SU848637A1 - Deep-well electric mark device for remote measurement of of displacement of rock body - Google Patents

Description

The invention relates to the underground mining of minerals, in particular to determining the nature and magnitude of the deformation of the rock mass. * *

Known string displacement meters with a small displacement base for high-frequency measurement of small displacements [1],

Also known is a downhole electric reference device for remote measurement of displacements of a mountain massif, containing a reference with a contact knife interacting with jumpers of a gap of a sensitive element of a displacement sensor connected to recording equipment (2),

However, in this device, the magnitude of the displacement of the array is determined by the number of pulses of the radioreper, as a result of which false alarms or failures due to unreliability, an open contact-knife operating in a mine atmosphere (the presence of water, * 5 dust) lead to incorrect measurements. Also, a slow change in time of the values of the displacement of the rock thickness can lead to prolonged contact of the wire jumpers with the knife, in turn, leading to the discharge of the power source.

The purpose of the invention is to increase the reliability and accuracy of measurements.

This goal is achieved by the fact that the sensitive element of the sensor is made of series-connected resistances shorted by jumpers.

Figure 1 shows a diagram of the proposed device; figure 2 - displacement sensor, section.

The device consists of a displacement sensor 1 located at the wellhead and a benchmark 2, the deformation of which is examined at different distances from the contour of the rock mass. On the benchmark 2, rod 3 is fixed at one end, the second end of which is made in the form of a knife 4. of dielectric material. Conductor 5 connected to the measuring device 6 departs from the sensor.

The sensor element is made of a chain of series-connected resistances 7 shorted by jumpers 8.

The device operates as follows.

The rod 3 moving from the deformation of the array with a knife 4 cuts the wire jumpers 8 alternately, causing a sequential ... inclusion of resistances 7 that linearly change the voltage in the circuit, recorded by the measuring device 6 for any ⁵ length of the conductor 5.

The accuracy of the strain measurement is determined by the distance between the wire jumpers, and the value.

displacements - by the number of included resistances.

Elimination of an open contact knife operating in an aggressive mine atmosphere increases the reliability and accuracy of measurements of an array of 15 rocks in comparison with the known device and thereby increases the safety of underground work.

The proposed design of the sensor 20 allows you to receive information from several deep benchmarks installed in one well.

The application of the proposed device improves the safety of underground work by increasing the reliability and accuracy of measurements of the displacements of the rock mass and thus makes it possible to more accurately predict the critical value of rock stratification and the risk of collapse of the rock in the production circuit.

Claims (1)

Claim A downhole electrical reference device for remote measurement of rock mass displacements, containing a bench mark with a knife contact interacting with bridges of rupture of a sensitive element of a displacement sensor connected to recording equipment, characterized in that, in order to improve reliability and accuracy of measurements, the sensitive element of the sensor is made of series-connected resistances, shorted by discontinuity bridges.