CA1244116A - Blasting initiated control system - Google Patents
Blasting initiated control systemInfo
- Publication number
- CA1244116A CA1244116A CA000507127A CA507127A CA1244116A CA 1244116 A CA1244116 A CA 1244116A CA 000507127 A CA000507127 A CA 000507127A CA 507127 A CA507127 A CA 507127A CA 1244116 A CA1244116 A CA 1244116A
- Authority
- CA
- Canada
- Prior art keywords
- timer
- control system
- blasting
- receiver
- responsive
- 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.)
- Expired
Links
- 238000005422 blasting Methods 0.000 title claims abstract description 28
- 239000000835 fiber Substances 0.000 claims abstract description 11
- 230000003287 optical effect Effects 0.000 claims abstract description 11
- 230000000977 initiatory effect Effects 0.000 claims abstract description 5
- 238000010586 diagram Methods 0.000 description 9
- 238000009423 ventilation Methods 0.000 description 6
- 238000004804 winding Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 2
- 101150087426 Gnal gene Proteins 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000000881 depressing effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
- F42D1/04—Arrangements for ignition
- F42D1/045—Arrangements for electric ignition
- F42D1/05—Electric circuits for blasting
-
- 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
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
-
- G—PHYSICS
- G04—HOROLOGY
- G04G—ELECTRONIC TIME-PIECES
- G04G15/00—Time-pieces comprising means to be operated at preselected times or after preselected time intervals
- G04G15/006—Time-pieces comprising means to be operated at preselected times or after preselected time intervals for operating at a number of different times
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Selective Calling Equipment (AREA)
Abstract
Abstract of the Disclosure:
A blasting initiated control system is disclosed.
The system comprises an optical interface transmitter adapted for connection to a blasting cable, an optical interface receiver, a fiber optic link interconnecting the transmitter and the receiver for transmitting a light beam from the transmitter to the receiver upon energization of the blasting cable, a first timing circuit responsive to the receiver for initiating a certain function at a first predetermined time interval after energization of the blasting cable, and a second timing circuit responsive to the receiver for restoring such function after a second predetermined time interval after energization of the blasting cable.
A blasting initiated control system is disclosed.
The system comprises an optical interface transmitter adapted for connection to a blasting cable, an optical interface receiver, a fiber optic link interconnecting the transmitter and the receiver for transmitting a light beam from the transmitter to the receiver upon energization of the blasting cable, a first timing circuit responsive to the receiver for initiating a certain function at a first predetermined time interval after energization of the blasting cable, and a second timing circuit responsive to the receiver for restoring such function after a second predetermined time interval after energization of the blasting cable.
Description
BLASTING INITIATED CONTROL SYSTEM
This invention relates to a blasting initiated control system and, more particularly to a blasting initiated mine ventilation control system.
After blasting, it is customary for the miners to wait for a few hours before going back to the mining location in order to allow normal ventilation to remove dust from the ambient air. There has been a long need for shortening this waiting period. However, this would require opening of various mine doors and energization of special blowers at a distance from the mining location and thus the running of a special ventilation control cable throughout the mine.
The installation of such a cable is expensive and has not been justified up to now. It haæ also been thought of using the existing blasting cable for initiating ventilation at a predetermined time interval a~ter blasting. However, this has never been done because of the danger of accidentally energizing the blasting cable from the ventilation system in case of maloperation of the ~entilation system.
It is therefore the object of the present invention to provide a safe control system for operating
This invention relates to a blasting initiated control system and, more particularly to a blasting initiated mine ventilation control system.
After blasting, it is customary for the miners to wait for a few hours before going back to the mining location in order to allow normal ventilation to remove dust from the ambient air. There has been a long need for shortening this waiting period. However, this would require opening of various mine doors and energization of special blowers at a distance from the mining location and thus the running of a special ventilation control cable throughout the mine.
The installation of such a cable is expensive and has not been justified up to now. It haæ also been thought of using the existing blasting cable for initiating ventilation at a predetermined time interval a~ter blasting. However, this has never been done because of the danger of accidentally energizing the blasting cable from the ventilation system in case of maloperation of the ~entilation system.
It is therefore the object of the present invention to provide a safe control system for operating
-2-the ventilation equipment from the blasting cable.
The blasting initiated control system, in accordance with the invention, comprises an optical interface transmitter adapted for connection to a blasting cable, an optical interface receiver, a fiber optic link interconnecting the transmitter to the receiver for transmitting a light beam from the transmitter to the receiver upon energization of the blasting cable, a ~irst timing circuit responsive to the receiver for initiating a certain function at a first predetermined time interval after energization of the blasting cable, and a second timing circuit responsive to the receiver for restoring the above mentioned function after a second predetermined time interval.
The first timing circuit preferably comprises a first timer set to time out after such first predetermined time interval, an auxiliary timer responsive to the first timer to momentarily generate an output pulse upon timing out o~ the first timer and a first relay responsive to the auxiliary timer to momentarily initiate the above mentioned function.
The second timing circuit preferably comprises a second timer set to time out after such second predetermined time interval, a second auxiliary timer responsive to the second timer to momentarily generate an output s$gnal upon timing out on the second timer and a second relay responsive to the second auxi~iary timer to momentarily restore the abovs mentioned function and also inhibit operation of the first and second circuits.
The control system further comprises a control circuit including a third relay responsive to a manual switch for enabling the first and second timing circuits and responsive to the second relay for restoring the control system to a stand-by mode. A manual switch may also be provided for operating the third relay to restore the control system to a stand-by mode.
The invention will now be disclosed, by way of example, with reference to the accompanying drawings in which:
Figure 1 is a block diagram of the control system in accordance with the invention;
Figure 2 ls a timing diagram of the control system, Figure 3 is an embodiment of a circuit diagram of the control system in accordance with the present invention.
Referring to Figure 1, there is shown an optical interface transmitter 10 adapted for connection to a blasting cable. Upon application of the blasting signal, the optical interface transmitter generates a light beam which propagates down a fiber optic link 12 to an optical interface receiver 14. The optical interface receiver 14 provides a triggering signal for the time delay control section of the system which includes an "Initiate" timer 16 identified as timer No. 1 and a "Re~tore" timer 18 identified as timer No. 2. Timers No. 1 and No. 2 are triggered simultaneously on the rising edge of the blasting signal as illustrated in the timing diagram shown in Figure 2 of the drawings. Timer No. 1 triggers an auxiliary timer 20 identi~ied as auxiliary timer No. 1 which provides a short pulse which momentarily energizes an output relay 22 identified as output relay No. 1 in the timing diagram of Figure 2. Timer No. 2 similarly triggers an auxiliary timer 24 identified as auxiliary timer No. 2 which provides a short pulse which momentarily energizes an output relay 26 identified as output relay No. 2 in the timing diagram of Figure 2.
Timers No. 1 and No. 2 may be any suitable conventional timers operated in the E mode, such as Models H3CA sold by OMRON, which are provided with pushbuttons on their control panels which may be set by selecting up to three digits and a multiplying factor. A range of 0.1 second to 9990 hours is availablo on such timers. The same type of timers operated in the H mode may be used as auxiliary timers No. 1 and No~ 2. The auxiliary timers are preset to provide a one second pulse which simulates the momentary action of the existing pullcord operated door switches. The pulse widths of the auxiliary timers can be lengthened or shortened, as required, by appropriate selection of their panel settings.
The contacts of output relays 22 and 24 interface with external circuitry (not shown) and may be used for initiating predetermined functions such as operation of blowers and doors after a first predetermined interval and restoring such functions after a second predetermined time interval.
The block diagram of Figure 1 also shows an enable/disable control device 28. This device provides an "enable" signal to timers No~ 1 and No.-2 upon operation o~ an enable pushbutton 30. Such signal is shown in the timing diagram of Figure 2. The manual "enable" signal allows the blasting cable signal to trigger the timers.
The enable/disable control device is normally disabled by the operation of relay No. 2. ~oweYer, the control device may be manually disabled by operating pushbutton 32.
Figure 3 shows an embodiment of a circuit diagram of the control system in accordance with the present invention wherein elements corresponding to those hown in Figure 1 are identified by the same reference characters.
The optical interface transmitter 10 comprises a power supply connected to a conventional fiber optic transmitker. The power supply comprises a trans~ormer T
for stepping down the 220VAC of the blasting cable to 12VAC. The output of the transformer is rectified by diode D1 and smoothened by capacitors Cl and C2, resi~tor Rl and Zener diode Zl. The output of the power supply circuit is appliad to the input terminals of the fiber optic transmitter through resistor R2. The fiber optic transmitter may be any suitable fiber optic transmitter capable of generating a light beam on a fiber optic link upon appearance of a signal at the input thereof. An example of such transmitter is HP1510 made by Hewlett Packard. The light beam transmitt~d over the fiber optic link is received by a suitable receiver, such as Model HP2501 also made by Hewlett Packard. The receiver includes a transistor Ql which is biased into conduction when photoconductor R3 connected in the biaising circuit of the trans~stor is illuminated by the light beam transmitted over the fiber optic link. The output voltage provided by trans~stor Q1 is applied to the start terminals of timers No. 1 and No. 2 o~ the Time Delay Control Section of the system.
The Time Delay Control Section of the system is energized from a llOVAc source which iB applied to Timers No. 1 and No. 2 and to a 12VDC and a 5VDc power supply.
-7~
When the power switrh on the Time Delay Control Section of the system is switched ON, 110V is supplied through normally closed contacts RY3 1 of a relay winding RY3 to a panel light labelled STBY indicating that the system in the Stanby mode. However, triggering of timer~ No. 1 and No. 2 is inhibited until relay RY3, which controls the application of common ground to timers No. 1 and No. 2, is energized. Relay RY3 is energized by depressing ena~le pushbutton 30. Energization of relay RY3 closes contacts RY3-1 to energize a panel light labelled READY indicating that tha system is in the Ready mode and closes normally open contacts RY3-2 to trigger timers No. 1 and No. 2.
Relay RY3 locks itself operated through its own normally open contacts RY3-3. When timer No. 1 has timed out, its outpu~ contacts 16-1 close to trigger auxiliaxy timer No.
1. Auxiliary timer No. 1 momentarily closes its output contacts 20-1 for about one second or so depending on its setting to energize a relay winding KYl, which momentarily closes its normally open contacts RYl-1 to initiata a function such as energization of a fan, closing of a door, etc.
When timer No. 2 ha~ timed out, its output contacts 18-1 close to trigger auxiliary timer No. 2.
Auxiliary timer No. 2 momentarily closes its output contacts 24-1 to energize a relay winding RY2 which momentarily closes its normally open contacts to restore the operation previously performed by relay RYl. In addition, relay RY2 opens normally closed contacts RY2-2 in the energization circuit of relay RY3 to automatically reset the system to a Stanby mode and also in~ibit the triggering of timers No. 1 and No. 2 until the Enable pushbutton is depre~ed again.
Although the invention has been disclo~ed with reference to a preferred embodimenk, it i5 to be understood it is not limited to such embodiment and that other alternatives are also envisaged within the scope of the following claims.
The blasting initiated control system, in accordance with the invention, comprises an optical interface transmitter adapted for connection to a blasting cable, an optical interface receiver, a fiber optic link interconnecting the transmitter to the receiver for transmitting a light beam from the transmitter to the receiver upon energization of the blasting cable, a ~irst timing circuit responsive to the receiver for initiating a certain function at a first predetermined time interval after energization of the blasting cable, and a second timing circuit responsive to the receiver for restoring the above mentioned function after a second predetermined time interval.
The first timing circuit preferably comprises a first timer set to time out after such first predetermined time interval, an auxiliary timer responsive to the first timer to momentarily generate an output pulse upon timing out o~ the first timer and a first relay responsive to the auxiliary timer to momentarily initiate the above mentioned function.
The second timing circuit preferably comprises a second timer set to time out after such second predetermined time interval, a second auxiliary timer responsive to the second timer to momentarily generate an output s$gnal upon timing out on the second timer and a second relay responsive to the second auxi~iary timer to momentarily restore the abovs mentioned function and also inhibit operation of the first and second circuits.
The control system further comprises a control circuit including a third relay responsive to a manual switch for enabling the first and second timing circuits and responsive to the second relay for restoring the control system to a stand-by mode. A manual switch may also be provided for operating the third relay to restore the control system to a stand-by mode.
The invention will now be disclosed, by way of example, with reference to the accompanying drawings in which:
Figure 1 is a block diagram of the control system in accordance with the invention;
Figure 2 ls a timing diagram of the control system, Figure 3 is an embodiment of a circuit diagram of the control system in accordance with the present invention.
Referring to Figure 1, there is shown an optical interface transmitter 10 adapted for connection to a blasting cable. Upon application of the blasting signal, the optical interface transmitter generates a light beam which propagates down a fiber optic link 12 to an optical interface receiver 14. The optical interface receiver 14 provides a triggering signal for the time delay control section of the system which includes an "Initiate" timer 16 identified as timer No. 1 and a "Re~tore" timer 18 identified as timer No. 2. Timers No. 1 and No. 2 are triggered simultaneously on the rising edge of the blasting signal as illustrated in the timing diagram shown in Figure 2 of the drawings. Timer No. 1 triggers an auxiliary timer 20 identi~ied as auxiliary timer No. 1 which provides a short pulse which momentarily energizes an output relay 22 identified as output relay No. 1 in the timing diagram of Figure 2. Timer No. 2 similarly triggers an auxiliary timer 24 identified as auxiliary timer No. 2 which provides a short pulse which momentarily energizes an output relay 26 identified as output relay No. 2 in the timing diagram of Figure 2.
Timers No. 1 and No. 2 may be any suitable conventional timers operated in the E mode, such as Models H3CA sold by OMRON, which are provided with pushbuttons on their control panels which may be set by selecting up to three digits and a multiplying factor. A range of 0.1 second to 9990 hours is availablo on such timers. The same type of timers operated in the H mode may be used as auxiliary timers No. 1 and No~ 2. The auxiliary timers are preset to provide a one second pulse which simulates the momentary action of the existing pullcord operated door switches. The pulse widths of the auxiliary timers can be lengthened or shortened, as required, by appropriate selection of their panel settings.
The contacts of output relays 22 and 24 interface with external circuitry (not shown) and may be used for initiating predetermined functions such as operation of blowers and doors after a first predetermined interval and restoring such functions after a second predetermined time interval.
The block diagram of Figure 1 also shows an enable/disable control device 28. This device provides an "enable" signal to timers No~ 1 and No.-2 upon operation o~ an enable pushbutton 30. Such signal is shown in the timing diagram of Figure 2. The manual "enable" signal allows the blasting cable signal to trigger the timers.
The enable/disable control device is normally disabled by the operation of relay No. 2. ~oweYer, the control device may be manually disabled by operating pushbutton 32.
Figure 3 shows an embodiment of a circuit diagram of the control system in accordance with the present invention wherein elements corresponding to those hown in Figure 1 are identified by the same reference characters.
The optical interface transmitter 10 comprises a power supply connected to a conventional fiber optic transmitker. The power supply comprises a trans~ormer T
for stepping down the 220VAC of the blasting cable to 12VAC. The output of the transformer is rectified by diode D1 and smoothened by capacitors Cl and C2, resi~tor Rl and Zener diode Zl. The output of the power supply circuit is appliad to the input terminals of the fiber optic transmitter through resistor R2. The fiber optic transmitter may be any suitable fiber optic transmitter capable of generating a light beam on a fiber optic link upon appearance of a signal at the input thereof. An example of such transmitter is HP1510 made by Hewlett Packard. The light beam transmitt~d over the fiber optic link is received by a suitable receiver, such as Model HP2501 also made by Hewlett Packard. The receiver includes a transistor Ql which is biased into conduction when photoconductor R3 connected in the biaising circuit of the trans~stor is illuminated by the light beam transmitted over the fiber optic link. The output voltage provided by trans~stor Q1 is applied to the start terminals of timers No. 1 and No. 2 o~ the Time Delay Control Section of the system.
The Time Delay Control Section of the system is energized from a llOVAc source which iB applied to Timers No. 1 and No. 2 and to a 12VDC and a 5VDc power supply.
-7~
When the power switrh on the Time Delay Control Section of the system is switched ON, 110V is supplied through normally closed contacts RY3 1 of a relay winding RY3 to a panel light labelled STBY indicating that the system in the Stanby mode. However, triggering of timer~ No. 1 and No. 2 is inhibited until relay RY3, which controls the application of common ground to timers No. 1 and No. 2, is energized. Relay RY3 is energized by depressing ena~le pushbutton 30. Energization of relay RY3 closes contacts RY3-1 to energize a panel light labelled READY indicating that tha system is in the Ready mode and closes normally open contacts RY3-2 to trigger timers No. 1 and No. 2.
Relay RY3 locks itself operated through its own normally open contacts RY3-3. When timer No. 1 has timed out, its outpu~ contacts 16-1 close to trigger auxiliaxy timer No.
1. Auxiliary timer No. 1 momentarily closes its output contacts 20-1 for about one second or so depending on its setting to energize a relay winding KYl, which momentarily closes its normally open contacts RYl-1 to initiata a function such as energization of a fan, closing of a door, etc.
When timer No. 2 ha~ timed out, its output contacts 18-1 close to trigger auxiliary timer No. 2.
Auxiliary timer No. 2 momentarily closes its output contacts 24-1 to energize a relay winding RY2 which momentarily closes its normally open contacts to restore the operation previously performed by relay RYl. In addition, relay RY2 opens normally closed contacts RY2-2 in the energization circuit of relay RY3 to automatically reset the system to a Stanby mode and also in~ibit the triggering of timers No. 1 and No. 2 until the Enable pushbutton is depre~ed again.
Although the invention has been disclo~ed with reference to a preferred embodimenk, it i5 to be understood it is not limited to such embodiment and that other alternatives are also envisaged within the scope of the following claims.
Claims (5)
1. A blasting initiated control system comprising:
a) an optical interface transmitter adapted for connection to a blasting cable;
b) an optical interface receiver;
c) a fiber optic link interconnecting said transmitter and said receiver for transmitting a light beam from said transmitter to said receiver upon energization of the blasting cable;
d) a first timing circuit responsive to said receiver for initiating a certain function at a first predetermined time interval after energization of the blasting cable; and e) a second timing circuit responsive to said receiver for restoring said function after a second predetermined time interval after energization of the blasting cable.
a) an optical interface transmitter adapted for connection to a blasting cable;
b) an optical interface receiver;
c) a fiber optic link interconnecting said transmitter and said receiver for transmitting a light beam from said transmitter to said receiver upon energization of the blasting cable;
d) a first timing circuit responsive to said receiver for initiating a certain function at a first predetermined time interval after energization of the blasting cable; and e) a second timing circuit responsive to said receiver for restoring said function after a second predetermined time interval after energization of the blasting cable.
2. A control system as defined in claim 1, wherein said first timing circuit comprises a first timer set to time out after said first predetermined time interval, an auxiliary timer responsive to said first timer to momentarily generate an output signal upon timing out of the first timer and a first relay responsive to said auxiliary timer to momentarily initiate said function.
3. A control system as defined in claim 2, wherein said second timing circuit comprises a second timer set to time out after said second predetermined time interval, a second auxiliary timer responsive to said second timer to momentarily generate an output signal upon timing out of the second timer and a second relay responsive to said second auxiliary timer to momentarily restore said function and also inhibit operation of said first and second timing circuits.
4. A control system as defined in claim 3, further comprising a control circuit including a third relay responsive to a manual switch for enabling said first and second timing circuits and responsive to said second relay for restoring the control system to a standby mode.
5. A control system as defined in claim 4, further comprising a manual switch for operating said third relay to restore the control system to a standby mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000507127A CA1244116A (en) | 1986-04-21 | 1986-04-21 | Blasting initiated control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000507127A CA1244116A (en) | 1986-04-21 | 1986-04-21 | Blasting initiated control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1244116A true CA1244116A (en) | 1988-11-01 |
Family
ID=4132926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000507127A Expired CA1244116A (en) | 1986-04-21 | 1986-04-21 | Blasting initiated control system |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1244116A (en) |
-
1986
- 1986-04-21 CA CA000507127A patent/CA1244116A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |