Multi-curved-surface tenon restraining clamp

Abstract

The invention belongs to the technical field of airplane structure strength tests, and relates to a multi-curved-surface tenon restraining clamp. The fixture comprises a radial locking fixture (3), the radial locking fixture (3) is provided with a locking groove, a radial jacking block (2) is arranged in the locking groove, and the radial jacking block (2) is used for jacking a tenon of a blade test piece (1) located at a notch of the locking groove; the supporting base (8) is used for being connected with a vibration table, the supporting base (8) is provided with a square hole, the front end of the square hole is provided with a stop flange, and a combined body of the radial stop clamp (3) and the blade test piece (1) is tightly propped against the stop flange at the front end of the square hole through a wedge-shaped propping block (5) in the square hole. According to the invention, the multi-curved-surface tenon can be subjected to omnibearing constraint, and the control precision of the vibration test can be improved.

Description

Technical Field

[0001] The present application belongs to the technical field of aircraft structure strength testing, and in particular relates to a multi-curved tenon constraint fixture. Background Art

[0002] When conducting a vibration test on a multi-curved tenon blade, the tenon needs to be clamped and restrained. The test piece is cut from the blade disk structure. The distance between the two planes of the tenon part that can be clamped and restrained is large at the top and small at the bottom. Conventional clamping methods are difficult to apply effective constraints. Summary of the invention

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

[0004] The multi-curved tenon constraint fixture of this application mainly includes:

[0005] A radial stop fixture, wherein the radial stop fixture has a stop groove, a radial tightening block is arranged in the stop groove, and the radial tightening block is used to tighten the tenon of the blade test piece located at the notch of the stop groove;

[0006] The support base is used to connect the vibration table. The support base has a square hole. The front end of the square hole has a stopping flange. The combination of the radial stopping fixture and the blade test piece is tightened on the stopping flange at the front end of the square hole through a wedge-shaped tightening block in the square hole.

[0007] Preferably, the support base is provided with a plurality of mounting holes for being connected to the vibration table by bolts.

[0008] Preferably, the radial stop clamp is provided with a threaded hole extending from a side away from the stop groove notch to the stop groove, and after the radial tightening bolt passes through the threaded hole, it tightens the radial tightening block located in the stop groove.

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

[0010] Preferably, the radial tightening block has a receiving groove adapted to the bottom end structure of the tenon of the blade test piece, the retaining groove notch is arranged as a contraction opening, and the transition surface between the contraction opening and the retaining groove is adapted to the middle concave structural surface of the tenon of the blade test piece.

[0011] Preferably, the stopping flange has a first threaded hole and a second threaded hole which pass through the square hole from the outer end face, the first threaded hole is adapted to be threadedly connected with a main tightening bolt, and the second threaded hole is adapted to be threadedly connected with a tightening block radial restraint bolt, the main tightening bolt is used to tighten the wedge-shaped tightening block in the square hole along a direction perpendicular to the installation direction of the blade test piece, the wedge-shaped tightening block presses the blade test piece forward along the inclined surface of the tenon of the blade test piece onto the stopping flange on the front side of the square hole, and the tightening block radial restraint bolt is used to extend into the square hole at the rear end of the square hole parallel to the installation direction of the blade test piece, and tighten on the wedge-shaped tightening block.

[0012] The present application can perform all-round constraints on multi-curved tenons and can improve the control accuracy of vibration tests. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0015] Among them, 1-blade test piece, 2-radial tightening block, 3-radial stop clamp, 4-radial tightening bolt, 5-wedge-shaped tightening block, 6-tightening block radial restraining bolt, 7-main tightening bolt, 8-support base. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical scheme and advantages of the implementation of this application clearer, the technical scheme in the implementation of this application will be described in more detail in combination with the drawings in the implementation of this application. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described implementation is a part of the implementation of this application, not all of the implementations. The implementation described below with reference to the drawings is exemplary and is intended to be used to explain this application, and cannot be understood as a limitation on this application. Based on the implementation in this application, all other implementations obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The implementation of this application is described in detail below in combination with the drawings.

[0017] The present application provides a multi-curved tenon constraint fixture, such as Figure 1 and Figure 2 As shown, it mainly includes:

[0018] A radial stop fixture 3, wherein the radial stop fixture 3 has a stop groove, in which a radial tightening block 2 is arranged, and the radial tightening block 2 is used to tighten the tenon of the blade test piece 1 located at the notch of the stop groove;

[0019] The support base 8 is used to connect the vibration table. The support base 8 has a square hole with a stop flange at the front end of the square hole. The combination of the radial stop fixture 3 and the blade test piece 1 is tightened on the stop flange at the front end of the square hole through a wedge-shaped tightening block 5 in the square hole.

[0020] The present application performs radial clamping on the blade by means of the radial stop clamp 3, that is, the blade test piece 1 is clamped and limited along the installation direction from the blade tip to the tenon, and then the blade test piece 1 is double clamped vertically and radially based on the wedge-shaped clamping block 5 of the support base 8, thereby ensuring the clamping effect.

[0021] In some optional embodiments, the support base 8 is provided with a plurality of mounting holes for being connected to the vibration table by bolts.

[0022] refer to Figure 2 In this embodiment, the support base 8 has a disc mounting seat, which is provided with a circle of multiple through holes for matching and connecting with the electric vibration test table, and is placed on the vibration table to provide a vibration load to the fixture and test piece assembly.

[0023] In some optional embodiments, the radial stop clamp 3 is provided with a threaded hole extending from the side away from the stop groove to the stop groove. After the radial tightening bolt 4 passes through the threaded hole, it tightens the radial tightening block 2 located in the stop groove.

[0024] refer to Figure 1 In this embodiment, the radial tightening bolt 4 is rotated to push the radial tightening block 2 forward so as to tighten the blade test piece 1 against the notch of the retaining groove.

[0025] In some optional embodiments, the radial tightening bolt 4 of the radial stopping clamp 3 extends out from the rear end of the square hole of the supporting base 8 .

[0026] In this embodiment, the radial tightening bolts 4 are arranged in the operable area so that after the excitation is applied by the vibration table, the tightening torque of the radial tightening bolts 4 is gradually adjusted so that the changes in the natural frequencies of the blade test piece 1 and the fixture assembly obtained meet the requirements.

[0027] In some optional embodiments, the radial tightening block 2 has a receiving groove adapted to the bottom end structure of the tenon of the blade test piece 1, the retaining groove is configured as a contraction opening, and the transition surface between the contraction opening and the retaining groove is adapted to the middle recessed structural surface of the tenon of the blade test piece 1.

[0028] In some optional embodiments, the stop flange 9 has a first threaded hole and a second threaded hole that pass through the square hole from the outer end face, the first threaded hole is adapted to be threadedly connected with a main tightening bolt 7, and the second threaded hole is adapted to be threadedly connected with a tightening block radial constraint bolt 6, the main tightening bolt 7 is used to tighten the wedge-shaped tightening block 5 in the square hole along a direction perpendicular to the installation direction of the blade test piece 1, and the wedge-shaped tightening block 5 squeezes the blade test piece 1 forward along the inclined surface of the tenon of the blade test piece 1 to the stop flange on the front side of the square hole, and the tightening block radial constraint bolt 6 is used to extend into the square hole at the rear end of the square hole along a direction parallel to the installation direction of the blade test piece 1, and tighten on the wedge-shaped tightening block 5.

[0029] In this embodiment, first refer to Figure 1 , the tenon of the blade test piece 1 has an inclined surface, such as Figure 2 As shown, the wedge-shaped clamping block 5 has a conical inclined surface, which cooperates with the inclined surface of the tenon 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 pressed against the stop flange at the front end of the square hole of the supporting base 8. At this time, the clamping block radial restraint bolt 6 is further pushed from the left side to prevent the wedge-shaped clamping block 5 from moving leftward along the inclined surface of the tenon 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 radial restraining bolts 6 of the tightening block and the main tightening bolts 7.

[0031] The present application completely constrains the blade test piece by means of a wedge-shaped clamping block, a main clamping bolt, and a clamping block radial restraining bolt, thereby enabling vibration testing to be performed on multi-curved tenon-type blade test pieces.

[0032] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A multi-curved tenon restraint fixture, characterized in that: include: A radial stop fixture (3), the radial stop fixture (3) having a stop groove, a radial pressing block (2) being arranged in the stop groove, the radial pressing block (2) being used to press against the tenon of the blade test piece (1) located at the notch of the stop groove; The support base (8) is used for connecting to the vibration table. The support base (8) has a square hole. The front end of the square hole has a stop flange. The combination of the radial stop fixture (3) and the blade test piece (1) is pressed against the stop flange at the front end of the square hole through a wedge-shaped pressing block (5).

2. The multi-curved tenon restraint fixture according to claim 1, characterized in that: The support base (8) is provided with a plurality of mounting holes for being connected to the vibration table via bolts.

3. The multi-curved tenon restraint fixture according to claim 1, characterized in that: The radial stop clamp (3) is provided with a threaded hole extending from the side away from the stop groove opening to the stop groove. After the radial tightening bolt (4) passes through the threaded hole, it tightens the radial tightening block (2) located in the stop groove.

4. The multi-curved tenon restraint fixture according to claim 3, characterized in that: The radial tightening bolt (4) of the radial stopping fixture (3) extends out from the rear end of the square hole of the supporting base (8).

5. The multi-curved tenon restraint fixture according to claim 1, characterized in that: The radial tightening block (2) has a receiving groove adapted to the bottom end structure of the tenon of the blade test piece (1), the retaining groove notch is arranged as a contraction opening, and the transition surface between the contraction opening and the retaining groove is adapted to the middle concave structural profile of the tenon of the blade test piece (1).

6. The multi-curved tenon restraint fixture according to claim 1, characterized in that: The stop flange (9) has a first threaded hole and a second threaded hole that pass through the square hole from the outer end surface. The first threaded hole is adapted to be threadedly connected with a main tightening bolt (7), and the second threaded hole is adapted to be threadedly connected with a tightening block radial restraining bolt (6). The main tightening bolt (7) is used to tighten the wedge-shaped tightening block (5) in the square hole along a direction perpendicular to the installation direction of the blade test piece (1). The wedge-shaped tightening block (5) presses the blade test piece (1) forward along the inclined surface of the tenon of the blade test piece (1) onto the stop flange on the front side of the square hole. The tightening block radial restraining bolt (6) is used to extend into the square hole at the rear end of the square hole along a direction parallel to the installation direction of the blade test piece (1) and tighten on the wedge-shaped tightening block (5).

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