JP2004036984A - Electronic primer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent all of functions of an electronic primer from being reset in a case when the temporary electric power failure is generated during priming operation. <P>SOLUTION: In this electronic primer wherein the electric energy supplied from a blasting device or a controller mounted at a remote place, is stored in an energy storage condenser 13, a timer circuit 21 is operated by the stored energy, and the stored energy is discharged after a desired time delay to explode a primer part, a backup circuit 2 makes compensation in a case when the temporary electric power failure is generated in the energy storage condenser 13. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electronic detonator, and more particularly, to an electronic detonator used in a blasting operation in which a plurality of explosives are charged on an object to be destroyed (for example, a rock or a building), and these are remotely supplied or controlled, and sequentially fired. About.
[0002]
[Prior art]
Conventionally, electric energy supplied from a blaster or a controller disposed at a remote position is stored in an energy storage circuit which is a power supply circuit, a timer circuit is operated by the stored energy, and an operation of the timer circuit is controlled. Electronic detonators are known which eventually detonate after a desired delay time.
[0003]
Recently, a mechanism for measuring the delay time of the timer circuit includes a technology that includes an oscillation circuit that generates and outputs a clock pulse serving as a clock reference, and a counter circuit that counts the clock pulse and generates a trigger signal. Is the mainstream.
[0004]
These electronic detonators are provided with a reset state of the counter circuit as described in JP-A-63-83699, US Pat. No. 4,445,435, and JP-A-5-79797. After a set delay time is measured, there is a reset release control type in which the electric charge (electric energy) charged in the energy storage circuit is discharged to initiate an explosion.
[0005]
Further, a blaster or a controller disposed at a remote position controls the operation of the electronic detonator, such as the electronic detonator in USP 4,674,047, USP 5,460,093, and USP 5,406,890. There is a sequence control type in which a control signal is generated, an electronic detonator receives a control signal from the controller, and is controlled by a stepwise sequence operation.
[0006]
The sequence operation includes, for example, a timing preparation step of receiving a signal (ARM signal) for preparation for starting explosion timing before starting timing of a desired delay time, such as an electronic detonator disclosed in US Pat. No. 5,460,093. After receiving the explosion timing start signal (FIRE signal), the reset state of the counter circuit is released, the set delay time is counted, and the explosion is initiated.
[0007]
[Problems to be solved by the invention]
The above-mentioned electron detonator is generally used to charge a plurality of explosives to a target to be destroyed (for example, a bedrock or a building), remotely supply or control them, and sequentially detonate them.
[0008]
For this reason, there is a concern that it may be affected by the explosion in the preceding stage, particularly, an electromagnetic wave or a shock wave generated by the explosion.
[0009]
The effects of concern about the electrical system of the timer circuit include fluctuations in the output voltage of the power supply circuit or temporary power failure.
[0010]
The present inventors have experimentally confirmed that when an electrolytic capacitor is used as the power supply circuit, a temporary power failure occurs due to the effect of the explosion at the preceding stage.
[0011]
The temporary blackout phenomenon observed as described above was such that the charged voltage level temporarily dropped to the 0 volt level for about 10 msec to 20 msec, and then recovered rapidly.
[0012]
When the above-described temporary power failure occurs, the electrical system of the timer circuit temporarily stops. Therefore, in the reset release control type electronic detonator, the counter circuit falls into a reset state again and does not occur unless the reset is released. Or if it has a function of canceling the reset spontaneously as disclosed in Japanese Patent Application Laid-Open No. 5-79797, the timer is started again from the end of the temporary power failure, and the scheduled delay time It is detonated late.
[0013]
Further, in the above sequence control type electronic detonator, if the above-mentioned temporary power failure occurs during the detonation operation, all the functions are reset, and a part of the destruction target is destroyed by the previous explosion, Since a lead wire or the like for signal transmission is cut and the sequence control signal cannot be transmitted, a failure occurs without fail.
[0014]
Also, in the case of an electronic detonator of the type that transmits the control signal wirelessly, even if the explosion timing start signal (FIRE signal) is continuously transmitted at least in order to avoid a misfire at least, the temporary power failure occurs. Since the explosion timing start signal (FIRE signal) is received from the end point and the timing is started again, it is inevitable that the detonation will occur later than the scheduled delay time.
[0015]
An object of the present invention is to provide an electronic detonator capable of solving the above problems.
[0016]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides an energy storage means for storing electric energy supplied from a blaster or a blast controller located at a remote position, and a timer means operated by energy from the energy storage means. A backup means for compensating for a temporary power failure of the energy capacitor in an electronic detonator comprising: a detonating means for discharging the stored energy after a desired delay based on the operation of the timer means to detonate the detonating part. An electronic detonator characterized by having:
[0017]
Alternatively, electric energy supplied from a blaster or a controller located at a remote position is stored in an energy storage capacitor, a timer circuit is operated by the stored energy, and after a desired delay time, the stored energy is discharged. In the electronic detonator that detonates the detonator, the delay time determined before the start of the timing is measured, and after the delay time, in the electronic detonator that discharges the stored energy to detonate the detonator, the energy detonation is performed. An electronic detonator having backup means for compensating for a temporary power failure of the capacitor and power failure processing means can also be provided.
[0018]
Alternatively, a DC power supply, a timer circuit is operated by the DC power supply, and after a desired delay time, the electric energy of the DC power supply is applied, and in the electronic detonator that detonates the primer section, the DC power supply is temporarily stopped. An electronic detonator having backup means for compensating for a power failure can also be provided.
[0019]
The concept of a backup circuit for compensating for a temporary power failure of the power supply circuit as described above is described in, for example, JP-A-2001-191892 and JP-A-5-3634.
[0020]
Also, the present invention provides an energy storage means for storing electric energy supplied from a blaster or a blast controller located at a remote position, and the blaster or the blast controller operated by energy from the energy storage means. An electronic circuit for performing timing by a timing start control signal from the electronic control unit, and a detonating unit that performs timing of a delay time determined before the start of the timing, discharges the stored energy after a desired delay, and detonates a primer section. The electronic detonator comprising: a backup means for compensating for a temporary power failure of the energy capacitor; and a power failure processing means for storing an operation stage before the power failure and performing a process after a power failure recovery based on the storage. Provide electronic detonator.
[0021]
Here, the power failure processing means includes: an operation phase storage means for storing the operation phase before the power failure; and a sequential operation means for performing an operation subsequent to the operation phase stored in the operation phase storage means after power is restored. Can have.
[0022]
Note that the concepts of the power failure processing means and the clock means as described above are described in JP-A-7-191780, JP-A-5-108503, JP-A-5-241686, JP-A-5-25157, and JP-A-5-25157. -108503.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
(Embodiment 1)
With reference to FIG. 1, a first embodiment of an electronic detonator according to the present invention will be described.
FIG. 1 is a block diagram showing a circuit configuration of an electronic module 1 of the electronic detonator according to the present embodiment.
[0024]
An input resistor 11 is connected between input terminals 24 and 25 that receive supply of electric energy from a blaster (not shown), and an input terminal of a rectifier circuit 12 is connected in parallel with the input resistor 11.
[0025]
An output terminal of the rectifier circuit 12 is connected to an energy storage capacitor 13 for charging electric energy supplied from the blaster. One end (anode terminal) of the energy storage capacitor 13 is connected to the output terminal 26 and the anode terminal of the backflow prevention diode 15, and one end of the backup capacitor 14 and the input terminal of the constant voltage circuit 16 are connected to the cathode terminal of the backflow prevention diode 15. Is connected.
[0026]
The position of the backup capacitor 14 is preferably arranged on the input side of the constant voltage circuit 16 as described above, and its capacitance may be equal to or less than the capacitance of the energy storage capacitor 13. Can be arbitrarily selected depending on the assumed duration of the temporary power failure. Considering the influence on the regular charging characteristics, the capacitance of the energy storage capacitor 13 is preferably 0.1% to 10%.
[0027]
In addition, from the viewpoint of shock resistance, when the energy storage capacitor 13 is, for example, an aluminum electrolytic capacitor, a temporary power failure may occur due to the shock. Preferably, the capacitor has another structure, for example, a multilayer ceramic capacitor, a film capacitor, or a tantalum capacitor.
[0028]
The constant voltage circuit 16 receives the charging voltage of the energy storage capacitor 13, converts the voltage into an appropriate operating voltage of the timer circuit 21, and stably supplies the voltage to the timer circuit 21.
[0029]
In the electronic detonator of the present invention, the operating voltage of the timer circuit 21 is lower than the charging voltage of the energy storage capacitor 13. Therefore, since the input voltage of the constant voltage circuit 16 is higher than the output voltage, when the same capacitor having the same capacitance is used as the backup capacitor 14, it is better to arrange the capacitor on the input side rather than the output side of the constant voltage circuit 16. More charge can be charged.
[0030]
Although the backflow prevention diode 15 is required in any of the above arrangements, if the backflow prevention diode 15 is arranged on the output side of the constant voltage circuit 16, only the forward voltage drop of the backflow prevention diode 15 will be obtained. The supply voltage to the timer circuit 21 decreases, which is not preferable.
[0031]
Therefore, the arrangement of the backup circuit 2 including the backflow prevention diode 15 and the backup capacitor 14 is preferably on the input side of the constant voltage circuit 16, and a π-type circuit is formed together with the energy storage capacitor 13.
[0032]
That is, the other end (cathode terminal) of the energy storage capacitor 13 and the other end of the backup capacitor 14 are connected to a common (GND) terminal, and are connected in parallel with the backflow prevention diode 15 interposed therebetween.
[0033]
An output terminal of the constant voltage circuit 16 is connected to an output stabilizing capacitor 17 for stabilizing the output voltage of the constant voltage circuit 16, a zener diode 18, the reset holding circuit 3, and a power supply terminal of the timer circuit 21. The reset holding circuit 3 is configured by a series circuit of a reset holding circuit resistor 19 and a capacitor 20, and an input terminal of the timer circuit 21 is connected to a connection point between the reset holding circuit resistor 19 and the capacitor 20.
[0034]
The ignition resistance wire 23 is connected between the output terminals 26 and 27, and the anode terminal of the SCR 22 is connected to the output terminal 27. The cathode terminal of the SCR 22 is connected to a common (GND) terminal, and the gate terminal is connected to the output terminal of the timer circuit 21.
[0035]
The basic operation of the electronic module 1 is to charge the energy storage capacitor 13 when electric energy is supplied from the blaster, and to operate once based on the charging voltage of the energy storage capacitor 13 once charged.
[0036]
The charging voltage is regulated to a constant value by the constant voltage circuit 16, for example, 3.0 (V), and supplied to the output side. The stabilized output voltage is supplied to the timer circuit 21 and the reset holding circuit 3.
[0037]
The timer circuit 21 includes, for example, a crystal oscillation circuit (not shown) and a counter (not shown) for counting output pulses of the crystal oscillation circuit. When the counter counts output pulses by a preset count value, it outputs a trigger signal from an output terminal to turn on the SCR 22 and discharge the charge of the energy storage capacitor 13 to the ignition resistance wire 23.
[0038]
The ignition resistance wire 23 is heated when it receives a discharge of electric charge (electric energy) equal to or more than a predetermined value, thereby detonating an attached electric detonator (not shown).
[0039]
The reset holding circuit 3 delays the start of the counting operation by the counter by a time corresponding to a time constant determined by the reset holding circuit resistor 19 and the capacitor 20 until the output of the crystal oscillation circuit is stabilized. Cancel the reset.
[0040]
The backup circuit 2 including the backup capacitor 14 and the backflow prevention diode 15 is, for example, a device in which the voltage level of the energy storage capacitor 13 once charged to the 0 volt level by the external factor or the internal factor is about 10 msec to 20 msec. In the event that a temporary power failure occurs, such as a short period of time and then a rapid recovery, the operation is performed so as to cover the operating energy with the electric charge charged in the backup capacitor 14 only during that period.
[0041]
That is, even when a temporary power failure occurs, the operation is performed to prevent the voltage drop of the timer circuit 21 and to prohibit the reset operation again.
[0042]
Therefore, the design time for the descent of the energy storage capacitor 13 can be set by the capacitance of the backup capacitor 14, and is not limited to the above-mentioned time (about 10 msec to 20 msec).
[0043]
In the example of the present embodiment, an aluminum electrolytic capacitor (1,000 (μF) / rated voltage 16 (V)) is used as the energy storage capacitor 13, and a multilayer ceramic capacitor (1 (μF) / GRM40B105K16) is used as the backup capacitor 14: Murata Manufacturing Co., Ltd.) was used.
[0044]
The Zener diode 18 suppresses the overshoot of the constant voltage circuit 16 when the charging voltage of the energy storage capacitor 13 recovers steeply when the above-described temporary power failure occurs, and an unnecessary voltage increase that adversely affects the timer circuit 21. (Surge voltage).
[0045]
In this embodiment, the Zener diode 18 has a Zener voltage of 5.6 (V) and a current consumption of 1 (μA) or less with respect to the output voltage of 3.0 (V) of the constant voltage circuit 16 (HZU5.6G: Hitachi, Ltd.) was used.
[0046]
(Embodiment 2)
Embodiment 2 An electronic detonator according to Embodiment 2 of the present invention will be described with reference to FIG.
FIG. 2 is a block diagram illustrating a circuit configuration of the electronic module 101 of the electronic detonator according to the present embodiment.
[0047]
An input resistor 11 is connected between input terminals 24 and 25 that receive supply of electric energy from a blaster (not shown), and an input terminal of a rectifier circuit 12 is connected in parallel with the input resistor 11.
[0048]
One output terminal of the rectifier circuit 12 is connected to an anode terminal of the control signal separating diode 28 and a control signal input terminal of the timer circuit 102. The control signal input from the input terminals 24 and 25 via the rectifier circuit 12 is input from one output terminal of the rectifier circuit 12 to the control signal input terminal (SIGNAL-1). One end (anode terminal) of the energy storage capacitor 13 for charging the electric energy supplied from the blaster is connected to the cathode terminal of the control signal separating diode 28.
[0049]
The resistor 29 and the source terminal of the FET 30 are connected to the anode terminal of the control signal separating diode 28, that is, the output (+) terminal of the rectifier circuit 12. The resistor 29 is for preventing floating and prevents instability of the control signal.
[0050]
The drain terminal of the FET 30 is connected to a common (GND) terminal via a resistor 31, and the gate terminal is connected to a signal return terminal of the timer circuit 102. The FET 30 closes when it receives a reply high-level signal from the signal return terminal of the timer circuit 102, and changes the potential between the input terminals 24 and 25 or the current consumption by bypassing the current from the rectifier circuit 12. This change is transmitted to the blast controller as return information from the timer circuit 102.
[0051]
One end (anode terminal) of the energy storage capacitor 13 is connected to the output terminal 26 and the anode terminal of the backflow prevention diode 15, and one end of the backup capacitor 14 and the input terminal of the constant voltage circuit 16 are connected to the cathode terminal of the backflow prevention diode 15. Is connected.
[0052]
The backup circuit 2 including the backflow prevention diode 15 and the backup capacitor 14 is arranged on the input side of the constant voltage circuit 16 for the reason described in the first embodiment, and forms a π-type circuit together with the energy storage capacitor 13.
[0053]
That is, the other end (cathode terminal) of the energy storage capacitor 13 and the other end of the backup capacitor 14 are connected to a common (GND) terminal, and are connected in parallel with the backflow prevention diode 15 interposed therebetween.
[0054]
Further, the capacitance of the backup capacitor 14 may be equal to or smaller than the capacitance of the energy storage capacitor 13 as in the first embodiment, and may be arbitrarily selected depending on the assumed duration of the temporary power failure. can do. Considering the influence on the regular charging characteristics, the capacitance of the energy storage capacitor 13 is preferably 0.1% to 10%.
[0055]
Further, as for the structure of the backup capacitor 14, it is preferable to use a structure having more excellent impact resistance as in the first embodiment. For example, a multilayer ceramic capacitor, a film capacitor, or a tantalum capacitor can be used. .
[0056]
An output terminal of the constant voltage circuit 16 is connected to an output stabilizing capacitor 17 for stabilizing an output voltage of the constant voltage circuit 16, a zener diode 18, a reset time constant circuit 4, and a power supply terminal of the timer circuit 102. . The reset time constant circuit 4 is configured by a series circuit of a reset holding circuit resistor 19 and a capacitor 20, and a reset terminal (RESET) of a timer circuit 102 is connected to a connection point between the reset holding circuit resistor 19 and the capacitor 20. You.
[0057]
The ignition resistance wire 23 is connected between the output terminals 26 and 27, and the anode terminal of the SCR 22 is connected to the output terminal 27. The cathode terminal of the SCR 22 is connected to a common (GND) terminal, and the gate terminal is connected to the output terminal (OUT) of the timer circuit 102.
[0058]
The configuration of the timer circuit 102 will be described with reference to FIG.
FIG. 3 is a block diagram showing an arrangement of main components of the timer circuit 102.
[0059]
The timer circuit 102 includes a central control circuit 200, a reset holding comparator 201, a voltage dividing resistor circuit 202, a control signal decoder 203, a return decoder 204, a clock pulse generating circuit 205 including, for example, a crystal oscillation circuit and an RC oscillation circuit, a control state. It comprises a storage circuit 206, a first counter 207, a second counter 208, and a preset circuit 209.
[0060]
The reset holding comparator 201 receives the reset signal from the reset time constant circuit 4, compares the reset signal with a reference voltage generated by the voltage dividing resistor circuit 202, and resets when the reset signal voltage exceeds the reference voltage. Generate a release signal. The control signal decoder 203 decodes a signal input from the control signal input terminal (SIGNAL-1) and transmits the signal to the central control circuit 200. The reply decoder 204 outputs the signal output by the central control circuit 200 as a reply signal from the output terminal (SIGNAL-2).
[0061]
The first counter 207 counts the clock pulses from the clock pulse generation circuit 205 corresponding to the first clocking time (dT1) after the reset is released by the central control circuit 200, and outputs a first clocking end signal. The second counter 208 is reset after receiving the first clock end signal of the first counter 207, and the clock pulse from the clock pulse generation circuit 205 corresponding to the second clock time (dT 2) set in the preset circuit 209. Is counted, and a second timing end signal is output from the output terminal (OUT).
[0062]
The control state storage circuit 206 is controlled by the central control circuit 200, and stores the operation state during the first clock time (dT1). The control state storage circuit 206 is composed of a non-volatile memory circuit such as an EEPROM, for example, and includes the state of the operation sequence of the central control circuit 200, the counted value of the second counter 208, and an electronic detonator used for blasting work described later. The identification number code allocated to each of the plurality of and the count value of the second counter programmed in advance are stored.
[0063]
The operation of the electronic detonator according to the second embodiment will be described with reference to FIGS.
FIG. 4 is a flowchart showing the flow of the basic operation of the electronic detonator in the second embodiment.
[0064]
The electric energy supplied from the blast controller is charged in the energy storage capacitor 13 (S402). The charging voltage is regulated to a constant value by the constant voltage circuit 16, for example, 3.0 (V), and supplied to the output side. The stabilized output voltage is supplied to the timer circuit 102 and the reset time constant circuit 4.
[0065]
When the signal voltage from the reset time constant circuit 4 is input to the timer circuit 102, the internal reset holding comparator 201 is inverted, the central control circuit 200 is reset, and the timer circuit 102 starts operating (S406). At this time, the clock pulse generation circuit 205 has already started operation (S404).
[0066]
Next, the central control circuit 200 confirms the control state stored in the control state storage circuit 206 (S408). In step S410, when it is detected that the control state has entered a later-described second control (ignition; FIRE) state, the process jumps to a later-described second control state, and the first counter 207 starts a counting operation. . On the other hand, if it is detected in step S410 that the state is not the second control (ignition; FIRE) state, the state is a state of waiting for a control signal from the blast controller. This state is called an initial state.
[0067]
A first control (ready; READY) signal is input to each of the plurality of electronic detonators used in the blasting operation by adding the identification number code allocated by the blast controller to each of the plurality of electronic detonators (S412). In response to the first control signal, the central control circuit 200 starts synchronizing with the control signal (S414). When the synchronization is established, the central control circuit 200 adds the identification number code assigned to the electronic detonator and generates a ready (STANDBY) signal. A reply is sent (S420). By the above operation, the connection state of each electronic detonator to the entire system can be confirmed.
The above state is referred to as a first state.
[0068]
The control operation in the first state is sequentially performed on all the intended number of electronic detonators in the order of the identification number code. In the control in the first state, control (S416, S418) for programming the detonation delay time of each electronic detonator may be added. The result of the programming is stored in the control state storage circuit 206.
[0069]
The blast controller repeatedly executes steps S412 to S420 to receive a ready (STANDBY) signal from all the electronic detonators (YES in S422), and then simultaneously performs the second control (ignition; FIRE) signal is output (S424).
[0070]
After receiving the second control (ignition; FIRE) signal, the central control circuit 200 sets the detonation delay time of each electronic detonator stored in the control state storage circuit 206 in the preset circuit 209 (S428). The central control circuit 200 also starts the timing operation of the first timing time dT1 prior to step S428, and counts the predetermined time (dT1) common to all the electronic detonators while performing the second control (ignition; Control is performed so that the entry into the FIRE) state is stored in the control state storage circuit 206 (S430). The first clock time (dT1) is a time required for writing to the control state storage circuit 206, for example, a time required for writing to the EEPROM (50 msec).
The above state is called a second state.
[0071]
Subsequently, a timing operation of the second timing time dT2 is started (S432). That is, the second counter 208 is reset after receiving the first timing end signal of the first counter 207, starts counting output pulses of the clock pulse generation circuit 205, and corresponds to the delay time set in the preset circuit 209. Count the number of pulses. Thereafter, a trigger signal is output to the SCR 22 to turn on the SCR 22 (S434), and the charge stored in the energy storage capacitor 13 is discharged to the ignition resistance wire 23.
[0072]
The ignition resistance wire 23 is heated when it receives a discharge of electric charge (electric energy) of a predetermined value or more, and detonates an attached electronic detonator (not shown).
The state leading up to the detonation is called a third state.
[0073]
If the voltage of the energy storage capacitor 13 drops momentarily due to an abnormal state such as an impact after entering the third state, for example, the central control circuit 200 monitors the voltage of the energy storage capacitor 13. An abnormal state can be detected by the voltage.
[0074]
When the abnormal state is detected, the central control circuit 200 detects the count state of the second counter 208 and starts the operation of storing the remaining count value in the control state storage circuit 206. The time required for this storage operation is substantially the first time measurement time (dT1).
[0075]
Further, when the abnormal state cannot be compensated for even by the change in the charge of the backup capacitor 14, the voltage of the energy storage capacitor 13 returns to the initial state. In this case, in the initial state, the central control circuit 200 checks the control state stored in the control state storage circuit 206 and detects that this control state has entered the second control (ignition; FIRE) state. Therefore, when the first counter 207 starts the counting operation and enters the abnormal state, the remaining count value stored by the voltage of the energy storage capacitor 13 is set in the preset circuit 209, and the remaining state in the third state is set. Operate to continue operation.
[0076]
As described above, in the present embodiment, in the case where the operation before the power failure is performing the clocking operation of the desired delay time width (dT1 + dT2), the operation stage is stored during the first time width dT1, and the operation stage is stored after dT1. The time width dt1 from the start of timing of the settable second time width dT2 to the occurrence of a power failure is captured, and the remaining time width dt2 obtained by subtracting the time width dt1 from the time width dT2 is stored. Then, after the power is restored, the stored operation stage is detected, and the operation is performed so as to measure the remaining time width dt2, thereby compensating at least a time sufficient to store the time width dt2 and temporarily storing the energy storage capacitor 13. Backup can be provided.
[0077]
【Example】
Samples A and B equipped with the functions described in Embodiments 1 and 2 and Sample C not equipped were compared by performing an explosion shock application experiment in sand.
[0078]
In the experiment, the donor explosive and the above experimental sample were suspended at a predetermined distance at a depth of 1 m, the donor explosive was exploded, and the behavior of each experimental sample when an explosion impact was applied to the experimental sample was observed.
[0079]
As a donor explosive, 100 g of slurry explosive (slurry blasting agent) was used. In addition, the distance between the donor explosive and the experimental sample was set to 10 cm, 15 cm, and 20 cm, and comparative experiments were performed under each condition.
[0080]
The experimental results were as shown in FIG.
As is clear from FIG. 4, in the samples A and B equipped with the functions described in the first and second embodiments, although the instantaneous blackout phenomenon of the voltage of the energy storage capacitor 13 was observed at the distances of 10 cm and 15 cm, The detonation was completed with a normal delay time. At a distance of 25 cm, the instantaneous power failure phenomenon itself was not observed.
[0081]
On the other hand, in the sample C not equipped with the function of the present invention, when a momentary power failure phenomenon of the voltage of the energy storage capacitor 13 is observed, the sample C is exploded with a delay time approximately twice as long as the set delay time, and the difference in the behavior is observed. Could be experimentally confirmed.
[0082]
(Effects of the embodiment)
According to the electronic detonator of the first and second embodiments, the voltage level charged in the energy storage capacitor 13 during the time measurement is temporarily set to the 0 volt level due to the explosion impact at the previous stage or other external or internal factors. Therefore, even when a temporary power failure phenomenon such as a rapid recovery is caused, the operation is performed so as to cover the operating energy by the electric charge charged in the backup capacitor 14, and the timer circuit 102 is reset. Instead, the predetermined operation can be completed.
[0083]
In the reset release control type electronic detonator, even if the backup circuit 2 encounters a state where the energy cannot be completely assisted, for example, when the energy storage capacitor 13 continues to be lowered for a longer time than a design value, the energy storage capacitor 13 can be used. By taking a sufficient energy margin, the counter is reset again and the delay time is re-timed, so that at least a failure of the electronic detonator does not occur, but in the above sequence control type electronic detonator, In particular, when all the operations of the timer circuit 102 of some of the electronic detonators are reset after entering the second control (ignition; FIRE) state described in the second embodiment of the electronic detonator of the present invention, the second control (ignition; FIRE) is performed. ) Since the signal cannot be retransmitted, the basic operation is stopped halfway and a failure occurs without fail.
[0084]
According to the electronic detonator of the second embodiment, the control state stored in the control state storage circuit 206 as described above after the reset is restored even after the abnormal state cannot be compensated for by the charge of the backup capacitor 14 even after the abnormal state can be compensated. After confirming that the control state has entered a second control (ignition; FIRE) state described later, the remaining operation after falling into the abnormal state can be performed. It is possible to detonate in a time close to the delay time.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a circuit configuration of an electronic detonator according to a first embodiment of the present invention.
FIG. 2 is a block diagram showing a circuit configuration of a second embodiment of the electronic detonator according to the present invention.
FIG. 3 is a block diagram showing an arrangement of main components of a timer circuit in a second embodiment of the electronic detonator according to the present invention.
FIG. 4 is a flowchart showing a flow of a basic operation in a second embodiment of the electronic detonator according to the present invention.
FIG. 5 is an explanatory diagram illustrating experimental results of the electronic detonator according to the present invention.
[Explanation of symbols]
1,101 Electronic module
2 Backup circuit
3 Reset holding circuit
4 Time constant circuit for reset
11 Input resistor
12 Rectifier circuit
13 Energy storage capacitors
14 Backup capacitor
15 Backflow prevention diode
16 Constant voltage circuit
17 Capacitor for output stabilization
18 Zener diode
19 Resistor for reset holding circuit
20 capacitors
21,102 Timer circuit
22 Thyristor (SCR)
23 Resistance wire for ignition
24, 25 input terminals
26, 27 output terminals
28 Control signal separation diode
29 Floating prevention resistor
30 FET
31 resistor
102 Timer circuit
200 Central control circuit
201 Reset holding comparator
202 voltage divider resistor circuit
203 control signal decoder
204 Reply Decoder
205 Clock pulse generation circuit
206 Control state storage circuit
207,208 counter
209 Preset circuit

Claims (4)

Energy storage means for storing electrical energy supplied from a blaster or blast controller located at a remote location;
Timer means that operates on energy from the energy storage means;
Based on the operation of the timer means, and a detonating means for discharging the stored energy after a desired delay to detonate the detonating part,
An electronic detonator comprising backup means for compensating for a temporary power failure of the energy capacitor. Energy storage means for storing electrical energy supplied from a blaster or blast controller located at a remote location;
An electronic circuit that operates by energy from the energy storage means and performs time measurement by a time start control signal from the blaster or the blast controller;
An electronic detonator comprising a detonating means for timing the delay time determined before the start of the timing and discharging the stored energy after a desired delay to detonate the detonating part.
Backup means for compensating for a temporary power failure of the energy capacitor;
A power failure processing means for storing an operation stage before a power failure and performing a process after a power failure recovery based on the stored memory. The electronic detonator according to claim 2,
The power failure processing means has an operation stage storage means for storing the operation phase before the power failure, and a sequential operation means for performing the next operation of the operation phase stored in the operation phase storage means after power is restored. Characterized electronic detonator. The electronic detonator according to claim 1 or 2,
An electronic detonator characterized in that the energy storage means is a DC power supply.

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