172results about "Drilling drives" patented technology

The invention belongs to the technical field of coal mine safety, and relates to drilling construction equipment with drilling cooperating with reciprocating impact and a coal seam gas extraction method. The impact fracturing assembly comprises an impact drill bit, a reciprocating impact rod and a rotary transmission rod; the middle of the reciprocating impact rod is slidably sleeved with a first positioning block. The reciprocating impact rod is provided with a straight groove arranged in the axial direction, and the straight groove is matched with a linear protrusion in the first positioning block. A movable block is fixedly arranged at the other end of the reciprocating impact rod, one side of the movable block is attached to the inner wall of a groove in the end drill rod, and the other side of the movable block is attached to an annular double-arrow-shaped groove formed in the rotation transmission rod. The rotation transmission rod is axially limited through a second positioning block arranged on the rotation transmission rod in a sleeving mode. One end of the spiral drill rod is connected with the end drill rod, and a universal coupling is movably arranged in the spiral drill rod; the other end of the rotary transmission rod is connected with one end of a universal coupling, and one end of the universal coupling is detachably connected with a tail connector through the tail end of a spiral drill rod.

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 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 invention provides an impact rotary drilling hydraulic control system of a dinting machine, which belongs to the technical field of hydraulic control systems and comprises a variable pump, a pilot oil source control valve group, a proportional multi-way valve, a shuttle valve I, a one-way pressure reducing valve, a shuttle valve II, a drilling machine pilot handle group, an impact rotary drilling machine, a bidirectional hydraulic lock and a drilling machine feeding oil cylinder. According to the hydraulic control system for percussive rotary drilling of the dinting machine, the percussive rotary drilling machine can perform stepless speed regulation between two speeds, high-frequency percussive or low-frequency percussive operation can be flexibly used according to rock stratum and geological working conditions, the application range of equipment is greatly widened, and the hydraulic control system can be used for rock stratums with high hardness, weathered rock stratums and hard and brittle geology. And during low-frequency impact operation, one-key linkage operation can be realized, namely, the functions of feeding, rotating and impacting of the drilling machine can be completed by operating the impact pilot handle.

The invention discloses a highway bridge construction drilling platform which comprises a drilling platform body fixedly installed at the tail end of an engineering vehicle, an inverted-L-shaped frame, a lifting plate, a spiral drill rod and other key components, a knocking mechanism is arranged on the lifting plate, and the spiral drill rod is driven to do lifting reciprocating motion through transmission of a cylindrical sleeve, an inclined circular plate, an arc-shaped sliding block and a gear; and the platform is further provided with an adjusting mechanism, the drilling depth of the spiral drilling rod is accurately controlled through threaded connection matching of a threaded rod and a threaded sleeve block, and the drilling precision is enhanced. The dust falling mechanism atomizes and sprays a water source to a drilling hole through cooperation of a piston plate, a pull rod and a one-way valve, dust falling is achieved, a third gear at the bottom end of a fixing ring drives a bulldozing plate to conduct circular motion, crushed soil at the drilling hole is moved and transported, and drilling hole backfilling is prevented. And efficient, accurate and environment-friendly highway bridge construction drilling operation is achieved.

The present invention discloses a fully hydraulic power head drill suitable for drilling in loose and broken strata. It includes a chassis assembly, a centering gripper, a pipe ramming machine, a power head, a drill rig guide rail, a fixed pulley block, a support oil cylinder and a feed oil cylinder; the power head is fixedly connected to the feed oil cylinder and is slidably connected to the drill rig guide rail; the drill rig guide rail is installed on the chassis assembly; the fixed pulley block is fixed at the top of the drill rig guide rail to change the direction of the wire rope and form a traction mechanism in cooperation with the winch on the drill rig, and when necessary, pull the power head and the drill pipe string to the starting position; the support oil cylinder and the feed oil cylinder are hinged and fixed on the chassis assembly. The present invention has the advantages of realizing the rotary feed function of an ordinary core drill while realizing impact rotary compound drilling and improving the working efficiency of pipe ramming drilling.

The invention relates to the field of drilling devices, in particular to a bridge pile foundation drilling device which comprises a supporting chassis and a supporting frame. A controllable rotary drill unit; the compression locking units are symmetrically arranged on the outer side of the supporting chassis, fixedly connected with the supporting chassis and connected with the controllable rotary drill unit; the synchronous cleaning unit is arranged on the outer side of the controllable rotary drill unit and connected with the supporting chassis; the impact stone breaking unit is arranged on the inner side of the controllable rotary drilling unit; wherein the controllable rotary drilling unit comprises an automatic rotary drilling assembly, a torque control assembly and an induction type regulation and control assembly, by arranging the controllable rotary drilling unit, rotation and lifting of a drilling rod can be synchronously achieved, hard rocks or other soil layers with high hardness in the drilling process are subjected to impact crushing, and the drilling efficiency is improved. And the torque of the drill rod is adjusted, so that the equipment can drill through soil layers with different hardness.

The utility model discloses a direct impact type hydraulic rock drill which comprises a machine body composed of a machine tail portion, a cylinder body portion, a gear box portion and a machine head portion, the machine tail portion and the cylinder body portion jointly form an impact assembly, and the gear box portion comprises a rotation assembly. A first cavity for accommodating an impact piston is formed in the impact assembly; the rotary assembly and the machine head part jointly form a second cavity for accommodating the bit shank, and the first cavity is communicated with the second cavity; the impact piston is provided with a center hole. The bit shank is provided with a flushing cavity. One end of the water needle is fixed to the machine tail part, a pipe body of the water needle penetrates through a center hole of the impact piston, extends into the bit shank and is communicated with the flushing cavity, a water inlet cavity isolated from the first cavity is formed in the machine tail part, and the water inlet cavity is communicated with the water needle; and a water inlet communicated with the water inlet cavity is formed in the machine tail part and used for introducing flushing water into the water inlet cavity and the water needle so as to cool the impact piston and the bit shank and flush the bit shank.

The utility model relates to a raking pile rock-socketed percussion drill hole-forming barrel drill bit, which belongs to the technical field of barrel drill bits, and comprises a rock percussion drill hole-forming barrel drill bit body, a rotary drilling machine, a connecting shaft, a flange plate and a bolt, and a reinforcing mechanism is arranged at the top of the rock percussion drill hole-forming barrel drill bit body. The reinforcing mechanism comprises a reinforcing sleeve fixedly installed on the peripheral wall of the connecting shaft. According to the raking pile rock-socketed percussion drill hole-forming barrel drill bit, the overall compressive strength of a connecting shaft is enhanced through the effect of a reinforcing sleeve, a connecting plate is fixed through the effect of an arc-shaped mounting base and a screw, and meanwhile an arc-shaped supporting plate is mounted in the reinforcing sleeve; part of pressure is shared to the rotary drilling machine under the action of the arc-shaped supporting plate, the supporting rod and the connecting plate, the influence of gravity and pressure on the connecting shaft when the drill bit body of the rock impact drill hole-forming barrel drill inclines is reduced, and therefore the service life of the connecting shaft is prolonged, and the stability of the connecting shaft is improved.

The invention discloses a vibration short section and an underground electric control rotary percussion rope sampler, and relates to the technical field of drilling engineering coring tools, and the vibration short section comprises a vibration short section body; the vibration nipple body comprises a lower cylinder, a control cylinder, a vibration cylinder and a guide cylinder which are sequentially connected through threads. The end surface of the lower cylinder is a hammering surface; a battery pack and a control module are mounted in the control cylinder; two electromagnets are fixed in the vibrating cylinder and are controlled by a battery pack and a control module, a retainer slidably connected in the vibrating cylinder is arranged between the two electromagnets, a permanent magnet is mounted on the retainer, two ends of the retainer slidably penetrate out of the two electromagnets respectively, and one end, penetrating into the control cylinder, of the retainer is in threaded connection with a vibrating hammer; and the vibration hammer is used for striking the hammering surface. The underground electric control rotary percussion rope sampler is provided with a vibration short section, and further comprises a spearhead, a hanging short section, a connecting short section, a sampling pipe and a drill bit. Through the interaction of the electromagnet and the permanent magnet, stable impact force can be generated, and the drilling efficiency is effectively improved.

An air motor apparatus for air drilling includes a filter assembly at an uphole end that receives compressed air and diverts a constant pressure portion through a filter to a vane motor and a remaining portion to an air hammer at a downhole end via bypass conduits. The apparatus includes one or more sensors for measuring drilling conditions, the sensors being connected to a communication device capable of transmitting the sensor data to the surface. The sensors and their wiring are shielded from high air speeds by bypass conduits and components of the filter assembly.

An air motor apparatus for air drilling includes a filter assembly at an uphole end that receives compressed air and diverts a constant pressure portion through a filter to a vane motor and a remaining portion to an air hammer at a downhole end via bypass conduits. The apparatus includes one or more sensors for measuring drilling conditions, the sensors being connected to a communication device capable of transmitting the sensor data to the surface. The sensors and their wiring are shielded from high air speeds by bypass conduits and components of the filter assembly.

The invention relates to the technical field of mineral drilling, in particular to intelligent drilling equipment for coal mine tunneling operation, which comprises a drilling platform, a drilling mechanism, an impact mechanism, a torque increasing mechanism and a guide mechanism, the drilling mechanism is fixedly arranged at one end of the top of the drilling platform, and the impact mechanism is fixedly arranged at one end, far away from the drilling mechanism, of the top of the drilling platform; the torque increasing mechanism is fixedly arranged at the top of the drilling platform and located between the drilling mechanism and the impact mechanism. Through the arrangement of the impact mechanism and the torque increasing mechanism, impact force can be provided for the spline shaft, the drilling efficiency is improved, meanwhile, after the impact hammer is meshed with the impact seat, torque force is generated on the impact seat, the torque force is further transmitted to the spline shaft and the drilling rod through the impact seat, and therefore the drilling rod is helped to get out of trouble, and the problem that the drilling rod is locked is solved.

The invention relates to the technical field of deep space detection equipment, in particular to an extraterrestrial celestial body rock coring drill and a coring and breaking method thereof. The coring drill comprises an attachment mechanism, a rotary impact sliding table mechanism and a coring and core breaking mechanism which are sequentially connected, the attachment mechanism is used for being anchored to the surface of celestial rock, and the rotary impact sliding table mechanism is used for providing drilling rotation, impact power and axial feeding motion; the coring and breaking mechanism comprises an outer drill bushing, an eccentric coring pipe assembly mounted in the outer drill bushing and a drill bit connected to the front end of the outer drill bushing; the eccentric coring pipe assembly comprises a coring pipe and a driving shaft for driving the coring pipe to rotate, and the coring pipe and the driving shaft are eccentrically arranged; the driving shaft can be controlled to synchronously rotate in the same direction with the outer drill bushing or independently rotate in the opposite direction relative to the static outer drill bushing. Active anchoring and multiple buffering are combined, the sample integrity, the operation success rate and the automation degree of extraterrestrial hard rock coring are remarkably improved, and lossless capture and mechanical reliable breaking of a rock core are achieved.

An air motor apparatus for air drilling includes a filter assembly at an uphole end that receives compressed air and diverts a constant pressure portion through a filter to a vane motor and a remaining portion to an air hammer at a downhole end via bypass conduits. The apparatus includes one or more sensors for measuring drilling conditions, the sensors being connected to a communication device capable of transmitting the sensor data to the surface. The sensors and their wiring are shielded from high air speeds by bypass conduits and components of the filter assembly.

The invention relates to the technical field of geological exploration, in particular to a geological exploration sampling device which comprises a supporting frame and a drill rod. The device is characterized in that a motor is fixed to the top of the supporting frame, a main shaft is fixed to the output end of the motor, the main shaft penetrates through the top of the supporting frame and is rotationally connected with the top of the supporting frame, the lower end of the main shaft extends into the drill rod and is connected with the drill rod through a transmission mechanism, and a supporting plate is arranged outside the drill rod and rotationally connected with the drill rod; wherein an impact mechanism is arranged above the supporting plate, when the motor drives the main shaft to rotate, on one hand, the main shaft drives the drill rod to rotate through the transmission mechanism, and on the other hand, the main shaft continuously impacts the supporting plate through the impact mechanism, so that the supporting plate drives the drill rod to move downwards; according to the device, a large impact force can be exerted on the drill rod, so that the drill rod can rapidly crush the stratum, the drilling speed can be remarkably increased in cooperation with rotation of the drill rod, and then the exploration sampling efficiency is improved.

A rotating sleeve (17), a rock drill (6), and a method for manufacturing the rotating sleeve. The rotating sleeve is mountable around a shank adapter (8) of the rock drill and includes several internal teeth (22) with opposing first and second flank surfaces (32, 33) for transmitting rotation to the shank adapter (8). The internal teeth are provided with end reliefs (38, 39) including chamfers between the flank surfaces and end faces (34) of the teeth.

The embodiment of the application provides a square drill hole pile hole forming equipment and method, wherein the equipment comprises a drilling machine shell, a central shaft drill rod is vertically arranged in the drilling machine shell, a rotating driving device is connected to the top end of the central shaft drill rod, a rotary excavator drill bit is connected to the bottom end of the central shaft drill rod, helical blades are fixed to the outer wall of the central shaft drill rod, the rotating driving device drives the central shaft drill rod, drives the rotary excavator drill bit to rotate and drill to form a circular hole, an impact driving device is arranged at the bottom of the drilling machine shell, four impact drill bits are connected to the output end of the impact driving device, the impact drill bits are arranged at the four corners of the bottom periphery of the rotary excavator drill bit, the impact drill bits vertically move up and down, reciprocating rock breaking is realized, the circular hole is reamed, and finally a square hole is formed. The application can realize full-automatic mechanical drilling, realize square hole forming at one time, has wide application range, small environmental pollution and low overall equipment cost.

A system for imparting reciprocating vertical movement to a well pipe assembly includes a top head drilling unit having a drilling head configured to attach to an adapter. The adapter includes a top shaft threadably engaged with the drilling head. A right angle gear box includes an input gear, a first output gear, and a second output gear. The input gear is coupled to the top shaft and driven by rotational movement of the drilling head imparted on the top shaft. The output gears are engaged by the input gear. A pair of linkage arms are coupled to the output gears by a first output shaft and a second output shaft. The output shafts impart rotation about a horizontal axis to the pair of linkage arms. A support extends between the pair of linkage arms and is configured to move a plunger vertically with the pair of linkage arms.

A hydraulic rock breaking machine and an apparatus and method for monitoring operation of same. The apparatus comprises at least one pneumatic sensor (S) for monitoring an inner space of the machine (10) and at least one control unit (CU) configured to receive and process the pneumatic sensing data.

The application provides a hydraulic control system for impact rotary drilling of a bedding machine, and belongs to the technical field of hydraulic control systems, and comprises a variable pump, a pilot oil source control valve group, a proportional multi-way valve, a shuttle valve I, a one-way pressure reducing valve, a shuttle valve II, a drilling machine pilot handle group, an impact rotary drilling machine, a bidirectional hydraulic lock and a drilling machine feeding oil cylinder. Through the hydraulic control system for impact rotary drilling of the bedding machine, the impact rotary drilling machine can be infinitely adjusted between double speeds, high-frequency impact or low-frequency impact operation can be flexibly used according to rock strata and geological conditions, the use range of the equipment is greatly improved, and the hydraulic control system can be used for high-hardness rock strata, weathered rock strata and hard and brittle geology. When low-frequency impact operation is performed, one-key linkage operation can be realized, that is, the drilling machine feeding, rotation and impact functions can be completed by operating the impact pilot handle.

The application discloses a high-efficiency rock breaking drill bit based on torsional impact, and belongs to the technical field of rock breaking tools. The high-efficiency rock breaking drill bit comprises a supporting shell, the inside of the supporting shell is fixedly connected with a mounting base plate, and one side of the mounting base plate is fixedly connected with a servo motor. The application is provided with a gas cleaning assembly, which is connected with a reciprocating push rod and comprises a connecting baffle, a piston sleeve, a piston rod, a piston plate, an air inlet pipe, an air inlet check valve, an air outlet pipe and an air outlet check valve. The gas compression and discharge are driven by the reciprocating movement of the impact mechanism, intermittent air blowing and cleaning are realized on one side of the broken drill bit, the reciprocating impact movement and the gas cleaning function are coupled through structural design, the cleaning operation can be realized by the kinetic energy of the impact mechanism itself, an independent cleaning power source does not need to be additionally arranged, the system redundancy is reduced, the rock debris is effectively removed through the intermittence of the reciprocating movement, the friction and wear are reduced, and the state of the drill bit continuously and efficiently breaking rocks is maintained.

The invention discloses a guide rail type rock drill for frozen bed rock construction, and relates to the technical field of guide rail type rock drills, the guide rail type rock drill comprises a working vehicle, a fixed guide rail, a drill rod and a first fixing sleeve, the fixed guide rail and the first fixing sleeve are installed above the working vehicle, and the drill rod is arranged in the fixed guide rail and the first fixing sleeve; the fixed guide rail is used for driving the drill rod to rotate and meanwhile stretches out and draws back in the axis direction of the drill rod. The planet wheels rotate around the axis of the drill rod and rotate around the respective axes at the same time, it is ensured that the drill rod does not deviate during drilling in the later period, positioning is accurate, slipping of the drill rod is reduced, the drill rod does not slip, positioning is accurate, the drill rods supplement each other, and the breaking drill bit can be repeatedly stretched out and drawn back under the action of the telescopic spring; and when the crushing drill bit goes deep into the drilling limit, the drill rod continues drilling, and the crushing drill bit stops rotating.

The invention relates to the field of drilling, in particular to a coal face drilling device and method.The lower end of a drill rod is fixedly provided with a drill bit, the drill bit is internally provided with a high-pressure water chamber, the outer wall of the drill bit is provided with injection holes communicating with the bottom of the high-pressure water chamber, the drill rod is internally provided with a liquid inlet channel, and a vertically-extending transmission shaft is rotationally installed in the high-pressure water chamber; a water wheel is fixedly installed at the upper end of the transmission shaft, a movable column is vertically and slidably installed on the bottom wall of the driving cavity, the lower end of the movable column extends out of the drill bit and is provided with a hammer head, a transmission component connected with the transmission shaft and the movable column is arranged in the driving cavity, and the transmission shaft drives the movable column to vertically reciprocate through the transmission component when rotating; when the drill bit drills, high-pressure water is injected into the high-pressure water chamber through the liquid inlet channel, the water wheel is impacted by the high-pressure water and drives the transmission shaft to rotate, the curve groove in the cylindrical cam acts on the sliding pin and drives the sleeve to vertically move in a reciprocating mode, and the sleeve drives the hammer head to vertically move in a reciprocating mode through the movable column to continuously impact a coal seam.

The present application relates to a kind of multi-dimensional composite impactors for drilling, comprising: transmission stub; Tool housing, lower end is fixedly connected with transmission stub, tool housing has flow passage in it;Torsional impact component, it is located in the lower part of tool housing and includes pressure disc, center shaft fixed plate, hammer housing, center shaft, impeller, valve plate and hydraulic hammer;Axial impact component, it is located in the upper part of tool housing and is fixedly connected with torsional impact component by pressure disc, axial impact component includes shunt, nozzle, nozzle seat, hammer outer sleeve, valve sleeve, piston and impact hammer. By the multi-dimensional composite impactor of the present application, the rate of penetration of deep well ultra-deep well can be improved and the damage of stick-slip vibration to the drill string system can be reduced, the multi-dimensional composite impactor of the present application drives the movement of parts using drilling fluid, generates impact force in axial and torsional directions, thereby applying high-frequency axial-torsional coupled impact to the drill bit, improving rock breaking efficiency of the drill bit under impact load.

The invention provides a hole bottom rock breaking device applied to extraterrestrial celestial body deep drilling. The hole bottom rock breaking device comprises an ultrasonic generator, a cable, an electric slip ring, an ultrasonic transducer, a free mass block, a spiral drill rod and a drill bit. The ultrasonic generator generates ultrasonic energy and provides the ultrasonic energy to the ultrasonic transducer; the ultrasonic transducer is used for converting an input ultrahigh-frequency electric signal into ultrahigh-frequency mechanical vibration; the free mass block excites the ultrahigh-frequency ultrasonic vibration generated by the ultrasonic transducer to drive downwards to generate high-frequency collision with the spiral drill rod, so that the spiral drill rod and the drill bit move downwards to impact the rock, and the free mass block performs reciprocating high-frequency collision between the ultrasonic transducer and the spiral drill rod through reverse movement of impact counterforce; the spiral drill rod is connected with the bottom of the ultrasonic transducer, and energy generated by ultrahigh-frequency vibration of the ultrasonic transducer and high-frequency impact of the free mass block is transmitted downwards to the drill bit. And the drill bit acts the high-frequency-ultrahigh-frequency impact energy on the rock, and the rock is broken through continuous impact.

A rotating sleeve (17), a rock drilling rig (6) and a method of manufacturing a rotating sleeve. The invention relates to a rotary sleeve mountable around a shank adapter (8) of a rock drilling machine and comprising a number of internal teeth (22) provided with opposing first (32) and second (33) tooth side surfaces for transmitting rotation to the shank adapter. The internal tooth is provided with an end decompression portion (38, 39) comprising a diagonal plane between a tooth side surface and an end surface (34) of the tooth.

The invention belongs to the technical field of coal mine drilling, and particularly relates to drilling equipment and method for underground coal mine geological prospecting. The drilling equipment comprises a driving assembly, a console body is arranged on the driving assembly, a plurality of fixing assemblies are arranged below the driving assembly in an array mode, and a punching assembly is arranged on the driving assembly; the driving assembly comprises two bases, a plurality of fixing columns are fixedly connected to the upper end of the lower base in an array mode, and first electric telescopic rods are fixedly connected to the lower ends of the fixing columns. The pressure control assembly and the console are arranged, hydraulic oil flow division and pressure relief are achieved by adjusting the position of the sealing cover, sparks caused by too large impact force during hard rock stratum operation are avoided, and the underground anti-explosion requirement is met; the console monitors the moving speed of the drilling head in real time and intelligently adjusts the rotating speed of the motor and the telescopic mode of the hydraulic oil telescopic rod; a drilling head is protected in a low-speed and reciprocating impact mode in a hard rock stratum, efficient drilling is kept in a soft rock stratum, and different geological conditions are adapted.

The invention relates to a flushing assembly which comprises a machine head, a flushing head arranged in the machine head, a bit shank copper sleeve arranged on the rear side of the tail of the flushing head and a machine head copper sleeve arranged on the front side of the head of the flushing head, and a bit shank is arranged in the machine head and sequentially penetrates through the bit shank copper sleeve, the flushing head and the machine head copper sleeve. The bit shank copper sleeve and the machine head copper sleeve are used for preventing radial deviation of the bit shank, a cavity is formed between the flushing head and the bit shank, the head and the tail of the flushing head are respectively provided with a U-shaped seal, a center hole extending towards the head of the bit shank is formed in a front-section rod body of the bit shank, the cavity is communicated with the center hole, and a flushing medium connector for providing flushing media for the cavity is formed in the machine head. The bit shank copper sleeve and the machine head copper sleeve are arranged in the machine head, radial deviation of the bit shank is prevented through the guiding effect of the bit shank copper sleeve and the machine head copper sleeve, the stability of the bit shank is improved, and meanwhile the service life of the bit shank is guaranteed.