Blade gravity center position measuring device

Abstract

The invention provides a blade gravity center position measuring device which comprises a supporting frame, a supporting shaft is rotatably mounted on the supporting frame, a connecting shaft perpendicular to the supporting shaft is mounted on the supporting shaft, a blade fixing seat is fixedly mounted at one end of the connecting shaft, a blade body is detachably mounted on the blade fixing seat, and a blade fixing seat is fixedly mounted at the other end of the connecting shaft. And the other end of the connecting shaft is provided with a position-adjustable measuring weight in a penetrating manner. A connecting shaft is installed on a rotatable supporting shaft, one end of the connecting shaft is provided with a blade to be measured through a blade fixing seat, the other end of the connecting shaft is provided with a position-adjustable measuring weight in a penetrating manner, and the spanwise gravity center position of the blade is measured and calculated by adjusting the position of the measuring weight, so that the gravity center positions of a plurality of blades assembled on a propeller are consistent; and stable and safe operation of the propeller or rotor wing system can be ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of propeller center of gravity position measurement, and particularly to a propeller center of gravity position measurement device. BACKGROUND

[0002] The main purpose of propeller center of gravity position measurement is to ensure that the center of gravity positions of multiple propeller blades of a propeller are consistent. If the center of gravity of a propeller blade is not on the theoretical rotation axis when the propeller rotates, an unbalanced centrifugal force is generated, which increases sharply with the increase of rotation speed. In addition, even if the weights of each propeller blade are completely consistent, the center of gravity positions are inconsistent, and the entire rotating system is still dynamically unbalanced, which causes the propeller to vibrate violently. Therefore, the present application provides a simple measurement device for measuring the spanwise center of gravity position of a propeller blade, ensuring the consistency of the center of gravity positions of multiple propeller blades of a propeller, and ensuring that the propeller is in a good dynamic balance state when rotating at a high speed. SUMMARY

[0003] The present application aims to provide a propeller center of gravity position measurement device which can detect the center of gravity position of a propeller blade and ensure the safety performance of a propeller structure.

[0004] To achieve the above purpose, the present application provides a propeller center of gravity position measurement device, which comprises a support frame, a support shaft rotatably installed on the support frame, a connecting shaft vertically arranged on the support shaft, a propeller blade fixing seat fixedly installed on one end of the connecting shaft, and a propeller blade body detachably installed on the propeller blade fixing seat. The other end of the connecting shaft is provided with a position-adjustable measuring weight.

[0005] Further, one end of the connecting shaft away from the propeller blade fixing seat is provided with a threaded connection part, and the inner wall of the measuring weight is provided with an internal thread matched with the threaded connection part.

[0006] Further, the propeller blade fixing seat is provided with a mounting opening, the propeller blade body is coaxially inserted into the mounting opening, a threaded fastening ring is coaxially sleeved on the propeller blade body, and the threaded fastening ring is threadedly connected with the mounting opening.

[0007] Further, one end of the connecting shaft connected with the propeller blade fixing seat is provided with a positioning plate, a plurality of first connecting holes are equidistantly arranged on the positioning plate along the circumferential direction thereof, and a plurality of second connecting holes corresponding to the first connecting holes are equidistantly arranged on the end face of the propeller blade fixing seat along the circumferential direction thereof.

[0008] Further, an axle hole is formed on the connecting shaft along the radial direction thereof, the connecting shaft is inserted into the support shaft through the axle hole, a first pin hole for inserting a pin is formed on the connecting shaft along a direction perpendicular to the axle hole, and a second pin hole corresponding to the first pin hole is formed on the support shaft.

[0009] Further, the axis of the first pin hole intersects with the axis of the shaft hole.

[0010] Further, a tool hole is symmetrically arranged on one side of the measuring weight.

[0011] Further, bearings are symmetrically arranged on both sides of the support frame, and both ends of the support shaft are fixedly arranged on inner rings of the bearings.

[0012] Further, a cylindrical groove is arranged on one end of the paddle fixing base close to the connecting shaft, and a positioning block matched with the cylindrical groove is detachably arranged on the root of the paddle body.

[0013] Further, the length and width of the positioning block are same as the length and width of the cylindrical groove.

[0014] The technical scheme of the present application comprises the following steps: a connecting shaft is arranged on a rotatable support shaft, one end of the connecting shaft is arranged with a paddle to be measured through a paddle fixing base, the other end of the connecting shaft is arranged with a measuring weight with adjustable position, the position of the measuring weight is adjusted to measure and calculate the position of the spreadwise gravity center of the paddle, so that the positions of the gravity centers of the multiple paddles of the assembled propeller are consistent, and the propeller or the rotor system can run stably and safely. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the specific embodiments of the present application or the technical scheme in the prior art, the drawings needed in the following specific embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0016] Figure 1 is a structural schematic view of the paddle gravity center position measuring device of the present application; Figure 2 is a structural schematic view of the paddle fixing base of the present application; Figure 3 is a structural schematic view of the connecting shaft of the present application; Figure 4 is a structural schematic view of the measuring weight of the present application; Figure 5 is an exploded view of the corresponding connecting and mounting structure of the paddle fixing base and the paddle body in the present application; Figure 6 is an exploded view of the paddle fixing base and the paddle body in the present application.

[0017] Explanation of reference signs: 1-blade fixing seat, 11-mounting port, 12-cylindrical groove, 13-second connecting hole, 2-blade body, 21-positioning block, 22-threaded fastening ring, 23-positioning hole, 24-counterbore hole, 3-connecting shaft, 31-positioning plate, 32-pin hole, 33-shaft hole, 34-threaded connecting part, 4-bearing, 5-measuring weight, 51-internal thread, 52-fixture hole site, 6-supporting shaft, 7-supporting frame. DETAILED DESCRIPTION

[0018] The technical solutions of the present application will be described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0019] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0020] In addition, the terms "first", "second" are only 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 with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, "a plurality of" means two or more, unless otherwise explicitly and specifically limited. In addition, the terms "mounting", "connecting", "connecting" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0021] Example 1 As Figures 1-6As shown, the present application provides a paddle center of gravity position measuring device, including support frame 7, support shaft 6, paddle fixing seat 1 and measuring weight 5, both sides of support frame 7 are symmetrically installed with bearing 4, both ends of support shaft 6 are fixedly installed on the inner ring of bearing 4. Support shaft 6 is installed with connecting shaft 3 which is vertically arranged, one end of connecting shaft 3 is installed with paddle fixing seat 1 through bolt, paddle fixing seat 1 is provided with installation port 11, paddle body 2 is coaxially inserted into installation port 11, so that paddle body 2 is detachably installed on paddle fixing seat 1.

[0022] The end of paddle fixing seat 1 away from threaded port is provided with cylindrical groove 12, the length of cylindrical groove 12 is greater than the diameter of positioning plate 31, the setting of cylindrical groove 12 determines that each measuring paddle is at the same installation angle, the position and shape of the groove can be adjusted according to the installation mode of paddle. The root of paddle body 2 is provided with even number of positioning holes 23 along the circumference at equal intervals, among which two mutually symmetrical positioning holes 23 on the same diameter line are installed with cuboid-shaped positioning block 21 through countersunk screw, the length and width of positioning block 21 are the same as the length and width of cylindrical groove 12, countersunk hole 24 is provided on positioning block 21, positioning block 21 can be clamped in cylindrical groove 12, which is used for limiting the axial rotation of paddle, threaded fastening ring 22 is coaxially sleeved on the root of paddle, which is not connected and fixed between the paddle, that is, the fastening ring can freely rotate relative to the paddle, the paddle is pressed and fixed on paddle fixing seat 1 through the threaded cooperation of threaded fastening ring 22 and installation port 11 on paddle fixing seat 1 (only the end port of installation port 11 is provided with thread).

[0023] The outer side of one end of connecting shaft 3 away from paddle fixing seat 1 is provided with threaded connection part 34, the inner wall of measuring weight 5 is provided with inner thread 51 matched with threaded connection part 34, so that measuring weight 5 is adjustably installed on connecting shaft 3, one side of measuring weight 5 is symmetrically provided with tool hole 52, the axial position of weight is changed through tool wrench, the weight can be replaced, and the weight is designed and matched according to the weight of paddle. When used, the position of measuring weight 5 on connecting shaft 3 is changed, the distance between weight and the center line of support shaft is measured, and then the center of gravity position of paddle body 2 to be measured is calculated according to the formula of lever theorem. ; In the formula, is the distance between the center of measuring weight 5 and the center line of support shaft, is the weight of measuring weight 5, is the weight of paddle, is the distance between the center of gravity of paddle and the center line of support shaft, that is, the position of the center of gravity of paddle.

[0024] The end of the connecting shaft 3 connected with the paddle fixed seat 1 is provided with a positioning plate 31, a plurality of first connecting holes are equidistantly arranged on the positioning plate 31 along the circumferential direction, a plurality of second connecting holes 13 corresponding to the first connecting holes are equidistantly arranged on the end face of the paddle fixed seat 1 along the circumferential direction, and bolts are used to connect the first connecting holes with the second connecting holes 13 during installation, so as to realize the fixed connection of the connecting shaft 3 and the paddle fixed seat 1.

[0025] The connecting shaft 3 is provided with a shaft hole 33 along the radial direction, the connecting shaft 3 is arranged on the supporting shaft 6 through the shaft hole 33, the connecting shaft 3 is provided with a first pin hole 32 for inserting a pin along the direction perpendicular to the shaft hole 33, the supporting shaft 6 is provided with a second pin hole corresponding to the first pin hole 32, the axis of the first pin hole 32 intersects with the axis of the shaft hole 33, and the pin is arranged in the first pin hole 32 and the second pin hole during installation, so as to realize the fixation between the connecting shaft 3 and the supporting shaft 6.

[0026] During use, the paddle spanwise gravity center position is calculated by adjusting the position of the measuring weight 5, the gravity center positions of the plurality of paddles of the assembled propeller are ensured to be consistent, and the propeller or rotor system can be stably and safely operated.

[0027] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A device for measuring the center of gravity position of a blade, characterized in that, The device includes a support frame, on which a support shaft is rotatably mounted. A connecting shaft perpendicular to the support shaft is mounted on the support shaft. A blade mounting base is fixedly mounted at one end of the connecting shaft, and the blade body is detachably mounted on the blade mounting base. An adjustable measuring weight is threaded through the other end of the connecting shaft.

2. The blade center of gravity position measuring device according to claim 1, characterized in that, The connecting shaft is provided with a threaded connection part at the end away from the blade fixing seat, and the inner wall of the measuring weight is provided with an internal thread that mates with the threaded connection part.

3. The blade center of gravity position measuring device according to claim 1, characterized in that, The blade mounting base has an installation port, the blade body is coaxially inserted into the installation port, and a threaded fastening ring is coaxially fitted on the blade body, the threaded fastening ring being threadedly connected to the installation port.

4. The blade center of gravity position measuring device according to claim 1, characterized in that, The end of the connecting shaft connected to the blade fixing seat is provided with a positioning plate. The positioning plate is provided with a plurality of first connecting holes at equal intervals along its circumference. The end face of the blade fixing seat is provided with a plurality of second connecting holes at equal intervals along its circumference, each corresponding to one of the first connecting holes.

5. The blade center of gravity position measuring device according to claim 1, characterized in that, The connecting shaft has a shaft hole along its radial direction, and the connecting shaft passes through the shaft hole onto the support shaft. The connecting shaft has a first pin hole for inserting a pin in a direction perpendicular to the shaft hole, and the support shaft has a second pin hole corresponding to the first pin hole.

6. The blade center of gravity position measuring device according to claim 5, characterized in that, The axis of the first pin hole intersects the axis of the shaft hole.

7. The blade center of gravity position measuring device according to claim 1, characterized in that, The measuring weight has symmetrical tooling holes on one side.

8. The blade center of gravity position measuring device according to claim 1, characterized in that, Bearings are symmetrically installed on both sides of the support frame, and the two ends of the support shaft are respectively fixedly installed on the inner ring of the bearing.

9. The blade center of gravity position measuring device according to claim 3, characterized in that, A cylindrical groove is provided at one end of the blade mounting base near the connecting shaft, and a positioning block that mates with the cylindrical groove is detachably installed at the root of the blade body.

10. The blade center of gravity position measuring device according to claim 9, characterized in that, The length and width of the positioning block are the same as the length and width of the cylindrical groove, respectively.

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