SU436257A1 - BALLISTIC PENDULUM COPPER FOR PRODUCT TESTING FOR IMPACT IMPACT - Google Patents

Description

one

The invention relates to testing equipment, namely, devices for testing products for impact.

Ballistic pendants are known for testing products for impact, containing two masters installed with the possibility of impact, and means of fixing pegs in the initial position.

A disadvantage of the known copra is that in order to obtain large (over 10-15 m / s) velocities of the impact of the pendulums, it is necessary to create masses with very considerable dimensions, which makes it almost impossible to achieve the indicated velocities.

The purpose of the invention is to increase the speed of collision of ribs without increasing the size of the copra.

For this purpose, the proposed picker was spagged vrash, ayush, it was a platform on which parallel axes were placed parallel to the axis of the turn; In order to achieve a constant rotational speed of the platform, its moment of inertia about the axis of rotation is significantly (e.g., 10 times) greater than the moment of inertia of an assembly about the same axis.

FIG. 1 schematically shows the proposed Koper; in fig. 2 is a diagram illustrating his work.

The pile driver contains a manuta 1 and 2 and a rotating platform 3 on which they are mounted for rotation around axes 4 and 5 parallel to the axis of rotation of platform 3. Matisers 1 and 2 are located on platform 3 so that centrifugal

the forces F and FI acting on them ensured the multidirectional rotation of tankers 1 and 2 relative to platform 3, leading to their collision. Before testing, the pendants 1 and 2 are fixed on the platform 3 in position I with the help of clamps (not shown in the drawing). Platform 3 is then rotated. When the required rotational speed is reached, the latches release manic 1 and 2,

and they, under the action of centrifugal forces F and FI, rotate about platform 3 around axes 4 and 5 before impact in position II. After the collision, the frames under the action of elastic forces are dispersed and are caught by the locking 6 of the final position in the position of the GP.

To avoid the radial (along the suspension of the tandem) component of the acceleration at the time of the matiki impact, the test product is placed on the tandem

before the impact, it rotates in the direction opposite to the direction of rotation of the platform. The absolute speed of this tandem is zero, the centripetal and corpolis acceleration is zero and, therefore, only the acceleration due to the impact will act on this tandem.

Adjusting the relative velocity of collision of the pendulums is achieved by changing the speed of rotation of the platform in accordance with the ratio:

V 4 (i) R,

where V is the relative velocity of the impact

tales

w is the angle of rotation of the platform,

R is the length of the tiger.

The above relation is obtained under the assumption of a constant ω. To ensure this condition, the moment of inertia of the platform relative to its axis of rotation

must be at least an order of magnitude higher than the moment of inertia of the pendants about the same axis.

Subject invention

Claims (2)

1. Ballistic pickaxe for testing products for impact effects, containing two masters installed with the possibility of collision, and means of fixing the pendulum in the initial position, characterized in that, in order to increase the speed of the collision, it is equipped with a rotating platform, on which The axes of rotation are placed on the axes of the tillers, while the tillers themselves are set in a position that ensures their multidirectional rotation under the action of centrifugal forces. 2. The operator of claim 1, wherein the inertia moment of the platform is relative to the axis of rotation is an order of magnitude higher than the moment of inertia of mannikas about the same axis. Rig. i 1-7