227 results about "Blast effects" patented technology

The invention provides a method for analyzing bench slope stability under blasting effect, and belongs to the technical field of open-pit mining. Compared with a conventional method, the method combines numerical simulation with vibration monitoring, and uses vibration information of a slop body to correct material parameters of the slop body, and provides more accurate input parameters for numerical simulation. A numerical simulation method coupling finite elements with discrete elements is used to perform mechanical analysis, and progressive failure process of the slope under blast load effect is completely depicted. A calculation result is more accurate. Rupture degree is used to evaluate slope stability, and internal damage and rupture conditions of a slope body can be directly reflected, and an evaluation index is more reasonable.

An assembly for protecting against explosions and explosive devices is formed with aerogels and frangible components. The basic configuration forms a space between an object to be protected by an aerogel having a frangible backing layer. Such assemblies may be mounted on vehicles and structures, and alternatively used as barriers without attachment to other objects. Different geometries for the rear surface of the assemblies enhance the ability of deflecting gas produced by explosions away from objects to be protected. Flowable attenuating media may be introduced into the space behind the aerogel and in gratings placed in the front of assemblies in order to increase blast energy dissipation in intense blast conditions. Armor components may be added to the rear surface to protect against fragments and projectiles. Aerogels, metal foams, and dense ceramic beads may be incorporated to enhance protection against explosively-formed penetrators and other projectiles.

The invention provides a technology for blasting an inclined thin ore body by dividing ores and rocks in area in drift driving, belonging to the field of mining engineering. A design process comprises the steps of: 1, dividing a waste rock area (9) and an ore area (10) according to an ore body and a rock distribution condition of a tunnel cross section; 2, arranging a main easer (1) and a secondary easer (2) at the lower part in the waste rock area; 3, arranging an auxiliary hole (3) in the waste rock area according to the size of the cross section; 4, arranging a breaking hole (6) in the ore area according to an inclination angle of the ore body and the size of the cross section; 5, arranging rim holes (4 and 7) and bottom holes (5 and 8) in the circumference edge and the bottom edge of a tunnel; 6, charging each blast hole; 7, sequentially initiating the blast holes; and 8, clearing slag after blasting, and respectively transporting the ores and the waste rocks. With the adoption of the technology provided by the invention, the quantity of the blast holes can be reduced, the use ratio of the blast holes can be improved, a blast effect can be enhanced, the driving efficiency and the ore and rock transportation efficiency can be improved, the dilution rate of the byproduct ores and the engineering cost can be reduced, and the economical benefits of a mine can be improved.

The invention relates to a construction method of a blasthole stemming structure for drilling blasting and a concrete block structure for the method. The blasthole stemming structure comprises a cylindrical-conical reinforcement built-in concrete block structure, a buffer section and a rock ballast filling body meeting certain grain size requirements, wherein one end of the cylindrical-conical reinforcement built-in concrete block structure is conical while the other end is cylindrical. After shock waves formed after explosion of a blasting cartridge pass the buffer section, concrete blocks on the blocking section generate velocity of movement towards the orifice direction under the action of the buffer section, the rock ballast filling body is squeezed and generates dislocation due to the wedging effect of the upper cone during movement so as to be squeezed and compacted, and bonding power and friction force among particles increase sharply. Meanwhile, the rock ballast filling body generates lateral expansion, however, the squeezed and compacted rock ballast blocks the cylindrical-conical reinforcement built-in concrete block from rushing outwards due to the constraint effect of the hole wall, so that detonation gas is effectively prevented from escaping from the blasthole, acting time of the detonation gas on rock is prolonged, explosive energy is fully utilized, and blasting effect is enhanced.

An improved building structure and method for making steel frame buildings includes a beam-to-column or beams-to-column joint or connection which is most preferably shop fabricated (as opposed to on-site fabrication) and which offers a considerable savings in both steel requirements (i.e., material savings) and labor to make the joint connection. Also, because material utilization is improved in the connection, the new structure is more resistant to damage by seismic events (i.e., earthquake), by severe weather, and to damage from blast effects (i.e., terrorist attack or accident), than was the prior technology. The improved building structure also mitigates against progressive collapse of the building.

The invention discloses a detonation control method for reducing blasting vibration effect, which uses digital electronic detonators to reduce blasting vibration effects by controlling the number of each detonator section. One is: the selection of the number of detonator segments adopts the principle of mutual interference between blasting vibration peaks and troughs to reduce vibration, specifically: the delay time between the holes of each row of blast holes adjacent to the detonator detonator ΔTi = T/2-1000*a/c, where T is the main vibration period of the blasting vibration, in milliseconds; ΔTi is the delay time between adjacent blastholes for sequential detonation, in milliseconds; a is the distance between blastholes, in meters; c is the propagation velocity of seismic waves in rocks, The unit is m/s; the inter-row delay between adjacent rows: ΔTj=nΔTi, ΔTj is the inter-row delay time, and the unit is millisecond; n is the number of adjacent front row detonator segments. The second method is: the selection of the number of each detonator section adopts the principle that the blasting vibration waves are independent of each other and vibration does not superimpose, that is, the inter-hole delay ΔTi=(1.0~1.5)t of sequentially detonating adjacent detonators.

A rapidly deployable portable convertible blast effects shield/ballistic shield includes a set two or more telescoping cylindrical rings operably connected to each other to convert between a telescopically-collapsed configuration for storage and transport, and a telescopically-extended upright configuration forming an expanded inner volume. In a first embodiment, the upright configuration provides blast effects shielding, such as against blast pressures, shrapnel, and/or fire balls. And in a second embodiment, the upright configuration provides ballistic shielding, such as against incoming weapons fire, shrapnel, etc. Each ring has a high-strength material construction, such as a composite fiber and matrix material, capable of substantially inhibiting blast effects and impinging projectiles from passing through the shield. And the set of rings are releasably securable to each other in the telescopically-extended upright configuration, such as by click locks.

The invention discloses a construction method for deep hole blasting on a high slope in a complex environment, which comprises the following steps: 1) drafting an overall blasting construction plan, 2) calculating the maximum amount of charge in a section, 3) reasonably determining blasting technical parameters, 4) Drilling, 5) charge and blockage, 6) connection to the detonation network and detonation, 7) blasting effect check and vibration test; adopt "layering in the hole, slight difference inside and outside the hole, multiple sounds in one hole, and charge the air column at intervals" "blasting method, the blasting technical parameters include blasting hole diameter, hole depth, hole spacing, row spacing, explosive unit consumption and single hole charge, the drilling equipment is a self-propelled medium and deep hole drilling rig, and the charge structure is an air column spacer medicine. The invention adopts the shock absorption measures of the air column spaced at the bottom of the hole and the uncoupled charge structure to control the blasting vibration, monitors the blasting vibration for each blasting, and optimizes the blasting parameters in time, effectively guiding the complex environment such as adjacent buildings and residential areas. Under blasting construction.

The invention discloses a fireworks and crackers blasting-agent composition. Agents in the fireworks and crackers blasting-agent composition include, by weight, 40%-60% of potassium perchlorate, 15%-30% of potassium acid phthalate, 10%-20% of a metal-filled multi-walled carbon nanotube, 5%-10% of metal oxide and 3%-5% of black powder, the multi-walled carbon nanotube is filled with one or more combinations of metals of aluminum, silver, iron, nickel, potassium, magnesium, lithium, sodium and the like, and the metal oxide is one or more combinations of ferroferric oxide, iron sesquioxide, copper oxide, manganese oxide, zinc oxide, cobalt oxide and aluminum oxide. The fireworks and crackers blasting composition agents free from metal powder are obviously improved in security coefficient, the explosion dynamics of the agents is high, burning rate of bright points is high, shelf life is long and blasting effect is good.

The invention relates to the technical field of underground mine blasting explosive loading operation, and discloses a method for loading explosive in fields in a mixed manner on the basis of underground explosive loading trucks. The method includes steps of enabling lift arms to shift automatic tube conveying machines to places near blast holes under remote control; turning and shifting the automatic tube conveying machines to align the head ends of explosive loading tubes with the blast holes; starting the automatic tube conveying machines to automatically convey the explosive loading tubes into the blast holes; starting emulsion pumps and sensitizer pumps when the explosive loading tubes are conveyed to the bottoms of the blast holes, and respectively delivering emulsion substrates and sensitizers into the blast holes via the explosive loading tubes. The automatic tube conveying machines are arranged at the front ends of the lift arms. The method for loading the explosive in the fields in the mixed manner on the basis of the underground explosive loading trucks in an embodiment of the invention has the advantages that emulsion explosive mixed loading operation in the fields is automated, accordingly, the explosive loading efficiency can be improved, the labor intensity can be relieved, the safety of operators can be guaranteed, and blast effects further can be enhanced.

The present invention relates to the technical field of sand blasting and particularly relates to automatic conveyor-type wet sand blasting equipment; the equipment comprises an engine cover, a conveying mechanism, a sand blasting mechanism, a cleaning mechanism, a feeding mechanism for feeding grinding liquid into the sand blasting mechanism, a grinding liquid collecting mechanism for collectingthe grinding liquid and a mist removing mechanism for removing water mist in the engine cover, wherein the feeding mechanism and the cleaning mechanism respectively communicate with the grinding liquid collecting mechanism. Multiple sand blasting mechanisms of the equipment can simultaneously conduct sand blasting to workpieces from multiple sand blasting directions, and thus the equipment is suitable for sand blasting of outer surfaces of various workpieces; dirt and other sundries on the outer surfaces of the workpieces are removed to reach the matte finish effect; the equipment has the advantages that the sand blasting efficiency is high, the sand blasting effect is good, the grinding liquid can be can recycled so as to reduce the loss and no floating dust presents during sand blasting,thereby greatly improving environmental pollution and hazards of worker health resulted from the dust.

The invention discloses a sand blasting device for a wind blade surface and a sand blasting method thereof. The sand blasting device comprises two symmetric sand blasting mechanisms (1), a de-dusting mechanism (2), a sand recycling mechanism (3) and blade traveling mechanisms, wherein the de-dusting mechanism (2) is arranged between the two symmetrical sand blasting mechanisms (1); the sand recycling mechanism (3) is arranged at the bottom of a middle area of the two symmetrical sand blasting mechanisms (1); the blade traveling mechanisms are arranged on the two sides of the sand recycling mechanism (3). The sand blasting device has the advantages of reasonable structure design, convenience in operation, low cost, excellent sand blasting effect, no damage to fan blades, capability of greatly increasing the processing efficiency and greatly saving manpower, less environmental pollution and wide application in sand blasting for the large-size wind blade surface. The sand blasting method for the wind blade surface provided by the invention has the advantages of reasonable technical design, high maneuverability, high working efficiency, low cost, high quality of the wind blade surface subjected to sand blasting and capability of increasing the overall performance of the wind blade.

Systems, equipment, and methods to deposit energy to modify and control shock waves and hypersonic or supersonic fluid flow, including systems for controlling, mitigating, and/or effecting air flow in relation to air vehicles, wind tunnels, or other assets, or the like, as well as systems, equipment, and methods for disrupting the shock structure at the inlet for the engine of an air vehicle traveling at supersonic or hypersonic speed; mitigating blast effects on vehicles; mitigating heating of throats in supersonic and hypersonic wind tunnels, as well as control the flow parameters and Mach number in their test sections.

A coal seam blasting pressure relief effect assessment method includes steps of arrangement of microseismic sensors, calculation of blast hole microseismic event energy, determination of judgment criteria and the like. The coal seam blasting pressure relief effect assessment method is high in operability and precision and reliable in result, and the problem of difficulty in quantitative assessmentof blasting effects is solved.

A method for predicting blasting gradation in block stone mine includes such steps as: 1, obtaining influence factors of blasting effect as input parameters, taking a distribution index of blasting gradation as an output parameter, and establishing sample database, obtaining blasting effect influence factor as input parameter, taking blasting gradation distribution index as output parameter, and setting up blasting gradation index as output parameter. 2, establishing a BP neural network; 3, optimizing a BP neural network through a genetic algorithm to form a GA-BP model; 4: through the sampledatabase of Step 1, performing GA-BP model training; 5, adopting the model obtained in the step 4 to predict the blasting grade distribution of the block stone material mining. The invention integrates the advantages of the two algorithms to recombine the blasting gradation prediction model, and establishes the GA-BP model for the blasting gradation prediction, thereby improving the Prediction Model of Blasting Grading and its Performance and Precision. The algorithm itself has the function of self-learning and self-adjusting, and has strong adaptability to the model, which can meet the engineering application requirements of gradation prediction in block stone blasting mining.

The invention relates to the technical field of mining, in particular to a method of smooth powder charge for preventing a blast hole from collapsing. According to the method of the smooth powder charge for preventing the blast hole from collapsing, the blast hole is filled with a sleeve, so as to realize the smooth powder charge; a sleeve taking rod is inserted into the sleeve, so as to resist an explosive roll, the sleeve is retracted, explosives are left in the blast hole, then a detonator is put in, the blast hole is blocked by adopting stemming, and detonation is waited; thus, the blast hole is supported in advance, so as to prevent the blast hole from collapsing. Compared with a method of unblocking the blast hole by adopting a hole unblocking device, energy consumption for secondary treatment is reduced, high dust pollution is avoided, repeated recycling of the sleeve is realized, and the blasting cost is reduced; a bamboo chip is pressed to the bottom of the blast hole, so as to prevent slag at the bottom of the blast hole from entering the sleeve, wherein the size of the slag is close to the inner diameter of the sleeve, and the appropriate arrangement and blasting effects of the explosives are further guaranteed.

The invention provides a method of loose blasting by high-pressure water jet helical cutting. The method includes the steps: 1, drilling; 2, performing high-pressure water jet helical cutting; 3, charging; 4, sealing holes; 5, blasting. The method has the advantages that a crack zone formed by the method compared to traditional loose blasting is wider, coal seam permeability is greatly improved, control holes are fewer, and the cost is reduced; through the application of the water jet helical cutting manner, the defects of traditional mechanical cutting, such as tool jamming and drill locking, are overcome; the size of jet seams is determined by jet parameters, so that the problem that the size of the seams affects blasting effect is solved; helical cutting can be performed in axial and radial directions alternatively, through the application of the helical cutting manner, the range of crack zone is greatly enlarged and compensating space is provided for blasting, cut density can be adjusted, blasting lumpiness is controlled, and energy availability is improved; accordingly, economic benefit is increased on the premise of effectively preventing coal and gas outburst.