959 results about "Rock cutting" patented technology

The invention provides a multi-arm drill jumbo self-adaptive drilling track planning method based on visual navigation, which relates to the technical field of visual identification, and comprises the following steps: acquiring image data, identifying a working surface change area, generating a drilling grid with topological optimization, determining a target drilling position set and a drilling direction set, and performing drilling grouping. Generating a space-time conflict constraint for each group of drill holes, and iteratively optimizing to determine a multi-arm collaborative operation sequence; in the process of executing the multi-arm operation sequence, a structured light projection technology and a visual phase shift method are adopted to obtain a deformation field of the surface of a rock mass, rock mass response characteristics including elastic deformation, plastic deformation and abnormal deformation information are established, and according to the rock mass response characteristics, a progressive B-spline track adjustment algorithm is adopted to adjust the drilling track in real time.

The invention discloses an evaluation and improvement method and device for a tunnel blasting effect and a medium, and relates to the technical field of tunnel engineering.The evaluation and improvement method comprises the steps that a tunnel coupling data set is collected, space registration and three-dimensional shape reconstruction are conducted, fracture space distribution is formed, risk probability mapping is conducted on the fracture space distribution, and a fracture risk thermodynamic diagram is output; the fracture risk thermodynamic diagram and tunnel rock mass data are input into a digital twin blasting model, a load mapping layer carries out load gradient distribution, a rock mass response deduction layer carries out stress wave propagation simulation and damage accumulation quantification, an optimized blasting number instruction set is generated, and a drill jumbo is driven to execute blasting operation and vibration monitoring according to the optimized blasting instruction set. And actual blasting effect parameters are obtained. According to the method, accurate simulation of geological conditions and optimal adjustment of blasting parameters are realized through the digital twin blasting model, and meanwhile, refined and interpretable evaluation of the blasting effect is realized through vibration monitoring and error propagation modeling of the actual blasting effect.

Integrated underwater rock drilling and splitting device, characterized in that it comprises: a supporting structure (1); a drilling unit (2) mounted on the support structure (1); a splitting unit (3) mounted on the support structure (1), wherein the splitting unit (3) and drilling unit (2) are arranged at intervals; and wherein the splitting unit (3) comprises a splitting rod (301) provided with a plurality of telescopic piston segments (302); a positioning and borehole alignment system comprising a positioning pin (401) and at least one auxiliary positioning device, wherein the positioning pin (401) is designed to bear against and be fixed to a rock body (7) and the auxiliary positioning device is arranged relatively fixedly on the support structure (1); a workstation switching mechanism (5), wherein the support structure (1) is arranged on the drive side at a switching end of the workstation switching mechanism (5); wherein the workstation switching mechanism (5) is configured as a rotary switching mechanism or a translation switching mechanism; wherein the rotary switching mechanism is configured to drive the support structure (1) to rotate so that the splitting unit (3) is able to move and be aligned with the drilling position of the drilling unit (2); and wherein the translation switching mechanism is configured to drive the support structure (1) to translate so that the splitting unit (3) is able to move and be aligned with the drilling position of the drilling unit (2); and a connecting rod (6), wherein the connecting rod (6) is adapted to be connected to a ship-based manipulator arm in order to adjust the underwater depth of the device.

The invention discloses a self-adaptive rock drilling control method and a drill jumbo. The self-adaptive rock drilling control method comprises the steps that S1, initialization is conducted, specifically, parameters including the quality of a drilling component, a drilling included angle, a calculation coefficient, target propulsion pressure, target impact pressure and control parameters are initialized based on a control system before operation; s2, drilling is conducted according to the initialized parameters, the number of drill rods is recorded by a drill rod number counter, and impact pressure compensation and propelling pressure compensation are conducted according to the increased number of the drill rods; s3, adjusting the output propulsion pressure based on the difference between the target rotation pressure and the actual rotation pressure to enable the actual rotation pressure to tend to the target rotation pressure, adjusting the impact pressure based on the relation between the effective impact pressure and the effective propulsion pressure to enable the effective impact pressure to tend to the target impact pressure, and ensuring that the effective rock drilling parameters at the drill bit are matched with the rock. It is guaranteed that the effective propelling pressure and impact pressure at the drill bit meet the requirements, and therefore the drilling precision and quality are guaranteed.

The invention relates to the technical field of tunnel construction, and discloses a rapid construction method and system for a lower step with an inverted arch of a horizontal rock stratum large-section tunnel, and the method comprises the steps: constructing a three-dimensional geological modeling system to carry out advanced geological forecast on a tunnel construction region; the three-arm drill jumbo is used for conducting self-positioning, geological self-adaptive intelligent hole arrangement, dynamic optimization of drilling parameters and dynamic allocation of drilling tasks through three-arm cooperative control; calculating the vector deviation between the actual excavation contour and the design contour; marking a preferential injection area based on a three-dimensional laser point cloud technology, and dynamically adjusting an injection track and thickness according to back break data; a multifunctional drilling and grouting integrated trolley is adopted for implementing pipe shed supporting, advanced small guide pipe reinforcement, pre-grouting reinforcement and anchor rod reinforcement; the main mechanical arm assists the trolley in drilling and laser scanning acceptance inspection of the feet-lock bolt; re-spraying to the designed thickness by adopting a wet spraying manipulator; the problems that an existing tunnel lower step inverted arch construction method is low in construction efficiency and large in construction risk are solved.

The invention discloses a multi-mode drilling process multi-dimensional parameter real-time while-drilling monitoring system, belongs to the technical field of while-drilling monitoring, and solves the problems that a monitoring system matched with an existing engineering driller is insufficient in transient feature capture, deficient in data timeliness and diversity, limited in application scene and low in data reliability under a strong vibration working condition. The system comprises a rock drilling subsystem, a hydraulic pump station auxiliary subsystem, a control subsystem and a data collecting and monitoring subsystem. According to the invention, millisecond-level real-time monitoring, data visualization and storage can be carried out on multi-dimensional parameters such as drilling stroke, pressure, flow, frequency, displacement, acceleration and the like in the while-drilling process. The system is high in integration level, quick in response, complete in data and high in adaptability, and reliability, effectiveness, comprehensiveness and timeliness of while-drilling data are remarkably improved.

The invention discloses a construction method applied to underground mine vertical shaft surrounding rock condition improvement. The construction method comprises the steps that a flat working face is cleaned, a temporary water nest is arranged for drainage, the drilling position is projected, and a down-the-hole drill is debugged; rock drilling is conducted according to the designed angle, direction and depth, propelling pressure is adjusted along with the depth, and cleaning and plugging are conducted after hole forming; grouting pipes with holes are used as pipe sheds to be driven into the holes, and are welded into a whole through annular steel bars; single-liquid-slurry and double-liquid-slurry segmented grouting is adopted, and the grouting pressure is controlled; during construction, grout diffusion and stratum deformation are monitored, after surrounding rock consolidation reaches the standard, weak blasting is matched with a small excavator for excavation, and after acceptance inspection is qualified, reinforcing steel bars are bound, formworks are installed, and concrete is poured. Compared with the prior art, the problems of collapse and water gushing of the vertical shaft under the strong weathering and water-rich geology can be solved, and the defects of insufficient supporting strength, grouting uniformity, construction efficiency and long-term stability in the traditional technology are overcome.

The invention belongs to the technical field of rock drills, and discloses a rotary impact type hydraulic rock drill. The rock drilling bit group is arranged in one side of the rock drilling machine shell; the rotating mechanism is arranged at the top of the rock drill shell, and the rotating mechanism is located above one side of the rock drill bit set; according to the technical scheme, by arranging the hydraulic mechanism, the cooling and cleaning assembly and the driving assembly, when the hydraulic mechanism is started to make the output end collide with one end of the middle of the rock drilling bit set back and forth, the top of one side of the driving assembly is driven to move up and down back and forth; cold water in one side of the cooling and cleaning assembly can be pumped back and forth into the other side of the cooling and cleaning assembly, and then the cold water can be sprayed out through the other side, so that heat generated by the impact part of the hydraulic mechanism and the rock drilling bit group can be cleaned and cooled; the service life of parts in the rock drill shell is prevented from being influenced by high temperature.

The medium-length hole mining method under the complex geological condition comprises the following steps that S1, a stope is divided, specifically, the stope is divided into two stages along the inclination direction of an ore body, and bottom columns are not reserved; s2) roadway construction; s3) stoping: taking the cutting raise and the transverse cutting roadway as double free surfaces, and constructing medium-length hole blasting in a retreating manner from the middle to the two ends; s4) drilling and blasting; s5) transporting the ores; and S6) ventilation and dust prevention. The method is suitable for mining inclined ore bodies with thick ore bodies, unstable IV-level surrounding rock stability, extremely unstable V-level local parts and inclination angles of 30-50 degrees. By means of the non-sill-pillar structure and the 25-m stage interval and the through ore removal access road of the outside-vein transportation roadway, 15%-20% of sill pillar resource loss in a traditional method can be eliminated, the ore recovery rate is greatly improved, dead ore resources in a mining area are activated, and the service life of a mine is prolonged.

The invention relates to a harmless treatment test method and device for oil-based rock debris deoiling products, and belongs to the technical field of organic pollutant detection.The harmless treatment test method for the oil-based rock debris deoiling products comprises the following steps that layering multi-point sampling is conducted on treated tailings through a sampling mechanism, and a tailings mixed sample is obtained; pre-treating the tailing mixed sample to obtain a to-be-detected sample, and detecting and analyzing the to-be-detected sample by adopting a gas chromatograph to obtain the residual quantity of petroleum hydrocarbon in the to-be-detected sample. The method has the advantages that an operator can conveniently judge whether the residual amount of petroleum hydrocarbon in the treated tailings meets the preparation requirement or not, and the quality of a sintered brick or baking-free brick finished product is guaranteed.

The invention relates to the technical field of underground mining of metal ore deposits, in particular to a staged ascending pillar-free large-diameter deep-hole lateral caving subsequent filling mining method, which comprises the following steps of: dividing a steeply inclined medium-thickness ore body into a plurality of stages, and dividing large and small stopes in the stages without leaving pillars; digging a flat-bottom ore removal structure at the bottom of the stope, and digging a rock drilling chamber at the bottom of the stope at the upper stage; digging a cutting well at the end part of the stope and expanding the cutting well into a cutting groove; large-diameter parallel deep holes are drilled downwards in the rock drilling chamber, and lateral ore caving is carried out with cutting grooves as free faces; the caved ore is transported out by a carry-scraper through the flat-bottom ore removal structure; and the stope goaf is subjected to subsequent cemented filling. The small stopes are firstly stoped and filled with the 1: 4 full-tailing cementing material, and after the small stopes are solidified, the large stopes are stoped and filled with the 1: 20 full-tailing cementing material. The method has the characteristic of ascending stoping among stages, and has the advantages that pillar-free continuous stoping is realized, and the rock drilling chamber is used as a flat bottom ore removal structure to be reused.

The invention provides a downward parallel medium-length hole sublevel filling mining method for a low-grade broken ore body, belongs to the technical field of mining, and solves the problems that a traditional mining method is low in mining efficiency and high in cost under complex geological conditions. Downward parallel medium-length holes are adopted in each section for drilling and blasting, efficient stoping is achieved in cooperation with remote control ore removal and supporting equipment, an interbed filling technology is adopted in a goaf to be combined with a reinforcing mesh structure to form an artificial roof, stress and displacement changes of a filling body are monitored in real time through a ground pressure monitoring system, and the stoping sequence and supporting parameters are optimized. According to the method, the efficiency and safety problems of a traditional mining method in low-grade and broken ore deposit and three-under resource mining are solved, large-scale, low-cost, safe and efficient mining is achieved, and the method is suitable for ore body mining under complex geological conditions.

The invention relates to the technical field of mining dust removal devices, in particular to a dust removal device for rock drilling equipment roadway tunneling, which comprises a casing, a filter cartridge, a centrifugal fan and a pulse back flushing unit, the centrifugal fan and the pulse back flushing unit are mounted on the casing, the casing is divided into a suction cavity and a filter cavity by a partition plate, and the filter cartridge is mounted below the partition plate and vertically extends in the filter cavity. A back flushing mechanism capable of lifting in a reciprocating manner is arranged in the filter cartridge and comprises an annular flow guide box and a plurality of nozzles uniformly distributed on the peripheral side of the annular flow guide box. The reverse blowing mechanism is used for performing reverse blowing cleaning compensation on the filter cartridge in a gap between two times of pulse reverse blowing, a composite working mechanism of periodic main pulse and intermittent continuous auxiliary reverse blowing is formed, dust on the surface of the filter cartridge and a shallow layer of filter holes can be removed in real time, the dust removal difficulty of subsequent pulse reverse blowing is reduced, it is ensured that the air permeability of the filter cartridge is stable, and the service life of the filter cartridge is prolonged. And the ash removal capacity is better matched with the dust deposition rate, and the situation that the dust removal efficiency is reduced due to intermittent cleaning deficiency is avoided.

The present invention relates to the technical field of tunnel construction equipment, and more specifically, to a combined boom for tunnel construction. The boom includes a rotary rock drilling device. A first rotary mechanism is mounted on a mechanical arm, enabling the device to rotate horizontally. The mechanical arm is connected to a drilling gripper mechanism via a third rotary mechanism. The drilling gripper mechanism is located at the end of the mechanical arm. A connecting base is connected below the third rotary mechanism. The connecting base and the drilling gripper mechanism are connected to a first pitch cylinder. The purpose of the combined boom is to simultaneously facilitate tunnel arch installation and rock drilling during tunnel construction, thereby enhancing the mechanization of the engineering trolley and improving construction efficiency.

The invention discloses an anti-deflection control method and system of a rock drilling device, a storage medium and equipment. The anti-deflection control method of the rock drilling device comprises the steps that the three-dimensional coordinates of a drilling hole opening and the dip angle and azimuth angle of a drilling arm are obtained; comparing the obtained three-dimensional coordinate of the drilling hole opening and the inclination angle and azimuth angle of the drilling arm with the three-dimensional information of the designed hole position to obtain the deviation value of the position and posture of the drilling arm; when the deviation value of the position and posture of the drill arm exceeds a preset deviation value, adjusting parameters of the drill arm are output; when the deviation value of the drill boom pose does not exceed the preset deviation value, the propelling pressure of a hydraulic system of the rock drilling device and the rotating torque of the rock drilling device during drilling are obtained; in response to sudden change of the obtained propelling pressure and rotating torque, adjusting parameters of the hydraulic system of the rock drilling device are output according to the sudden change direction. Dynamic monitoring and real-time correction of the whole drilling process are achieved, and the problem of drilling deflection is effectively solved.

The invention discloses a multifunctional all-in-one unit for drilling and blasting method construction and a construction technology, and relates to the technical field of tunnel construction, the multifunctional all-in-one unit comprises a rack assembly, a left drilling arch arm frame, a left drilling arm frame, a vertical arch arm frame, a right drilling arm frame, a right drilling arch arm frame, a guniting arm frame, a pumping system, a hydraulic system and an electrical system; a vertical arch module of the left drilling arch arm frame, a vertical arch module of the vertical arch arm frame and a vertical arch of the right drilling arch arm frame snatch a left arch frame, a middle arch frame and a right arch frame to carry out arch erecting and mesh welding operation; a charging hanging basket is arranged at the front end of the rack assembly; the rock drilling modules of the left drilling arch arm frame and the right drilling arch arm frame work independently or cooperatively in cooperation with the left drilling arm frame and the right drilling arm frame and are used for drilling anchor rod holes and blast holes. According to the invention, multiple functions such as drilling of blast holes, charging of a hanging basket, blasting, erecting of meshes, anchor rod operation, guniting and the like can be integrated, parallel working procedures or seamless connection of the working procedures can be realized, and the construction progress can be greatly improved.

The invention belongs to the technical field of steel performance intelligent analysis, and particularly relates to a high-strength and high-toughness rock drilling tool steel performance intelligent analysis method based on machine learning. The method comprises the following steps: firstly, collecting chemical components, process, microstructure images and performance data of rock drilling tool steel; then, a process-component prediction model and a microstructure image prediction model are constructed, and relations between component-process and microstructure characteristics and performance are mined respectively; then, the proportion of each component of the microstructure is obtained by combining finite element simulation with a genetic algorithm; predicting performance by using an XGBoost algorithm, comparing real indexes, and constructing an error feedback mechanism optimization model; and finally, solving an optimal parameter combination meeting a strength-toughness index by means of a particle swarm optimization algorithm. According to the method, multi-source data and multiple intelligent algorithms are fused, the defects of a traditional analysis method are effectively overcome, collaborative optimization of chemical components, the heat treatment process and the microstructure form is achieved, and the analysis precision and the production efficiency are improved.

The utility model belongs to the technical field of geological exploration, and particularly relates to a rock debris sampler for geological exploration, which comprises a sampler, guide strips are welded on the outer walls of two sides of the sampler, and a sleeve column is movably sleeved at the bottom of the sampler; four mounting parts are welded on the outer wall of the sleeve column at equal intervals, a bracket is fixedly mounted in an opening of each mounting part, an included angle between each bracket and each mounting part is 45 degrees, and the internal diameter of the sleeve column is larger than that of the sampler. Then the guide strips on the two sides of the sampler are in butt joint with the corresponding group of inner strips, the sampler is started, the spiral blades on the sampler can work on the rock, the sampler is pressed downwards, the sampler can move downwards along the tracks of the two groups of inner strips and the inner strips, and the inner strips and the inner strips are separated from each other. Meanwhile, under the cooperation of the sleeve column and the bracket, the stability of the sampler during movement can be effectively guaranteed, so that the whole rock debris collection work is more convenient and faster.

The mine rock drilling robot comprises a walking mechanism, a telescopic mechanical arm and a rock drilling mechanism, the walking mechanism comprises an outer supporting frame and an inner supporting frame, first hydraulic supporting legs are vertically fixed to the four corners of the outer supporting frame, and second hydraulic supporting legs are vertically fixed to the four corners of the inner supporting frame; the inner supporting frame is connected to the outer supporting frame through a moving mechanism, and the first hydraulic supporting leg and the second hydraulic supporting leg can be alternately supported or jointly supported to the ground. The telescopic mechanical arm is installed on the inner supporting frame and used for being folded and stored and stretching out to the position below the rock drilling position. The rock drilling mechanism is installed at the end of the telescopic mechanical arm and comprises a rock drilling machine and a stable supporting mechanism, and the stable supporting mechanism is used for abutting against a top and bottom plate of the stope to stabilize the rock drilling machine. The walking mechanism can adapt to the ground shape, and stable movement is guaranteed; the height requirements of different mining faces are met through the telescopic mechanical arm; the stable supporting mechanism is vertically supported on the mine ground and the top of an ore body, and the safety and stability of equipment are improved.

The present application belongs to the field of phosphorite deposit mining technology, and particularly relates to a method for recovering a phosphorite layer bottom pillar under a filling body, which comprises arranging a segmented transport roadway in a sandwich in the top and bottom surface of the bottom pillar to reduce the construction engineering quantity of the rock drilling roadway and the ore roadway; first constructing a filling roadway intersecting on both sides of the segmented transport roadway, filling the filling body roadway with high-strength filling material, and then constructing the segmented transport roadway in the filling roadway, so that the segmented transport roadway is finally topped and bottomed with the sandwich rock, and both sides of the segmented transport roadway are high-strength filling bodies, which greatly improves the strength of the segmented transport roadway and reduces the influence of ore mining. Further, the present application proposes an invention point of leaving a permanent ore pillar in the ore body on one side of the sandwich bottom plate to improve the safety of the segmented transport roadway and the ore room mining; in order to further improve the safety of the ore room mining, the present application first proposes an ore room adopting an eight-character-shaped stope structure.

The invention discloses a drill rod signal transmission monitoring control method, which comprises the following steps: capturing drill rod axial vibration waveform and peripheral magnetic field vector change data in real time, analyzing and marking potential resonance frequency points, calculating magnetic field intensity break variable, and judging a geomagnetic anomaly region; determining the relevance between a resonance frequency point and geomagnetic mutation through time alignment processing, and separating and coupling interference signals; generating an anti-phase damping wave according to the resonance frequency point, dynamically adjusting the amplitude, and injecting a pre-compensation phase to counteract carrier offset; the signal-to-noise ratio and the phase error after suppression are calculated in real time, and a parameter readjustment process is triggered to ensure the suppression effect; when the rock drilling vehicle enters a new rock stratum, parameters are automatically recorded and updated to adapt to different rock stratum interference characteristics; the drilling stability and the signal quality are obviously improved, and the equipment loss and the maintenance cost are reduced.

The invention belongs to the technical field of rock stratum drilling, and provides a rock drilling device for mounting an anchor rod, which comprises a rock drilling unit for drilling a rock stratum, a power unit for driving the rock drilling unit to rotate and move, and a protection unit for preventing crushed rock from splashing to hurt people when the rock drilling unit drills the rock stratum; the bearing seat is rotated clockwise, so that the drill rod further moves along the inner wall of the bearing seat, one end of the drill rod is gradually attached to the adjusting block fixed to one side of the crushing cutter, the drill rod pushes the crushing cutter to gradually extend out of the containing groove through the adjusting block, and therefore the drilling hole diameter of the crushing cutter is adjusted; the device can be adjusted according to the hole diameter of a to-be-drilled hole, the application range of the device is expanded, the construction cost is reduced, and meanwhile an operator does not need to carry drill bits with different hole diameters to drill grouting holes with different hole diameters when installing an anchor rod.

The invention discloses an intelligent operation method and system for a double-arm drill jumbo of a large-section tunnel, and relates to the field of tunnel construction, the geometry, integrity, dust and humidity data of a section are collected in real time through a laser radar, an IMU and a surrounding rock pressure and environment sensor, and an operation environment database is constructed and updated; by combining the strength grade of the surrounding rock and the distribution of the soft layer, the posture of the arm support, the chiseling frequency and pressure and the rock entering angle of the bucket teeth are adjusted online in a self-adaptive mode; switching among a high-frequency impact mode, a bucket tooth wedging prying mode and a free face gravity automatic rock breaking mode according to working conditions; excessive impact is restrained and protection is triggered through a vibration monitoring closed loop, efficiency is improved, energy consumption is reduced, secondary damage is reduced, and construction safety and quality are guaranteed.

The invention discloses a drill jumbo positioning device, and relates to the technical field of drill jumbers.The drill jumbo positioning device comprises a fixing base, a rock drilling mechanism is arranged on one side of the fixing base and comprises a supporting arm, the supporting arm is hinged to one side of the fixing base, a base plate is fixedly connected to one end of the supporting arm, and a rock drilling assembly is fixedly connected to the middle of the base plate; the output end of the rock drilling assembly is connected with a rock drilling punch, the rock drilling assembly is used for driving the rock drilling punch to drill rock, the positioning visual camera is located on the side edge of the base plate and used for positioning the rock drilling punch, and the protective cover is located on the outer side of the positioning visual camera and used for protecting the positioning visual camera. The cleaning mechanism is located on the outer side of the protective cover. According to the design, the positioning visual camera is conveniently protected by utilizing the protective cover, and the protective cover is conveniently cleaned by utilizing the cleaning mechanism in the later period, so that the auxiliary positioning function of the positioning visual camera is prevented from being influenced.

The invention discloses an oil exploitation underground injection-production device with an anti-blocking function, and relates to the technical field of offshore drilling and oil extraction, the oil exploitation underground injection-production device comprises a drill rod and a drill bit, and further comprises a fixing cylinder rotationally connected to the top of the drill bit and installed at the bottom of the drill rod, and a plurality of water holes are formed in the drill bit in a penetrating mode; the driving mechanism is mounted in the fixed cylinder and is used for driving the drill bit to rotate; the linkage eye cleaning mechanism comprises a turntable mounted on the driving mechanism and a plurality of ejector rods mounted on the turntable; the sub-control mechanism comprises an adjusting seat mounted in the fixed cylinder and an elastic reset assembly mounted outside the ejector rod; according to the technical scheme, all the ejector rods are driven to sequentially clean blockages in all the water holes, the smoothness of the water holes is guaranteed, the problem that the water holes are blocked by rock debris generated by well drilling is solved, all the ejector rods are driven to sequentially clean the blockages in all the water holes, and the problem that the throughput of drilling fluid is affected when the water holes are cleaned at the same time is solved.

The invention relates to the technical field of grinding devices, in particular to a surface grinding treatment device for rock drilling large bit shank machining, which comprises a bedplate, and further comprises a three-jaw chuck arranged above the bedplate through a reciprocating driving mechanism, a shell and an end cover fixed above the bedplate and mutually fixed, a plurality of sliding blocks are movably arranged on one side of the end cover, and the sliding blocks are movably arranged on the other side of the end cover. One end of each sliding block is rotationally connected with a grinding wheel, and a feeding mechanism for driving the multiple grinding wheels to be combined synchronously is arranged on the inner side of the shell. The reciprocating mechanism drives the three-jaw chuck and the bit shank to do reciprocating motion, meanwhile, through the feeding mechanism, the multiple grinding wheels can be synchronously combined by a very small distance when the bit shank does reciprocating motion every time, the micro-feeding effect is achieved, multiple spline grooves are ground at the same time, and the grinding efficiency is improved. The grinding machining efficiency is improved, it is guaranteed that the grinding depth of each spline groove is kept consistent, and the machining accuracy of the spline grooves is improved.

Disclosed are a shearer having an adaptive variable cutting line distance and a cutting method for the shearer. The shearer comprises a box (1), a traveling mechanism (2), a pitch mechanism (3), a longitudinal moving mechanism (5), a cantilever, and cutting mechanisms (7). By means of the traction of a longitudinal moving mechanism, a cantilever of the shearer drives a drum cutting head to perform a longitudinal reciprocating cutting motion, thereby improving the cutting range and efficiency; moreover, by regulating the longitudinal movement speed of the cutting head, the cutting line distance of the shearer can be significantly decreased, the problem of insufficient cutting capacity caused by a small cutting thickness during coal rock cutting is solved, and the risk of failure and damage of mechanisms is reduced; by means of the arrangement of sensors, coal rock can be classified into normal-hardness coal rock, high-hardness coal rock, and ultra-high-hardness coal rock on the basis of load conditions; and when the hardness is relatively high, the cutting thickness and the cutting line distance can be decreased so as to improve the cutting capacity, and when the hardness is relatively low, the cutting thickness and the cutting line distance can be appropriately increased so as to increase the cutting speed, so that the shearer can adapt to relatively complex working conditions, thereby achieving high-quality and high-efficiency cutting.

The invention provides a safe and efficient combined mining method for a near-surface thick and large low-grade ore body under a broken ore rock condition, and belongs to the field of mining. The first-step stope adopts a downward large-diameter deep hole subsequent filling method, horizontal and vertical anchor cable holes are constructed in a drilling chamber at the top of the stope, and the vertical anchor cable holes are communicated with the ground surface; a subsection medium-length hole subsequent filling mining method is adopted in the stope in the second step, and downward anchor cable holes are constructed in the earth surface above the stope to the boundary of the ore body; after cement mortar is injected into the anchor cable holes, orifice anchor cables are connected in series, prestress is applied, and a combined anchor cable supporting system is formed; filling immediately after the stope is mined in the first step; and after the filling body reaches the preset strength, filling after mining is carried out on the second-step stope. Through application of the combined supporting structure and the mining technology, near-surface thick and large low-grade ore body resources can be safely and efficiently mined, underground occurrence resources are fully utilized, and continuous high-quality development of mine enterprises is guaranteed.

A kind of 7 type shield support under horizontal non-blasting mining method, belong to the technical field of ore body mining, it includes the following steps, S1, in the vein along the upper section in the tunnel, install 7 type shield support, 7 type shield support is from east side along the vein up mountain, start through joist series connection arrangement to west side along the vein up mountain;S2, after installation and arrangement are completed, from the middle position of along the vein to both ends, using rock drill to carry out retreating type slope rock drilling, according to the angle of 15 ° to both sides mining, mining to vertical height drops 1m, then, horizontal retreating type rock drilling 1m, during, shovel truck follows and carries out in and out slag operation, transports ore to ramp, then, through ore chute connecting channel, transports to ore chute, unloads to ore chute, until rock drilling to end only remaining body length about 4m, will rock drill in stope connecting channel, turns around, will end remaining 4m advancing type rock drilling.The present application simplifies the recovery process, can effectively improve the production efficiency of ore block, and lower the cost of ton ore.

A cluster down-the-hole hammer (100), comprising: a hammer body (1), the hammer body (1) comprising a hammer frame (11) and a plurality of sub-hammers (12), wherein a first cuttings discharge chamber (111) is defined in an inner side of the hammer frame (11), and penetrates along two axial ends of the hammer body (1), the plurality of sub-hammers (12) are spaced apart on the inner side of the hammer frame (11) in the circumferential direction of the hammer frame (11), each sub-hammer (12) is provided with an impact chamber (121), and a first cuttings discharge channel (113) is further provided between two adjacent sub-hammers (12); drill rods (2), each drill rod (2) comprising a drill frame (21), an air supply pipe (22) and cuttings discharge pipes (23), wherein the drill frames (21) are connected to one axial end of the hammer frame (11), a second cuttings discharge chamber (211) is defined in an inner side of each drill frame (21), and is in communication with the first cuttings discharge chamber (111), the air supply pipes (22) are respectively in communication with the impact chambers (121) of the plurality of sub-hammers (12) so as to supply air to the plurality of impact chambers (121), and the cuttings discharge pipes (23) are in one-to-one correspondence and communication with the first cuttings discharge channels (113); and a coring mechanism (3), the coring mechanism (3) being vertically adjustably arranged in the second cuttings discharge chambers (211), so as to remove rock cuttings from the second cuttings discharge chambers (211).