Centrifugal load fatigue test device of counterweight arm

Abstract

The invention relates to the technical field of centrifugal load test devices, in particular to a centrifugal load fatigue test device of a counterweight arm, which comprises a portal frame, an actuator cylinder, a traction rope, a swing seat, a sliding seat and a ground rail, and is characterized in that the actuator cylinder is suspended on the portal frame; the upper end of the traction rope is connected with the actuating cylinder, and the lower end of the traction rope is connected with the outer end of the counterweight arm; the upper end of the swing seat is rotationally connected with the inner end of the counterweight arm, so that the counterweight arm can rotate along the axis of the swing seat; the sliding seat is rotationally connected with the lower end of the swinging seat through a first rotating shaft, so that the swinging seat can swing around the first rotating shaft; the length direction of the ground rail is parallel to the first rotating shaft, and the ground rail is in sliding fit with the sliding base. A stable supporting system is formed through the portal frame and the ground rail, and flexible state adjustment of the balance weight arm is achieved in combination with a multi-dimensional rotating connection structure. By optimizing the height of the swing seat and the connection mode of the traction rope, the total centrifugal force of the counterweight arm in actual work is accurately simulated, and it is ensured that the test working condition is highly consistent with the actual working condition.

Description

Technical Field

[0001] This application relates to the field of centrifugal load testing equipment, and in particular to a centrifugal load fatigue testing equipment with a counterweight arm. Background Technology

[0002] A certain type of propeller needs to complete the certification process according to airworthiness regulations. The compliance verification of the centrifugal load test clause is a crucial step in ensuring the safety of propeller design and operation. The centrifugal load test of the propeller blade counterweight arm is a core test item that must be carried out within this closed-loop clause. During actual propeller operation, the blade counterweight arm not only revolves with the propeller as a whole but also rotates around its own axis during blade pitch adjustment. This dual motion results in the counterweight arm being subjected to complex centrifugal loads.

[0003] Existing testing equipment struggles to accurately simulate the motion and stress conditions of a counterweight arm under actual working conditions, failing to meet the testing and verification requirements under different angles and loads. This impacts the accuracy and reliability of test results, hindering compliance with airworthiness certification requirements. Therefore, there is an urgent need to design a centrifugal load fatigue testing device capable of accurately simulating the actual working conditions of a counterweight arm, enabling multi-dimensional state adjustments, and stable load loading. Summary of the Invention

[0004] This application provides a centrifugal load fatigue testing device for a counterweight arm, which solves the problem that existing testing devices are unable to accurately simulate the motion state and stress of the counterweight arm under actual working conditions, and cannot meet the test verification requirements under different angles and load conditions.

[0005] This application provides a centrifugal load fatigue testing device for a counterweight arm, comprising:

[0006] Gantry frame;

[0007] Actuator cylinder, suspended on the gantry frame;

[0008] The upper end of the traction rope is connected to the actuator cylinder, and the lower end of the traction rope is connected to the outer end of the counterweight arm.

[0009] The upper end of the swing seat is rotatably connected to the inner end of the counterweight arm, allowing the counterweight arm to rotate along the axis of the swing seat.

[0010] The slide is rotatably connected to the lower end of the swing seat via a first rotating shaft, enabling the swing seat to swing around the first rotating shaft;

[0011] The ground rail is parallel to the first rotating shaft in its length direction, and it slides in conjunction with the slide block.

[0012] In one possible design, a first hanger and a second hanger are also included. The first hanger is mounted on the gantry frame, and the second hanger is rotatably connected to the first hanger via a second rotating shaft. The second hanger is rotatably connected to the actuator via a third rotating shaft, and the second rotating shaft is perpendicular to the third rotating shaft.

[0013] In one possible design, a mounting base is also included, which is installed on the gantry frame and has multiple threaded holes. The first hanger is installed in the threaded holes by bolts.

[0014] In one possible design, the axial height of the swing seat is equal to the length of the counterweight arm.

[0015] In one possible design, the oscillating seat includes an integrally connected connecting section and a contoured section, the shape of which is consistent with the shape of the blade, and the connecting section is connected to the slide via a first pivot.

[0016] In one possible design, an angle scale is provided on the end face of the contoured section near the edge.

[0017] In one possible design, a force sensor is placed between the actuator and the traction rope.

[0018] In one possible design, an adapter is also included, which is mounted on the outer end of the counterweight arm and connected to the lower end of the traction rope.

[0019] In one possible design, the inner wall of the adapter fits against the surface of the counterweight arm and is connected by bolts.

[0020] The beneficial effects of this application are as follows:

[0021] The centrifugal load fatigue testing device for the counterweight arm disclosed in this application utilizes a stable support system formed by a gantry frame and ground rails, combined with a multi-dimensional rotational connection structure, to achieve flexible adjustment of the counterweight arm's state. Through optimized design of the swing seat height and traction rope connection method, it accurately simulates the total centrifugal force of the counterweight arm during actual operation, ensuring a high degree of consistency between the test conditions and actual conditions. The configuration of components such as angle scales and force sensors enhances the visualization and data accuracy of the test. Currently, this testing device has successfully completed centrifugal load tests on a certain type of counterweight arm, and the test results meet the compliance verification requirements of airworthiness regulations regarding centrifugal load clauses, verifying the reliability and practicality of the device. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the overall structure of the centrifugal load fatigue testing device for the counterweight arm provided in the embodiments of this application;

[0024] Figure 2 A partial structural diagram of the centrifugal load fatigue testing device for the counterweight arm provided in the embodiments of this application. Figure 1 ;

[0025] Figure 3 A partial structural diagram of the centrifugal load fatigue testing device for the counterweight arm provided in the embodiments of this application. Figure 2 .

[0026] Figure label:

[0027] 1. Gantry frame; 2. Actuator cylinder; 3. Traction rope; 4. Swing seat; 41. Connecting section; 42. Contouring section; 5. First rotating shaft; 6. Slide seat; 7. Ground rail; 8. First hanging seat; 9. Second hanging seat; 10. Second rotating shaft; 11. Third rotating shaft; 12. Fixed seat; 13. Force sensor; 14. Adapter; 15. Counterweight arm. Detailed Implementation

[0028] The technical solutions of this application will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] The following is combined Figures 1-3 This application describes the centrifugal load fatigue testing device for the counterweight arm 15 provided in the embodiments of this application.

[0030] Reference Figure 1 As shown, the centrifugal load fatigue testing device for the counterweight arm 15 provided in this application embodiment includes a gantry frame 1, an actuator cylinder 2, a traction rope 3, a swing seat 4, a slide seat 6, and a ground rail 7.

[0031] The gantry frame 1 serves as the upper support foundation of the device, providing a stable suspension carrier for the actuator cylinder 2.

[0032] Reference Figure 2As shown, in some specific embodiments, the system also includes a fixed base 12, a first hanging base 8, and a second hanging base 9. The fixed base 12 is mounted on the gantry frame 1 and has multiple threaded holes. The first hanging base 8 is detachably mounted on the fixed base 12 by bolts, facilitating adjustment of its installation position. The second hanging base 9 is rotatably connected to the first hanging base 8 via a second rotating shaft 10, and is rotatably connected to the actuating cylinder 2 via a third rotating shaft 11. The second rotating shaft 10 and the third rotating shaft 11 are perpendicular, providing freedom for adjusting the angle of the actuating cylinder 2.

[0033] The actuator 2 is suspended below the gantry 1. Its upper end is connected to the gantry 1 via the second hanger 9 and the first hanger 8, and its lower end is connected to the counterweight arm 15 via the traction rope 3, which is used to provide the traction force required for the test. The lower end of the traction rope 3 is connected to the outer end of the counterweight arm 15.

[0034] In some specific embodiments, the lower end of the traction rope 3 is connected to the outer end of the counterweight arm 15 via an adapter 14. The inner wall of the adapter 14 fits against the surface of the counterweight arm 15 to ensure the stability of the force transmission process. The adapter 14 is fixed to the outer end of the counterweight arm 15 with bolts to ensure a firm connection and prevent relative slippage during loading.

[0035] In some specific embodiments, a force sensor 13 is provided between the actuator 2 and the traction rope 3, and the force sensor 13 monitors the load size in real time.

[0036] Reference Figure 3 As shown, the swing seat 4 includes an integrally connected connecting section 41 and a contoured section 42. The shape of the contoured section 42 is consistent with the shape of the propeller blade, used to simulate the assembly state of the propeller blade and the counterweight arm 15. The connecting section 41 is rotatably connected to the slide 6 via a first rotating shaft 5, allowing the swing seat 4 to swing around the first rotating shaft 5. The upper end of the swing seat 4 is rotatably connected to the inner end of the counterweight arm 15, allowing the counterweight arm 15 to rotate along the axis (vertical direction) of the swing seat 4 to simulate the force state of the counterweight arm 15 at different positions. An angle scale is provided on the end face of the contoured section 42 near the edge, which can intuitively display the position of the counterweight arm 15 after rotation, realizing the visualization of the relative position of the counterweight arm 15 and the contoured section 42.

[0037] The axial height of the swing seat 4 is equal to the length of the counterweight arm 15. Since the upper end, lower end and center of the first rotating shaft 5 are on a straight line when the traction rope 3 is hoisted, the direction of the traction force is at a 45° angle with the counterweight arm 15, thus simulating the total centrifugal force actually experienced by the counterweight arm 15 during operation. The total centrifugal force is the resultant force of the first centrifugal force outward along the axial direction of the blade and the second centrifugal force outward along the radial direction of the blade.

[0038] The length direction of the ground rail 7 is parallel to the first rotating shaft 5. The slide 6 is slidably engaged with the ground rail 7. The slide 6 is connected to the swing seat 4 via the connecting section 41 of the first rotating shaft 5, so as to realize the movement and adjustment of the swing seat 4 along the direction of the ground rail 7.

[0039] The experimental procedure for the centrifugal load fatigue testing device of the counterweight arm 15 in this application is as follows:

[0040] Equipment assembly process:

[0041] Install the fixed seat 12 into the preset position of the gantry frame 1 with bolts. Select the threaded hole on the fixed seat 12 according to the test requirements and fix the first hanger 8 onto the fixed seat 12. Then connect the second hanger 9 to the first hanger 8 through the second rotating shaft 10, and connect the actuator 2 to the second hanger 9 through the third rotating shaft 11 to ensure that each rotating connection is flexible and without jamming.

[0042] A force sensor 13 is installed at the lower end of the actuator cylinder 2. The upper end of the traction rope 3 is connected to the force sensor 13, and the lower end of the traction rope 3 is fixed to the adapter 14, thus completing the assembly of the upper load transmission link.

[0043] The ground rail 7 is fixedly installed at the preset position of the test site to ensure that the length direction of the ground rail 7 meets the design requirements; the slide 6 is installed on the ground rail 7 to ensure that the slide 6 can slide smoothly along the ground rail 7; the connecting section 41 of the swing seat 4 is connected to the slide 6 through the first rotating shaft 5 to ensure that the swing seat 4 can swing flexibly around the first rotating shaft 5.

[0044] Rotate the inner end of the counterweight arm 15 to the contour section 42 of the swing seat 4, adjust the counterweight arm 15 to the initial test angle using an angle scale, and then fix the adapter 14 to the outer end of the counterweight arm 15 with bolts to ensure that the adapter 14 and the counterweight arm 15 fit tightly and are not loose.

[0045] Experimental operation steps:

[0046] After assembly, check whether the connections of each component are firm, whether the rotation is flexible, and whether the slide 6 moves smoothly. Start the actuator 2 for no-load testing to ensure that the force sensor 13 collects data normally and that the traction rope 3 is not tangled or stuck.

[0047] According to the test plan, the counterweight arm 15 is rotated to the first test position by using the angle scale of the contour section 42 of the swing seat 4, and the relative position of the counterweight arm 15 and the swing seat 4 is locked.

[0048] Start the actuator 2, control the traction rope 3 to slowly pull the end of the counterweight arm 15 upward. At the same time, the swing seat 4 rotates around the first rotating shaft 5, the slide 6 moves along the ground rail 7, and the actuator 2 rotates with the second hanging seat 9, and the second hanging seat 9 rotates with the first hanging seat 8. Gradually, the upper end, lower end and the center of the first rotating shaft 5 are collinear. At this time, the test state calibration is completed, and the angle between the traction force and the counterweight arm 15 is 45°.

[0049] According to the test requirements, the preset load is gradually applied through the actuator 2, and the load magnitude is monitored in real time by the force sensor 13 to keep the load stable. The centrifugal load fatigue test is carried out continuously, and the test data is recorded.

[0050] After completing the current state test, unload the load, adjust the counterweight arm angle by 15 degrees or the position of relevant components, and repeat the above steps to complete the test verification under different working conditions.

[0051] After all test conditions are completed, shut off actuator 2, unload all loads, disassemble counterweight arm 15 and all components, clean and maintain the device, and store it properly.

[0052] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0054] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0055] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0056] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A centrifugal load fatigue testing device for a counterweight arm, characterized in that, include: Gantry frame; An actuator, which is suspended on the gantry frame; The traction rope has its upper end connected to the actuator cylinder and its lower end connected to the outer end of the counterweight arm. A swing seat, the upper end of which is rotatably connected to the inner end of the counterweight arm, so that the counterweight arm can rotate along the axis of the swing seat; A slide block, wherein the lower end of the slide block is rotatably connected to the swing block via a first rotating shaft, enabling the swing block to swing around the first rotating shaft; The ground rail is parallel to the length of the first rotating shaft and slides in conjunction with the slide block.

2. The centrifugal load fatigue testing device for the counterweight arm according to claim 1, characterized in that, It also includes a first hanger and a second hanger. The first hanger is installed on the gantry frame. The second hanger is rotatably connected to the first hanger via a second rotating shaft. The second hanger is rotatably connected to the actuating cylinder via a third rotating shaft. The second rotating shaft is perpendicular to the third rotating shaft.

3. The centrifugal load fatigue testing device for the counterweight arm according to claim 2, characterized in that, It also includes a fixing seat, which is installed on the gantry frame. The fixing seat has multiple threaded holes, and the first hanging seat is installed in the threaded holes by bolts.

4. The centrifugal load fatigue testing device for the counterweight arm according to claim 3, characterized in that, The axial height of the swing seat is equal to the length of the counterweight arm.

5. The centrifugal load fatigue testing device for the counterweight arm according to claim 4, characterized in that, The swing seat includes an integrally connected connecting section and a contoured section. The shape of the contoured section is consistent with the shape of the blade. The connecting section is connected to the slide via a first rotating shaft.

6. The centrifugal load fatigue testing device for the counterweight arm according to claim 5, characterized in that, An angle scale is provided on the end face of the contour section near the edge.

7. The centrifugal load fatigue testing device for the counterweight arm according to any one of claims 1-6, characterized in that, A force sensor is installed between the actuator and the traction rope.

8. The centrifugal load fatigue testing device for the counterweight arm according to any one of claims 1-6, characterized in that, It also includes an adapter, which is installed at the outer end of the counterweight arm and connected to the lower end of the traction rope.

9. The centrifugal load fatigue testing device for the counterweight arm according to claim 8, characterized in that, The inner wall of the adapter fits against the surface of the counterweight arm and is connected by bolts.

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