86 results about "Centring" patented technology

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 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 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.

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.

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 application discloses a welding equipment with a limiting structure for a human defense door leaf steel bar framework, relates to the technical field of welding, and aims at the problem that the prior art cannot adapt to the steel bar diameter tolerance and height difference, and the partial pressing points are easily virtually pressed or over-pressed, which leads to the decline of the flatness of the steel bar mesh after welding and the poor welding effect, and proposes the following scheme, which comprises a bearing base and a portal frame, a plurality of support plates are arranged on the top outer wall of the bearing base in the length direction, sliding grooves are formed in the upper outer walls of the plurality of support plates, limiting mechanisms are arranged on the plurality of support plates, and the limiting mechanism comprises a sliding seat slidingly arranged in the sliding groove and two connecting blocks connected to the outer walls on the two sides of the sliding seat through bolts. The application can self-centering support and limit the steel bar, and can self-adaptively press the steel bar in cooperation with the limiting mechanism during welding, so that the steel bar is prevented from being warped during welding, and the welding effect is improved.

The invention provides a compensation type extrusion shaping method and device for a welded pipe. The compensation type extrusion shaping device comprises a centering assembly, a sizing assembly, a compensation extrusion assembly and a shaping assembly which are sequentially arranged in the advancing direction of a longitudinal welded pipe. According to the compensation type extrusion sizing method and device for the welded pipe, the axis of the longitudinal welded pipe is positioned through the centering assembly, the roundness is guaranteed through the sizing assembly, it is guaranteed that when the side faces are flattened in the later-section process, the thicknesses of all the side faces are the same, and all the side faces are flattened step by step through the compensation extrusion assembly; the compensation extrusion assembly is synchronously provided with power during flattening, and the linear speed of the power is set to be the same as the output speed of the longitudinal welded pipe, so that it is guaranteed that the pressure and the pulling force borne by all the side faces are the same, and the situation that the longitudinal welded pipe deforms due to uneven stress is prevented; and the problem that the steel pipe is irregularly bent due to stress generated in the steel pipe caused by uncontrollable stress on each side surface during extrusion can be solved, and the production quality is guaranteed.

The invention relates to an autonomous centring-idler station located on a conveyor belt every two existing upper idlers, which solves the problem of existing robust aligning systems which, most of the time, do not fulfil their purpose. The station provides safety, helps to keep the conveyor belt centred and is a complement that helps control operational costs, in comparison with current self-aligning systems. The station comprises a frame-like structure that supports a roller or idler which exerts continuous friction against the left and right edges of the conveyor belt, the frame-like structure being disposed on the conveyor belt using the existing structures. The centring station enables the correct movement position of the conveyor belt to be maintained during the movement thereof, by means of the centring rollers or idlers, arranged opposite each other on the left and right sides of the belt, wherein each centring roller is disposed at a 45° angle, supported by a rolling shaft that is mounted on ball bearings, disposed at a 45° angle and supported between two metal plates. The rolling shaft is inserted inside a tube or cylindrical sleeve made of mild steel that allows the shaft to roll therein and also protects same, such that the HDPE centring idler rotates reliably, supported at the ends thereof on the ball bearings.

The invention relates to the technical field of welding deformation control, in particular to a deformation control method for welding a supporting plate on a circumferential component in the radial direction and application, by forming a groove and reducing the filler volume, the heat input amount during welding is reduced, and heat deformation caused by too large heat input amount during welding is effectively reduced; and tool limiting is carried out in cooperation with the centering block and the rigid connecting rod, possible twisting edge deformation of the supporting plate in the welding process and caused deformation of the supporting plate in the axial direction and the circumferential direction of the circular ring can be effectively guaranteed, and therefore the welding deformation amount of the supporting plate is reduced, and the use requirement is met.

The invention provides a coupling and centering system for enclosed hollow metal plate elevator rails, each two adjacent rails and coupling plate forming a block, and wherein each rail comprises a slide, a side wing and a base having an outer surface, and the coupling plate is arranged on the outer surface of each two adjacent rails, connecting the rails together with the edges of the rails facing each other; wherein: a) each rail has a cutout on the edge of the base facing the adjacent rail, so that the cutouts of the adjacent rails form a recessed through hole; b) the coupling plate has a central hole corresponding to the recessed through hole; c) a clip comprising: c1) a main body located in the adjacent rails in the area where the edges of the main body face each other, which is sized to pass through the recessed through hole; and c2) one or more upper components in continuous contact with the inner walls of the slides of the two adjacent rails facing each other; and c3) means connected to the block of the two adjacent rails and the plate.

The invention discloses a welding positioning device for an air suspension hoop. The welding positioning device comprises a fixed bottom plate, a sliding mechanism, a first inner mold, a second inner mold, a first inclined pressing mechanism, a second inclined pressing mechanism and a centering mechanism, wherein the first inclined pressing mechanism and the second inclined pressing mechanism are symmetrically arranged; the first inner mold and the second inner mold are fixedly arranged on the fixed bottom plate and the sliding back plate respectively, a gap is reserved between the first inner mold and the second inner mold, and semi-arch-shaped supporting blocks of the first inner mold and the second inner mold are used for supporting hoops. The centering insertion piece can be inserted into the gap for centering, the first inclined pressing mechanism firstly presses the first end of the hoop to be attached to the centering insertion piece, after the centering insertion piece is withdrawn, the second inclined pressing mechanism fixes the second end of the hoop, and the sliding mechanism drives the second inner mold to drive the second end of the hoop to be in accurate butt joint with the first end. According to the welding positioning device for the air suspension hoop, strict alignment of the two free ends of the hoop in the up-down direction and the front-back direction is achieved, the welding yield is greatly increased, and the welding positioning device is suitable for the large-batch low-cost production requirement.

The invention is suitable for the technical field of instrument welding, and provides a high-precision instrument welding clamping mechanism which comprises an upper base, a lower base, a three-point centering clamping module, a longitudinal moving module, a height self-adjusting platform and a lateral clamping module, and the lateral clamping module is composed of a driving mechanism, a distance adjusting mechanism and a lateral clamping mechanism body. The lateral clamping mechanism is composed of a mounting assembly, a clamping pulley, a limiting assembly and a reversing assembly. The distance adjusting mechanism is matched with the driving mechanism, so that the clamping pulley can adaptively clamp the dial plate structures with different specifications; the reverse rotation assembly is matched with the driving mechanism and the distance adjusting mechanism to clamp a deviation angle generated when a pulley revolves, the deviation angle is reversely corrected, the deviation angle is made to be perpendicular to the lateral tangent plane of the dial plate structure all the time, and the clamping stability of the dial plate structure is ensured. And the posture consistency and the position stability in the welding process of the dial plate structure and the connector structure are improved.

The invention relates to the technical field of net rack structures, in particular to a positioning device and method for centering a net rack rod piece and a hollow ball. The placing frame can slide in the length direction of the mounting base; the positioning groove is formed in the top of the placing frame, the height of the positioning groove can be adjusted, a groove opening faces upwards, and the two side walls incline upwards and are symmetrically arranged; the centering clamp is mounted on the mounting base, is positioned outside one end of the placement frame and is provided with a positioning taper hole, the axis of the positioning taper hole is parallel to the length direction of the positioning groove, the positioning taper hole is used for accommodating a hollow ball, and the small-diameter end of the positioning taper hole directly faces the placement frame; the positioning connecting rod assembly is provided with an alignment rod, the net rack rod piece can be clamped in the positioning groove, the alignment rod and the net rack rod piece are coaxial after the net rack rod piece is clamped, and the alignment rod can be inserted into the positioning taper hole; the coaxiality of the net rack rod piece and the hollow ball can be improved. The positioning method is based on the positioning device.

The present application relates to the technical field of welding equipment, and discloses a full-automatic ring seam welding machine for carrier rollers, which comprises a concave table, a supporting frame is arranged at the bottom of the concave table to isolate and support the bottom of the concave table; two machining stations are arranged at the top of the concave table, and track grooves for switching the stations are arranged on the front and back sides of the middle part of the top of the concave table. By increasing and arranging an end part processing mechanism, the mechanism can not only realize accurate butt joint of the center parts on both sides through a synchronous cross seat, ensure coaxial operation of the centering structure and synchronous rotation of the roller body, but also can calibrate the parallelism of the protective end cover through an inner-outer double-layer alignment structure, and the outer alignment seat is used to adhere to the outer side of the protective end cover, and the inner alignment seat is driven by hydraulic transmission to hold the inner side of the protective end cover, so that the inclination deviation of the protective end cover can be corrected reliably through the inner-outer cooperative action, and the parallelism between the inner and outer sides of the protective end cover and the end surface of the roller body is ensured.

The invention relates to the related technical field of manufacturing of welding equipment, discloses welding equipment for producing and manufacturing a front rack part of a land leveler, and aims to solve the problems that a large welding seam exists between a supporting beam and a flange plate and the follow-up welding quality is not easy to detect. The flange plate is centered and clamped through the chuck, then the movable top frame inclines downwards, the gravity of the guide sliding base and the gravity of the supporting beam are concentrated to the contact portion between the supporting beam and the flange plate, and the problem that a welding seam is too large due to the fact that pressing is not in place is avoided. After welding is completed, the movable top frame is pushed again to incline upwards through the lifting assembly, at the moment, the movable top frame moves in the direction away from the flange plate through the gravity of the guide sliding base and the supporting beam, and if welding is not firm, the supporting beam and the flange plate can be directly separated due to traction of the guide sliding base; therefore, the purpose of welding quality bearing detection is achieved.

Fixing device (1) for fixing a pipe welding device to a dimensionally stable, in particular circular cylindrical, pipe section (32, 33) to be welded, wherein the fixing device (1) comprises: a rotating device (22) for rotating, in particular in a circular arc shape, a welding head of the pipe welding device about an axis of rotation; a gripping device comprising a first gripping arm (2) with a first clamping jaw (6) attached thereto with exactly one first concave clamping surface and a second gripping arm (3) with a second clamping jaw (7) attached thereto with exactly one second concave clamping surface, where: the first clamping jaw (6) is rotatably mounted on the first gripping arm about an axis (4) running parallel to the axis of the pipe section (32, 33) over a predetermined angular range, such that it can be selectively brought into different orientations (8, 10, 12) relative to the first gripping arm (2) by means of a rotational movement about the axis (4) running parallel to the axis of the pipe section (32, 33) and can be fixed in these orientations (8, 10, 12), each of which corresponds to an associated pipe diameter; wherein for each such diameter of the pipe section (32, 33) a respective first bore is provided on the first clamping jaw (6) and the first clamping jaw (6) can be fixed by means of an inserted fixing pin (9) through the respective first bore into a second bore of the first gripping arm (2); wherein the second clamping jaw (7) is attached to the second gripping arm in such a way that it is freely rotatable relative to the latter over a predetermined angular range about an axis of rotation (5) running parallel to the axis of rotation of the pipe section (32, 33); and The gripping device is configured to fix the pipe welding device to the pipe section (32, 33) by means of a clamping action exerted by the clamping jaws via their concave clamping surfaces on the pipe section (32, 33) from an open position to a closed position dependent on the currently selected and fixed orientation (8, 10, 12) of the first clamping jaw, with a reduced distance between the concave clamping surfaces compared to the open position, in which a symmetry axis of a dimensionally stable, in particular circular cylindrical, pipe section (32, 33) clamped between the concave clamping surfaces of the clamping jaws (6, 7) running parallel to the axis of rotation of the rotating device (22) is spaced from the axis of rotation by a maximum specified amount of a maximum of 2% of the diameter of the pipe section (32, 33).

The application discloses a self-centering clamp structure for honing disc parts, wherein the disc part is provided with an inner hole along the direction of a central axis, and the clamp structure comprises a clamp body, a taper sleeve and a locking nut; the clamp body is provided with a central hole at both ends, which is matched with a machine tool center during honing; the outer peripheral wall of the clamp body is provided with a stop part, a conical part and a threaded part; the taper sleeve is sleeved on the conical part; the locking nut is matched with the threaded part and is in contact with one end of the taper sleeve; the inner hole of the disc part is sleeved on the outer peripheral wall of the taper sleeve; one end of the disc part is supported on the stop part; and the locking nut is rotated to push the taper sleeve to slide on the conical part so as to tighten or relax the inner hole of the disc part. The application has the advantages of high clamping efficiency and high part surface quality.

The utility model discloses a simple inner support fixture for machining, which is characterized by comprising a chuck, a forging blank, a positioning fixture and a tail top, the tail end of the positioning fixture is positioned on the chuck, a positioning shaft is used for positioning the inner wall of the forging blank, and the tail top is used for abutting against the bottom of the forging blank. The positioning clamp comprises a positioning shaft and a convex shaft, the convex shaft is located at the top of the positioning shaft, the diameter of the positioning shaft is larger than that of the convex shaft, and the axis of the positioning shaft coincides with that of the convex shaft; an elastic supporting ring is arranged at the connecting position of the protruding shaft and the positioning shaft in a sleeved mode, a rigid spacer bush is further arranged on the outer side of the protruding shaft in a sleeved mode, the spacer bush is cylindrical, and a certain jacking force is exerted on the tail top to force an elastic deformation element to press a forging blank piece, so that a blank cylinder barrel is centered through an inner hole, and rotating force of a lathe is transmitted.

The application discloses a self-balancing round hole wall friction and wear measuring platform, which comprises an outer support frame, a test block lifting mechanism, a rock rotating mechanism, a rock centering mechanism and a limiting mechanism; the outer support frame is used for supporting other mechanisms; the test block lifting mechanism is used for driving the test block to reciprocate; the rock rotating mechanism is used for driving the rock to rotate; the rock centering mechanism is used for centering the rock; and the limiting mechanism is used for limiting the rock rotating mechanism; the application can realize the curved surface-to-curved surface test mode between a test block and a rock with a large size through the cooperation between various mechanisms; the friction and wear performance between test blocks with different sizes or different surface structures and the rock can be measured by replacing test heads or changing the surface structure of test pieces; two test blocks can simultaneously contact the round hole wall of the rock for testing, so that the balance of the whole system can be ensured, the eccentric wear phenomenon can be prevented, and the test precision is ensured.

An adjustable clamping device, namely a welding or cutting device, relates to the field of machine tool clamping device technology. It includes: a rotatable four-jaw self-centering chuck supported by a base, having four fixed seats evenly distributed around the rotational axis of the chuck, the four fixed seats being configured to synchronously move closer to or further away from the rotational axis; the adjustable clamping device further includes clamping assemblies corresponding to each fixed seat, the clamping assemblies including adjusting seats and jaws; the adjusting seats have first toothed portions, and the jaws have second toothed portions that mesh with the first toothed portions; the second toothed portions can mesh with the first toothed portions at different positions, so that the distance between the clamping portions of the two jaws in relative positions is adapted to the shape of the workpiece to be clamped, improving work efficiency. The aforementioned welding or cutting equipment includes the adjustable clamping device described above.