Chemical detonator with electric trigger

Abstract

The necessary ESD safety for chemical detonators 1 is ensured by the fact that the sleeve 2 of the chemical detonator 1 is closely encompassed by an aluminum sleeve 20, the ignition pill 5 is sealed in addition by a casting compound 21 and a predetermined flashover position 26 is provided for the priming wires 3, 4.

Claims

1. Chemical detonator comprising a sleeve (2) consisting of plastic that holds both an ignition pill (5) connected with priming wires (3, 4), a primer composition and an incendiary agent as well as a pyrotechnic substance (8) and is sealed towards a sleeve outlet (9) with a stopper (10) and towards a sleeve inlet (11) with the priming wires (3, 4) through the ignition pill (5), wherein the sleeve (2) is surrounded by a tight fitting aluminum sleeve (20) and the ignition pill (5) is sealed against a funnel-shaped tapering inside wall (23) of the sleeve (2) with a casting compound (21).

2. Chemical detonator in accordance with claim 1, wherein a predetermined flashover position (26) is provided in an area of connection (25) between the priming wires (3, 4) and the ignition pill (5).

3. Chemical detonator in accordance with claim 1, wherein the stopper (10) has a predetermined breaking point (27).

4. Chemical detonator in accordance with claim 1, wherein wadding (28) is provided between the stopper (10) and pyrotechnic substance (8).

5. Chemical detonator in accordance with claim 4, wherein the wadding (28) between the stopper (10) and the pyrotechnic substance (8) is made of absorbent paper.

6. Chemical detonator in accordance with claim 1, wherein the casting compound is an adhesive.

7. Chemical detonator in accordance with claim 1, wherein the stopper (10) has a color that identifies the energy level class of the respective detonator (1).

8. Chemical detonator in accordance with claim 1, wherein the priming wires (3, 4) are made of copper-plated, tin-plated or galvanized iron or of copper and have a PVC insulation (32).

9. Chemical detonator in accordance with claim 1, further comprising an attachment (34) to the sleeve (2) for extending the sleeve (2) to higher energy level through the attachment (34), whereby the sleeve (2) and the attachment (34) are surrounded by a continuous aluminum sleeve (35).

10. Chemical detonator in accordance with claim 6, wherein the casting compound is a two-component epoxy resin adhesive.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows an open view of a chemical detonator,

(2) FIG. 2 shows the detonator in accordance with FIG. 1 in a side view,

(3) FIG. 3 shows a top view of the detonator with stopper,

(4) FIG. 4 shows a cross-section of a detonator in a high energy level class, and

(5) FIG. 5 shows a side view of the corresponding detonator.

DETAILED DESCRIPTION OF THE INVENTION

(6) The chemical detonator 1 shown in FIG. 1 is one in energy level class 10,000 Ws. The funnel-shaped sleeve 2 tapering in the direction of the priming wires 3, 4 accommodates the ignition pill 5 in the area of the funnel, whereby the ignition pill 5 or its pill head 7 into which the space 15 accommodating the pyrotechnic substance 8 projects, while the pill foot 6 is fixed in place through the casting compound 21 in the bottom 14 and at the same time sealed.

(7) From the funnel 22 of the sleeve 2 the sleeve runs with a smaller diameter to the sleeve inlet 11. In this area, openings 12 are provided for the priming wires 3, 4, whereby the priming wires 3, 4 are fixed by clamps 13 on the pill foot 6 of the ignition pill 5. There is a predetermined flashover position 26 here as well, which has the task of ensuring potential equalization if corresponding dangers exist.

(8) An adhesive, in particular a two-component epoxy resin adhesive, is used for the casting compound 21 that is compatible both with the material of the inside wall 23 of sleeve 2 and with the material of pill foot 6 and/or provides the desired sealing function.

(9) At the opposite end, i.e. the sleeve outlet 9, there is a stopper 10 that in the same way as the described casting compound 21 ensures that the pyrotechnic substance 8 stored in space 15 can be stored leak-proof and safely. The stopper 10 has a predetermined breaking point 27, so that it is ensured that if the pyrotechnic substance 8 reacts, the flame and/or the pressure can escape to the outside and be effective. The stopper 10 is placed from above on the sleeve 2 and seals as described as well as it does because it is secured as well by the aluminum sleeve 20 surrounding the sleeve 2. The aluminum sleeve 20 is drawn up into the area of the actual cover of the stopper 10.

(10) This aluminum sleeve 20 surrounds the whole of the sleeve 2 from the sleeve inlet 9 to the sleeve outlet 11. The same is shown in FIG. 2 as well. Only the priming wires 3, 4 project below beyond the sleeve 2. They are connected to the blasting machine or to an otherwise suitable appliance.

(11) The priming wires 3, 4 made of copper or appropriate iron wire are designed so that the appropriate priming wire core 30 is surrounded by a priming wire sheath 31, whereby PVC insulation 32 is to be preferred for this priming wire sheath 31.

(12) As mentioned above, a predetermined flashover position 26 is provided in the area of the connection 25 between the priming wires 3, 4 and the clamp 13 of the ignition pill 5, which is made clear in FIG. 1. Wadding 28 is provided at the stopper 10, or rather at the insert 16, which consists of absorbent paper and is supported from underneath on the insert 16 and ensures that this area is sealed in addition towards the outside.

(13) FIG. 3 shows a top view onto a sleeve 2, whereby the aluminum sleeve 20 is identifiable as the outer sheath that tightly encloses the actual sleeve 20. This sleeve 2 is sealed from sides of the sleeve outlet 9 by the stopper 10.

(14) FIG. 4 shows a construction that is identical to the construction in FIG. 1 with regard to ignition pill 5 and the arrangement and/or conduction of the priming wires 3, 4. However, space 15 has been clearly enlarged in comparison with the design shown in FIG. 1. This is achieved with an attachment 34, which is placed from above on the sleeve inlet 9 and then supports the connection stopper 10 at the opposite end. The predetermined breaking point 27 and the wadding 28 can be identified here as well.

(15) The plug-in end 36 of the attachment 34 reaches so far into the old sleeve 2 that the whole sleeve is given the necessary stability. This stability is supported in addition in that both the attachment 34 and the old sleeve 2 are surrounded by a long continuous aluminum sleeve 35. The chemical detonator 1 shown here is intended for energy level class 20,000 Ws. FIG. 5 illustrates that the continuous aluminum sleeve 35 creates a continuous protective sheath.

(16) All the named features, including those than can be seen solely in the drawings, are regarded by themselves and in combination as fundamental to the invention.