A multi-curved tenon restraint fixture

Abstract

The application belongs to the technical field of aircraft structure strength test, and relates to a multi-curved tenon constraint clamp. The clamp comprises a radial stop clamp (3) provided with a stop groove, a radial pressing block (2) arranged in the stop groove, and a support base (8) used for connecting a vibration table. The radial pressing block (2) is used for pressing the tenon of a blade test piece (1) located at the slot opening of the stop groove. The support base (8) is provided with a square hole with a stop flange at the front end. The combination of the radial stop clamp (3) and the blade test piece (1) is pressed on the stop flange at the front end of the square hole through a wedge-shaped pressing block (5) in the square hole. The application can realize all-around constraint of the multi-curved tenon and improve the control precision of the vibration test.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of aircraft structure strength test, and particularly relates to a multi-curved tenon constraint clamp. BACKGROUND

[0002] When a multi-curved tenon blade is subjected to vibration test, the tenon needs to be clamped and constrained. The test piece is formed by cutting and intercepting from a blade disc structure, and the two planes of the tenon part available for clamping and constraining have the feature that the distance between the top end is large and the distance between the bottom end is small. It is difficult to apply effective constraint by using the conventional pressing method. SUMMARY

[0003] In order to solve at least one of the above technical problems, the application provides a multi-curved tenon constraint clamp to solve the vibration fatigue test requirement of the special tenon blade test piece.

[0004] The multi-curved tenon constraint clamp provided by the application mainly comprises:

[0005] A radial stop clamp, the radial stop clamp has a stop groove, a radial pressing block is arranged in the stop groove, and the radial pressing block is used to press the tenon of the blade test piece located in the slot of the stop groove;

[0006] A support base is used to connect a vibration table, the support base has a square hole, the front end of the square hole has a stop flange, and the combination of the radial stop clamp and the blade test piece is pressed on the stop flange at the front end of the square hole by a wedge-shaped pressing block in the square hole.

[0007] Preferably, a plurality of mounting holes are arranged on the support base to be connected with the vibration table by bolts.

[0008] Preferably, a threaded hole is arranged on the radial stop clamp from the side away from the slot of the stop groove to the stop groove, and a radial pressing bolt passes through the threaded hole to press the radial pressing block in the stop groove.

[0009] Preferably, the radial pressing bolt of the radial stop clamp extends from the rear end of the square hole of the support base.

[0010] Preferably, the radial pressing block has a containing groove matched with the bottom end structure of the tenon of the blade test piece, the slot of the stop groove is arranged as a contraction slot, and the transition surface between the contraction slot and the stop groove is matched with the intermediate recessed structure profile of the tenon of the blade test piece.

[0011] Preferably, the stop flange has a first threaded hole and a second threaded hole through the square hole from the outer end face, a main clamping bolt is threadedly connected in the first threaded hole, a clamping block radial constraint bolt is threadedly connected in the second threaded hole, the main clamping bolt is used to clamp the wedge-shaped clamping block in the square hole along the direction perpendicular to the installation direction of the blade test piece, the wedge-shaped clamping block is used to press the blade test piece forward to the stop flange on the front side of the square hole along the blade test piece tenon slope, and the clamping block radial constraint bolt is used to extend into the square hole at the rear end of the square hole along the direction parallel to the installation direction of the blade test piece and clamp on the wedge-shaped clamping block.

[0012] The application can realize all-around constraint of the multi-curved tenon and improve the control accuracy of vibration test. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 FIG. 1 is a schematic diagram of a radial stop clamp structure of a multi-curved tenon constraint clamp according to the application.

[0014] Figure 2 FIG. 2 is a schematic diagram of a structure in which the radial stop clamp of the embodiment shown in FIG. 1 is installed on a support base. Figure 1

[0015] In the figure, 1 represents a blade test piece, 2 represents a radial clamping block, 3 represents a radial stop clamp, 4 represents a radial clamping bolt, 5 represents a wedge-shaped clamping block, 6 represents a clamping block radial constraint bolt, 7 represents a main clamping bolt, and 8 represents a support base. DETAILED DESCRIPTION

[0016] To make the purpose, technical scheme and advantages of the application clearer, the technical scheme of the embodiment of the application will be described in more detail below in combination with the drawings in the embodiment of the application. In the drawings, the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The described embodiment is part of the embodiment of the application, not all of the embodiment of the application. The embodiment described below by reference to the drawings is exemplary and is intended to explain the application, and cannot be understood as a limitation on the application. Based on the embodiment in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the application. The embodiment of the application will be described in detail below in combination with the drawings.

[0017] The application provides a multi-curved tenon constraint clamp, as shown in Figure 1 and Figure 2 The application provides a multi-curved tenon constraint clamp, as shown in

[0018] The radial stop clamp 3 has a stop groove, and a radial clamping block 2 is arranged in the stop groove, which is used to clamp the tenon of the blade test piece 1 located in the slot of the stop groove.​

[0019] Support base 8 for connecting the vibration table, the support base 8 has a square hole, the square hole has a stop flange at the front end, and the combination of the radial stop clamp 3 and the blade test piece 1 is clamped in the square hole by the wedge-shaped clamping block 5 and is clamped on the stop flange at the front end of the square hole.

[0020] The radial stop clamp 3 is used to clamp the blade in the radial direction, that is, the blade test piece 1 is clamped and limited in the installation direction from the blade tip to the tenon, and then the wedge-shaped clamping block 5 of the support base 8 is used to clamp the blade test piece 1 in the vertical and radial directions, so that the clamping effect is guaranteed.

[0021] In some optional embodiments, a plurality of mounting holes are provided on the support base 8 to be connected to the vibration table by bolts.

[0022] Reference Figure 2 In this embodiment, the support base 8 has a disc mounting seat, which is provided with a plurality of through holes for matching connection with the electric vibration test table, and is placed on the vibration table to provide vibration load for the clamp and test piece combination.

[0023] In some optional embodiments, a threaded hole is provided on the radial stop clamp 3 from the side away from the stop groove slot to the stop groove, and the radial clamping bolt 4 passes through the threaded hole to clamp the radial clamping block 2 in the stop groove.

[0024] Reference Figure 1 In this embodiment, the radial clamping bolt 4 is rotated to push the radial clamping block 2 to move forward to clamp the blade test piece 1 at the stop groove slot.

[0025] In some optional embodiments, the radial clamping bolt 4 of the radial stop clamp 3 extends from the rear end of the square hole of the support base 8.

[0026] In this embodiment, the radial clamping bolt 4 is arranged in an operable area, so that after excitation is applied by the vibration table, the tightening torque of the radial clamping bolt 4 is gradually adjusted, so that the change of the inherent frequency of the blade test piece 1 and the clamp combination meets the requirements.

[0027] In some optional embodiments, the radial clamping block 2 has a receiving groove adapted to the bottom structure of the tenon of the blade test piece 1, and the stop groove slot is provided as a contraction opening, and the transition surface between the contraction opening and the stop groove is adapted to the middle recess structure profile of the tenon of the blade test piece 1.

[0028] In some alternative embodiments, the stop flange 9 has a first threaded hole and a second threaded hole through the square hole from the outer end surface, the first threaded hole is adapted to screw connect the main clamping bolt 7, and the second threaded hole is adapted to screw connect the clamping block radial constraint bolt 6, the main clamping bolt 7 is used to clamp the wedge-shaped clamping block 5 in the square hole along the direction perpendicular to the installation direction of the blade test piece 1, and the wedge-shaped clamping block 5 is used to press the blade test piece 1 forward to the stop flange on the front side of the square hole along the tenon inclined surface of the blade test piece 1, and the clamping block radial constraint bolt 6 is used to extend into the square hole at the rear end of the square hole along the direction parallel to the installation direction of the blade test piece 1 and clamp on the wedge-shaped clamping block 5.

[0029] In this embodiment, first refer to Figure 1 The tenon of the blade test piece 1 has an inclined surface, as shown in Figure 2 The wedge-shaped clamping block 5 has a tapered inclined surface, which cooperates with the tenon inclined surface of the blade test piece 1 to push the blade test piece 1 to move to the right until the tenon of the blade test piece 1 is clamped on the stop flange at the front end of the square hole of the support base 8, at this time, the clamping block radial constraint bolt 6 is further pushed from the left side to prevent the wedge-shaped clamping block 5 from moving to the left along the tenon inclined surface of the blade test piece 1.

[0030] In this embodiment, after the excitation is applied by the vibration table, it is also necessary to gradually adjust the tightening torque of the clamping block radial constraint bolt 6 and the main clamping bolt 7.

[0031] The wedge-shaped clamping block, the main clamping bolt and the clamping block radial constraint bolt are used to completely constrain the blade test piece, so that the vibration test can be carried out on the multi-curved tenon type blade test piece.

[0032] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A multi-curved tenon restraint fixture, comprising: The utility model relates to a radial stop clamp (3) with a stop groove, a radial pressing block (2) is arranged in the stop groove, the radial pressing block (2) is used for pressing the tenon of the blade test piece (1) in the stop groove gap; A support base (8) is used for connecting the vibration table, the support base (8) has a square hole, the square hole has a stop flange at the front end, the combination of the radial stop clamp (3) and the blade test piece (1) is pressed on the stop flange at the front end of the square hole by the wedge pressing block (5) in the square hole; The radial pressing block (2) has a containing groove matched with the bottom end structure of the tenon of the blade test piece (1), the stop groove gap is set as a contraction gap, and the transition surface between the contraction gap and the stop groove is matched with the middle recess structure profile of the tenon of the blade test piece (1); The stop flange (9) has a first threaded hole and a second threaded hole penetrating through the square hole from the outer end face, the first threaded hole is matched with a threaded connection main pressing bolt (7), the second threaded hole is matched with a threaded connection pressing block radial constraint bolt (6), the main pressing bolt (7) is used for pressing the wedge pressing block (5) in the square hole along the direction perpendicular to the installation direction of the blade test piece (1), the wedge pressing block (5) is used for pressing the blade test piece (1) forward to the stop flange on the front side of the square hole along the inclined surface of the tenon of the blade test piece (1), and the pressing block radial constraint bolt (6) is used for extending into the square hole at the rear end of the square hole along the direction parallel to the installation direction of the blade test piece (1) and is pressed on the wedge pressing block (5). A plurality of mounting holes are arranged on the support base (8) to be connected with the vibration table through bolts.

2. The multi-curved tenon restraining jig of claim 1, wherein, A threaded hole penetrating through the stop groove from the side away from the stop groove gap is arranged on the radial stop clamp (3), and the radial pressing bolt (4) is pressed on the radial pressing block (2) in the stop groove after penetrating through the threaded hole.

3. The multi-curved tenon restraining jig of claim 1, wherein, The radial pressing bolt (4) of the radial stop clamp (3) extends from the rear end of the square hole of the support base (8).

4. The multi-curved tenon restraining jig of claim 3, wherein, ​

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