JPS62153699A - Electric blasting method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Fields of use upon graduation] The present invention relates to a TL magnetic induction blasting method.

[Prior Art] Conventionally, as a blasting system using electromagnetic induction of 6i1 substance, for example, as shown in FIG.
No. 608, or JP-A No. 6, as shown in Figure 6.
No. 0-86400 is known.

In the electric blasting neck shown in Figure 5, l is a power source, 2 is a charging/discharging capacitor, 3 is a trigger circuit, 4 is a thyristor, 5
is an oscillator surface consisting of these parts 1 to 5, 6 is a loop busbar, 7 is a transformer section, 8 is a secondary winding wound around the core lO, and 9 is an electric detonator connected to the secondary winding 8. be.

Here, a large pulsed current obtained by extracting the electric charge charged in the capacitor 2 by the power supply 1 from the thyristor 4 which is turned on by the trigger circuit 3 is passed through the loop-shaped bus bar 6.
A secondary '1u current is taken out by each secondary winding 8 from a plurality of transformer parts 7 having this bus bar 6 as a primary circuit, and a pulse current is sent to an electric detonator 9 connected to each of these windings 8.
The electric detonator 9 is then ignited.

In addition, in FIG. 6, 11 is a power pulse generator;
Reference numeral 2 designates a high frequency conversion section, 13 a bus bar configured to have constant impedance, 14 a transformer section, and 15 an electric detonator section.

The power pulse generator 11 includes a DC/DCC/formula 16,
It has a charging/discharging capacitor 17 and a charging/discharging changeover switch 18. The discharge output pulse is taken out from the terminal 19 and supplied to the high frequency converter 12 via its input terminal 20. Here, the high frequency converter 12 includes tuning coils 21 and 22.
, a tuning capacitor 23 , a high-frequency oscillation transistor 24 , bias resistors 25 and 26 , and a bias capacitor 27 , and a high-frequency oscillation output is taken out from its output terminal 28 and supplied to the bus 13 . The transformer section 14 has a transformer core 29 that passes through the bus bar 13 and is electromagnetically coupled to the transformer core 29 and a loop 30 that passes through the core 29 . Here, the core 29 includes the bus bar 13 and the loop 3.
A cut section is provided to allow the 0 to pass through. Electric detonator section 15
has a detonator 31 connected to a loop 30.

In this way, the power pulse generator 11 and the high frequency converter 12
A high frequency current with a frequency of 100 kHz to NIMHz is passed from a blaster having a constant impedance to a bus 13 configured to have a constant impedance, and a secondary current is passed through a transformer core 29 having a cut part electromagnetically coupled to this bus 13. to detonate the electric detonator 31.

[Problems to be solved by the invention T, III as shown in Figure 4! In the case of guided blasting, 1
The mother Pi! Therefore, in order to detonate the detonator 9 on the secondary side, it is necessary to flow a pulsed Ti current of an inconceivable large current to the bus bar 6 at the risk of power loss. Moreover, since the frequency of the oscillating waveform of the pulsed current is several hundred llz, the transformer core lO
The size of the ff1 becomes large, making it difficult to handle during transportation and work.
It becomes f. Furthermore, if a large number of electric detonators 9 are required to pass the busbar 6 through the transformer core IO, a large number of transformer cores 10 are also required, so the wiring time required for the transformer core 10 is i' There is also a greater risk of getting tangled with the busbar during work. To prevent this, bus 6
If the transformer core IO is passed through a large number of transformer cores one after another while pulling, there is a risk that the legs of the electric detonator 9 will be pulled and a shock may be given to the electric detonator 9, which is not practical from a security point of view and is not desirable. It was nothing special.

In the case of Fig. 5, the above drawbacks are somewhat improved, but
Since the full wave generator is a self-oscillation type using a tuning coil and a tuning capacitor, there is a problem in that a constant impedance line must be used as the bus bar 13. To be more specific, the oscillation frequency of the full wave generator is determined by the inductance of the tuning coil 21 and the bus bar 13, and the capacitance of the tuning capacitor 23, so if the inductance of the light wave circuit including the bus bar 13 changes, the oscillation state will also change. , there was a risk of a misfire. Therefore, there is no choice but to use a constant impedance bus bar.

However, when considering an actual light wave circuit, it is very difficult to maintain the bus bar 13 at a constant impedance.

In other words, the impedance on the primary side changes depending on the number of transformer cores 29 and the number of detonators 31 that load on the bus bar 13. Considering only the impedance of the bus bar 13, it changes greatly depending on the distance from the ground, and the oscillation state changes each time, so there is a risk that stable blasting cannot be performed. Therefore, in order to maintain a constant impedance at least at the bus bar 13, a coaxial cable must be used as the bus bar 13, which poses a problem in terms of cost.

Additionally, in this case, the frequency is 100 kl (
Since the frequency is as high as about z to IMHz, the circuit impedance becomes high, and there is also the problem that the blasting performance largely depends on the length of the bus bar 13. When the generatrix length becomes longer, wires with a larger diameter must be used, which also poses problems in terms of workability.

On the other hand, when using a single-wire auxiliary busbar, it is easy to install a coupler, but since high-frequency current is passed through the busbar circuit, the impedance changes greatly depending on the wiring situation. For this reason, the blaster output voltage must be increased. In that case, large electromagnetic wave interference occurs due to leakage of electromagnetic waves generated at the bus bar.

Therefore, in order to lower the impedance of the bus bar, it is better to use parallel wires, but when using parallel bus bars, 2
Since the adhesive between the lines is strong, it is difficult to separate by hand, and workability is extremely poor.

Alternatively, if the bus bar is made loose to make it easier to insert the coupler, it is necessary to weave the parallel single wire, but since the bus bar is a consumable item, such loose machining is costly. There was a problem from this point of view.

[Means for Solving the Problems] As a result of various studies on conventional electric blasting devices that have such problems, the present inventors constructed a blaster in the form of a separately excited oscillator, and Oscillation frequency: 20 kl (z~50
The present invention was completed by discovering that by setting the blasting frequency to kHz, blasting can be carried out sufficiently with a normal blasting bus bar.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electric blasting method that can solve these problems and stably perform electromagnetic shock wave guidance even when a normal blasting bus is used.

Another object of the present invention is to use a low-impedance auxiliary bus bar and solve the above-mentioned problems, thereby making the work of drawing the blasting bus bar and attaching the coupler quick and easy, and making it possible to improve the conductivity of the electric bun. An object of the present invention is to provide an electric blasting method capable of efficiently emitting waves over a wide range.

In order to achieve such an object, a first form of the present invention provides a blaster having a capacitor charging section and a high frequency converting section that converts discharge current from the charging section into a high frequency current, and a twin core bus and an auxiliary bus. A blasting bus consisting of a bus bar is connected, and an electric detonator connected to a leg wire with a loop is connected to the auxiliary bus bar by electromagnetic induction, and a high frequency current from the blaster is passed through the electric detonator to detonate the electric detonator. In the blasting method, the frequency of the high frequency current taken out from the high frequency converter is set within the range of 20 ktlz to 50 kHz, and the auxiliary bus bar and the leg wire are connected by inserting a ferrite core. In the second form, a blasting bus consisting of a twin core bus bar and an auxiliary bus bar is connected to a blaster having a capacitor charging section and a high frequency conversion section that converts the discharge current from the charging section into a high frequency current. In an electric blasting method in which an electric detonator connected to a leg wire with a loop is coupled by electromagnetic induction and a high-frequency current from the blaster is passed through the electric detonator to detonate the electric detonator, the electric detonator is used as an auxiliary bus bar at mutually related positions. A reciprocating conducting wire is configured with a relationship, the reciprocating conducting wire is partially separated, one of the separated conducting wires and the loop are inserted into an open ferrite core, the ferrite core is closed, and one of the separated conducting wires is inserted into the ferrite core which is open circuit. and the loop through the ferrite core = I+! It is characterized by bonding by 1 dim.

[Function] In the present invention, when electromagnetically coupling the auxiliary bus and the leg wires, a ferrite core is inserted between the two, and the frequency of the high-frequency current flowing through the auxiliary bus is set to 20kHz to 50kl! Since it is set within the range of z, the circuit impedance of the bus bar can be made as low as possible while maintaining the characteristics of the ferrite core.As a result, even if a normal bus bar is used, the bus bar does not have to be kept at a constant impedance. , sufficient blasting can be performed with a low output voltage.

Furthermore, since conductors with a mutually related positional relationship are used as the auxiliary bus, the circuit impedance of the bus is substantially reduced, and even when a large current is passed through the auxiliary bus, electromagnetic waves generated by the auxiliary bus are generated. cancel each other out, so no leakage of electromagnetic waves occurs, and therefore no radio interference occurs. In addition, a small ferrite bump 7\
Since the core can be sufficiently electromagnetically coupled, the core can be easily transported, and the workability of routing the auxiliary bus bar is also excellent.

Moreover, in this case, there is no problem even if the output voltage of the blaster is increased, but as mentioned above, in combination with setting the frequency of the high-frequency current to 20kHz to 50kHz, it is possible to increase the output voltage without increasing the output voltage. Electromagnetic induction blasting can be performed stably.

[Example] The present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an example of an electric blasting system for carrying out the present invention. Here, 40 is a separately excited oscillation type blaster having a capacitor charging section 41 and a high frequency converting section 42 that converts a discharge from the charging section 41 into a high frequency current. The circuit disclosed in No. An example of such a circuit is shown in FIG.
Details will be explained later.

In FIG. 2, the charging unit 41 includes a DC/DCC/type converter 102 that converts the voltage of the battery 101 into a predetermined DC voltage, a charge/discharge selector switch 103, and a DC/DCC/type converter 102 that converts the voltage of the battery 101 into a predetermined DC voltage. The blasting capacitor 104 is charged by a capacitor 102. High frequency converter 4
2 includes a constant voltage generating circuit 105 which obtains a predetermined constant voltage output from the voltage supplied from the capacitor 104 via the switch 103, and a CR oscillator or the like which is driven by the constant voltage from this circuit 105 and performs stable oscillation. excavator 106
a buffer 107 for buffering the oscillation output to subsequent circuits; and a high-frequency output is extracted by switching based on the oscillation output from the buffer 107.
For example, it has a switching section 108 configured with a power MO5FET, and an output section 109 that outputs the high frequency output from the switching section 108 to the bus 47.

Buffer 107 prevents loading effects from the bus circuit from entering excavator 106 and thereby
6 can always perform stable oscillation without being affected by the load of the bus circuit, that is, the wiring conditions. The output section 109 can be configured with, for example, a push-pull output transformer that receives the push-pull output from the switching section 108, and a discharge resistor for circuit protection disposed on the secondary side of the transformer. By using a ferrite core as the core of this transformer, stable discharge characteristics are exhibited even at frequencies of 20 kHz to 50 kHz, and the output section 109 can be configured to be smaller than an air-core coil.

According to such a circuit arrangement, the oscillation state does not change due to changes in the inductance and impedance of the circuit after the blasting bus 47. ) In other words, since the oscillation frequency does not change depending on the wiring condition of the blasting bus 47,
It is possible to stably supply high-frequency current to the bus circuit with a set frequency that matches the applied frequency of the ferrite core.

A blasting bus 47 having a hole core is connected to output terminals 43 and 44 of the blasting device 40 . On the other side of this blasting bus 47, there are 2
The main auxiliary busbars 48 are connected in a loop. That is, the other sides of these auxiliary bus bars 48 are connected to each other to form a loop-shaped auxiliary bus bar.

Reference numeral 49 denotes a coupler, which, as shown in FIG. 54 is a cover that protects the exposed portion of the ferrite core 52. ferrite cores 52 and 53 having a U-shaped groove shape and a flat plate shape are buried therein, respectively. The upper half 51 is shown in FIG.
In the sliding state shown in B), the ferrite core 5
2 and 53 form a closed magnetic path. It should be noted that when sliding in this manner, the cover 54 is connected to the lower half 50 so that it is pushed by the upper half 51 and bent or removed as shown in FIG. 3(B). There is.

As shown in FIG. 3 (8), the leg wire 62 and the auxiliary bus bar 48 connected to the electric detonator 61 are inserted into the U-shaped groove-shaped core 52, and then inserted into the upper half as shown in FIG. 3 (D). While sliding the portion 51 to close the magnetic path between the cores 52 and 53,
The auxiliary bus bar 48 and the leg wires 62 are sandwiched between the cores 52 and 53, so that the auxiliary bus bar 48 and the leg wires 62 are electromagnetically coupled. FIG. 1 shows a number of leg lines 62 connected to the auxiliary bus bar 48 in this manner.

FIG. 4 shows another example of an electric blasting system for carrying out the present invention. Here, instead of using the loop-shaped auxiliary bus bar 48 shown in FIG. 1 as the auxiliary bus bar, auxiliary bus bars 71 and 72 are The impedance of the bus bar is reduced as the associated reciprocating conducting wires, and at a location 73 where the coupler 49 is desired to be attached, these conducting wires 71 and 72 are separated from each other so that the coupler 49 can be attached.

For example, at an appropriate position 73 between the couplers 49, that is, at a position where the coupler 49 is desired to be sandwiched, the two parallel wires 71 and 72 whose sheaths are bonded to each other are partially separated, and then joined at the position 73. form a loop as it is,
The coupler 49 may be inserted into the loop.

Note that the degree of adhesion in this case is preferably weak enough to allow two lines to be easily drawn.

Alternatively, instead of the two parallel auxiliary wires as described above, a partial loop can also be formed by using a reciprocating single wire that is partially fused or bonded. In this case, when drawing the auxiliary bus bar, split the parallel line and make two
It is convenient because there is no need to draw lines on the book.

In the present invention, since the two conductive wires are arranged in relation to each other as described above, low impedance can be achieved.
In order to configure such an auxiliary bus line, for example, two parallel
When coating the auxiliary line with resin and heat-sealing it with two heat rollers, at the point where you want to create the above-mentioned loop, widen the gap between the heat rollers to weaken the degree of heat-sealing of the coating, or A loop is easily formed between two wires by not applying any pressure with a heat roller.

Even if the inductance of the above-mentioned auxiliary bus bar changes slightly due to changes in the shape of the loops formed in various places, the blaster 10
Since 6 is a separately excited oscillation method, the oscillation state changes, etc.
It will not interfere with the blasting work. Furthermore, as mentioned above, such auxiliary busbars can be easily manufactured by, for example, making the adhesion between the lines very weak when manufacturing normal parallel auxiliary lines, so they are inexpensive in terms of cost. It is.

Next, the ferrite core used in the coupler is usually one with high magnetic permeability in order to make it compact and easy to use in order to improve workability. As the frequency increases, the circuit impedance due to the bus bar etc. increases, so in order to flow a large high frequency current to the bus bar on the next side of the core, the blaster output voltage must be increased, and in that case, the radio wave as described above Obstacles will also increase.

Therefore, in practice, considering the balance between the performance of the ferrite core and the circuit impedance, the oscillation frequency should be set to 2Qk.
It is best to set it in the range of Hz to 50kflz. Conversely, when the frequency is 20 kHz or less, although the circuit impedance becomes low, the performance of the ferrite core is extremely degraded. By setting the frequency within the above-mentioned range, practical blasting with a low output voltage and with little influence from the blasting bus bar becomes possible.

In addition, in the present invention, since a separately excited oscillator is used as the blaster 40, the oscillation frequency of the blaster 40 does not change at all.

Therefore, the oscillation frequency of the oscillator 40 is
It is sufficient to set the frequency according to the electric tin coupling characteristics of the ferrite core of No. 9, and as mentioned above, 2O-
It was confirmed that it is effective to set the value to 50k) Iz.

Next, specific examples of the present invention will be shown.

Examples 1 to 4 The hole core generatrix 47 has a cross-sectional area of 0.75 mm + 2. length lo
50 m or 100 m in length as the auxiliary bus bar 48, ferrite core (μm 2500), effective saturation magnetic flux density Bs-4800 Gauss, dimensions -15X.
Connector 49 with 10x 15mm (TDK ++3S
ll-15 type), 20 detonators 61 were used for each coupler 49 with 5 wooden hooks, and the leg line 62 was 1.5 m.
The blaster 40 has a capacity of 280V and 400μF.

When a total of 100 detonators were fired simultaneously using a detonator with an output voltage of aoovp-p and an output frequency of 20 kHz, all detonators exploded completely. The results are shown in Table 1 below.

1st Table Examples 5 to 7 and Comparative Examples 1 to 4 A blaster 40 under the same conditions as Example 1, a coupler 49 (20 pieces) having the same ferrite core, a detonator 61 (5 wooden hooks), and a 6.0 m using the leg line 62, and the hole core generating line with a cross-sectional area of 0.75 m.
m2 and the length is 100 m, the auxiliary bus bar is a partially bonded reciprocating single wire, and the length is 0.6n+n+φ and is 50+n, and the oscillation frequency of the blaster 40 is 10k) lx N
When 100 shots were fired while changing the frequency within a range of 100kHz, the results shown in Table 2 were obtained.

From this result, a complete explosion was achieved when the oscillation frequency was set within the range of 20kHz to 50kHz.

Table 2 [Effects of the Invention] As is clear from the above, according to the present invention, even if a normal full-wave bus is used, stable electric 61-induced wave generation can be performed efficiently and without being affected by the wiring length or wiring condition. It can be carried out over a wide range without any problems.

Moreover, in the present invention, since the auxiliary bus bar uses reciprocating conducting wires arranged in a mutually related positional relationship, such as two parallel wires, a reciprocating single wire, or a looped single wire, the impedance of the full-wave bus is low. Therefore, there is little risk of radio interference even if the output voltage of the blaster is increased, and each part of this reciprocating conductor has a loop-shaped part separated from the two reciprocating conductors to make it easier to attach a coupler. Since the conductor wires of these two trees are set up in advance or weakly glued together so that they can be easily separated, it is difficult to install the coupler, and by extension, to wire the auxiliary bus bar.
Highly efficient in pulling.

In addition, the auxiliary busbars used in the present invention are manufactured by coating two copper wires during the production of normal parallel busbars. Since it can be easily realized without bonding, it can be manufactured at a low cost similar to that of ordinary parallel bus bars, and is therefore preferable as an auxiliary bus bar, which is a consumable material.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an example of an electric blasting system implementing the present invention, Fig. 2 is a block diagram showing an example of the blaster, and Figs. 3 (A) and (B) are the system shown in Fig. 1. 4 is a configuration diagram showing another example of an electric blasting system implementing the present invention, and FIGS. 5 and 6 are two examples of conventional electric blasting equipment. FIG. DESCRIPTION OF SYMBOLS 1... Power supply, 2... Capacitor, 3... Trigger circuit, 4... Silicon control rectifier, 5... Oscillator, 6... Bus bar, 7... Transformer part, 8...・Secondary winding, 9... Electric detonator, 1O... Transformer core, 11... Power pulse generation section, 12... High frequency conversion section, 13... Bus bar, 14... Transformer section, Engineering 5... Electric detonator section, 1δ... DC/DCC/type-ta, 17... Charge/discharge capacitor, 18... Changeover switch, 19, 20. 28... Terminal, 21, 22. ... Tuning coil, 23... Tuning capacitor, 24... Transistor, 25, 26... Bias resistor, 27... Bias capacitor, 29... Transformer core, 30... Loop, 31. ...Detonator, 32...Cut part, 40...Blaster, 41...Charging part, 42...High frequency conversion part, 43.44...Output terminal, Ear...Hole core bus bar, 48... Auxiliary bus bar, 49... Coupler, 50... Lower half part, 51... Upper half part, 52.53... Ferrite core, 54... Cover, 61... Electric detonator, 62... Leg wire, 71, 72... Auxiliary bus bar, 73... Adhesion position, 101... Battery, 102... DC/DCC/type-ta, 103... Charging/discharging Switch, 104... Full wave capacitor, 105... Constant voltage generation circuit, 106... Oscillator, 107... Buffer, 108... Switching section, 109... Output section.

Claims (1)

[Claims] 1) A blaster having a capacitor charging section and a high frequency conversion section that converts a discharge current from the charging section into a high frequency current,
A blasting bus consisting of a twin-core bus and an auxiliary bus is connected, an electric detonator connected to a leg wire having a loop is coupled to the auxiliary bus by electromagnetic induction, and a high-frequency current from the blaster is caused to flow through the electric detonator. In the electric blasting method for detonating the electric detonator, the frequency of the high frequency current taken out from the high frequency converter is set within a range of 20 kHz to 50 kHz, and a ferrite core is inserted between the auxiliary bus bar and the leg wire. An electrical emission method characterized by combining. 2) A blaster having a capacitor charging section and a high frequency conversion section that converts a discharge current from the charging section into a high frequency current,
A blasting bus consisting of a twin-core bus and an auxiliary bus is connected, an electric detonator connected to a leg wire having a loop is coupled to the auxiliary bus by electromagnetic induction, and a high-frequency current from the blaster is caused to flow through the electric detonator. In the electric blasting method for detonating the electric detonator, the auxiliary bus bar constitutes reciprocating conductors with a mutually related positional relationship, the reciprocating conductors are partially separated, and one of the separated conductors is provided. and the loop are inserted into an open ferrite core, the ferrite core is closed, and one of the separated conducting wires and the loop are inserted into the ferrite core and coupled by electromagnetic induction. Electric blasting method.