CN2341988Y

CN2341988Y - Composite sandwich type high-strength detonating tube

Info

Publication number: CN2341988Y
Application number: CN 98230427
Authority: CN
Inventors: 曹晓宏; 杨斌林; 孙伯文; 卜庆友; 陈士江
Original assignee: Yinguang Chemical Group Co ltd; Changsha Institute of Mining Research Co Ltd
Current assignee: Yinguang Chemical Group Co ltd; Changsha Institute of Mining Research Co Ltd
Priority date: 1998-04-01
Filing date: 1998-04-01
Publication date: 1999-10-06
Anticipated expiration: 2008-04-01

Abstract

A composite sandwich type high-strength detonating tube for engineering blasting belongs to a tubular detonating device. The explosion-proof detonator is composed of an explosion-conducting agent, inner layer plastic, an interlayer and outer layer plastic, and is characterized in that the interlayer is embedded between the inner layer plastic and the outer layer plastic to enhance the tensile strength and the bending strength of the explosion-proof detonator, the tensile strength of the explosion-proof detonator can reach more than 20kg, and the explosion-proof detonator has the characteristics of low raw material cost and simple production process. The utility model discloses a but the product wide application is in medium-length hole blasting engineering.

Description

Composite intermediate layer formula high strength primacord

The utility model relates to a kind of tubulose boosting explosive material in the engineering explosion.

Plastic detonating tube does not produce characteristics such as vibrations, networking is convenient, security is good and is widely used in the engineering explosion because of its anti-stray electrical and static in the propagation of explosion process.But the stretching resistance of common plastics primacord has only below the 5kg, and anti-bending performance is poor, causes miss-firing at the on-the-spot subject to damage of explosion.Along with no cap-sensitivity bulk explosives applying in the medium-length hole blasting engineering, require to transmit detonate can initiating equipment have strong, the anti-bending of stretching resistance, the characteristics of cracky and heatproof not, and loading wire of electric detonator and common plastics primacord fuse all do not meet above-mentioned requirements; Though industrial detonating fuse can satisfy above-mentioned requirements, in its propagation of explosion process bulk explosives in the hole is had destruction, and the cost height.The characteristics that the high strength primacord has that cost is low, surrounding medium (comprising explosive in the hole) is had no effect in the safety, propagation of explosion process, but currently available products exists or tensile strength is not enough, or complex manufacturing, the problem that cost is too high.Since the eighties, develop several high strength primacords both at home and abroad in succession: the first kind is an individual layer high strength primacord, as primacord as described in patent GE2215441B, the EP327219-B1, " EXEL " the novel primacord fuse that Britain ICI company produces and the YL-12 type primacord of domestic development, No. 1 high strength primacord of ruddiness electrical apparatus factory development and production all belong to this type of, its shortcoming is that stretching resistance is below the 10kg, and the anti-bending that has be cannot say for sure to demonstrate,prove or the mixing difficult control of plastics homogeneity; Second class is a double-layer plastic combined type high strength primacord, this type of primacord stretching resistance of domestic production is 8～10kg, its tensile strength is still lower, the product stretching resistance that abroad has can reach 20kg, but material cost is higher, and the described primacord such as patent CN1072132-A, WO9411324-A1, J90027312B, US4328735A, GB2027176B and the MG803-C type high temperature resistance and high strength primacord of domestic development, the high strength primacord of Hua Feng chemical plant development and production all belong to this type of; The 3rd class is the 3L type and the 3LHD type three-layer plastic compound high strength primacord of Nitro-Nobel company Development and Production under the Dyno explosive group, its inner plastic has good adhesivity to booster explosive, intercellar layer plastics has good tensile strength and erosion resistance preferably, outer layer plastic is wear-resisting and primacord is dyeed, its stretching resistance reaches 25kg at normal temperatures, superior performance, but its complex manufacturing, the material cost height.

The utility model aims to provide a kind of tensile strength height, anti-bending is good, production technique is simple, lower-cost high strength primacord.

The utility model is a composite intermediate layer formula high strength primacord, form by booster explosive 1, inner plastic 2, interlayer 3, outer layer plastic 4, by between inner plastic 2 and outer layer plastic 4, embedding strongthener, to improve the tensile strength and the anti-bending of primacord as interlayer 3.The utility model is achieved in that and adopts extrusion moulding to make inner layer plastic tube earlier, adhere to booster explosive by the prescribe medicine system at inside pipe wall simultaneously, adopt the secondary extrusion moulding on inner layer plastic tube, to apply outer layer plastic then, inner layer plastic tube is brought strongthener into when entering extrusion die, embed strongthener like this as interlayer when applying outer layer plastic, composite intermediate layer formula high strength primacord has just been produced like this.

The utility model compared with prior art, one of its distinguishing feature is tensile strength height, anti-bending, high-low temperature resistant, its stretching resistance can reach more than the 20kg at normal temperatures, can be-30 ℃～80 ℃ down reliable uses; Two of characteristics are that the cost of material is low, and used strongthener, ectonexine plastics are the Industrial materials of production in enormous quantities; Three of characteristics are that production technique is simple, only need twice extruding-out process, have not both wanted three moulding processs, also do not need to carry out mixing to plastics.

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

Fig. 1 is the synoptic diagram of first embodiment of the utility model composite intermediate layer formula high strength primacord;

Fig. 2 is the cross-sectional view of composite intermediate layer formula high strength primacord shown in Figure 1;

Fig. 3 is the synoptic diagram of another embodiment of the utility model composite intermediate layer formula high strength primacord.

Fig. 1, composite intermediate layer formula high strength primacord shown in Figure 2 are made up of booster explosive 1, inner plastic 2, interlayer 3, outer layer plastic 4, embed strongthener as interlayer 3 between inner plastic 2 and outer layer plastic 4.Inner plastic 2 should adopt the material with good adhesion, as new LDPE (film grade) etc.; Outer layer plastic 4 should adopt higher, the attrition resistant material of intensity, as high density polyethylene(HDPE) etc.; Interlayer 3 used strongtheners can be polypropylene (PP) flat filaments, polyethylene (PE) flat filament, and PP is a straight-line type with PE mixing flat filament, nylon wire, band or chemical fibre materials such as POLYAMIDE YARNS, band, the arrangement mode of the strongthener of embedding.Can produce product by twice moulding process.

Fig. 3 has provided the another kind of arrangement mode of interlayer 3 used strongtheners, adopts the mode that tiltedly twines that strongthener is wrapped on the inner layer plastic tube, applies outer layer plastic then, can produce product by twice moulding process.

Certainly, the used strongthener of interlayer 3 can also be for having heatproof, bend resistance, other materials that stretching resistance is strong, and as cotton yarn etc., the arrangement mode of strongthener also can adopt other forms, as woven etc.All these conversion all drop within the protection domain of the present utility model.

Claims

1. the composite intermediate layer formula high strength primacord that the engineering explosion of being made up of booster explosive (1), inner plastic (2), outer layer plastic (4) is used is characterized in that embedding interlayer (3) between inner plastic (2) and outer layer plastic (4).

2. composite intermediate layer formula high strength primacord according to claim 1 is characterized in that said interlayer (3) material therefor is polypropylene (PP) flat filament, polyethylene (PE) flat filament, PP and PE mixing flat filament, nylon wire, band or POLYAMIDE YARNS, band.

3. composite intermediate layer formula high strength primacord according to claim 1 and 2, the arrangement mode that it is characterized in that said interlayer (3) material therefor is straight-line type, wound form or woven.