SU38811A1 - An instrument for determining soil resistance to leaching - Google Patents

Description

To determine the ohmic resistance of bulk bodies, it is very important that the pressure of the contact plates on the surface of the test body that is in contact with them remains constant. Failure to comply with this condition leads to observation errors, especially since many soils, especially clay, change their volume when humidity changes, and therefore, in the case of a rigid form of filling the sample container, the pressure applied to the wall also changes. including on the electrodes.

In the proposed device for eliminating this phenomenon, the contacts are made adjustable.

In FIG. 1 shows a side view of the device; FIG. 2 is a top view.

The device is a tube 2, between the walls of which the curved bottoms 3 can move along them. These bottoms with the convex side freely contact the ends of the levers 5, 4. Weights are suspended to the free ends of the levers 6. The device with electrical contacts is mounted freely on plate 1, usually glass for convenience of observation.

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A sample of the soil is placed in the device assembled in this way, where it is subjected to pressure from the bottoms 3 by the loads 6. When the volume of the sample decreases or increases, the pressure at the point of contact between the bottoms and the test sample will remain almost unchanged in size, since the bottoms remain under the influence of an almost constant force. It is necessary that the bottoms move depending on the change in sample volume with the least friction. It should be noted that a constant pressure value in this case can only be achieved by using a weight load; springs instead of loads in this device are unsuitable.

The subject matter of the invention.

A tubular device for determining the ohmic resistance of loose bodies, characterized by the use of two crank levers 4-5 located at the ends of a pipe filled with a powder sample, in which arm 5 is designed to suspend an alternating load to it, and arm 4-for transmitting forces from the load to the sample by means of the bottom device 3 which is freely placed in the pipe 2.

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