A Straight Edge Constraint Device for Variable Angle Curved Plates

Abstract

The invention discloses a variable-angle curved plate straight edge constraint device and belongs to the field of an airplane strength test. The device comprises a top wheel and a triangular adjustable mechanism for adjusting the top wheel, one end of the top wheel is provided with a rolling wheel (101), and the top wheel contacts a curved plate test piece through the rolling wheel (101); and, in the triangular adjustable mechanism, the first vertex of the triangular adjustable mechanism is connected with the other end of the top wheel (1), the second vertex is connected with a column, the third vertex is a hinge point, a hypotenuse connecting rod (6) is hinged between the first vertex and the second vertex, the length of the hypotenuse connecting rod (6) is adjustable, and a leg connecting rod (8) the length of which is adjustable is disposed between the first vertex and the third vertex. Through adjustments of lengths of the connecting rods of the triangular adjustable mechanism, directions of constraints of the top wheel are directions of the normal lines of legs of the curved plate test piece, constraint conditions of the legs of an airplane curved plate can be accurately simulated, and load requirements of curved plates in different curvatures are met; and the device has the advantages of simple installation and high universality.

Description

technical field [0001] The invention belongs to the field of aircraft strength tests, and in particular relates to a straight-edge constraint device for a variable-angle curved plate. Background technique [0002] In the aircraft structural strength test, especially the fatigue test of the fuselage curved plate, when the axial tension / compression load is applied, the straight edge in the circumferential direction should be constrained. By constraining the normal direction of the curved plate, the axial Orientation is not constrained. [0003] At the current stage, the device that realizes the restraint of the straight edge of the curved plate is usually the top wheel device, such as figure 1 As shown, firstly, the column connecting rod is fixed to the column by bolts, then the top wheel connecting rod is connected to the column connecting rod through a screw sleeve, and finally the top wheel and the top wheel connecting rod are connected through threaded holes, so as to con...

AI Technical Summary

Problems solved by technology

The top wheel device has two disadvantages. First, since the column is fixed, the top wheel device can only extend in a 90-degree direction along the side of the column, so the constraint angle of the top wheel is not the actual curved plate test piece method. Second, because the direction of the top wheel is not along the normal direction of the curved plate test piece, and the width of the roller cannot be completely pressed against the straight edge, so the roller of the top wheel should be turned 90 degrees, so that the roller is in the direction of the test piece. When pulling / compressing axially, there will be friction on the rollers

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