313 results about "TEX-explosive" patented technology

The invention discloses a double-row medium-length hole blasting method for a filling stope. According to the method, a theoretical value range of each blasting parameter is deduced according to field engineering practice, an ore rock blasting crushing mechanism and a blasting parameter theoretical formula. The method comprises the following steps of: constructing a stope blasting model with different hole bottom distances, explosive unit consumption and resistance line combinations by using ANSYS numerical simulation software in combination with physical and mechanical properties of ore rocks and field explosive performance parameters, and preferably selecting double-row medium-length hole blasting parameters according to a chamber effective stress distribution rule and a roof area vibration velocity peak value of the ANSYS blasting model. According to the method, by selecting the double-row optimal medium-length hole blasting parameters, it is guaranteed that ore rocks in the chamber are fully crushed, the effective stress invading the roof and the blasting vibration velocity peak value are reduced, and the roof is prevented from being damaged. And meanwhile, the explosive loading amount is reduced, the economic cost is reduced, and the production efficiency of a mine is improved.

The invention discloses a drilling, deslagging, charging and blocking integrated device, which belongs to the technical field of tunnel engineering and open-air engineering blasting equipment, and comprises a mobile vehicle body, a multi-link structure, a drilling and deslagging device, an explosive filling device and a stemming blocking device. The drilling and deslagging device is used for drilling and discharging drilling cuttings; and the explosive filling device independent track is arranged above the drilling machine beam track in parallel and is used for accurately conveying detonators and emulsion explosives into holes. After drilling is completed, the explosive filling device moves downwards in parallel to be aligned with the hole site for charging; after charging, the device moves upwards to drive the stemming plugging device to reach an orifice, and drilling cuttings discharged by drilling are directly used as stemming raw materials for automatic compaction and plugging. The problems that in the traditional blasting construction process, equipment is frequently switched, the manual operation efficiency is low, high-risk link manual operation needs to be conducted, and stemming raw materials need to be prepared independently are solved, automatic continuous operation of the whole process of drilling, charging and plugging is achieved, and the construction efficiency and intrinsic safety are remarkably improved.

The invention relates to the technical field of blasting construction, and particularly discloses a tunnel back break intelligent control method which comprises the following steps: S1, scanning a tunnel face to be blasted to generate high-precision point cloud data; s2, constructing a tunnel face BIM model according to the high-precision point cloud data, and performing space coordinate registration; judging whether blasting is carried out for the first time or not, and if blasting is not carried out for the first time, displaying a blast hole of last blasting on the tunnel face BIM model; s3, receiving input of blast hole space coordinate data of the blasting, and creating blast holes of the blasting on the tunnel face BIM model according to blast hole space coordinates; s4, installing an intelligent laser projector in the tunnel; s5, a reference control point is arranged on the arch crown of the tunnel, projection parameters are calculated, and blast holes of the blasting on the tunnel face BIM model are projected to the actual tunnel face; and S6, drilling is conducted according to the projection, explosives are installed, and blasting is conducted. By the adoption of the technical scheme, the blast hole layout change can be accurately positioned, and the blasting precision is improved.

The invention discloses a rock blasting load transfer and throwing simulation method which comprises the following steps: S1, acquiring field parameters of a target blasting project, the field parameters comprising rock mass mechanical parameters, explosive parameters, blast hole parameters and charging structure parameters; and S2, based on the field parameters, constructing a three-dimensional explosive-rock calculation model by adopting pretreatment software, dividing grids, importing the grids into finite element software, setting a material model, a state equation and boundary conditions, and simulating an explosive detonation process. The limitation of a single numerical value method is solved; quantitative analysis and accurate prediction of rock blasting lumpiness are achieved, inclined joints are adopted in the discretization process, actual rock mass joint distribution is better fitted, and the reliability of a simulation result is improved; bulk rocks and excessive crushing phenomena are effectively reduced, the explosion energy utilization rate is improved, the engineering cost is reduced, and a scientific basis is provided for explosion design of projects such as mining and water conservancy and hydropower.

The invention discloses an asymmetric and uncoupled tunnel smooth blasting method. The method comprises the steps that surrounding rock grading data and initial ground stress distribution of a target area are obtained, and a low-damage trial blasting scheme is optimized; drilling operation is conducted on the basis of the low-damage trial explosion scheme, a specific pre-charging place is selected to assemble an asymmetric non-coupling refined charging sleeve device, and a peripheral hole pre-charging sleeve device is further assembled; the peripheral holes are filled through a peripheral hole pre-charging sleeve device, other blast holes are filled in a continuous charging mode, and blocking is conducted after filling is completed; and constructing a detonating network, ventilating after detonating, checking the detonating effect, and iteratively optimizing a trial detonating scheme according to a damage judgment result. According to the method, the acting direction and the acting range of energy during blasting of explosives in peripheral holes can be accurately controlled, so that the disturbance influence of the blasting effect on surrounding rocks is relieved, the blasting damage degree of the surrounding rocks is reduced, construction safety is guaranteed, the occurrence frequency of back break phenomena is reduced, and the construction efficiency can be greatly improved.

The invention relates to the technical field of engineering blasting, and discloses a blast hole wall impact pressure indirect measurement device, which comprises an external fixed steel pipe, a blast hole wall is arranged in the external fixed steel pipe, a blocking material is arranged at the opening end of the external fixed steel pipe, and the external fixed steel pipe is used for transmitting and attenuating the explosion pressure borne by the blast hole wall; the energy source is arranged in an inner cavity of the external fixed steel pipe, and the energy source is an explosive cartridge or a liquefied air energy storage pipe; the detonating equipment comprises an electronic detonator and an electric lead, the electronic detonator is pre-buried in the explosive cartridge or the liquefied air energy storage tube, and the electronic detonator is connected with an external exploder through the electric lead; the strain gauges are fixedly connected to the outer wall of the external fixing steel pipe, and a pressure testing system is arranged outside the external fixing steel pipe. According to the invention, the strain gauges are fixed on the outer wall of the external fixed steel pipe, and the steel pipe is used as a medium for pressure transmission and attenuation, so that the impact pressure generated by explosion is greatly reduced.

The invention provides a BIM-based open bench blasting blast hole fine charging design optimization method, and relates to the technical field of electric digital data processing, and the method comprises the following steps: collecting related characteristic parameters of a blasting project; establishing a blasting wave and range mathematical model, and outputting a blasting wave and coefficient corresponding to the current initial explosive charge; acquiring the upper limit of the shock resistance margin of the explosive, collecting the average distance between adjacent blasting holes, and calculating the blasting coherence index by combining the blasting sweep efficiency; and setting a coherence threshold value, and comparing the blasting coherence index with the set coherence threshold value. According to the method, the blasting interference risk between the adjacent blast holes is quantitatively evaluated by introducing the blasting coherence index, and the problem of explosive load design deviation caused by the fact that a conventional scheme only depends on an empirical formula or static parameters is solved; and a closed-loop feedback optimization algorithm is adopted to automatically adjust the explosive load until a coherence threshold value is met, collaborative operation guarantee of the blasting sequence is realized, and the blasting safety and the resource utilization efficiency are remarkably improved.

The invention provides an explosive pressing method for a multi-layer composite structure, which comprises the following steps of: 1, calculating the loose loading height of an explosive according to the loose loading density and the stacking density of the explosive by adopting a quality consistency method; 2, determining the design height and diameter of the auxiliary cylinder according to the loose loading height of the explosive; and thirdly, the auxiliary barrel and the explosive pressing mold are assembled, the different explosives are filled to the same height, then the auxiliary barrel is slowly pulled out, and the explosive pressing mold is used for conducting composite pressing on the multiple explosives. The explosive pressing die comprises a base, a cushion block, a die sleeve and a guide cylinder, and a positioning pin shaft is arranged on an auxiliary cylinder for coaxial positioning. The device is suitable for different explosive combinations, the process is flexible, adaptability is high, practicability and applicability are improved, and the device is simple in structure and convenient to assemble and produce.

The utility model belongs to the technical field of blast hole measuring devices, and particularly discloses a blast hole measuring device in a surface mine, which is characterized in that two sides of a base are respectively connected with a fitting plate through a telescopic assembly, and a measuring scale for measuring the distance between the fitting plates is arranged on the telescopic assembly; a movable seat is movably connected below the base and can move left and right in the axial direction of the base, a laser range finder is arranged below the movable seat through a mounting support, the mounting support is movably connected with the movable seat, the mounting support can drive the laser range finder to slide front and back in the axial direction of the movable seat, and multi-point measurement is achieved. By utilizing the device for measuring the blasting hole in the surface mine, the diameter and depth of the blasting hole can be quickly and accurately obtained, the placement of explosives can be accurately guided, the blasting effect can be improved, and obvious errors of a measurement result caused by the fact that a light path of the laser range finder is blocked by some bulges or broken stone powder in the blasting hole can be avoided.

The invention relates to the technical field of blasting, and discloses a rock mass longitudinal wave velocity inversion method based on blast hole detonation velocity measurement, which comprises the following steps: drilling a blast hole; explosive and a monitoring probe of monitoring equipment are arranged in the blast hole; detonating the explosive, monitoring and outputting a curve chart that the propagation distance of the detonation wave changes along with the propagation time through monitoring equipment, the longitudinal coordinate of the curve chart being the propagation distance of the detonation wave, and the horizontal coordinate of the curve chart being the propagation time of the detonation wave; according to the distribution condition of each rock stratum in the blast hole, the curve graph is divided into a plurality of curve segments, and each curve segment corresponds to the propagation process of detonation waves in the corresponding rock stratum; the slope of each curve section is calculated, and actually measured explosive detonation velocities of different rock stratums are obtained; and substituting the actually measured explosive detonation velocity into the theoretical formula of the explosive detonation velocity and the longitudinal wave velocity of the rock, and inverting the longitudinal wave velocity of the corresponding rock stratum. Through the inversion method provided by the invention, detonation wave monitoring and longitudinal wave velocity inversion of different rock stratums through which the blast hole passes can be completed through one-time blasting.

This invention provides a stress relief blasting method based on the control of diffuse reflection of stress waves. This method involves placing a diffuse reflection sphere at the bottom of the borehole. The sphere's surface contains raised structures, which form a diffuse reflection surface for stress waves. Compared to existing shaped charge stress relief blasting technologies, in this invention, when the explosive detonates inside the borehole, the raised structures on the diffuse reflection sphere at the bottom of the borehole allow the explosive impact to be reflected more evenly to the nearby rock mass in the stress relief section of the borehole. This results in uniform fracturing of the surrounding rock, forming a uniformly fractured zone perpendicular to the borehole axis rather than a primary crack in a specific direction. This significantly reduces the bearing capacity of the surrounding rock near the borehole in the stress relief section, shifting the stress concentration zone away from the tunnel face, reducing the risk of rockburst during deep tunnel excavation, and better ensuring construction safety.

This invention proposes a simulation material for mechanical testing of press-loaded explosives, which, by weight, is made from the following raw materials: 65.5% ammonium sulfate, 27%–33% aluminum powder, 1.5%–4% microcrystalline wax, 1%–2% butadiene rubber, and 0.2%–0.8% graphite. The compressive and tensile strengths of the explosive charge formed by this simulation material are essentially consistent with those of the charge charge formed from polyaluminum black-2 (JHL-2) explosive. It can realistically reflect the trend and limit of strength changes during mechanical testing, and provides effective reference data for mechanical performance evaluation. It also provides relatively realistic and reasonable model parameters for the digital design of the mechanical properties of press-loaded explosives. In aging tests, tensile tests, mechanical compression tests, and dynamic Brazilian tests, using this simulation material avoids contact with energetic explosive components, increasing test safety and reducing safety hazards.

The application discloses a flexible shaped charge cutting device and a magnetic attraction type rapid deployment method, relates to the technical field of shaped charge cutting, and is characterized in that the one side of a movable block is connected with an arc-shaped clamp, cutting pipes are embedded between two adjacent arc-shaped clamps, a storage cavity for explosives and a storage cavity for water are arranged in the cutting pipes, a shaped charge plate is bonded to the side of the cutting pipe close to the storage cavity for explosives, the storage cavity for explosives is filled with cutting explosives, the other side of the rectangular frame is connected with a protective plate, and a plurality of sound absorption holes are arranged on the surface of the protective plate. The bonding of the double-sided adhesive and the fixation of the arc-shaped clamp on the cutting pipe enable the cutting pipe to be closely attached to a wall surface, thereby guaranteeing the stability of cutting. The fixation of the arc-shaped clamp on the cutting pipe prevents the elastic rebound of the cutting pipe and enables the cutting pipe to be stably fixed on a curved wall surface. When cutting and blasting are performed, the high-speed jet flow formed by the shaped charge plate can optimally cut the wall surface, the device has good cutting effect, and is suitable for a wide range of applications.

The explosive charging device comprises an explosive charging barrel, a plurality of guide rods are installed at the bottom of the explosive charging barrel at equal intervals, an explosive feeding barrel is fixedly installed at the bottom of a sliding block on the guide rods, and an explosive passing pipe is communicated between the explosive charging barrel and the explosive feeding barrel. The top of the inner wall of the medicine feeding cylinder is fixedly connected with a compaction block through a telescopic cylinder, a driving mechanism for the medicine feeding cylinder to move is further fixedly installed on the outer side of the medicine loading cylinder, the driving mechanism comprises a connecting shell, the connecting shell is fixedly installed on the outer side of the medicine loading cylinder, and a screw rod is rotationally connected to the connecting shell. The explosive charging device for mining blasting is reasonable in structural design and convenient to use, the explosive adding position can be rapidly adjusted according to the distance between shot holes to be filled with explosives, and therefore the application range of the explosive charging device is effectively widened, after the explosives are added into the shot holes, the explosives can be compacted, the blasting quality can be improved, and the good using effect is achieved.

The utility model relates to the technical field of foundation pits, and discloses a foundation pit excavation presplitting blasting blast hole charging device which comprises a protective sleeve, the outer surface of the protective sleeve is slidably connected with a plurality of limiting plates distributed in the circumferential direction, and the side faces, close to each other, of the multiple limiting plates are each fixedly connected with two springs; and the other ends of the plurality of springs are fixedly connected with the protective sleeve. According to the foundation pit excavation pre-splitting blasting blast hole charging device, external stones can be blocked by installing the protective sleeve, the external stones are prevented from entering a foundation pit, the protective sleeve can be stably prevented from entering the foundation pit through cooperation of the limiting plate, and the safety of the foundation pit is improved. The explosive can be stably placed through cooperation of the installation sliding rod and the clamping piece, meanwhile, the explosive can be placed in the deep position of a foundation pit, after installation is completed, the explosive can be installed only by pulling the traction rope to make contact with clamping of the explosive, convenience and safety are achieved, and therefore the overall practicability is improved.

The utility model discloses a device for detecting the detonation velocity of on-site mixed emulsion explosive in a blast hole, and particularly relates to the technical field of explosive detonation velocity detection, the device comprises a first positioning ring and a second positioning ring, the two positioning rings with semi-ring structures are hinged through a rotating roller hinge and can be accurately positioned around the blast hole, a stable foundation is provided for explosive detonation velocity detection, and the explosive detonation velocity detection efficiency is improved. The first positioning ring is provided with a needle inlet hole, the second positioning ring is provided with a needle outlet hole, the axes of the two holes coincide, the aperture ratio of the two holes is three to one, a clear penetrating path is provided for a steel needle, and the detection precision is improved. A plurality of guide plates are encircled to form a cylindrical structure, so that the steel needle can be guided and subjected to posture control from different directions, the steel needle is ensured to advance along the axis, the device can adapt to steel needles with different diameters, the universality of the device is improved, the device is simple to mount and operate, and the assembly for measuring the detonation velocity of the emulsion explosive can be quickly completed.

The present application belongs to the technical field of rock burst prevention, and discloses a method for relieving danger by opposite energy-gathering blasting in a high-gas coal seam rock burst danger zone. A pre-pressure relief borehole is drilled in the coal seam in a roadway, and two rows of blasting boreholes are drilled above and below the pre-pressure relief borehole. Explosive charges are selected from the two rows of blasting boreholes and placed in energy-gathering covers, and the remaining boreholes are conventionally sealed and connected to extraction pipelines. Adjacent blasting boreholes are grouped and simultaneously detonated. The pre-pressure relief borehole and the blasting boreholes are arranged in rows, providing a deformation space for energy-gathering blasting, improving the utilization rate of explosive energy, and more fully breaking the coal in the area of the explosive charge blasting, which achieves better pressure relief and effectively relieves local danger. The present application performs opposite blasting on grouped boreholes in a stress concentration area, greatly improves the degree of coal fragmentation, causes the remaining gas to rapidly desorb and outflow, and uses the unblasted boreholes in the row to quickly and timely extract the pressure relief gas, avoiding gas overrun accidents in the roadway.

The present application relates to the technical field of charging system, especially to a remote control hole searching charging system and method for on-site mixed emulsion explosive truck, the guide ball is arranged in the scheme to provide guidance for the medicine delivery work of the charging pipe, the guide ball is installed through the cooperation of the support body, the placing groove cavity and the limiting cap body, so that the guide ball is convenient to disassemble, on this basis, the cleaning brush is arranged at the end of the limiting cap body, when the guide ball rolls, the dust and other impurities adhered to the guide ball are cleaned, so that the problem of jamming of the guide ball is avoided, furthermore, the position of the guide ball is adjusted according to the caliber of the blast hole through the adjusting assembly, that is, the diameter of the annular guide ball is matched with the blast hole, and the position of the guide ball is adjusted through the rotation of the inner threaded adjusting ring, so that the working flexibility is better.

The application discloses a kind of overburden separation zone reinforcement method of deformation sensitive structure goaf, including determining the boundary size and vertical height of overburden separation zone of goaf;Determine the boundary of blasting treatment of overburden separation zone of goaf;Design the amount of directional blasting explosive and the distance between explosive and the top of overburden separation zone, so that the rock and soil around explosive on the boundary of deformation sensitive structure foundation influence boundary is formed by directional blasting Throw pile;After the hole of hole drilling along the original blasthole distribution boundary to the original overburden separation zone bottom elevation and inject water reaction foaming polyurethane to form flow-plastic viscous liquid, flow-plastic viscous liquid rapidly diffuses along the upper and lower boundary of overburden separation zone and the interstice between original broken overburden separation zone accumulation block and forms blocking boundary;Deep grouting method is used to reinforce the cavity in blocking area.This method aims to reduce the disturbance of blasting on the upper soil layer and deformation sensitive structure, reduce the consumption of slurry, save engineering cost, and improve the treatment effect of goaf site.

The present application relates to a kind of explosion shock wave wave-absorbing structure and design method, it is related to underground mine mining technical field, wave-absorbing structure includes core wave-absorbing rock and the roadway arranged with core wave-absorbing rock as center, the core wave-absorbing rock is right triangle or obtuse triangle, the largest angle of its angle side is explosive magazine associated lane, the explosive magazine associated lane is connected with underground explosive sub-bank, the explosive magazine associated lane is as the entering end of explosive shock wave of explosive magazine, the largest angle of the angle of the core wave-absorbing rock triangle structure is connected with the two edge sides and opposite side of the largest angle of the angle, as shock wave gas buffer lane, safety lane associated lane is arranged in the opposite side midpoint of the largest angle of the angle. Through the engineering arrangement of this explosion shock wave wave-absorbing structure, the shock wave generated by underground explosive magazine accidental explosion can be absorbed, so as to play the role of protecting output end position main lane and personnel, equipment.

The present application relates to the technical field of tunnel blasting, in particular to a kind of energy-gathering tube smooth blasting tool and construction process.The tool includes tool main body, and the tool main body includes installation strip;Explosive roll is equipped at the side wall of installation strip;Explosive roll includes sleeve, and sleeve inside is equipped with energy-gathering tube;The one end of energy-gathering tube that extends sleeve is equipped with energy-gathering cover;Energy-gathering tube side wall is equipped with strip-shaped hole;The distance between the side wall of both ends of strip-shaped hole gradually increases from the one end of energy-gathering tube close to energy-gathering cover to the other end of energy-gathering tube.The process includes S1, mark installation hole position;S2, drill installation hole;S3, energy-gathering tube assembly;S4, middle explosive roll production;S5, bottom explosive roll production;S6, explosive roll installation;S7, hole drilling;S8, connection, detonation;For the defects in the prior art, the present application can solve the problem that the amount of powder is reduced after the energy-gathering tube is loaded into the emulsified explosive shell, and the explosion power of emulsified explosive can be improved under the condition that the amount of powder is not convenient.

The utility model relates to the technical field of on-site explosive loading, in particular to a blast hole filling length measuring device based on an on-site mixed loading ammonium nitrate fuel oil explosive truck, which is used for the mixed loading explosive truck and comprises a top spiral cylinder connected with the tail end of a top spiral of the mixed loading explosive truck. A pulley is connected to the mounting base through a pin shaft, an inner groove is formed in the periphery of the pulley, a rope slides in the inner groove, the two ends of the rope are connected with a balancing weight and a tension sensor respectively, a depth sensor is arranged in the balancing weight, and after the balancing weight is arranged at a preset position in a blast hole, explosive can be fed into the blast hole in real time; compared with the conventional mode of manually measuring the filling length of the blast hole after filling the explosive, the method provided by the utility model has the advantage that the measuring efficiency is obviously improved.

The invention belongs to the field of anti-explosion safety of hydraulic structures, and provides a method for evaluating the overall stability of an aqueduct structure under the action of an internal underwater contact explosion load, and the method comprises the steps: building a fine full-coupling analysis model of a large aqueduct under the internal underwater contact explosion; an initial load is applied, the aqueduct structure generates an initial response, and after the structural response is stable, the explosive is ignited; initial damage of the aqueduct structure under the action of the explosive shock waves is calculated, and a failure unit is deleted through a failure unit erosion technology; reconstructing a post-explosion residual structure model of the aqueduct; carrying out nonlinear static analysis on the overall stability of the aqueduct after internal contact explosion; comparing and verifying the structure response result with the simulation result of the existing analysis method; evaluating the damage grade and the overall stability of the aqueduct structure under the action of the blast load by taking the residual bearing capacity of the structure as a judgment basis; and according to a damage grade judgment result, carrying out safety assessment on the overall stability of the aqueduct after explosion. According to the invention, rapid assessment of the damage degree of the aqueduct structure under different internal contact explosion conditions is realized.

The present application provides a kind of open-air blasting hole net parameter determination method, device, electronic equipment and detection system, belongs to blasting engineering technical field.The method comprises: S1, obtains the rock mass explosibility parameter of target blast area, initial hole net parameter;S2, the parameters obtained and blasting energy parameters are input into numerical simulation model, and output prediction result;S3, obtains the measured result according to the current hole net parameter execution blasting;S4, according to the measured result and prediction result, corrects the parameters of numerical simulation model;S5, optimizes hole net parameter;S6, based on the iteration control of multi-objective optimization repeatedly executes S2-S5, and the first preset number of iterations control executes S2-S5, subsequent iteration control only executes S2 and S5;Until the prediction boulder rate exceeds the first threshold value, stop iteration, and the optimal hole net parameter with the prediction boulder rate less than the first threshold value is determined as target hole net parameter.The method is used to solve the problem of high explosive specific consumption in related art.

The application provides a charging method suitable for on-site mixed explosive, and the charging method suitable for on-site mixed explosive comprises the following steps: step one, a hole opening process of a blast hole; step two, a pre-embedding process of a charging pipe; step three, a layout process of a medicine delivery pipe; step four, a charging process; step five, a foaming process of emulsified explosive; and step six, a layout process of a fuse, in which the fuse is arranged by being connected. The charging method of the mixed explosive is composed of the hole opening process of the blast hole, the pre-embedding process of the charging pipe, the layout process of the medicine delivery pipe, the charging process, the foaming process of the emulsified explosive and the layout process of the fuse. The method can match the withdrawal speed of the pipe and the charging speed, improves the automation level of the on-site mixed explosive vehicle for underground mines, and effectively reduces the labor intensity.

The invention discloses a mine blasting detonating cord initiating explosive package automatic device and a construction technology. The device comprises a detonating cord routing mechanism (comprising a fixed pulley module, a detonating cord pay-off / take-up device and a gear), an explosive binding mechanism (comprising a manual rubber winding device, a latex explosive guide rail and a positioning piece), a control system and a safety protection device. The manual rubber winding device is in transmission with a synchronous belt through a gear, so that the emulsion explosive and the detonating cord are accurately wound by a rubber belt. The construction process comprises the steps of preparing (charging and debugging), starting (taking up a detonating cord), binding (putting explosive, propelling to wind glue and cutting off an adhesive tape), checking (firmness and precision) and repeating to form the initiating explosive package. The problems that the existing operation efficiency is low, and the quality is greatly influenced by personnel / seasons are solved, the labor cost is reduced (8 persons are reduced to 3 persons), the operation efficiency is improved (24 persons are reduced to 3 persons per day) and the quality stability are improved, and the electromagnetic safety specification of a blasting site is met.

The invention discloses a blast hole retaining wall charging method for improving the blasting effect of a fractured rock mass, which comprises a support frame (5) positioned on the ground on the outer side of an orifice of a blast hole (1), and is characterized in that a cross brace (6) is arranged on the support frame (5), a hanging ring (7) is arranged below the cross brace (6), and a hook (8) is arranged below the hanging ring (7); and a hole wall retainer (3) is arranged in the blast hole (1) at the position corresponding to the rock mass crushing section (2), and is hung on a hook (8) below the hanging ring (7) through a hemp rope or other anti-static (anti-static) ropes (4). The use amount of powdery explosives and the blasting cost can be reduced, secondary hazards such as blasting vibration can be reduced, the blasting rock breaking effect and the blasting quality can be effectively improved, the method can be widely applied to broken rock mass blasting in the fields of surface mines, underground mines, water conservancy and hydropower, transportation and the like, the explosive loading amount of blast holes can be reduced by 10%-16% after use, and the blasting quality is improved. And the blasting operation cost is effectively reduced.

The invention discloses a large-size tin-phosphor bronze / Q235B composite plate and a preparation method thereof, and belongs to the field of material forming, the method comprises the following steps: by taking a Q235B steel plate as a base plate and a tin-phosphor bronze plate as a compound plate, sequentially laying a base plate, the Q235B steel plate, a support column, the tin-phosphor bronze plate, a protective layer, a fence structure, a low-detonation-velocity rock expanded ammonium nitrate fuel oil explosive layer and an inert layer on an explosion field from bottom to top, and forming the composite plate. And then the tin-phosphor bronze plate and the Q235B steel plate are subjected to metallurgical bonding after high-speed collision by detonating the explosive, the large-size tin-phosphor bronze / Q235B composite plate is obtained, the interface bonding rate of the obtained composite plate is larger than 98%, the interface shear strength exceeds 274 MPa, and the composite plate has the advantages of excellent high strength, wear resistance and the like of tin-phosphor bronze and low cost of Q235B steel.

The application provides a chute blocking blasting charge structure and a blasting method, and relates to the technical field of blasting, and comprises an explosion device and an ignition device.The explosion device comprises an umbrella-shaped explosion assembly and a columnar explosion assembly, and the columnar explosion assembly is located between the umbrella-shaped explosion assembly and the ignition device.The umbrella-shaped explosion assembly comprises a plurality of limiting frameworks and first explosives fixed on the surfaces of the limiting frameworks, adjacent two limiting frameworks have a predetermined angle, and a plurality of the limiting frameworks form an umbrella-shaped structure at the lower end of a blocking body.The application greatly improves the effect of blasting construction, ensures the safety of blasting, improves the efficiency of underground blasting construction, is convenient for on-site construction, can effectively deal with long-distance blocking of a main chute shaft, and is well applied in mines.

The invention belongs to the technical field of fire extinguishing test systems, and discloses a rapid fire extinguishing test system for explosive fire and a test method thereof.The rapid fire extinguishing test system comprises a storage box, an electromagnetic valve is arranged above the storage box and fixedly communicated with a spray head, and a control mechanism, an ignition mechanism and a water supply mechanism are arranged on one side of the storage box; the control mechanism is used for controlling the electromagnetic valve, the ignition mechanism and the water supply mechanism and detecting whether the gunpowder is burnt or not, and the ignition mechanism is used for igniting the gunpowder; the controller is arranged on one side of the storage box and is in circuit connection with the electromagnetic valve, the ignition mechanism and the water supply mechanism, and the high-speed detector is arranged on one side of the storage box and is in circuit connection with the control mechanism. According to the method and the device, through improvement of the prior art, the optimal fire extinguishing response time can be judged according to different response time, different fire extinguishing water pressures and the residual weight of the gunpowder under different conditions, so that the optimal fire extinguishing scheme is selected, and the fire extinguishing effect is favorably improved.