EP0066418A2 - Schallbetätigungsstartkreis - Google Patents

Schallbetätigungsstartkreis Download PDF

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Publication number
EP0066418A2
EP0066418A2 EP82302564A EP82302564A EP0066418A2 EP 0066418 A2 EP0066418 A2 EP 0066418A2 EP 82302564 A EP82302564 A EP 82302564A EP 82302564 A EP82302564 A EP 82302564A EP 0066418 A2 EP0066418 A2 EP 0066418A2
Authority
EP
European Patent Office
Prior art keywords
signal
sound
control means
machine
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP82302564A
Other languages
English (en)
French (fr)
Other versions
EP0066418A3 (de
Inventor
Colin Rex Johnson Rowe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BHR Electronic Systems Ltd
Original Assignee
BHR Electronic Systems Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BHR Electronic Systems Ltd filed Critical BHR Electronic Systems Ltd
Publication of EP0066418A2 publication Critical patent/EP0066418A2/de
Publication of EP0066418A3 publication Critical patent/EP0066418A3/de
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/24—Remote control specially adapted for machines for slitting or completely freeing the mineral
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
    • E21F17/18—Special adaptations of signalling or alarm devices
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C23/00—Non-electrical signal transmission systems, e.g. optical systems
    • G08C23/02—Non-electrical signal transmission systems, e.g. optical systems using infrasonic, sonic or ultrasonic waves

Definitions

  • This invention is concerned with a safety start up circuit for use with electrically operated machines and in particular underground coal mining machines.
  • a coal face may extend for more than 250 yards or more and therefore audible warning means have to be provided which extend along the length of the face so that all may be given notice that the machine is to start up.
  • a conveyor will be provided along the length of the face along which a coal-winning machine can travel.
  • One of the objects in the present invention is to provide a control circuit which enables a time delay from the sounding of an audible warning before the start up of a machine.
  • a water warning circuit to be associated with the start up of a coal getting machine.
  • the water jets are provided at specified localities which emit a fine spray of water for a period of time prior to the start up of the machine.
  • the coal miners a continued confined audible and physical (water) warning.
  • the klaxon providing the audible warning is conveniently operated by a water driven motor as detailed hereinafter.
  • Water under pressure issues from water warning jets on to the coal face and the present invention includes the steps of switching on the water jets, the sounding of an audible warning and after a predetermined interval of time the start up of the coal getting machine. It is also a feature of the present invention that the machine is not started unless a predetermined flow of water to the jets has been established. It is possible for a break in a water pipe to occur in which event the water flow would be higher than the predetermined value. In the alternative one or more of the jets may be blocked in which event the water flow would be below the predetermined value
  • electric control means for the operation of an electrical machine particularly a coal getting machine comprising means for detecting sound of a quality within predetermined parameters, and for rejecting sound not within the predetermined parameters, providing an electrical signal consequent upon the detection of the correct sound, means for feeding said signal to a time delay circuit and providing the sound is maintained within the predetermined parameters for a predetermined interval of time, providing a signal to start an electrical machine.
  • a water operated klaxon In the application of the present invention to underground coal mine workings a water operated klaxon is provided and the coal getting machine is operated by firstly turning the water on to the klaxon and thence to -the water warning jets of the coal machine.
  • the klaxon In circuit with the water supply is the klaxon so that sound is emitted from the klaxon.
  • the sound is sensed by a microphone and fed to a amplifier thereafter to a filter in order to ensure that only those frequencies which have previously been determined are passed by the filter. From the filter the sound is then fed to a signal splitter whence the signal is fed to two identical circuits.
  • the signal received by the two identical circuits is firstly analysed to ensure that its amplitude is within given values.
  • the signal is then timed and provided all functions are correct a signal from each circuit is fed to an 'AND' gate.
  • a signal from each circuit is fed to an 'AND' gate.
  • the two identical circuits include circuits which time out for a predetermined interval of time to ensure that the sound is emitted at the given amplitude and predetermined frequencies during the timing out period before a signal is fed to the 'AND' gate. No signal is fed to the 'AND' gate if either the amplitude of the sound is too high or too low or varies during the timing out interval.
  • the rate of flow of water to the spray jets is monitored by the sound emitted from the klaxon.
  • the klaxon consists of a water driven motor having a striker which strikes the face of a metal plate or diaphragm.
  • the frequency of sound emitted is determined by the size and positioning of the metal plate and the amplitude of the sound by the force of the striker on to the metal plate.
  • the frequency of impact of the striker is dependent on the flow of water through the water driven pump.
  • a frequency to voltage device is provided which determines the frequency of impact of the striker and provides a signal in the form of voltage as a result thereof. If the frequency is too high the voltage will be too high and the machine not started.
  • the circuit diagram of Figure 1 has a sound emitting device 1 which conveniently will be a klaxon that is water operated.
  • the sound from the klaxon is sensed by a microphone 2 and the signal from the microphone is fed to a filter circuit 3.
  • the filter circuit ensures that only the predetermined frequencies are passed through in the form of a signal. Should the frequencies of the sound emitted by the klaxon 1 not contain the predetermined frequencies then no signal will emerge from the filter circuit 3.
  • the signal will be passed by the filter circuit 3 to a peak holding circuit 4 (explain please) and thence to a signal splitter 5.
  • the peak holding circuit provides a signal for a short period of time at the magnitude of the peak of an applied signal.
  • the peak holding circuit will provide a signal commensurate with the peak of the applied signal for a given period of time until another signal of the same or greater amplitude is applied thereto.
  • the signal from the signal splitter 5 is fed to an amplitude detector 8.
  • the amplitude detector determines that the amplitude of the signal emitted by the klaxon 1 and passed by the filter 3 is of the correct amplitude or is above or below the predetermined values for amplitude.
  • amplitude detector 8a, 8b, and 8c Three outputs are available from the amplitude detector 8a, 8b, and 8c.
  • 8c gives a signal when no signal is received by the detector. In other words this is a signal if the amplitude determined by the amplitude detector is either too low or does not exist. No signal exists at 8c if the amplitude is correct or too high. A signal at 8a is given if the amplitude determined by the amplitude detector is too high. If the amplitude of the signal is within the predetermined values then a signal is provided by the amplitude detector at 8b.
  • the output terminal 8b of the amplitude detector is connected to two timers. One timer 9 designated TTB and the other timer 10 designated TIB.
  • a signal applied to timer 9 triggers the timer and produces a signal at the output of the timer which is then fed to an AND gate 12 which also receives a signal from 8c of the amplitude detector 8 for reasons hereinafter described.
  • timer 9 Once the timer 9 has received a signal from 8b it is triggered and will continue to provide a signal to the AND gate 12 for a predetermined period of time which conveniently is 14 seconds.
  • timer 10 The other signal from 8b is fed to timer 10 TIB and this timer needs a signal to be provided to it all the time for it to continue timing.
  • Providing a signal is continuously fed to timer 10 then after a timed period, for example, 7 seconds timer 10 will provide a signal to timer 11 designated T2B and a signal will be passed through timer 11 to terminal Q of a logic gate 13.
  • Timer 11 will allow that signal to pass through to terminal Q for a predetermined period of time, conveniently 4 seconds providing the correct signal is appearing at the 8b of the amplitude detector 8 and hence is being passed through timer 10.
  • the logic gate 13 permits a passage of signal from terminal Q to terminal S providing no signal is applied at either terminal P connected to the AND gate 12 or terminal R connected to 8a of the amplitude detector 8.
  • the signal which has been timed through timer 10 and timer 11 will be passed through the logic gate 13 to the AND gate 6 for a period determined by timer 11, i.e. 4 seconds.
  • the circuit is powered by a timer 15 connected to a battery so that when the machine is to be operated, the operative has firstly to power the timing out circuit and to do this he presses the button 16. Only when button 16 is pressed will timer 15 operate and connect power to the circuit. This saves battery drain and ensures that the circuit is only powered for the 15/20 seconds, or thereabouts that it is used to determine that the conditions are correct for the start up of the machine.
  • the frequency to voltage converter 14 In place of the peak holding circuit 4 there is a frequency to voltage converter 14 after the filter 3.
  • the purpose of the frequency to voltage converter is to determine the frequency of impact of the striker of the water driven motor of the klaxon onto the plate or diaphragm of the klaxon and only when that frequency of impact is correct will the correct signal in the form of a voltage be passed by correcter 14. If that voltage is too high then it will create a high level abort signal to terminal R of gate 13, and if too low to create a voltage at terminal P of the gate 13.
  • the signal from the timer 11 in the first circuit passes to a gate 17 which then provides a signal to a gate 18 in the form of a power signal.
  • a signal from the timer 11 of the second circuit to gate 18 will itself not result in a signal being passed by 18 until the signal from 17 has powered 18.
  • a signal is passed to a start device 19 which enables an operative then to close a switch 20 for passing power the necessary electrical machine.
  • correct sound as used herein defines the sound which falls within the said predetermined parameters.
  • the present invention is of particular value in ensuring safety in underground mine workings but it will be appreciated that the present invention is applicable to any other machine which it is desired to start or control by a sound emitting device.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Control Of Water Turbines (AREA)
EP82302564A 1981-05-28 1982-05-20 Schallbetätigungsstartkreis Withdrawn EP0066418A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8116359 1981-05-28
GB8116359 1981-05-28

Publications (2)

Publication Number Publication Date
EP0066418A2 true EP0066418A2 (de) 1982-12-08
EP0066418A3 EP0066418A3 (de) 1983-10-12

Family

ID=10522111

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82302564A Withdrawn EP0066418A3 (de) 1981-05-28 1982-05-20 Schallbetätigungsstartkreis

Country Status (3)

Country Link
EP (1) EP0066418A3 (de)
AU (1) AU8408682A (de)
ZA (1) ZA823601B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5090775A (en) * 1989-12-14 1992-02-25 Bochumer Eisenhutte Heintzmann Gmbh & Co. Kg Method of monitoring and controlling mining operations
CN103527248A (zh) * 2013-10-25 2014-01-22 中国矿业大学 基于光纤光栅的煤矿顶板隔水层稳定性监测系统及方法
CN109356655A (zh) * 2018-12-06 2019-02-19 西安科技大学 基于瓦斯浓度和声发射提取指标的复合煤岩动力灾害预测预警方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1387828A (en) * 1971-07-30 1975-03-19 Anderson Mavor Ltd Circuit for a prestart warning system
FR2250453A5 (en) * 1973-11-02 1975-05-30 France Etat Underwater acoustical remote control device - detects the absence of signals on the different frequencies
US4110742A (en) * 1977-07-11 1978-08-29 Hawkins J C Alarm circuit
GB2041601A (en) * 1977-12-14 1980-09-10 Ruppertsberg S Remote control system for the control of electronic apparatus
GB1586036A (en) * 1978-04-12 1981-03-11 Dresser Europe Sa Pre-start warning device for a machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1387828A (en) * 1971-07-30 1975-03-19 Anderson Mavor Ltd Circuit for a prestart warning system
FR2250453A5 (en) * 1973-11-02 1975-05-30 France Etat Underwater acoustical remote control device - detects the absence of signals on the different frequencies
US4110742A (en) * 1977-07-11 1978-08-29 Hawkins J C Alarm circuit
GB2041601A (en) * 1977-12-14 1980-09-10 Ruppertsberg S Remote control system for the control of electronic apparatus
GB1586036A (en) * 1978-04-12 1981-03-11 Dresser Europe Sa Pre-start warning device for a machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5090775A (en) * 1989-12-14 1992-02-25 Bochumer Eisenhutte Heintzmann Gmbh & Co. Kg Method of monitoring and controlling mining operations
CN103527248A (zh) * 2013-10-25 2014-01-22 中国矿业大学 基于光纤光栅的煤矿顶板隔水层稳定性监测系统及方法
CN109356655A (zh) * 2018-12-06 2019-02-19 西安科技大学 基于瓦斯浓度和声发射提取指标的复合煤岩动力灾害预测预警方法

Also Published As

Publication number Publication date
AU8408682A (en) 1982-12-02
ZA823601B (en) 1983-04-27
EP0066418A3 (de) 1983-10-12

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Inventor name: ROWE, COLIN REX JOHNSON