. The components of the device of the present invention are modularly designed with a high degree of standardization, and can use mature shelf parts. The installation and operation are simple and reliable, and the propeller blades of different specifications can be adapted by replacing the blade mounting base. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the overall structure of the propeller blade center of gravity measuring device of the present invention;

[0021] Figure 2 It is a schematic diagram of the structure of the base shaft in the measuring device of the present invention;

[0022] Figure 3 It is a schematic diagram of the structure of the detection component in the measuring device of the present invention;

[0023] Figure 4 It is a schematic diagram of the structure of the measuring component in the measuring device of the present invention;

[0024] Description of reference numerals:

[0025] 10: Blade sample; 11: Device bottom plate; 12: Base shaft seat; 20: Blade fixing seat; 30: Zero adjustment counterweight disc; 40: Base shaft; 401: Blade mounting base; 402: Large diameter threaded section; 403: Limit support edge; 404: Cylindrical section; 405: Small diameter threaded section; 406: Detection plane; 50: Counterweight disc; 60: Detection assembly; 601: Detection base; 602: Sensor fixing screw; 603: Weight sensor; 604: Fixed base; 70: Measuring assembly; 80: Disc position pointer; 90: Leveling bolt. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than 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.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0028] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] like Figure 1-4As shown, the present invention provides a device for measuring the center of gravity of a propeller blade, comprising: a base shaft 40, a limited support blade 403 is installed on the base shaft 40, the bottom of the limited support blade 403 is placed on the top of the base shaft seat 12, the base shaft seat 12 can limit the limited support blade 403, so that the two ends of the base shaft 40 can only tilt up and down relative to the limited support blade 403, the surfaces of the base shaft 40 on both sides of the limited support blade 403 are provided with external threads, the left end of the base shaft 40 is provided with a blade mounting base 401 for fixing the blade sample 10, the blade sample 10 belongs to the blade to be measured, and is used for installation display and auxiliary explanation of the device, the blade mounting base 401 can cooperate with the blade fixing seat 20 to fix and press the root of the blade sample 10, and realize the connection between the blade sample 10 and the base shaft 40, the blade mounting A zeroing counterweight disk 30 threadedly connected to the mounting base 401 is installed on the external thread between the mounting base 401 and the limiting support edge 403. By rotating the zeroing counterweight disk 30, its position on the base shaft 40 can be adjusted to move left and right, and it can be zeroed when the blade sample 10 and the counterweight disk 50 are not installed. Even if the center of gravity of the base shaft 40 is located at the limiting support edge 403, the counterweight disk 50 is installed on the external thread of the limiting support edge 403 away from the blade mounting base 401 and is threadedly connected to it. By rotating the counterweight disk 50, its position on the base shaft 40 can be adjusted to achieve leveling with the blade sample 10 about the limiting support edge 403. A detection component 60 for detecting its horizontality is provided at the right end of the base shaft 40. The detection of the detection component 60 can ensure that the base shaft 40 is adjusted to a horizontal state.

[0030] Specifically, the base shaft 40 is processed as one piece, and a cylindrical section 404 is arranged on the base shaft 40. The limit support blade 403 is sleeved on the left side of the cylindrical section 404 and fixed at the top thereof by a locking screw. The diameter of the external thread between the limit support blade 403 and the blade mounting base 401 is larger than the diameter of the external thread between the limit support blade 403 and the detection component 60, that is, the left side of the limit support blade 403 is a large-diameter threaded section 402, and the zeroing counterweight 30 is installed on the large-diameter threaded section 402. 02 surface, which is used for zeroing before balancing measurement. The periphery of the zeroing counterweight disk 30 is installed with a locking screw made of plastic, which is used to lock the position of the zeroing counterweight disk 30 after zeroing. The right side of the cylindrical section 404 is the small diameter threaded section 402, and the counterweight disk 50 is installed on the surface of the small diameter threaded section 402. Since the mass of the counterweight disk 50 is generally less than the mass of the blade sample 10, the length of the small diameter threaded section 402 is designed to be greater than the length of the large diameter threaded section 402.

[0031] The blade mounting base 401 is semi-cylindrical and is integrally connected to the disk arranged at the left end of the base 40. The root of the blade sample 10 is installed between the blade mounting base 401 and the blade fixing seat 20. The blade fixing seat 20 is semi-cylindrical and adapted to the blade mounting base 401. The two are detachably connected by multiple sets of locking screws, thereby fixing the root of the blade sample 10. By replacing blade mounting bases 401 and blade fixing seats 20 of different specifications, the root of propeller blades of different specifications can be fixed.

[0032] A detection plane 406 is provided at the right end of the base shaft 40 . The detection plane 406 is parallel to the edge line of the bottom of the limiting support blade 403 , and its width is smaller than the diameter of the small-diameter threaded section 402 to avoid affecting the installation of the counterweight disc 50 .

[0033] In this embodiment, the bottom of the base shaft seat 12 is placed on the device bottom plate 11, and a plurality of leveling bolts 90 are arranged at the bottom of the base shaft seat 12 for adjusting the horizontality of the base shaft seat 12. A V-shaped groove is arranged at the top of the base shaft seat 12, and the width of the V-shaped groove is equal to the width of the edge of the limit support blade 403. The bottom edge of the limit support blade 403 is 60° and is adapted to be limited in the V-shaped groove, and the bottom angle of the V-shaped groove is greater than the angle of the bottom edge of the limit support blade 403, so that it can be tilted left and right relative to the V-shaped groove, thereby enabling the left and right ends of the base shaft 40 to tilt up and down. The front and rear sides of the base shaft seat 12 are respectively fixed with limit bars for limiting the freedom of the limit support blade 403 along the front and rear directions of the V-shaped groove to prevent the base shaft 40 from moving forward and backward during use.

[0034] In this embodiment, the detection component 60 includes a detection base 601, and a fixed base 604 for fixing the detection base 601 is provided at the bottom thereof. Two weight sensors 603 arranged opposite to each other up and down are installed on the detection base 601. The contacts of the two weight sensors 603 are lightly attached to the top and bottom of the detection plane 406 respectively. If the base shaft 40 is not in a horizontal state, a force will be generated on the contacts of the weight sensor 603, and the weight sensor 603 can detect the force conditions above and below.

[0035] The detection base 601 is C-shaped, and the two weight sensors 603 are detachably connected to the top and bottom of the opening side of the detection base 601 through sensor fixing screws 602. The height of the two weight sensors 603 can be adjusted by the sensor fixing screws 602, so that when the base shaft 40 is in a horizontal state, the contacts of the two weight sensors 603 are lightly fitted with the detection plane 406.

[0036] In this embodiment, a measuring assembly 70 is further provided below the base shaft 40. The measuring assembly 70 is located in the same horizontal plane as the device bottom plate 11. A scale is provided on the surface of the measuring assembly 70 for measuring the distance between the counterweight disc 50 and the limit support blade 403. A disc position pointer 80 capable of sliding horizontally along the measuring assembly 70 is installed on the top of the measuring assembly 70. A slide rail is provided on the top of the measuring assembly 70. The disc position pointer 80 is fixed on a slide block adapted to slide with the slide rail. The outer edge section of the counterweight disc 50 is V-shaped. When the counterweight disc 50 is moved to the leveling position, the disc position pointer 80 is moved to align with the outer contour line of the counterweight disc 50, that is, to align with the center of gravity of the counterweight disc 50 in the axial direction of the base shaft 40. At this time, the reading of the scale of the measuring assembly 70 is the distance between the center of gravity of the counterweight disc 50 and the limit support blade 403.

[0037] The specific working principle of the blade gravity center measuring device is as follows: fix the blade root of the propeller in the blade fixing seat 20 of the device, and adjust the position of the counterweight disk 50 so that the readings of the two weight sensors 603 are respectively 0. At this time, it can be determined that the base shaft 40 is in a horizontal state. At this time, read the position of the counterweight disk 50, and the position of the blade gravity center along the axis can be obtained by simple conversion. The specific implementation method is:

[0038] (1) Leveling before blade center of gravity test: When the device is not equipped with the tested blade and the counterweight disk 50, the device is leveled using the leveling screw 90. The zero-adjusting counterweight disk 30 is rotated so that the readings of the two weight sensors 603 of the detection assembly 60 are 0, indicating that the leveling is completed. The locking screw is then tightened so that the zero-adjusting counterweight disk 30 does not rotate any more.

[0039] (2) Blade center of gravity measurement: Weigh the propeller blade to be measured and record the propeller blade weight value aKg. Install the blade root in the blade fixing seat 20. The weight of the counterweight disk 50 is bKg. Install it on the small diameter threaded section 405 of the base shaft 40. At this time, the reading of the weight sensor 603 is not 0. Adjust the position of the counterweight disk 50 to make the reading "return to 0". Move the disk position pointer 80 to align with the outer contour line of the counterweight disk 50 and read the scale value xmm of the measuring component 70 corresponding to the counterweight disk 50 at this time.

[0040] (3) The center of gravity position of the measured blade is obtained by simple calculation: Finally, the above measured data is converted, that is, y (the horizontal distance of the center of gravity position of the blade relative to the limit support edge 403 in mm) = b*x / a is obtained, and the axial center of gravity position of the blade can be obtained.

[0041] Finally, it should be noted that 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A propeller blade center of gravity measuring device, characterized in that: include: A base shaft, a limited support blade is installed on the base shaft, the bottom of the limited support blade is placed on the top of the base shaft seat, so that the two ends of the base shaft can only tilt up and down relative to the limited support blade, the base shaft surface on both sides of the limited support blade is provided with external threads, one end of the base shaft is provided with a blade mounting base for fixing the blade sample, a zeroing counterweight plate threadedly connected to the blade mounting base is installed on the external thread between the blade mounting base and the limited support blade, a counterweight disc threadedly connected to the blade mounting base is installed on the external thread of the limited support blade away from the blade mounting base, and the other end of the base shaft is provided with a detection component for detecting its horizontality.

2. The device for measuring the center of gravity of a propeller blade according to claim 1, characterized in that: The blade mounting base is semi-cylindrical, the blade root of the blade sample is installed between the blade mounting base and the blade fixing seat, the blade fixing seat is semi-cylindrical and adapted to the blade mounting base, and the two are detachably connected by means of locking screws.

3. The propeller blade center of gravity measuring device according to claim 1, characterized in that: The base shaft is provided with a cylindrical section, the limit support blade is fixed on one side of the cylindrical section, and the diameter of the external thread between the limit support blade and the blade mounting base is larger than the diameter of the external thread between the limit support blade and the detection component, the zero adjustment counterweight plate is used for zeroing before balancing measurement, and the outer periphery of the zero adjustment counterweight plate is installed with a locking screw for locking the position of the zero adjustment counterweight plate after zeroing.

4. The device for measuring the center of gravity of a propeller blade according to claim 1, characterized in that: The bottom of the base shaft seat is placed on the device bottom plate, and a plurality of groups of leveling bolts are arranged on the bottom of the base shaft seat.

5. The device for measuring the center of gravity of a propeller blade according to claim 1, characterized in that: A detection plane is arranged at the other end of the base shaft, and the detection plane is parallel to the cutting edge line at the bottom of the limiting support blade.

6. The device for measuring the center of gravity of a propeller blade according to claim 5, characterized in that: The detection assembly includes a detection base, a fixed base is arranged at the bottom of the detection base, and two weight sensors arranged opposite to each other are installed on the detection base, and the contacts of the two weight sensors are respectively attached to the top and bottom of the detection plane.

7. The device for measuring the center of gravity of a propeller blade according to claim 5, characterized in that: The detection base is C-shaped, and the weight sensor is detachably connected to the top and bottom of the opening side of the detection base through sensor fixing screws.

8. The device for measuring the center of gravity of a propeller blade according to claim 1, characterized in that: A measuring component is also arranged below the base shaft, and the measuring component is used to measure the distance between the counterweight disc and the limiting support blade.

9. The device for measuring the center of gravity of a propeller blade according to claim 8, characterized in that: The surface of the measuring component is provided with a scale, the top of the measuring component is provided with a disc position pointer which can slide horizontally along the disc, and the outer edge section of the counterweight disc is V-shaped.

10. The device for measuring the center of gravity of a propeller blade according to claim 1, characterized in that: A V-shaped groove is provided on the top of the base shaft seat, the bottom of the limit support blade is adapted to be limited in the V-shaped groove, and the bottom angle of the V-shaped groove is greater than the angle of the bottom edge of the limit support blade, and limit bars for limiting the forward and backward movement of the limit support blade are fixed on both sides of the base shaft seat.

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