Unmanned helicopter automatic tilter bearing testing machine

Abstract

The present invention discloses a test machine for an unmanned helicopter automatic tilter bearing, comprising a test platform, a main frame, a gantry loading bracket, and a loading lever arm. The main frame is mounted on the test platform, the gantry loading bracket is fixed at both ends to the test platform and spans above the main frame, the bearing to be tested is mounted on the upper side of the main frame, the loading lever arm is mounted on the upper side of the main frame and located above the bearing to be tested, and the gantry loading bracket is equipped with an axial load servo loading hydraulic cylinder and a tipping force simulation servo loading hydraulic cylinder, the push rod of which is downward and cooperates with the loading lever arm to apply axial load and tipping force to the bearing to be tested. The present invention can simulate the actual working conditions of the unmanned helicopter automatic tilter bearing for testing, accurately apply axial load and tipping force, provide reliable data for bearing performance testing, and help improve the quality and reliability of the unmanned helicopter automatic tilter bearing.

Description

Technical Field

[0001] The invention relates to a testing device, and more particularly to an unmanned helicopter automatic tilter bearing testing machine. Background Art

[0002] As a core component of the rotor system, the performance of the automatic tilt mechanism bearings in unmanned helicopters directly impacts flight stability and reliability. Conventional metal bearings face multiple challenges under complex operating conditions. First, the automatic tilt mechanism is subjected to alternating tilting torques and dynamic loads during high-frequency pitch-change operations, leading to skew wear on the bearing raceways and seals. The sealing structure of traditional double-row angular contact ball bearings is susceptible to lubricant leakage or increased friction torque due to misalignment of the inner and outer rings. Second, metal materials are susceptible to contact fatigue, spalling, and adhesive wear during high-speed rotation. Corrosion and abrasive wear accelerate bearing failure, particularly in high-temperature, high-humidity, or dusty environments.

[0003] Therefore, during the production process of unmanned helicopter automatic tilt bearings, it is necessary to test the bearing performance to test whether the bearings can meet the use requirements during the use of the unmanned helicopter. However, there is currently no equipment in the existing technology that can well implement the testing of unmanned helicopter automatic tilt bearings. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the object of the present invention is to provide an unmanned helicopter automatic tilt bearing testing machine that can effectively test the performance of the unmanned helicopter automatic tilt bearing.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an unmanned helicopter automatic tilter bearing testing machine, comprising a test platform, a main body stand, a gantry loading bracket and a loading arm, the main body stand being installed on the test platform, the two ends of the gantry loading bracket being fixed on the test platform and spanning above the main body stand, the bearing to be tested being installed on the upper side surface of the main body stand, the loading arm being installed on the upper side surface of the main body stand, at the upper end of the bearing to be tested, an axial load servo loading hydraulic cylinder and an overturning force simulation servo loading hydraulic cylinder being provided on the gantry loading bracket, the push rods of the axial load servo loading hydraulic cylinder and the overturning force simulation servo loading hydraulic cylinder being arranged downward to cooperate with the loading arm to apply axial load and overturning force to the bearing to be tested.

[0006] As a further improvement of the patent of the present invention, the loading force arm includes a loading rod, two anti-rotation bases and an anti-rotation rod arm. A tooling core shaft is fixed to the middle part of the loading rod, and the lower end of the tooling core shaft is inserted into the bearing to be tested. The two anti-rotation bases are respectively fixedly installed on the upper side of the main frame and are located on both sides of the bearing to be tested. One end of the two anti-rotation rod arms is hinged to the two anti-rotation bases one by one, and the other end is slidably connected to the two ends of the loading rod so that the loading rod spans above the bearing to be tested.

[0007] As a further improvement of the patent of the present invention, a waist-shaped hole is provided on the side wall of the anti-rotation lever arm at one end away from the anti-rotation base, and a sliding column is provided at the end of the loading rod, which can be slidably arranged in the waist-shaped hole.

[0008] As a further improvement of the patent of the present invention, two overturning force simulation servo loading hydraulic cylinders are provided, which are located on both sides of the axial load servo loading hydraulic cylinder. The push rod of the axial load servo loading hydraulic cylinder is connected to a pressure sensor and is also provided with a loading head to move downward to counteract the tooling core shaft. The two overturning force simulation servo loading hydraulic cylinders are respectively arranged above the two ends of the loading rod, and the ends of the push rods of the two overturning force simulation servo loading hydraulic cylinders are hinged to the ends of the loading rod.

[0009] As a further improvement of the patent of the present invention, a hinge block is fixed to the lower end of the push rod of the overturning force simulation servo loading hydraulic cylinder, and the end of the sliding column is fixedly installed on the hinge block, so that the lower end of the push rod of the overturning force simulation servo loading hydraulic cylinder and the end of the loading rod are hinged by passing the sliding column through the end of the loading rod.

[0010] As a further improvement of the patent of this invention, a displacement sensor is provided on the side wall of the cylinder body of the axial load servo loading hydraulic cylinder, and a detection rod is provided at the lower end of the displacement sensor. A detection piece is fixed at the lower end of the detection rod, and the detection piece is sleeved on the push rod of the axial load servo loading hydraulic cylinder.

[0011] As a further improvement of the patent of the present invention, a test hole is opened at the center of the side surface of the main frame, and a test fixture is rotatably provided in the test hole. The bearing to be tested is installed in the test fixture, and a test motor linked to the test fixture is provided in the main frame to drive the test fixture to rotate, thereby driving the outer ring of the shaft to be tested to rotate.

[0012] Beneficial effects of the present invention: Compared with traditional bearing testing methods, the unmanned helicopter automatic tilter bearing testing machine of the present invention can simulate the axial load and overturning force that the unmanned helicopter automatic tilter bearing is actually subjected to during operation, and can test the bearing performance more accurately. By setting a test motor to drive the test fixture to rotate, the working condition of the bearing outer ring rotation can be simulated, making the test environment closer to the actual application scenario. The reasonable design and coordination of various components, such as the structural design of the loading arm, the connection method between the hydraulic cylinder and the loading rod, etc., ensure the stability and accuracy of the load application, improve the reliability of the test results, and provide an effective technical means for the research and development and quality inspection of unmanned helicopter automatic tilter bearings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is an overall structural diagram of the unmanned helicopter automatic tilter bearing testing machine of the present invention;

[0014] Figure 2 for Figure 1 The overall structure diagram of the middle loading arm part;

[0015] Figure 3 for Figure 1 The overall structure diagram of the main body frame part. DETAILED DESCRIPTION

[0016] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0017] Reference Figure 1 As shown, the unmanned helicopter automatic tilter bearing tester of this embodiment includes a test platform 1, a main frame 2, a gantry loading bracket 3, and a loading arm 4. The main frame 2 is mounted on the test platform 1. The gantry loading bracket 3 is fixed to the test platform 1 at both ends and spans above the main frame 2. The bearing to be tested is mounted on the upper side of the main frame 2. The loading arm 4 is mounted on the upper side of the main frame 2, above the bearing to be tested. The gantry loading bracket 3 is equipped with an axial load servo loading hydraulic cylinder 5 and a tipping force simulation servo loading hydraulic cylinder 6. The push rods of the axial load servo loading hydraulic cylinder 5 and the tipping force simulation servo loading hydraulic cylinder 6 are positioned downward to cooperate with the loading arm 4 to apply axial load and tipping force to the bearing to be tested. This structure facilitates axial load and tipping force loading tests on the bearing to be tested, improving the operability of the test. Utilizing the axial load servo loading hydraulic cylinder 5 and the tipping force simulation servo loading hydraulic cylinder 6, the axial load and tipping force can be simply and effectively applied to the bearing to be tested via the loading arm 4.

[0018] Further, refer to Figure 2As shown, the loading lever arm 4 includes a loading rod 43, two anti-rotation bases 41 and an anti-rotation lever arm 42. A tooling core shaft 44 is fixed in the middle of the loading rod 43. The lower end of the tooling core shaft 44 penetrates into the bearing to be tested. The two anti-rotation bases 41 are respectively fixedly mounted on the upper side of the main frame 2 and are located on both sides of the bearing to be tested. One end of the two anti-rotation lever arms 42 is hinged to the two anti-rotation bases 41 in a one-to-one correspondence, and the other end is slidably connected to the two ends of the loading rod 43 so that the loading rod spans above the bearing to be tested. This structural design enables the loading lever arm 4 to better cooperate with the test, accurately transfer the load to the bearing to be tested, and improve the accuracy of the test.

[0019] Furthermore, a waist-shaped hole 421 is formed in the side wall of the end of the anti-rotation lever arm 42 away from the anti-rotation base 41, and a sliding post 431 is provided at the end of the loading rod 43. The sliding post 431 is slidably disposed within the waist-shaped hole 421. This design makes the connection between the loading rod 43 and the anti-rotation lever arm 42 more flexible. During the overturning force loading process, the sliding post 431 slides within the waist-shaped hole 421 to achieve the arbitrary tilting of the two ends of the loading rod 43, and the rotation will not occur due to the application of torque, thus ensuring the stability and adaptability of the loading arm 4 during the test.

[0020] Further, refer to Figure 1 As shown, two overturning force simulation servo loading hydraulic cylinders 6 are provided, one on each side of the axial load servo loading hydraulic cylinder 5. The push rod of the axial load servo loading hydraulic cylinder 5 is connected to a pressure sensor and is also equipped with a loading head, which moves downward to abut against the tooling core shaft 44. The two overturning force simulation servo loading hydraulic cylinders 6 are respectively arranged above the ends of the loading rod 43, and the ends of the push rods of the two overturning force simulation servo loading hydraulic cylinders 6 are hinged to the ends of the loading rod 43. This arrangement can more accurately simulate the overturning force experienced by the bearing under test in actual working conditions, provide more realistic test conditions, and improve the reliability of the test results.

[0021] Furthermore, a hinge block 61 is fixed to the lower end of the push rod of the overturning force simulation servo loading hydraulic cylinder 6, and the end of the sliding column 431 is fixedly mounted on the hinge block 61. The sliding column 431 passes through the end of the loading rod 43 to achieve an articulated connection between the lower end of the push rod of the overturning force simulation servo loading hydraulic cylinder 6 and the end of the loading rod 43. This articulated connection further optimizes the structural connection, ensures effective force transmission, makes the test process more stable, and improves the reliability of the test results. It also uses a minimum number of components, making the overall structure simpler and more reliable.

[0022] Further, refer to Figure 1As shown, a displacement sensor 51 is installed on the side wall of the axial load servo loading hydraulic cylinder 5. A detection rod 52 is installed at the lower end of the displacement sensor 51. A detection plate 53 is fixed to the lower end of the detection rod 52. The detection plate 53 is sleeved on the push rod of the axial load servo loading hydraulic cylinder 5. This arrangement can monitor the displacement of the push rod of the axial load servo loading hydraulic cylinder 5 in real time, facilitating precise control of test parameters and improving test accuracy and reliability.

[0023] Further, refer to Figure 3 As shown, a test hole is provided at the center of the upper side of the main frame 2. A test fixture 21 is rotatably mounted within the hole. The bearing to be tested is mounted within the fixture 21. A test motor is installed within the main frame 2 and is linked to the fixture 21 to drive the fixture 21, which in turn rotates the outer ring of the shaft to be tested. This structure simulates the actual operating rotation of the bearing to be tested, making the test closer to real-world conditions and improving the validity of the test results.

[0024] In summary, this solution, through the reasonable design and coordination of components such as the test platform 1, the main stand 2, the gantry loading bracket 3, the loading arm 4, and the refined structure of each component, such as the specific structure of the loading arm 4, the connection method between each hydraulic cylinder and the loading arm 4, the setting of the displacement sensor 51, the driving structure of the test fixture 21, etc., can conveniently carry out axial load and overturning force loading tests, accurately simulate actual working conditions, and monitor test parameters in real time, thereby effectively realizing the performance test of the automatic tilter bearing of the unmanned helicopter.

[0025] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An unmanned helicopter automatic tilter bearing testing machine, characterized by: The invention comprises a test platform (1), a main frame (2), a gantry loading bracket (3) and a loading force arm (4), wherein the main frame (2) is mounted on the test platform (1), both ends of the gantry loading bracket (3) are fixed on the test platform (1) and span the upper part of the main frame (2), the bearing to be tested is mounted on the upper side of the main frame (2), the loading force arm (4) is mounted on the upper side of the main frame (2) and is located at the upper end of the bearing to be tested, and the gantry loading bracket (3) is provided with an axial load servo loading hydraulic cylinder (5) and an overturning force simulation servo loading hydraulic cylinder (6), the axial load servo loading hydraulic cylinder (5) and the overturning force simulation servo loading hydraulic cylinder (6) are pushed by the axial load servo loading hydraulic cylinder (5) and the overturning force simulation servo loading hydraulic cylinder (6). The rod is arranged downward to cooperate with the loading force arm (4) to apply axial load and overturning force to the bearing to be tested; the loading force arm (4) includes a loading rod (43), two anti-rotation bases (41) and an anti-rotation rod arm (42); a tooling core shaft (44) is fixed to the middle of the loading rod (43); the lower end of the tooling core shaft (44) is inserted into the bearing to be tested; the two anti-rotation bases (41) are respectively fixedly mounted on the upper side of the main frame (2) and are located on both sides of the bearing to be tested; one end of the two anti-rotation rod arms (42) is hinged to the two anti-rotation bases (41) in a one-to-one correspondence, and the other end is slidably connected to the two ends of the loading rod (43) so that the loading rod spans above the bearing to be tested.

2. The unmanned helicopter automatic tilter bearing testing machine according to claim 1, characterized in that: A waist-shaped hole (421) is provided on the side wall of one end of the anti-rotation lever arm (42) away from the anti-rotation base (41), and a sliding column (431) is provided at the end of the loading rod (43). The sliding column (431) is slidably arranged in the waist-shaped hole (421).

3. The unmanned helicopter automatic tilter bearing testing machine according to claim 2, characterized in that: The overturning force simulation servo loading hydraulic cylinders (6) are provided with two, which are respectively located on both sides of the axial load servo loading hydraulic cylinder (5). The pushing rod of the axial load servo loading hydraulic cylinder (5) is connected to a pressure sensor and is also provided with a loading head to move downward to counteract the tooling core shaft (44). The two overturning force simulation servo loading hydraulic cylinders (6) are respectively arranged above the two ends of the loading rod (43) in a one-to-one correspondence. The ends of the pushing rods of the two overturning force simulation servo loading hydraulic cylinders (6) are hinged to the end of the loading rod (43).

4. The unmanned helicopter automatic tilter bearing testing machine according to claim 3, characterized in that: A hinge block (61) is fixed to the lower end of the push rod of the overturning force simulation servo loading hydraulic cylinder (6), and the end of the sliding column (431) is fixedly mounted on the hinge block (61), so that the lower end of the push rod of the overturning force simulation servo loading hydraulic cylinder (6) and the end of the loading rod (43) are hinged by the sliding column (431) passing through the end of the loading rod (43).

5. The unmanned helicopter automatic tilter bearing testing machine according to claim 3 or 4, characterized in that: A displacement sensor (51) is provided on the cylinder side wall of the axial load servo loading hydraulic cylinder (5), and a detection rod (52) is provided at the lower end of the displacement sensor (51). A detection plate (53) is fixed to the lower end of the detection rod (52), and the detection plate (53) is sleeved on the push rod of the axial load servo loading hydraulic cylinder (5).

6. The unmanned helicopter automatic tilter bearing testing machine according to any one of claims 1 to 4, characterized in that: A test hole is provided at the center of the upper side of the main frame (2), a test fixture (21) is rotatably provided in the test hole, the bearing to be tested is installed in the test fixture (21), and a test motor linked to the test fixture (21) is provided in the main frame (2) to drive the test fixture (21) to rotate, thereby driving the outer ring of the shaft to be tested to rotate.

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