SU1453204A1 - Exciter of impact load for test bed - Google Patents

Abstract

This invention relates to a testing technique. The aim of the invention is to ensure the stability of the exciter in a wide range of parameters of the shock pulse and the mass of the test objects. The shock load exciter comprises a pneumatic cylinder 1 connected to a high pressure gas source, and a plunger 2 having a flange 3 at the end, equipped with a mechanical seal 4, which interacts with the bottom of pneumatic cylinder 1 and forms an end cavity 5 connected to a controlled high pressure gas source. The plunger 2 has a blind cavity 6 and a group of through channels 7 in the side wall, which are initially located inside the pneumatic cylinder 1. When the exciter operates, after the ram 2 ram accelerates, the channels 7 exit the pneumatic cylinder I and the gas in the cavity 6 is discharged into the atmosphere . By releasing a strictly constant amount of air, the rebound of the moving parts of the stand associated with the plunger is ensured. 1 il. i С /) С

Description

The invention relates to testing equipment, in particular to shock pathogens used in test benches.

The purpose of the invention is to ensure the stability of the shock exciter, including a pneumatic cylinder with a plunger that transfers the load to the test object, in a wide range of variation of the parameters of the shock pulse and the mass of the tested objects, due to the reliable prevention of repeated shocks by releasing into the atmosphere is strictly defined- J5 a lot. the amount of gas after ramping the plunger to the required speed.

The drawing shows the proposed pathogen shock load.

The causative agent of shock load 20 contains a pneumatic cylinder 1 connected to a high-pressure gas source (not shown) and a plunger 2 having a shoulder 3 at the end inside the pneumatic cylinder 1, equipped with a mechanical seal 4, which interacts with the bottom of the pneumatic cylinder 1 and forms a mechanical cavity 5 connected to a controlled source of high pressure gas (not shown). thirty

The plunger 2 has a blind cavity 6 and a group of through channels 7 made in its side wall.

• The proposed pathogen shock to the test bench works as follows.

Before starting, the cavity 5 is connected to the atmosphere and the pneumatic cylinder 1 is filled with compressed air. In this case, the plunger 2 is pressed against the bottom of the pneumatic cylinder 1, since the diameter of the seal 4 is larger than the outer diameter of the plunger 2.

When starting into the cavity 5 serves compressed air. When the force of air pressure in the cavity 5 becomes greater than the force pressing the plunger 2 to the bottom, the plunger 2 begins to move. Together with plunger 2, collar 3 moves with seal 4. The latter opens- ^ from the bottom, the tightness of cavity 5 is broken, compressed air located in pneumatic cylinder 1 starts to accelerate plunger 2, pushing it out of pneumatic cylinder 1. The area of channels 7 is quite large and the air from by- . Blade 6 flows freely into the cavity of the pneumatic cylinder 1. After the ram 2 is accelerated, dynamic loading of the test object occurs.

When the channels 7 exit the pneumatic cylinder 1, there is a release of compressed air from the cavity 6 into the atmosphere.

After creating a dynamic load, the plunger 2 moves in the opposite direction. Channels 7 enter the pneumatic cylinder 1. At this point, almost all compressed air is already leaving the cavity 6 and the pressure in it decreases to a value close to atmospheric pressure.

When the channels 7 enter the cavity of the pneumatic cylinder 1, part of the compressed air in it flows. into the freed cavity 6 and the pressure in the pneumatic cylinder 1 drops.

Moving in the opposite direction, the plunger 2 compresses the air remaining in the pneumatic cylinder 1, the movement of the plunger 2 slows down. After stopping, plunger 2 is held by stand mechanisms (not shown).

Due to the discharge of a strictly constant amount of compressed air from the pneumatic cylinder, a stable pressure decrease is ensured in it, which ensures a stable rebound of the moving parts of the shock test bench connected to the plunger in a wide range of changes in the parameters of the shock pulse and the mass of the test objects.

Claims (1)

Claim The causative agent of the shock load to the test bench, containing a pneumatic cylinder connected to a source of high pressure gas, and a plunger inserted with a seal into the cavity of the pneumatic cylinder, one part of which is in the initial position outside the cavity of the pneumatic cylinder, and the other part has a flange with an end seal interacting with the bottom of the pneumatic cylinder and forming an end cavity connected to a controlled high-pressure gas source, the plunger having a cavity and through channels in the side wall, distinguishing The reason is that, in order to ensure stability of operation in a wide range of changes in the parameters of the shock pulse and the mass of the test objects, the cavity of the plunger is blind, and the channels in its wall are in the initial position inside the pneumatic cylinder.