SU949378A1 - Stand for article impact testing - Google Patents

Description

The bench contains a holder 1 installed on it in the possibility of rotation around an axis parallel to the axis of swing of the instrument 1, a table 2 for placing a test article on it (not shown), means for forming a shock impulse including movable stops 3 and 4 and controlled driving mechanisms, means of orientation of the table 2, made in the form of a transmission with a flexible link 5, the pulley 6 of which is fixed to the swing axis of the mandrel 1, and the pulley 7 is connected to the table 2.

The suspension of the tambour 1 is made in the form of an elastic beam 8. The mechanism for inserting the stop 3 into the intersection, the mode with the elastic beam 8 when the tang 1 falls and the output of the stop 3 after one oscillation cycle of the beam 8 is an electromagnetic drive 9 with a lever system 10 and the mechanism for inserting the stop 4 into interaction with the beam 8 during its return stroke under the action of elastic forces is the electromagnetic latch 11, the spring 12 for moving the stop 4 and the spring lock 13 of the working position of the stop 4. The stand also includes an actuator (not shown) for lift man 1, bullets t controls (not shown) by triggering mechanisms for input and output of stops Z. and 4 associated with strain gauges 14,

pasted: on the beam 8, and the friction brake 15 to stop the tandem 1 with the drive 16.. The stand is equipped with two pairs of probes 3 and 4 for the realization of vertical and horizontal shocks.

The stand works as follows. The article to be tested is fixed on the table 2. With the aid of a drive for lifting the tang 1, it is installed

to the initial position shown in FIG. 1 by dashed lines. Using the mechanism for moving the stop 3, it is installed in the path of movement of the beam 8. The barrel 1 releases and he, pada, hits against the stop 3. At the same time, under the action of the inertia forces, the beam. 8 is deformed. This deformation is measured by strain gauges 14, when a predetermined voltage proportional to the deformation is reached, the control unit sends a signal for inserting the stop 4 into engagement with the beam 8, which is triggered by the magnetic latch 11, turning the stop 4 by the spring 12 and fixing it with a spring lock 13 During the second phase of the oscillation of the beam 8, the table 2 goes through an equilibrium position and will continue to move deforming the beam 8 in the fraternal direction, the polarity of the load of the strain gauges 14 changes by

the opposite, which leads to the activation of the mechanism for outputting and inserting the anvil 3, with the aid of the actuator 9, the lever system 10 removes the anvil 3 from the interaction with the beam 8, which 5 continues to move under its own weight after one full oscillation cycle. At the same time, the control unit sends a signal to the friction brake 15,

which suppresses the free oscillations of the elastic beam 8 and its movement around the axis of rotation of the rim 1.

The described stand allows the loading of the test objects.

with an acceleration pulse over the full sinusoid cycle, while on known shock stands the test object is loaded with either a shock pulse in the shape of a half-wave sinusoid, or a high-cycle damped sinusoidal

momentum.

Claims (2)

1. Lupinsky M.M. and Savitsky F.S. Methods and means of calibration of equipment for measuring shock accelerations. Overview of the middle. Metrologists and measuring equipment in the USSR, 1972, p. 23. 2. USSR author's certificate No. 227655, cl. G 01 N 3/30, 1967 (prototype).