Method for loading explosives having wireless detonator and explosive loading tool

Abstract

To load explosives with wireless detonators into a charge hole without applying unnecessary shock.SOLUTION: An explosive loading tool 10 comprises a cylindrical body 11 with a slit 11a extending in an axial direction to store an explosive (a detonator dynamite 20) having a wireless detonator loaded into a charge hole formed in a pit face, and a feed rod 12 that has a contact portion 12a inserted into the cylindrical body 11 and contacting the side of the detonator dynamite 20 opposite to the bottom side of the charge hole, and a rod portion 12b connected to the opposite side of the detonator dynamite 20 at the contact portion 12a and extending in the axial direction of the cylindrical body 11, move the detonator dynamite 20 in the axial direction. The explosive loading tool 10 is used to load the detonator dynamite 20 into the charge hole.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method for loading explosives equipped with wireless detonators into a charge hole formed in a tunnel face, and to an explosive loading device used therefor. [Background technology]

[0002] 2. Description of the Related Art Conventionally, there has been known an explosive loading device that loads explosives into a charge hole formed in a tunnel face (see Patent Document 1, etc.). This explosive loading device includes an explosive supply device and a pressure-feed device that pressure-feeds the explosives supplied by the explosive supply device to a charge hole drilled in the face. The explosives include, for example, a cartridge-shaped explosive (parent die) that has an emulsion-type water-containing explosive and a detonator that ignites the water-containing explosive, and multiple cartridge explosives (additional dies) that are made up of water-containing explosives without detonators that are detonated by the detonation of the parent die. The parent die is attached to the tip of a loading pipe which is inserted into the charging hole, and is pressed by compressed air sent from a pressure feeding device to load the parent die into the bottom of the loading hole. The booster die is pressure-fed from the explosive supply device to the charge hole by a pressure-fed device and loaded behind the parent die. A wire is connected to one end of the detonator of the parent die, and the wire is drawn out from the loading hole, connected in series, and connected to a blasting machine. By operating the blasting machine and igniting the detonators of the parent die, the parent dies of all the charging holes can be exploded simultaneously. In addition, the explosion of the parent die triggers the additional die to explode, allowing the face to be efficiently crushed.

[0003] Meanwhile, explosives equipped with wireless detonators have been used in recent years (see Patent Document 2, etc.). A wireless detonator ignites a detonator by transmitting a detonation signal wirelessly, detonating an explosive. Wireless detonators include a battery-equipped type and a rechargeable type that wirelessly supplies power to the receiving coil of the wireless detonator using a transmitting coil. Wireless power supply is usually performed at a specified position near the opening of the loading pipe before the explosive is sent into the loading hole. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-113194 A [Patent Document 2] JP 2022-148257 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, when a wireless detonator is used as the detonator, as in Patent Document 1, if the parent die is loaded into the loading hole by compressed air, there is a risk that when the parent die collides with the end of the loading hole, the impact will cause the electronic circuits such as the control unit of the wireless detonator to malfunction, preventing the detonator from igniting and the parent die from exploding. Also, in Patent Document 2, a transmitting coil is used to charge the detonator of the parent die at a predetermined position (where the transmitting coil is located) near the end of the parent die opposite the face, which is the entrance of the loading pipe, and the parent die is then sent from the entrance to the exit of the loading pipe by air pressure.

[0006] The present invention has been made in consideration of the above-mentioned conventional problems, and aims to provide a method for loading an explosive equipped with a wireless detonator into a charging hole without subjecting the explosive to unnecessary impact, and an explosive loading device that is suitably used for loading the explosive. [Means for solving the problem]

[0007] The present invention is a method for loading an explosive equipped with a wireless detonator into a charge hole drilled in a face, characterized in that a slit extending in the axial direction is provided in a cylindrical body that contains the explosive, and the explosive is loaded into the charge hole by moving the feed rod toward the charge hole while abutting the abutment portion of a feed rod that is inserted into the cylindrical body from the slit and abuts the side of the explosive opposite the end of the charge hole, and the feed rod is connected to the side of the abutment portion opposite the explosive and extends in the axial direction of the cylindrical body, while abutting the abutment portion against the explosive. This allows the wireless detonator to be loaded into the bottom of the charge hole without subjecting the wireless detonator to unnecessary shock, thereby ensuring that the wireless detonator can be ignited. Furthermore, since an explosive insertion hole is provided in the cylindrical body and the explosive is stored in the cylindrical body through the explosive insertion hole, the explosive can be stored in the cylindrical body with a simple structure. In addition, the explosive is transported to a specified area within the cylinder by compressed air, and a speed reduction section for reducing the transport speed of the explosive is provided on the opposite side of the area from the charging hole, so that the explosive can be reliably stored in the specified area within the cylinder.

[0008] The present invention also provides an explosive loading device comprising a cylindrical body having an axially extending slit for storing an explosive having a wireless detonator to be loaded into a charge hole formed in a face, and a feed rod for moving the explosive in the axial direction, wherein the feed rod has an abutment portion inserted into the cylindrical body and abutting the side of the explosive opposite the end of the charge hole, and a rod portion connected to the side of the abutment portion opposite the explosive and extending in the axial direction of the cylindrical body. By using an explosive loading device of this configuration to fill a charge hole with an explosive having a wireless detonator, it is possible to load the wireless detonator into the bottom of the charge hole without subjecting the wireless detonator to unnecessary impact. The wireless detonator is a rechargeable detonator equipped with a receiving coil or a receiving antenna, and a power supply device equipped with a transmitting antenna for supplying power to the rechargeable detonator is provided at the contact portion to supply power to the rechargeable detonator wirelessly (microwaves), so that the degree of freedom of the power supply position can be increased compared to the conventional power supply method using a coil. Therefore, even if the explosive storage position is shifted during power supply, the wireless detonator can be reliably charged.

[0009] It should be noted that the above summary of the invention does not list all of the necessary features of the present invention, and any subcombination of these features may also constitute an invention. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing an explosive loader according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a diagram showing the relationship between the explosive charge and the charge hole. [Diagram 3] A diagram showing a parent die equipped with a wireless detonator and a method of charging the wireless detonator. [Figure 4] FIG. 2 is a diagram showing a method for loading explosives according to the first embodiment. [Diagram 5] FIG. 11 is a diagram showing a method of loading explosives according to the second embodiment. [Figure 6] 11A to 11C are diagrams showing another example of the explosive loading method of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Embodiment 1 Figures 1(a) and (b) show an explosive loading device 10 according to this embodiment 1. The explosive loading device 10 comprises a cylindrical body 11 and a feed rod 12, and is a tool for loading a parent die 20 into a charge hole 2 drilled in a face 1, as shown in Figures 2(a) and (b). The cylindrical body 11 is a long cylinder with a length L greater than the depth D of the charge hole 2, and has a slit 11a and an explosive insertion hole 11b formed on its side. Here, the face 1 side of the cylindrical body 11 is the front side, the opposite side to the face 1 is the rear side, and the upper side of FIG. 1 is the upper side and the lower side is the lower side. FIG. 2(a) is a view (plan view) of the cylindrical body 11 seen from above, and FIG. 2(b) is a view (left side view) of the cylindrical body 11 seen from the left side. A filling hose 3, one end of which is connected to a pressure-feeding device (not shown), is connected to the rear end of the cylindrical body 11. The slit 11a is a gap extending in the axial direction of the cylindrical body 11 from a point approximately (L / 4) from the rear end of the cylindrical body 11, and is formed so as to open to the front end of the cylindrical body 11 with a width dimension slightly larger than the thickness of the abutment portion 12a of the feed rod 12. The explosive insertion hole 11b is a rectangular hole provided on the side of the cylindrical body 11, the width dimension of which is larger than the outer diameter of the parent die 20 and the length dimension of which is larger than the length dimension of the parent die. The explosive insertion hole 11b may be formed directly above the cylindrical body 11, but in this example, the explosive insertion hole 11b is formed so as to extend from the rear end of the slit 11a to the front of the cylindrical body 11. That is, the explosive insertion hole 11b in this example is formed at an angle from the horizontal plane, and the slit 11a and the explosive insertion hole 11b overlap at the rear end side of the slit 11a. At this time, if the length dimension of the explosive insertion hole 11b is made larger than the sum of the length dimension of the parent die 20 and the width dimension of the abutting part 12a of the feed rod 12, the abutting part 12a of the feed rod 12 can be easily inserted into the cylindrical body 11.

[0012] The feed rod 12 is an L-shaped member in a plan view, and includes a contact portion 12a and a rod portion 12b. The abutment portion 12a is a rectangular plate-shaped member whose length is longer than the outer diameter of the cylinder 11 and which abuts against the rear end surface (the side opposite the end of the charge hole 2) of the parent die 20 inserted into the cylindrical body 11 and extends in the left-right direction; when inserted into the cylinder 11 and abutted against the parent die 20, it extends outside the slit 11a at least further than the width dimension of the rod portion 12b. The rod portion 12b is a long member extending in the front-to-rear direction and whose length is longer than the depth of the charge hole 2, and is connected to the abutment portion 12a on the slit 11a side of the abutment portion 12a and on the outside of the cylindrical body 11. 3(a) is a diagram showing an example of a parent die 20 equipped with a wireless detonator, and the parent die 20 is equipped with a wireless detonator 21, an electronic circuit 22, explosives 23, and a receiving antenna 24. The receiving antenna 24 is a cylindrical metal container that has slots for transmitting and receiving radio waves or has a built-in coil, and also serves as a storage container for storing the wireless detonator 21 to explosives 23. The electronic circuit 22 includes a receiving section 22 a , a charging section 22 b , and a control section 22 c , and controls the ignition of the wireless detonator 21 . 3(b), in this example, a wireless module 12c equipped with a high-frequency generator and a power source such as a button battery is provided on the rod portion 12b of the feed rod 12, and a transmitting antenna 12d made of a copper foil pattern on a printed circuit board is provided on the contact portion 12a, so that power is supplied to the charging portion 22b of the parent die 20 by wireless communication (for example, microwaves with high linearity) via the receiving antenna 24 and the receiving portion. The wireless module 12c and the transmitting antenna 12d are connected by a coaxial cable 12k, and high-frequency signals are transmitted therebetween. Also, an identification signal that assigns the control ID of the wireless detonator 21 is sent from the transmitting antenna 12d to the control unit 22c of the parent die 20. The control unit 22c controls the ignition unit 21v of the wireless detonator 21 to ignite the wireless detonator 21 only when it receives an ignition start signal that has the control ID assigned thereto. When transmitting the identification signal and power, a time slot for transmitting the identification signal (modulated signal) in a time-division manner and a time slot for transmitting an unmodulated signal for power supply are prepared.

[0013] Next, a method for loading an explosive equipped with a wireless detonator will be described. First, as shown in FIG. 4(a), the tip of the cylindrical body 11 is inserted into the explosive hole 2, and then, as shown in FIG. 4(b), the parent die 20 is inserted into the cylindrical body 11 through the explosive insertion hole 11b of the cylindrical body 11. Next, as shown in FIG. 4(c), the abutment portion 12a of the feed rod 12 is inserted into and abutted against the rear end face of the parent die 20 housed in the cylindrical body 11, charging the wireless detonator 21 and providing the parent die 20 with a control ID for ignition. Then, as shown in Figure 4 (d), the tip of the cylindrical body 11 is inserted to a predetermined position in the charging hole 2, and the rod portion 12b of the feed rod 12 is moved forward, thereby moving the parent die 20 inside the cylindrical body 11 toward the charging hole 2. Next, as shown in FIG. 4(e), after the parent die 20 is loaded into the bottom of the charging hole 2, the feed rod 12 is withdrawn until the contact portion 12a is located rearward of the opening of the charging hole 2. Then, after the feed rod 12 is removed and collected from the cylindrical body 11, the additional die 4 is loaded into the charging hole 2 as shown in FIG. 4(f). The additional die 4 is pressure-fed by a pressure-fed device from an explosive supply device (not shown), passes through the loading hose 3 and the cylindrical body 11, and is loaded on the rear side of the parent die 20. The number of additional dies 4 to be loaded is preset according to the position of the charging hole 2.

[0014] Embodiment 2 In the above-mentioned embodiment 1, the parent die 20 is attached inside the cylindrical body 11 through the explosive insertion hole 11b formed in the cylindrical body 11, but as shown in Figures 5(a) and (b), the parent die 20 may be sent to a predetermined area (hereinafter referred to as the parent die setting section R1) inside the cylindrical body 11 by compressed air. In this example, in order to stop the parent die 20 in a predetermined region R1, a deceleration section R2 for decelerating the conveying speed of the parent die 20 is provided behind the parent die setting section R1 (on the side of the charging hose 3), and a stopper section 11c is provided in front of the parent die setting section R1 (on the side of the charging hole 2). Note that the stopper section 11c may be omitted if the pressure of the compressed air is appropriately set. In the deceleration section R2, a deceleration mechanism such as a damper 11d is preferably used. As the damper 11d, a damper including a pair of upper and lower rubber pads 11p and a spring member 11q for biasing each of the rubber pads 11p toward the center of the cylindrical body 11 is preferably used. After the parent die 20 is stopped in the parent die setting section R1, as in this embodiment 1, the abutment portion 12a of the feed rod 12 is inserted into and abuts the rear side of the parent die 20 stored in the cylindrical body 11, and the rod portion 12b of the feed rod 12 is moved forward to move the parent die 20 inside the cylindrical body 11 in the direction of the charging hole 2. This allows the parent die 20 to be fed from the explosives supply device as well, reducing manual work.

[0015] Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It is clear to those skilled in the art that various modifications and improvements can be made to the above embodiments. It is clear from the claims that such modifications and improvements can also be included in the technical scope of the present invention.

[0016] For example, although the feed rod 12 is L-shaped in the first and second embodiments, it may be flat. In that case, however, in order to position the rod portion 12b outside the cylindrical body 11, it is necessary to make the length dimension of the cylindrical body 11 behind the explosive insertion hole 11b or the parent die setting section longer than the length dimension of the rod portion 12b, and to provide a slit 11a in the part of the cylindrical body 11 behind the explosive insertion hole 11b. In the first and second embodiments, the shape of the contact portion 12a is rectangular, but it may be triangular or trapezoidal with the side on the parent die 20 side being longer.

[0017] Furthermore, in the first and second embodiments, the feed rod 12 is moved manually. However, as shown in Figures 6(a) and 6(b), the feed rod 12 may be moved mechanically using a feed mechanism 50 including a rubber roller 51 that contacts the upper or lower side of the rod portion 12b of the feed rod 12 and a motor 52 that rotates this rubber roller 51, or a well-known feed mechanism such as a rack and pinion mechanism. Further, the power supply to the charging portion 22b of the parent die 20 is not limited to microwaves, but may be an electromagnetic induction method or an electrolytic coupling method. [Explanation of symbols]

[0018] 1. Face, 2. Charge hole, 3. Charge hose, 4. Addition die, 10 explosive loading device, 11 cylinder, 11a slit, 11b explosive insertion hole, 12 feed rod, 12a abutment portion, 12b rod portion, 20 parent die, 21 wireless detonator.

Claims

1. A method for loading explosives equipped with wireless detonators into a charge hole drilled in a face, comprising the steps of: A slit extending in an axial direction is provided in a cylinder that contains the explosive, A method for loading an explosive equipped with a wireless detonator, comprising the steps of: a feed rod having an abutment portion that is inserted into the cylindrical body through the slit and abuts the side of the explosive opposite the end of the charge hole, and a rod portion that is connected to the side of the abutment portion opposite the explosive and extends in the axial direction of the cylindrical body, and abutting the abutment portion against the explosive, while moving the feed rod toward the charge hole, thereby loading the explosive into the charge hole.

2. 2. The method for loading explosives according to claim 1, further comprising providing an explosive insertion hole in said cylindrical body, and storing said explosives in said cylindrical body through said explosive insertion hole.

3. The explosive loading method according to claim 1, characterized in that the explosive is transported to a predetermined area within the cylinder by compressed air, and a speed reduction section for reducing the transport speed of the explosive is provided on the opposite side of the area from the charging hole.

4. A cylinder having an axially extending slit for accommodating an explosive having a wireless detonator to be loaded into a charge hole formed in the face; A feed rod for moving the explosive in the axial direction, The feed rod is An explosive loading device comprising: a contact portion that is inserted into the cylindrical body and contacts the side of the explosive opposite the end of the charge hole; and a rod portion that is connected to the side of the contact portion opposite the explosive and extends in the axial direction of the cylindrical body.

5. An explosive loading device as described in claim 4, characterized in that the wireless detonator is a rechargeable detonator equipped with a receiving coil or a receiving antenna, and a power supply device equipped with a transmitting antenna for supplying power to the rechargeable detonator is provided at the contact portion.

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