SU1582067A1 - Installation for impact loading of specimens - Google Patents

Abstract

The invention relates to facilities for testing the strength of materials and products during repeated shocks and allows for expanding the functionality by loading the sample areas with shocks not only with constant but also with cyclically varying force. On base 1, a shelf 2 with coaxial claws 3 for sample 4 and a drum 5 with a drive for its rotation are mounted. Along the circumference of the drum, in several rows along its generator, on the hinges 10, there are strikers in the form of elastic plates 8 with strikers 9 of different weights. The drum encompasses the sleeve 12 coaxial with it, with its rotation driving, in the side surface of the sleeve there are slots for passing the impactors through them. Recesses 11 are made on the surface of the drum 5 to accommodate the respective strikers 9. When the drum 5 rotates counterclockwise and the fixed sleeve 12, the elastic plates 8 approach the slots in the sleeve and, unbend, hit the pattern 4. Shock sizes The pulses vary with a predetermined ratio depending on the weight of the strikers 9. When the sleeve 12 and the fixed drum 5 rotate, the same impactors act on the sample, the force of impacts on each part of the sample does not change. 2 Il.

Description

 31582067

This invention relates to a tester.

for testing samples of materials and products for durability during repeated shocks.

The purpose of the invention is to expand the functionality by loading the sample areas with shocks not only with constant but also with cyclically varying force.

Figure 1 shows the proposed installation, the overall look; figure 2 - section aa in figure 1.

The installation for shock loading of samples consists of a base 1, a shelf 2 with coaxial grippers 3 for sample 4, a drum 5 whose axis 6 is parallel to the axis of the grippers 3, a drive

7 rotation of the drum 5, drummers in the form of elastic plates 8 with strikers 9 different masses, devices for cocking and descent of the impactors. Drummers are mounted around the circumference of the drum

5 in several rows along its generatrix. Each of the plates 8 is fixed at one end on the surface of the drum by means of a corresponding hinge 10, the axis of which is parallel to the axis

6th drum. Recesses 11 are made on the surface of the drum 5 to accommodate the respective strikers 9. The device for cocking and lowering the strikers is made

in the form of a sleeve 12, coaxially with the drum 5 and covering it with a gap 13, intended to accommodate shock, and a drive 14 of rotation of the sleeve.

8 of the side surface of the sleeve 12 are made slots 15, offset one from the other along the sleeve perimeter a distance a. The striking hour 16 of the striker 9 can be performed, for example, in the form of cutters, knives, etc. The number of slots 15 is equal to the number of rows of strikers along the generator of the drum

5. The width of the slots should not be less than the width of the plate 8, and the length of the slots should not be less than the length of the plate 8. The number of slots is equal to the number of areas of loading the sample along its length, the number of plates 8 in one row around the perimeter of the drum 5 is equal to the number of pulses in the cycle. The distance in the relative displacement of the slits 15 corresponds to a predetermined lag interval when striking various portions along the length of sample 4.

ten

five

0

five

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five

five

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45

50

The installation works as follows.

For tests in the mode of cyclically varying impact forces at each sample loading section, the actuator 7 is turned on and the drum 5 is rotated counterclockwise (Fig. 1). The elastic plates 8 alternately approach the slots 15, elastically restore their deformation and striker 9 strike the model 4. The ratio of the magnitude of the shock impulses is set by the weight ratio of the strikers 9. For testing in a mode with a constant force of impacts, the drum rotation actuator 7 is turned off and include the drive 14 rotation of the sleeve. When the sleeve 12 rotates, the slots 15 rotate and the platoon alternately rotates and the plates are released. In this case, the plates 8 installed at the impact position strike the sample 4, with each portion of the sample surface being serviced by the same plate, i.e. each section is loaded with impacts of the same force. The loading frequency is controlled by the speed of rotation of the sleeve or the speed of rotation of the drum, depending on the mode of loading.

Claims (1)

Invention Formula The installation for shock loading of samples, containing the base and the percussion devices installed in it in the form of elastic elements with strikers at one end, a shelf with coaxial grips for the sample and a device for cocking and lowering the impactors, Owing to the fact that functionality by loading sections of the sample with impacts not only with a constant, but also with a cyclically varying force, it is equipped with a drum, whose axis is parallel to the axis of the grippers, and its rotational drive, the elastic elements are made in the form of a plate installed around the circumference of the drum in several rows along its generator and fixed by other ends on its surface by means of corresponding hinges, whose axes are parallel to the axis of the drum, the heads are of different weights and placed in the corresponding recesses, which are made on the drum surface of the platoon and descent of the strikers is made coaxial with the balaban and the plate covering it51582067 The sleeves are driven by its rotation, into slots designed for the passage of the lateral surface of which are made of corresponding plates with strikers. Thebes. 2