51 results about "Brisance" patented technology

The velocity of detonation of an explosive such as detonating cord (18, 22) is controlled by the addition of a diluent to the explosive, e.g., to the core of the detonating cord (18, 22). An explosively inert diluent, or a diluent comprised of an explosive of lower brisance than the principal explosive comprising the core of the detonating cord, will serve to reduce the velocity of detonation. Such reduced velocity of detonation has beneficial effects in certain operations, including cleaving rock (10), wherein it is observed to significantly reduce radial cracks (24) and stickers (26) (long radial cracks) in the vicinity of the boreholes (12) in which the low-velocity detonating cord (18, 22) is functioned to cleave the rock (10). The low-velocity detonating cord also facilitates leaving behind a smoother face in cutting trenches and tunnels through rock. The method of manufacture of low-velocity detonating cord includes incorporating a suitable diluent, such as phenolic microballoons, into an explosive core of, e.g., PETN.

The invention relates to a powdery emulsion explosive with low detonation velocity. A rock powdery emulsion explosive, talcum powder and coarse bran are placed into a mixer for fullly stirring to ensure that the mixture is mixed evenly and then is packaged and sold, wherein the bulk density of the rock powdery emulsion explosive is between 0.58 and 0.62/g.cm<-3>, the detonation velocity is between 3,500 and 3,700/m.s<-1>, the brisance is between 15 and 17/mm, the sympathetic detonation is between 9 and 11/cm, the capacity for work is 360/ml, and the storage period is 6 months; the bulk density of the talcum powder is between 0.95 and 1.0/g.cm<-3>, and the grain diameter is 300 meshes; and the bulk density of the coarse bran is between 0.28 and 0.35/g.cm<-3>, and the grain diameter is between 0.8 and 1mmr. In the invention, the powdery emulsion explosive with low detonation velocity is applied to double metal explosive welding first, which ensures the quality of explosive welding of double metal explosive composite welding and ensures that the double metal explosive welding fully meets the requirement. The powdery emulsion explosive is safe, also has no pollution after the explosion, and has no harm to the health of blasters. The storage period of the powdery emulsion explosive with low detonation velocity can reach more than 180 days, so the powdery emulsion explosive can be mixed by manufacturers without field mixed-making and the labor intensity of the blasters is reduced.

The invention discloses a modified ammonium nitrate-fuel oil explosive for explosive welding and a preparation method of the modified ammonium nitrate-fuel oil explosive. According to the modified ammonium nitrate-fuel oil explosive, the density of the explosive is decreased by using expanded perlite, and the explosive performance of the explosive is reduced by using refined salt. The preparation method comprises the following steps of: weighing ammonium nitrate and a composite modifier according to proportions of raw materials, mixing, crushing, and drying at 80-95 DEG C; adding a composite oil phase into the dried materials, and mixing uniformly at 80-95 DEG C; and conveying wood powder, the refined salt and the expanded perlite into a cold mixer in turn, and mixing uniformly. The explosive performances, such as the density, the brisance and the explosion speed, are improved by adjusting the proportions of the raw materials of the modified ammonium nitrate-fuel oil explosive and adjusting the production process, so that the explosive can be ensured to meet explosive welding requirements of different metal materials.

A very high brisance metal powder explosive is created by including a multitude of hollow aluminum/aluminum oxide micro-particle shells deposited within a high explosive composition matrix. The interior of such micro-particle shells may contain air, nitrogen, other gases, combinations thereof, or possibly even be a vacuum. The invention might be used on warheads that are fragmentation warheads, explosively formed penetrators, air blast warheads, shaped charge jets of shaped charge warheads, or other high explosive-driven devices.

The invention discloses a powdery emulsion explosive for on-site mixed loading. The powdery emulsion explosive comprises powdery latex substrate and a sensitizer. The mass ratio of the powdery latex substrate to the sensitizer is 30: (1-1.5). The powdery latex substrate comprises sodium nitrate, crystal modifiers, flame inhibitors, water, compound additives, oil-phase materials, compound emulsifiers and emulsification assistants. The sensitizer comprises expanded perlite, carboxymethyl cellulose, polyvinyl alcohol, ammonium bicarbonate, phosphoric acid, water, urea and ammonium nitrate. The invention further discloses a preparation method of the powdery emulsion explosive for on-site mixed loading. The emulsion explosive has high detonation velocity, brisance and coupling degree and few fumes; cost is low, the state of the explosive is hard, and work capacity is high; less poisonous gas is generated during preparation, safety of operators can be improved, and environment protection can be realized; the preparation process is simple and easy to operate.

The invention relates to a method for inspecting an explosive for explosive welding. Whether the explosive is qualified is judged by measuring the bulk density, moisture, detonation velocity and brisance of the explosive and comparing measured data of the bulk density, moisture, detonation velocity and brisance of the explosive with corresponding standard values. By the method for inspecting the explosive for the explosive welding, the explosive consumption for tests and the waste of metal plates can be reduced; and the method achieves the effects of energy conservation and environment friendliness, is easy to operate, and has a practical effect.

The invention discloses a powdery expanded ammonium nitrate explosive and a preparation method for the same. The explosive is prepared by mixing the following constituents in percentage by mass: 80-88% of ammonium nitrate, 5-20% of urea, 0-7% of wood flour, and 0-2% of anti-caking and anti-water agent. In the method, urea is used as a combustible agent for replacing an oil-phase material, so that the cost of the explosive is reduced, and the production process is clean and safe; and the oxidant ammonium nitrate is mixed with the combustible agent urea, and the anti-caking and anti-water agent in a liquid-state molecular state, so that the obtained explosive is excellent in explosion performance, wherein the explosion speed is 3500-4000 m/s (32 mm cartridge), the brisance is 14-18 mm, and the gap distance is 5-10 cm.

The invention discloses a preparation method of a hollow polymer microsphere sensitized emulsion explosive for explosive welding, the emulsion explosive for explosive welding is composed of an emulsion matrix and hollow polymer microspheres, the mass fraction of the emulsion matrix is 60%-80%; the mass fraction of the hollow polymer microspheres is 20%-40%; the emulsion matrix consists of ammonium nitrate, sodium nitrate, water, an emulsifier and a compound oil phase; the hollow polymer microspheres are formed by combining one or more of polymethyl methacrylate, polystyrene, polysiloxane and polyamide microspheres. In addition, the invention provides a preparation method of the emulsion explosive for explosive welding sensitized by the hollow polymer microspheres, the hollow polymer microspheres integrate the functions of a diluent and a sensitizer, and the raw materials of the emulsion explosive are low in cost and free of pollution to the environment. Meanwhile, enterprises can adjust the proportion and content of the hollow polymer microspheres according to the requirements of different composite materials, so that emulsion explosives for explosive welding with different detonation velocities and brisance are prepared.

The invention provides a low-detonation-velocity explosive with adjustable detonation velocity and brisance and a preparation process thereof. According to the technical scheme, the low-detonation-velocity explosive is prepared by mixing the following components in percentage by mass: 52%-73% of ammonium nitrate, 2.0%-3.0% of a complex oil phase, 3%-16% of wood powder, 20%-30% of industrial salt and 0.3%-0.42% of a modifier. By the low-detonation-velocity explosive with adjustable detonation velocity and brisance, such problems of the existing explosive for explosive welding as high sensitivity, uneven explosive mixing, poor safety, poor fluidity, instable detonation velocity and the like are solved.

The invention discloses an emulsified explosive with long-term storage stability, belongs to the technical field of explosives, and relates to an emulsified explosive. The problem that an existing emulsified explosive is short in storage period is solved. The emulsified explosive with the long-term storage stability is prepared from, by weight, 72.23 parts of ammonium nitrate, 9.85 parts of sodiumnitrate, 11.71 parts of water, 1.46 parts of paraffin, 1.46 parts of microcrystalline wax, 0.31-0.96 part of base oil, 0.62-1 part of Span-80 and 0.93-2.36 parts of LZ2820. Accordingly, two emulsifiers of Span-80 and LZ2820 are mixed to prepare the emulsion explosive, and the emulsion explosive is high in detonation speed and brisance, better in storage stability and good in water resistance.

The invention relates to a low-detonation-velocity explosive for explosive welding and a preparation technique thereof. The low-detonation-velocity explosive for explosive welding is mainly prepared from 60-83 wt% of third-grade coal mine allowable powder emulsion explosive, 10-25 wt% of talcum powder, 5-10 wt% of silicon aluminum powder and 3-5 wt% of wheat straw powder. The preparation technique comprises the following steps: respectively weighing the following raw materials in percentage by mass: third-grade coal mine allowable powder emulsion explosive, talcum powder, silicon aluminum powder and wheat straw powder; and drying the talcum powder, silicon aluminum powder and wheat straw powder at 80-95 DEG C until the water content is not higher than 0.5 wt%, uniformly mixing, adding the wheat straw powder to obtain the low-detonation-velocity explosive for explosive welding, and packaging for later use. The low-detonation-velocity explosive for explosive welding is easy to produce, and has the advantage of stable performance. The low-detonation-velocity explosive for explosive welding satisfies the requirement that the explosive welding explosive brisance is 9-11mm, the detonation velocity is 2500-2750 m/s, thereby ensuring the explosive welding effect.

The invention relates to an emulsion explosive and a preparation method thereof. The emulsion explosive is prepared from the following raw materials and auxiliary materials in percentage by weight: 70 to 85 percent of ammonium nitrate, 2 to 10 percent of sodium nitrate, 5 to 15 percent of water, 1 to 5 percent of composite wax, 0.5 to 5 percent of composite emulsifier, 0.5 to 3 percent of Vaseline and 0.1 to 2 percent of mechanical oil. The emulsion explosive is low in cost, proper in state and performance, accurately metered, convenient to use, simple in process, easy to operate, safe and reliable, and has high explosion performance, high brisance and strong power.

The invention relates to an explosive, in particular to a main charge for charging of an emulsified seismic explosive column used in the field of seismic exploration. According to the technical scheme, the main charge for charging of the emulsified seismic explosive column is prepared from, by weight, 74 parts of ammonium nitrate, 9.5 parts of sodium nitrate, 9.5 parts of water, 7 parts of a composite oil phase and 2.3 parts of perlite, wherein the perlite accounts for 2.3% by weight of a matrix. The main charge adopts a pure physical sensitizing technology, and therefore the problem that the changing and unstable density of the main charge cannot be controlled due to the fact that the seismic explosive column charged through chemical sensitizing is subjected to environmental changes is solved; meanwhile, the adjustment of charge component proportion follows the zero-oxygen principle of explosive design, and the best combination of performance indexes required for exploration is also achieved, and the detonation velocity is up to 5300-5500 m/s. The main charge is simple in formula, large in brisance, stable in storage, long in storage time, harmless to human bodies and environment and low in cost.

The invention discloses an environmental-friendly powder emulsion explosive and a preparation method of the environmental-friendly powder emulsion explosive. The environmental-friendly powder emulsion explosive is prepared from the following raw materials in percentage by mass: 90 to 92 percent of ammonium nitrate, 3 to 5 percent of complex wax, 0.1 to 0.5 percent of rosin, 1 to 2 percent of emulsifying agent and 3 to 5 percent of water. A preparation process comprises the following steps of water phase preparation, oil phase preparation, emulsification and spray pulverization. The environmental-friendly powder emulsion explosive and the preparation method of the environmental-friendly powder emulsion explosive, disclosed by the invention, have the beneficial effects that an ingredient formula is more scientific and reasonable, the production technology is simple, new technological equipment does not need to be added, large-scale industrial production can be realized, and the preparation method can be widely promoted and applied to all powder emulsion explosive production enterprises; the gap distance and the brisance of a prepared product are obviously increased; the content and the proportion of the ammonium nitrate are increased, porous ammonium nitrate is cancelled, oxygen balance is achieved during explosion of the product, and the content of poisonous gas can be reduced to 29L/kg.

The invention discloses a novel low-detonation-velocity explosive applicable to stainless steel composite and a preparation method thereof; the preparation method comprises the steps: taking 60 parts by weight of a rock powdery emulsion explosive with the bulk density of 0.58 g*cm<-3>-0.62 g*cm<-3>, the detonation velocity of 3500 m/s-3700 m/s, the brisance of 15 mm-17 mm, the sympathatic detonation distance of 9 cm-11cm and the capacity for work of 360/ml, taking 36 parts by weight of sand with the bulk density of 1.40/g*cm<-3> and the particle size of 300 mesh, putting the two raw materials into a drug mixing machine, stirring for 3-5 minutes, then taking 17 parts by weight of chaff with the bulk density of 0.50/g*cm<-3> and the particle size of 300 mesh, putting the chaff into the drug mixing machine, stirring for 20 minutes, fully stirring evenly, and then detecting the density and the detonation velocity of the product. The sand is used for reducing the detonation velocity, and the chaff is used as a density regulator for regulating the density of the mixed explosive; the effective density of the rock powdery emulsion explosive is reduced by the combined action of the sand and the chaff; the novel low-detonation-velocity explosive obtained by mixed loading of the raw materials in proportion can increase the production efficiency and solves problems of unfit large-area stainless steel-steel composite plates.

The invention relates to a preparation method of a high detonation velocity and low density explosive for copper-steel compounding. The preparation method comprises detecting whether the pure density, brisance and detonation velocity of an emulsion explosive satisfy factory explosion parameters, adding the emulsion explosive and perlite into a mixing machine together according to a weight ratio of 50: 45 when the emulsion explosive has the eligible explosion parameters, carrying out uniform stirring, adding bran into the mixing machine, fully stirring the mixture, wherein a weight ratio of the emulsion explosive, perlite to bran is 50: 30: 45, and detecting product density, brisance and detonation velocity in the mixing machine, wherein the product with the density of 0.78-0.81g/cm<3>, the intensity of 12-14mm and detonation velocity of 2400-2500m/s is an eligible product. The copper-steel composite plate obtained by preparation of the explosive has minimum shear strength tau b of greater than or equal to 140Mpa, and has a bonding rate of 100% in the area except a detonator shadow region.

The invention relates to an emulsion explosive quality prediction and optimization method. The method comprises the following steps: acquiring historical data of an emulsion explosive, preprocessing the historical data, performing correlation analysis on process parameters of an emulsion explosive production process and the quality of the emulsion explosive, and selecting the process parameters; establishing a random forest emulsion explosive quality prediction model, and designing a queue competition algorithm to optimize random forest model parameters; on the basis of the established random forest emulsion explosive quality prediction model, taking maximizing the emulsion explosive quality index brisance and detonation velocity as optimization objectives, taking the technological parameter operation range as a constraint condition, establishing an emulsion explosive quality double-objective optimization model, designing a multi-objective queue competition algorithm for solving, and solving to obtain the optimal process operation parameters under the condition of maximizing the brisance and the detonation velocity.

The invention discloses an explosive bolt box and a preparation method thereof and relates to a bolt box and a preparation method thereof. The explosive bolt box solves the problem that an existing explosive bolt is poor in load bearing capacity, not high in strength, easy to cause pollution by brisance and hard to control. Two explosive bolt box side plates are mounted on two sides of an explosive bolt box back plate; a top plate is arranged on the explosive bolt box back plate and the two explosive bolt box side plates, a weight-reducing hole is formed in the center of the back plate, and a plurality of screws or rivet through holes are formed. The preparation method comprises the following steps of: paving a prepreg on the surface of a valve; putting the valve in a positioning groove; paving residual skin; combining dies; heating; curing; cooling; demoulding; and machining. The explosive bolt box disclosed by the invention is applied to the aerospace field.

The invention relates to the field of explosives, in particular to a specific HMX, and solves the technical problems that a conventional HMX product has wide grain fineness distribution, unsmooth crystal plane and lower desensitization performance, and is not suitable for grain size distribution and the like. The specific HMX is prepared by the following steps: (a), HMX is dissolved by dimethyl sulfoxide at the temperature ranging from 40 DEG C to 85 DEG C to prepare an HMX solution; (b), three types of dimethyl sulfoxide aqueous solutions with different concentrations are sequentially added at the constant speed to dilute and crystalize the HMX solution; sufficient water is added at the constant speed after the dimethyl sulfoxide aqueous solutions are added; the sufficient water means that water is added until no new HMX is crystalized out; and (c), the crystalized solution is filtered and washed to obtain the specific HMX. The produced HMX is large in grain size of the product and narrow in distribution, and has smooth crystal plane and no obvious corner angle, an axial ratio is smaller than 1.5, and performance of charge density, brisance and the like are effectively improved.