JPS6223784Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to an electric detonator that is safe against static electricity. More specifically, in an electric detonator in which an insulating resin embolus 1 in which an insulating cylindrical resin 6 and leg wires 2 are embedded in a tube body 5, the embolus 1
A part of the insulating sheathing material 2 of the leg wire protruding outside the embolus 1 so as to form an electric circuit with the leg wire core wire 4 inside the embolus 1, the insulating sheathing material 2 of the leg wire inside the embolus 1 and the core wire 4. This is an anti-static detonator with a part continuously coated with conductive paint. When a conventional electric detonator is used in a place where high-voltage static electricity is generated, a discharge occurs between the platinum wire 8 or the leg core wire 4 of the platinum wire portion and the tube body 5, igniting the surrounding explosives 7. , there is a risk that the detonator may explode. In order to prevent electrical discharge between the platinum wire 8 or the leg core wire 4 of the platinum wire portion and the tube body 5, an insulating cylindrical resin 6 is used.
However, since the insulating resin embolus 1 and the insulating cylindrical resin 6 are mechanically connected, when the static electricity voltage reaches 5KV, the insulating resin embolus 1 and the insulating cylindrical resin It is also dangerous because the detonator may explode because the discharge passes through the joint 9 with the tube 5 and causes the detonator to explode. In order to eliminate this danger, the present invention provides an insulating cylindrical resin 6 and a conductive paint 3 to remove the static electricity applied to the leg core wire 4 by forming an electric circuit with the core wire. The purpose is to prevent the detonator from exploding due to static electricity by discharging it to the tube end face 5' through the conductive paint 3' protruding outside the resin embolus 1. As the conductive paint 3, a conductive paint coated with a synthetic resin viscosity agent mixed with graphite, metal powder, etc. can be used. Recently, as an example of the structure of an antistatic detonator, there is a method in which a conductive resin molded part is provided around the core wire, and an insulating resin part with an opening is molded around the outer periphery of the conductive resin molded part. However, it has the disadvantage that it is complicated to mold twice. The present invention solves this difficulty and has great industrial value because it is sufficient to simply apply conductive paint to the leg lines. The conductive paint according to the present invention becomes a coating film after application,
No problems occur when molding the insulating resin embolus. Next, an example showing the effect of applying a conductive paint will be shown. Sample A is a sample coated with a conductive paint according to the present invention, and sample B is a sample without a conductive paint coated thereon. Note that both samples A and B are equipped with an insulating cylindrical resin. Sample C is an electric detonator in which no insulating cylindrical resin is installed and no conductive paint is applied. The test method involved charging a capacitor with a capacitance of 2000 PF with static electricity and applying the static electricity to the sample.

[Table] The denominator indicates the number of samples and the numerator indicates the number of explosions.
From the above example, sample B exploded at 5KV, while sample A did not explode at 15KV, demonstrating the effectiveness of the conductive paint.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an electric detonator showing one example of the present invention. DESCRIPTION OF SYMBOLS 1... Insulating resin embolus, 1'... End face of insulating resin embolus, 2 ... Leg line, 2... Insulating coating, 3...
... Conductive paint, 4 ... Leg core wire, 5 ... Pipe body,
5'... Tube end surface, 6... Insulating cylindrical resin, 7...
...Explosives, 8...Platinum wire, 9...Bonding surface of 1 and 6.

Claims (1)

[Scope of utility model registration request] In an electric detonator that has an insulating resin embolus with an insulating cylindrical resin and leg wires embedded inside the tube,
A part of the insulating coating of the leg wire protruding outside the embolus, and a part of the insulating covering material of the leg wire and the core wire inside the embolus so as to form an electric circuit with the leg core wire inside the embolus. Anti-static detonator with continuous conductive coating.