SU1620914A1 - Installation for friction testing of samples in flat stressed state - Google Patents

Abstract

The invention relates to test equipment, in particular to installations for testing samples for friction in a flat stress state. The purpose of the invention is to expand the functionality by providing tests not only with increasing, but also with decreasing effort of sample reduction, as well as providing tests not only with a hundred

Description

The invention relates to a test apparatus, in particular, to installations for testing samples for friction under a flat stress state under static and shock compression-shear conditions during advances caused by emissions and rock shocks.

The purpose of the invention is to expand the functional capabilities by providing tests not only with increasing, but also with decreasing effort to compress the sample, as well as ensuring tests not only with static (but also with cyclically changing the effort of reducing the sample).

The drawing shows the scheme of

General view. i

The installation contains base 1,

mounted on it at an acute angle to one another two guides 2 and 3, two grippers 4 and 5 of contra-snipers 6 and 7, mounted on the same guide 2 with the ability to move along it the gripper 8 of sample 9 located between grips 4 and 5, the pusher 10, the clamping gripper 8 of the sample 9 with the second guide 3, the load 11 mounted on the guide 2 with the ability to interact with one of the grippers 4 of the counter piece 6, the power spring 12, one end of which is connected to the second gripper 5 of the counterbag 7, reel 13 with a pusher 10, installed with ozhnostyu rolling along the guide 3 by means of wheels 14 mounted on the axis of the drum 13 and a flexible thrust 15 wound on the drum 13, the free end of which is coupled to the second end of the power spring 12.

The installation is equipped with a device (not shown) for changing the direction of winding of the flexible rod on the drum to the opposite. The connection of the first end of the force spring 12 with the second gripper 5 of the contra-sample 7 can be made in the form of a wheel 16 mounted on the second gripper 5 of the contra-sample 7 with the ability to roll along the first guide 2, the disk 17 mounted on a common axis with the wheel 16 and connected with it using the latch 18, and the finger 19, eccentric mounted on the disk 17 and connected to the first end of the power spring 12.

The latch 18 is made of electromagnetic. The load is dropped by a winch 20.

The installation works as follows.

For tests, when reducing the load of reduction, in the initial position, an initial tension is set on the spring 12, and the winding of the ends of the thrust rod 15 onto the drum 13 is carried out in the direction shown in the drawing. Load 11 is dropped with a winch 20 or lowered smoothly. When moving, load 11 displaces grippers 4 and 5 along guide 2, while traction 10 moves along guide 3 and displaces gripper 8 with movement of sample 9 along contrashes 6 and 7. Resistance from the side of the spring 12 creates a force to press the contra-edge 6 against the sample 9 and the contra-ridge 7. As it moves, the wheel 14 rotates with the drum 13, as a result of which the pull 15 pulls from the drum 13 and reduces the deformation

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spring 12 and the sample compressing force 9. When latch 18 is turned on, the wheel 16 rotates the disk 17 with the finger 19, as a result of which the deformation of the spring 12 and sample pressure 9 cyclically change. When the latch 18 is turned off, the disk 17 does not rotate et tension of the spring 12.

For testing, when increasing the load on sample 9 in the initial position, the direction of winding the rod 15 onto the drum 13 is reversed. As the wheel 14 rotates, the rod 15 is wound onto the drum 13 with an increase in the load on the spring 12.

The use of the facility allows one to perform friction tests under new regimes of change in the loading conditions — while reducing or increasing the load of reduction in a static or cyclic change in the load of reduction. It is possible to reproduce on the installation a wider range of conditions for the realization of displacements of the elements of the mountain massif in order to determine the energy consumption for displacements at the moments of occurrence of rock bursts and outliers. The research results can be used in the study of the energy balance with shocks and emissions in the mine.

Claims (2)

1. Installation for testing specimens for friction under a flat stress state, containing a base mounted on it at an acute angle 15 09 0 five 0 five 0 14 scrap one to another two guides, placed on one of them with the possibility of moving along it two grippers of contra-samples, located between them a sample gripper, a pusher connecting the gripper of the sample with the second guide, a load mounted on the first guide with the ability to interact with one of the contra-clamps, a force spring, one end of which is associated with the second contra-clamp claw, a drum connected to the pusher and installed with the ability to roll along the second guide, and a flexible rod wound on a bar Ban, characterized in that, in order to extend the functionality by providing tests not only with increasing, but also with decreasing effort, the sample is compressed, it is equipped with a device for changing the direction of winding of the pull rod on the drum to the opposite, and the free end of the flexible rod connected to the second end of the power spring. 2. Installation under item 1, that is, in order to provide tests not only with static, but with cyclical change of sample compressing force, the connection of the first end of the power spring with the second gripper of the counterpiece a wheel mounted on a second gripper of a contra-arm with the possibility of rolling along the first guide, a disk mounted on a common axis with the wheel and connected with it with a clamp, and a finger eccentrically fixed on the disk and connected to the first end of the power spring.