12results about How to "Guaranteed extension" patented technology

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 invention discloses a multi-cluster interlayer / in-fracture temporary plugging diversion fracturing process and a product preparation method, and particularly relates to the technical field of petroleum and natural gas exploitation, the fracturing process comprises the steps of dividing fracturing sections according to the physical property of a horizontal section reservoir of a coal-bed gas well, monitoring and automatically adjusting parameters during drifting, injecting prepad fluid to form a main fracture, and injecting sand adding fluid in a stepped mode. Preparing and injecting a temporary plugging material, injecting prepad fluid again to form a new crack, injecting sand-adding fluid into the new crack, replacing the sand-carrying fluid with clear water after fracturing, discharging the fluid and monitoring. The preparation method of the temporary plugging material comprises the steps of raw material mixing, extrusion granulation, drying, secondary extrusion granulation and the like, and the performance of the temporary plugging material is ensured through the measures of a specially designed screw structure, accurate control of temperature and humidity, addition of an auxiliary agent and the like. According to the method, the longitudinal crack coverage rate and the oil and gas recovery rate are increased, accurate control is achieved, the formation damage rate and the accident rate are reduced, it is ensured that the quality of the temporary plugging material is stable, and the formation permeability recovery rate is increased.

The present application relates to a kind of coal mine mining roadway type coal seam gas fracturing device, belong to coal mine gas extraction and fracturing technical field;Including pump truck body, main machine and high-pressure pump are fixedly arranged on pump truck body, the output end of high-pressure pump is provided with the first fracturing pipe and the second fracturing pipe of mutual docking, the outer side of the end of first fracturing pipe and second fracturing pipe away from each other is fixedly sleeved with packer, inner sleeve for shunting is inserted into first fracturing pipe, inner sleeve extends to the inside of second fracturing pipe, and disturbance mechanism is arranged on the outside of first fracturing pipe and second fracturing pipe;Top extension mechanism is arranged on pump truck body, and the chassis of pump truck body is lowered by top extension mechanism;Support mechanism is also arranged on pump truck body, and the support mechanism includes four telescopic arms, and the pump truck body is more stable by the unfolding of four telescopic arms;The problem that the existing roadway type fracturing device is poor in fracturing effect and lacks stability is solved.

The embodiment of the invention discloses a direction finding antenna, and relates to the technical field of radio monitoring direction finding, a PCB dielectric substrate is adopted to carry antenna units, the antenna is combined in an upper and lower layered mode through a step-shaped structure of the antenna, the miniaturization design of the antenna is achieved, the first antenna unit and the second antenna unit which are arranged on the upper and lower layers respectively cover different frequency bands, and the antenna performance is improved. The antenna unit is arranged on the PCB dielectric substrate to ensure the expansion of the working coverage frequency band of the antenna, the dielectric substrates are arranged in a crossed manner, the stability of the dielectric substrates is realized on the premise of ensuring the relative position relation of the antenna and the feed transmission lines, and the feed transmission lines corresponding to the antenna units are arranged on the PCB dielectric substrate to ensure the stability of the relative position relation of the antenna and the feed transmission lines. The influence of the antenna itself and the feed transmission line on the performance of other antennas can be reduced, so that the stability of the antenna performance is ensured, and the miniaturization design and the antenna performance of the direction-finding antenna are both considered.

A distributed intelligent optical fiber temperature sensing system of a cable bridge is characterized in that the bridge is provided with a bridge top, a bridge bottom, a bridge left side wall and a bridge right side wall, regular matrix type stacked cables fixed by clips are arranged in the bridge, a single optical fiber is planned according to a continuous path, and the temperature of the cable is measured through a mode of in-layer transverse column-by-column traversal of the matrix type stacked cables to interlayer longitudinal transition. Performing full-coverage temperature measurement on each cable in the stacked cables; the continuous path planning comprises repeated arrangement of a plurality of basic winding units, and each basic winding unit comprises a plurality of cable detection sections, interlayer crossing sections and calibration sections. According to the scheme, through the optical fiber length corresponding to the abnormal temperature, the database can be quickly and reversely checked to determine the cable layer and column number to which the abnormal point belongs, the purposes that one optical fiber covers the whole matrix and one hot spot is accurately positioned to a single cable are achieved, and the space positioning problem of stacked cable temperature measurement is solved.

The invention relates to a device (1) for introducing an intravascular implant (3) into a blood vessel, the implant (3) having an at least partially cylindrical design, wherein the implant (3) is provided in an expanded state, in which the implant is placed in the blood vessel, and in a compressed state, in which the implant can be introduced into the blood vessel, and the device (1) has an elongated shaft (2), the outer side of which is releasably fixed to the implant (3) in the compressed state, and through which the implant (3) is advanced. The implant (3) has at least one corresponding connection point (6) to the shaft (2) on the proximal and distal sides, and the connection point is heat-releasable, chemically releasable, or electrolytically releasable; or at least one wire (12) extends in the longitudinal direction on the implant (3), at least over most of the length of the implant (3), so that the implant (3) is fixed to the shaft (2) in a compressed state, and the wire (12) has at least one corresponding connection point (10, 11) to the shaft (2) on the proximal and distal sides, and at least one connection point (11) of the connection point is heat-releasable, chemically releasable, or electrolytically releasable.

The invention relates to a digital multi-beam forming chip. The digital multi-beam forming chip comprises a receiving multi-beam forming link, a transmitting multi-beam forming link, a daisy chain SerDes high-speed interface and a frequency synthesizer; the receiving multi-beam synthesis link is used for realizing receiving multi-beam synthesis; the transmitting multi-beam forming link is used for realizing transmitting multi-beam forming, and the daisy chain SerDes high-speed interface comprises a beam forming data daisy chain SerDes high-speed interface and a control data daisy chain SerDes high-speed interface; the digital multi-beam forming chip is in serial expansion connection through a daisy chain SerDes interface to realize large-scale array formation; the frequency synthesizer provides a synchronous sampling clock between the digital multi-beam forming chips. By adopting the digital multi-beam synthesis chip, a universal core basic component support can be provided for engineering implementation of large-scale digital phased array multi-beam synthesis.

This utility model discloses a core extraction structure for a multi-cavity mold, including a core fixing guide block, a hydraulic cylinder mechanism, and a hydraulic cylinder connecting block, all fixedly connected to the core. One end of the hydraulic cylinder connecting block is a T-shaped insertion block, and the other end is a C-shaped limiting groove. The T-shaped insertion block is positioned within a groove between the core fixing guide blocks. The end of the hydraulic cylinder rod of the hydraulic cylinder mechanism is vertically embedded in the C-shaped limiting groove, thereby connecting the hydraulic cylinder mechanism to the core fixing guide block. This utility model, by incorporating the hydraulic cylinder connecting block, facilitates the disassembly and installation of the hydraulic cylinder, improving production efficiency. Furthermore, the connecting block can connect hydraulic cylinder rods of different diameters, broadening its applicability.

The utility model relates to a window cleaning robot related technical field, especially a new window cleaning robot's adsorption cleaning mechanism, including fills the shell body, the side of shell body is equipped with drive wheel, the inside connection of shell body has the inner shell, the surface of shell body is provided with adsorption mechanism, the bottom of inner shell is provided with cleaning mechanism. This new window cleaning robot's adsorption cleaning mechanism, by separating the setting of adsorption mechanism and cleaning mechanism, avoid the interference of cleaning wheel rotation to the air flow of air inlet hole, ensure that the negative pressure produced by centrifugal fan is stable and undulation, the adsorption force always keeps constant, the cleaning mechanism is independent of adsorption frame operation, the eccentric circumferential motion of four groups of second cleaning brush and the central rotation of first cleaning brush do not influence each other, guarantee the cleaning coverage expansion times above, and also eliminate the adsorption force attenuation caused by cleaning action, realize the synchronous promotion of adsorption stability and cleaning efficiency.

The double-broadband substrate integrated waveguide back cavity slot antenna comprises a circular dielectric substrate, and the upper layer and the lower layer of the dielectric substrate are covered with a first metal layer and a second metal layer respectively; the outer ring of the antenna unit is provided with a plurality of metalized through holes, so that the antenna unit forms a substrate integrated waveguide structure; the center of the first metal layer and the center of the second metal layer are respectively provided with a feed hole, and a feed probe penetrates through the feed hole. A plurality of metalized short-circuit through holes are formed in the circumference of the first metal layer by taking the feed hole as a circle center; the first metal layer is provided with a plurality of gaps in different shapes, and the metalized short-circuit through holes are located among the gaps. According to the invention, the bandwidth of the antenna is obviously improved by fusing a plurality of resonant modes of the substrate integrated waveguide, and the antenna gain can be improved while the broadband performance is obtained by optimally designing the structure of the radiation slot of the substrate integrated waveguide back cavity slot antenna.

The invention relates to a plasma control method for laser-induced silicon carbide wafer crack propagation, which comprises the following steps of: performing laser focusing on a to-be-processed position of a silicon carbide crystal ingot, and generating high-excitation-state plasma in the crystal ingot; after the plasma is generated, an external magnetic field or electric field is applied to regulate and control the motion state of the plasma, so that the crack expands along a preset path and depth; characteristic parameters of the plasma are monitored in real time, data are transmitted to a feedback control system, and laser parameters and magnetic field or electric field intensity are dynamically adjusted according to the motion state of the plasma; and repeatedly scanning and expanding the crack growth range to realize the stripping of the wafer. According to the plasma control method for laser-induced crack propagation of the silicon carbide wafer, the propagation path and depth of the crack can be effectively controlled, disordered propagation of the crack is avoided, material damage in the processing process of the silicon carbide wafer is greatly reduced, the silicon carbide wafer can be efficiently stripped, the processing speed is increased, and the quality of a final product is improved.

The invention discloses a nano wall (NWaFET) IC structure of a novel cascade transistor, and relates to the field of microelectronic technology and integrated circuits (IC). The transistor cascade structure model comprises two or more longitudinal MOS structures, a plurality of transistors are arranged in a U shape, and series connection, parallel connection and cascade gain stage of the plurality of nanometer wall structure transistors are realized by flexibly changing the source region, the drain region and the grid connection mode of the MOS transistors. According to the transistor cascade structure, the integration level of the transistor cascade structure can be improved, and flexible conversion of cascade modes can be achieved.