SU1451282A1 - Apparatus for automatic locating of wave source ,particularly, in mine working atmosphere - Google Patents

Abstract

This invention relates to the safety of mining operations in hazardous conditions. The goal is to increase the reliability of the detection of wave sources by continuously carrying out the process of selecting waves propagating in the atmosphere of mining in the direction of their compression asch & 15ros distribution. The device contains two sensitive elements 1 and 2, which through the corresponding blocks 3 and 4 of the signal selection are connected to the inputs of the formers 5 and 8 of the time interval. The outputs of the former 5 through the serially connected inverter 6 and the coincidence unit (BS) 7 are connected to the inputs of the second BS 9 connected to the alarm activation unit 10. To the second input of the aircraft 7 is connected to the second output of the driver 5. The device m. only a wave propagating along the axis along which the sensitive elements 1 and 2 are located. The direction of its propagation should be from the sensitive element 1 to the sensitive element 2. The detection of waves coming from other directions is blocked by BS 7 and 9. When the initial impact of the interference wave on the element 2 impulses to the BS 9 input will not come at the same time and the signal to activate the alarm will not be generated. 2 Il. interference (C (L ate to SC) GcHE

Description

one

1451282

The invention relates to various areas of human activity related to the detection of aerodynamic phenomena, and can be used, for example, in the automation of processes that ensure the safety of mining operations under hazardous conditions.

The purpose of the invention is to increase the reliability of the detection of wave sources by selecting the waves propagating in the atmosphere of mining in the direction of their propagation.

Figure 1 shows the block diagram of the device; 2 a and b show timing diagrams of the output signals of measuring circuits.

ten

15

LI nization of the measurement circuit and the sensing element 2 of the wave signaling circuit for measuring wave parameters. Moreover, the sensing element 1 is positioned in the direction of the wave source first with respect to the sensing element 2. When the wave element excited by a detectable source is applied to the sensitive element 1, a signal is generated at the output of the sensing element 1, which, propagating through the measuring circuit blocking the signaling, in block 3 signal selection. The signal allocated by block 3 is fed to the shaper of 5 time intervals, on the two outputs of which two pulses are produced (we assume that

The device automatically detects-20 processes of selection of waves according to their parameters. Device aHiuM interface: Mr, viyuy and signaling

The origin of the wave source, predominantly in the atmosphere of mine workings, includes (Fig. 1) installed in the presumptive direction of the wave source at a given distance A, the sensing element 1 blocking the signaling circuit, measuring and sensing the element 2 of the signal signaling the compression (or rarefaction) of the circuit from JU. measurement of wave parameters, blocks 3 and 4 of the selection of signals from the waves, shaper 5 time intervals, performed, for example, in the form of two waiting

.1-1m i cji -i 4-s- «.-. -

frames in the blocking and signaling chain occurs instantly). The duration of the first pulse is equal to the duration of the interval t (see Fig. 2a) from the moment of detection of the wave by the measuring circuit blocking the signaling until the moment when the sensitive element 2 triggers a signal on the measuring circuit. The duration of the second pulse is equal to the sum of two intervals: period t; the passage by the wave of the distance A and the time interval from the moment the wave is detected by the signaling circuit to the end of the signal.

For example, in the form of two. .worked by the Shaper of multivibrator time inverters 6 bl to 35 - worked R Р

40

45

a match, also made in the form of a multivibrator, a shaper of 8 time intervals, a block 9 of a match, and a block 10 of switching on the signaling. The sensing element 1, the selection unit 3, the shaper 5 time-intervals, the inverter 6 and the coincidence unit 7 form the measurement circuit blocking signaling, and the sensing element 2, the selection unit 4 and the time interval generator 8 form the measurement circuit signaling a compression wave.

The selection of waves in the direction of their propagation is carried out by this device, for example, in mine workings as follows.

Predicted directions are located in the mine workings of the wave sources. 55 in the estimated direction of the source of the waves at a predetermined distance A from one another sensing element 1 of the blocking signal intervals 8 ... The first pulse through the inverter 6, and the second pulse on the forward link receives the input of the coincidence unit 7. As a result, after a time t equal to the duration of the first pulse, the output of the coincidence unit 7 produces a pulse of duration t arriving at one of the inputs of the coincidence circuit 9. This pulse is used to enable the block 9 to generate a detection signal when a signal arrives at its second input from the driver 8. At an action of the PII of the wave propagating from the sensitive element 1 of the wave to the sensitive element 2, a signal is generated at its output , propagated by a measuring circuit signaling a wave, is compared with the reference from block 4 of wave selection and their parameters. Subsequently, the signal allocated by block 4 enters the time frame of 8 time intervals.

LI nization of the measurement circuit and the sensing element 2 of the wave signaling circuit for measuring wave parameters. Moreover, the sensing element 1 is positioned in the direction of the wave source first with respect to the sensing element 2. When the wave element excited by a detectable source is applied to the sensitive element 1, a signal is generated at the output of the sensing element 1, which, propagating through the measuring circuit blocking the signaling, in block 3 signal selection. The signal allocated by block 3 is fed to the shaper of 5 time intervals, on the two outputs of which two pulses are produced (we assume that

the processes of selection of waves according to their parameters: mr, vyyuy and signaling

the processes of selection of waves according to their parameters: mr, vyyuy and signaling

.1-1m i cji -i 4-s- «.-. -

frames in the blocking and signaling chain occurs instantly). The duration of the first pulse is equal to the duration of the interval t (see Fig. 2a) from the moment of detection of the wave by the measuring circuit blocking the signaling until the moment when the sensitive element 2 triggers a signal on the measuring circuit. The duration of the second pulse is equal to the sum of two intervals: period t; the passage by the wave of the distance A and the time interval from the moment the wave is detected by the signaling circuit to the end of the signal.

.worked by the Shaper of times - worked Р Р

worked by the Shaper of times - 5 - worked Р Р

0

45

55

intervals of 8 .. The first pulse through the inverter 6, and the second pulse through the direct communication line is fed to the inputs of the coincidence unit 7. As a result, after a time t equal to the duration of the first pulse, the output of the coincidence unit 7 generates a pulse of duration t arriving at one of the inputs of the coincidence circuit 9. This pulse is used to enable the block 9 to generate a detection signal when a signal arrives at its second input from the driver 8. At an action of the PII of the wave propagating from the sensitive element 1 of the wave to the sensitive element 2, a signal is generated at its output , propagated by a measuring circuit signaling a wave, is compared with the reference from block 4 of wave selection by their parameters. Further, the signal allocated by block 4 is fed to the shaper of 8 time intervals.

31А5

at the output of which a pulse of duration t is produced, arriving at the other input of the coincidence unit 9. When signals from block 7 of coincidence arrive at the same time and a driver 8 of the signaling circuit is formed at the input of block 9 of coincidence, a pulse is generated at its output, which turns on the signaling block 10. After the disappearance of these signals at the input of block 9 of coincidence, the device will again be ready to detect waves.

Thus, the device can only detect a wave propagating from along the axis on which the sensitive elements 1 and 2 are located. Moreover, the direction of its propagation must be from the sensing element 1 to the sensing element 2. The detection of all other waves coming from other directions is blocked by blocks 7 and 9 of the device coincidence. So, for example, when the wave is initially interfered with the element 2, the pulses will not come to the input of the block 9 simultaneously, and the signal to turn on the alarm will not be generated (see Fig. 26).

Structurally, the proposed solution can be performed as follows. The elements that block the alarm and signal the occurrence of measuring circuits, carry out the selection of waves according to their parameters, can be performed similarly to the elements of the signal measuring circuit of the prototype (when selecting compression waves according to their duration). If found282

The waves will be produced according to their other parameters, for example, the amplitude of the pressure pulse in the wave or the number of maxima in the compression wave, etc. (depending on which source is to be detected) and the design of the sensitive elements and selection circuits for measuring circuits should provide a solution to the problem of selection according to selected parameters of compression waves.

Claims (1)

Invention Formula The device for automatic detection of the source of waves mainly in the atmosphere of mine workings, contains its two sensitive elements, the signal selection unit, the time interval formers, the output of one of which is connected to the input of the inverter, and the coincidence unit, which is In order to improve the reliability of detection of the wave source due to the continuous implementation of the wave selection process in the direction of their propagation, an additional coincidence unit and a signal selection unit were introduced into the device, each sensor element being connected to the inputs of the time interval formers, the output of one of which, and the output of the inverter are connected to the inputs of the additional matching unit, the output of the latter is connected to the first input of the matching unit, the second entrance which is connected to the output of another time interval former. ABOUT f- 11 t about 2i vf fie.2 ii.