13results about How to "Improve rock breaking efficiency" patented technology

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 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 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.

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 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 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 utility model provides a cutterhead and a heading machine. The cutterhead comprises a cutterhead body, a pipeline system and a plurality of cutter assemblies, the cutterhead body comprises a spherical panel, and the pipeline system is arranged on the cutterhead body and is configured to convey an external water source to the cutterhead body and the panel; the cutter assemblies are arranged on the panel and distributed at intervals along the spherical track of the panel, each cutter assembly at least comprises a hob, and the axes of all the hobs are perpendicular to the spherical tangent line of the panel to form spherical arrangement. The device is suitable for a full-face heading machine method and a cantilever type heading machine method, the application range is wide, meanwhile, the number of rock broken by the hob during equipment heading is increased, and the rock breaking efficiency is improved.

The invention provides a hard alloy ball tooth of a gradient structure suitable for dry rock breaking and a preparation method, the hard alloy ball tooth is of an N-layer gradient structure, and raw materials of the gradient structure comprise WC powder, Co powder and graphene powder; in the N-layer gradient structure, the volume fraction of the WC powder and the volume fraction of the graphene powder are equal or increased layer by layer from the inner layer to the outer layer, and the volume fraction of the Co powder is equal or decreased layer by layer from the inner layer to the outer layer; in the outermost layer of the N-layer gradient structure, the volume fraction of the WC powder and the volume fraction of the graphene powder are both larger than the volume fraction of the Co powder; and the thickness of each layer in the N layers of gradient structures is greater than or equal to 0.1 mm. According to the hard alloy ball tooth, the mechanical property of the hard alloy ball tooth is improved, the hard alloy ball tooth has high hardness and high toughness, the hard alloy ball tooth is endowed with more excellent heat dissipation performance, the rock breaking efficiency is improved to a great extent, and the service life of a product is prolonged to a great extent.

This utility model belongs to the field of tunnel rock breaking equipment, specifically providing a rock breaking device and a cantilever tunneling machine. The rock breaking device includes a vibrating shell, inside which a rotatable main shaft is installed. The main shaft is equipped with a main drive mechanism to drive its rotation. A rock breaking head that rotates with the main shaft is connected to the front end of the main shaft. The central axis of the rock breaking head is eccentric to the rotation axis of the main shaft. The main shaft is hollow, and an eccentric block that rotates relative to the main shaft is installed inside the main shaft. The eccentric block is equipped with an eccentric drive mechanism to drive its rotation, thereby generating radial vibration. The cantilever tunneling machine includes the aforementioned rock breaking device. During construction, this utility model can achieve two combined working modes: eccentric rotation of the rock breaking head and radial vibration of the rock breaking head, achieving a "1+1>2" effect, improving the rock breaking ability of the device for extremely hard rock formations, and thus increasing rock breaking efficiency.

This invention relates to a cutterhead optimization system suitable for full-face tunneling machines, belonging to the field of cutterhead optimization control technology. The system includes: a data acquisition module for collecting various cutterhead operating parameter data within a preset time period and obtaining historical cutterhead wear data; a tunneling characteristic analysis module for analyzing tunneling characteristic information at the current moment; a wear prediction module for predicting the wear coefficient of the cutterhead at the current moment based on historical wear data and various cutterhead operating parameter data within the preset time period; a parameter generation module for generating the optimal working parameters of the cutterhead at the current moment based on the wear coefficient and tunneling characteristic information; and a control module for controlling the working parameters of the full-face rock tunneling machine to achieve the optimal working parameters of the cutterhead at the current moment. This invention achieves precise control of the cutterhead's working parameters, which can improve the cutterhead's working efficiency, reduce cutterhead wear, and extend its service life.

The utility model discloses a kind of polycrystalline diamond composite cutting teeth and high-efficiency high bearing drill, cutting tooth includes hard alloy base body and polycrystalline diamond layer, hard alloy base body is connected by the arc surface portion of two ends and the straight surface portion between two arc surface portion and is made into capsule-shaped column structure;The end face of polycrystalline diamond layer away from alloy base body is working surface, working surface is plane or is equipped with at least one convex portion;Convex portion includes upper end portion and the transition surface between it and arc surface portion and / or straight surface portion;The layout of cutting tooth is optimized by straight edge design in the application, innovative "capsule-shaped" composite cutting tooth design is introduced, and the failure problem of high bearing drill in restricted space is systematically solved under the tooth distribution bottleneck and hard rock working condition. Cutting tooth of straight edge design can realize higher tooth distribution density, so that drill can effectively distribute load in narrow space, thereby significantly improve the cutting performance of key area, improve overall drilling efficiency.

The application belongs to the technical field of space resource development and rock breaking, and provides a contact type laser-assisted rock breaking drilling tool for lunar base extreme environment, which comprises a drill bit, a drill rod, a base, a laser emitter and a rotary drive device; the bottom of the base is fixedly connected with the rotary drive device, and the laser emitter is installed above the base; the rotary shaft of the rotary drive device is connected with the drill rod at the bottom, and the drill rod is fixedly connected with the drill bit at the bottom; the rotary shaft, the drill rod and the drill bit are all hollow structures, and the hollow part of the drill rod is a guide hole; the laser emitted by the laser emitter passes through the rotary shaft, the drill rod and the drill bit in sequence to realize the function of laser-assisted rock breaking; the application realizes the cooperative matching of laser-assisted rock breaking and drill rotation, and the periodic emission of laser can reduce energy consumption; the laser directly acts on the rock breaking area, can effectively soften the lunar rock and improve the rock breaking efficiency of the drill bit; and the overall structure is compact and suitable for operation requirements under the lunar base extreme environment.