JP5153909B2 - Parent die protection cap and loading method using the same - Google Patents

Description

  The present invention is used for loading a parent die in mechanical loading in which an explosive is manually loaded into a charging hole drilled in a face or loaded via a loading pipe or a loading hose, for example, in tunnel blasting excavation work. The present invention relates to a protective cap, a parent die with a protective cap, and a method for loading an explosive.

  Normally, in tunnel blast excavation work, a detonator-equipped parent die (explosive pack) that is loaded into a charge hole drilled in the bedrock is used as a parent die with a leg wire to prevent the attached detonator from falling off. In a detonator with a light guide tube, a method of fixing a bent light guide tube portion to a parent die with an adhesive tape or the like has been used.

  However, since the electrical detonator legs and the detonator with detonator are exposed, when loading them into the charge hole, depending on the rocky and joint conditions, the rough charge hole Rubbing with walls or slurries (explosive earth and sand), etc., damages the leg wire or the lead pipe at the tip of the parent die, exposes the internal copper wire, damages the guide pipe, and opens holes. In addition, the leg wire may be cut (disconnected) in the charge hole, or the fire guide tube may be cut, and normal blasting may not be performed. In particular, when loading an explosive, such as an ANFO loader, with a machine, when loading is performed via a loading pipe or a loading hose, a leg line is sandwiched between the tip of the loading pipe or the loading hose and the hole wall or a gap. There was a tendency that the damage or disconnection of the leg line as described above was likely to occur.

  For the above problem, by setting the tear strength and leg burying degree of the parent die to a specific range, the leg line does not protrude from the parent die surface during charging, and the gap scattered in the blast hole There is disclosed a parent die that is not broken by friction or the like and the covering resin of the leg wires is not peeled off (see, for example, Patent Document 1).

JP-A-2004-360997 (pages 2 to 4)

  However, although this parent die is effective for manual loading using a loading rod, the problem has not been solved to a satisfactory extent when machine loading is performed. In other words, when a parent die is attached to the tip of the loading pipe or loading hose and loaded into the charge hole, the leg line is sandwiched between the hole wall or gap at the tip of the loading pipe or loading hose. There has been a problem that it is still impossible to prevent damage to the sheathing of the leg wire and the heat guide tube and the occurrence of disconnection.

  Accordingly, an object of the present invention is to provide a protective cap that can be easily attached to the parent die, and sufficiently suppress damage to the detonator leg wire or the guide tube even when the machine is loaded. It is an object of the present invention to provide a protective cap, a parent die with a protective cap, and a method for loading an explosive.

  In order to achieve the above object, the parent die with a protective cap according to the first aspect of the present invention is a bottomed cylindrical protection in which the inner diameter of the opening is equal to or larger than the outer diameter of the parent die and the outer diameter is equal to or smaller than the charge hole diameter. A cap is mounted over the detonator side of the parent die and is configured to protect a leg wire or a light guide tube connected to the detonator, and the protective cap has an inner diameter at its opening that is smaller than an inner diameter at the bottom. The inner peripheral surface is tapered so as to increase, and the inner diameter of the bottom portion of the protective cap is set in the range of −5% to + 10% with respect to the outer diameter of the parent die.

  The protective cap of the second invention is a protective cap used for the parent die with the protective cap of the first invention, wherein the inner diameter of the opening is equal to or larger than the outer diameter of the parent die, and the outer diameter is equal to or smaller than the charge hole diameter. Yes, it is attached to the detonator side of the parent die with a detonator, and is configured to protect the leg wire or the lead tube connected to the detonator, and the protective cap has an inner diameter at its opening that is smaller than the inner diameter at the bottom. The inner peripheral surface is tapered so as to increase, and the inner diameter of the bottom portion of the protective cap is set in the range of −5% to + 10% with respect to the outer diameter of the parent die.

  The method for loading an explosive of the third invention is a loading method for mechanically loading an explosive into a charge hole. The parent die with a protective cap of the first invention is attached to the tip of a load pipe or a load hose and loaded into the charge hole. And is loaded with explosives.

According to the present invention, the following effects can be exhibited.
In the parent die with the protective cap according to the first aspect of the invention, the protective cap is mounted on the detonator side of the parent die, and is configured to protect the leg wire or the fire guide tube connected to the detonator. For this reason, by using the protective cap, when the machine is loaded, the vicinity of the mounting portion of the detonator on the insertion side to the charge hole which is easily damaged is protected, and the tip and the hole wall of the loading pipe or loading hose Since it is possible to prevent the leg wire or the light guide tube from being caught by slack, damage to the leg wire or the light guide tube of the detonator can be sufficiently suppressed. Furthermore, the protective cap is formed in a bottomed cylindrical shape in which the inner diameter of the opening is equal to or larger than the outer diameter of the parent die and the outer diameter is equal to or smaller than the diameter of the charge hole. Therefore, it is possible to easily attach the protective cap to the parent die.

  Furthermore, the protective cap has an inner peripheral surface tapered so that the inner diameter of the opening is larger than the inner diameter of the bottom, and the inner diameter of the bottom of the protective cap is from −5% to the outer diameter of the parent die. The range is set to + 10%. Therefore, the protective cap can be attached to the parent die more smoothly and can be made difficult to drop off after the attachment.

  In the protective cap of the second invention, the inner diameter of the opening is equal to or greater than the outer diameter of the parent die with a detonator, and the outer diameter is equal to or smaller than the charge hole diameter, and is mounted on the detonator side of the parent die with a detonator. The protective cap is configured to protect the connected leg wire or the conduit, and the protective cap has an inner peripheral surface tapered so that the inner diameter of the opening is larger than the inner diameter of the bottom. The inner diameter of the bottom of the cap is set in the range of -5% to + 10% with respect to the outer diameter of the parent die. Therefore, the protective cap is used by being attached to the parent die, and the effects of the first invention can be exhibited.

  In the method for loading explosives of the third invention, the parent die is attached to the tip of the loading pipe or loading hose and inserted into the charge hole, and the explosive is mechanically loaded. It is performed in a state where it is attached to the tip of the loading hose. Since the parent die is covered with the protective cap having the above-described effects, damage to the detonator leg wire or the fire tube when the machine is loaded can be sufficiently suppressed.

The principal part sectional drawing which shows typically the state which loads the parent die with a protective cap in a charge hole. Sectional drawing which shows a protective cap. Sectional drawing which shows the relationship between a protective cap and a loading pipe or a loading hose. The side view which shows the parent die with a protective cap which provided the slit in the protective cap. The side view which shows the parent die with a protective cap which provided the circular hole with a slit in the protective cap.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments that are considered to be the best of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view of a main part schematically showing a state in which a parent die with a protective cap is loaded into a charge hole. As shown in FIG. 1, a charge hole 12 drilled in a rock mass 11 has a distal end. A loading pipe or loading hose 14 having a parent die 13 with a protective cap attached thereto is inserted. The protective cap 15 is attached so as to cover the detonator 17 side of the parent die 16. A leg wire or a light guide tube 18 connected to the detonator 17 of the parent die 16 passes through a gap 19 between the protective cap 15 and the parent die 16, and the tip of the protective cap 15 and the loading pipe or loading hose 14. It is taken out from the gap 20 between them. That is, the leg wire or the fire guide pipe 18 is protected by the protective cap 15 on the distal end side of the parent die 16 on the insertion side, which is easily damaged. In addition, the outer diameter of the leg wire or the light guide pipe 18 is usually about 1 to 3 mm. The leg wire is, for example, an insulation coating applied to a copper wire, igniting an igniting agent by energization to detonate the detonator, and the igniting tube is, for example, thinly applied with an explosive in a plastic tube, igniting and burning It propagates and detonates the detonator.

The protective cap 15 is formed in a bottomed cylindrical shape, and the inner diameter thereof (the inner diameter (d ₁ ) on the opening 15c side and the inner diameter (d ₂ ) on the bottom 15b side) is equal to or larger than the outer diameter (D) of the parent die 16; The outer diameter (d ₃ ) is set to be equal to or less than the charge hole diameter (t). Since the charging hole 12 is formed by drilling the rock mass 11 with a bit having a predetermined diameter, the charging hole diameter (t) corresponds to the diameter of the bit. However, the charge hole 12 is affected by the condition of the rock mass, joints, etc. and is not a uniform hole, so some error occurs. In order to avoid easy insertion into the charging hole 12 and damage to the leg wire or the heat guide pipe 18, the outer diameter (d ₃ ) of the protective cap 15 should be set to be 5 mm or more smaller than the charging hole diameter (t). Is preferred.

  Explosives are accommodated in the parent die 16, and as such explosives, cartridge type industrial explosives packaged with dynamite, water-containing explosive paper or synthetic resin are used. The protective cap 15 is formed in a bottomed cylindrical shape, usually a bottomed cylindrical shape, but can be used even if the design is changed as long as the bottomed cylindrical shape can protect the detonator 17 side of the parent die 16. The material of the protective cap 15 is preferably a soft material such as a resin, and as such a soft material, rubber usually used in this field is most preferable, and then a resin is preferable. As the rubber, for example, various natural rubbers, synthetic rubbers and the like are used, and as the resin, a synthetic resin alone such as polyvinyl chloride, polyethylene, polypropylene, or a composite material thereof is used. The metal is not preferable because it may cause a spark due to friction with the hole wall or the gap of the charge hole 12, but it can also be used in a part without such a fear.

  The resin as the soft material can absorb an excessive force applied when the parent die 16 is loaded into the charge hole 12. Moreover, carbon black and an antistatic agent may be blended with the resin as necessary to prevent charging near the detonator 17. When manufacturing the protective cap 15 from these materials, it is performed according to a conventional method by a molding method such as an injection molding method, a compression molding method, an extrusion molding method, or a dip molding method.

As shown in FIG. 2, the protective cap 15 is formed in a bottomed cylindrical shape from a cylindrical portion 15a formed in an elongated cylindrical shape and a bottom portion 15b provided at one end thereof. In order to facilitate the mounting of the protective cap 15 on the parent die 16, the inner peripheral surface thereof is a tapered portion 15d so that the inner diameter (d ₁ ) of the opening 15c is larger than the inner diameter (d ₂ ) of the bottom 15b. is there. In that case, the inner diameter (d ₂ ) of the bottom 15 b of the protective cap 15 is set in the range of −5% to + 10% with respect to the outer diameter (D) of the parent die 16 and the inner diameter of the opening 15 c of the protective cap 15. (D ₁ ) is set larger than the outer diameter (D) of the parent die 16. That is, the relational expression of the inner diameter (d ₁ ) of the opening 15 c of the protective cap 15> the inner diameter (d ₂ ) of the bottom 15 b of the protective cap 15 is satisfied. With this configuration, the protective cap 15 can be easily attached to the parent die 16 and can be firmly in contact with the parent die 16 after being attached, so that the protective cap 15 cannot be easily detached. When the inner diameter (d ₂ ) of the bottom 15 b of the protective cap 15 is smaller than −5% with respect to the outer diameter (D) of the parent die 16, it is difficult to attach the protective cap 15 to the parent die 16. On the other hand, if it is larger than + 10%, the gap becomes too large even if a detonator with a light guide tube is used, and the protective cap 15 is easily detached from the parent die 16 after the protective cap 15 is attached to the parent die 16.

  The length (depth) (L) of the protective cap 15 is 0.5 to 3 times the outer diameter (D) of the parent die 16 in order to fully express the function of protecting the parent die 16 by the protective cap 15. It is preferable that When the length (L) of the protective cap 15 is less than 0.5 times the outer diameter (D) of the parent die 16, the protective cap 15 becomes too short and the protective cap 15 is easily detached from the parent die 16. It is not preferable. On the other hand, when it exceeds 3 times, the protective cap 15 tends to be too long and it takes time to attach the protective cap 15 to the parent die 16.

Moreover, it is preferable to design so that the maximum part of the outer diameter (d ₃ ) of the protective cap 15 is larger than the inner diameter (s ₁ ) of the loading pipe or loading hose 14. More specifically, as shown in FIG. 3, the relational expression of the maximum value of the outer diameter (d ₃ ) of the protective cap> the inner diameter (s ₁ ) of the loading pipe or loading hose 14 is satisfied. With such a configuration, there is no fear that the parent die 13 with the protective cap attached to the tip of the loading pipe or loading hose 14 will not enter the loading pipe or loading hose 14 and perform normal loading work. is there.

Furthermore, as shown in FIG. 3, it is preferable to design the maximum portion of the outer diameter (d ₃ ) of the protective cap 15 to be smaller than the outer diameter (s ₂ ) of the loading pipe or loading hose 14. That is, the relational expression of the maximum value of the outer diameter (d ₃ ) of the protective cap 15 ≦ the outer diameter (s ₂ ) of the loading pipe or loading hose 14 is satisfied. With this configuration, when the parent die 16 is loaded into the charge hole 12, the overhang of the protective cap 15 from the loading pipe or the loading hose 14 can be eliminated, so that the loading operation can be performed smoothly. In addition, it is possible to avoid applying an excessive load to the parent die 16.

In addition, the outer diameter (d ₄ ) of the opening 15c of the protective cap 15 <the end of the loading pipe or the loading hose so that the opening 15c side of the protective cap 15 is smoothly attached to the loading pipe or the loading hose 14. An inclined surface 15e may be provided on the outer surface on the opening 15c side of the protective cap 15 so as to satisfy the relational expression of the inner diameter (s ₁ ). In this case, the outer diameter (d ₄ ) of the opening 15 c of the protective cap 15 is equal to the inner diameter (d ₁ ) of the opening 15 c of the protective cap 15. By comprising in this way, attachment of parent die 13 with a protective cap to loading pipe or loading hose 14 can be made easier.

  Subsequently, it is desirable to provide a guide portion for guiding the leg wire or the fire guide pipe 18 to the outside of the protective cap 15 on the opening 15 c side of the protective cap 15. The shape of the guide portion may be any shape as long as the leg wire or the heat guide pipe 18 can be guided outward. For example, the slit 21 as the guide portion as shown in FIG. It can be set as the circular hole 22 with a slit as a guide part as shown in FIG. As long as the slit 21 shown in FIG. 4 has a shape in which the leg wire or the fire guide pipe 18 can be introduced from the edge of the opening 15 c of the protective cap 15, the width and the cutting depth can be arbitrarily set. For example, if the material of the protective cap 15 is an elastic material such as rubber, even a simple cut functions sufficiently.

  Further, the slit-equipped circular hole 22 shown in FIG. 5 is formed by opening a circular hole at the tip of the slit 21. For example, an elastic material such as rubber is used as the material of the protective cap 15, the slit 21 has a cut width smaller than the diameter of the introduced leg wire or the light guide pipe 18, and the diameter of the circular hole portion is introduced. What is necessary is just to form larger than the diameter of the wire or the heat guide tube 18. In this case, at the time of introduction to the slit portion, if the slit portion is introduced so as to be spread and led to the circular hole portion, the leg wire or the fire guide pipe 18 is not returned to the edge of the protective cap 15, Can be maintained and the state can be maintained.

  By configuring in this way, it is possible to avoid the leg wire or the light guide pipe 18 being sandwiched between the tip of the loading pipe or the charging hose 14 and the hole wall of the charge hole 12. Damage can be further suppressed. 4 and 5, the protective cap 15 is formed in a bottomed cylindrical shape in which the tapered portion 15d is not formed on the inner periphery of the cylindrical portion 15a, and the parent die 16 is formed on the inner peripheral surface of the protective cap 15. The outer peripheral surface of is closely attached.

Next, a method of loading the parent die 13 with a protective cap into the charge hole 12 will be described. First, the protective cap 15 described above is attached to the parent die 16 to form the parent die 13 with a protective cap. At this time, the protective cap 15 is set so that the inner diameter (d ₁ ) of the opening is equal to or larger than the outer diameter (D) of the parent die 16 and the outer diameter (d ₃ ) is equal to or smaller than the charging hole diameter (t). The mounting to the parent die 16 is easy, and the insertion into the charging hole 12 is also easily performed. Next, the parent die 13 with a protective cap is attached to the tip of the loading pipe or loading hose 14. At this time, the maximum part of the outer diameter (d ₃ ) of the protective cap 15 is formed to be larger than the inner diameter (s ₁ ) of the loading pipe or loading hose 14 and from the outer diameter (s ₂ ) of the loading pipe or loading hose 14. The small die can be smoothly attached to the top end of the loading pipe or loading hose 14 with the protective cap 13. After that, the loading pipe or loading hose 14 to which the parent die 13 with the protective cap is attached is inserted into the charging hole 12 and charged at the bottom of the hole, and then the explosive serving as the additional die is transferred to the charging hole 12. Loaded.

  In this case, the mechanical loading is performed by, for example, putting a granular explosive such as an ANFO explosive (a nitric acid explosive explosive) into a storage hopper and pneumatically feeding it into the charging hole 12 through a loading pipe or a loading hose 14 or a cartridge type explosive. Is loaded into the charging hole 12 via a loading pipe or loading hose 14 or a fluid bulk explosive explosive is loaded via a loading pipe or loading hose 14 using a pump such as a Mono pump. This is performed by a method of directly loading the medicine hole 12 or the like. As described above, loading of the explosive into the charge hole 12 is preferably performed by mechanical loading, but can be performed by manual loading.

The effects exhibited by the above embodiment will be described collectively below.
In the parent die 13 with the protective cap of the present embodiment, the protective cap 15 is attached to the parent die 16 so as to cover the detonator 17 side, and is configured to protect the leg wire or the fire guide tube 18. By covering the parent die 16 with the protective cap 15, it is possible to sufficiently prevent the leg wire or the fire guide pipe 18 from being slid and damaged by the hole wall or the gap of the charging hole 12 when the machine is loaded. Can do. Further, the protective cap 15 is set such that the inner diameter (d ₁ ) of the opening is equal to or larger than the outer diameter (D) of the parent die 16 and the outer diameter (d ₃ ) is equal to or smaller than the charge hole diameter (t). . Therefore, the protective cap 15 can be easily attached to the parent die 16.

The protective cap 15 has an inner peripheral surface formed in the tapered portion 15d so that the inner diameter (d ₁ ) of the opening 15c is larger than the inner diameter (d ₂ ) of the bottom 15b. At the same time, the inner diameter (d ₂ ) of the bottom 15 b of the protective cap 15 is set in the range of −5% to + 10% with respect to the outer diameter (D) of the parent die 16. In this case, the protective cap 15 can be attached to the parent die 16 more smoothly.

  By providing guide portions such as a slit 21 and a slit-shaped circular hole 22 for guiding the leg wire or the fire guide pipe 18 to the outside of the protective cap 15 on the opening 15c side of the protective cap 15, the leg wire or Damage to the fire guide pipe 18 can be effectively suppressed.

In the protective cap 15, the inner diameter (d ₁ ) of the opening is equal to or larger than the outer diameter (D) of the parent die 16 and the outer diameter (d ₃ ) is equal to or smaller than the charging hole diameter (t). Is mounted on the side of the detonator 17 and is configured to protect the leg wire or the light guide tube 18. In this case, the protective cap 15 is used by being attached to the parent die 16, and the effect of the parent die 13 with the protective cap can be exhibited.

  In the loading method of the parent die 13 with the protective cap, the parent die 16 is attached to the tip of the loading pipe or loading hose 14 and inserted into the charge hole 12, and the explosive is mechanically loaded. 13 is carried out in a state where it is attached to the tip of the loading pipe or loading hose 14. In this loading method, since the protective cap 15 having the above-described effect is put on the parent die 16, damage to the leg wires or the fire guide pipe 18 during machine loading can be suppressed. Therefore, this loading method is suitably used in the civil engineering construction field such as tunnel blasting excavation work, the mining and industrial field such as quarrying and mining, and the agricultural and forestry field such as irrigation and clearing.

Hereinafter, the embodiment will be described more specifically with reference examples and comparative examples. In addition, the measurement of the presence or absence of damage to the leg wire was performed by the following method.
(Measurement of damage to leg wires)
Attach a parent die 16 (using a medicine package with an outer diameter D of 30 mm and a mass of 150 g) 16 equipped with an electric detonator at the tip of the loading pipe (outer diameter (s ₂ ) is 38 mm, inner diameter (s ₁ ) is 35 mm) Insert into the deepest part of the charge hole (1.5 mm depth with a 45 mm diameter bit, the charge hole diameter (t) is substantially 45 mm) and charge the parent die 16 with the detonator 17. The hole 12 was loaded. After loading, the parent die 16 was collected, and the presence or absence of damage to the leg wire was measured by measuring the continuity of the electric detonator attached to the parent die 16 and visually observing the leg wire. The measurement results were evaluated in the following two stages.

○ mark: No damage to the leg wire sheath of the electric detonator, or damage to the internal copper wire is not exposed.
X mark: The state where the leg wire covering is damaged and the internal copper wire is exposed or the leg wire is cut.
(Reference Example 1)
The protective cap 15 is made of natural rubber having a minimum inner diameter (d ₁ , d ₂ ) of 30 mm, a maximum outer diameter (d ₃ ) of 36 mm, and a length (L) of 50 mm, and has a bottomed cylindrical shape It was used. Then, after the protective cap 15 was attached to the parent die 16 equipped with an electric detonator, the presence or absence of damage to the leg wires was measured. As a result, 98 out of 100 were ○, and the remaining 2 were × (no breakage occurred, and there was no problem even if used).
(Reference Example 2)
A protective cap 15 provided with a slit 21 as a guide portion having a length of 10 mm is attached to the parent die 16 in the opening 15c of the protective cap 15 described in Reference Example 1, and the leg wire is taken out from the slit 21 after mounting, The presence or absence of damage to the leg wire was measured. As a result, 100 out of 100 were ◯.
(Comparative Example 1)
Without using the protective cap 15, an electric detonator was attached to the explosive sachet, and then a tie portion by a leg wire was formed at a position 5 cm from the attachment side to produce a parent die. And when the presence or absence of the damage of the said leg wire was measured, 52 in 100 times were (circle), and the remaining 48 were x (three were cut | disconnected states of one or both copper wires).

In addition, this embodiment can also be changed and embodied as follows.
The inner peripheral surface of the cylindrical portion 15 a of the protective cap 15 can be formed in an uneven shape so that the engaging force with the outer peripheral surface of the parent die 16 can be increased.

-It is also possible to provide a plurality of guide portions for guiding the leg wire or the fire guide pipe 18 to the outside of the protective cap 15.
-It is also possible to make the said circular hole 22 with a slit into a circular hole without a slit.

A guide groove for guiding the leg wire or the fire guide pipe 18 may be formed on the inner surface of the cylindrical portion 15a or the bottom portion 15b of the protective cap 15.
Further, the technical idea that can be grasped from the embodiment will be described below.

  The parent die with a protective cap according to claim 1, wherein the protective cap is formed in a bottomed cylindrical shape. When comprised in this way, in addition to the effect of the invention which concerns on Claim 1, the function of a protective cap can be improved.

  The parent die with a protective cap according to claim 1, wherein the protective cap is made of a soft material. When constituted in this way, in addition to the effect of the invention according to claim 1, it is possible to more easily attach the protective cap to the parent die.

  The parent die with a protective cap according to claim 1, wherein the length of the protective cap is 0.5 to 3 times the outer diameter of the parent die. When comprised in this way, in addition to the effect of the invention which concerns on Claim 1, the function which protects a parent die with a protective cap can fully be exhibited.

  The maximum part of the outer diameter of the protective cap is formed larger than the inner diameter of the loading pipe or the loading hose and smaller than the outer diameter of the loading pipe or the loading hose. Parent die with protective cap. When constituted in this way, in addition to the effect of the invention according to claim 1, it is possible to smoothly perform the loading operation into the charge hole of the parent die with the protective cap and to give an excessive load to the parent die. Can be avoided.

  The guide portion for guiding the leg wire or the fire guide pipe to the outside of the protective cap is provided on the opening side of the protective cap, and the guide portion is a slit or a hole. Parent die with protective cap. In this case, in addition to the effect of the invention according to claim 1, the vicinity of the mounting portion of the detonator on the insertion side into the charge hole which is more easily damaged is protected, and the tip of the loading pipe or the loading hose is protected. Since it is possible to prevent the leg wire or the guide tube from being sandwiched by the portion, the hole wall, or the gap, damage to the leg wire or the guide tube of the detonator can be more effectively suppressed. Furthermore, it is possible to suppress the leg wire or the light guide tube from being sandwiched between the loading pipe or the loading hose and the protective cap by the guide portion. In addition, the guide portion can be easily formed, and the leg wire or the fire guide tube can be easily guided to the outside of the protective cap.

  In the loading method in which the parent die is attached to the tip of the loading pipe or loading hose and inserted into the charge hole, and the explosive is mechanically loaded, the parent die with a protective cap according to claim 1 is attached to the tip of the loading pipe or loading hose. A method for loading a parent die with a protective cap, which is performed in an attached state. According to this method, since the parent die is covered with the protective cap having the above-described effect, damage to the detonator leg wire or the fire tube when the machine is loaded can be sufficiently suppressed.

  12 ... Charge hole, 13 ... Parent die with protective cap, 14 ... Loading pipe or hose, 15 ... Protection cap, 15b ... Bottom, 15c ... Opening, 15d ... Tapered portion, 16 ... Parent die, 17 ... Detonator, 18: Leg wire or conduit, d1: Inner diameter of protective cap opening, d2: Inner diameter of protective cap bottom, d3: Outer diameter of protective cap, D: Outer diameter of parent die, t: Charging hole diameter.

Claims (3)

A bottomed cylindrical protective cap whose inner diameter is greater than or equal to the outer diameter of the parent die and whose outer diameter is less than or equal to the charge hole diameter is mounted over the detonator side of the parent die and connected to the detonator The protective cap is configured to protect the leg wire or the conduit, and the inner surface of the protective cap is tapered so that the inner diameter of the opening is larger than the inner diameter of the bottom. A parent die with a protective cap, characterized in that the inner diameter is set in a range of -5% to + 10% with respect to the outer diameter of the parent die. A protective cap used for a parent die with a protective cap according to claim 1, wherein the inner diameter of the opening is equal to or larger than the outer diameter of the parent die and the outer diameter is equal to or smaller than the charge hole diameter, and the detonator of the parent die with a detonator The protective cap is configured to protect the leg wire or the conduit that is connected to the detonator, and the inner surface of the protective cap is such that the inner diameter of the opening is larger than the inner diameter of the bottom. A protective cap characterized in that it is formed in a taper shape and the inner diameter of the bottom of the protective cap is set in the range of -5% to + 10% with respect to the outer diameter of the parent die. A loading method for mechanically loading an explosive into a charge hole, wherein the parent die with a protective cap according to claim 1 is attached to a tip of a load pipe or a load hose and loaded into the charge hole, and the explosive is loaded. How to load explosives.

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