1451results about "Chucks" patented technology

The invention discloses an integrated machining device suitable for a large marine propeller, which comprises a machining adjusting assembly, the machining adjusting assembly is composed of an X-axis moving mechanism, a Y-axis moving mechanism and a Z-axis moving mechanism, one side of the Z-axis moving mechanism is fixedly provided with a rotating mechanism, one end of the rotating mechanism is fixedly connected with a cutting assembly, and the other end of the rotating mechanism is fixedly connected with a cutter; according to the large marine propeller integrated machining device with the automatic machining function and the self-adaptive clamping function, through the integrated multi-axis linkage machining adjusting assembly and the three-dimensional scanner, automatic path planning can be conducted, and automatic operation is achieved; therefore, the dependence on advanced technicians is greatly reduced, the machining efficiency and the product consistency are remarkably improved, and meanwhile, through the collaborative design of the rotatable three-jaw chuck and the center supporting mechanism, simultaneous reliable supporting from the interior and the exterior of the workpiece can be automatically achieved during clamping.

The invention belongs to the technical field of inner star wheel clamps, and particularly relates to an inner star wheel quick-change high-precision clamp which comprises a clamping shell, a clamping component is arranged in the clamping shell, the clamping component comprises a quick-change clamping block, and the quick-change clamping block clamps an inner star wheel. According to the quick-change high-precision clamp for the inner star wheel, the clamping component and the driving component are arranged, a chute is in inclined sliding fit with an inclined rod, and a pushing taper sleeve drives the conical surface of a roller on an inserting rod, so that the single axial movement of a driving hydraulic cylinder is creatively changed into the single axial movement of the driving hydraulic cylinder; according to the three-jaw chuck, the three clamping jaws are synchronously decomposed and converted into the composite motion of radial shrinkage and axial compression of the three clamping jaws, and the structure enables the clamp to actively and reliably restrain the axial degree of freedom of a workpiece while clamping the outer circle of the workpiece, so that the defect that the axial constraint of a traditional three-jaw chuck is weak is overcome. The method has the following direct effects: firstly, a machine tool is allowed to process by adopting larger cutting depth and feed rate, so that the processing efficiency is obviously improved, and the service life of a cutter is prolonged;

The invention relates to the technical field of automobile part manufacturing, discloses an adjustable multi-angle trimming and deburring device for automobile part machining, and provides a scheme that a trimming machine tool is matched with a multi-angle trimming mechanism to solve the problems that in the prior art, the clearing efficiency of flashes and burrs at a center hole and a heat dissipation groove of a brake disc is low, and positioning is not accurate. According to the device, a four-jaw chuck is driven by a driving motor to rotate a brake disc, a ball screw, a movable block, a connecting rod and other assemblies are utilized, four sets of trimming cutters synchronously trim a center hole, the inner side, the outer side and the bottom face corners of a heat dissipation groove correspondingly, a buffering inserting rod and a spring are combined to absorb impact, and precise operation of the cutters is guaranteed through the design of a deflection rotating shaft, a magnet and the like. According to the scheme, burrs at multiple positions are cleaned at a time, clamping errors are eliminated, energy consumption and cutter abrasion are reduced, the structure is compact, the device is suitable for automatic trimming of brake discs of different sizes, and the machining efficiency and precision are remarkably improved.

An element changer includes a plurality of operation pin members (4) inserted in a housing (3). Each of the operation pin members (4) has a wedge surface (12c). When the operation pin members (4) are pushed into the housing (3), each wedge surface (12c) is disengaged from an engaging portion (10a) provided at a leading end portion of a tubular wall portion (10) of a tool plate (2) or of a connection plate (1). This allows a tool (5) functioning as a second element to be detached from a robot arm (8) functioning as a first element.

The invention relates to a rearview mirror large-diameter mirror rod outer circle turning and thread rolling full-automatic machining all-in-one machine which comprises a rack, a material pushing mechanism, an outer circle turning mechanism, a transmission mechanism and a thread rolling mechanism, the rack is provided with two material stacking areas arranged side by side, and the material pushing mechanism pushes two raw material rods into the outer circle turning mechanism; the outer circle turning mechanism comprises a driving assembly, a first seat body, a second seat body, two hollow chucks, a turning tool assembly and a first driving part, the first seat body is fixedly arranged on the rack, the second seat body is located on the side, away from the push rod, of the first seat body, and the two hollow chucks are rotationally connected to the two seat bodies correspondingly; the turning tool assembly is arranged between the first seat body and the second seat body; the transmission mechanism is located between the second base body and the thread rolling mechanism, and the two raw material rods are conveyed to a feeding opening of the thread rolling mechanism in the same direction. The material pushing mechanism can push the two raw material rods to enter the outer circle turning mechanism at the same time, two machining devices do not need to be arranged side by side, and the machining speed of a follow-up thread rolling machine is better matched.

The invention discloses a horizontal lathe for finish machining of a workpiece, and relates to the field of lathes, the horizontal lathe comprises a lathe body, a spindle box, chucks, a tool rest, a second electric push rod, a cooling chip removal assembly and an annular workpiece, the number of the chucks is two, the chucks are installed on the left side and the right side of the interior of the lathe body respectively, and the chuck on the left side is fixedly connected with an output shaft of the spindle box; the spindle box is fixedly installed on the left side of the inner wall of the lathe bed. Through cooperation of the annular workpiece, the chuck, the chuck jaws, the adjusting assembly and the driving motor, the chuck jaw adjusting effect in three directions is achieved through the arrangement of the adjusting assembly, the chuck adopts a three-jaw self-centering mode, the chuck rapidly and firmly clamps the annular workpiece, the chuck jaws are subjected to precise grinding, and the machining precision is improved. The clamping face is attached to the outer circle or the inner hole of the circular-ring-shaped workpiece, the chuck jaw is used for meeting the requirements of different circular-ring-shaped workpieces, automatic alignment and clamping are achieved, manual alignment errors are reduced, the coaxiality of the clamped circular-ring-shaped workpieces is guaranteed, and the clamping device is a core part for positioning and machining the circular-ring-shaped workpieces.

The invention discloses rotary clamping equipment for a medium-caliber seamless steel pipe for fluid conveying and a using method, and relates to the technical field of steel pipe machining. The rotary clamping equipment for the seamless steel pipe for conveying the medium-caliber fluid comprises a rack, a steel pipe, a machine box and a supporting frame, and further comprises a chuck assembly which is coaxially and rotatably installed on the machine box and the supporting frame and used for fixing the two ends of the steel pipe. The double-row cylindrical self-aligning bearing is used for supporting the main shaft sleeve, passive self-adaptive self-aligning of the main shaft sleeve is achieved, a chuck assembly at the driving end can follow the instantaneous rotation axis of actual bending change of a steel pipe in real time, and a workpiece is not forced to conform to the theoretical axis of equipment; the problems of spiral line contact between the clamping jaw and the surface of the steel pipe, local stress concentration and periodic pulsation attenuation of clamping force caused by forced centering under traditional rigid clamping are solved, it is guaranteed from the source that the clamping jaw and the outer edge of the steel pipe always keep stable and uniform surface contact in the initial clamping stage and the rotating process, and axial movement is eliminated.

The lathe comprises a lathe body, a guide rail, a rotating chuck and a movable base, a material changing device is arranged on one side of the lathe body and comprises a containing frame, a lifting frame and a material changing frame, a material preparing station is arranged in the containing frame, and the lifting frame and the material changing frame are driven by a lifting air cylinder and a telescopic air cylinder correspondingly; a feeding groove and a discharging groove are formed in the end, close to the lathe body, of the material changing frame, an advancing groove matched with the material preparing station is formed in the top of the material changing frame, and an ejection block driven by an ejection spring is arranged in the center of the rotating chuck. Meanwhile, the machined cam shaft is ejected out of the chuck and is received by the discharging groove, and automatic exchange of new and old workpieces is achieved. Automatic and continuous feeding and discharging of camshaft machining are achieved, the waiting time of a machine tool is remarkably shortened, and the machining efficiency and the equipment utilization rate are improved.

The invention is suitable for the technical field of valve element machining, and provides a valve element machining machine tool which comprises a rack and a cutting part arranged on the rack in a sliding mode. The rack comprises a conical disc; supporting plates are fixed to the surfaces of the conical discs. A clamping part used for clamping a valve element blank is rotationally arranged on the side face of the supporting plate in a penetrating mode. A sliding frame in sliding fit with the cutting part is fixedly mounted at the top of the supporting plate; two groups of stopping parts matched with the cutting parts are arranged on the sliding frame in a sliding manner; insertion rods matched with the sliding frames in an inserted mode penetrate through the side faces of the vertical plates in a sliding mode. According to the device, in the feeding process of the cutter, through linkage cooperation of all the components, dynamic limiting of a valve element blank in the axial direction of the valve element blank is achieved, deviation of the blank is avoided, deviation and dislocation of the valve element blank caused in the cutter feeding process are avoided, the clamping stability of the valve element blank is improved, and the working efficiency is improved. And the machining quality of the valve element blank is further improved.

The invention relates to the technical field of combined machining, and discloses a five-axis five-linkage turning, milling and drilling combined machining center which comprises an equipment box, a mounting frame is mounted on the rear side of the inner wall of the bottom end of the equipment box, an automatic tool changing system is arranged on the left side of the mounting frame, and a transmission system is arranged in the middle of the mounting frame. A feeding table is slidably mounted on the front side of the inner wall of the bottom of the equipment box through sliding rails. The five-axis five-linkage turning, milling and drilling combined machining center can effectively solve the problems that in the prior art, a five-axis turning, milling and drilling combined machining center mostly adopts the mode that two sets of clamps are matched, parts need to be repeatedly clamped in the machining mode, the machining period of a single piece is directly prolonged through repeated positioning operation, and machining efficiency is high. The clamping precision and the consistency of the two sets of clamps cannot be guaranteed; in the prior art, a worker needs to stretch the upper body into a closed machining area of equipment and manually righting a part to enable the part to be aligned to a clamping hole position and keep a horizontal state, and the process is tedious in operation steps and has safety risks.

The invention relates to the technical field of clamping tools, in particular to a clamping device for a cylindrical thin-wall precision component, which comprises a supporting unit, a bracket, a positioning unit, a positioning mechanism arranged in the bracket, a clamping unit and a clamping mechanism arranged on the positioning mechanism, the inflating mechanism is arranged on the clamping mechanism and is used for preventing the part from being clamped and deformed; balance of deformation prevention and stable clamping is achieved through flexible contact and self-adaptive air pressure adjustment, an elastic cushion and an air inflation bag cushion are arranged in the clamping mechanism, a self-adaptive adjusting structure is formed by matching with an air inflation mechanism, it is guaranteed that the static friction force is enough to prevent parts from sliding, and the clamping effect is good. According to the clamping device, the clamping force is reduced, sinking, ovality out-of-tolerance or inner wall plastic deformation caused by too large clamping force are avoided, the problems of deformation and the like of components in the machining and clamping process can be effectively avoided, the product rejection rate is further reduced, and the actual machining efficiency is further improved.

The invention discloses a stable grating structure which comprises a plurality of grating plates which are arranged in parallel at equal intervals and a plurality of grating ribs which are arranged in parallel at equal intervals, and the grating plates and the grating ribs are vertically staggered to form a grid-shaped stable grating body. The staggered positions of any grating plate and any grating rib are connected in a welded mode. A plurality of rib clamping grooves are formed in the upper side of the grating plate in the length direction in an array mode. The grille ribs are clamped in the rib clamping grooves, and the grille ribs are connected with the edge contours of the lower ends of the rib clamping grooves through welding; a grating plate passage is formed between any two adjacent grating plates; automatic dynamic sequential welding is achieved, and meanwhile the assembling process and the welding process of the grating structure are synchronously implemented.

The invention discloses a numerical control vertical lathe with a detachable clamping mechanism, and relates to the technical field of machining, the numerical control vertical lathe comprises a turning frame, a first electric guide rail, a second electric guide rail and a machining table, the first electric guide rail and the second electric guide rail are used for controlling the turning frame to move, and the machining table is used for bearing a workpiece; the lathe turntable is driven after being decelerated by a motor through a speed reducer, a workpiece chuck is clamped to the top of the lathe turntable and used for off-line centering adjustment of workpieces, worm calipers are arranged at the top of the workpiece chuck and used for clamping the workpieces, and an air pressure locking device and a magnetic floating positioning device are arranged on the lathe turntable. The pneumatic locking device is used for locking the lathe turntable and the workpiece chuck, and the magnetic floating positioning device is used for positioning and guiding the lathe turntable and the workpiece chuck. Workpiece centering operation which consumes long time is completed off line, the machine tool shutdown clamping time is greatly shortened, and the equipment utilization rate is increased.

The invention relates to the technical field of clamps, and discloses a crankshaft turning special tool which comprises a chuck base, the chuck base comprises a mounting face and a working face, a counterweight assembly, a movable clamping assembly and a fixing piece are arranged on the working face of the chuck base, and the counterweight assembly and the fixing piece are detachably arranged on the chuck base. The movable clamping assembly comprises two movable clamping blocks which are symmetrically arranged, the two movable clamping blocks are movably arranged on the chuck base, the movable clamping blocks are driven by a driving assembly in the chuck base, and the fixing piece comprises a fixing block and a fixed clamping block installed on the fixing block. According to the eccentric clamping device, eccentric clamping of the crankshaft can be rapidly achieved with high precision.

The invention discloses a boring machining device for light axle housing production. Comprising a vertical main boring machine, two horizontal auxiliary boring machines, an axle housing positioning mechanism arranged on a working table of the vertical main boring machine, a hydraulic chuck I mounted on a main shaft of the vertical main boring machine, a boring cutter I fixed on a movable clamping jaw of the hydraulic chuck I, and a pair of boring cutters II fixed on a disc body of the hydraulic chuck I, the second hydraulic chucks are installed on a main shaft of the horizontal auxiliary boring machine, the third boring cutters are fixed to movable clamping jaws of the second hydraulic chucks, a main shaft box of the vertical main boring machine vertically and linearly moves and drives the first hydraulic chucks to be close to or away from the top of the workbench, the first boring cutter and the two second boring cutters are sequentially arranged from top to bottom, the first boring cutter bores the edge face of a center hole of the axle housing, and the second boring cutter bores the edge face of the center hole of the axle housing. Two boring cutters II bore two inner holes of the axle housing at the same time; a spindle box of the horizontal auxiliary boring machine horizontally and linearly moves and drives a second hydraulic chuck to be close to or away from one side of the workbench, and a third boring cutter bores the end of the axle housing. The axle housing boring machine has the advantage that the effect of efficiently boring the axle housing is achieved.

The invention relates to the technical field of external thread machining, in particular to a steel pipe external thread machining device and a machining method thereof.The steel pipe external thread machining device comprises a conveying support, a conveying mechanism and a machining mechanism, a through groove is formed in the middle of the top end of the conveying support in a penetrating mode, and the conveying mechanism is arranged on the conveying support and used for conveying and supporting a steel pipe; the machining mechanism comprises a clamping moving assembly, a grinding assembly and two fixed supports. The overturning driving cylinder body can be used for driving the driving connecting rod to adjust the height of the overturning support, supporting requirements of steel pipes of different specifications can be flexibly met, the problem that a traditional device is narrow in adaptation range is solved, automatic conveying of the steel pipes can be achieved, manual intervention is reduced, follow-up machining continuity is guaranteed, and therefore the steel pipe machining efficiency is improved, and the production cost is reduced. And automatic machining of the steel pipe can be achieved, noise and vibration in the steel pipe machining process are reduced, thread precision deviation caused by vibration is avoided, and therefore the machining quality is improved.

The invention relates to the technical field of turbine shaft machining, and discloses a turbocharger turbine shaft machining device which comprises a machining bin and further comprises a visual door plate installed at an open hole formed in the front face of the machining bin and used for opening and closing the visual door plate and taking and placing the turbine shaft. The machining table is fixedly connected to the interior of the machining bin and used for machining the turbine shaft; the clamping mechanism is arranged above the machining table and used for clamping the turbine shaft; and the moving mechanism is arranged above the processing table. By arranging the clamping mechanism and adopting the scheme that a conical groove pushes a plurality of sets of push rods and clamping blocks to synchronously and radially move, high-precision automatic centering of the turbine shaft is achieved, it is guaranteed that the rotation center of a workpiece and the machining center strictly coincide, the machining roundness is guaranteed from the source, meanwhile, a first spring provides uniform clamping force, and the machining precision is improved. And deformation or surface damage of the thin-wall part possibly caused by a traditional rigid clamp is avoided, and rigid-flexible precise clamping is achieved.

Provided is technology which enables suitable control of a chuck holding force. In this machine tool comprising a main shaft provided with a chuck for holding a workpiece, when an open / close mechanism has performed a closing operation on the chuck such that the chuck enters a closed state from an open state, a holding force of the chuck on the workpiece in the closed state is acquired on the basis of the magnitude of a difference between a first time taken from when a control unit emits a control signal for the closing operation to the open / close mechanism to when a first sensor detects that the chuck is no longer in the open state, and a second time taken from when the control unit emits a control signal in an open / close mechanism to when a second sensor detects that the chuck has entered the closed state.

The self-adaptive anti-centrifugal chuck comprises a chuck body and clamping jaws, T-shaped sliding blocks matched with T-shaped sliding grooves of the chuck body are machined on the bottom faces of the clamping jaws, threaded holes are formed in the clamping jaws, bearing frames are installed at the two ends of the T-shaped sliding grooves of the chuck body through bolts, and lead screws matched with the threaded holes are installed on the bearing frames through bearings. A notch is formed in one end of the lead screw and used for being driven by a hand or a tool to rotate, a magneto-rheological elastomer layer is arranged on the bottom face of the T-shaped sliding groove, and an embedding groove provided with an electromagnet is formed below the bottom of the chuck. A clamping force sensor is embedded in the clamping face of the clamping jaw, vibration sensors are evenly distributed on the upper surface of the chuck, a piezoelectric ceramic layer is arranged above or below the magnetorheological elastomer layer, the rigidity of the magnetorheological elastomer layer is adjusted through an electromagnet to compensate centrifugal force, the piezoelectric ceramic layer compensates vibration displacement, and the clamping force sensor feeds back clamping force in real time. And self-adaptive centrifugal and vibration interference resistant accurate clamping is achieved.

The invention relates to the related technical field of turning machine tools, in particular to a turning machine tool and a turning method for overflow valve manufacturing, the turning machine tool comprises a cabinet body and an assembly seat fixed in the cabinet body, and further comprises a transverse moving seat movably arranged on the assembly seat, a cutter is installed on the transverse moving seat, the transverse moving seat can be driven by a linear driving module arranged on the assembly seat, and the linear driving module is used for driving the assembly seat to move. The assembling base drives the tool to move towards the workpiece, a chuck used for clamping and fixing the workpiece is arranged on the assembling base, and a rotating shaft fixed to the chuck is further rotationally installed on the assembling base. The cutting fluid pump is provided with the conduction control mechanism, on the basis that the power of the cutting fluid pump is synchronously increased, the conduction control mechanism can increase the conduction amount of the fluid outlet, it is guaranteed that the total amount of cutting fluid is sufficient, and the situation that when only the pump power is increased, although the pressure is high, the area of the fluid outlet is not changed, the flow amplification is limited, and cutting heat increased at the square level at the high rotating speed cannot be absorbed is prevented; and hole walls are easy to deform due to temperature difference.

A deburring tool includes a body including a cylinder chamber having a tool holder holding hole, and an anti-rotation body holding hole; a tool holder having an anti-rotation groove and disposed in the cylinder chamber to reciprocate in the cylinder chamber; a first elastic body disposed inside the cylinder chamber to urge the tool holder toward a distal end; a cover disposed outside the body to reciprocate between a detaching position and a processing position, the cover including, a pressing surface that covers the anti-rotation body holding hole at the processing position, and a relief portion; and an anti-rotation body accommodated in the relief portion when the cover is positioned at the detaching position and the tool holder is pulled from the tool holder holding hole.

The invention relates to the field of machining, and discloses a trailer axle head lightweight machining device which comprises a chuck rotationally mounted on the left side of the inner wall of a base, three sets of moving blocks are slidably mounted on the inner wall of the chuck, and clamping jaws are fixedly mounted on the right sides of the moving blocks; a workpiece is clamped between the multiple sets of clamping jaws, a guide groove is formed in the center of the top of the inner wall of each clamping jaw, a second spring and a connecting column are movably connected into each guide groove in a sleeved mode, and a clamping plate is elastically connected to one end of each connecting column. The transmission liquid is kept to be filled between the adaptive blocks all the time, and when the clamping plate is completely attached to the workpiece, the bolt rotates and abuts against the sealing plate, so that movement of the sealing plate is limited, deformation of the clamping plate is limited, the clamping plate can generate rigid clamping force on the workpiece with a larger contact area, and the clamping effect is improved. And rigid damage to the workpiece in the clamping process of the clamping jaw is avoided.

The invention discloses a turning device for machining machine tool parts, and relates to the technical field of turning devices.The turning device comprises a turning machine tool and a three-jaw chuck installed on the inner side of the turning machine tool, a turning tool rest is installed at the top of the turning machine tool, and a shaft workpiece is clamped on the inner side of the three-jaw chuck; and the auxiliary stabilizer is located on the inner side of the turning machine tool, and the auxiliary stabilizer comprises a notch ring arranged on the outer side of the shaft workpiece. Through the arrangement of the auxiliary stabilizer, during turning, cutting force of a cutter to a shaft workpiece can enable the workpiece to vibrate, the four balls abut against and limit the workpiece in different directions, vibration of the workpiece in the circumferential direction and the axial direction can be effectively restrained, in this way, the turning path of the cutter is more stable and accurate, and the machining precision of the workpiece is improved. And the problems of dimensional deviation and surface roughness caused by vibration can be obviously reduced, so that the dimensional precision and the surface quality of shaft workpieces are improved.

To provide a machine tool and a control method of the machine tool, which automatically adjust a gap between a rotary guide bush and a bar material in the case of a structure in which an opening of the rotary guide bush is adjusted by an adjusting nut and the rotary guide bush synchronously rotates with a front face main spindle.SOLUTION: A rotary guide bush 140 includes an adjusting nut 145 which adjusts a size of a gap by rotating a guide bush body 144 when adjusting a gap between a bar material W and the guide bush body 144 and is screwed with the guide bush body 144. A control device 180 includes a guide bush opening determination section 181b which determines adjustment amount of the gap on the basis of a rotation angle of a front face main spindle 120 when rotating a back face main spindle 160 in a state that the back face main spindle 160 is held by the bar material W and a front face main spindle driving motor 123 is not excited.SELECTED DRAWING: Figure 1

The invention relates to the technical field of tool clamps, and discloses a flexible clamp suitable for large-diameter thin circular ring part machining and a using method.The flexible clamp comprises a flexible clamping jaw, the flexible clamping jaw comprises an assembly frame fixedly connected with a rotary table and provided with a guide rail, and the guide rail is movably connected with two supporting frames capable of moving in the radial direction; the two sets of supporting frames are each provided with a fan-shaped claw with a fan-shaped step, a clamping oil cylinder is arranged between the two sets of supporting frames, locking oil cylinders are arranged on the side walls of the supporting frames, and the locking oil cylinders stretch out to be tightly attached to the assembly frame to achieve locking of the positions of the supporting frames. According to the flexible clamp suitable for machining the large-diameter thin circular ring piece and the using method, nine sets of flexible clamping jaws are evenly distributed on a circular ring belt, clamping is conducted in the radial direction inside and outside, the stress area is increased, deformation is reduced, and the high-precision machining requirement is met; a passive automatic auxiliary supporting technology is adopted, supporting is achieved through opening and closing of the fan-shaped claws, the device adapts to high-precision machining of poor planeness or blank face positioning, and axial deformation and vibration are avoided.

The invention belongs to the technical field of eccentric shaft machining, and particularly discloses an eccentric shaft multi-procedure one-time clamping machining technology and device which comprises a lathe bed body, a switchable positioning unit, a modular tool magazine, a precision detection module and a control system, and the switchable positioning unit, the modular tool magazine, the precision detection module and the control system are arranged on the lathe bed body. The switchable positioning unit comprises a three-jaw centering assembly, a manual fine adjustment chuck, an automatic compensation positioning mechanism and a tailstock center, the three-jaw centering assembly is in sliding connection with the top position of the lathe bed body, and the manual fine adjustment chuck and the automatic compensation positioning mechanism are both connected with the three-jaw centering assembly through a switching gear set; the modularized tool magazine is located on one side of the lathe bed body. According to the multi-procedure one-time clamping machining technology and device for the eccentric shaft, one-time clamping can meet two precision requirements, the equipment specialization problem is solved, the equipment input cost is reduced, the equipment utilization rate is increased, and meanwhile the machining precision and efficiency are guaranteed.

The utility model discloses a tapper connecting rod which comprises a rotating handle assembly and a tapping assembly, the rotating handle assembly comprises a drill bit limiting sleeve and a limiting mechanism, the tapping assembly comprises a quick conversion head, a positioning drill bit and a cylindrical tapper, and the limiting mechanism comprises a limiting steel ball and a sliding sleeve; a first limiting hole is formed in the drill bit limiting sleeve, the limiting steel ball is installed in the first limiting hole in a matched mode, a first positioning groove is formed in the lower end of the quick conversion head, and the limiting steel ball and the first positioning groove are matched for limiting. A first limiting part and a second limiting part are arranged on the inner side wall of the sliding sleeve, and the sliding sleeve moves in the axial direction of the drill bit limiting sleeve, so that the first limiting part and the second limiting part are matched with the limiting steel balls correspondingly, and the drill bit limiting sleeve and the quick conversion head are locked or unlocked; the positioning drill bit and the cylindrical tapper can be easily detached and pulled out, and the purpose of rapidly withdrawing waste materials or rapidly replacing the cylindrical tapper is achieved.

A friction taper clamping system includes a rotationally symmetrical base body, on which a friction taper attachment with a workpiece holder forming a friction taper is arranged, and a centering element with a centering tip. The centering element is displaceably arranged parallel to the axis of symmetry of the rotationally symmetrical base body in an opening that traverses the base body as well as the friction taper attachment, which opening transitions into the workpiece holder. The centering element can be moved between an extended position, in which the centering tip protrudes from the workpiece holder, and a retracted position, in which the centering tip is located within the workpiece holder. The base body includes at least one clamping device which is configured and set up, at least in the extended position, to clamp the centering element, so that a rotation of the base body is transmitted to the centering element.