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High-precision safety delay element

A safe and high-precision technology, used in weapon accessories, fuzes, electric fuzes, etc., can solve the problems of pressed powder density, difficult to accurately control the shape of the core, affecting the delay accuracy, etc., to achieve uniform particle density and improve delay. Accuracy and small thermal conductivity

Inactive Publication Date: 2017-01-18
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the patent of the invention is to invent a high-precision safety type in view of the difficulty in accurately controlling the pressure density and the shape of the drug core of the existing delay element, which affects the delay accuracy, and in combination with the safety requirements of the millisecond delay electric detonator delay element allowed in coal mines. delay element

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1. Control of charge density uniformity.

[0019] The material is a stainless steel round tube with an outer diameter of 3 mm and a wall thickness of 0.5 mm as a hard metal constraining layer. The material of the outer wrapping layer is lead, and the lead tube is placed on the stainless steel round tube, and the outer diameter is 6.3 after drawing. The delay constraint body of ±0.1mm is cut into 15mm length, which is the delay constraint element. Place the delay constraint element in the fixed base, put on the special inverted tapered funnel, and select the injection rod with a diameter of 2mm. The agent is lead Dan-silicon-selenium three-stage delaying drug formula, the pressure of the pressing drug is 300Mpa, the setting pressure F value of the pressing machine is calculated according to the cross-section of the ejector rod, and the mass of the delaying constraint element is weighed as m 1 , add medicine, press medicine until the height of the medicine colu...

Embodiment 2

[0023] Example 2. Delay element delay time test.

[0024] Use photoelectric testing technology to test the delay time of the above-mentioned delay elements, put the delay body into a metal tube with openings at both ends, use a special sealer to fix the sample and photoelectric sensor, display the test waveform by the oscilloscope, and read the delay of each delay element from the waveform After statistical analysis, the data shown in Table 2 were obtained.

[0025] Table 2

[0026]

[0027] The results of the above two implementation cases show that: the delay element after repeated, quantitative, and constant pressure press-fitting has good density uniformity, and the relative density deviation is 1.67%; the delay time test results show that the delay time accuracy is relatively high It is 3.210ms, and the relative range is 1.568%.

Embodiment example 3

[0028] Implementation case 3. Delay component wall temperature test.

[0029] The selected material is a thin stainless steel tube with an outer diameter of 2 mm and a wall thickness of 0.5 mm as the hard metal constraining layer. The material of the outer wrapping layer is lead, and the lead tube is placed on the stainless steel round tube, and the outer diameter is 6.3 after drawing. The delay constraint body of ±0.1mm is cut into 15mm length to become the delay constraint element. Put the delay constraint element in the fixed base, put on the special inverted cone funnel, select the diameter of 1mm to press the medicine ejector rod, and the medicine is lead red -Silicon-selenium three-stage delayed medicine formula, the pressure of the pressed medicine is 300Mpa, the set pressure F value of the medicine press is calculated according to the cross section of the ejector rod, and the height of the medicine column is equal to the height of the delayed restraint element after dos...

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Abstract

The invention relates to a high-precision safe-type delay element and belongs to parts for a delay detonator. The high-precision safe-type delay element is characterized in that (1) a delay explosive of which the chemical agent components comprise red lead, silicon powder, a burning rate modifier and a binder, wherein by precisely controlling the particle size and purity of the components, the chemical agent is subjected to aging treatment so that the storage performance and delay precision became stable; (2) structure of the delay element comprises a delay explosive as an inner layer, a hard metal restraint tube as a secondary layer and a metal wrap layer which has small thermal conductivity and low heat energy and is ductile as an outer layer; (3) preparation of the delay element is achieved by the following steps that the hard metal tube with desired specifications is selected, a metal hose sleeves the hard metal tube and is drawn and precisely cut into the restraint element with a desired length; and (4) explosive charging is performed, specifically the explosive is quantitatively press-charged into a delay explosive core with uniform density for many times under a constant pressure in a special device. Due to the precise control of the explosive charging and the effect of the outer wrapping layer, the delay element can be used for the assembly of industrial delay electric detonators or nonel tube detonators, and is especially suitable for the assembly of coal mine type millisecond delay electric detonators and thus the precision delay is completed.

Description

technical field [0001] The invention belongs to the technical field of detonating equipment, is a component of a drug delay detonator, and in particular relates to a high-precision safety delay element. [0002] technical background [0003] At present, most of the delay components of industrial detonators use the lead core drawing technology. The delay medicine is put into the cast lead tube, and the single-core or multi-core lead delay body is made into a single-core or multi-core lead delay after repeated rolling and die-drawing. According to the cutting length and formula Determine the extension time; due to the soft lead, when the density of the drug core exceeds a certain value, the extrusion lead wall will be deformed, causing the diameter and density of the drug core to be uneven; The core is in an irregular strip shape; the drug core becomes thinner at the printed part of the card, and the delay element becomes longer as a whole; in addition, when the density of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F42C11/06
Inventor 颜事龙韩体飞陈磊康磊杜明燃龚悦苏洪张涵刘峰
Owner ANHUI UNIV OF SCI & TECH