SU1490529A1 - Rig for impact testing - Google Patents

Abstract

This invention relates to a testing technique. The aim of the invention is to reduce the dimensions of the stand. The pneumatic acceleration device of the stand is equipped with a receiver 9 concentrically located relative to the cylinder 6, communicated with the rod cavity 12 by longitudinal windows 13, starting from the initial installation of the piston 7. When the release pressure is created in the piston cavity 10, the piston 7 begins to move, the receiver 9 communicates with the cavity 10 through increasing the cross-sectional area of the windows 13, the pressure in the cavity 10 increases according to the required law. This leads to the acceleration of the piston 7 with the rod 8 and the platform and the transfer of the required acceleration pulse to the test product. When braking the piston 7 due to the increasing pressure in the cavity 12, the platform separates from the rod 8 and is smoothly braked by the device. 2 Il.

Description

The invention relates to testing equipment, namely to dynamic stands with pneumatic accelerating devices.

The aim of the invention is to reduce the dimensions of the stand.

FIG. 1 schematically shows a stand, a general view, in FIG. 2 - a device for accelerating the platform, a slit.

The shock test bench pt contains a base 1 with guides 2, a platform 3 mounted in the guides 2 for fastening the test article 4, a pneumatic device 5 for accelerating the platform 3, including a cylinder 6 installed in

there is a piston 7 with a rod 8 connected to platform 3 with the possibility of separating the latter after acceleration, a receiver 9 communicating with a cylinder 6, a piston cavity 10 of which, in the initial position of piston 7, communicates with a receiver 9 to create a force for moving the piston 7, a device 11 for braking the platform 3. The receiver 9 is disassembled concentrically to the cylinder 6 and communicated with its rod cavity 12 by means of longitudinal windows 13 formed in the cylinder 6, starting from the place of the initial installation of the piston 7. In the cylinder 6 there is a stop 14 for forming the cavity 10. uchae vertical acceleration platform

4i SB

ABOUT

after that

with

downwards, the stand is equipped with a release device 15 for keeping the platform 3 in its initial state. In this case, two overclocking devices 5 are used that are installed symmetrically.

The stand works as follows.

Before testing, product 4 is installed on platform 3, compressed gas is supplied to receiver 9 with the pressure necessary to obtain the required acceleration of product 4. Gas from receiver 9 fills rod cavity 12 through longitudinal windows 13, and through leaks between piston 7 and cylinder 6 fills the cavity 10. When the pressure in this cavity increases to a value sufficient to trigger the piston 7, the gas penetrates between the end of the piston 7 and the stop 14, the force on the piston 7 increases sharply, the platform 3 releases the trigger device 15 and starts moving e. The piston 7 opens the longitudinal windows 13 to communicate the cavity 10 with the receiver 9, compressed gas from the receiver 9 begins to flow intensively into the cavity 10, increasing the working pressure in the cavity 10, increasing the force on the piston 7 with the rod 8, which, on the platform 3 It accelerates it by forming on the tested product 4 the leading edge of a shock loading pulse. The characteristics of this pulse front can be set by choosing the area of the flow area of the windows 13 along the motion of the piston 7, i.e. due to the width of the windows 13 When the piston 7 approaches the end of the windows 13, its braking begins

due to the increasing pressure in the rod cavity 12, the platform separates from the rod 8, is gently slowed down by means of the device 11 and stops.

Stand construction due to shorter acceleration devices

due to the concentric location of the receiver 9 relative to the cylinder 6 and the gas inlet into the cavity 10 through the windows 13 has smaller dimensions as compared with the well-known stand,

which the receiver and cylinder are arranged in series.

Ula Invention Form

A shock test bench containing a base with guides installed in the guides a platform for fastening the test product, a pneumatic device for accelerating the platform, including a cylinder, a piston installed in it with a rod connected to the platform with the possibility of separating the latter after acceleration, the receiver communicated with a cylinder, the piston cavity of which, in the initial position of the piston, communicates with a pressure source to create a force for moving the piston, and a device for braking the platform, differing In order to reduce overall dimensions, the receiver is located concentrically to the cylinder and communicated with its rod cavity by means of extended windows in the cylinder, starting from

the initial installation of the piston.

Claims (1)

Claim Impact test bench, containing a base with guides> a platform for mounting the test product in the guides, a pneumatic device for accelerating the platform, including a cylinder, a piston installed in it with a rod connected to the platform with the possibility of separating the latter after acceleration, the receiver in communication with a cylinder, the piston cavity of which in the initial position of the piston is in communication with a pressure source to create a force to move the piston, and a device for braking the platform, characterized in that, in order to reduce the dimensions, the receiver is concentric with the cylinder and communicated with its rod cavity by means of longitudinal windows made in the cylinder, starting from the place of initial installation of the piston. Order 3745/48 Circulation 789 Subscription VNIIIPI of the State Committee for Inventions and Discoveries at the State Committee for Science and Technology of the USSR 113035, Moscow, Zh-35, Raushskaya nab., 4/5 Production and Publishing Plant Patent, Uzhhorod, st. Gagarina, 101