A centrifugal load test device for a propeller hub

Abstract

The present invention discloses a centrifugal load test device for a hub, which comprises a base, a connecting bracket, a hub, a blade simulation part, a pulley, a steel wire rope and a test oil cylinder, wherein the connecting bracket is fixedly connected to the top of the base, and the hub is fixed to the top of the connecting bracket; the blade simulation parts are grouped in pairs and are respectively relatively fixedly connected to the two sides of the hub; a pulley is rotatably provided at one end of the blade simulation part away from the hub, the test oil cylinder is divided into two groups and respectively corresponds to the two blade simulation parts one by one, a tension sensor is fixedly provided at the free end of the test oil cylinder, a connecting roller is provided on the elastic body of the tension sensor, and the pulley at one end of the hub adjacent to the test oil cylinder is fixedly connected by the steel wire rope; the test oil cylinder and the tension sensor are respectively electrically connected to an external servo control system, and the test of the present invention is convenient for testing and has accurate measurement results.

Description

Technical Field

[0001] The invention relates to a centrifugal load testing device, in particular to a hub centrifugal load testing device. Background Art

[0002] The hub is an important moving part in the working process of the propeller, bearing most of the centrifugal loads generated by the rotation of the propeller. Therefore, the strength performance of the hub needs to be verified through tests. During the fatigue test, static test, and stress-strain distribution test of the propeller hub, since the propeller hub is fixed, it is impossible to generate centrifugal loads by rotating.

[0003] During the static tests of the hub, such as fatigue tests, static tests, and stress-strain distribution tests, a reliable method of applying the hub centrifugal load test is extremely important.

[0004] Therefore, how to provide a centrifugal load test device that does not require the hub to rotate is a problem that those skilled in the art urgently need to solve. Summary of the invention

[0005] In view of this, the present invention provides a centrifugal load test device for a hub, which can test and obtain the fatigue strength of the hub when the hub is in a static state.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a hub centrifugal load test device, which includes a base, a connecting bracket, a hub, a blade simulation part, a pulley, a wire rope and a test cylinder, the connecting bracket is fixedly connected to the top of the base, and the hub is fixed on the top of the connecting bracket; the blade simulation parts are grouped in pairs and are respectively fixedly connected to the two sides of the hub relatively; a pulley is rotatably provided at one end of the blade simulation part away from the hub, the test cylinder is divided into two groups and is respectively arranged one by one with the two blade simulation parts, a tension sensor is fixedly provided at the free end of the test cylinder, a connecting roller is arranged on the elastic body of the tension sensor, and the pulley at one end of the hub adjacent to the test cylinder is fixedly connected by the wire rope; the test cylinder and the tension sensor are respectively electrically connected to an external servo control system.

[0007] The beneficial effects of the present invention are: the propeller hub is fixedly connected to the base, and the connecting bracket replaces the propeller shaft, which can reduce the test cost and simplify the test structure. The test cylinders are arranged on the opposite sides of the propeller hub, and the free ends of the test cylinders are connected to the blade simulation parts on the propeller hub through wire ropes to create a blade rotation test environment. During the test, only the applied force load of the test cylinder needs to be controlled by the servo control system, and the two relatively arranged test cylinders act alternately to simulate the centrifugal load and complete the fatigue strength test. The test operation is simple, and the results of the fatigue test, static test and stress-strain distribution test can be obtained without the actual rotation of the propeller hub, which is efficient and low in cost.

[0008] Preferably, the rotating surface of the hub is parallel to the plane where the free end extension and retraction direction of the test cylinder is located; the rotating surface is the horizontal plane on which the hub and the blades rotate; the installation axis of the connecting roller and the installation axis of the pulley are both horizontally located on the rotating surface of the hub.

[0009] Preferably, the connecting bracket is a cylindrical structure, and connecting flanges are respectively provided at both ends thereof, and are respectively fixedly connected to the base and the hub.

[0010] Preferably, a connecting rod frame is fixed on the outer shell of the test oil cylinder, and the rod frame is fixedly connected to the ground.

[0011] Preferably, the steel wire rope is elliptical and is sleeved on the pulley and the connecting roller.

[0012] Preferably, the test cylinders are arranged horizontally, and the extension and retraction directions of the free ends of the corresponding two test cylinders are collinear with the center of the hub.

[0013] Preferably, the test cylinder is a servo hydraulic cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The figure is an overall diagram of a hub centrifugal load testing device of the present invention.

[0015] 1 base, 2 connecting bracket, 3 hub, 4 blade simulation, 5 pulley, 6 wire rope, 7 test cylinder, 8 tension sensor, 9 connecting roller, 10 rod bracket. DETAILED DESCRIPTION

[0016] 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.

[0017] See the attached Figure 1 According to an embodiment of the present invention, a hub centrifugal load test device includes a base 1, a connecting bracket 2, a hub 3, a blade simulation part 4, a pulley 5, a wire rope 6 and a test cylinder 7. The connecting bracket 2 is fixedly connected to the top of the base 1, and the hub 3 is fixed to the top of the connecting bracket 2; the blade simulation parts 4 are grouped in pairs and are relatively fixedly connected to the two sides of the hub 3 respectively; a pulley 5 is rotatably provided at one end of the blade simulation part 4 away from the hub 3, and the test cylinder 7 is divided into two groups and corresponds to the two blade simulation parts 4 one by one, respectively, and a tension sensor 8 is fixedly provided at the free end of the test cylinder 7, and a connecting roller 9 is provided on the elastic body of the tension sensor 8, and is fixedly pulled and connected to the pulley at one end of the hub 3 adjacent to it through a wire rope 6; the test cylinder 7 and the tension sensor 8 are electrically connected to the external servo control system respectively.

[0018] Specifically, the tension sensor is any one of an S-type tension sensor and a plate-ring tension sensor.

[0019] In some specific embodiments, the rotating surface of the hub 3 is parallel to the plane where the free end extension and retraction direction of the test cylinder 7 is located; the rotating surface is the horizontal plane on which the hub and the blades rotate; the installation axis of the connecting roller 9 and the installation axis of the pulley 5 are both horizontally located on the rotating surface of the hub 3, so as to obtain measurement results consistent with the actual rotation state of the hub.

[0020] In some embodiments, the connecting bracket 2 is a cylindrical structure, and connecting flanges are respectively provided at both ends thereof, and are fixedly connected to the base 1 and the hub 3 respectively.

[0021] In other specific embodiments, a rod frame 10 is fixedly connected to the outer shell of the test oil cylinder 7. The rod frame 10 is fixedly connected to the ground, which can facilitate the adjustment of the height of the test oil cylinder and the wiring.

[0022] In some other embodiments, the steel wire rope 6 is elliptical and is sleeved on the pulley 5 and the connecting roller 9 .

[0023] Specifically, the setting of the wire rope ensures that the tension of the test cylinder is in line with the rotating surface of the propeller hub during the tensile test, thereby obtaining accurate test results.

[0024] In some other specific embodiments, the test cylinders 7 are arranged horizontally, and the extension and retraction directions of the corresponding two test cylinders 7 are collinear with the center of the hub 3, so as to ensure that accurate centrifugal load results are obtained.

[0025] Specifically, the test cylinder 7 is a servo hydraulic cylinder, which is convenient for adjusting the size of the centrifugal load through a servo control system.

[0026] The invention discloses a centrifugal load test device for a propeller hub, which simulates the centrifugal load through two relatively arranged test cylinders to measure the fatigue strength, static test and stress-strain distribution of the propeller hub. Compared with the traditional rotation test, the torque and motor power limitations are reduced, a larger centrifugal force can be quickly achieved, and the measurement results can be obtained.

[0027] The specific test steps are as follows: the propeller hub is installed on the base through the connecting bracket, which acts as a propeller shaft simulation part. The propeller blade simulation part is installed on the propeller sleeve of the propeller hub, and then connected to the test cylinder through the pulley, wire rope, and tension sensor. The tension sensor can measure the size of the centrifugal load, and the test cylinder can control the output load size through the servo control system. The pulley can ensure that the upper and lower wire ropes are subjected to the same force, thereby ensuring that the centrifugal load is coaxial with the axis of the propeller hub and propeller sleeve.

[0028] As for the device and the method of use disclosed in the embodiment, since they correspond to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0029] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hub centrifugal load test device, characterized in that: The invention comprises a base (1), a connecting bracket (2), a hub (3), a blade simulation part (4), a pulley (5), a wire rope (6) and a test oil cylinder (7), wherein the connecting bracket (2) is fixedly connected to the top of the base (1), and the hub (3) is fixed to the top of the connecting bracket (2); the blade simulation parts (4) are grouped in pairs and are respectively relatively fixedly connected to the two sides of the hub (3); a pulley (5) is rotatably provided at one end of the blade simulation part (4) away from the hub (3); and the test oil cylinder (7) There are two groups of test cylinders (7) which are respectively arranged in one-to-one correspondence with the two blade simulation parts (4); a tension sensor (8) is fixedly provided at the free end of the test cylinder (7); a connecting roller (9) is arranged on the elastic body of the tension sensor (8), and the tension sensor (8) is fixedly connected to the pulley at one end of the adjacent hub (3) through the steel wire rope (6); the steel wire rope (6) is elliptical and is sleeved on the pulley (5) and the connecting roller (9); the test cylinder (7) and the tension sensor (8) are respectively electrically connected to an external servo control system; During the test, it is only necessary to control the applied force load of the test cylinder through the servo control system, and the two test cylinders set opposite to each other act alternately to simulate the centrifugal load and complete the fatigue strength test.

2. A hub centrifugal load test device according to claim 1, characterized in that: The rotating surface of the hub (3) is parallel to the plane where the free end of the test cylinder (7) is telescopically located; the rotating surface is a horizontal plane on which the hub and the blades rotate; the installation axis of the connecting roller (9) and the installation axis of the pulley (5) are both horizontally located on the rotating surface of the hub (3).

3. A hub centrifugal load test device according to claim 1, characterized in that: The connecting bracket (2) is a cylindrical structure, with connecting flanges provided at both ends thereof, and fixedly connected to the base (1) and the hub (3) respectively.

4. A hub centrifugal load test device according to claim 1, characterized in that: A rod frame (10) is fixedly connected to the outer shell of the test oil cylinder (7), and the rod frame (10) is fixedly connected to the ground.

5. The hub centrifugal load test device according to claim 1, characterized in that: The test oil cylinders (7) are arranged horizontally, and the extension and retraction directions of the free ends of the two corresponding test oil cylinders (7) are collinear with the center of the hub (3).

6. A hub centrifugal load test device according to any one of claims 1 to 5, characterized in that: The test oil cylinder (7) is a servo hydraulic oil cylinder.

Images