47results about How to "Improve rock breaking efficiency" patented technology

The invention discloses a hard rock cutting pick with a double-clamp-spring structure, and belongs to the technical field of cutting picks. A hard rock cutting pick with a double-clamp-spring structure comprises a cutting pick body, the cutting pick body comprises a pick handle and a pick head which are detachably connected, a protruding block protruding outwards is formed on the bottom wall, corresponding to the pick handle, of the pick head, and a plurality of inserting parts extending outwards are formed on the outer wall of the protruding block at equal intervals; a butt joint groove matched with the bottom wall of the tooth head is formed in the top wall of the tooth handle, inserting grooves which are concave inwards and matched with the protruding block and the inserting parts are formed in the bottom wall of the butt joint groove, and the protruding block is used for being matched with the inserting parts to limit the tooth head in the circumferential direction. The cutting pick is provided with the pick handle and the pick head which are detachably connected, when the pick head needs to be replaced due to abrasion or damage, only the pick head part needs to be replaced, the whole cutting pick does not need to be replaced, material waste is reduced, and the production cost and the maintenance cost are reduced.

The present invention discloses a high-pressure water jet edge cutter. It comprises an edge cutter mechanical structure, an edge cutter high-pressure water jet pipeline and an edge cutter high-pressure water jet nozzle; the edge cutter high-pressure water jet pipeline is located inside the edge cutter mechanical structure; the edge cutter high-pressure water jet nozzle is embedded inside the edge cutter mechanical structure and is connected to the edge cutter high-pressure water jet pipeline. The present invention has the advantages of spraying high-pressure water to fracture rocks and can solve the problem of TBM jamming. The present invention also discloses a hydraulic-mechanical combined rock-breaking and TBM cutter disc. The present invention also discloses a hydraulic-mechanical combined rock-breaking and escape method.

The invention belongs to the technical field of high-pressure water jet rock breaking and well drilling, and particularly relates to a double-self-oscillation pulse porous water jet nozzle which comprises a water jet input section, a water jet output section and a water jet output section. The self-excited oscillation cavity section is detachably connected with the water jet input section, a first self-excited oscillation part is arranged at one end of the self-excited oscillation cavity section and used for conducting first-time self-excited oscillation on high-pressure water, and a second self-excited oscillation part is arranged at the other end of the self-excited oscillation cavity section and used for conducting second-time self-excited oscillation on high-pressure water; the second self-excited oscillation part is used for carrying out second self-excited oscillation on the high-pressure water subjected to the first self-excited oscillation; the water jet output section is detachably connected with the self-excited oscillation cavity section, a third self-excited oscillation part is arranged at one end of the water jet output section, the third self-excited oscillation part and the second self-excited oscillation part jointly carry out second-time self-excited oscillation on the high-pressure water, and a porous jet part is arranged at the other end of the water jet output section and communicates with the third self-excited oscillation part.

The invention discloses a water jet rock free surface cutting test device under a submerged jet environment, and relates to the field of geotechnical engineering detection.The water jet rock free surface cutting test device comprises a closed experiment bin, a high-pressure water jet system, a pressure servo system and a water pressure sensing device; liquid pressure around a to-be-tested rock block in the closed experiment bin is adjusted through the pressure servo system so as to simulate a submerged jet environment in the actual rock breaking process, the high-pressure water jet system can generate a high-pressure water jet cutter to cut the to-be-tested rock block, and in the process of a water jet rock free surface cutting test in the submerged jet environment, the rock free surface is cut by the high-pressure water jet cutter. By adjusting the moving speed of the water jet nozzle in the high-pressure water jet system, the nozzle moving speed matched with the required grooving depth is obtained, and therefore the problem that the rock breaking and well drilling efficiency is low is solved.

The invention discloses a natural vibration pulse abrasive jet assisted TBM rock breaking device and method, and relates to the technical field of tunnel excavation and tunneling construction mechanical equipment, and the device comprises a multi-mode natural vibration pulse abrasive jet assisted TBM rock breaking cutterhead, an abrasive jet generation system, an extremely hard rock abrasive machining system and a rebound apparatus. According to the multi-mode natural vibration pulse abrasive jet assisted TBM rock breaking cutterhead, natural vibration pulse abrasive jet is adopted to assist the TBM in rock breaking, efficient rock breaking of the TBM in a high-strength and high-abrasiveness stratum is achieved, abrasion of a cutter is reduced, energy consumption of a machine is reduced, the consistency of the overall rock breaking efficiency of the TBM cutterhead can be guaranteed, and the service life of the TBM cutterhead is prolonged. The problems of high local rock breaking efficiency and low edge rock breaking efficiency of a cutterhead are avoided, an extremely-hard rock abrasive machining system is designed in the TBM, extremely-hard rock residues can be recycled and machined into extremely-hard rock abrasives for jet rock breaking, use of industrial abrasives is reduced, and therefore the engineering tunneling cost is reduced.

The invention relates to a blasting structure and a blasting method for a steep rock slope, the steep rock slope comprises a step to be blasted and a structural surface rock mass, and the step and the structural surface rock mass are integrally connected; the blasting structure comprises a pre-splitting blasting area and a main blasting area, and the pre-splitting blasting area and the main blasting area are sequentially distributed in the horizontal direction in the direction away from the structural face rock mass. The pre-splitting blasting area comprises at least two rows of pre-splitting holes which are sequentially distributed in the direction away from the structural surface rock mass in the horizontal direction, and the first row of pre-splitting holes are formed in the designed excavation contour line of the structural surface rock mass when viewed from the direction away from the structural surface rock mass in the horizontal direction; the main blasting area comprises at least two rows of main blasting holes which are sequentially distributed in the horizontal direction in the direction away from the structural face rock mass. And each row of pre-splitting holes and each row of main blasting holes are arranged in parallel. The overall blasting efficiency is high, the forming quality of the excavated contour surface is high, and the blasting requirement of the ultrahigh steep slope can be well met.

A bionic rock-invading agent for silicate rock crushing and an auxiliary rock-breaking method thereof are provided, wherein an oxalic acid-sodium oxalate buffer solution OA is prepared, which comprises, by weight percentage, 0.6% to 1.1% of oxalic acid and 1.2% to 5.5% of sodium oxalate; a bionic neutral rock-invading agent ON is prepared, and the following four components, by weight percentage, are added to OA in a certain weight ratio: 0.05% to 0.3% of polyacrylamide, 1.0% to 3.1% of triethanolamine, and 0.3% to 5.5% of citric acid. 1.5%, trisodium nitrilotriacetic acid 2.0% to 5.0%, wherein the purity of polyacrylamide is ≥ 99.5%; the purity of triethanolamine is ≥ 99.5%; the purity of citric acid is ≥ 99.5%; the purity of trisodium nitrilotriacetic acid is ≥ 99.5%; during TBM excavation or oil drilling, the configured bionic rock-invading reagent is sprayed from the TBM cutter head to the face or pumped into the hollow of the drill string; thereby degrading the mechanical properties of the rock and achieving mechanical-chemical coupling rock breaking. The bionic rock-invading reagent of the present invention is neutral, has no obvious corrosiveness to mechanical rock-breaking tools, is environmentally friendly and efficient, and is particularly suitable for chemically assisted rock breaking of hard rocks such as silicate rocks.

The utility model discloses a core auxiliary blade telescopic PDC (polycrystalline diamond compact) drill bit which comprises a drill bit base body, a containing cavity is formed in the center of the top of the drill bit base body, a high-strength alloy spring is arranged in the containing cavity, and a center blade is inserted into the containing cavity and arranged above the high-strength alloy spring. And a plurality of core conical teeth are uniformly distributed at the top of the central cutter wing at intervals. When the drill bit breaks rocks, the peripheral cutting teeth cut and destroy rocks on the outer ring of the shaft bottom, the center rocks at the center of the shaft bottom push the center blades into the containing cavities to form rock bosses, the hardness of the center rocks is reduced, the springs stop moving after being compressed to a certain degree, the core conical teeth plough and break the rocks, and the higher the hardness of the rocks is, the higher the formed rock bosses are; based on the drill bit, self-adaption and stable drilling speed can be achieved when the drill bit is used for drilling soft and hard stratums, and high drilling speed can be achieved when the drill bit is used for drilling hard stratums.

The invention discloses a diamond compact and a PDC drill bit, and relates to the technical field of drill bits, the diamond compact comprises a drill bit body, six groups of connecting plates are arranged on the circumferential outer wall of the drill bit body, a mounting groove is formed in one side of each connecting plate, and a compact body is fixed to the inner diameter of the mounting groove; the specification of the composite sheet body is gradually reduced in the direction away from the bottom end of the drill bit body, a flow guide channel is defined by the two sets of connecting plates, a butt joint base is fixedly connected to the top of the drill bit body, the cross section of the butt joint base is in an isosceles trapezoid shape, a threaded groove is formed in the circumferential outer wall of the butt joint base, and six sets of liquid drainage holes are formed in the bottom of the drill bit body. According to the drill bit, a liquid drainage hole in the end of the drill bit body can be effectively prevented from being blocked, it is guaranteed that cooling liquid can be continuously sprayed out to cool and wash the drill bit body and the composite sheet body, and the service life of the drill bit is prolonged.

The present invention provides a tunnel boring machine equipped with a high-pressure water jet cutting system and a combined excavation method, including a tunnel boring machine body, a flow pump group is arranged on the tunnel boring machine body, and a high-pressure water jet cutting system is arranged at the front end of the tunnel boring machine; the high-pressure water jet cutting system includes a water jet-mechanical combined cutter disc, a water jet-shell knife combined tool, a high-pressure water transmission pipeline, a multi-media rotation center and a water jet diverter valve block, wherein one end of the high-pressure water transmission pipeline is connected to the flow pump group, and the other end is connected to the multi-media rotation center, and the multi-media rotation center is connected to the water jet diverter valve block, and the high-pressure water is divided into multiple paths, which are respectively supplied to each water jet-shell knife combined tool on the water jet-mechanical combined cutter disc. The present invention provides practical suggestions and references for the overall design, optimization and spatial layout of the high-pressure water jet system.

The present application provides a kind of formation threshold WOB and threshold torque determination method and device, belong to drilling engineering technical field, the method includes: obtaining different preset top drive speed under, in the preset WOB interval, the mechanical drilling speed, torque value and drill bit vibration parameters corresponding to different WOB value;For each preset top drive speed: based on the WOB value of the preset top drive speed and the mechanical drilling speed corresponding to the WOB value, determine the initial threshold WOB of the preset top drive speed from the WOB value;Based on the initial threshold WOB of the preset top drive speed, the torque value corresponding to the preset top drive speed is determined as the initial threshold torque of the preset top drive speed;Based on the drill bit vibration parameters corresponding to initial threshold WOB, initial threshold WOB and initial threshold torque are corrected, and formation threshold WOB and formation threshold torque are obtained.The present application has the advantages of simple calculation method, more accurate result, can effectively guide the selection of drill bit and screw rod, improve the mechanical drilling speed, and improve the rock breaking efficiency.

The present invention relates to a sharp-ridge cutting tooth, comprising a tooth column and a tooth crown arranged at the upper end of the tooth column, characterized in that the tooth crown is formed by at least three transition surfaces intersecting obliquely upward and forward, presenting an approximate pyramidal shape, forming at least three upwardly protruding edges or ridges, the upper ends of the edges or ridges intersecting at the top of the tooth crown, and the lower ends to the outer peripheral edge of the tooth crown, two deflected wedge surfaces are correspondingly arranged on both sides of at least one edge or ridge on the edge of the tooth crown, the two deflected wedge surfaces intersect with the two transition surfaces to form two side edges, the front ends of the two side edges intersect at both sides of the lower edge of the edge or ridge to form a sharp-ridge cutting edge. The present invention sets a multi-edge sharp-ridge cutting edge, the sharp ridge part can effectively wedge into the formation, effectively release the formation stress, and improve the rock breaking efficiency; the sharp ridge part to the tooth top plane can effectively disperse the stress borne by the cutting tooth when breaking the rock, and improve the impact resistance of the cutting tooth; the present invention can improve the anti-abrasion ability of the drill bit and extend the service life of the drill bit.

The application discloses a PDC drill bit suitable for continuous and rapid drilling of a limestone stratum and application thereof. The drill bit comprises a drill bit body, the drill bit body is provided with a blade wing, and the blade wing is provided with cutting teeth arranged in double lines. The double lines comprise a main line and a secondary line, the main line and the secondary line are located on the same crown line, the main line is located on an infeed contact surface of the blade wing, and the secondary line is located behind the main line. The cutting teeth comprise plane teeth and flow-passing special-shaped cutting teeth, the main line is provided with main line plane teeth, and the secondary line is provided with flow-passing special-shaped cutting teeth. The flow-passing special-shaped cutting teeth are provided with a through tooth flow passage, and the blade wing is provided with a blade wing flow passage corresponding to the tooth flow passage. The application adopts the same crown line double line tooth arrangement, greatly reduces the impact force on the cutting teeth, and avoids early damage of the cutting teeth. The application is provided with the tooth flow passage and the blade wing flow passage, improves the cooling effect of the cutting teeth, avoids thermal damage of the cutting teeth, prolongs the service life of the cutting teeth, and ensures that the drill bit has continuous aggressiveness.

The invention discloses a large-diameter drilling device and method based on hydraulic combined rock breaking, and relates to the technical field of cast-in-place pile construction.The drilling device comprises a combined rack, a driving assembly, a drilling pipe and a controller, the driving assembly is arranged on the combined rack, the drilling pipe is arranged on the driving assembly and rotationally connected with the driving assembly, a cutter head is arranged at the bottom end of the drilling pipe, and the controller is connected with the cutter head; a plurality of water jet cutters and a plurality of hobbing cutters are arranged on the cutter head in the circumferential direction at intervals, and the controller is used for controlling the driving assembly to drive the drilling pipe to rotate so as to drive the water jet cutters and the hobbing cutters to cut rocks. According to the large-diameter drilling device based on hydraulic combined rock breaking, the driving assembly drives the drilling pipe to rotate, then the multiple water cutters are driven to cut rocks, the multiple hobs are driven to crush the cut rocks, the water cutters and the hobs are matched to achieve hydraulic combined rock breaking, the difficulty of separately using the hobs to crush hard rocks is reduced, the cutters are protected, and the service life of the hobs is prolonged. The loss of instruments is reduced, the rock breaking efficiency is improved, and the construction cost is reduced.

The invention discloses a directional drilling hole-forming device, and relates to the technical field of drilling tools, the directional drilling hole-forming device mainly comprises a drill bit, a rock breaking head and an elastic piece, the drill bit is connected with a driving device through a connecting piece for drilling, the rock breaking head is slidably arranged in the drill bit and can extend out of the drill bit, and the elastic piece is arranged at the side part of the rock breaking head; one end of the elastic piece is fixedly connected with the side part of the rock breaking head, and the other end is fixedly connected to the inner wall of one end of the drill far away from the driving device. The device can adapt to stratums with different hardness.

The present invention provides a near-drill bit axial punching vibrator, which relates to drilling machinery and tools, including an upper joint, an outer cylinder, a hammer, an anvil, and a spline sleeve, wherein the outer cylinder is connected to the upper joint, the anvil is located in the hammer, and a spring is arranged between the hammer and the upper joint. The hammer is subjected to the impact force and elastic force of the liquid, reciprocates in the axial direction, and intermittently impacts the anvil to achieve drilling. The present invention has a simple structure, a valve-free structure, is generally strong and reliable, and has a long service life. Moreover, when the fluid pressure in the fluid pressure working chamber is relatively large, the impactor is in an impact interval. At this time, the anvil can still provide instantaneous pressure pulses for the drill bit under the action of the high-pressure fluid, and the effective force time on the drill bit is increased, thereby further improving the rock crushing efficiency and being more conducive to unblocking than conventional impactors.

The application discloses a method for evaluating the improvement of the high-frequency axial vibration kinetic energy of a drill bit by a rotary percussion tool, and is based on measured wellbore trajectory parameters, drill string structure parameters and rotary percussion tool characteristic parameters, considers different rotary percussion tool installation positions, utilizes a drill string dynamics analysis method to obtain a drill string axial vibration speed, calculates a drill bit high-frequency axial vibration kinetic energy index, and uses the index as an evaluation basis for the improvement degree of the drill bit kinetic energy, and determines a reasonable rotary percussion tool installation position and a working frequency based on the index.

The utility model relates to the technical field of drill bits, in particular to an ultra-large-diameter, ultra-large-flow and ultra-high-power screw drill for an ultra-large borehole, which comprises a replacement and protection integrated assembly, an ultra-large-outer-diameter motor assembly, a universal shaft assembly and a transmission shaft assembly which are connected in sequence, the replacing and preventing integrated assembly comprises a replacing and preventing integrated connector, a hollow anti-falling nut, an alloy water nozzle, a pressing ring, an anti-falling gasket and a hollow anti-falling rod, the replacing and preventing integrated connector is used for being connected with other tools, the anti-falling gasket is fixed to the hollow anti-falling rod through the hollow anti-falling nut, and the needed alloy water nozzle is fixed into the hollow anti-falling nut through the pressing ring. And the anti-falling gasket is meshed and fixed with the hollow anti-falling rod in a single flat manner. According to the device, a simple mechanical structure is adopted, so that the screw drill has larger displacement and higher output power; and the ultra-large outer diameter has higher safety and high rock breaking efficiency when being used for drilling in a well hole with the diameter of more than 20 ''.

This invention relates to the field of coal mining technology, specifically to a method for large-area gas control. The method comprises the following steps: delineating the boundary of the large-area gas control zone; using a TBM (Tube Milling Machine) to excavate a boundary roadway starting from the center of the boundary of the large-area gas control zone; excavating a connecting roadway within the area enclosed by the boundary roadway; drilling a through borehole within the coal seam area enclosed by the connecting roadway and the boundary roadway; and using fracturing and extraction technology to extract gas within the through borehole. Utilizing the rapid roadway construction advantage of the TBM, long-distance, high-efficiency rock breaking operations can be achieved, improving the mechanization and intelligence level of the working face. Following drilling and gas extraction, compared to traditional mechanized mining and blasting, this method significantly reduces disturbance to the surrounding rock, lowers the probability of coal and gas outbursts, effectively improves gas control efficiency, and enables safe and efficient mining of deep coal resources, effectively solving the corresponding technical problems existing in the prior art.

The invention provides a double-power-head mounting structure, a drilling machine and a control method, and the mounting structure comprises a mast assembly which comprises two outer masts and an inner mast which is slidably arranged between the two outer masts; the two track plates are detachably connected with the front surfaces of the corresponding outer masts respectively; the outer lifting oil cylinder is used for driving the outer power head to move up and down; the outer power head is slidably connected with the track plate through a sliding frame; the telescopic ends of the outer lifting oil cylinders penetrate through the corresponding sliding frames from top to bottom, cylinder barrels of the outer lifting oil cylinders are connected with the end faces, close to the mast operation platform, of the sliding frames, and the telescopic ends of the outer lifting oil cylinders are connected with the mast operation platform through supports. The two inner lifting oil cylinders are arranged in the corresponding outer masts respectively, and the two telescopic ends of the inner lifting oil cylinders are connected with the top ends of the inner masts through mast connecting pieces; the inner power head is slidably arranged on the front surface of the inner mast; the outer power head and the inner power head are coaxially arranged up and down; the double power heads can share the same well mouth, and double power head casing-following drilling can be achieved.

The invention belongs to the technical field of blasting, and particularly relates to a graded blasting device based on gas blasting, which comprises a metal outer sleeve, and an exhaust part is arranged on the metal outer sleeve; the outer fracturing pipe is coaxially arranged in the metal outer sleeve, the outer fracturing pipe is detonated in advance through a second detonating part, and the outer fracturing pipe is filled with a first explosive; the inner fracturing pipe is coaxially arranged in the outer fracturing pipe, the inner fracturing pipe is delayed and detonated through the first detonating part, and the inner fracturing pipe is filled with a second explosive; and a vacuum layer is arranged between the outer fracturing pipe and the inner fracturing pipe. The invention further comprises a blasting method using the device. The first explosive in the outer fracturing pipe is detonated in the detonating process, then the second explosive in the inner fracturing pipe is detonated in a delayed mode in a short time, the rock breaking effect is achieved through detonating of the outer fracturing pipe, the inner fracturing pipe is detonated again to enable rock cracks to expand to be larger and deeper, and the rock breaking efficiency is improved.

The invention discloses a high-pressure water jet numerical control efficient joint cutting assisted TBM hob rock breaking test system and a test method, and relates to the technical field of tunnel engineering tests. In order to solve the problem that the existing rock breaking test cannot accurately reflect the real mechanical response and rock breaking mechanism of repeated cutting of a hob and a high-pressure water jet nozzle on a TBM cutterhead on an excavation surface, the following technical scheme is provided: the TBM cutterhead rock breaking test device comprises a strip-shaped transportation platform, a rock box system, a supporting upright post and a fixed back plate, and a cutterhead cutter system is arranged on the back plate; the cutterhead cutter system performs rotary cutting on the rock sample, and the cutterhead cutter system performs lifting motion through a cutterhead propelling system arranged at the top; the rock box system can transversely move along the strip-shaped conveying platform, and the three-axis numerical control cutting guiding system conducts water jet cutting on a rock sample. According to the test system and the test method provided by the invention, a more accurate and efficient test means can be provided for TBM hob rock breaking, and important technical support is provided for design and construction of tunnel engineering.

The invention provides a rock breaking method for self-adaptive regulation and control of an electrode form under the action of high-voltage electric pulses, and relates to the technical field of high-voltage rock breaking. The method comprises the following steps: firstly, acquiring multi-feature parameters, constructing a comprehensive evaluation parameter set and a target working condition reference evaluation parameter set, and calculating a working condition deviation index; and then geometric shape parameters including the curvature radius, the blunt degree, the chamfer size, the asymmetry degree and the surface roughness of the end of the high-voltage electrode are introduced, a linear correlation model of the electrode shape and the rock breaking effect is established, and prediction of the rock breaking effect is achieved. And on the basis of the working condition deviation index and the correlation model output result, form sensitivity and form regulation and control criteria are obtained, an electrode form regulation and control instruction set is generated, machining, polishing or replacement is conducted on the end of the electrode, and quantitative optimization and closed-loop regulation and control of the high-voltage electric pulse rock breaking effect are achieved. The problems that in the high-voltage electric pulse rock breaking process in the prior art, data utilization is dispersed, and intelligent regulation and control of the electrode form cannot be supported are solved.

The invention provides a foaming agent and an active hob lubricating method and a performance testing method thereof, the foaming agent comprises an original solution, and the foaming agent is characterized in that basic components of the original solution comprise a foaming agent, a foam stabilizer, a thickening agent and a solvent; for the medium-hardness rock stratum, the original solution further comprises an acidifying agent; aiming at the existence of a rock stratum rich hard water medium, the original solution component further comprises a chelating agent; aiming at serious friction of the hob on the interface of the cutter and the rock, the original solution also comprises a lubricant. The method for actively lubricating the hobbing cutter is characterized in that the foaming agent is sprayed to a tunnel face through a spraying opening formed in a cutter head. The performance testing method suitable for the foaming agent is characterized by comprising basic performance testing of an original solution, stability testing of the original solution and mass difference measurement of a cutter ring sample in the process of a cutter rock abrasion test. The friction wear life of the cutter ring can be prolonged by reducing the abrasiveness of dense nuclear substances.

The invention discloses a drill bit with dual functions of cutting and grinding and application, and relates to the technical field of rock breaking in oil drilling, and the drill bit is characterized in that a plurality of drill bit blades are arranged on a drill bit cylinder; a plurality of rows of rock breaking elements are arranged on each drill bit blade, and each row of rock breaking elements is composed of a plurality of PDC compacts or a plurality of diamond-impregnated compacts; the height of the PDC compact on the drill bit blade is larger than the height of the impregnated diamond compact on the drill bit blade. Through the synergistic effect of cutting rock breaking of the PDC compact and grinding rock breaking of the impregnated diamond compact, after the PDC compact is abraded, diamond particles exposed out of the impregnated diamond compact grind the stratum, weaken the rock strength and assist the PDC compact to continuously penetrate into the rock, so that the rock breaking efficiency of the drill bit is improved, the service life of the drill bit is prolonged, and the drill bit is suitable for large-scale popularization and application. And the purposes of reducing the tripping times, reducing the drilling cycle and reducing the drilling cost are achieved.

The utility model provides a novel tooth-shaped shield tunneling machine hob cutter ring which comprises a base body and a friction ring, the friction ring is arranged on the outer circle of the base body in a sleeved mode, the thickness of the friction ring is smaller than that of the base body, and a plurality of grooves are distributed in the peripheral face of the friction ring in the circumferential direction of the friction ring. The method has the characteristic of improving the rock breaking efficiency of the hob of the shield tunneling machine in a low-strength rock stratum.

The hydraulic rock mass presplitting method for improving the rock breaking efficiency of the roadheader comprises the steps that S1, the initial position of a fracturing hole in a hard rock roadway is determined, and stress distribution and related physical and mechanical parameters of any point around the fracturing hole are actually measured on site; s2, crack initiation pressure is obtained through calculation, and the type and performance parameters of equipment are selected; calculating to obtain a theoretical fracturing radius R1; s3, observation holes are formed in the periphery of the fracturing hole, the actual expansion radius of the hydraulic fracturing fracture of the hard rock roadway is analyzed, and the minimum value is taken; s4, the sufficient hydraulic fracturing area is calculated, and the number of drill holes, the distance between the drill holes and the arrangement scheme of observation holes are determined; s5, the depth of a fracturing hole and the position of a hydraulic fracturing initiation point in the drill hole are determined; s6, carrying out fracturing treatment by adopting a retreating type high-pressure water injection fracturing technology; by drilling the observation hole and the fracturing hole and selecting equipment with performance parameters matched with actual working condition requirements, the cutting performance of the hard rock mass is effectively improved, the rock breaking efficiency of the roadheader is improved, and the cutting pick loss is reduced.

The present application belongs to the technical field of tunneling device, and provides a tunable frequency self-vibration pulse cavitation jet nozzle and combined rock breaking tunneling equipment thereof. The tunable frequency self-vibration pulse cavitation jet nozzle comprises an upper nozzle and a lower nozzle, a plurality of first connecting pieces are arranged on the outer circumferential surface of the upper nozzle, a plurality of second connecting pieces are arranged on the lower nozzle, and the first connecting pieces are connected with the second connecting pieces to form a self-vibration cavity between the upper nozzle and the lower nozzle. The axial cavity length of the self-vibration cavity is determined by adjusting the distance between the first connecting pieces and the second connecting pieces. The lower nozzle adopts a contraction-expansion type cavitation nozzle. The self-vibration pulse cavitation jet nozzle is adjustable, the jet frequency is changed by adjusting the axial cavity length of the nozzle, so that the equipment has a wider frequency selection range when facing different rock bodies, and can adapt to the frequency optimization problem of the TBM under different rotating speeds.

The invention discloses a safe low-energy-consumption liquid oxygen pressurization output system, and belongs to the technical field of mineral resource exploitation. The system comprises a vertical Dewar tank, a liquid pressurization system, a horizontal Dewar tank, a liquid-gas separation device and a shunting pipeline system, the vertical Dewar tank is connected with an inlet of the horizontal Dewar tank through the liquid pressurization system, and an outlet of the horizontal Dewar tank is connected with the shunting pipeline system through the liquid-gas separation device. And a preset flow valve group is mounted on a shunting pipeline of the shunting pipeline system. The invention aims to solve the problems of improving the liquid oxygen conveying efficiency and safety, reducing the gasification loss, reducing the energy consumption and improving the rock breaking accuracy in the prior art, improve the liquid oxygen conveying safety, ensure the liquid oxygen rock cracking effect and reduce the rock cracking cost.