RU1803753C - Impact test stand - Google Patents

Abstract

SUBSTANCE: platform (7) with a test article (8) is accelerated by a piston hydraulic motor (6), in the working chamber of which, a pressure impulse is formed, connected to the atmosphere by a hole (16). The device for generating a pressure pulse includes a movable element (5) accelerated towards the chamber with a profiled needle (3) fixed to it and inserted into the chamber through the hole (16). When the needle enters the chamber, a variable gap is formed between the needle and the hole for fluid to flow. 2 ill.

Description

Knowledge.

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Figure 1,

The invention relates to a shock testing technique for products, in particular, to stands reproducing single shock pulses at the acceleration stage.

The aim of the invention is to expand the operational capabilities of the stand by increasing the maximum acceleration (overload) and mass of the test products and increase the maximum stiffness of reproduced shock pulses,

Fig. 1 shows a shock test bench with a linear piston hydraulic motor; Fig. 2 is an embodiment of a stand with a rotary piston hydraulic motor.

The main components of the stand are the working chamber of the hydraulic motor 1, the movable element 2 with a profiled needle 3, the guide 4 for the movable element and the drive 5 for acceleration, the piston, the hydraulic motor 6 and the platform 7, on which the test item 8 is installed. Camera cavity 9 and the under-piston cavity 10 of the hydraulic motor is communicated and filled with a working fluid. The piston 11 of the hydraulic motor is mechanically connected to the platform 7 and is equipped with shock absorbers 12 and 13, forward and reverse, respectively. The rotary hydraulic piston (Fig. 2) is also equipped with shock absorbers 14 and 15 forward and reverse (rotation).

A pressure impulse is generated in the cavity 9 of the working chamber as a result of simultaneous instantaneous displacement of fluid into the piston cavity 10 of the hydraulic motor and through an alternating gap formed by the hole 16 and the profiled needle 3 entering it. The kinetic energy of the movable element with the needle, determined by their mass and acceleration speed converted to pulse pressure operation

fluid to the hydraulic piston and, accordingly, to the work of accelerated movement of the platform with the test product installed. The law of acceleration of the test mass during acceleration (the maximum amplitude and duration of its rise, duration of decline) is determined by the profile of the needle 3, its length and the kinetic energy of the movable element 3 on which the needle is mounted.

This shock test bench allows you to significantly expand the range of tested products by expanding the range of maximum overloads and

masses of tested products and the range of maximum hardness of reproduced shock pulses.

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Claims (1)

The claims Impact test bench comprising a platform for mounting the product, a piston hydraulic motor for accelerating the platform, the piston of which is connected a platform, and the working chamber is provided with an opening for communicating with the atmosphere, and a device for generating a pressure pulse in the working chamber of the hydraulic motor, comprising a movable element with a profiled needle fixed thereon, intended to form a variable gap between it and the opening of the working chamber for fluid outflow, and means for accelerating the movable element with a needle, characterized in that, in order to expand operational capabilities by increasing the maximum overload and mass of the tested products, profiled needle removed from the camera, and the movable element with the needle is installed with the possibility of acceleration in the direction of the camera.