A small fish regional assembly fatigue test loading device

Abstract

The application provides a small fish area assembly fatigue test loading device, which comprises a loading fork 1, a loading upper joint 2, a loading lower joint 3, a sliding fork 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 11. The small fish area assembly test piece is connected with the sliding fork 4 at both ends, and the sliding fork 4 is connected with the bearing seat 5, the bearing connecting piece 6 and the cover plate 7, so that the both ends of the small fish area assembly test piece can only move along the axial direction of the small fish area assembly test piece. The actuator cylinder part is fixed by the actuator connecting piece 9, the gantry 10 and the fixed fork 11, so that the loading fork 1 connected with the telescopic rod of the actuator can only move along the vertical direction, 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, and the small fish area assembly test piece can be loaded in the vertical direction.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of helicopter fatigue test, in particular to a small fish region assembly fatigue test loading device. BACKGROUND

[0002] The flexible beam realizing the variable pitch motion of the blade is an important component of the bearingless rotor of the helicopter, the flapping motion of the blade is realized through the bending deformation of the flexible beam, and the small fish region assembly is the main bearing part of the flexible beam to bear the bending deformation, and the fatigue performance thereof has a crucial influence on the whole rotor structure.

[0003] At present, no one has carried out the small fish region assembly fatigue test, and no one has designed the small fish region assembly fatigue test loading method. SUMMARY

[0004] The application provides a small fish region assembly fatigue test loading device, which can solve the special constraint problem that the axial displacement of the two side ends of the small fish region assembly is released and the displacement in other directions is constrained.

[0005] Technical scheme: a small fish region assembly fatigue test loading device, comprising a loading yoke 1, a loading upper joint 2, a loading lower joint 3, a sliding yoke 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 yoke 11, wherein:

[0006] The rod end of the loading yoke 1 is connected with a sensor and an actuator through threads, the yoke end of the loading yoke 1 is connected with the loading upper joint 2 through bolts, the loading upper joint 2 and the loading lower joint 3 are internally provided with grooves, and the loading upper joint 2, the loading lower joint 3 and the small fish region assembly test piece are fixed together through bolts, so as to ensure that the loading upper joint 2, the loading lower joint 3 and the small fish region assembly test piece are in close contact;

[0007] The yoke end of the sliding yoke 4 is connected with the small fish region assembly test piece through bolts, the rod end of the sliding yoke 4 passes through the linear bearing built in the middle of the hole of the bearing connecting piece 6, the cover plate 7 is fixed on the bearing connecting piece 6 through bolts, so as to effectively prevent the built-in linear bearing from loosening; the deep groove ball bearing is built in the middle of the hole of the bearing seat 5, the rod pieces on both sides of the bearing connecting piece 6 pass through the deep groove ball bearings of the bearing seat 5, the rod end of the bearing connecting piece 6 is fixed through bolts, and the bottom of the bearing seat 5 is fixed on the bottom plate 8 through bolts; the sliding yoke 4, the bearing seat 5, the bearing connecting piece 6 and the cover plate 7 at both ends of the gantry 10 are consistent, the axial displacement of the two side ends of the small fish region assembly is released, and the displacement in other directions is constrained;

[0008] The actuator connecting piece 9 is internally provided with a linear bearing, the middle part of the square steel at the top of the portal frame 10 is provided with a hole, the rod end of the fixed yoke 11 passes through the hole of the square steel at the top of the portal frame 10 and is fixed together in a bolt connection manner, and the yoke end of the fixed yoke 11 is connected with the actuator in a bolt connection manner; the actuator connecting piece 9 is fixed on the portal frame 10 through bolts.

[0009] Further, the groove width of the groove arranged inside the loading upper joint 2 and the loading lower joint 3 is consistent with the width of the small fish area assembly test piece, and the groove depth is half of the thickness of the small fish area assembly test piece.

[0010] Further, the surface of the contact part of the loading upper joint 2, the loading lower joint 3 and the small fish area assembly test piece is pasted with felt to prevent damage to the small fish area assembly test piece.

[0011] Further, the middle hole of the bearing connecting piece 6 contains two hole diameters, the hole diameter close to the small fish area assembly test piece is 2·r1, r1 is half of the diameter of the rod end of the sliding yoke 4, and the remaining hole diameter is 2·R1, R1 is half of the outer diameter of the built-in linear bearing.

[0012] Further, the middle hole of the actuator connecting piece 9 contains two hole diameters, the hole diameter close to the sensor is 2·r2, r2 is half of the diameter of the actuator telescopic rod, and the remaining hole diameter is 2·R2, R2 is half of the outer diameter of the built-in linear bearing.

[0013] Further, the outer side of the actuator connecting piece 9 is fixed by an elastic retaining ring for shaft, which effectively prevents the loosening of the linear bearing.

[0014] Further, the portal frame 10 is welded by square steel and A3 steel connecting plate.

[0015] Further, the actuator telescopic rod passes through the built-in linear bearing of the actuator connecting piece 9, which prevents the actuator from deviating from the loading direction caused by the deviation of the gravity center of the actuator due to the additional devices such as the actuator servo valve and the oil pipe, and ensures the vertical loading of the small fish area assembly test piece.

[0016] The application provides a small fish area assembly fatigue test loading device, which solves the special constraint problem that the two side ends of the small fish area assembly release axial displacement and constrain displacement in other directions, avoids the deviation of the loading direction caused by the deviation of the gravity center of the small fish area assembly test piece due to additional devices such as the actuator servo valve and the oil pipe, and effectively evaluates the fatigue characteristics of the small fish area assembly. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a schematic view of a small fish area assembly fatigue test loading device.

[0018] Figure 2An isometric view of a bearing connector of the present application.

[0019] Figure 3 An assembly view of a bearing block assembly of the present application.

[0020] Figure 4 An isometric view of an actuator connector of the present application.

[0021] Figure 5 An assembly view of an actuator connector assembly structure of the present application.

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

[0023] The small fish area assembly fatigue test of the present application needs to release the axial displacement of the both ends of the small fish area assembly, constrain the displacement in other directions, and apply a vertical load at the middle part of the small fish area assembly. In order to explore the fatigue performance of the small fish area assembly and simulate the actual stress state, a small fish area assembly fatigue test loading device is designed according to the constraint and loading mode.

[0024] As shown in Figure 1 The present application provides a small fish area assembly fatigue test loading device, which includes a loading fork 1, a loading upper joint 2, a loading lower joint 3, a sliding fork 4, a bearing block 5, a bearing connector 6, a cover plate 7, a bottom plate 8, an actuator connector 9, a gantry 10, and a fixed fork 11.

[0025] The rod end of the loading fork 1 is connected with a sensor and an actuator through threads, and the fork end of the loading fork 1 is connected with the loading upper joint 2 through bolts, the loading upper joint 2 and the loading lower joint 3 are internally provided with grooves, and the loading upper joint 2, the loading lower joint 3 and the small fish area assembly test piece are fixed together through bolts, so as to ensure that the loading upper joint 2, the loading lower joint 3 and the small fish area assembly test piece are in close contact.

[0026] As shown in Figure 3As shown, the sliding yoke 4 yoke end is connected with the small fish area assembly test piece through bolts, the sliding yoke 4 rod end passes through the linear bearing built-in in the middle of the bearing connecting piece 6 hole, the cover plate 7 is fixed on the bearing connecting piece 6 through bolts, effectively prevent the built-in linear bearing loose; the bearing seat 5 hole in the middle is built-in deep groove ball bearing, the bearing connecting piece 6 rod passes through the deep groove ball bearing of the bearing seat 5 on both sides, the bearing connecting piece 6 rod end is fixed through bolts, the bearing seat 5 bottom is fixed on the bottom plate 8 through bolts; the sliding yoke 4, bearing seat 5, bearing connecting piece 6, cover plate 7 at both ends of the gantry 10 are consistent, release the axial displacement of the small fish area assembly both sides end, constrain other direction displacement.

[0027] As shown in Figure 5 , the actuator connecting piece 9 is built-in linear bearing, the gantry 10 top square steel middle part is opened, the fixed yoke 11 rod end passes through the gantry 10 top square steel hole, and is fixed together in the form of bolt connection, the fixed yoke 11 yoke end is connected with the actuator in the form of bolt connection; the actuator connecting piece 9 is fixed on the gantry 10 through bolts.

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

[0029] Specifically, the surface of the contact part between the loading upper joint 2, the loading lower joint 3 and the small fish area assembly test piece is pasted with felt to prevent damage to the small fish area assembly test piece.

[0030] Specifically, as shown in Figure 2 , the middle hole of the bearing connecting piece 6 contains two hole diameters, the hole diameter close to the small fish area assembly test piece side is 2·r1, and r1 is half of the diameter of the rod end of the sliding yoke 4, and the rest of the hole diameter is 2·R1, and R1 is half of the outer diameter of the built-in linear bearing.

[0031] Specifically, as shown in Figure 4 , the middle hole of the actuator connecting piece 9 contains two hole diameters, the hole diameter close to the sensor side is 2·r2, and r2 is half of the diameter of the actuator telescopic rod, and the rest of the hole diameter is 2·R2, and R2 is half of the outer diameter of the built-in linear bearing.

[0032] Specifically, the outside of the actuator connecting piece 9 is fixed by the elastic collar for shaft, which effectively prevents the linear bearing from loosening.

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

[0034] Specifically, the actuator telescopic rod passes through the linear bearing built in the actuator connecting piece 9, prevents the actuator connecting servo valve, oil pipe equipment from causing the offset of the gravity center of the actuator, leads to the offset of the loading direction, and ensures the vertical direction loading of the small fish area assembly test piece.

[0035] Specifically, the working mode of the small fish area assembly fatigue test loading device is as follows: the small fish area assembly test piece is connected with the sliding yoke 4 at both sides, the sliding yoke 4 is connected with the bearing seat 5, the bearing connecting piece 6 and the cover plate 7, and only the both sides of the small fish area assembly test piece can move along the axial direction of the small fish area assembly test piece; the actuator cylinder part is fixed by the actuator connecting piece 9, the gantry 10 and the fixed yoke 11, only the loading yoke 1 connected with the actuator telescopic rod can move along the vertical direction, 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, so that the vertical direction loading of the small fish area assembly test piece is realized.

[0036] The small fish area assembly fatigue test loading device provided by the application solves the special constraint problem that the both sides of the small fish area assembly release the axial displacement and constrain the displacement in other directions, avoids the offset of the loading direction caused by the gravity center offset of the small fish area assembly test piece due to the additional devices such as the actuator servo valve and the oil pipe, and can effectively examine the fatigue characteristics of the small fish area assembly.

Claims

1. A loading device for fatigue testing of a small fish area assembly, characterized in that It comprises loading fork (1), loading upper joint (2), loading lower joint (3), sliding fork (4), bearing seat (5), bearing connecting piece (6), cover plate (7), bottom plate (8), actuator connecting piece (9), gantry (10) and fixed fork (11), wherein: The rod end of the loading fork (1) is connected with the sensor and the actuator through threads, and the fork end of the loading fork (1) is connected with the loading upper joint (2) through bolts, the loading upper joint (2) and the loading lower joint (3) are internally provided with grooves, and the loading upper joint (2), the loading lower joint (3) and the small fish area assembly test piece are fixed together through bolts, so as to ensure that the loading upper joint (2) and the loading lower joint (3) are attached to the small fish area assembly test piece. The fork end of the sliding fork (4) is connected with the small fish area assembly test piece through bolts, the rod end of the sliding fork (4) passes through the linear bearing built in the middle of the hole of the bearing connecting piece (6), the cover plate (7) is fixed on the bearing connecting piece (6) through bolts, which effectively prevents the built-in linear bearing from loosening; the deep groove ball bearing is built in the middle of the hole of the bearing seat (5), the rod pieces on both sides of the bearing connecting piece (6) pass through the deep groove ball bearing of the bearing seat (5), the rod end of the bearing connecting piece (6) is fixed through bolts, and the bottom of the bearing seat (5) is fixed on the bottom plate (8) through bolts; the sliding fork (4), the bearing seat (5), the bearing connecting piece (6) and the cover plate (7) at both ends of the gantry (10) are consistent, which releases the axial displacement of the both ends of the small fish area assembly and restricts the displacement in other directions. The actuator connecting piece (9) is internally provided with a linear bearing, the middle part of the square steel at the top of the gantry (10) is holed, the rod end of the fixed fork (11) passes through the hole of the square steel at the top of the gantry (10) and is fixed together in the form of bolt connection, and the fork end of the fixed fork (11) is connected with the actuator in the form of bolt connection; the actuator connecting piece (9) is fixed on the gantry (10) through bolts.

2. The apparatus of claim 1, wherein, The groove width of the recesses internally provided in the loading upper joint (2) and the loading lower joint (3) is consistent with the width of the small fish area assembly test piece, and the groove depth is half of the thickness of the small fish area assembly test piece.

3. The apparatus of claim 1, wherein, Felt is pasted on the surface of the contact part of the loading upper joint (2) and the loading lower joint (3) with the small fish area assembly test piece to prevent damage to the small fish area assembly test piece.

4. The apparatus of claim 1, wherein, The middle hole of the bearing connecting piece (6) contains two hole diameters, the hole diameter close to the small fish area assembly test piece is 2·r1, r1 is half of the diameter of the rod end of the sliding fork (4), and the remaining hole diameter is 2·R1, R1 is half of the outer diameter of the built-in linear bearing.

5. The apparatus of claim 1, wherein, The middle hole of the actuator connecting piece (9) contains two hole diameters, the hole diameter close to the sensor is 2·r2, r2 is half of the diameter of the telescopic rod of the actuator, and the remaining hole diameter is 2·R2, R2 is half of the outer diameter of the built-in linear bearing.

6. The apparatus of claim 1, wherein, The outside of the actuator connecting piece (9) is fixed through a shaft elastic retainer, which effectively prevents the linear bearing from loosening.

7. The apparatus of claim 1, wherein, The gantry (10) is welded by square steel and A3 steel connecting plates.

8. The apparatus of claim 1, wherein, The actuator telescopic rod prevents the actuator from being deviated in the loading direction due to the deviation of the actuator gravity center caused by the actuator connecting servo valve and oil pipe equipment through the linear bearing built in the actuator connecting piece (9), and ensures the vertical direction loading of the small fish area assembly test piece.

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