CN104501666A - High-precision safe-type delay element - Google Patents
High-precision safe-type delay element Download PDFInfo
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- CN104501666A CN104501666A CN201410710172.8A CN201410710172A CN104501666A CN 104501666 A CN104501666 A CN 104501666A CN 201410710172 A CN201410710172 A CN 201410710172A CN 104501666 A CN104501666 A CN 104501666A
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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
The invention belongs to initiating equipment technical field, is parts of medicament delay detonator, is specifically related to a kind of high accuracy safety-type delay element.
Technical background
Current industrial detonator delay element many employings lead for retractable pencil drawing technique, loads in the lead pipe of casting by delay powder, make single core or the plumbous delay element of multicore through repeatedly roll extrusion and cover die drawing, determines defer time according to cutting long and formula; Because plumbous matter is soft, after medicine core density exceedes certain value, extrude the distortion of plumbous wall, make medicine core diameter and density unevenness; For multicore delay element, in drawing process, the effect of power is different, makes medicine core become irregular bar shaped; In card, print place medicine core attenuates, and delay element entirety is elongated; In addition, when medicine core density is less, or when defering medicine prescription changes, there will be to fall medicine phenomenon at delay element two ends; Such as above-mentioned technique all can affect delay powder combustion accuracy, and simultaneously plumbous a large amount of uses are unfavorable for environmental protection.
Electric detonator accuracy delay time is high, and its invention has promoted the development of short-delay blasting, but electric detonator is produced and human users's technical requirement is high, expensive, can not popularize, and underground coal mine strictly prohibits the use electric detonator in blasting engineering.
Chinese patent, patent No. CN2628986Y, disclosed delay body for industrial detonator, its delay powder constraint material is plumbous or lead-antimony alloy, skin plastic sheath; Tubular type delay element loads in Can, adds and is pressed into; This utility model prints without in card, eliminates in card the impact printed delay precision, but effectively can not control the degree of packing of delay powder and solve the conforming problem of degree of packing.
Chinese patent, patent No. CN201637356U, disclosed precise detonator, its delay element is retracted in cage walls by compressing delay grain to make, and the free-running property of different formulations delay powder, make compressing and be retracted into cage walls difficulty, technical requirement is high, and cage walls material can participate in reaction in delay powder combustion process in addition, produces a large amount of gas, the local pressure environment of delay powder burning certainly will be changed, thus affect delay precision.
Chinese patent, patent No. CN102173971A, disclosed micro-plumbous delay detonating detonator preparation method, its delay element passes through drawing technique, lead and aluminium-alloy pipe that delay powder is housed are drawn into the thin metal pipe of required diameter, then make delay element after plastic-coated being carried out to metal tube, be cut into delay element and be assembled into delay detonator, avoid in this invention using plumbous extension constraint material contaminated environment in a large number; The outer plastic-coated of metal tube reduces the heat leakage in the use of metal material and delay powder combustion process, the stable state combustion of favourable delay powder, but drawing process can not control the degree of packing of delay powder by accurate quantification, in drawing process, metal tube first fills delay agent, there is potential safety hazard, choosing of metal aluminum pipe limits the application of this delay element on allowed for use in coal mines millisecond electric detonator.
Summary of the invention
Patent object of the present invention is: be difficult to accurate control for the Powder pressing density of existing delay element, medicine core shape, affect delay precision, and in conjunction with the requirement of allowed for use in coal mines millisecond delay electric detonator delay element security, invent a kind of high accuracy safety-type delay element.
Patent high accuracy safety-type delay element of the present invention comprises: the structure of delay element, the preparation of extension confinement element, the powder charge of delay powder.
Described in patent high accuracy safety-type delay element of the present invention, delay element is made up of three parts, outer layer covers layer, and its material is the metal that thermal conductivity factor is little, matter is soft, low calorie, ductility are good, as plumbous, lead-antimony alloy.Integument external diameter is 6.2 ± 0.1mm, wall thickness is within the scope of 1.6 ~ 2.2mm, sublevel restraint layer is the hard metal circular tube of low calorie, wall thickness is within the scope of 0.5 ~ 1.0mm, as copper pipe, stainless steel tube, kirsite pipe etc., metal tube can ensure that tube wall is indeformable in encapsulation process and pressing process, make medicament shape and degree of packing consistent, centre is medicine core medicament, different series, different formulations delay agent are selected in requirement according to defer time, after press-fiting, medicine core is regular cylindrical, and its medicine core diameter is within the scope of 1.0 ~ 2.0mm.
In the preparation process of the extension confinement element described in patent high accuracy safety-type delay element of the present invention, according to different series, different formulations delay powder, choose material and the caliber of the hard metal restriction pipe of sublevel, selection principle: low heat release delay powder constraint caliber can select major diameter to retrain pipe, the constraint caliber of high heat release delay powder medicine core can suitably reduce, coated metal pipe on hard metal circular tube overlaps outward, the hard metal restriction layer of tight wrapping inner layer after cold-drawn, adopts accurate cutting hollow delay element to be cut into the extension confinement element of Len req.
The powder charge of the single delay element described in patent high accuracy safety-type delay element of the present invention carries out in special means for loading, this device comprises fixing kerve, back taper funnel, push rod, constant-pressure pressing machine, batcher, its powder charge process is: will be placed in fixing kerve bottom extension confinement element, top puts special back taper funnel, according to the density needed for different series, the smooth combustion of different formulations delay powder, calculate single dose and drug-pressuring pressure, choose batcher, drug-pressuring pressure is set; Adopt constant pressure arrangement act on thimble pressing, thimble diameter is consistent with hard metal internal diameter, carry out repeatedly, quantitatively, level pressure powder charge, flush to powder column height with extension confinement element height.
The beneficial effect of high accuracy safety-type delay element of the present invention is: sublevel hard metal restriction layer can ensure delay powder press-fit into high density after powder column indeformable, keep regular columnar structure; Adopt repeatedly, quantitatively, level pressure powder charge can guarantee grain density uniformity, improve medicament combustion stability, improve delay precision; Outer layer covers metal adopts little, the easy extension of thermal conductivity factor, low calorie, easily drawing forming, and closely wraps up the hard metal of sublevel, and low heat value material is applicable to underground coal mine, meets the requirement of underground coal mine different safety class according to the large I of medicine core diameter.
Accompanying drawing explanation
Fig. 1 is that the present invention delays confinement element structure chart.
Fig. 2 is delay element structure chart of the present invention.
Fig. 3 is powder charge figure of the present invention.
Wherein: 1 outer layer covers layer, the hard metal restriction layer of 2 sublevel, 3 delay grains, 4 firm bankings, 5 back taper funnels, 6 pressing push rods, 7 extension confinement elements, 8 delay elements, 9 means for loadings.
Detailed description of the invention
Embodiment 1. degree of packing uniformity controlling.
Choosing material is stainless steel metal pipe, external diameter is 3mm, wall thickness 0.5mm is as hard metal restriction layer, outer layer covers layer chooses material for plumbous, lead pipe is enclosed within stainless pipe, through being drawn into the extension obligatory point that external diameter is 6.3 ± 0.1mm, cut into 15mm length, extension confinement element, extension confinement element is placed in firm banking, put special back taper funnel, choose the pressing push rod that diameter is 2mm, medicament is red lead-silicon-three sections, selenium system defering medicine prescription, pressing pressure is 300Mpa, according to push rod Cross section calculation drug pressing machine setting pressure F value, weighing extension confinement element quality is m
1, dosing, pressing are equal with extension confinement element height to powder column height, weigh the quality m of delay element
2, by formula ρ=(m
2-m
1)/(π D
2/ 4) × H, wherein H is powder column height, and D is powder column diameter, thus calculates grain density, and table 1 is 10 degree of packing statistics.
Table 1
Embodiment 2. delay element defer time is tested.
Utilize the above-mentioned delay element defer time of photoelectricity test technical testing, delay element is loaded in the metal tube of both ends open, utilize special seal device fixed sample and photoelectric sensor, by oscilloscope display test waveform, the defer time often sending out delay element is read from waveform, statistical analysis, obtains data shown in table 2.
Table 2
Above-mentioned two case study on implementation results show: through repeatedly, quantitatively, the delay element that press-fits of level pressure, grain density uniformity is good, and density relative deviation is 1.67%; Defer time test result shows, accuracy delay time is higher, and extreme difference is 3.210ms, and relative extreme difference is 1.568%.
Case study on implementation 3. delay element wall surface temperature is tested.
Choosing material is stainless steel metal tubule, external diameter is 2mm, wall thickness 0.5mm is as hard metal restriction layer, outer layer covers layer chooses material for plumbous, lead pipe is enclosed within stainless pipe, through being drawn into the extension obligatory point that external diameter is 6.3 ± 0.1mm, cut into 15mm length, extension confinement element, extension confinement element is placed in firm banking, put special back taper funnel, choosing diameter is 1mm pressing push rod, medicament is red lead-silicon-three sections, selenium system defering medicine prescription, pressing pressure is 300Mpa, according to push rod Cross section calculation drug pressing machine setting pressure F value, dosing, pressing is equal with extension confinement element height to powder column height.
Choose factory's finished product 3 sections of permitted electric detonator for coal mine delay elements, utilize infrared radiation thermometer to test wall surface temperature when delay element burns.
Table 3
Experimental result shows, in the high accuracy safety-type delay element medicine core combustion process of invention, the heat of generation to wall, makes wall surface temperature raise through confinement element heat transfer, and temperature value and existing 3 sections of permitted electric detonator for coal mine delay element wall surface temperatures are more or less the same.
Proved by above experiment case study: high accuracy safety-type delay element, medicine core even density is easy to control, and delay precision is high; In combustion process, delay element wall surface temperature is low, extension confinement element material low calorie, is applicable to underground coal mine and uses.
Claims (6)
1. high accuracy safety-type delay element, is characterized in that, comprising: the structure of delay element, and delay element is made up of outer layer covers metal level, the hard metal restriction layer of sublevel and internal layer delay powder core; The preparation of delay element, chooses the hard metal circular tube of required specification, puts outer layer covers metal hose, the hard metal restriction layer of tight wrapping inner layer after drawing, adopts accurate cutting, hollow delay element is cut into the extension confinement element of Len req; Powder charge, does not require to select corresponding delay agent according to section, in special device, adopts repeatedly, quantitatively, level pressure press-fits delay powder, makes medicine core be pressed into the column structure of even density.
2. high accuracy safety-type delay element as claimed in claim 1, its preparation method is: by the mode of cold drawing, the metal tube of unlike material is added and form, and then carries out cutting rear level pressure quantitative loading.
3. high accuracy safety-type delay element as claimed in claim 1, its architectural feature is: outer layer covers layer material is the metal that thermal conductivity factor is little, matter is soft, low calorie, ductility are good, as plumbous, lead-antimony alloy.Integument external diameter is 6.2 ± 0.1mm, within the scope of wall thickness 1.6 ~ 2.2mm.Sublevel restraint layer is hard metal circular tube, wall thickness within the scope of 0.5 ~ 1.0mm, as copper pipe, stainless steel tube, kirsite pipe etc.Can require to select different series, different formulations delay agent as internal layer delay agent according to defer time, medicine core is regular cylindrical, and medicine core diameter is within the scope of 1.0 ~ 2.0mm.
4. high accuracy safety-type delay element as claimed in claim 1, the preparation of its extension confinement element is: overlap coated metal pipe outward at the hard metal circular tube of sublevel, through cold-drawn, the hard metal restriction layer of tight wrapping inner layer, adopts accurate cutting hollow delay element to be cut into the extension confinement element of Len req.
5. high accuracy safety-type delay element as claimed in claim 1, its powder charge process is: be placed in holddown groove by bottom extension confinement element, top puts special back taper funnel, according to the density needed for different series, the smooth combustion of different formulations delay powder, calculate single dose and drug-pressuring pressure, carry out repeatedly, quantitatively, level pressure powder charge, flush to powder column height with extension confinement element height.Described pressing mode adopts constant pressure arrangement to act on pressing push rod, and thimble diameter is consistent with hard metal internal diameter.
6. high accuracy safety-type delay element as claimed in claim 1, powder charge can adopt multiple means for loading to carry out synchronously, continuous, automited powder charge.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410710172.8A CN104501666B (en) | 2014-11-27 | 2014-11-27 | High-precision safe-type delay element |
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| CN201410710172.8A CN104501666B (en) | 2014-11-27 | 2014-11-27 | High-precision safe-type delay element |
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| CN104501666A true CN104501666A (en) | 2015-04-08 |
| CN104501666B CN104501666B (en) | 2017-01-18 |
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| CN201410710172.8A Expired - Fee Related CN104501666B (en) | 2014-11-27 | 2014-11-27 | High-precision safe-type delay element |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107238333A (en) * | 2017-05-26 | 2017-10-10 | 王勇兵 | The detonator delay element and preparation method of plastic tube are plastically deformed based on cold extrusion |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1346978A (en) * | 1971-12-01 | 1974-02-13 | Canadian Ind | Delay elements in blasting caps |
| CN1042007A (en) * | 1988-10-15 | 1990-05-09 | 冶金工业部马鞍山矿山研究院 | Produce the technology and the mould of delay element |
| US5173569A (en) * | 1991-07-09 | 1992-12-22 | The Ensign-Bickford Company | Digital delay detonator |
| CN2628986Y (en) * | 2003-06-07 | 2004-07-28 | 湖南省湘南爆破器材有限责任公司 | Delay body for industrial detonator |
| CN202614099U (en) * | 2012-03-22 | 2012-12-19 | 江西新余国泰特种化工有限责任公司 | Novel environment-friendly delay element |
-
2014
- 2014-11-27 CN CN201410710172.8A patent/CN104501666B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1346978A (en) * | 1971-12-01 | 1974-02-13 | Canadian Ind | Delay elements in blasting caps |
| CN1042007A (en) * | 1988-10-15 | 1990-05-09 | 冶金工业部马鞍山矿山研究院 | Produce the technology and the mould of delay element |
| US5173569A (en) * | 1991-07-09 | 1992-12-22 | The Ensign-Bickford Company | Digital delay detonator |
| CN2628986Y (en) * | 2003-06-07 | 2004-07-28 | 湖南省湘南爆破器材有限责任公司 | Delay body for industrial detonator |
| CN202614099U (en) * | 2012-03-22 | 2012-12-19 | 江西新余国泰特种化工有限责任公司 | Novel environment-friendly delay element |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107238333A (en) * | 2017-05-26 | 2017-10-10 | 王勇兵 | The detonator delay element and preparation method of plastic tube are plastically deformed based on cold extrusion |
| CN107238333B (en) * | 2017-05-26 | 2019-05-31 | 王勇兵 | Detonator extension element and preparation method based on cold extrusion plastic deformation plastic tube |
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| Publication number | Publication date |
|---|---|
| CN104501666B (en) | 2017-01-18 |
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Granted publication date: 20170118 Termination date: 20181127 |