SU1696880A1 - Water collector level control sensing head - Google Patents

Abstract

This invention relates to a technique for monitoring and controlling coal mining processes. The purpose of the invention is to increase the reliability of the sensor. As sediment appears at the bottom of the catchment basin and at a constant low water level at the moment the pump stops, the sensor position deviates from the initial to the current one with a slope angle. The resistance of the resistor, which determines the current in the measuring circuit, changes accordingly. The current in the circuit of the measuring device is proportional to the thickness of the sludge at the bottom of the sump. 5 il.

Description

The invention relates to a technique for monitoring and controlling technological processes, coal mining, and more specifically to a silting level control technique in a shaft water collector.

The aim of the invention is to improve the reliability of the sensor for monitoring the level of sediment in the sump basin.

Fig. 1 shows the construction of a sensor for monitoring the level of sediment in a sump, front view; Figure 2 is the same side view; FIG. 3 shows the connection of a resistor with a measuring device; Fig. 4 shows the working position of the sensor in the sump with the complete absence of sediment; Figure 5 - the same, in the presence of a layer.

The sensor contains a sealed housing 1, shaft 2, bearings 3 and 4, a variable resistor 5, a rod 6, a lower housing cover 7, a probe 8, wires 9 and 10, an upper housing cover 11, a measuring device 12, a connecting wire 13 of the current source 14.

The hermetic case 1 should be made of a material resistant to aggressive media. The bottom 7 and top 11 covers of the housing 1 are made of conductive material. When this shaft 2 is located inside the housing 1 and is fixed movably relative to it with bearings 3 and 4.

In addition, the sensor contains a variable resistor 5, the rotatable part of which is connected to the shaft 2, the variable resistor case is connected to the sensor case 1, the rod 6 is rigidly connected to the shaft 2, the probe 8 is attached to the cover 7, the wire 9 connects one contact a resistor 5 with a bottom 7, and a wire 10 connects a second moving contact of a resistor 5 to a measuring device 12. The current source 14 is connected by one pole through a wire 13 to a measuring device 12, and the second to the ground.

Figure 4 shows the sensor assembly 15 installed in the sludge collector 16 cleared at a constant low level.

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not water 17, determined by the position of the suction inlet 18 of the pump. Figure 5 shows the same sensor 15 in the sump 16. When a layer 19 of sludge has formed at the bottom of the sump under a layer of water 17.

The device works as follows.

The sensor 15 is installed in the sump 16, completely cleaned of sludge, so that the tip of the probe 8 of the sensor 15 touches the bottom of the sump. The sensor 15 occupies a vertical position, the angle formed by the axis of the sensor 15 and the axis of the rod 6, in this position is minimal, almost equal to 0, it corresponds to the initial resistance value of the variable resistor 5, and hence the initial current value in the measuring device 12. The magnitude of the current in the circuit of the measuring device is equal to

1GK n

where U is the voltage;

RH is the initial resistance of the variable resistor of the sensor.

Initial installation of the sensor and measurement of the sediment size in the sump is performed immediately after the pump is turned off at a constant lower water level in the sump. When the water collector is filled with water, the sensor floats up, which prevents the silting of its probe and, as a result, the loss of disability.

As the sediment appears at the bottom of the catchment basin and at a constant lower water level at the moment the pump stops, the sensor position deviates from the initial one with an angle of 1 90 ° to the current one with a slope angle

and a At the same time, the position of the axis of the sensor stem always remains vertical, and the position of the axis of the sensor also deviates from the vertical, depending on the thickness

of the silt at an angle a. As a result, the shaft 2 rotates relative to the sensor body, the movable contact of the resistor 5 connected to the shaft 2 is also rotated by an angle a 2 proportional to the thickness of the layer

silt in the sump. The resistance of the resistor 5 varies accordingly, which determines the current in the circuit of the measuring device 12. Current. in the circuit of the measuring device is proportional to the thickness of the sludge at the bottom of the sump. If you make a calibration of the measuring device, i.e. to determine the value of the current corresponding to each fixed value of the sludge thickness, then in the future by the magnitude of the current in the circuit of the measuring device one can judge the value of the sludge thickness.

Claims (1)

DETAILED DESCRIPTION OF THE INVENTION A sensor for monitoring the level of sediment in a sump containing a float on which a measuring unit with a sensitive element associated with a display unit is placed, characterized in that, in order to increase reliability, the measuring unit is designed as a probe rigidly connected to the float. wherein the sensing element is placed in a hermetic float body and is made in the form of a variable resistor, the axis of which is rigidly connected through the shaft with a rod pivotally fixed relative to the float body, with the body n The melt contains upper and lower conductive covers associated with the variable resistor and the display unit. eight Fig1 Fie.2 ShyyZ Fy at