SU1448223A1 - Dynamometer - Google Patents

Abstract

The invention relates to underground mining systems for mineral deposits with the laying of a goaf. In order to increase labor productivity, the force-receiving disk 1 of insulating material is connected to tube 5, and the supporting disc 2 with rod 6 freely moves in tube 5 and has a seal 7. On disks made of insulating material, electrodes of zinc 3 and graphite 4 are strengthened galvanic vapors formed on each disk are switched in opposite through the switch and the discharge-amplitude meter. The dynamometer is installed in the body of lintel 8 on the formwork so that the soil pressure vector P acts on the force-syringing disk 1. Sub. by the action of compressive stresses, pairs are deformed and cracks open in a direction parallel to the plane of the electrodes of the permissive disk. There is a direct relationship between the pressure on the power distribution of the disk and the discharge current generated by this device. 3 il. and S (L

Description

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The invention relates to underground mining of mineral deposits with the laying of a goaf and can be used in mining.

The purpose of the invention is to increase the productivity of labor.

Figure 1 shows the jumper with a dynamometer installed in it, a general view; Fig. 2 shows a disc of insulating material with zinc rings and graphite glass attached to it; FIG. 3 is an electrical diagram of a dynamometer.

The dynamometer consists of a power-perceiving 1 and supporting 2 disks, on which electrodes in the form of rings of zinc 3 and glass graphite 4 are attached. The silo-receiving disk 1 is connected to tube 5, and the supporting disk 2 is connected to rod 6 freely moving in tube 5. On The rod 6 has a sealer 7. The dynamometer is installed in the body of lintel 8 during its construction in the formwork 9.

The dynamometer works in the following way.

In the nponecte of the erection of the lintel, when the level of concrete reaches the midpoint of the lintel, a dynamometer is placed in the solution in such a way that the disk 1 is located in the area subsequently in contact with the filling mass and the disk 2. with free surface jumper. Electrodes 3 and 4 are in direct contact - contact with the solution,

From the point of view of electrical properties, hardening jumper material is represented in the matrix of the electrolyte; electrolyte, which is found in the pores of the solid, electrolyte carrier. The electrical conductivity of the solid phase, la somewhat. therefore, the solid conductivity of the electrolyte is therefore considered to be a solid phase, non-conducting electric current, L {liquid as a result of the action of the capillary forces does not flow, but has the properties of an electrolyte, in which there is no convection. The interconnectedness of the mechanical and physical structure underlies the action of the proposed device. .

If, in the process of its formation, the electrodes are made of materials with different values of normal potentials,

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Electrodes EMF occurs, the value of which depends on. type of electrodes and electrical parameters of the hardening medium.

When the external circuit closes between the electrodes and the measuring system, the electric current begins to flow, the potential difference decreases, and the magnitude of the discharge current also decreases. The reason for the drop in current in the concentration polarization of the electrodes is due to the fact that as a result of the reactions coming from the material under study, the region bordering the electrodes is depleted in the reacting substance, and vice versa, it is enriched in the reacted particles of the substance. The magnitude of the discharge current increasingly depends on the diffusion of substances near the electrode, which, in turn, depends on the concentration of these substances and the mobility of the ions in the intercrystalline space of the medium under study.

The pressure vector P, acting normally to the plane of the electrode, under the action of compressive stresses causes deformation of the pores and the opening of cracks in a direction parallel to the plane of the electrodes of the driving drive disk. Such deformations reduce the distance of the conductive channels of the cracks and bring the ion-rich distant portions of the pores to the electrode surface. This improves the conditions for the removal of non-polar particles of a substance from the electrodes of the silo-sensing disk and for the supply of a reactive substance to the ions. .

The electrodes of the supporting disc are outside the zone of action of pressure, therefore the magnitude of the discharge current of these electrodes is determined by the properties of the concrete of which the bridge is made. The supporting disk is required to compensate for possible temperature changes inside the jumper by turning on the galvanic pairs formed on each disk, counter through switch 10 and meter 11 discharge current (Fig. 3).

The purpose of shunt 12 is to obtain the maximum value of the discharge current. In this case, the effect of concentration polarization is most fully manifested and the information content of measurements is increased. In this connection, the shunt size should be minimal, at which the sensitivity of the measuring device ensures the reliable fixation of the measured value.

Claims (1)

Invention Formula A dynamometer for measuring the pressure on the filling straps, consisting of a force-sensing disk connected to the tube, and a supporting disk connected to the rod, the rod body located coaxially in the body of the tube, distinguishing so that, in order to improve labor productivity, the perceiving and supporting disks are made of insulating material and are located on filling straps, and on the inner side of the disks there are electrodes which are made of materials with different values of normal potentials. The disk galvanic pairs are switched on through a common switch and a meter of the amplitude of the discharge current. Pui. t ten