Bearing testing machine for automatic inclinator of unmanned helicopter

Abstract

An unmanned helicopter automatic inclinator bearing testing machine disclosed by the present invention comprises a test platform, a main body rack, a gantry loading support and a loading force arm, the main body rack is installed on the test platform, two ends of the gantry loading support are fixed on the test platform and stretch across the main body rack, and a to-be-tested bearing is installed on the upper side surface of the main body rack. The loading force arm is installed on the upper side face of the main body rack and located at the upper end of a bearing to be tested, the gantry loading support is provided with an axial load servo loading hydraulic cylinder and an overturning force simulation servo loading hydraulic cylinder, and a push rod of the gantry loading support faces downwards and is matched with the loading force arm to apply axial load and overturning force to the bearing to be tested. The device can simulate the real working condition of the automatic inclinator bearing of the unmanned helicopter for testing, accurately applies an axial load and an overturning force, provides reliable data for the performance test of the bearing, and facilitates the improvement of the quality and reliability of the automatic inclinator bearing of the unmanned helicopter.

Description

Technical Field

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

[0002] As the core component of the rotor system, the performance of the automatic tilt bearing of unmanned helicopters directly affects flight stability and reliability. In the existing technology, traditional metal bearings face multiple challenges under complex working conditions: on the one hand, the automatic tilt bearing is subjected to alternating overturning torque and dynamic load during high-frequency pitch-changing operations, which causes skew wear on the bearing raceway and seals, and the sealing structure of traditional double-row angular contact ball bearings is prone to lubricating oil leakage or increased friction torque due to coaxiality errors of the inner and outer rings; on the other hand, metal materials are prone to contact fatigue peeling and adhesive wear when rotating at high speeds, especially in high temperature, high humidity or dusty environments, where corrosion and abrasive wear accelerate bearing failure.

[0003] Therefore, in the process of producing automatic tilt bearings for unmanned helicopters, 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 no equipment in the existing technology that can well realize the testing of automatic tilt bearings for unmanned helicopters. Summary of the invention

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

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an unmanned helicopter automatic inclinator bearing testing machine, comprising a test platform, a main body frame, a gantry loading bracket and a loading arm, the main body frame is installed on the test platform, the two ends of the gantry loading bracket are fixed on the test platform and span across the top of the main body frame, the bearing to be tested is installed on the upper side surface of the main body frame, the loading arm is installed on the upper side surface of the main body frame, and is located at the upper end of the bearing to be tested, and an axial load servo loading hydraulic cylinder and a tipping force simulation servo loading hydraulic cylinder are provided on the gantry loading bracket, and the push rods of the axial load servo loading hydraulic cylinder and the tipping force simulation servo loading hydraulic cylinder are arranged downward to cooperate with the loading arm to apply axial load and tipping 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 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, and the sliding column 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 respectively 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 and 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 is hinged with the end of the loading rod by passing the sliding column through the end of the loading rod.

[0010] As a further improvement of the patent of the present 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 plate is fixed at the lower end of the detection rod, and the detection plate 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, 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 patent of the present invention: Compared with the traditional bearing test method, the unmanned helicopter automatic tilter bearing tester of the present invention can simulate the axial load and overturning force that the unmanned helicopter automatic tilter bearing is actually borne during operation, and test the bearing performance more accurately. By setting a test motor to drive the test fixture to rotate, the working condition of the outer ring of the bearing can be simulated, making the test environment closer to the actual application scenario. The reasonable design and coordination of each component, 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 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 It is an overall structural diagram of the unmanned helicopter automatic tilter bearing tester of the present invention; Figure 2 for Figure 1 The overall structure diagram of the middle loading arm part; Figure 3 for Figure 1 The overall structure diagram of the main frame part. DETAILED DESCRIPTION

[0014] The present invention will be further described below in detail with reference to the embodiments shown in the accompanying drawings.

[0015] 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 installed on the test platform 1, and the two ends of the gantry loading bracket 3 are fixed on the test platform 1 and span the top of the main frame 2. The bearing to be tested is installed on the upper side of the main frame 2, and the loading arm 4 is installed on the upper side of the main frame 2, at the upper end of the bearing to be tested. The gantry loading bracket 3 is provided with an axial load servo loading hydraulic cylinder 5 and a tipping force simulation servo loading hydraulic cylinder 6, and the push rods of the axial load servo loading hydraulic cylinder 5 and the tipping force simulation servo loading hydraulic cylinder 6 are arranged downward to cooperate with the loading arm 4 to apply axial load and tipping force to the bearing to be tested. This structure can conveniently perform axial load and tipping force loading tests on the bearing to be tested, improve the operability of the test, and use the axial load servo loading hydraulic cylinder 5 and the tipping force simulation servo loading hydraulic cylinder 6 to simply and effectively apply axial load and tipping force to the bearing to be tested through the loading arm 4.

[0016] Further, see 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 mandrel 44 is fixed in the middle of the loading rod 43. The lower end of the tooling mandrel 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.

[0017] Furthermore, a waist-shaped hole 421 is formed on the side wall of the 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, and the sliding column 431 is slidably arranged in 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 two ends of the loading rod 43 can be tilted at will by sliding the sliding column 431 in the waist-shaped hole 421, and the rotation will not be generated due to the application of torque, thereby ensuring the stability and adaptability of the loading force arm 4 during the test.

[0018] Further, see Figure 1 As shown, two overturning force simulation servo loading hydraulic cylinders 6 are provided, which are respectively located on both sides 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 provided with a loading head to move downward to counter the tooling mandrel 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, 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. Such an arrangement can more accurately simulate the overturning force of the bearing to be tested in actual working conditions, provide more practical conditions for the test, and improve the reliability of the test results.

[0019] 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, so that the lower end of the push rod of the overturning force simulation servo loading hydraulic cylinder 6 is hinged to the end of the loading rod 43 by passing the sliding column 431 through the end of the loading rod 43. This hinge method further optimizes the structural connection, ensures the effective transmission of force, makes the test process more stable, improves the reliability of the test results, and also uses the least number of components, making the overall structure simpler and more reliable.

[0020] Further, see Figure 1As shown, 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 sheet 53 is fixed at the lower end of the detection rod 52, and the detection sheet 53 is sleeved on the push rod of the axial load servo loading hydraulic cylinder 5. This setting can monitor the displacement of the push rod of the axial load servo loading hydraulic cylinder 5 in real time, facilitate accurate control of test parameters, and improve the accuracy and reliability of the test.

[0021] Further, see Figure 3 As shown, a test hole is provided at the center of the upper side of the main frame 2, and a test fixture 21 is rotatably provided in the test hole. The bearing to be tested is installed in the test fixture 21. 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. This structure can simulate the actual working rotation of the bearing to be tested, making the test closer to the real working condition and improving the validity of the test results.

[0022] In summary, this scheme, 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 inside 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.

[0023] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An unmanned helicopter automatic tilt bearing tester, characterized in that: The invention comprises a test platform (1), a main frame (2), a gantry loading bracket (3) and a loading arm (4), wherein the main frame (2) is mounted on the test platform (1), the two ends of the gantry loading bracket (3) are fixed on the test platform (1) and straddle the top of 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) 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 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 arranged downwards to cooperate with the loading arm (4) to apply axial load and tipping force to the bearing to be tested.

2. The unmanned helicopter automatic tilter bearing tester according to claim 1, characterized in that: The loading force arm (4) comprises a loading rod (43), two anti-rotation bases (41) and an anti-rotation rod 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 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.

3. The unmanned helicopter automatic tilter bearing tester according to claim 2, characterized in that: A waist-shaped hole (421) is formed 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), wherein the sliding column (431) is slidably disposed in the waist-shaped hole (421).

4. The unmanned helicopter automatic tilt bearing tester according to claim 3, 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 abut against 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).

5. The unmanned helicopter automatic tilter bearing tester according to claim 4, 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) is hinged to the end of the loading rod (43) by means of the sliding column (431) passing through the end of the loading rod (43).

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

7. The unmanned helicopter automatic tilter bearing tester according to any one of claims 1 to 4, characterized in that: A test hole is provided at the center of the upper side surface of the main frame (2), a test fixture (21) is rotatably provided in the test hole, the bearing to be tested is mounted 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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