High-precision fatigue test tooling

Abstract

A high-precision fatigue test tooling, comprising a single-ear member, a double-ear member, a distance adjustment block, a fixing block and a bolt fastening assembly. The single-ear member is provided with a first shaft hole; the double-ear member is inserted into the single-ear member and is provided with a second shaft hole that can be coaxial with the first shaft hole; the distance adjustment block is detachably connected to the double-ear member. The distance adjustment block is provided with a third shaft hole, a limiting groove and a distance adjustment groove. The limiting groove and the distance adjustment groove respectively communicate with the third shaft hole and are respectively located at both ends of the third shaft hole; the distance adjustment groove faces the double-ear member; the fixing block is detachably covered at the limiting groove of the distance adjustment block, and a through hole corresponding to the third shaft hole is provided on the fixing block; the bolt fastening assembly is used to detachably connect the distance adjustment block, the fixing block and the double-ear member together. The present invention uses the distance adjustment block to fit different working conditions of the locking pin during actual use. In different usage situations, distance adjustment blocks of different sizes can be selected for testing, so it can greatly improve the accuracy of fatigue tests.

Description

Technical Field

[0001] The present invention relates to a test tooling, and particularly to a high-precision fatigue test tooling.

Background Art

[0002] With the continuous development of aviation technology, the requirements for aviation structural components are getting higher and higher. The tail boom folding and locking device has the characteristics of light weight, small volume, convenient operation, simple maintenance, long service life, etc., and is widely used in helicopters. Before the tail boom folding and locking device is delivered for use, it needs to undergo factory inspection, and only the qualified products can be put into use. It is necessary to detect whether the fatigue strength of the upper and lower locking pins of the tail boom folding and locking device meets the design requirements. Due to the volume limitation of the tail boom folding and locking device, the product cannot be installed on the fatigue testing machine as a whole, and only the locking pins of the tail boom folding and locking device can be tested for fatigue individually. If only the upper and lower locking pins are tested without restricting their working conditions, the actual use situation cannot be simulated, and the test accuracy requirements cannot be met. Therefore, there is an urgent need for a new type of fatigue test tooling that can simulate the actual working conditions of the locking pins to meet the accuracy requirements of fatigue tests.

Summary of the Invention

[0003] The present invention aims to solve the above problems and provides a high-precision fatigue test tooling that can solve the fatigue test problems of the locking pins of the tail boom folding and locking device.

[0004] To solve the above problems, the present invention provides a high-precision fatigue test tooling, which is characterized in that it includes a single-ear member, a double-ear member, a distance adjustment block, a fixed block, and a bolt fastening assembly. The single-ear member is provided with a first shaft hole; the double-ear member is inserted into the single-ear member and is provided with a second shaft hole that can be coaxial with the first shaft hole; the distance adjustment block is detachably connected to the double-ear member, and the distance adjustment block is provided with a third shaft hole, a limiting groove, and a distance adjustment groove. The limiting groove and the distance adjustment groove communicate with the third shaft hole respectively and are located at both ends of the third shaft hole; the distance adjustment groove faces the double-ear member; the fixed block is detachably covered at the limiting groove of the distance adjustment block, and a through hole corresponding to the third shaft hole is provided on the fixed block; the bolt fastening assembly is used to detachably connect the distance adjustment block, the fixed block, and the double-ear member together.

[0005] Further, the distance adjustment block is in a block shape, the distance adjustment groove is a straight through groove, which is recessed on one side surface of the distance adjustment block and penetrates both ends of the distance adjustment block; the limiting groove is an annular groove, which is recessed on the side surface of the distance adjustment block opposite to the distance adjustment groove; the limiting groove and the third shaft hole form a stepped hole.

[0006] Further, the through hole is a U-shaped hole.

[0007] Furthermore, the double-ear part includes a second threaded connection portion and a double-ear portion, the second threaded connection portion is integrally formed or integrally connected with the double-ear portion, the double-ear portion is arranged on the end of the second threaded connection portion, the double-ear portions are parallel and spaced to form an insertion space, and the second axial holes are respectively provided on the double-ear portions.

[0008] Furthermore, the single-ear part includes a first threaded connection portion and a single ear portion, the first threaded connection portion is integrally formed or integrally connected with the single ear portion, the single ear portion is arranged on the end of the first threaded connection portion, the single ear portion can be inserted into the insertion space between the two ear portions, and the first axial hole is provided on the single ear portion.

[0009] Furthermore, the first axial hole and the second axial hole are perpendicular to the first threaded connection portion and the second threaded connection portion.

[0010] Further, when the first axial hole and the second axial hole are coaxial, the first threaded connection portion and the second threaded connection portion are in a coaxial state.

[0011] Furthermore, a plurality of internal threaded holes are provided on the two ear portions facing the distance adjustment block, a plurality of first bolt mounting holes corresponding to the internal threaded holes are provided on the distance adjustment block, and a plurality of second bolt mounting holes corresponding to the first bolt mounting holes are provided on the fixed block; the bolt fastening assembly comprises a bolt and a gasket and a self-locking nut connected to the end of the bolt; the bolt passes through the second bolt mounting hole and the first bolt mounting hole in sequence and is threadedly connected to the internal threaded hole; the gasket and the self-locking nut are respectively connected to the end or proximal end of the bolt facing the fixed block, so that the fixed block, the distance adjustment block and the two ear portions can be fastened together.

[0012] Furthermore, the internal threaded holes are distributed around the second shaft hole, the first bolt mounting holes are distributed around the limiting groove, and the second bolt mounting holes are distributed around the through hole.

[0013] The beneficial contribution of the present invention is that it effectively solves the above-mentioned problems. The high-precision fatigue test fixture of the present invention has a simple structure and is easy to install. It is not only convenient for fatigue testing of the lock pin of the tail beam folding locking device, but also can simulate actual use conditions to conduct tests to improve test accuracy. The present invention uses a distance adjustment block to match the different working conditions of the lock pin during actual use. Under different working conditions, distance adjustment blocks of different sizes can be selected for testing, thereby greatly improving the accuracy of fatigue testing. The present invention has the characteristics of simple structure, practical functions, and easy use. It has strong practicality and should be vigorously promoted.

Brief Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0015] Figure 2 It is a schematic diagram of the structural decomposition of the present invention.

[0016] Figure 3 It is a cross-sectional view of the structure of the present invention.

[0017] Among them, single-ear part 10, first threaded connection part 11, single-ear part 12, first shaft hole 13, double-ear part 20, second threaded connection part 21, double-ear part 22, first ear part 221, second ear part 222, insertion space 223, second shaft hole 23, internal threaded hole 24, distance adjustment block 30, third shaft hole 31, distance adjustment groove 32, limit groove 33, first bolt mounting hole 34, fixed block 40, through hole 41, second bolt mounting hole 42, bolt fastening assembly 50, bolt 51, gasket 52, self-locking nut 53, locking pin 60, convex edge 61.

Detailed Implementation Modes

[0018] The following embodiments are further explanations and supplements to the present invention and do not constitute any limitation to the present invention.

[0019] As Figures 1 to 3 shown, the high-precision fatigue test tooling of the present invention includes a single-ear part 10, a double-ear part 20, a distance adjustment block 30, a fixed block 40, and a bolt fastening assembly 50. The single-ear part 10 and the double-ear part 20 are inserted, and they are respectively provided with a first shaft hole 13 and a second shaft hole 23 that can coaxially insert a locking pin 60. The single-ear part 10 and the double-ear part 20 are rotationally connected through the locking pin 60, which is used to simulate two parts connected by the locking pin 60 during actual use to simulate actual applications; the distance adjustment block 30 is used to adapt to the actual use conditions of the part to be tested, and it is a replaceable accessory that can be selected with different sizes to meet the test requirements of different parts; the fixed block 40 is used to cooperate with the distance adjustment block 30 to limit the part to be tested to prevent axial movement and detachment of the part to be tested.

[0020] Specifically, as Figures 1 to 3As shown, the double-ear part 20 includes a second threaded connection part 21 and double-ear parts 22. The second threaded connection part 21 and the double-ear parts 22 are integrally formed or integrally connected. In this embodiment, the second threaded connection part 21 and the double-ear parts 22 are integrally formed. An external thread is provided on the second threaded connection part 21, which is used for threaded connection with an existing fatigue testing machine to install the double-ear part 20 onto the existing fatigue testing machine. The double-ear parts 22 are formed on the end surface of the second threaded connection part 21 and extend along the axial direction of the second threaded connection part 21. The double-ear parts 22 include a first ear part 221 and a second ear part 222. The first ear part 221 and the second ear part 222 are parallel and spaced apart, and an insertion space 223 for inserting the single-ear part 10 is formed therebetween. The distance between the first ear part 221 and the second ear part 222 can be set as required. In this embodiment, the first ear part 221 and the second ear part 222 are in a flat plate shape, parallel to the axial direction of the second threaded connection part 21; and the first ear part 221 and the second ear part 222 are evenly offset on both sides of the axis of the second threaded connection part 21. Second shaft holes 23 are respectively provided on the double-ear parts 22, that is, the first ear part 221 and the second ear part 222. The second shaft holes 23 are used for inserting the part to be tested, that is, the lock pin 60. The second shaft holes 23 are perpendicular to the axial direction of the second threaded connection part 21. The size of the second shaft holes 23 can be set according to the size of the part to be tested. The position of the second shaft holes 23 can be set as required. In this embodiment, the second shaft holes 23 are provided at the central positions of the first ear part 221 and the second ear part 222.

[0021] As Figures 1 to 3 As shown, the single-ear part 10 includes a first threaded connection part 11 and a single-ear part 12. The first threaded connection part 11 and the single-ear part 12 are integrally formed or integrally connected. In this embodiment, the first threaded connection part 11 and the single-ear part 12 are integrally formed. An external thread is provided on the first threaded connection part 11, which is used for threaded connection with an existing fatigue testing machine to install the single-ear part 10 onto the existing fatigue testing machine. The single-ear part 12 is formed on the end surface of the first threaded connection part 11 and extends along the axial direction of the first threaded connection part 11. The single-ear part 12 is centered on the end surface of the first threaded connection part 11. The thickness of the single-ear part 12 should not be greater than the distance between the double-ear parts 22, that is, the first ear part 221 and the second ear part 222. A first shaft hole 13 is provided on the single-ear part 12. The first shaft hole 13 is used for inserting the part to be tested, that is, the lock pin 60. The first shaft hole 13 is perpendicular to the axial direction of the first threaded connection part 11. The size of the first shaft hole 13 can be set according to the size of the part to be tested. In this embodiment, the size of the first shaft hole 13 is the same as the size of the second shaft hole 23.

[0022] As Figures 1 to 3 shown, when the single ear part 12 of the single ear part 10 is inserted into the insertion space 223 of the double ear part 20, the first shaft hole 13 can be aligned with the second shaft hole 23, and the first threaded connection part 11 and the second threaded connection part 21 are in a coaxial state, so that the part to be tested, the locking pin 60, can be inserted into the first shaft hole 13 and the second shaft hole 23 for fatigue testing.

[0023] As Figures 1 to 3 shown, in order to adapt to the working condition test requirements under different usage conditions, a detachable distance adjustment block 30 is provided on the double ear part 20.

[0024] As Figures 1 to 3 shown, the distance adjustment block 30 is in a block shape, and its specific shape is not limited. A third shaft hole 31 is provided on the distance adjustment block 30; the third shaft hole 31 is used to insert the part to be tested, the locking pin 60. The size of the third shaft hole 31 can be set according to the size of the part to be tested. In this embodiment, the size of the third shaft hole 31 is the same as the size of the second shaft hole 23.

[0025] During the actual use of the locking pin 60 of the tail beam folding locking device, when it extends to the maximum length, its convex edge 61 will fit with the washer, and the washer will be spaced from the part to be connected. Therefore, to simulate this actual working condition, as Figures 1 to 3 shown, a distance adjustment groove 32 is provided on one side surface of the distance adjustment block 30. The distance adjustment groove 32 is recessed on one side surface of the distance adjustment block 30. It is a straight through groove that penetrates both ends of the distance adjustment block 30 and communicates with the third shaft hole 31. The third shaft hole 31 is located in the center of the distance adjustment groove 32. The depth of the distance adjustment groove 32 is set according to the distance between the washer and the part to be connected; the thickness of the distance adjustment block 30 is set according to the actual distance between the convex edge 61 and the part to be connected at the most extreme position. For different models of tail beam folding locking devices, the thickness of the distance adjustment block 30 and the depth of the distance adjustment groove 32 may be different, and they are set according to the corresponding model of the locking pin 60. When testing different models of locking pins 60, a distance adjustment block 30 with a corresponding size needs to be selected for installation.

[0026] As Figures 1 to 3 shown, in order to limit the axial movement of the part to be tested, the locking pin 60, along the first shaft hole 13 and the second shaft hole 23 for convenient testing, a limiting groove 33 is provided on the side of the distance adjustment block 30 opposite to the distance adjustment groove 32, and a coverable fixing block 40 is provided at the limiting groove 33.

[0027] As Figures 1 to 3As shown, the limiting groove 33 is an annular groove, which is recessed on the surface of the distance adjusting block 30 opposite to the distance adjusting groove 32 and communicates with the third shaft hole 31. In other words, the limiting groove 33 and the distance adjusting groove 32 are respectively located on the opposite side surfaces of the distance adjusting block 30 and both communicate with the third shaft hole 31. The limiting groove 33 and the third shaft hole 31 form a stepped hole, which can limit the axial movement of the locking pin 60 along the direction of the double-ear member 20. The depth of the limiting groove 33 is consistent with the thickness of the convex edge 61 of the locking pin 60; when the locking pin 60 is inserted into the third shaft hole 31, the convex edge 61 of the locking pin 60 is embedded in the limiting groove 33, and the surface of the convex edge 61 is flush with the surface of the distance adjusting block 30.

[0028] As Figures 1 to 3 shown, the fixing block 40 is used to cover the limiting groove 33 to limit the axial movement of the locking pin 60. The fixing block 40 is plate-shaped and its specific shape is not limited. The outer dimension of the fixing block 40 should be larger than the dimension of the limiting groove 33, so that it can cover the surface of the distance adjusting block 30 to limit the convex edge 61 in the limiting groove 33 and prevent it from moving. A through hole 41 for passing the locking pin 60 is provided on the fixing block 40, and the size of the through hole 41 should be such that the locking pin 60 can pass through it easily, but the convex edge 61 of the locking pin 60 cannot pass through it. In this embodiment, the through hole 41 is a U-shaped hole, which is conducive to alignment and installation.

[0029] As Figures 1 to 3 shown, for facilitating the disassembly and assembly for fatigue tests of different parts to be tested, the distance adjusting block 30 and the fixing block 40 are detachably assembled on the second ear part 222 of the double-ear member 20 through a bolt fastening assembly 50. The bolt fastening assembly 50 includes a bolt 51, a gasket 52 and a self-locking nut 53. The bolt 51 is a headless bolt and is provided with an external thread. The washer 52 can be sleeved on the bolt 51, and the self-locking nut 53 can be threadedly connected to the bolt 51.

[0030] As Figures 1 to 3 shown, for facilitating disassembly and installation, a plurality of internal threaded holes 24 are provided on the double-ear part 22 for threadedly connecting the bolt 51. A plurality of first bolt mounting holes 34 are provided on the distance adjusting block 30, and a plurality of second bolt mounting holes 42 are provided on the fixing block 40. The first bolt mounting holes 34 and the second bolt mounting holes 42 are through holes without threads. The internal threaded holes 24 are distributed around the second shaft hole 23, the first bolt mounting holes 34 are distributed around the third shaft hole 31, and the second bolt mounting holes 42 are distributed around the through hole 41. In this embodiment, the first bolt mounting holes 34 are provided on the second ear part 222 and are parallel to the second shaft hole 23.

[0031] AsFigures 1 to 3 As shown, during assembly, the bolt 51 can sequentially pass through the second bolt mounting hole 42 and the first bolt mounting hole 34 and be threadedly connected to the internal thread hole 24. Thereafter, the gasket 52 and the self-locking nut 53 are respectively connected to the end of the bolt 51, and then the distance adjusting block 30 and the fixing block 40 can be detachably assembled on the second ear 222 of the double-ear part 20, so that the second shaft hole 23 and the third shaft hole 31 are coaxial.

[0032] Thereby, the high-precision fatigue test tooling of the present invention is formed. During use, the single-ear part 10 and the double-ear part 20 are respectively installed on the fatigue testing machine to ensure that the first shaft hole 13 and the second shaft hole 23 are aligned; thereafter, the distance adjusting block 30 is sleeved on the pin 60 to be tested, and then the pin 60 is inserted into the first shaft hole 13 and the second shaft hole 23, so that the distance adjusting groove 32 of the distance adjusting block 30 faces the double-ear part 20, and the convex edge 61 of the pin 60 is embedded in the limit groove 33 of the distance adjusting block 30; subsequently, the convex edge 61 of the pin 60 is clamped by the fixing block 40, the bolt fastening assembly 50 is installed, and the fixing block 40, the distance adjusting block 30 and the double-ear part 20 are fastened together to ensure that the pin 60 cannot move axially. After the installation is completed, the fatigue testing machine can be started for fatigue testing; when the test is completed, the bolt fastening assembly 50 is loosened, and then the pin 60, the fixing block 40 and the distance adjusting block 30 can be removed, and then a suitable distance adjusting block 30 is selected for the test of the next part to be tested.

[0033] The high-precision fatigue test tooling of the present invention has a simple structure and is easy to install. It is easy to position and install the pin 60 of the tail beam folding locking device, thus facilitating fatigue testing. The present invention can use the distance adjusting block 30 to fit different working conditions of the pin 60 during actual use. For different working conditions in different use cases, distance adjusting blocks 30 of different sizes can be selected for testing, so it can greatly improve the accuracy of fatigue testing.

[0034] Although the present invention is disclosed through the above embodiments, the scope of the present invention is not limited thereto. Without departing from the concept of the present invention, the above components can be replaced by similar or equivalent components known to those skilled in the art.

Claims

1. A high-precision fatigue test tooling, characterized in that It includes: A single ear piece (10) is provided with a first axial hole (13); A double-ear piece (20) is inserted into the single-ear piece (10) and is provided with a second axial hole (23) coaxial with the first axial hole (13); A distance adjustment block (30) is detachably connected to the double-ear piece (20); the distance adjustment block (30) is provided with a third axial hole (31), a limiting groove (33) and a distance adjustment groove (32); the limiting groove (33) and the distance adjustment groove (32) are respectively connected to the third axial hole (31) and are respectively located at two ends of the third axial hole (31); the distance adjustment groove (32) faces the double-ear piece (20); A fixed block (40) is detachably covered on the limiting groove (33) of the distance adjustment block (30), and a through hole (41) corresponding to the third shaft hole (31) is provided on the fixed block (40); A bolt fastening assembly (50) is used to detachably connect the distance adjustment block (30), the fixing block (40) and the double-ear member (20); The distance adjustment block (30) is used to simulate the following working conditions: During actual use, when the locking pin (60) is extended to its maximum length, its convex edge (61) will fit with the washer, and the washer will be spaced apart from the part to be connected; The depth of the distance adjustment groove (32) is set according to the distance between the gasket and the part to be connected; the thickness of the distance adjustment block (30) is set according to the actual distance between the convex edge (61) on the test piece and the part to be connected when the convex edge (61) is at the most extreme position; When in use, the distance adjustment block (30) is used to match different working conditions of the lock pin during actual use. In different working conditions under different use situations, distance adjustment blocks (30) of different sizes are selected for testing.

2. The high-precision fatigue test tooling according to claim 1, wherein, The distance adjustment block (30) is block-shaped; the distance adjustment groove (32) is a straight through groove, which is recessed on one side surface of the distance adjustment block (30) and passes through two ends of the distance adjustment block (30); the limiting groove (33) is an annular groove, which is recessed on one side surface of the distance adjustment block (30) opposite to the distance adjustment groove (32); the limiting groove (33) and the third shaft hole (31) form a stepped hole.

3. The high-precision fatigue test tooling according to claim 2, wherein The through hole (41) is a U-shaped hole.

4. The high-precision fatigue test tooling according to claim 1, wherein The double-ear member (20) comprises a second threaded connection portion (21) and a double-ear portion (22); the second threaded connection portion (21) and the double-ear portion (22) are integrally formed or integrally connected; the double-ear portion (22) is arranged on the end of the second threaded connection portion (21); the double-ear portions (22) are parallel and spaced apart to form an insertion space (223); and the second axial holes (23) are respectively arranged on the double-ear portions (22).

5. The high-precision fatigue test tooling according to claim 4, wherein, The single ear part (10) includes a first threaded connection part (11) and a single ear part (12). The first threaded connection part (11) is integrally formed or integrally connected with the single ear part (12). The single ear part (12) is provided at the end of the first threaded connection part (11). The single ear part (12) can be inserted into the insertion space (223) between the double ear parts (22). A first shaft hole (13) is provided on the single ear part (12).

6. The high-precision fatigue test tooling according to claim 5, characterized in that, The first shaft hole (13) and the second shaft hole (23) are perpendicular to the first threaded connection part (11) and the second threaded connection part (21).

7. The high-precision fatigue test tooling according to claim 6, wherein When the first shaft hole (13) and the second shaft hole (23) are coaxial, the first threaded connection part (11) and the second threaded connection part (21) are in a coaxial state.

8. The high-precision fatigue test tooling according to claim 4, characterized in that, A plurality of internal threaded holes (24) are provided on the double ear part (22) facing the distance adjustment block (30). A plurality of first bolt mounting holes (34) corresponding to the internal threaded holes (24) are provided on the distance adjustment block (30). A plurality of second bolt mounting holes (42) corresponding to the first bolt mounting holes (34) are provided on the fixed block (40). The bolt fastening assembly (50) includes a bolt (51), a gasket (52) and a self-locking nut (53) connected to the end of the bolt (51). The bolt (51) sequentially passes through the second bolt mounting hole (42) and the first bolt mounting hole (34) and is threadedly connected to the internal threaded hole (24). The gasket (52) and the self-locking nut (53) are respectively connected to the end or near-end of the bolt (51) facing the fixed block (40) to tightly connect the fixed block (40), the distance adjustment block (30) and the double ear part (22) together.

9. The high-precision fatigue test tooling according to claim 8, wherein The internal threaded holes (24) are distributed around the second shaft hole (23). The first bolt mounting holes (34) are distributed around the limit groove (33). The second bolt mounting holes (42) are distributed around the through hole (41).

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