950results about "Blasting cartridges" patented technology

A gas generator includes a housing, one or more first discharge ports provided in the housing and configured to discharge the combustion gas, one or more second discharge ports provided in the housing configured to discharge the combustion gas, and a closing member covering at least one of the one or more first discharge ports and at least one of the one or more second discharge ports together. The closing member includes a portion covering the at least one first discharge port and configured to rupture at a first rupture pressure and a portion covering the at least one second discharge port and configured to rupture at a second rupture pressure, and the closing member includes a breakage assisting portion configured to reduce a strength of the closing member at at least a boundary portion between the at least one first discharge port and the at least one second discharge port.

Some implementations include an apparatus comprising an explosive material configured to detonate; a liner in contact with the explosive material, the liner configured to, after detonation of the explosive material, form jets to perforate a tubular disposed in a subsurface borehole; a reactive material configured to release energy in response to detonation of the explosive material; and a case in contact with a portion of the reactive material and configured to surround the explosive material, the liner, and the reactive material.

An explosive downhole tool includes a housing having an upper housing part on one side of a window section and a lower housing part on an opposite side of the window section. An explosive charge is provided within the housing for cutting or expanding the wall of the tubular. The majority of outer surface of at least one of the upper and lower housing part in cross-section is rounded so as to be devoid of corners. The rounded surface eliminates the presence of sharp corners that may catch on restrictions or protrusions in a wellbore so that the downhole tool is more easily conveyable within a wellbore. Another explosive downhole tool includes fins extending from the housing. The fins have a height that decreases in a direction away from the housing. The shape of the fins enables the downhole tool to be more easily conveyable within the wellbore.

The invention discloses an anti-static flexible fracturing rock breaking pipe based on a conductive oxygenating conduit, which comprises a flexible outer sleeve film with two closed ends and filled with an adsorbing material combustion agent, and further comprises the conductive oxygenating conduit penetrating into the flexible outer sleeve film from the top of the flexible outer sleeve film, an excitation wire and an exhaust pipe, the excitation wire is connected with an electric ignition device, and the electric ignition device is positioned in the flexible outer sleeve film and is in contact with the adsorption material combustion agent; the outer wall of the conductive oxygenation conduit is connected with a conductive unit. The invention further discloses a rock breaking method using the anti-static flexible fracturing rock breaking pipe based on the conductive oxygenating guide pipe, the conductive unit is arranged on the conductive oxygenating guide pipe and makes contact with the ground for conduction, static electricity generated in the filling process of liquid oxygen or pressurized high-purity liquid oxygen can be guided out and eliminated, and the anti-static flexible fracturing rock breaking pipe based on the conductive oxygenating guide pipe can be used for breaking rocks. Static electricity generated in the filling process of liquid oxygen or high-purity liquid oxygen with pressure can be conducted away and eliminated more efficiently, timely and continuously, and the risk of safety accidents caused by the static electricity is greatly reduced.

In general, in one aspect, embodiments relate to an electrical contact that includes a contact plate, a support plate, and three or more bends disposed between the contact plate and the support plate to counteract a force applied to the contact plate when engaged by a contact pin, where the electrical contact is configured to convey a detonating signal through an electrical feedthrough extending through at least a bulkhead of two or more perforating guns.

The invention relates to a rock mass gas blasting method based on stress wave guidance. The method is suitable for the technical field of geotechnical engineering and mining. The technical problem to be solved by the invention is to provide the rock mass gas blasting method based on stress wave guidance. According to the technical scheme, the method comprises the steps that stress wave simulation is conducted on the basis of geological conditions of a target rock mass, and a stress wave simulation result of the rock mass is obtained; determining an arrangement mode and an excitation working mode of an ultrasonic excitation source and a low-frequency excitation source based on the type of the rock mass, the crack propagation target depth and the stress wave simulation result of the rock mass; wherein the low-frequency excitation source is used for reducing the rigidity of the surface of a rock mass through low-frequency excitation, increasing micro-deformation and initial micro-cracks of the rock mass, creating conditions for propagation of ultrasonic waves and locally guiding the formation position of the cracks; the ultrasonic excitation source is used for enabling ultrasonic waves to effectively reach the deep layer of the rock mass by utilizing the high penetrability of the ultrasonic waves to excite the expansion of microcracks.

The present invention is directed toward an addressable ignition stage which produces an output sufficient to detonate a secondary explosive, generally. The present invention comprises addressability and ignition functions that may be used together or separately to incorporate a high-power resistor with a thermally conductive substrate allowing for operation at high temperatures for ignition. The ignition stage is amendable to high volume production, exhibits a high degree of reliability, robustness and operational dependability for use alone or configurable into existing technology.

The invention belongs to the field of semiconductor bridge current protection, and particularly relates to a semiconductor bridge current protection method based on a vanadium dioxide thick film thermistor. Firstly, copper, nickel and gold interdigital electrodes are deposited and grown on an aluminum oxide ceramic substrate, then a methanol solution of vanadyl acetylacetonate is sprayed on the surface of the heated interdigital electrode, a vanadium dioxide thermistor device is obtained, the vanadium dioxide thermistor device is connected with a semiconductor bridge in parallel, and current protection of the semiconductor bridge thermistor is achieved. Vanadium dioxide with a single valence state can be synthesized by adjusting the synthesis method and process, M-phase vanadium dioxide is synthesized on the interdigital electrode in one step, the vanadium dioxide prepared by the method avoids the tedious process that vanadium dioxide powder is firstly prepared and then transplanted to the surface of the interdigital electrode, and the preparation method is simple and convenient to operate. And the vanadium dioxide can be more stably combined on the surface of the interdigital electrode.

A fuse-less ignition system for fireworks. An ignitor module is provided that is insertable into a firework and includes: a first end having an interface adapted to reside on an exterior surface of the firework for receiving a plug; a set of electrical contacts adapted to receive electricity from the plug; a heat element coupled to the electrical contacts and adapted to heat in response to received electricity; and a cavity adjacent to the heat element containing a pyrotechnic material, the pyrotechnic material adapted to ignite in response to a heating of the heat element.

The utility model relates to an explosion activation device, emergency ejection seat and aircraft, wherein the explosion activation device comprises a conductive shell and a power supply, the interior of the conductive shell is slidably connected with an actuator, the interior of the actuator is provided with a plunger cavity, the interior of the plunger cavity is slidably connected with a plunger, the actuator is slidably connected with a limiting ball, and the limiting ball is connected with the power supply. The actuator and the plunger are clamped or separated through a limiting ball, an insulating base is arranged on the conductive shell, an electric contact point is arranged on the insulating base, one end, close to the electric contact point, of the plunger is in contact with or separated from the electric contact point, and the conductive shell, the actuator, the limiting ball and the plunger are all conductive parts. The anode of the power supply is connected with the conductive shell, and the cathode of the power supply is connected with the electric contact. According to the explosion activation device, the activation function can be achieved only by pulling the actuator to change the connection state between the actuator and the plunger, and the structure of the explosion activation device is simplified.

The invention discloses a typical warhead-fuze collaborative weapon system, and belongs to the technical field of ammunition fuze, the typical warhead-fuze collaborative weapon system comprises a shell, a fuze module, a guidance cabin, a warhead, a detonation module and a fuel cabin are arranged in the shell, the fuze module is located at one end of the shell, the fuel cabin is located at the other end of the shell, and the warhead is located in the middle of the shell; the guidance cabin is located between the fuze module and the warhead, and the detonation module is located between the warhead and the fuel cabin. According to the typical warhead-fuze collaborative weapon system, the collaborative performance is optimized, and efficient collaboration among the warhead, the fuze module and the explosion tube is achieved through innovative module arrangement and connection design; the environmental adaptability is improved, structural strengthening and adaptability design are carried out on key modules of the system for high-altitude, high-temperature and other complex combat environments, and reliable operation of the system is ensured; and through the heat insulation design and multi-layer protection, the isolation performance of the warhead and the fuel cabin is improved, and accidental explosion caused by heat transfer is prevented.

A method of assembling a primer for a firearm cartridge including the steps of providing a primer cup including a cup base with a circular sidewall extending perpendicularly upward from a perimeter edge thereof, to a rim. Providing an anvil having an anvil base and pressing the anvil into the primer cup with the anvil base spaced apart from the cup base to form a primer gap therebetween. Providing a slurry including a primer composition and a carrier liquid and introducing a controlled volume of the slurry into the primer cup over the anvil. Drying the slurry in the primer cup to remove the liquid carrier and leave a deposit of the primer composition in the primer gap.

A firearm sound suppression system may include, but is not limited to: a tubular body portion defining an entry aperture and an exit aperture; one or more baffles disposed inside the tubular body portion at locations along the length of the tubular body portion, the one or more baffles including: a central aperture, wherein the entry aperture, the one or more baffles, and the exit aperture are co-aligned to form a bore through the firearm sound suppression device.

A method for producing a tandem sub for a perforating gun system includes positioning an electrically conductive signal bar in a central passage of a tubular housing of the tandem sub, and injecting a mold material into an annulus formed between an outer surface of the signal bar and an inner surface of the tubular housing that sealably adheres to both the signal bar and the tubular housing.

A fuse-less ignition system for fireworks. An ignitor module is provided that is insertable into a firework and includes: a first end having an interface adapted to reside on an exterior surface of the firework for receiving a plug; a set of electrical contacts adapted to receive electricity from the plug; a heat element coupled to the electrical contacts and adapted to heat in response to received electricity; and a cavity adjacent to the heat element containing a pyrotechnic material, the pyrotechnic material adapted to ignite in response to a heating of the heat element.

A progressive press for loading or reloading ammunition casings has a base containing a reversible press motor with speed control, and vertically-oriented nuts mechanically connected to the motor and having vertically-oriented power screws extending from the nuts. The screws are affixed to a tool head which can receive dies and other tools for loading and / or reloading ammunition casings. A rotatable shell plate receives ammunition casings and advances the casings through a series of operations performed by different dies and other tools. Using a control system, the press motor can be operated to extend the screws and lift the tool head when the shell plate is advanced, and to retract the screws and tool head to perform operations on the casings when the shell plate is stationary.

The invention concerns a blasting system (1) configured for explosive material charging in a borehole (3). The system (1) comprises a detonator support device (5) configured to be inserted into the borehole (3) by means of a charging hose (7); a main body (9) of the detonator support device (5) comprises a channel (8) oriented along a main body centre line (CL) extending along the borehole extension during said explosive material charging; an openable cover device (14) covering the channel (8) is configured to come into contact with the charging hose (7) in motion for pushing the main body (9) along the borehole (3), wherein the charging hose (7) in motion is configured to open the openable cover device (14) whilst a stopping arrangement (13) stops the main body (9). The invention also concerns a method of explosive material charging in a borehole (3) by means of the blasting system (1).

An ignition device includes an igniter that accommodates an ignition charge to be ignited by energization, and a holder that includes an insertion port for inserting the igniter, and is integrated with the igniter by fitting the igniter from the insertion port and press-fitting a tube body into a press-fitting portion. An end portion of the tube body is fitted into an annular groove formed in a bore, and a labyrinth structure is formed by an inner wall portion, an end surface portion, and an outer wall portion of the end portion, and the annular groove.

An initiator system for actuating a wellbore setting tool for a plug or a packer. The initiator system includes a firing head that comprises a tubular body defining a bore, wherein the bore has an upstream chamber and a downstream chamber. A tubular bulkhead that resides within the bore of the firing head. The initiator system further includes a signal pin that has an elongated shaft residing within the tubular bulkhead. The initiator system also includes an ignition tube forming an ignition chamber between upstream and downstream ends. The upstream end of the ignition tube receives a second end of the tubular bulkhead. The initiator system further includes an ignitor that is in electrical communication with the signal pin. The initiator system also has an explosive component which resides within the ignition chamber at the downstream end, and is configured to initiate when the signal pin transmits an actuation signal to the igniter.

The invention discloses a directional fracturing device and a directional fracturing method.The directional fracturing device comprises a delay controller, a storage structure and a plurality of directional fracturing pipes, the storage structure is used for storing liquefied gas, the storage structure is connected with the directional fracturing pipes, and the directional fracturing pipes are connected with the delay controller. The directional fracturing pipe is used for introducing liquefied gas into the directional fracturing pipe, the directional fracturing pipe is provided with an energy release hole, the delay controller is electrically connected with the directional fracturing pipe, and the delay controller is used for igniting the directional fracturing pipe and controlling the detonating sequence of the directional fracturing pipe. According to the directional fracturing device and the directional fracturing method, liquefied gas phase change, precise delay blasting and the directional fracturing technology are combined, and more efficient and safer blasting operation can be achieved.

The present invention provides a carbon dioxide phase change directional pressure relief fracturing device for excavation and a method for using the same. The fracturing device includes a liquid storage pipe for storing liquid carbon dioxide, a filling valve, a heater and an explosion relief head; the explosion relief head includes an explosion relief pipeline of a Y-shaped structure, including a first pipeline, a second pipeline and a third pipeline that are interconnected, one end of the first pipeline is connected to the liquid storage pipe, the other end of the first pipeline is obliquely connected to the head end of the second pipeline and the third pipeline, the ends of the second pipeline and the third pipeline face the free surface of the tunnel to be excavated, the ends of the second pipeline and the third pipeline are explosion relief ports, carbon dioxide gas is vented through the explosion relief ports, and the angle between the explosion relief port and the borehole axis is less than 90°. The fracturing device is fixed in an inverted manner in the borehole, so that the explosion relief direction can impact the borehole wall along an oblique angle during the explosion process, and has the advantage that the shock wave is released toward the orifice along the reflection angle, thereby solving the problem of the stability of the existing fracturing device in the borehole. It not only reduces energy loss, but also eliminates the risk of fracturing device recoil.

A downhole system for conveying an explosive tool within a wellbore and reducing damage to other tools of the downhole system. The downhole system comprises a downhole tool string configured for conveyance within a wellbore, wherein the downhole tool string comprises upper tools, a lower tool comprising an explosive charge, and a sub between the upper tools and the lower tool. The sub is configured to attenuate a shock wave caused by the explosive charge when detonated to thereby reduce damage to the upper tools caused by the shock wave. The sub comprises an axial bore and a plurality of radial bores extending between the axial bore and a space external to the sub.

Progressive ammunition press system, components thereof, and associated methods. The press system may include a press control system integrated with the press. The press may include a case carriage including a case carrier supported by a bearing. Case retainer gates may be provided for retaining cases in the case carrier. A bullet feeding system can be arranged to permit bullet feeding and seating in a single station of the press. A primer feeder can be self-contained, gear-driven, and / or recirculating.

A gas generator includes a housing main body made of metal, a holder assembly, and an igniter. The holder assembly includes a holder portion made of metal and a connector portion made of resin. The holder portion includes a first barrel portion and an annular projection. The connector portion includes a second barrel portion and a cylindrical portion. The cylindrical portion is inserted in the housing main body and externally attached to the first barrel portion. As a portion of the housing main body corresponding to the cylindrical portion is decreased in diameter, the cylindrical portion is compressed by being sandwiched between the portion of the housing main body decreased in diameter and the first barrel portion so as to seal a gap between the housing main body and the first barrel portion.

The invention discloses a multi-stage damage warhead and a design method thereof, and belongs to the technical field of military equipment.The multi-stage damage warhead comprises a fuze system, a multi-stage damage warhead module is arranged on one side of the fuze system, the multi-stage damage warhead module comprises a shell, and a first-stage damage unit, a second-stage damage unit and a third-stage damage unit are arranged in the shell; the second-level damage unit is located between the first-level damage unit and the third-level damage unit, explosion-proof layers are arranged between the first-level damage unit and the second-level damage unit and between the second-level damage unit and the third-level damage unit, and first detonating devices are arranged in the centers of the explosion-proof layers. According to the multi-stage damage warhead, the design method thereof and the fuze system, staged triggering of the multi-stage damage module can be achieved, it is ensured that the multi-stage damage module is started according to a preset plan, the multi-stage damage module can select the corresponding damage unit to attack according to different characteristics of a target, and the multi-stage damage warhead is high in safety. Therefore, the hard target and the soft target can be efficiently damaged.

The invention discloses a cutting-free-surface-free blasting device for a complex ore body and a mining method, and relates to the technical field of blasting engineering and mining. The invention provides a blasting device and a mining method using the same in order to solve the problem that a preset free surface is difficult to form on an ore body in complex geology. The blasting device comprises shaped charge units of a specific structure or combination, such as an axial shaped charge unit and an annular / radial shaped charge unit, and part of the units can be integrated into a multi-point detonating structure. According to the mining method, the device is utilized, three-dimensional blast hole arrangement is adopted, energy gathering units with different functions are arranged at specific blast hole positions, and in-hole multi-point detonation and inter-hole millisecond detonation technologies are combined, so that efficient and directional crushing of ore rocks under the condition of no preset free surface is achieved. The device is matched with the method, the difficulty, the cost and the risk of complex ore body mining are reduced, and the efficiency and the safety are improved.

The utility model provides a bamboo joint type oxygen inhalation inner core assembly and a fracturing pipe, relates to the technical field of expansion fracturing, and comprises an inner core, the inner core comprises an infusion tube, liquid outlets are arranged in the circumferential direction of the infusion tube, a first quick connector with a central through hole is arranged at the lower end of the infusion tube, a medium layer is arranged outside the infusion tube, and a second quick connector with a central through hole is arranged outside the medium layer. The dielectric layer is used for absorbing liquid oxygen in the infusion tube; the at least one electronic excitation unit comprises an ignition head and an excitation cartridge bag, the excitation cartridge bag is arranged outside the dielectric layer, and the ignition head is used for igniting the excitation cartridge bag; the inner cores are connected end to end through first quick connectors. The oxygen inhalation inner core assembly is formed by sequentially connecting the multiple inner cores end to end, so that the oxygen inhalation inner core assembly can be flexibly adjusted and assembled in the length direction and the radial direction according to the length and the diameter of the fracturing pipe.

Provided herein are mass focusing shaped charges and related methods useful for disrupting targets in either underwater or on land. The mass focusing shaped charges comprise an explosives shell having an explosives shell surface, wherein at least a portion is curved and defines an inner volume configured to contain an inner volume of fluid or a metal liner. A distal body is comprising a SMART material is positioned between the inner volume of fluid and a to-be-disrupted target. A conformable layer of explosives conforms to at least a portion of a surface of the explosives shell, the conformable layer of explosives configured for explosive initiation by a detonator. Upon explosive initiation the inner volume of fluid or metal liner is forcefully ejected to form a fluid or metal jet in a direction through the distal body and toward the target.

The present invention discloses a design method for a thermal feedback mechanism energy conversion element chip, comprising at least the following steps: Step S1: preparing a substrate layer; Step S2: forming an insulating layer on the substrate layer; Step S3: placing an energy conversion element and at least one thermistor on the insulating layer; Step S4: establishing a parallel electrical connection between the energy conversion element and the thermistor; and Step S5: monolithically integrating the thermistor into a non-polar, two-terminal device. The thermistor is a thermally coupled resistive switch configured to assume a high-resistance or low-resistance state depending on its sensed temperature, with its high-resistance state resistance being much greater than that of the energy conversion element. The present invention eliminates heat accumulation in the energy conversion element chip through the monolithically integrated thermistor, significantly simplifying the complexity of the pyrotechnic device system and improving system reliability.

The present invention is directed toward an addressable ignition stage which produces an output sufficient to detonate a secondary explosive, generally. The present invention comprises addressability and ignition functions that may be used together or separately to incorporate a high-power resistor with a thermally conductive substrate allowing for operation at high temperatures for ignition. The ignition stage is amendable to high volume production, exhibits a high degree of reliability, robustness and operational dependability for use alone or configurable into existing technology.