RU2775854C1 - Stand for impact testing of specimens - Google Patents

Abstract

FIELD: testing equipment.

SUBSTANCE: invention relates to testing equipment, to devices for testing samples, mainly rocks, for strength. The stand contains a base, a guide mounted on it, an accelerating device, including a flywheel with a drive for its rotation, a rod placed in the guide, a device for creating frictional interaction of the rod with the flywheel, a sample gripper interacting with the rod. A platform is additionally installed on the stand, which is fixed on the base perpendicular to the axis of the rod, a gripper is installed on it with the ability to move along the platform, devices for lateral compression of the sample are fixed on the gripper according to the number of compression directions, a gripper position lock is installed on the platform, and a striker is installed on the rod.

EFFECT: expansion of the technological capabilities of the stand under loading both fixed and arbitrarily specified surface areas of both uncompressed and compressed samples.

1 cl, 1 dwg

Description

The invention relates to testing equipment, to devices for testing samples, mainly rocks, for strength.

A known stand for testing samples of materials for stepped impact load (SU patent No. 1633333, publ. creation of frictional interaction of the rod with the flywheel, the grip for the sample, interacting with the rod.

The disadvantage of the stand is that the grip is rigidly fixed to the rod. This does not allow loading individual sections of the sample surface. The sample is loaded over the entire surface at the same time.

A stand for dynamic testing of samples of materials for strength is known (SU patent No. 1597672, publ. 07.10.90), containing a base, a guide mounted on it, an accelerating device that includes a flywheel with a drive for its rotation, a rod placed in the guide, a device for creating a friction the interaction of the rod with the flywheel, the grip for the sample, interacting with the rod.

The design disadvantages are the rigid fastening of the grip on the rod, therefore, during testing, the sample is loaded only over the entire surface without the possibility of loading individual sections of its surface and only under conditions of a uniaxial stress state.

A stand for dynamic testing of samples is known (SU patent No. 1173240, publ. 08/15/1985), containing a base, a guide installed on it, an accelerating device that includes a flywheel with a drive for its rotation, a rod placed in the guide, a device for creating frictional interaction of the rod with flywheel, sample grip interacting with the rod.

The disadvantage is the rigid fastening of the grip on the rod, which leads to a limitation of the technological capabilities of the stand - they do not allow loading individual sections of the sample surface and do not provide testing of the sample in a plane stress state.

A stand for dynamic testing of samples is known (SU patent No. 1629816, publ. 23.02.1991), containing a base, a guide installed on it, an accelerating device that includes a flywheel with a drive for its rotation, a rod placed in the guide, a device for creating frictional interaction of the rod with flywheel, sample grip interacting with the rod.

The disadvantage is that the grip is rigidly fixed on the rod, so testing a sample in a compressed state when loading individual sections of the surface is not feasible.

A stand for dynamic testing of samples is known (SU patent No. 1696959, publ. 07.12.1991) adopted as a prototype, which contains a base, a guide installed on it, an accelerating device that includes a flywheel with a drive for its rotation, a rod placed in the guide, a device for creating frictional interaction of the rod with the flywheel, the grip for the sample, interacting with the rod.

The disadvantage is the rigid connection of the grip with the rod, but stops with weights are installed on the way of its movement.

The technical result is the expansion of the technological capabilities of the stand when loading both fixed and arbitrarily specified surface sections of both an uncompressed and a compressed sample.

The technical result is achieved by the fact that an additional platform is installed, which is fixed on the base perpendicular to the axis of the rod, a gripper is installed on it with the ability to move along the platform, devices for lateral compression of the sample are fixed on the grip according to the number of compression directions, a gripper position lock is installed on the platform, and on the drummer is installed on the bar.

The stand is illustrated by the following figure:

fig. 1 - general view of the device, where:

1 - base;

2 - guide;

3 - flywheel;

4 - rotation drive;

5 - rod;

6 - friction device roller;

7 - friction device lever;

8 - capture;

9 - sample;

10 - platform;

11 - grip lock on the platform;

12 - drummer;

13 - screw;

14 - screw drive;

15 - compressing platform;

16 - support.

The stand for impact testing of samples (Fig. 1) includes a base 1, on which a guide 2 is installed, with the help of supports 16. The booster is fixed on the support 16 and consists of a flywheel 3 with a rotation drive 4. The rod 5 is mounted for movement in the guide 2. The friction device is fixed on the support 16 and consists of a roller 6, which is mounted with the possibility of movement in the direction of the rod 5 on the lever 7. On the rod 5, the drummer 12 is mounted with the possibility of movement.

A platform 10 is fixed on the base 1 perpendicular to the axis of the rod 5. The platform 10 is made of metal, on the surface of which an electric wire is wound along the perimeter with the possibility of connecting to the power supply, which is the grip lock on the platform 11. The grip 8 is made of metal, mounted on the platform 10 with the ability to move. Sample 9 is fixed in grip 8 by means of devices for lateral compression of the sample, which consist of compressing pads 15, screws 13 associated with them, and screw drives 14.

The stand works as follows. The sample 9 is mounted on the grip 8 and the specified compression of the sample is created, for which the screws 13 are rotated by the screw drives 14 and the compression pads 15 apply the specified loads to the sample surface in the specified directions. The gripper 8 with the sample 9 is installed in a predetermined position on the surface of the platform 10 and fixed with a gripper lock on the platform 11 by turning on the lock winding in the electrical network. The drive 7 of the friction device 7 is switched on and the rod 5 is pressed against the flywheel 3 by the roller of the friction device 6 until their frictional interaction. The rod 5 moves along the guide 2 and the impactor 12 strikes the surface of the sample 9 in a given area of its surface. A second blow to a new predetermined area on the surface of the sample is applied after changing the position of the grip 8 on the platform 10, for which the grip lock on the platform 11 is turned off, the grip 8 is shifted to a new position and the grip lock on the platform 11 is turned on again. If necessary, change the compression of the sample, as described above. For testing an uncompressed sample, a device for lateral compression of the sample is not used. The magnitude of the shock pulse is controlled by the acceleration speed of the flywheel 3 and the mass of the impactor 12. The contact patch of the impactor with the sample surface is set by the design of the impactor 12.

The proposed stand provides testing under loading of both fixed and arbitrarily defined surface areas of both uncompressed and compressed samples, which expands the technological capabilities of the stand. The location of the places of application of shock pulses, their magnitude, the intervals between them, the level of compressive loads and other parameters significantly affect the energy consumption during breaking, which can be studied on the proposed stand, which has the appropriate technological capabilities.

Claims (1)

A stand for impact testing of samples, containing a base, a guide installed on it, an accelerating device, including a flywheel with a drive for its rotation, a rod placed in the guide, a device for creating frictional interaction between the rod and the flywheel, a gripper for the sample interacting with the rod, characterized in that that a platform is additionally installed, which is fixed on the base perpendicular to the axis of the rod, a gripper is installed on it with the possibility of moving along the platform, devices for lateral compression of the sample are fixed on the gripper according to the number of compression directions, a gripper position lock is installed on the platform, and a striker is installed on the rod.

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