JPH04169800A - Blasting device for electronic delay electronic detonator - Google Patents

Abstract

PURPOSE:To always apply a voltage of a predetermined range to each electric detonator by automatically counting the number of electronic type delay electric detonators, storing it, counting the number of possible blastings, and controlling the charging voltage of a blasting capacitor so as to become equal to the number of charges. CONSTITUTION:A digital value of the number of possible blastings is sequentially displayed by number on a number-of-possible blastings display unit 45, compared with a digital value of the number of charges from a latch circuit 31 by a comparator 46, and supplied to a DC/DC converter 13. If the number of the possible blastings is smaller than the number of the charges, it is quickly charged, and when it becomes the same, and it is gradually charged, a charge complete lamp 47 is lit. If the number of the possible blastings becomes equal to or larger than the number of the charges, the converter 13 is controlled at a three stages through a gate 35 so as to cut OFF the operation signal to the converter 13. Further, if the charged voltage f a blasting capacitor 36 is lowered so that the number of the possible blastings becomes smaller than the number of the charges, the above operation is repeated, and it is always controlled that the number of the possible blastings becomes equal to the number of the charges of the circuit 31.

Description

Detailed Description of the Invention "Industrial Application Field" The present invention relates to a blaster for blasting a plurality of electronic delay electric detonators connected in series, and particularly to a blaster for blasting a plurality of electronic delay electric detonators connected in series, and particularly to a blaster for detonating a plurality of electronic delay electric detonators. The aim is to increase accuracy and ensure that all the bombs are detonated.

``Prior art'' The electronic delay electric detonator referred to in the knee was published in Japanese Patent Application Laid-open No. 54-434.
As is known from Japanese Patent Laid-open No. 54, Japanese Patent Application Laid-open No. 57-142498, and Japanese Patent Laid-open No. 58-83200, a capacitor for storing ignition energy, an electronic delay circuit, and a switching element are included in the case. It is an electric detonator that is equipped with an electronic circuit that makes it possible to delay the ignition time.
The charge stored in the ignition energy storage capacitor is
After a delay time determined by an electronic delay circuit, a discharge is made through the switch element to the ignition resistance wire of the electric detonator, thereby heating the ignition resistance wire and detonating the detonator.

The conventional electronic delay electric detonator blaster was developed in Japanese Patent Application Laid-Open No. 60-2
As known from Publication No. 21700, there is a charging circuit that charges a blasting capacitor with blasting energy, a capacitor voltage divider circuit that divides the voltage charged in the blasting capacitor, and a divider of the capacitor voltage divider circuit. It consists of a changeover switch that switches the pressure point and connects it to the output terminal, and the changeover switch changes according to the number of connected delay electric detonators so that the electrical energy required for the delay electric detonators of the blasting circuit can be supplied during blasting. Switch. A discharge resistor is connected in parallel with each dividing capacitor of the capacitor voltage dividing circuit.

In other words, the energy charged in the blasting capacitor is divided and outputted by a capacitor voltage divider circuit, and by switching the output number setting changeover switch, depending on the number of electronic delay electric detonators connected to the output terminal, Only the energy necessary for detonation was output, and the excess energy was dissipated through a discharge resistor.

``Problem to be Solved by the Invention'' In an electronic delay electric detonator, a voltage range is set to be applied to the ignition energy storage capacitor, and when a voltage exceeding this voltage range is applied, the set delay time is obtained. There is a risk of malfunction if the value is not reached, and there is a risk of a misfire if the value is lower than that.

When detonating an electronic delay electric detonator using a conventional electronic delay electric detonator, there are the following problems.

In order to improve the delay time accuracy of electronic delay electric detonators,
It is necessary to reduce the setting range of the voltage applied to the ignition energy storage capacitor and apply a voltage within this range. In order to make this possible with conventional electronic delay electric detonators, it is necessary to increase the number of voltage divisions in the capacitor voltage divider circuit and apply the voltage charged in the blasting capacitor to each electronic delay electric detonator. It is necessary to be able to divide the voltage within the voltage setting accuracy range.

Therefore, as the number of electronic delay electric detonators to which blasting voltage is applied increases, the number of required voltage dividers of the capacitor voltage divider circuit increases accordingly.

If a capacitor voltage divider circuit with a large number of voltage divisions is included in the oscillator, the structure becomes large, and if the capacitor voltage divider circuit is provided as an external circuit and connected by an adapter, handling becomes difficult.

Furthermore, since the changeover switch of the capacitor voltage divider circuit is manually operated, the output voltage may not be the desired value due to incorrect operation, and there is a risk that the electronic delay electric detonator may malfunction or fail to explode.

The purpose of the present invention is to automatically apply a voltage in the optimum range to each detonator in the blasting of a plurality of electronic delay electric detonators connected in series, to improve delay time accuracy, and to eliminate the risk of misdetonation. Another object of the present invention is to provide a blaster for an electronic delay electric detonator that is easy to handle at a blasting site and is lightweight and compact.

"Means for Solving the Problems" In order to solve these problems, this invention uses a low-voltage battery as a power source, obtains high voltage with a DC/DC converter, and charges a blasting capacitor. means for measuring the number of connected electronic delay electric detonators to be blasted in the device and storing the measured number as the number of blasting loads;
Means for measuring the voltage charged in the blasting capacitor by the C/DC converter as the number of blasts that can be blasted, and means for controlling the charging voltage of the blasting capacitor so that the number of blasts that can be blasted is equal to the number of blasting loads. We are prepared.

Regarding the means for measuring the number of connected electronic delay electric detonators to be blasted and storing this measured number as the number of blasting loads,
For example, a blaster has a constant current source inside, and a constant minute 1i current that is extremely safe against blasting current is sent from the output terminal to electronic delay electric detonators connected in series for blasting. The number of connections is counted by capturing the voltage drop due to the input resistance as an analog value and setting the conversion rate in the process of converting this into a digital value, and this is stored in an electronic memory as the number of blast loads.

As for the means to measure the voltage charged in the blasting capacitor by the DC/DC converter as the number of blasts that can be blasted, for example, in the same way as the loaded number counter, divide the charging voltage of the DC/DC converter and convert it into an analog value. captured as
By setting the conversion rate in the process of converting this into a digital value, the number of electronic delay electric detonators that can be normally detonated is counted.

As for the means for controlling the charging voltage of the blasting capacitor so that the number of blasting loads and the number of blasts that can be blasted are equal, for example, the stored value of the number of blasting loads and the measured value of the number of blasts that can be blasted are compared, and until the two become equal. It has a comparator circuit with a switch that can charge the blasting capacitor and stop charging when the blasting capacitor is equalized. Furthermore, this comparison circuit has a function to restart charging when the charging voltage decreases due to natural discharge of the blasting capacitor.

"Function" According to this configuration, the number of connected electronic delay electric detonators to be blasted is measured, this is stored as the number of blasting charges, and the blasting output voltage corresponding to this stored value is automatically set. Human errors in making these settings can be prevented, and a highly accurate blasting voltage output can be obtained, contributing to improving the delay time accuracy of electronic delay electric detonators and eliminating unexploded detonators. Furthermore, by displaying the measured number of blasting loads, it is possible to determine whether there is an abnormality in the connection circuit of the electronic delay electric detonator.

Embodiment FIG. 1 shows an embodiment of the present invention, and its configuration will be explained below while explaining its operation. When the control power switch 11 is turned on, the low voltage battery 12 is connected to the power supply terminals of each section other than the DC/DC converter 13, and each section becomes operable.

As this low voltage battery 12, for example, four UM-1 alkaline dry batteries are used in series. In addition to this low voltage battery, manganese dry batteries with low internal resistance can also be used.

Furthermore, a low voltage battery 12 is connected to the terminal 14 .

The means for measuring the number of connected electronic delay electric detonators 17 connected between the blasting output terminals 15 and 16 and storing the measured number as the loaded number is to turn on the control power switch 11 and turn on the loaded number measuring switch. It is configured to operate by inputting 18. In other words, when the loaded number measuring switch 18 is turned on, the switch section 18a turns on the D C
/DC converter 13 and blasting output terminal 15 are disconnected, one end of constant current power supply 19 and fixed contact a of selector switch 21 are connected to blasting output terminal 15 at switch section 18b, and terminal]4 is connected at switch section 18c. And Sui...
The child control unit 22 is connected. The other end of the constant current power supply 19 is connected to the positive side of the low voltage battery 12. As a result, the switch control section 22 controls the changeover switches 21 and 23.
are both switched to the fixed contact a side, and the switch 24 is turned on.

As a result, as shown in FIG. 2, the blasting output terminal 15 is connected to one input side of the A/D converter 25 through the switch section 18b and the contact a side of the changeover switch 21, and the output terminal of the source 26 is switched as the reference. It is connected to the other input side of the A/D converter 25 through the contact a side of the switch 23, and is in a state of waiting for the loading number setting switch 27 to be turned on.

In this state, the constant current power supply 19 supplies a constant minute current i that is extremely safe against blasting current to the switch section 18b1 and the blasting output terminal 15. ]6 to an electronic delay electric detonator 17. Each electronic delay electric detonator 1
Inside 7, there is an ignition energy storage capacitor 28 connected between both ends of the blasting bus, and a capacitor 28 connected in parallel with the capacitor 28 in order to bypass leakage current from a nearby electric machine such as a bulldozer entering the detonator. A connected bypass resistor 29 is provided, and a capacitor 28 is further connected to the connection point between the resistor 29 and the blasting bus through a diode F2O.
When the diode 30 is inserted in the forward direction to the power source of the blaster so as to be connected to one end, and the minute current i is passed, the junction barrier of the diode 30 causes the diode 3 to
o is not conductive. Therefore, a current i flows through a circuit in which the bypass resistors 29 of each electronic delay electric detonator 17 are connected in series.

As a result, the following voltage amount V is produced between terminals 15 and 16.

v = i
) is given in 2.

R-(nxZ)+r (2)(2
), n is the number of connected electronic delay electric detonators 17, Z is the input resistance per electronic delay electric detonator 17 (including the leg wire resistance, but mainly the resistance value of the resistor 29), r
indicates the resistance value of the blasting busbar.

For example, the input resistance Z is 100Ω, whereas the blasting bus resistance r is usually 10Ω or less, which is very small and can be ignored.

The A/D converter 25 inputs the voltage drop V caused by equation (1) as an analog value, compares it with the reference voltage V given by the reference power supply 26, and uses this reference voltage as a unit to convert the voltage drop ■ into a digital value. By converting it into a value, it is set to be output as the number of charges in the connected electronic delay electric detonator 17. The comparison expression is (3)
Expressed by the formula.

n= (N/V)Xv (3) (3
), N represents the maximum standard value of the number of connectable electronic delay electric detonators 17, and ■ represents the reference voltage of the reference voltage 'a26.

The loading number n of this electronic delay electric detonator 17 is determined by the latch circuit 3.
1, and when the loading number cent switch 27 is turned on, the flip-flop circuit 32 is inverted, and its output causes the A
The output of the /D converter 25 is launched into the launch circuit 10 (
(stored), and the loading number n is stored as a digital value. The loaded number n is displayed on the display 33. Further, when the loaded number is stored in the latch circuit 31, the loaded number set completion lamp 34 lights up. In addition, the flip-flop circuit 32
The output of the gate 35 opens the gate 35.

In FIG. 1, there is shown a means for measuring the voltage charged in the blasting capacitor 36 by the DC/DC controller 13 as a blastable number, and a means for measuring the voltage charged in the blasting capacitor 36 by the DC/DC controller 13, and a means for measuring the voltage charged in the blasting capacitor 36 by the blasting capacitor 36 so that the loaded number digital value n is equal to the blasting potential digital value.
The means for controlling the charging voltage of No. 6 is activated by turning on the switch 27, opening the loaded number counter switch 18 when the loaded number setting is completed, and then turning on the charging switch 37. That is, when the loaded number counting switch 18 is opened, the switch part 18b is turned off, the fixed contact a of the switch 21 is separated from the blasting output terminal 15, the switch part 18c is turned off, and the switch control part 22 is turned off. When it is separated from the voltage battery 12, the operation of the switch control section 22 is restored, the changeover switches 21 and 23 are switched to the fixed contact side, and the switch 24 is turned off. The charging switch 37 is turned on, the low voltage battery 12 is connected to the DC/DC converter 13, and the DC/DC converter 1 is connected to the DC/DC converter 13.
3 starts operation. Further, in conjunction with the charging switch 37, the switch 3 is turned on, the switch 39 is turned off, and the DC/DC converter 1 is turned on through the switch 38.
The blasting capacitor 36 is charged with the voltage converted to high voltage in step 3. At this time, the blasting output terminal 15 of the blasting capacitor 36 is separated by the switch 39. In this state, a closed circuit shown in FIG. 3 is formed and charging is started.

In this state, the output of the low voltage battery 12 is DC/D
Charging of the blasting capacitor 36 through the C converter 15 is started. This charging voltage is DC/DC
The voltage value is taken out as a voltage value reduced at a constant rate by the dividing resistors 41 and 42 between the output terminals of the converter 13, and is input to the A/D converter 25 through the contacts of the changeover switch 21. In the A/D converter 25, this charge voltage division value is input as an analog value in the same manner as the method for measuring the number of loaded items, and is compared with the reference voltage given by the reference power supply 43 input through the contact of the changeover switch 23. Compare and base! 1! The setting is such that the voltage charged in the blasting capacitor 36 is converted into a digital value and output as the number of electronic delay electric detonators that can be detonated (the number that can be blasted).

This digital value of the number of possible blasts is determined by the A/D converter 25.
Through the latch circuit 44, the blastable number display 45 sequentially displays the number, and the comparator 46 compares the loaded number digital value from the latch circuit 31, and the comparison result is supplied to the DC/DC converter 13. If the number of blasts that can be blasted is smaller than the number of loaded units, charging is performed rapidly, and when the value becomes the same, charging is performed gradually, and the charging completion lamp 47 is lit. When the DC/DC converter 15 becomes the
Controls the DC converter 13. Furthermore, even after charging is completed, if the charging voltage drops due to leakage of the charging voltage of the blasting capacitor 36 and the number of blasts that can be blasted becomes smaller than the number of loads, the above operation is repeated based on the output of the comparator 46, and the number of blasts that can be blasted is always increased. is controlled so that it becomes equal to the number of loads in the launch circuit 31 or +1 (the number of blasts that can be blasted is 1 more).

The means for applying the charge stored in the blasting capacitor 36 as the blasting voltage to the electronic delay electric detonator 17 on the load side through the blasting output terminal 15.16 is activated when the blasting switch 39 is turned on (turned on) in FIG. do. In conjunction with the turning on of the blasting switch 390, the charging switches 37 and 38 are opened, creating a closed circuit as shown in FIG. Discharge to the electronic delay electric detonator 17 is started through the switch section 18a.

In this embodiment, the maximum standard value N for the number of electronic delay electric detonators 17 that can be connected is set to 100, and the reference voltage (■) is set to 1 (V). In addition, a minute constant current j flowing from the constant current source 19
is set to 0.1 (mA), and as described above, when the input resistance Z of the electronic delay electric detonator 170 is 100Ω and the ten electronic delay electric detonators 17 are connected between the output terminals 15 and 16, the loading When the counter side switch 18 is turned on (12
Load side voltage drop according to the formula v=i XR=O, ]mAX
(10 pieces x 100Ω) -〇, IV was generated. A/
The load side voltage drop V is input to the D converter 25, and (3
) Number of connected electronic delay electric detonators 17 1 = (
N/V)v=(100 pieces/IV)O, 1V=10 pieces are counted, and this number of connected pieces is stored as a digital value in the latch circuit 3J as the loaded number, and is numerically displayed by the loaded number display 33.

A self-control type constant current circuit using a transistor (FET) is used as the constant current power supply 19, and as an example, a 23-30Y type manufactured by Toshiba was selected and used in order to reduce the temperature coefficient. A precision voltage regulator diode is used for the reference power supply 26, and an example of this is the LV manufactured by Mitsumi Electric.
C-514 was used. As an example of the A/D converter 25, MC14433 manufactured by Motorola was used. The latch circuits 31 and 44 are, for example, Toshiba's TC-45.
08 was used. The loaded number display 33 is, for example, an LED display TLG-320 made by Toshiba, and a display control conversion device TC-4511 made by Toshiba, which converts a generally known BCD signal into a 7-segment signal and displays it on the LED. It was composed of vessels. The same type of blastable number indicator 35 was also used. As an example, TC-4013 manufactured by Toshiba was used as the flip-flop circuit 32. As an example of the comparator 46, TC-4585 manufactured by Toshiba was used. Also, D.C.
/DC converter] 3 uses a known technology, but in order to be able to charge a high-voltage, large-capacity blasting capacitor in a short time, and to prevent abnormal oscillations such as hunting. It is constructed using a three-stage control method. The blasting capacitor 36 is, for example, S manufactured by Marcon.
H capacitor was used.

"Effects of the Invention" By using the electronic delay electric detonator blaster created in accordance with the above embodiment and the electric blaster created based on Japanese Patent Application Laid-Open No. 60-221700, the blasting voltage can be applied to the electronic delay electric detonator. Table 1 shows an example of an experiment in which performance was compared by applying .

Table 1: The blaster shown in JP-A No. 60-221700 is configured to change the setting of the number of blasting outputs every 10 pieces.

The dividing accuracy of the blaster shown in JP-A No. 60-221700 is set so that 10 electronic delay electric detonators can be detonated with one dividing circuit, so if 5 are connected, there will be a charging error. As shown in the experimental results shown in Table 1, it is extremely large. Therefore, in the conventional blaster, it is necessary to increase the number of setting switching stages to multiple stages as described above. However, in this invention, whether the number of detonators connected is 10 or 5, the charging voltage error rate for 7 is 0.7 (%).
Met.

As described above, according to the present invention, the number of connected electronic delay electric detonators is automatically counted, this is stored as the loaded number, and then the number of blasts that can be blasted by the charging voltage of the blasting capacitor is counted, Since the charging voltage of the blasting capacitor is controlled so that the number of blasts that can be blasted is equal to the number of charges, a voltage within the specified range is always applied to each electric detonator regardless of the number of connected electric detonators, and accurate Delay time can be obtained, and there is no risk of misfire. The part added for this purpose is an electronic circuit, which can be made small and lightweight even if it is built into the blaster. Also, since the settings are not set by a person, there are no setting errors.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an example of a blaster for electronic delay electric detonators according to the present invention; FIG. 2 is a circuit diagram showing a portion of FIG. 1 in which the number of connected electronic delay electric detonators is counted; Figure 3 is a circuit diagram showing the part in Figure 1 where the blasting voltage is charged to the blasting capacitor, and Figure 4 is a circuit diagram showing the part where the blasting voltage is applied to the electronic delay electric detonator in the first round. It is. Patent applicant: Tsuguo Goto, Asahi Kasei Industries, Ltd.

Claims (1)

[Claims] (1) Electronic delay using a low-voltage battery as a power source, obtaining high voltage with a DC/DC converter, charging a blasting capacitor, and supplying the charged charge to multiple electronic delay electric detonators connected in series. A blaster for electric detonators includes a means for measuring the number of loaded electronic delay detonators and storing the measured number of blasting loads, and a voltage charged to the blasting capacitor by the DC/DC converter. A blasting device for an electronic delay electric detonator, comprising: means for measuring the number of blasts; and means for controlling the charging voltage of the blasting capacitor so that the number of blasts that can be blasted is equal to the number of loaded blasting caps. .