447 results about "TEX-explosive" patented technology

The invention provides a tunnel blasting scheme determining method and device, and relates to the technical field of tunnel engineering data processing.The method compensates stress wave attenuation caused by large-aperture blast hole air gaps through radial explosive density gradient design, so that the energy utilization rate is higher; the axial charge density is dynamically adjusted on the basis of a three-dimensional clamping coefficient, the problem that energy of a hole bottom high constraint area is insufficient is solved, the explosive density and the hole net topology are collaboratively optimized, the contour forming quality is greatly improved, back break is reduced, and therefore the cost is reduced, and the time is shortened. Due to the fact that explosive and hole net parameters are optimized, energy distribution is more reasonable, blasting disturbance is reduced, stability of surrounding rock is enhanced, safety in a hole is greatly improved, and casualties are reduced.

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 relates to the technical field of arc shaped energy-gathered blasting parameter design, and provides an arc shaped energy-gathered blasting parameter design method under a complex crustal stress condition, which comprises the following steps: establishing a double-hole blasting three-dimensional model comprising a rock mass, an arc explosive, an energy-gathered pipe and coupled air, applying a crustal stress boundary condition and carrying out stress initialization; setting material model parameters based on the test data; performing fluid-structure interaction dynamic response numerical simulation on the model by adopting LS-DYNA to obtain stress and strain response caused by blasting; and establishing evaluation indexes based on tensile stress, compressive stress and through crack formation, carrying out sensitivity analysis and optimization adjustment on key blasting parameters such as blast hole spacing, delayed detonation time, explosive loading amount and coupling coefficient, and finally determining an optimal blasting parameter combination in different stress states. The method can effectively meet the blasting operation requirement under the complex ground stress condition, the presplitting quality and the rock mass stability are remarkably improved, and the method has wide engineering application prospects.

The present invention discloses a mobile device for safely unblocking a mine chute in the field of mining machinery technology, comprising: a mobile device, an explosives mounting assembly is provided on the mobile device, the explosives mounting assembly includes a telescopic rod; a winding wheel is provided on the telescopic rod, and the winding wheel is provided with a flexible connecting member for driving the telescopic rod to extend; a rope reel is provided on the explosives mounting assembly for driving the winding wheel to rotate; the rope reel includes a rope reel body, a spline shaft slidingly arranged on the rope reel body, a first drive assembly for driving the spline shaft to slide, and a second drive assembly for driving the spline shaft to rotate; the present invention drives the shift fork to rotate by the driving member, so that the shift fork moves with the spline shaft to the inside of the rope reel body, realizes the retraction of the spline shaft to separate from the winding wheel, and through the above method, the rope reel itself has the function of separating from the external winding wheel, does not rely on external facilities, and reduces the probability of the rope reel and the winding wheel being unable to be separated.

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 present invention discloses a method for correcting explosive initial conditions for numerical simulation of underwater explosions. The explosive is approximated as a sphere, and a computational model for a free-field spherically symmetric underwater explosion is established. Initial parameters of the explosive, including initial density and initial internal energy per unit mass of the explosive, are input into the JWL equation of state to obtain preliminary pressure-time curves at different spatial positions. The peak value of the shock wave pressure is extracted and compared with the results of an experiment or empirical formula. If the error does not exceed 5%, the initial internal energy per unit mass of the explosive is maintained unchanged; otherwise, the initial internal energy per unit mass of the explosive is adjusted until the error does not exceed 5%. The bubble pulsation period is determined and compared with the results of an experiment or empirical formula. If the error does not exceed 5%, the initial density of the explosive is maintained unchanged; otherwise, the initial density of the explosive is adjusted until the error does not exceed 5%. The present invention can accurately predict the peak value of the shock wave pressure and the bubble pulsation period, has the advantages of low cost and high efficiency, and can provide more accurate load input for the calculation of three-dimensional underwater explosion models.

The invention provides a detonation pressure optical testing device for a micro-dose powdery explosive, which comprises a rotating mirror type scanning camera and an explosive detonation unit, and is characterized in that the rotating mirror type scanning camera is used for collecting a shock wave motion trail image when the powdery explosive is detonated; the explosive detonating unit comprises an organic glass column body and a high-pressure exploder, an explosive charging hole with an open top is formed in the organic glass column body in the axial direction, a stress wave adjusting rod is arranged in the explosive charging hole in a penetrating mode, and the bottom face of the stress wave adjusting rod can make contact with powdery explosives charged into the explosive charging hole; a first detonating hole and a second detonating hole are coaxially formed in the organic glass column body in the radial direction, and both the first detonating hole and the second detonating hole communicate with the charging hole; the heating wire penetrating through the first detonating hole, the charging hole and the second detonating hole can make contact with the powdery explosive in the charging hole, and the two ends of the heating wire are connected with the positive electrode and the negative electrode of the high-pressure exploder correspondingly. According to the invention, a traditional detonation mode is not needed, the interference of the detonator and the explosion expanding explosive on the measurement process of the sample with the small explosive quantity is solved, and the test convenience and the test precision are 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 discloses a cut blasting method, and relates to the technical field of tunneling, a first cut hole extends from a rock mass area related to a current excavation cycle to a rock mass area related to a next excavation cycle, after a first excavation cycle is completed, a sub-surface has a temporary cavity in each subsequent excavation cycle process, and a second cut hole extends from the rock mass area related to the next excavation cycle to the rock mass area related to the next excavation cycle. The crustal stress on the boundary of the temporary cavity is released to cause the crustal stress redistribution of the rock mass in the region involved in the next excavation cycle, so that the temporary cavity forms a pressure stress concentration region in the minimum principal stress direction, and the strength of the rock mass in the region involved in the next excavation cycle is reduced; the temporary cavity and the rock mass damage area can be used for assisting in completing rock breaking excavation in the subsequent excavation cycle, and the amount of explosives needed in the whole excavation process is reduced; and the blasting parameters of the slotting hole group required by the next excavation cycle can be adjusted in a targeted manner according to the geometric parameters, so that the problem that the slotting area is formed too large or too small due to blind reduction of the explosive quantity is solved, and the forming quality of the slotting area is ensured.

The invention discloses a phosphorite mining method which comprises the following steps: constructing and cutting an uphill along a top plate of an ore body from a lower layered gate way to an upper layered gate way, and supporting by adopting a resin anchor rod, a reinforcing mesh and a mining anchor cable; cutting groove construction is conducted, medium-length holes are formed in the lower layered gate way, explosives are loaded in the medium-length holes to conduct blasting layer by layer, a cut uphill bottom plate is continuously lowered till an ore body bottom plate is reached, and the cutting grooves are formed; fan-shaped medium-length holes are constructed in the lower layered gate way, a plurality of rows of fan-shaped medium-length holes are formed in the vertical direction, a plurality of holes are formed in each row of fan-shaped medium-length holes in the vertical direction, blasting is conducted with the cutting groove as a vertical free face, and the fan-shaped medium-length holes are blasted in batches; and charging powder in the lower layered roadway, and after blasting, entering a stope by adopting a remote control forklift for ore removal. The vertical free surface blasting technology is adopted for blasting the medium-length holes in batches, and the method has the advantages that the top plate operation safety is improved, the mining period is shortened, and the ore recovery rate is increased.

The invention relates to the technical field of data processing, and discloses a high-confining-pressure blasting model test method and system for simulating a single-free-surface clamping effect. The method comprises the following steps: preparing a single-free-surface model sample with a preset blast hole by regulating and controlling the proportion of cement mortar, performing three-way constraint loading by utilizing a hydraulic confining pressure system to form a stable clamping state, and filling trace explosive and blocking and sealing the hole to construct a complete blasting model. Multi-parameter synchronous monitoring is adopted to collect vibration waveform and confining pressure change data, and a time-frequency domain analysis algorithm is applied to identify a single free surface clamping effect and obtain blasting failure mode parameters under the influence of confining pressure. The technical problem that an existing blasting model test cannot accurately simulate the single-free-surface clamping constraint condition of underground engineering and cannot quantitatively recognize the influence rule of confining pressure on a blasting failure mode is solved.

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 invention discloses a prediction model-based saturated zone low-temperature rock mass blasting parameter optimization method, which comprises the following steps of S1, data acquisition and sample preparation: acquiring a rock mass sample, and obtaining rock mass mechanical parameters and energy evolution data through an indoor static test and a dynamic test; according to the method, the blasting parameters are optimized by establishing the prediction model, so that the blasting lumpiness of the saturated zone low-temperature rock mass is more reasonable, and the shoveling efficiency is improved; on the basis of an explosibility grading system and a blasting parameter optimization model, parameters such as explosive unit consumption can be reasonably determined, waste of explosives is avoided, and the blasting production cost is reduced; the boulder rate and the root rate are effectively reduced, and the blasting quality is improved; the method can be popularized in mine engineering projects, and technical reference is provided for similar projects; the intrinsic safety of on-site blasting construction is improved by reducing the boulder rate and the flying stone distance of a blasting site.

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 utility model relates to the technical field of directional blasting, in particular to a fixing structure for directional blasting, which comprises a base, the outer wall of the base is rotatably connected with the inner wall of a connecting piece, the top of the connecting piece is fixedly connected with the bottom of the center of a supporting piece, and the inner wall of the connecting piece is rotatably connected with the outer wall of a transmission piece. The transmission part comprises a transmission block, a limiting groove, four second fixing blocks, four second fixing shafts and four transmission rods, the adjusting pipe is rotated to move downwards along the axis of the stud, the adjusting pipe drives the transmission block to move downwards together through the limiting ring when moving, the ends, connected with the second fixing shafts, of the transmission rods move downwards, and the transmission rods are driven to move downwards. The other end of the transmission rod drives the third fixing block to move inwards along the sliding groove, the four sets of clamping blocks jointly move inwards to fix the explosive or the gun barrel, a user only needs to rotate the adjusting pipe to fix the explosive or the gun barrel, and the clamping force of the clamping blocks to the explosive or the gun barrel can be accurately adjusted through the transmission mechanism.

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 relates to the technical field of auxiliary charging, and discloses an auxiliary charging tool for expanded medicine, which comprises a large circular ring, the bottom end of the large circular ring is fixedly connected with a funnel, the bottom end of the funnel is fixedly connected with a small circular ring, and the funnel is prepared by taking anti-static cloth as a raw material. The large circular ring and the small circular ring are both made of metal, the diameter of the large circular ring is 400 mm, the diameter of the small circular ring is 110 mm, and the height of the funnel is 400 mm. According to the utility model, before charging, the small circular ring of the charging auxiliary tool is put into a blast hole, the large circular ring is supported around the blast hole, and then expanded explosive is charged into the blast hole through the large circular ring, so that workers can more quickly and accurately charge the expanded explosive into the blast hole, the charging time is shortened, the working efficiency is improved, and the scattering of the expanded explosive is reduced; the tool is favorable for reducing the waste of materials, so that the cost of blasting operation is reduced.

The invention provides a method for preparing a high-explosive hot-pressing composite explosive from aluminum-boron alloy microspheres. Comprising the following steps: step 1, preparing spherical submicron aluminum-boron alloy microspheres; and 2, preparing the high-explosion-heat composite explosive column. According to the preparation method, the metal aluminum powder and the amorphous boron powder are alloyed through a high-energy mechanical ball milling method under the action of long-time and violent mechanical force, the aluminum-boron alloy microspheres with the high sphericity degree are prepared, the microcosmic grain size of the metal aluminum powder and the boron powder is reduced to the nanometer size, and therefore the aluminum-boron alloy microspheres with the high sphericity degree are obtained. The aluminum-boron alloy microspheres with the nanoscale microcosmic grain size have very low ignition temperature and very high combustion speed, so that the aluminum-boron alloy microspheres can sufficiently release most heat in the transient detonation process of the high explosive, and finally, the actually measured explosion heat of the composite explosive is very close to the theoretically calculated explosion heat. In addition, the spherical structure of the aluminum-boron alloy microspheres is very beneficial to charging, and is more beneficial to reducing the mechanical sensitivity of the composite explosive.

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 invention discloses an underground engineering protection structure and method for enhancing the total reflection of explosion stress waves, belonging to the technical field of underground engineering anti-explosion protection. The structure comprises a plurality of fracturing devices arranged in multiple rows on a horizontal plane projection, with adjacent rows of fracturing devices arranged in a staggered manner. The fracturing devices comprise a fracturing disk and a conduit, the conduit being connected to the center of the fracturing disk, and the fracturing disks on the adjacent rows of fracturing devices being orthogonal. The conduit is provided with a detonating cord, and the chamber inside the fracturing disk comprises an annular explosive chamber arranged on the periphery and an annular detonator chamber arranged between the explosive chamber and the conduit. When the fracturing disk is in an inclined state and undergoes a fracturing explosion, a fracture surface extending in an inclined direction is formed. When the explosion stress wave propagates to the lower surrounding rock, it forms a large-angle incidence with these inclined intersecting fracture surfaces. According to wave theory, the inclined fracture surface greatly increases the reflection effect of the stress wave, effectively reducing the impact of the explosion on the underground engineering.