SU1209865A2 - Instrument for mechanical testing of rock - Google Patents

Description

I

The invention relates to devices for determining the mechanical properties of rocks, can be used to determine the strength and deformation characteristics of rocks under laboratory and field conditions and is an improvement to the device according to the author. No. 641098.

The purpose of the invention is to increase test performance.

Fig si shows the upper part of the device, forming a power cylinder and a manual screw drive of a hydraulic system, when testing hard rocks; figure 2 - the same, when testing weak rocks.

All units of the device are assembled on a cylindrical body 1 with rectangular windows and an annular support 2. At the body cover 3 there is a manual screw drive of a hydraulic system consisting of a piston 4, a screw 5 with a handle and a nut 6. The power hydraulic cylinder 7 of the device is formed by the upper part housing 1 and contains the main power piston 8, inside of which and coaxially with it is installed the spring 9, interacting. with the housing of the device and the auxiliary piston 10 located in the main pimple 8, inside which the spring 11 is coaxial with it and interacts with the main piston 8.

The device works in the following way.

During testing, the load on the sample is created by rotating the handle of the screw drive of the hydraulic system by moving the piston 4, which is transferred by the working fluid to the main B and the auxiliary 10 power pistons.

When testing hard rocks (figs), pistons 8 and 10, compressed by a spring 11, move together from

2P98652

extreme top position down. At the same time, they compress the spring 9 due to which it stores the energy necessary for breaking through

5 the stroke of the friction forces of the main piston 8 o hydrocylider 7 and the weight of the movable parts of the device (pistons 8 and 10 and springs 11); After the sample of the piston 8 and 10 is destroyed, 10 months ago return to the initial position (upper) by spring 9, and liquid - due to vacuum in the hydraulic cylinder 7 during the reverse rotation of the screw handle

15 yes hydraulic systems and piston movements 4,

and also under the action of buoyancy of the pistons 8 and 10

When - tests of weak rocks (figure 2), the main power piston 8

20 is pre-biased to the annular abutment 2, and the tests are carried out by an auxiliary power piston 10, which, by moving, stretches the spring 11, as a result of which it seals the energy necessary to return the piston 10 idling. After the sample is destroyed, the piston 10 returns to its initial position by the spring 11, and the working fluid

30, the dilution effect in the hydraulic cylinder 7 during the reverse rotation of the handle of the screw drive of the hydraulic system and the movement of the piston 4, as well as due to the release force of the piston 10.

The proposed design of the device allows, due to the presence of springs, to eliminate air leakage into the hydraulic system and thereby eliminate unproductive labor costs for preparing the device for operation in the production of measurements; due to the absence of air in the hydraulic system, the prevention of pre-dynamic impacts at the time of the destruction of rock samples and

 We can improve the accuracy of determining the strength and deformation characteristics of rocks.

35

FIG. 2

Compiled by V. Petrov Editor S. Patrusheva Tehred A. Kykemezey Proofreader V. But ha

Order 481/42 Circulation 470. Subscription.

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch of PPP Patent, Uzhgorod, Proektna St., 4

Claims (1)

DEVICE FOR MECHANICAL TESTS OF ROCKS by Auth. 1? 641098, characterized in that, in order to increase productivity, cavities are made in the main and auxiliary pistons, the device is equipped with two springs, one of which is installed. inside the auxiliary piston, with the possibility of interaction with the main piston, and the other inside the latter with the possibility of interaction with the device body.