1021 results about "Reamer" patented technology

A reamer drill bit includes a body having an outer surface defining a plurality of grooves, and a cutter arm with an interior surface. Each groove extends from a first end of the body to a second end of the body and has at least one groove recess, at least one groove peak connected by a sloped section, and a track arranged in the sloped section. The cutter arm is slidably attached to the body, is configured to expand radially away from the body, and is configured to slide longitudinally relative to the body along the track. The interior surface of the cutter arm includes at least one arm valley, and at least one arm protrusion. The at least one groove recess receives the at least one arm protrusion and the at least one arm valley receives the at least one groove peak.

This invention relates to a reamer assembly (6) for enlarging a substantially horizontal pilot hole (14) in the ground to produce a bore hole (18), including a cutter (21) which is rotatable about an axis X-X. A gear box (20) is positioned on a first side of the cutter (21) for interacting with a drive shaft (33) which is rotated about the axis X-X by a drive apparatus (2) outside the pilot bore hole (14) and a body (15) positioned on a second side of the cutter (21) for transferring thrust from a thrust apparatus (4) outside of the enlarged bore hole (18) to the cutter (21).

The invention relates to the field of constructional engineering concrete detection, in particular to a reamer bit and a concrete repairing method.The reamer bit comprises a mounting base, at least two drill arms and at least two supporting rods; one end of the drill arm is hinged with the mounting seat, a fixing pipe is arranged between the hinge points of the drill arm and the mounting seat, the fixing pipe is connected with a positioning rod in a sliding manner, one end of the supporting rod is hinged with the positioning rod, and the other end of the supporting rod is hinged with the drill arm. When the reamer bit is used, the angle of the drill arm can be flexibly adjusted by pressing the positioning rod, the hole diameter of a reaming hole can be accurately controlled according to actual repairing requirements, and the reamer bit is suitable for repairing scenes of coring holes of different sizes and depths; the formed horn mouth with the wide inside and the narrow outside can be embedded into original concrete like a tenon after concrete is poured, the combining capacity of new concrete and old concrete is greatly improved, and it is guaranteed that a repaired area is not prone to separation.

The invention belongs to the technical field of coal seam pressure relief and permeability improvement, and relates to a core rod jacking type mechanical reaming device and method, and the device comprises a core rod jacking type reamer, a core rod drill rod, a combined type rotary water tail and a hydraulic propeller which are sequentially connected from head to tail. The core rod jacking type reamer adopts a core rod pushing linkage structure, and the opening or closing state of a tool arm is accurately controlled; the core rod drill rod provides core rod guiding conduction, and deep hole reaming is achieved. The composite rotary water tail is used for rotary dynamic sealing connection of the drill rod core rod and the hydraulic propeller; the hydraulic propeller is used for being connected with hydraulic power and providing hydraulic propelling power for the guide rod. According to the device, hydraulic pressure serves as power to achieve rapid unfolding and retracting of the reaming cutter, the reaming speed is increased, the gas extraction drilling and reaming requirements are met, stable operation can be achieved under the complex geological condition, and the high field popularization value is achieved.

The invention provides a reverse-circulation large-diameter binding type down-hole hammer reamer bit and a slag discharging method. The reverse-circulation large-diameter binding type down-hole hammer reamer bit specifically comprises a drill bit shroud, an air distribution chamber, a central pipe combination, a down-hole sub hammer and a slag suction opening, wherein the slag suction opening is formed in the bottom of a central pipe and used for sucking crushed rock slag into a drill rod through negative pressure so as to discharge the rock slag. For bedrock large-diameter water-containing stratum reaming drilling, the unique slag suction opening is formed in the bottom of the center pipe, tail gas of the down-the-hole hammer forms entrainment airflow to push liquid in a drill hole to return to the ground surface from the slag suction opening, and the stable continuous reverse circulation slag discharging effect is achieved by means of gas lift water level rising of tail gas pressure of the down-the-hole hammer; and the drilling efficiency of the large-diameter binding type down-the-hole hammer is improved, and the stable and continuous deslagging effect is extremely good in construction application.

The invention discloses a reamer electromechanical driving mechanism and method capable of detecting the position state of a blade, and relates to the technical field of tools of petroleum drilling engineering, the reamer electromechanical driving mechanism comprises a power assembly, a lead screw assembly, an ejector rod, a locking assembly, a rotation detector and a displacement detector which are mounted in a drill collar; the power assembly is connected with the lead screw assembly, the lead screw assembly is connected with the ejector rod, the ejector rod is connected with the reamer blade, the power assembly rotates and drives the ejector rod to move up and down through the lead screw assembly, and the ejector rod moves up and down to drive the reamer blade to be unfolded or folded. The locking assembly is assembled on the ejector rod, and after the reamer blade is unfolded in place, mechanical self-locking is conducted on the ejector rod. The rotation detector is assembled beside the lead screw assembly to detect rotation of the lead screw assembly, and the displacement detector is assembled beside the ejector rod to detect up-and-down movement of the ejector rod. The opening and closing state of the cutter wing is measured and uploaded through the rotating detector and the displacement detector, the cutter wing is expanded in place, the underground condition can be judged easily, and controllable multiple reaming is achieved.

A secondary shaft formation construction method based on a raise boring process. A directional drilling rig (3), a composite drill pipe (5) and a directional drill bit (4) are used for drilling a directional borehole (8), and after the directional borehole (8) is drilled, the composite drill pipe (5) is tripped out, a deviation of the directional borehole (8) is measured, and a raise boring machine (9) is installed; a small raise boring pipe (10) and a reamer bit (11) are connected, and the reamer bit (11) drills along the directional borehole (8) for secondary reaming to form a pilot hole (12); then, the reamer bit (11) is replaced with a small raise boring bit (13), and the small raise boring pipe (10) is tripped out to drive the small raise boring bit (13) to excavate along the pilot hole (12) to form a guide shaft (14); the small raise boring pipe (10) and the small raise boring bit (13) are removed, a large raise boring pipe (15) is tripped into the guide shaft (14) downwardly along a design direction of a vertical / inclined shaft (17), a large raise boring bit (16) is connected, and the raise boring machine (9) drives and lifts the large raise boring bit (16) to excavate along the guide shaft (14) to form a shaft. On the basis of first excavating the guide shaft (14) using the raise boring machine (9), a secondary reaming technology is implemented, so that the influence of a deviation of the directional borehole (8) on shaft formation is effectively eliminated.

The present invention discloses a method for processing deep and long precision step holes in an intermediate casing. Before the support plate is welded to the intermediate casing, a through hole is first processed on the insert, and then the insert is welded to the support plate. The support plate is then welded to the intermediate casing to complete the processing of each end face of the casing. Next, spiral milling is used to process the step hole with the smallest aperture, and then the remaining step holes are processed by spiral milling. The step holes with high positioning and precision requirements retain processing allowances, and finally a reamer is used to process the step holes with high positioning and precision requirements. The present invention solves the problem of iron chips wrapped around the tool, avoids tool breakage, and reduces processing costs. In addition, the present invention also improves the surface quality of the precision step holes and enhances processing efficiency.

The invention relates to the technical field of program control, in particular to a reamer machining path intelligent optimization method and system based on artificial intelligence, and the method comprises the following steps: collecting a reamer main shaft load torque and a Z-axis feed current in the process that a reamer cuts into a workpiece, and generating a reaming contact area resistance characterization quantity; and mapping the resistance characterization quantity of the reaming contact area to generate a hardness distribution characteristic value of the workpiece material. According to the method, differential operation is carried out on a generated nonlinear track, the acceleration change rate of the nonlinear track is extracted, the dynamic complexity of a motion state is quantitatively evaluated, the dynamic complexity is combined with a contour error predicted by AI, a dynamically weighted feed-forward compensation amount is formed, and when a motion instruction is complex and the system following capability faces challenges, the compensation effect is enhanced; according to the predictive compensation mechanism, active suppression can be carried out before the servo error actually occurs, and the contour tracking precision of a complex nonlinear instruction is improved.

The invention relates to a cutter suction dredger complex section accurate excavation control method and system, and the method comprises the steps: firstly constructing a design section based on geological survey data or construction scheme parameters, and collecting the data of high-precision positioning equipment and related sensors in real time; comprise ship positioning latitude and longitude coordinates, a bridge angle, trunnion draft, a tide level, a compass direction, a trolley stroke and a transverse moving winch cable speed, and the digging depth, the coordinates, the lifting and lowering speed and the transverse moving speed of the reamer are calculated by combining ship type parameters; the method comprises the following steps: firstly, acquiring a reamer coordinate, then acquiring a slope ratio, a sideline coordinate and a design depth of a current design section through the reamer coordinate, calculating a deviation between the reamer position and the design section in real time, and finally, automatically adjusting motion parameters of a reamer through a system built-in control model in a set excavation mode to ensure that an excavation track of the reamer accurately follows the design section. The efficient, accurate and uniform excavation effect is achieved, and the construction accuracy and efficiency of complex section excavation can be remarkably improved.

The invention provides a reaming device for geological exploration, and mainly relates to the technical field of geological exploration equipment. A hole expanding device for geological exploration comprises a drill rod and a hole expanding drill bit integrally and fixedly installed at the lower end of the drill rod. A guide assembly is fixedly installed at the lower end of the reamer bit, an annular groove is formed in the middle of the drill rod, a sliding sleeve located in the annular groove is installed on the outer portion of the drill rod in a sliding fit mode, an arc-shaped limiting plate is installed on the outer portion of the sliding sleeve in a hinged mode, and the arc-shaped limiting plate keeps stretching through a self-adaptive spring supporting assembly. The reaming device has the beneficial effects that through mutual cooperation of the guide assembly and the self-adaptive spring supporting assembly, the stability of the drill rod is improved, the drill rod is prevented from deviating, the perpendicularity and precision of a drill hole are improved, and meanwhile the stability of the reaming device in the working process is enhanced.

The invention provides a hydraulic engineering desilting device convenient to clean, and relates to the technical field of hydraulic engineering desilting, the hydraulic engineering desilting device convenient to clean comprises a main supporting frame, a main slurry conveying pump, side reamer supports and a side connecting frame, the lower portion of the main supporting frame is fixedly connected with the main slurry conveying pump, and the side reamer supports are arranged on the two sides of the main supporting frame; the upper portion of the side reamer support is in axial sliding connection with the side connecting frame, the upper portion of the main supporting frame is rotationally connected with a lower connecting rotating frame in the circumferential direction, the main supporting frame is fixedly connected with an upper sliding groove disc above the lower connecting rotating frame, and outer arc-shaped sliding grooves are formed in the two sides of the upper sliding groove disc. The main supporting frame is rotationally connected with an upper connecting rotating frame in the circumferential direction above the upper sliding groove disc. The distance between the side reamer support and the main slurry conveying pump is changed, the situation that machine halt is caused due to the fact that stones are clamped between the main slurry conveying pump and the reamer rotating head is reduced, and the problem that due to the design of the fixed distance between the reamer and the suction opening, the stones with the large particle size are prone to being clamped between the reamer and the suction opening, and equipment overload machine halt is caused is solved.

The invention discloses an aircraft joint reaming device, and relates to the technical field of reaming, the aircraft joint reaming device comprises a main body unit, the main body unit comprises a bottom table, the aircraft joint reaming device further comprises a reaming unit, and the reaming unit is arranged at the top of the bottom table; and the reaming unit comprises a chuck body rotationally arranged at the top of the bottom table, a penetrating pipe is arranged in the middle of the chuck body, a clamping jaw is arranged at the bottom of the chuck body, a hollow pipe is movably arranged in the penetrating pipe, and an annular cavity piece which is inflated and expanded is arranged at the bottom of the hollow pipe. Through the alternate work of the first-stage drill bit, the first-stage reamer, the second-stage drill bit and the second-stage reamer, a stepped hole with a certain depth is formed, and residues of cutting fluid containing chippings in the stepped hole are reduced in the rotating and up-and-down movement of the annular cavity piece; and the stability of drilling and reaming is improved under the cooperation of the inflation axial buffering of the annular cavity piece and the radial buffering of the cross-shaped vertical rod and the buffering piece.

The utility model discloses a rotary excavating reamer for a cast-in-place pile, and particularly relates to the technical field of engineering reaming equipment. The rotary excavating reamer for the cast-in-place pile comprises a connecting shaft, a driving box is arranged at the bottom end of the connecting shaft, a base is fixedly connected to the bottom of the driving box, a conical drill bit used for rotary excavating of the cast-in-place pile is fixedly connected to the bottom of the base, a plurality of rotating discs are rotationally connected to the base, and a positioning block is fixedly connected to each rotating disc. A tool apron is movably connected to the positioning block, and a reaming tool is fixedly connected to the tool apron. And a plurality of transmission connecting pieces are arranged in the driving box, the transmission connecting pieces are movably connected with the positioning blocks, and a driving mechanism is arranged in the driving box and used for driving the transmission connecting pieces to rotate so as to drive the reaming cutter to achieve angle adjustment. The utility model solves the problems that the linkage property of the reamer is insufficient in the process of adjusting the hole diameter of a reaming hole, and the assembly efficiency of the reaming piece is low in the disassembly and assembly process.

The invention relates to a fishing device and method for a falling reamer of a horizontal directional drill, and the fishing device comprises a manipulator clamp holder, a reamer drill rod telescopic fishing cylinder, and a universal head spherical hinge device for regulating and controlling the clamp holder, and the spherical hinge end of the universal head spherical hinge device for regulating and controlling the clamp holder is connected with a front-end drill rod; and the other end of the spherical hinge is connected with the main rod of the manipulator holder and the telescopic fishing barrel of the reamer drill rod. According to the salvage device and method, the universal head spherical hinge device is installed on the guide drill rod, the deviation between the axis of the salvage barrel and the axis of the drill rod of the reamer falling down accidentally is directly reduced through random rotation of the universal head and free stretching and retracting of the salvage barrel, and the butt joint capturing capacity of the salvage barrel is greatly improved; and meanwhile, the clamping distance and the clamping force of the manipulator clamping device can be flexibly adjusted through four mechanical arms, the manipulator clamping device can be applied to accident hole expanders of different sizes, and the fastening performance of clamping the falling hole expanders is ensured.

The invention relates to the field of reaming machines, and discloses an automobile safety belt bulb tube reaming tool which comprises a reaming table, a fixing seat is arranged in the middle of the upper face of the reaming table, a clamping structure is arranged on the fixing seat, a bulb tube is clamped and fixed on the reaming table through the clamping structure, and the reaming structure is moved to move back and forth. According to the ball tube reaming device, automatic reaming work is conducted on tube openings of ball tubes, the ball tubes can be automatically switched in the process that the movable reaming structure moves back and forth in a reciprocating mode in cooperation with a rotary switching structure, a lifting structure, a gear structure and a driving structure, reaming work of the tube openings in the two ends of the ball tubes is achieved while the positions of the ball tubes do not need to be adjusted again, and operation is more labor-saving and convenient. And meanwhile, by arranging the adjusting structure, the rotating angle can be flexibly adjusted according to the position of the port of the bulb tube, so that the position of the port of the bulb tube can be smoothly switched for reaming in the reaming process of the movable reaming structure, and the use is more flexible and convenient.

The invention belongs to the technical field of machining, and particularly relates to a sewing machine sleeve inner hole high-precision machining reaming and honing all-in-one machine which comprises a controller and a machine frame, a honing station, a reaming station and a feeding device are arranged on the machine frame, a clamp assembly and a honing device are arranged on the honing station, the honing device comprises a honing cutter rod and a honing strip, and the honing cutter rod is connected with the controller. A push rod is arranged in the honing cutter rod in a sliding mode, the push rod is driven by a first driving device to move, a clamp assembly and a reaming device are arranged on the reaming station, the reaming device comprises a reamer driven by a first rotating motor to rotate, and the first rotating motor transmits torque signals to a controller. When the controller detects that the torque T1 of the first rotating motor exceeds the torque set value Tset1 of the first rotating motor, the controller controls the first driving device to drive the push rod to increase the outward moving distance of the honing strip. Workpieces do not need to be turned over, the number of semi-finished products in a workshop is small, occupied space and capital cost are low, reworking caused by the fact that honing tools are abraded and machining is not in place is effectively avoided, machining time and cost are low, and production efficiency is high.

The utility model discloses a non-standard reamer with an angle R at the root. The non-standard reamer comprises a reamer rod, and a reamer handle is arranged below the reamer rod. A cutting blade is installed below the cutter handle, an R angle is arranged at the end of the cutting blade, an arc-shaped groove is formed in the cutter handle, a heat dissipation groove is formed in the cutter handle, the arc-shaped groove is communicated with the heat dissipation groove, the heat dissipation groove is annularly formed, and an auxiliary assembly is installed on the outer side of the heat dissipation groove. According to the non-standard reamer with the R angle at the root, the arranged cutting blades can be conveniently matched with the reamer handle for machining, machining can be conducted at the same time through the non-standard design of reaming and back chipping, the problem that the service life is shortened due to inconsistent abrasion speeds is solved, and the problem that the maintenance cost is increased due to separate treatment of the cutting edges is solved; the R angle on the cutting piece can be conveniently reamed and formed, the problem that the overall machining time is prolonged due to the fact that a tool needs to be replaced is solved, and the problem that existing tool connecting marks are troublesome to process is solved.

The invention relates to the technical field of pyrolysis devices, in particular to a biomass pyrolysis gasification device which comprises a microwave heating reactor, a pretreatment mechanism and a driving mechanism, the pretreatment mechanism comprises a cutting reamer, and the cutting reamer can push materials to gather towards the center during cutting; the driving mechanism is used for driving the barrel to rotate around the horizontal axis and the vertical center line of the barrel so that materials in the barrel can make full contact with the cutting reamers, and meanwhile the materials gathered towards the center are dispersed outwards so that the materials in the barrel can be dispersed and gathered repeatedly. Materials entering the barrel are conveyed to the center of the barrel through the cutting reamers with the angles, and meanwhile the driving mechanism drives the barrel to horizontally rotate, so that the materials entering the barrel can be thrown away towards the two ends in the barrel under the action of centrifugal force; therefore, the materials can be repeatedly dispersed and gathered in the pretreatment mechanism, so that a more perfect and comprehensive crushing processing effect can be achieved.

The invention relates to the technical field of metal cutting tools, in particular to a novel spiral groove hard alloy reaming tool and an efficient chip removal structure thereof.The novel spiral groove hard alloy reaming tool comprises a reamer and a main cutting edge arranged at the bottom of the reamer, a cutting set is arranged on the lower portion of the reamer and comprises a first chip removal groove and a second chip removal groove, and the first chip removal groove and the second chip removal groove are formed around the surface of the reamer; the size of the first chip groove is larger than that of the second chip groove. Wherein the edge is lower than the auxiliary cutting edge, and an inclined plane included angle alpha used for assisting chippings to slide into the second chip groove is formed between the auxiliary cutting edge and the edge; the auxiliary cutting edge is flush with the surface of the reamer and is flush with the two ends of the main cutting edge, through the design of the included angle alpha between the edge of the first chip discharging groove and the auxiliary cutting edge and the cooperation of the stepped structure that the edge is lower than the auxiliary cutting edge, the retention space of chips in a transition area is thoroughly eliminated, spiral scratches caused by chip scraping of a traditional cutter are avoided, and the service life of the reamer is prolonged. And a high-precision reference surface is provided for subsequent tapping.

In some implementations, apparatuses and methods are provided herein useful to reamer assemblies. In some implementations, a reamer assembly comprises a housing forming a channel extending therethrough and defining a longitudinal axis, a drive shaft at least partially positioned in the channel and configured to rotate about a first axis of rotation, a reamer configured to be removably coupled to the housing such that the drive shaft (i) engages the reamer and (ii) is configured to cause the reamer to rotate about a second axis of rotation that is different than the first axis of rotation, and a boss drill configured to be removably coupled to the drive shaft such that the drive shaft is configured to cause the boss drill to rotate about the first axis of rotation.

A reamer includes a shank portion extending from a rear end and a cutting portion extending from the shank portion to a front end. The cutting portion includes a plurality of cutting teeth separated by gashes. Each cutting tooth having a cutting edge extending in a longitudinal direction from the front end to proximate the shank portion. The cutting portion includes a margin trailing each cutting edge and extends along each cutting edge to proximate the shank portion. Each cutting tooth also has a primary relief formed between the cutting edge and the front end and a secondary relief extending longitudinally between the margin of one cutting tooth to the cutting edge of an adjacent cutting tooth. A width, W, of each cutting tooth increases in a radially outward direction with respect to the central, longitudinal axis when viewed from the front end of the reamer.

The utility model relates to the field of stamping dies, in particular to a circuit breaker wire holder stamping die which comprises a lower die body, a supporting block and an upper die body, a limiting groove is formed in the upper end of the lower die body and used for limiting a blank, the limiting groove extends towards the two ends to penetrate through the lower die body, and a feeding port and a discharging port are formed in the two ends of the limiting groove respectively. The supporting block is fixedly connected to the groove bottom of the limiting groove and used for supporting a blank, the upper die and the lower die are combined to form a die cavity, and a pre-punching piece, a modeling piece, an embossing piece, a reaming piece, a separating piece, a distance expanding piece, a trimming piece and a cutting piece are sequentially arranged in the die cavity in the direction from the feeding port to the discharging port. When the circuit breaker wire holder is machined, the blank is moved, so that the blank is sequentially subjected to pre-punching, modeling, embossing, chambering, separating, distance expanding, trimming and cutting, machining is completed, the blank transferring time is shortened, and the production efficiency and the production quality of the circuit breaker wire holder are improved.

The invention belongs to the technical field of underwater operation equipment, and particularly relates to an underwater unmanned aerial vehicle device for deep sea automatic mining and a using method thereof.The underwater unmanned aerial vehicle device comprises a guide pipe paddle body structure, a mineral exploration structure, a positioning navigation structure, a cutter suction pump body structure and a control module; the mineral exploration structure is provided with a mineral exploration end, the positioning navigation structure is provided with a mineral positioning end, the two ends of the cutter suction pump body structure are provided with a pump suction inlet end and a pump suction outlet end respectively, and the control input end of the control module is connected with the mineral exploration structure and the positioning navigation structure. The control output end is connected with the guide pipe paddle body structure, the ore breaking reamer structure and the cutter suction pump body structure. The problems that in the prior art, when a mining vehicle is used for deep-sea mine mining, adaptability is poor, maneuverability is low, pollution is large, and the automation degree is low, so that deep-sea mining difficulty is large, pollution is large, and cost is high are solved.

The invention relates to the technical field of geotechnical engineering exploration, in particular to a drilling device and method for geotechnical engineering exploration. Comprising a positioning bracket, a multi-section hydraulic rod, a mounting tank, a driving motor, a speed regulating mechanism, a drilling mechanism, a connecting ring, a reamer bit and a drilling bit. The problems that in the geotechnical engineering exploration drilling process in the prior art, the rotating speed of a drill bit cannot be automatically adjusted, and energy consumption is large can be solved; soil in excavated holes cannot be discharged, so that the excavation efficiency is greatly reduced; holes with different diameters cannot be excavated, limitation is large, and the application range is small. The rotating speed of the drilling bit can be automatically adjusted according to soil or rock encountered in the drilling process; through the discharging groove and the excavating groove of the reamer bit, excavated broken stones and soil can be discharged upwards; the rock-soil drilling device can meet the requirement for the rock-soil drilling diameter under different requirements, and the application range is greatly widened.

The invention relates to a mechanical reaming pressure relief method for a coal body elastic area, and belongs to the technical field of rock burst prevention and control. The method comprises the steps that a small-diameter hole is drilled in a plastic zone to penetrate to an elastic zone, the stress monitoring sensor is used for monitoring crustal stress in real time, the reaming device is started at the peak value to conduct large-diameter reaming, and meanwhile pulverized coal is cleaned through the powder discharging system. The method further comprises a planning step before drilling, wherein the distance between adjacent drill holes and the target depth of each drill hole are calculated and determined. The reaming device comprises a guide drill bit unit, a reamer main body, a reaming mechanical arm and a reaming blade, wherein a powder discharging hole is formed in the reamer main body. The method further comprises a real-time monitoring and effect evaluation step to optimize reaming parameters. According to the method, the gradual operation from small-diameter guide drilling to large-diameter mechanical reaming is carried out in the elastic area of the coal body, and real-time ground stress monitoring and powder discharging cleaning are combined, so that the internal stress of the coal body is effectively released, and meanwhile, the damage to a roadway structure is avoided.

The invention discloses an expansion pin assembly for a split reamer bit, the split reamer bit and an assembling method. The expansion pin assembly for the split type reamer bit comprises an expansion pin shaft sleeve, an expansion pin bolt and an expansion pin nut. An expansion head is arranged at one end of the expansion pin shaft sleeve, a first circular truncated cone through hole is formed in the expansion head, and the hole wall surface of the first circular truncated cone through hole is a first circular truncated cone surface; a locking head is arranged at one end of the expansion pin bolt, and the outer surface of the locking head is a second circular truncated cone face matched with the first circular truncated cone face. And when the expansion pin bolt is completely inserted into the expansion pin shaft sleeve, the second circular truncated cone surface is tightly attached to the first circular truncated cone surface. According to the expansion pin assembly, through the self-locking effect between the first circular truncated cone face and the second circular truncated cone face, the loosening phenomenon in the construction process can be effectively prevented, mechanical self-locking is achieved, an anti-loosening device such as a locking nut or a cotter pin does not need to be additionally arranged, and the connection reliability is greatly improved.

Disclosed are a coal mining system and a coal mining method. The coal mining system includes: a mechanical coal breaking module, an air lift reverse circulation module, a jet coal breaking module, and a coal-air-water separation module. The mechanical coal breaking module includes: a drill pipe rotating device, a drill pipe, and a reamer bit, sequentially connected to perform rotary cutting, drilling and slotting operations on a coal seam in a borehole. The air lift reverse circulation module includes: an air compressor and a dual-wall drill pipe. The air compressor is configured to transport a coal-air-water mixture through an inner pipeline of the dual-wall drill pipe to the coal-air-water separation module. The jet coal breaking module includes: the drill pipe rotating device, a fracturing truck, the drill pipe, and a jet tool string, sequentially connected to mine the coal seam.

The invention relates to the technical field of deep well drilling, in particular to a deep well drilling anti-jamming buffer device which comprises a first connecting piece, a threaded groove is formed in the upper portion in the first connecting piece, a first through hole is formed in the first connecting piece, and a limiting block is installed on the lower portion of the first connecting piece. The second connecting piece is connected to the lower portion of the first connecting piece in a sliding mode, a threaded groove is formed in the middle of the second connecting piece, the shielding piece is installed on the second connecting piece, and the disc spring is installed between the second connecting piece and the first connecting piece. Through the synergistic effect of the disc spring set and the damper, nonlinear absorption of axial impact energy is achieved, radial self-adaptive aligning of the ball assembly is matched, the multidirectional load of the drill rod in a complex stratum and the gap adjusting function of the inclined face of the shielding piece and the reamer are effectively balanced, mud pressure distribution can be dynamically optimized, and the drilling efficiency is improved. And through combination of reaming cutting and ball resistance reduction, an axial-radial composite jam releasing mechanism is formed, and the probability of jamming of the drill is remarkably reduced.

The invention relates to the field of airflow pipe chambering, and discloses an automobile airflow pipe chambering device which comprises a workbench and a support, a shaping structure is arranged on the left side of the upper surface of the workbench, a movable chambering structure is arranged on the right side of the upper surface of the workbench, and a movable clamping structure is arranged in the middle of the workbench. The transmission structure drives the movable reaming structure and the movable clamping structure to synchronously move in the opposite directions, when the movable reaming structure and the movable clamping structure move in the direction close to each other, the airflow pipe can be reamed, the heating structure is matched to heat the reaming position of the airflow pipe, the reaming speed is increased, and after reaming, the reaming efficiency is improved. The reaming position of the airflow pipe can be shaped through the shaping structure, the problem that the airflow pipe shrinks due to gradual cooling after being heated and reamed is solved, in the shaping process, the movable reaming structure and the movable clamping structure are reset, reaming work can be continuously conducted on the next airflow pipe, the working time is fully utilized, and the working efficiency is improved. And the working efficiency is improved.