209 results about "Centring" patented technology

The invention relates to the technical field of welding processing, in particular to a multi-specification part positioning device for a welding machine tool, which comprises a base, a rotating seat is rotatably mounted on the base, a supporting table is fixedly mounted on the rotating seat, and a flange positioning device for positioning flange plates of different specifications for forming elbow pipe workpieces is fixed on the supporting table. According to the device, flanges of different specifications can be positioned in a self-adaptive mode through the flange positioning device, meanwhile, pipe bodies of different specifications are positioned and clamped in a self-adaptive mode through the centering and clamping device, the extrusion device, the rotary mounting frame and the station conversion device, and the welding direction of the pipe bodies can be automatically replaced; therefore, the pipe body does not need to be replaced manually, the clamp does not need to be replaced when bent pipe workpieces of different specifications are machined, the problem that an existing positioning device cannot conduct self-adaptive positioning and clamping on bent pipe parts of different specifications is solved, operation steps can be effectively reduced, and the welding precision and the welding efficiency can be improved.

The invention relates to the technical field of machining, and discloses a steel structural part drilling device which comprises a table top, a continuous drilling mechanism, an automatic synchronous conveying mechanism and a centering clamping mechanism. A back plate is fixedly arranged on the top of the rear side wall of the table top, the back plate is perpendicular to the table top, and the continuous drilling mechanism is arranged on the upper portion of the front side wall of the back plate. By arranging the automatic synchronous conveying mechanism, the movable teeth can be closed and separated from the driving gear during drilling, so that the conveying belt is kept fixed during drilling, a clamp and a workpiece on the surface of the conveying belt are kept fixed during drilling, and after drilling is completed, the movable teeth are opened and engaged with the driving gear; the driving gear drives the conveying belt to rotate anticlockwise, the conveying belt drives the clamp and the workpiece on the surface of the conveying belt to move when rotating, the workpiece which is not punched is conveyed to the bottom of the drill bit, and therefore automatic synchronous feeding is achieved, feeding continuity during drilling is guaranteed, and the drilling efficiency is improved.

The invention discloses an adjustable self-centering drilling device which comprises an adjusting screw rod and an adjusting cone, and the bottom end of the adjusting screw rod is fixedly connected with the adjusting cone; a center hole is formed in the center of the adjusting cone and used for allowing the spring fixing rod to penetrate. A groove gap is formed in the side part of the adjusting cone and is communicated with the central hole; a threaded hole is formed in the base, and the adjusting screw rod penetrates through the threaded hole and can move up and down; a plurality of positioning holes are formed in the base and used for allowing a drilling tool to penetrate through; the fixed cover is fixedly connected with the base; a through hole is formed in the fixed cover; the periphery of the fixed cover is sleeved with a to-be-machined workpiece; one end of the telescopic rod is provided with a boss which is used for being inserted into the edge of the groove gap and can slide, and the other end of the telescopic rod penetrates through the through hole and is fixedly connected with the telescopic supporting head; one end of the telescopic spring is connected with the spring fixing rod, and the other end of the telescopic spring is connected with the telescopic supporting head; by means of the device, machining of circumferential flange holes of a workpiece to be machined can be completed in a self-centering mode, and additional standard alignment is not needed.

The utility model discloses a centring and clamping mechanism applied to round metal piece, including bottom plate, clamping cylinder, wedge plate and positioning and clamping mechanism, the middle part of bottom plate is equipped with the positioning and clamping mechanism along Y axis, wedge plate nests and sets up in the positioning and clamping mechanism, one side of bottom plate is fixed with clamping cylinder, and the clamping cylinder is fixed with the clamping cylinder. The telescopic end of the clamping air cylinder is in locking connection with a wedge plate, and the bottom of the wedge plate is fixedly connected with a bottom plate through an X-axis linear guide rail. The positioning and clamping mechanism comprises two oppositely-arranged clamping plates, a positioning groove for containing the circular workpiece is formed between the clamping plates, a clamping air cylinder drives a wedge plate to move along the X axis, the wedge plate drives the two clamping plates to move oppositely, and the positioning groove clamps or loosens the circular workpiece. The centering clamping device is high in clamping force and precision, precision loss or fatigue cannot be caused after the centering clamping device is used for many times, and a round metal piece can be accurately centered and clamped.

The utility model discloses a thin-wall end socket machining deformation precision size control device which comprises a clamp body, a placing table is arranged on the upper portion of the clamp body, a centering structure and a fixing mechanism are arranged on the placing table, a center protruding portion is arranged on the placing table, the centering structure comprises a disc spring arranged around the center protruding portion, and the disc spring is connected with the fixing mechanism. A locking disc is arranged on the upper portion of the disc spring, a locking connecting rod is connected to the locking disc, a through hole is formed in the center of the center protruding part, the locking connecting rod is movably arranged in the through hole, the position of the locking connecting rod is adjusted so that the distance between the locking disc and the disc spring can be changed, and centering of the thin-wall end socket can be achieved. And the top of the thin-wall sealing head is pressed. Precise positioning and reliable clamping of the seal head part on a machine tool can be easily achieved, it is guaranteed that the machining size of the seal head part meets the requirement, and the problem that the machining size of the seal head is out of tolerance is solved.

The invention provides a hoisting sling with an anti-slip structure, and relates to the technical field of hoisting slings. Two sets of welding seats are welded to the left side and the right side of the fixing frame correspondingly, hinge arms are hinged to the lower ends of the welding seats, bottom rods are fixed between the two sets of hinge arms close to the left end of the fixing frame and between the two sets of hinge arms close to the right end of the fixing frame correspondingly, and clamping seats are installed on the bottom rods through bolts; a third hydraulic rod extends to enable a clamping plate to clamp a steel structure, rotating arms are hinged to the left side and the right side of a top frame, fifth hydraulic rods are installed between the rotating arms and the top frame, and centering plates are installed between the two sets of rotating arms close to the left side of the top frame and between the two sets of rotating arms close to the right side of the top frame. The two ends of the steel structure are clamped through two sets of centering plates by extending the fifth hydraulic rods, the steel structure is located under the top frame, when the steel structure is clamped through the clamping plates, the gravity center of the steel structure can be prevented from shifting, and the safety during hoisting is improved.

The invention relates to the field of angle measurement, in particular to a positioning measurement device for pipe jacking construction, which comprises a working well and a pipe body mounted on the lower part of the side surface of the working well in a penetrating manner, a turnover piece is mounted on the inner side surface of the working well, and the end part of the turnover piece is connected with a center frame; the axis of the center frame is aligned with the center point of one end of the pipe body, a centering frame is coaxially arranged at the other end of the interior of the pipe body, a plurality of inclined fixing frames are obliquely arranged on the outer side of the center frame in an annular array mode, the inclined fixing frames are attached to the inner edge of one end of the pipe body, and a plurality of wheel frames are arranged on the outer side of the centering frame in an annular array mode. And centering wheels are installed at the two ends of the wheel frame and attached to the inner wall of the pipe body, and a detection piece is installed at the end of the center frame. According to the invention, the detection convenience is improved, the device can adapt to pipe bodies with different diameters, the detection requirement is met, and meanwhile, the normal operation of pipe jacking construction operation is ensured.

The utility model discloses a quick reloading centre hole pre-drilling clamp, which comprises a processing platform and a clamp tool, the clamp tool comprises a chuck body, a hydraulic driving assembly, a plurality of guide blocks, a plurality of mounting arms and a plurality of clamping jaws, the chuck body is of a hollow structure, and a plurality of sliding chutes in one-to-one correspondence with the guide blocks are formed in the top of the chuck body at equal intervals; the guide blocks are arranged in the sliding grooves in a sliding mode and can be driven by the hydraulic driving assembly to move inwards and / or inwards. And the mounting arm is detachably mounted at the top of the guide block. A traditional three-air-cylinder synchronous clamping centering method is changed into a hydraulic stretching synchronous clamping method, and the defect that products are not concentric in clamping can be overcome; in addition, multiple sets of positioning grooves and positioning blocks are designed between the clamping jaw and the mounting arm according to the outer diameter sizes of products of different models, fixation can be achieved through one screw during follow-up assembly, and the problem that time is wasted when the clamp is adjusted when the products of different outer diameters are replaced can be solved.

The steel box girder assembling support comprises a base, the upper end of the base is connected with at least one row of supporting stand columns, the upper ends of the supporting stand columns are fixedly connected with a supporting bracket, and the supporting bracket is connected with a plurality of supporting piers; movable grooves are formed in the two ends of the supporting bracket, an adjusting through hole is formed in the position, between the movable grooves in the two sides, of the supporting bracket, L-shaped positioning columns are slidably connected into the movable grooves in the two sides, centering adjusting mechanisms for driving the L-shaped positioning columns on the two sides to relatively slide are arranged in the adjusting through hole, telescopic grooves are formed in the upper ends of the L-shaped positioning columns, and positioning insertion blocks are slidably inserted into the telescopic grooves; first hydraulic cylinders are connected into the telescopic grooves, flange plate supporting arms are hinged to the inner sides of the L-shaped positioning columns, swing arm mechanisms for driving the flange plate supporting arms to swing are arranged on the L-shaped positioning columns, and positioning pressing plates are detachably arranged above the positioning insertion blocks on the two sides. By means of the method, lateral restraining and transverse positioning of the steel box girder segments can be provided during steel box girder construction, the splicing position can be conveniently and rapidly determined, and the splicing efficiency is greatly improved.

The utility model discloses a motor rotor shaft turning clamp that can be self-adaptive and tightly hold and flexibly position, relates to the field of machining, and is composed of Morse taper, external thread connecting shaft, spring collet, threaded sleeve and adjusting sleeve and other components for connecting with the main shaft of machine tool. The sliding cavity of the front end of the external thread connecting shaft is provided with a sliding sleeve and a telescopic spring, and the sliding sleeve is fixedly connected with the spring collet. The sleeve sleeve of the front end of the threaded sleeve is sleeved outside the spring collet, and the inner wall of the front end is provided with a conical surface that is matched with the conical head of the spring collet. The adjusting sleeve is connected with the threaded sleeve through threads, and can drive the limiting sleeve to push the spring collet to move. During use, rotating the adjusting sleeve makes the spring collet move backward, and the spring collet is tightened under the action of the conical surface, the rotor shaft is self-adaptively and tightly held, and the telescopic spring realizes flexible positioning and compensates for the axial and angular deviation. The clamp can automatically adapt to the rotor shaft with a diameter tolerance within a certain range, has high self-centering precision, is suitable for high-precision turning machining of conventional rotor shafts, and has simple structure and convenient maintenance.

The application belongs to the technical field of center shaft polishing, and is especially a center shaft polishing machine, which comprises a rack one, a feeding mechanism and a storage mechanism are arranged on the front and back sides of the rack one respectively, a clamping mechanism one, a clamping mechanism two and a floating polishing mechanism are installed on the top of the rack one, a transfer mechanism is arranged between the clamping mechanism one and the clamping mechanism two and installed on the rack one, the transfer mechanism is used for intermittently grabbing two center shaft workpieces on the feeding mechanism, conveying the two center shaft workpieces to the clamping mechanism one and the clamping mechanism two, carrying out centering clamping, and polishing the side surfaces of the two center shaft workpieces through the floating polishing mechanism. The application can simultaneously polish two center shaft workpieces, compared with the traditional single polishing equipment, the device is more efficient, and the whole polishing process is fully automated operation, without too much participation of manual work.

The invention relates to a centering unit (10) comprising: a housing (11) in which a centering rod (13) is at least partially housed, the centering rod being linearly movable along an actuation axis (A) between a first minimum pull-out position pulled out of the housing (11) and a second maximum pull-out position pulled out of the housing (11); and an anti-rotation assembly (40) configured to prevent rotation of the centering rod (13) about the actuation axis (A) during movement of the centering rod between the first position and the second position; characterized in that the anti-rotation assembly (40) comprises a sliding block (41) fixedly connected to the centering rod (13) and a guide (42) fixedly connected to the housing (11), in which the sliding block (41) is constrained to slide along the guide (42) in a direction parallel to the actuation axis (A) by the intervention of at least one pair of rollers (46) arranged side by side, their respective roller shafts are contained in planes parallel to each other and are transverse to each other.

The invention relates to the field of mechanical manufacturing, in particular to a steel balance block machining center clamp which comprises a mounting plate and a plurality of sets of clamps, the clamps position and clamp steel balance blocks, and each clamp comprises a centering mechanism, an upper pressing mechanism and a side jacking mechanism. The centering mechanism is sleeved with an inner ring of the steel balance block, the centering mechanism comprises a plurality of jacking blocks which expand and extend outwards from the center of the inner ring, and the jacking blocks abut against the side wall of the inner ring. An inner ring of the steel balance block is tightly jacked, an assembling gap generated when the steel balance block is assembled is eliminated, then the upper pressing mechanism and the side jacking mechanism are matched for positioning the steel balance block, multi-point positioning is formed on the steel balance block, a positioning network is formed through multi-point positioning, and then accurate positioning of the steel balance block is achieved. And the machining precision of the steel balance block is improved.

The utility model discloses a multi-axis moving mechanism for intelligent welding, which belongs to the technical field of welding, and comprises a bottom plate and a welding piece placing disc, and a crank type three-degree-of-freedom moving mechanism is mounted at the upper end of the bottom plate; the crank type three-degree-of-freedom moving mechanism comprises a driving assembly and a movable supporting assembly. The driving assembly is installed at the upper end of the bottom plate. The lower portion of the movable supporting assembly is connected with the driving assembly, and the upper portion of the movable supporting assembly is connected with the welding piece containing disc. And an automatic centering clamping mechanism is mounted at the upper end of the welding part placing disc. Through cooperation of the driving assembly and the movable supporting assembly, the spatial position of a welding piece is continuously changed from multiple angles such as the horizontal angle or the vertical angle; and an additional positioning mechanism does not need to be arranged through the automatic centering clamping mechanism, it is guaranteed that all the welding pieces can be located at the set welding point positions, and the practicability of the device is improved.

A drilling and positioning tool for a main gear of a differential mechanism comprises a base, an inner hexagon bolt, a height reference block, a workpiece blank, a pull rod, a centering expansion sleeve and a mandrel, the base is of a rectangular structure, a bolt hole is formed in the center of the base, the inner hexagon bolt is installed on the edge of the base, and the height reference block is installed on the height reference block. The height reference block is installed in the center of the base, the central part of the height reference block is provided with the core shaft, the upper part of the core shaft is provided with the centering expansion sleeve, the centering expansion sleeve is provided with the workpiece blank, and the upper part of the workpiece blank is provided with the pull rod; compared with a traditional three-jaw chuck, the three-jaw chuck has the advantages of being long in clamping time, firm in clamping and high in progress.

The utility model discloses a self-centering high-speed steel abrasive drill which comprises a drill bit, a mounting seat, a mounting head at the top of the drill bit, a mounting opening formed in the inner side of the bottom of the mounting seat, a mounting groove formed in one side of the interior of the mounting opening, a spring arranged on the inner side of the mounting groove, a clamping block arranged at the top of the spring and a clamping groove formed in one side of the top of the mounting head. The limiting rail is used for limiting the limiting strip, so that other structures on the inner side of the mounting opening are aligned, the mounting head pushes the clamping block into the mounting groove through the inclined surface at the bottom of the clamping block, after the mounting head is mounted, the clamping block is clamped in the mounting groove, and the clamping block is clamped in the mounting groove. The clamping blocks can be bounced into the clamping grooves through the springs, so that the clamping blocks fix the clamping grooves, the mounting head is fixed, after the position of the mounting head is mounted, a fixing bolt penetrates through a fixing opening and is connected with a fixing screw opening, and therefore the mounting head is fixed, and otherwise, the mounting head is dismounted.

The invention relates to the technical field of flange joint welding, and provides a welding positioning device for flange joint processing, which comprises a positioning table and a clamping seat, a control panel is installed on one side of the top end of the positioning table, a positioning groove is formed in the middle of the top end of the positioning table, a flange is placed at the top end of the positioning groove, a connector is placed in the middle of the flange, and a positioning structure is arranged on one side of the top end of the positioning table. Through cooperation of the positioning cone and the three sets of positioning claws, when the conical surface of the positioning cone moves downwards, the three sets of positioning claws are pushed to move outwards synchronously, so that the moving blocks are driven to slide in the moving grooves, the outer sides of the three sets of positioning claws abut against the inner wall of the connector, the inner wall of the connector is abut against the three sets of positioning claws, and forced coaxial centering is completed; due to the fact that the positioning claws are evenly distributed by 120 degrees and synchronously move, the jacking force can be gradually transmitted from the eccentric side to the center, finally the eccentric connector is pushed to the center of the flange, and concentric positioning of the connector and the flange is completed.

This invention provides a pipeline laying method and a centering component that enable smooth and low-cost joining of leading and trailing pipes. [Solution] The pipeline laying method comprises an installation step of installing a centering member 8 on the inner surface of the socket of the lead pipe 3; a centering step of inserting the insertion end of the lead pipe 4 into the socket of the lead pipe 3 and inserting the centering member 8 into the gap between the inner surface of the socket of the lead pipe 3 and the outer surface of the insertion end of the lead pipe 4 to align the pipe axes of both pipes 3 and 4 at the joint portion of both pipes 3 and 4; and a retrieval step of, after the centering step is completed, pulling out the centering member 8 from between the inner surface of the socket of the lead pipe 3 and the outer surface of the insertion end of the lead pipe 4 and retrieving it. The centering member 8 has a plate-shaped portion 8a that is sandwiched in the gap between the inner surface of the socket of the lead pipe 3 and the outer surface of the insertion end of the lead pipe 4, and an extended piece 8b that protrudes from the gap and extends from the plate-shaped portion 8a so as it moves away from the plate-shaped portion 8a, it moves away from the outer surface of the insertion end of the lead pipe 4.

A tapping and positioning tool for threaded holes of a tapered cabin body perpendicular to the busbar, characterized in that it comprises a guide frame (2) and a positioning pin (3), wherein the guide frame (2) comprises a tapered tube annular portion (21), and a first strip plate (22) and a second strip plate (23) extending upward from the tapered tube annular portion (21); wherein the first strip plate (22) and the second strip plate (23) are respectively parts of the tapered tube shape, and the first strip plate (22) and the second strip plate (23) are centrally symmetrical structures centered on the central axis of the tapered tube; the present invention solves the problem that manual tapping of threaded holes of a tapered cabin body perpendicular to the busbar is often crooked, and a fitter can use the positioning hole on the guide frame as a tap guide to directly tap with two tapers without the need for centering the head taper, and the manual tapping efficiency is increased by 1 times, which has certain reference significance for the design of manual tapping and positioning tooling for threaded holes of such cabin bodies.

The present application relates to the field of coaxial butt joint in pipe welding, and discloses a correction butt joint method before large pipe welding, step one: the pipe to be welded is moved to between two groups of butt joint auxiliary devices; step two: the clamping correction mechanism is inserted into the pipe; step three: the clamping correction assembly clamps the pipe coaxially and self-centers; step four: among the two groups of clamping correction members, one group clamps the pipe wall, and the other group is switched to the correction state to correct the recess on the surface of the pipe, so that the recess correction on the surface of the pipe is realized without dead angle, and then the two groups of clamping correction members are kept in the clamping state; step five: the two groups of mounting seats are close to each other, the two pipes are close to each other, then the feeding mechanism drags the clamping correction mechanism and the pipe to move, and the two pipes finally complete the coaxial butt joint.

The utility model discloses a supporting device for a binding machine, which comprises a slide rail base, an end part supporting structure is arranged at the end part of the slide rail base, an overturning frame and a chuck structure are arranged on the slide rail base from front to back, and the chuck structure comprises a first bottom frame, a first lifting frame and a three-jaw self-centering chuck; the overturning frame comprises a second bottom frame, a second lifting frame and a rubber roller; the end supporting structure comprises a third bottom frame, a third lifting frame and a supporting platform. The inductor winding and supporting device is reasonable and ingenious in structural design, the end supporting structure supports the head of a sleeve, the overturning frame supports the middle of the sleeve, an inductor is overturned through a rubber roller, the chuck structure clamps the tail of the sleeve and provides forward driving force, use is flexible and convenient, and the inductor winding and supporting device can be suitable for winding and supporting inductors of different sizes.

The invention discloses a device for eliminating rotation center deviation, and relates to the technical field of cantilever type tray winding machines, the device comprises a positioning shell, the interior of the positioning shell is of a hollow cavity structure, and a positioning hole is formed in the axis of the top end of the positioning shell; the neat curved surface body is movably arranged in the cavity of the positioning shell, the outer wall of the neat curved surface body is in clearance fit with the inner wall of the positioning hole, an air cylinder connecting guide rod is vertically and fixedly connected to the top of the neat curved surface body, and the top of the air cylinder connecting guide rod penetrates through the positioning hole and extends to the position above the positioning shell; the bottom plate is fixedly connected to the side, away from the positioning hole, of the positioning shell. According to the invention, the outer wall of the curve of the neat curved surface body is in clearance fit with the inner wall of the positioning hole, so that self-centering positioning is realized, the deviation when the guide rod and the cantilever are not concentric is eliminated, the disc does not deviate any more, and the packaging quality of the tray is improved.

The utility model discloses an asymmetric hard alloy drill piece, which relates to the technical field of cutting tools and comprises a drill piece body, a first cutting edge, a second cutting edge, a fourth cutting edge and a fifth cutting edge are respectively arranged on two sides of the drill piece body, and the first cutting edge, the second cutting edge, the fourth cutting edge and the fifth cutting edge are of asymmetric structures. An inclined third cutting edge is arranged between the second cutting edge and the fourth cutting edge, a horizontal welding face is arranged at the lower end of the drilling piece body, the drilling piece body is designed to be of an asymmetric structure, through research and design of the mechanics principle, when the alloy drilling piece conducts drilling operation, a unique cutting track is formed, and the drilling efficiency is improved; and during drilling operation, due to the asymmetrical design, a crossed and transformed drilling center is generated, compared with a traditional symmetrical drilling piece, accurate positioning and rapid hole entering on a brittle and hard ceramic tile or glass are more facilitated compared with one-point self-centering of the traditional symmetrical drilling piece, the punching efficiency is high, and the punching quality is good.

Centring device for reversible attachment to a setting tool for blind rivet nuts In a centring device (1) for reversible fastening to a setting tool (3) for blind rivet nuts (17), a base element (2) is provided for connection to the setting tool (3), to which a support element (4) is arranged at a distance. An opening (9) is provided in the support element (4), which is designed for the passage of at least one region of a screwing tool (10) of the setting tool (3) and the centre axis of which can is alignable coaxially with a longitudinal axis of the screwing tool (10) that can be passed through. There are centring means (13) arranged around the opening (9), which extend axially to the centre axis of the opening (9). The centring means (13), which are fixed with their one end (14) to the support element (4) around the opening (9), extend symmetrically in a conical shape away from the support element (4) towards the centre axis and form an expandable conical head (16) with their second free end (15).

The present application relates to the technical field of building construction, and discloses a reinforcing cage auxiliary rotating device, which comprises a turnover driving assembly, a shaft centering connecting assembly and a supporting assembly, the supporting assembly is provided with a movable resting part for supporting the reinforcing cage, the shaft centering connecting assembly comprises a centering assembly and a connecting assembly, the centering assembly comprises a measuring assembly and a centering assembly, the measuring assembly comprises a first measuring piece, a second measuring piece and a side leaning piece, and the centering assembly comprises a transverse scale, a longitudinal scale and a reinforcing bar inserting sleeve, the transverse scale is used for measuring the distance between the first measuring piece and the side leaning piece, and the diameter of the reinforcing cage is determined. Through the arrangement of the turnover driving assembly, the shaft centering connecting assembly and the supporting assembly, the torsional force can be reduced during the rotation of the reinforcing cage, the reinforcing cage rotates stably, deformation is avoided, personnel inspection and reinforcing winding are facilitated, the work efficiency is improved, and the work intensity is reduced.

The present invention discloses a method for supporting the roof of a water-rich soft rock tunnel, and relates to the field of soft rock support. It solves the problem that temporary support is needed for the tunnel when anchor bolt support is used for anchor grouting and drilling. The existing temporary support is time-consuming and labor-intensive to be manually constructed, and the manual construction is prone to the offset of the temporary support device, which makes the support force uneven. A method for supporting the roof of a water-rich soft rock tunnel, comprising the following steps: first adjusting the support spacing and applying support to both sides of the soft rock tunnel, then docking and self-locking the support main frame, followed by anchor grouting and drilling, and finally anchoring and resetting. The method for supporting the roof of a water-rich soft rock tunnel of the present invention saves time and effort in supporting operations, and through centering and correcting support, the support frame and the support main frame cooperate to make the support force uniform, thereby preventing accidents in the tunnel during anchor grouting and drilling.

The invention relates to a striking tool equipped with a centering system (46) and configured to extract an element (34) from an orifice (36) in a part (38). This centering system comprises: a sliding body (48) which includes a through hole (52), with a cross-section identical to that of the shaft (42) of the striking tool (32), allowing it to slide without play along said shaft (42), a housing (48.3), configured to house the element (34) to be extracted in a tight fit, centered with respect to the through hole (52), at least one contact face (48.2, 50.1) substantially perpendicular to the axis of the through hole (52) and configured to be pressed against a support face (F38) of a part (38) around the element (34) to be extracted. This solution allows for better centering and guidance of the striking tool's shaft relative to the element to be extracted. Figure 3

The self-centering alignment device comprises an auxiliary tool body, a part body and an automatic alignment block, alignment grooves are formed in the two sides of the inner side of the auxiliary tool body, the two sides of the auxiliary tool body are in threaded connection with two sets of fixing bolts, and standard correction blocks are arranged on the two sides of one end of the auxiliary tool body; the auxiliary tool body, the part main body, the automatic alignment block, the standard correction block, the alignment groove and the fixing bolt are matched with one another, so that the traditional process of manually adjusting the center height of a product and manually aligning is changed, the manufacturing error of the previous process is eliminated, the center height is automatically aligned, the center axis of the auxiliary tool is positioned through the horizontal V shape, and the production efficiency is improved. The central axis of a product part is completely parallel to the plane of equipment, the axial diameter and cylindricity form and position errors are eliminated, the device has the advantages of being simple in structure, convenient to operate, high in reliability and the like, and the bottleneck that ultrahigh-hardness and high-precision parts cannot be produced in batches is solved.