Primacord rolling method and primacord rolling machine

A technology of detonating cord and rolling mill, which is applied in the direction of metal rolling, metal rolling, rolling, etc., can solve the problems of no detonating cord, safety problems, large resistance, etc., and achieve a good market competitive advantage and uniform charge density , the effect of small temperature rise

Inactive Publication Date: 2006-12-27
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing ordinary rolling mills are usually used to roll steel plates. When rolling, the resistance is large and a large amount of heat will be generated. It cannot be directly used to squeeze and roll the detonating cord, otherwise it may explode and cause safety problems.
[0005] So far, there is no report on the production of detonating cord by extrusion and rolling

Method used

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  • Primacord rolling method and primacord rolling machine
  • Primacord rolling method and primacord rolling machine
  • Primacord rolling method and primacord rolling machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: Rolling lead skin detonating cord with variable diameter roll mill

[0023] In this embodiment, a lead pipe with an inner diameter of 16 mm and an outer diameter of 20 mm is used as the charge blank tube of the passivated explosive.

[0024] Determination of the mass ratio and density of passivated explosives: Because RDX has high viscosity and poor fluidity, it is necessary to add binders to change its physical state, enhance fluidity for easy operation and processing, and at the same time ensure stable detonation. After a large number of experiments, it is advisable to select a mass ratio of 90-98% of RDX and 10-2% of the binder, fully bond and mix evenly in a bowl, and use the prepared passivated explosive From the open end downward, according to the volume and packing density of the blank tube, it is 0.6-1.0g / cm 3 According to the requirements within the range, weigh the passivated explosives, quantitatively load them into the blank tube, keep the cha...

Embodiment 2

[0055] Embodiment 2: Rolling high-pressure polyethylene plastic detonating cord by variable-diameter roll rolling machine

[0056] When the soft blank tube adopts a non-metallic tube, explosives can be continuously loaded into the thick tube during the tube forming process of the non-metallic tube; when the blank tube is made of plastic or heat-deformable material, it is necessary to heat the source and heat preservation in the process measure.

[0057] In this embodiment, a high-pressure polyethylene plastic pipe with an inner diameter of 10 mm and an outer diameter of 14 mm is used as the charge blank pipe of the passivated explosive. The high security high explosive is packed in the prefabricated thick tube.

[0058] The specific steps of this embodiment are as follows:

[0059] Dispensing: the mass ratio is 98% of RDX and 2% of binder;

[0060] Charge: One end of the polyethylene plastic billet tube is closed and the other end is open, and the passivation explosive is q...

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Abstract

The invention relates to a primacord rolling method and primacord rolling machine, characterized in that passivation explosive material of 90-98% Hexogen(RDX) and 10-2% bonding agent are agglutinating and mixing evenly, and is cased into a one-end sealed soft blank pipe, to form granular structure with stacking density of 0.6-1.0 g/cm3. Then blank pipe opening is sealed, and the pipe is put into a cannelure matched with the desired pipe rolling diameter between a pair of roller flanges of the primacord rolling machine. The blank pipe is continuously passing multiple roller pairs of which the diameter is gradually decreased, and the decrease ratio of the diameter of blank pipe is less than 50%, until achieve the design requirement of the primacord product diameter. The length of primacord rolled by this method and equipment can be more than 200 metres. High safety can be assured during production process without any environmental pollution. Product quality is stable, and the wire loading density can be flexibly adjusted to meet the desire of different usages, good market competition advantage is provided.

Description

Technical field: [0001] The invention belongs to the technical field of detonating cord production, in particular to a method for producing detonating cord by a rolling method and a detonating cord rolling mill thereof. Background technique: [0002] According to China Coal Industry Press "Mine Detonating Materials" (published in 1978, pages 371-378), the traditional production process of the common detonating cord that has been used up to now is: first wrap it with cotton yarn or chemical fiber through special equipment Explosives, then coated with hot bitumen, kraft paper wrap or thermoplastic coating to form a waterproof layer. This process has low single-machine production capacity, high noise, high production cost, and large fiber dust and explosive dust; due to the use of a large amount of cotton yarn and chemical fiber multi-layer wrapping, the core explosive has low density and poor uniformity, and the quality and detonation velocity of the detonating cord Not easy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/16B21B1/18B21B27/02
Inventor 沈兆武梅群周听清沈国新
Owner UNIV OF SCI & TECH OF CHINA
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