Fatigue test loading device for small fish area assembly

Abstract

The invention provides a small fish area assembly fatigue test loading device which comprises a loading fork lug 1, a loading upper connector 2, a loading lower connector 3, sliding fork lugs 4, a bearing seat 5, a bearing connecting piece 6, a cover plate 7, a bottom plate 8, an actuator connecting piece 9, a portal frame 10 and a fixed fork lug 11. The sliding fork lug 4 is connected with the bearing seat 5, the bearing connecting piece 6 and the cover plate 7, so that the two side end parts of the small fish area assembly test piece can only axially move along the small fish area assembly test piece; the cylinder body part of the actuator is fixed by an actuator connecting piece 9, a portal frame 10 and a fixed fork lug 11, so that the loading fork lug 1 connected with a telescopic rod of the actuator can only move along the vertical direction, and the loading upper joint 2, the loading lower joint 3 and the middle part of the small fish area assembly test piece can move along the vertical direction; therefore, the vertical loading of the small fish area assembly test piece is realized.

Description

Technical Field

[0001] The invention belongs to helicopter fatigue test technology, and in particular relates to a small fish area component fatigue test loading device. Background Art

[0002] The flexible beam that realizes the pitch change movement of the blade is an important component of the helicopter's bearingless rotor. The flapping movement of the blade is achieved through the bending deformation of the flexible beam, and the small fish area component is the main load-bearing part of the flexible beam that undergoes bending deformation. Its fatigue performance has a crucial impact on the entire rotor structure.

[0003] At present, no one has conducted fatigue tests on small fish area components, and no one has designed a loading method for fatigue tests on small fish area components. Summary of the invention

[0004] The present application provides a small fish area component fatigue test loading device, which can solve the special constraint problem of releasing axial displacement at both side ends of the small fish area component and constraining displacement in other directions.

[0005] Technical solution: A loading device for fatigue test of small fish area components, comprising a loading fork ear 1, a loading upper joint 2, a loading lower joint 3, a sliding fork ear 4, a bearing seat 5, a bearing connector 6, a cover plate 7, a bottom plate 8, an actuator connector 9, a gantry 10 and a fixed fork ear 11, wherein:

[0006] The rod end of the loading fork ear 1 is connected to the sensor and the actuator through a thread, and the fork ear end of the loading fork ear 1 is connected to the loading upper joint 2 through a bolt. Grooves are arranged inside the loading upper joint 2 and the loading lower joint 3, and the loading upper joint 2, the loading lower joint 3 and the small fish area component test piece are fixed together by bolts to ensure that the loading upper joint 2, the loading lower joint 3 and the small fish area component test piece fit together;

[0007] The fork ear end of the sliding fork ear 4 is connected to the small fish area component test piece by bolts, and the rod end of the sliding fork ear 4 passes through the linear bearing built in the middle of the hole of the bearing connector 6, and the cover plate 7 is fixed to the bearing connector 6 by bolts, which effectively prevents the built-in linear bearing from loosening; a deep groove ball bearing is built in the middle of the hole of the bearing seat 5, and the rods on both sides of the bearing connector 6 pass through the deep groove ball bearing of the bearing seat 5, and the ends of the rods of the bearing connector 6 are fixed by bolts, and the bottom of the bearing seat 5 is fixed to the base plate 8 by bolts; the sliding fork ears 4, bearing seats 5, bearing connectors 6, and cover plates 7 at both ends of the gantry 10 are consistent, releasing the axial displacement of the ends on both sides of the small fish area component and constraining displacement in other directions;

[0008] The actuator connecting part 9 has a built-in linear bearing, a hole is opened in the middle part of the square steel on the top of the gantry 10, the rod end of the fixed fork ear 11 passes through the square steel hole on the top of the gantry 10, and is fixed together by bolt connection, and the fork ear end of the fixed fork ear 11 is connected to the actuator by bolt connection; the actuator connecting part 9 is fixed to the gantry 10 by bolts.

[0009] Furthermore, the width of the grooves set inside the loading upper joint 2 and the loading lower joint 3 is consistent with the width of the small fish area component test piece, and the depth of the grooves is half of the thickness of the small fish area component test piece.

[0010] Furthermore, felt is pasted on the surfaces of the contact parts between the upper loading joint 2, the lower loading joint 3 and the small fish area component test piece to prevent damage to the small fish area component test piece.

[0011] Furthermore, the middle hole of the bearing connector 6 contains two apertures. The aperture on the side close to the small fish area component test piece is 2·r1, where r1 is half of the rod end diameter of the sliding fork ear 4, and the remaining aperture is 2·R1, where R1 is half of the outer diameter of the built-in linear bearing.

[0012] Furthermore, the middle hole of the actuator connector 9 has two apertures. The aperture on the side close to the sensor is 2·r2, where r2 is half the diameter of the actuator telescopic rod, and the remaining aperture is 2·R2, where R2 is half the outer diameter of the built-in linear bearing.

[0013] Furthermore, the outer side of the actuator connecting member 9 is fixed by a shaft elastic retaining ring, which effectively prevents the linear bearing from loosening.

[0014] Furthermore, the gantry 10 is welded by using square steel and A3 steel connecting plates.

[0015] Furthermore, the actuator telescopic rod uses the built-in linear bearing of the actuator connector 9 to prevent the actuator from being connected to the servo valve and oil pipe equipment, which causes the actuator's center of gravity to shift and cause its loading direction to shift, thereby ensuring that the small fish area component test piece is loaded in the vertical direction.

[0016] The present invention provides a loading device for fatigue testing of small fish area components, which solves the special constraint problem of releasing axial displacement at both side ends of the small fish area components and constraining displacement in other directions. It can also avoid the loading direction deviation caused by the center of gravity deviation of the small fish area component test piece caused by additional devices such as the actuator servo valve and oil pipe, and can effectively evaluate the fatigue characteristics of the small fish area components. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a small fish area component fatigue test loading device of the present invention.

[0018] Figure 2It is an isometric view of the bearing connector of the present invention.

[0019] Figure 3 It is an assembly diagram of the bearing seat assembly of the present invention.

[0020] Figure 4 It is an isometric view of the actuator connecting member of the present invention.

[0021] Figure 5 It is an assembly diagram of the actuator connector assembly structure of the present invention.

[0022] Among them, 1-loading fork ear, 2-loading upper joint, 3-loading lower joint, 4-sliding fork ear, 5-bearing seat, 6-bearing connector, 7-cover plate, 8-bottom plate, 9-actuator connector, 10-gantry, 11-fixed fork ear. DETAILED DESCRIPTION

[0023] The small fish area component fatigue test referred to in the present invention requires releasing the axial displacement of the two ends of the small fish area component, constraining the displacement in other directions, and applying a vertical load to the middle part of the small fish area component. In order to explore the fatigue performance of the small fish area component and simulate its actual stress state, a small fish area component fatigue test loading device is designed according to its constraint and loading method.

[0024] like Figure 1 As shown, the present application provides a small fish area component fatigue test loading device, including a loading fork ear 1, a loading upper joint 2, a loading lower joint 3, a sliding fork ear 4, a bearing seat 5, a bearing connector 6, a cover plate 7, a bottom plate 8, an actuator connector 9, a gantry 10, and a fixed fork ear 11, wherein:

[0025] The rod end of the loading fork ear 1 is connected to the sensor and the actuator through a thread, and the fork ear end of the loading fork ear 1 is connected to the loading upper joint 2 through a bolt. Grooves are arranged inside the loading upper joint 2 and the loading lower joint 3, and the loading upper joint 2, the loading lower joint 3 and the small fish area component test piece are fixed together by bolts to ensure that the loading upper joint 2, the loading lower joint 3 and the small fish area component test piece fit together;

[0026] like Figure 3As shown, the fork ear end of the sliding fork ear 4 is connected to the small fish area component test piece by bolts, and the rod end of the sliding fork ear 4 passes through the linear bearing built in the middle of the hole of the bearing connector 6, and the cover plate 7 is fixed to the bearing connector 6 by bolts, which effectively prevents the built-in linear bearing from loosening; a deep groove ball bearing is built in the middle of the hole of the bearing seat 5, and the rods on both sides of the bearing connector 6 pass through the deep groove ball bearings of the bearing seat 5, the ends of the rods of the bearing connector 6 are fixed by bolts, and the bottom of the bearing seat 5 is fixed to the base plate 8 by bolts; the sliding fork ears 4, bearing seats 5, bearing connectors 6, and cover plates 7 at both ends of the gantry 10 are consistent, releasing the axial displacement of the ends on both sides of the small fish area component and constraining displacement in other directions.

[0027] like Figure 5 As shown, the actuator connecting member 9 has a built-in linear bearing, a hole is opened in the middle part of the square steel on the top of the gantry 10, the rod end of the fixed fork ear 11 passes through the square steel hole on the top of the gantry 10, and is fixed together by bolt connection, and the fork ear end of the fixed fork ear 11 is connected to the actuator by bolt connection; the actuator connecting member 9 is fixed to the gantry 10 by bolts.

[0028] Specifically, the width of the grooves set inside the loading upper joint 2 and the loading lower joint 3 is consistent with the width of the small fish area component test piece, and the depth of the grooves is half of the thickness of the small fish area component test piece.

[0029] Specifically, felt is pasted on the surfaces of the contact parts between the upper loading joint 2, the lower loading joint 3 and the small fish area component test piece to prevent damage to the small fish area component test piece.

[0030] Specifically, Figure 2 As shown, the middle hole of the bearing connector 6 contains two apertures. The aperture on the side close to the small fish area component test piece is 2·r1, where r1 is half of the rod end diameter of the sliding fork ear 4, and the remaining aperture is 2·R1, where R1 is half of the outer diameter of the built-in linear bearing.

[0031] Specifically, Figure 4 As shown, the middle hole of the actuator connecting member 9 contains two apertures. The aperture on the side close to the sensor is 2·r2, where r2 is half the diameter of the actuator telescopic rod, and the remaining aperture is 2·R2, where R2 is half the outer diameter of the built-in linear bearing.

[0032] Specifically, the outer side of the actuator connecting member 9 is fixed by a shaft elastic retaining ring, which effectively prevents the linear bearing from loosening.

[0033] Specifically, the gantry 10 is welded by square steel and A3 steel connecting plates.

[0034] Specifically, the actuator telescopic rod uses the built-in linear bearing of the actuator connector 9 to prevent the actuator from connecting to the servo valve and oil pipe equipment, which causes the actuator's center of gravity to shift and cause its loading direction to shift, thereby ensuring that the small fish area component test piece is loaded in the vertical direction.

[0035] Specifically, the working mode of the small fish area component fatigue test loading device is as follows: the two side ends of the small fish area component test piece are connected to the sliding fork ears 4, and the sliding fork ears 4 are connected to the bearing seat 5, the bearing connector 6, and the cover plate 7, to ensure that the two side ends of the small fish area component test piece can only move along the axial direction of the small fish area component test piece; the actuator cylinder part is fixed by the actuator connector 9, the gantry 10, and the fixed fork ear 11, to ensure that the loading fork ear 1 connected to the actuator telescopic rod can only move in the vertical direction, to ensure that the loading upper joint 2, the loading lower joint 3 and the middle part of the small fish area component test piece can move in the vertical direction, thereby realizing the vertical loading of the small fish area component test piece.

[0036] The present invention provides a loading device for fatigue testing of small fish area components, which solves the special constraint problem of releasing axial displacement at both side ends of the small fish area components and constraining displacement in other directions. It can also avoid the loading direction deviation caused by the center of gravity deviation of the small fish area component test piece caused by additional devices such as the actuator servo valve and oil pipe, and can effectively evaluate the fatigue characteristics of the small fish area components.

Claims

1. A small fish area component fatigue test loading device, characterized in that: It comprises a loading fork ear (1), a loading upper joint (2), a loading lower joint (3), a sliding fork ear (4), a bearing seat (5), a bearing connecting piece (6), a cover plate (7), a bottom plate (8), an actuator connecting piece (9), a gantry (10) and a fixed fork ear (11), wherein: The rod end of the loading fork ear (1) is connected to the sensor and the actuator through a thread, the fork ear end of the loading fork ear (1) is connected to the loading upper joint (2) through a bolt, grooves are arranged inside the loading upper joint (2) and the loading lower joint (3), and the loading upper joint (2), the loading lower joint (3) and the small fish area component test piece are fixed together through bolts to ensure that the loading upper joint (2), the loading lower joint (3) and the small fish area component test piece are in close contact with each other; The fork ear end of the sliding fork ear (4) is connected to the small fish area component test piece by bolts, and the rod end of the sliding fork ear (4) passes through the linear bearing built in the middle of the hole of the bearing connector (6). The cover plate (7) is fixed on the bearing connector (6) by bolts, which effectively prevents the built-in linear bearing from loosening; a deep groove ball bearing is built in the middle of the hole of the bearing seat (5), and the rods on both sides of the bearing connector (6) pass through the deep groove ball bearing of the bearing seat (5). The ends of the rods of the bearing connector (6) are fixed by bolts, and the bottom of the bearing seat (5) is fixed to the base plate (8) by bolts; the sliding fork ears (4), the bearing seat (5), the bearing connector (6), and the cover plate (7) at both ends of the gantry (10) are consistent, releasing the axial displacement of the ends of the two sides of the small fish area component and restricting displacement in other directions; The actuator connecting piece (9) has a built-in linear bearing, a hole is opened in the middle of the square steel on the top of the gantry (10), the rod end of the fixed fork ear (11) passes through the square steel hole on the top of the gantry (10), and is fixed together by bolt connection, and the fork ear end of the fixed fork ear (11) is connected to the actuator by bolt connection; the actuator connecting piece (9) is fixed to the gantry (10) by bolts.

2. The device according to claim 1, characterized in that The width of the grooves arranged inside the upper loading joint (2) and the lower loading joint (3) is consistent with the width of the small fish area component test piece, and the depth of the grooves is half the thickness of the small fish area component test piece.

3. The device according to claim 1, characterized in that Felt is pasted on the surfaces of the contact parts between the upper loading joint (2), the lower loading joint (3) and the small fish area component test piece to prevent damage to the small fish area component test piece.

4. The device according to claim 1, characterized in that The middle hole of the bearing connector (6) contains two apertures. The aperture on the side close to the small fish area component test piece is 2·r1, where r1 is half the diameter of the rod end of the sliding fork ear (4), and the remaining aperture is 2·R1, where R1 is half the outer diameter of the built-in linear bearing.

5. The device according to claim 1, characterized in that The middle hole of the actuator connecting piece (9) has two apertures, the aperture on the side close to the sensor is 2·r2, where r2 is half the diameter of the actuator telescopic rod, and the remaining aperture is 2·R2, where R2 is half the outer diameter of the built-in linear bearing.

6. The device according to claim 1, characterized in that The outer side of the actuator connecting piece (9) is fixed by a shaft elastic retaining ring, which effectively prevents the linear bearing from loosening.

7. The device according to claim 1, characterized in that The gantry (10) is welded by square steel and A3 steel connecting plates.

8. The device according to claim 1, characterized in that The actuator telescopic rod is connected to the actuator connecting piece (9) through a linear bearing built in, which prevents the actuator from being connected to a servo valve or oil pipe equipment, causing the actuator's center of gravity to shift and causing its loading direction to shift, thereby ensuring that the small fish area component test piece is loaded in the vertical direction.

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