235results about "Expansion mandrels" 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 utility model relates to the technical field of positioning tools, and particularly discloses a quick positioning device for processing internal and external key grooves, which comprises a mandrel, an expansion sleeve, a nut and a processing workpiece, a threaded section is arranged on the surface of the mandrel, a positioning block is fixedly arranged on the surface of one end of the mandrel, a clamping groove is arranged on the outer circumferential surface of the expansion sleeve, and key grooves are arranged in an inner hole of the processing workpiece. Positioning strips are fixedly arranged on the outer circumferential surface of the expansion sleeve. According to the technical scheme, the opening seams are evenly distributed in the two ends of the expansion sleeve, the mandrel is attached to the conical surface of the expansion sleeve, the expansion sleeve is matched with the nut to achieve radial expansion of the expansion sleeve and used for clamping a workpiece, the positioning strip of the expansion sleeve is connected with the key groove of the machined workpiece in a clamped mode, and anti-play assembly of the expansion sleeve and the machined workpiece is achieved. The mandrel is clamped into the clamping groove of the expansion sleeve through the positioning block to achieve anti-play assembly of the mandrel and the expansion sleeve, so that when the two ends of the mandrel are fixed, a machined workpiece can be rapidly positioned, and the outer key groove to be machined of the machined workpiece can be conveniently machined.

The invention relates to the technical field of positioning of thin-walled workpieces, discloses a thin-walled workpiece anti-deviation positioning device based on a numerical control machine tool, and aims to solve the technical problems that thin-walled workpieces are prone to deformation during positioning and traditional clamping blocks are poor in adaptability. The thin-walled workpiece anti-deviation positioning device comprises a numerical control machine tool body, a rotating chuck, an adjustment driving assembly, a push rod assembly and an expansion positioning assembly; the circular-truncated-cone-shaped pushing block converts rotary motion into linear motion through a lead screw nut mechanism and is matched with the limiting assembly to drive the push rod assembly to synchronously, evenly and radially stretch out and draw back, the spring steel sheet with the preparation section is driven to achieve curvature self-adaption, and the preparation section can slidably compensate the arc surface section to adapt to thin-wall pipe fittings with different pipe diameters and keep surface contact. The device is provided with a front group of staggered expansion positioning rings and a rear group of staggered expansion positioning rings, full-circumferential gapless support on the inner wall of the pipe fitting is formed, the problem of stress concentration caused by line contact is avoided, deformation of the thin-wall pipe fitting is effectively prevented, the requirements for positioning firmness and deformation prevention are considered, and the machining qualification rate and production efficiency of the thin-wall pipe fitting are remarkably improved.

The utility model relates to the technical field of clamps, and discloses a manufacturing clamp which comprises a base, a straight plate is fixedly connected to the surface of the base, a clamping assembly is arranged on the side wall of the straight plate and comprises a rotating disc, the rotating disc is fixedly connected to the side wall of the straight plate, a fixing shaft is fixedly connected to the side wall of the rotating disc, and the fixing shaft is fixedly connected to the side wall of the straight plate. The interior of the fixing shaft is slidably connected with two groups of symmetrically arranged circular rings, a sliding groove is formed in the side wall of the fixing shaft, the interior of the sliding groove is slidably connected with two groups of symmetrically arranged mounting seats, and the mounting seats are fixedly connected to the side walls of the circular rings. According to the device, the two-way threaded rod is driven by the first motor to rotate, then the two circular rings are pushed to move relatively along the inner wall of the fixing shaft, the inclination angle of the supporting plate is changed, the end of the supporting plate is connected with the arc-shaped plate in a hinged mode, and therefore the attaching degree of the arc-shaped plate and the inner wall of the tubular part can be adjusted according to the inclination of the supporting plate; the precision of the clamp is improved.

The invention belongs to the technical field of turning, and particularly relates to a turning device for motor shaft machining, which comprises a lathe body and a slide rail arranged on the lathe body, a splash-proof door is slidably arranged on the lathe body, a three-jaw chuck is rotatably arranged on the lathe body, a tool apron and a moving part are slidably arranged on the slide rail, and the moving part comprises a containing seat. An avoiding groove and a limiting groove are formed in the accommodating seat; according to the turning device for machining the motor shaft, when a solid motor shaft blank is machined, a conical structure composed of the sharp claws can be directly utilized to abut against a center hole of the motor shaft blank to achieve positioning, and when a hollow motor shaft blank is machined, inner supporting and fixing can be achieved only by driving the sharp claws to expand in the radial direction through an adjusting mechanism; the embedded seat of the limiting mechanism can be matched with the limiting groove of the containing seat to lock the position of the mounting column, when workpieces of the same model are machined, the second handle is pulled to enable the sharp claw to be separated from the workpieces after locking of the mounting column is removed, rapid unloading of the workpieces is achieved, and when a new workpiece is clamped again, only the mounting column needs to be reset, and the original positioning precision can be restored.

The utility model relates to the technical field of machining. The inner supporting tool comprises a supporting plate, a plurality of sliding rails are evenly arranged on the supporting plate, sliding blocks are arranged on the sliding rails in a sliding mode, inner supporting pieces are arranged at the tops of the sliding blocks, a mounting base is arranged at the bottom of the supporting plate, and a driven gear is rotationally arranged on the mounting base. A plurality of arc-shaped through grooves are evenly formed in the driven gear, the bottoms of the sliding blocks are arranged in the through grooves in a sliding mode, the ends of the sliding rails are fixedly arranged on a mounting base, a driving assembly is arranged on the mounting base, a base is arranged at the bottom of the mounting base, a rotating shaft is arranged on the mounting base, and the rotating shaft is connected with the driving assembly. The rotating shaft is rotationally arranged on the base, and an adjusting assembly is arranged on the base. The utility model has the advantages that the inclination angle of the to-be-processed workpiece can be adjusted after the to-be-processed part is fixed, so that the to-be-processed part can be better machined.

The utility model discloses an internal expansion turning clamp device for achieving the lathe function of a machining center. Comprising an oil cylinder driving mechanism, a pull rod loosening mechanism, a tool apron mechanism and an internal expansion turning product tool. The oil cylinder driving mechanism is installed at the top of the pull rod loosening mechanism and used for pressing the pull rod loosening mechanism downwards, the bottom end of the pull rod loosening mechanism is provided with the internal expansion turning product tool, a product is internally expanded, supported and fixed by the internal expansion turning product tool, the tool apron mechanism is located below the internal expansion turning product tool, cutters are arranged in the tool apron mechanism, and the cutters face the lower portion and the side of the product respectively. The utility model designs the device for realizing the turning function of the machining center, so that the efficiency can be improved, and the cost can also be saved.

The utility model relates to the field of expansion clamps, in particular to a graphite expansion clamp which comprises a long taper shank, a connecting base is fixedly connected to the upper side of the long taper shank, a graphite elastic opening expansion clamp body is arranged on the upper side of the connecting base, and a metal slope block is arranged on the inner side of the graphite elastic opening expansion clamp body. Second threaded grooves are formed in the upper side of the long taper shank and the upper side of the connecting base, an adjusting mechanism is arranged between the connecting base and the graphite elastic opening expansion clamp body and comprises a lead screw fixedly connected to the upper side of the connecting base, a fixing plate is arranged on the lower side of the graphite elastic opening expansion clamp body, and a threaded block is rotationally connected to the lower side of the fixing plate. When the threaded block rotates, the threaded block can move up and down through the threaded connection between the threaded block and the lead screw, and the height of the graphite elastic opening expansion clamp body and the height of the metal slope block are adjusted through the connection between the threaded block and the fixing plate.

The utility model relates to the technical field of beveling machines, in particular to a pipeline end face beveling machine. The problem that in the prior art, a handheld beveling machine is difficult to machine a pipeline with the machining face pipe opening diameter smaller than the inner pipe diameter of the pipeline is solved, and the practicability of equipment is improved. The device structurally comprises a fixing seat, a fixing shaft is fixed to the fixing seat, a fixing mechanism used for tensioning and fixing the fixing seat from the interior of a to-be-beveled pipeline is arranged on the fixing shaft, and a control structure used for controlling the fixing structure to fix the to-be-beveled pipeline or break away from the to-be-beveled pipeline is further arranged on the fixing shaft. A beveling assembly used for beveling the pipeline to be beveled is further arranged on the fixing base, and a driving assembly used for driving the beveling assembly is further arranged on the fixing base. The pipeline machining device can machine a pipeline with the diameter of a machining face pipe opening smaller than the diameter of an inner pipe of the pipeline, and has high practicability.

The invention belongs to the technical field of heat transfer pipe inner hole clamping mechanisms, and discloses a heat transfer pipe inner hole clamping mechanism capable of being quickly replaced, which comprises a clamping jaw module, a driving module and a clamping jaw mounting seat, the clamping jaw module is provided with a clamping jaw shell, a clamping jaw, a sliding block sleeve, a sliding block inner column and a clamping jaw baffle block; the driving module is provided with a lifting air cylinder, a telescopic air cylinder, a tensioning air cylinder and a tensioning air cylinder bottom cover, the telescopic air cylinder is arranged in the lifting air cylinder and can move up and down, the tensioning air cylinder is arranged in the telescopic air cylinder and can move up and down, the tensioning air cylinder bottom cover is installed below the tensioning air cylinder, the tensioning air cylinder is provided with a tensioning piston, and the tensioning piston is used for pushing the sliding block inner column. The clamping jaw module is installed on the clamping jaw installation base, and the clamping jaw installation base is connected with the tensioning air cylinder. The robot can adapt to heat transfer pipes with different hole diameters, multiple actual working conditions such as fixed installation and passive rotation are supported, and the clamping reliability, adaptability and maintenance efficiency of the steam generator heat transfer pipe maintenance robot in the complex environment are improved.

The invention belongs to the field of aero-engine manufacturing, and discloses a precision turning tool and method for machining a shell bearing assembly with a coating, the precision turning tool comprises a rotary base and an annular wedge block, the rotary base specifically comprises a clamping cylinder, a split type cylinder and a taper hole, rapid end face fitting positioning of the tool and the shell bearing assembly is achieved through a threaded hole, and the annular wedge block is arranged on the rotary base; and the adjusting screw is used for driving the annular wedge block to be pressed into the taper hole, so that the split type cylinder generates radial expansion, and a tensioning structure is formed. By the adoption of the tool, equipment dependence is remarkably reduced, the requirement for precise turning of the coating can be met without a high-precision machining center and a common numerical control lathe, efficiency is greatly improved, single-piece complex alignment is omitted, rapid batch clamping and positioning of shell assemblies are achieved, the numerical control lathe widely existing in common workshops has the high-precision machining capacity, and the cost is reduced. And production restriction caused by shortage of expensive special equipment is avoided.

The invention provides a radial and axial expandable core rod, which belongs to the field of mechanical engineering and comprises a first radial expansion module, a second radial expansion module, an axial expansion module and a driving module. A motor is fixed in a motor base groove of the driving module, a center shaft of the axial expansion module is in interference fit with a coupler and a lead screw, and the coupler is connected with a motor output shaft and the center shaft. The first radial expansion module is connected with the rear end shell through a nut mounting seat, a first bracket, a second rotating frame and a first transmission module; the second radial expansion module is connected with the front-end shell through the first rotating frame and the second transmission module, and the front-end shell is in axial sliding fit with the rear-end shell. A pin column sequentially penetrates through a coupler, a motor output shaft, a center shaft, a lead screw and corresponding hole positions of the first rotating frame, and driving of all the modules is achieved. According to the core rod, the front-end shell and the rear-end shell can be driven by the motor to independently complete axial or radial expansion and can also be expanded at the same time, universality and adaptation flexibility are both considered, and the production efficiency can be improved.

The application discloses a limiting gear expansion sleeve clamp, which comprises a clamping body, a pull rod and an expansion sleeve, the expansion sleeve is fixedly connected with the pull rod, a tapered head is formed on the upper end of the clamping body, the expansion sleeve is sleeved outside the tapered head and the two are matched through a taper surface, and the limiting gear expansion sleeve clamp further comprises a lower supporting seat used for abutting against and supporting the lower end surface of a workpiece and an upper pressing seat used for abutting against and pressing the upper end surface of the workpiece, the upper pressing seat and the lower supporting seat are both hollow; a stepped surface is arranged below the tapered head of the clamping body, the lower supporting seat is sleeved on the stepped surface and detachably connected with the stepped surface; a plurality of limiting columns are further protruded on the upper end surface of the lower supporting seat, a plurality of limiting grooves are correspondingly recessed on the lower end surface of the upper pressing seat, the limiting columns penetrate through the workpiece and are inserted into the limiting grooves; and the expansion sleeve is located in a cavity enclosed by the upper pressing seat and the lower supporting seat, and the upper end of the expansion sleeve does not expose the upper pressing seat. The structure is more stable in clamping and positioning and can play a good protection role and effectively prevent the entry of waste chips.

The invention relates to the technical field of wind power gear box precision machining, and discloses a wind power gear box precision machining device which comprises a stand column, a main shaft system is arranged at one end of the stand column, two sets of supporting columns are arranged at one end of the stand column, positioning discs are arranged in the two sets of supporting columns, and bases are arranged at the output ends of the positioning discs. An equal-force surrounding mechanism is arranged on one side of the top end of the base, the rolling shaft is arranged at the top end of the limiting plate, a first motor is arranged at the top end of the base, and the output end of the first motor is sleeved with an expansion mandrel mechanism. Initial clamping stress is eliminated through three-point kinematics supporting, the double-hole expansion mandrel establishes a unique main axis with a bearing hole as the benchmark, coaxiality is guaranteed from the source, clamping force is evenly distributed around the benchmark axis through surrounding pressure-equalizing clamping, thin-wall deformation is completely eradicated, the benchmark penetrates through the whole process through overall rotation turning, re-alignment is not needed after turning, and the machining precision is improved. And through the synergistic effect of the four innovations, the machining precision and efficiency are remarkably improved.

The invention relates to the technical field of workpiece positioning, in particular to a teleoperation tool tensioning mechanism. According to the technical scheme, a rotating machine head is arranged at the top end of a supporting frame, and a cable rack is arranged on one side; a verification manual pin is arranged on the frame through a slide block and a slide rail, and the tail end is connected with a T-shaped handle; two symmetrically distributed tightening mechanisms are arranged on the frame; side modules are symmetrically distributed on the two sides and comprise push plates, profiling blocks and first driving units, and the first driving units drive the push plates to slide so that the profiling blocks can be attached to the workpiece; the tightening mechanism is provided with a second driving unit, a transmission unit and an expansion unit. The second driving unit enables the expansion unit to be clamped into the pressing sleeve through the transmission unit. The clamping force of the profiling block and the expansion unit is used for limiting, and the verification manual pin is inserted into the verification hole to verify workpiece installation. Through cooperation of multiple mechanisms, efficient and accurate positioning, tensioning and fixing of workpieces are achieved, the assembling efficiency and quality are improved, and remarkable practical value and popularization prospects are achieved.

The application discloses a kind of automatic alignment and force increasing support, piston end cover is threadedly connected with the bottom of thrust piston, the upper inner cavity of piston end cover is equipped with return spring, the top of return spring is equipped with end stop seat, the top of end stop seat is equipped with clamping sleeve and steel ball, support rod is installed in piston end cover and clamping sleeve, support rod is located in return spring, the top of support rod is threaded and connected with support cap, the bottom of support cap is equipped with ejector spring, the bottom of ejector spring is equipped with ejector spring seat, ejector spring seat is threadedly connected with the top of lifting piston, return spring is sleeved on lifting piston, return spring is located in the lower inner cavity of piston end cover.The application can use lifting piston to increase the force of thrust piston, realize maximum thrust in limited space;Clamping sleeve is designed to be convex on the outside and concave on the inside, which can compensate the wire clamping phenomenon caused by processing error, and play the role of automatic alignment and clamping.

Provided is a gripping method including: a phase matching step of matching tool relief grooves of a contact metal member and track grooves of a constant velocity universal joint component with each other in phase; a measuring step of measuring phase differences between the track grooves of the constant velocity universal joint component and a female spline of the constant velocity universal joint component; a matching step of matching, based on a result of the measuring step, a stopper with a recessed portion of the female spline having the smallest phase difference and gripping the constant velocity universal joint component by a collet chuck. Under a state in which the constant velocity universal joint component is gripped by the collet chuck, the contact metal member holds the constant velocity universal joint component.

The invention discloses a machining technology of a precise deep hole part. The machining technology comprises the following steps that S10, blanking is conducted; s20, solid solution aging; s30, roughly turning an outer circle and chamfering; s40, a middle hole is drilled through a gun; s50, roughly turning the appearance; s60, stress relief aging is carried out; s70, roughly turning the outer circle; s80, the small end is subjected to semi-finish turning; s90, the large end is subjected to semi-finish turning; s100, honing an inner hole; s110, the outer circle is finely ground; and S120, the two ends are subjected to finish turning, and the precise deep hole part is obtained. Compared with the prior art, the technology has the following beneficial effects that 1, the technology is adopted for machining, and the requirement for the coaxiality of 0.02-0.03 of the outer circle of a deep hole in a drawing can be met after machining; 2, the coaxiality of the center hole and the outer circle after gun drill machining can be effectively rectified by adopting the expansion sleeve clamp to roughly turn the outer circle, the subsequent outer circle grinding allowance is reduced, and the machining efficiency is improved;

A spindle assembly (4) may be used with a rotary power tool (1) to provide a reliable and stable connection between the rotary tool (1) and a tool attachment (2). The spindle assembly (4) provides a quick-connect / quick-release connection between the tool output shaft and the accessory (2) via a clamping action. In particular, the mandrel assembly (4) is operable to clamp an accessory (2) between a resilient gripper jaw (96) protruding from one end of a mandrel (50) and a sleeve (10) surrounding the mandrel (50) and spring biased away from a first end (51) of the mandrel.

The utility model provides a thin-wall part clamping device which comprises a supporting assembly and an ejector rod, the supporting assembly comprises a sliding block, and the sliding block is connected with the ejector rod in a sliding mode. The clamping device further comprises an expansion mold column, a supporting ring is installed on the step face of the expansion mold column, and the supporting ring is in clearance fit with the expansion mold column. The ejector rod moves in the axial direction of the expanding mold column after being inserted into the expanding mold column, and the supporting assembly is outwards supported to the inner wall of the supporting ring so as to clamp the thin-wall part. The thin-wall part is placed in the clamping device in the axial direction of the expanding mold column, so that the end face of the thin-wall part abuts against the supporting ring, and the supporting ring plays a role in supporting the thin-wall part. The ejector rod drives the sliding block to move, the supporting assembly is outwards supported to the inner wall of the supporting ring, at the moment, the supporting assembly stops outwards supporting, the supporting assembly is tightly matched with the thin-wall part, the thin-wall part is clamped, and the thin-wall part is axially limited, so that the situation that the supporting assembly is outwards supported excessively, and consequently the thin-wall part is deformed is prevented; and clamping devices of different models can be rapidly switched.

The invention belongs to the technical field of machining positioning devices, and particularly relates to an expansion machining positioning device for thin-walled cylindrical parts, which comprises a positioning cylinder, a support rod and a push slider, and the support rod is arranged in the positioning cylinder and slidably connected with a support plate in the positioning cylinder; the number of the pushing sliding blocks is three, the three pushing sliding blocks are all connected with the positioning cylinder in a sliding mode, the supporting rod is fixedly connected with a conical pushing disc, and the bottoms of the pushing sliding blocks are provided with inclined faces matched with the conical pushing disc. At least two inner supporting sliding blocks are connected to the positioning cylinder in a sliding mode. The inner supporting sliding block slides in the radial direction of the positioning cylinder. A pushing piece is arranged on the supporting rod and makes contact with the inner supporting sliding block. The positioning cylinder is provided with a liquid outlet hole, the supporting rod is provided with a first flow channel, and the conical push disc is provided with a second flow channel. Uniform expansion type supporting is achieved from the interior of a part through the inner supporting sliding block, the problems of local stress concentration and deformation caused by direct clamping of a three-jaw chuck are effectively solved, and the clamping rigidity and the machining precision are remarkably improved.

The invention relates to the technical field of machining, in particular to a double-part product automatic centering jig and a working method thereof. The automatic centering jig comprises a base, four supporting columns, a base plate, a backing ring, a centering sleeve, an expansion sleeve, a connecting rod and a driving cylinder. The base, the four supporting columns and the base plate form a supporting platform, and the driving cylinder is installed. The backing ring positions the part; one end of the connecting rod is connected with the output end of the driving cylinder, the other end of the connecting rod is connected with the expansion sleeve, the centering sleeve is arranged in an inner hole of the part, and the expansion sleeve drives the centering sleeve to open and close to automatically center the part. A part is directly and automatically centered to be machined, the part with the special-shaped appearance is installed on the jig, meanwhile, the part is automatically centered and aligned through the expansion sleeve and the centering sleeve through pressurization, the appearance and an inner hole of the part are completed through one-time clamping and one-time machining, no deviation exists, the profile tolerance meets the requirement, and the machining efficiency is greatly improved. The automatic centering jig is suitable for various parts with special-shaped inner holes and shapes, is simple to operate, is a universal automatic centering jig, and reduces the cost.

This application relates to the technical field of submarine communication. An expanding structure for a cylinder internal unit 200 and a cylinder internal unit 200 are provided. The expanding structu

The invention discloses an internal expansion type numerical control lathe fixture for a thin-walled cylinder workpiece. The internal expansion type numerical control lathe fixture comprises a chuck body, a fixture body, a positioning cover, an expansion sleeve, a locking block and a locking wrench, the other end of the chuck body is connected with the clamp body; the positioning cover is connected with the clamp body, and the outer surface of the positioning cover makes contact with the outer surface of a workpiece to achieve workpiece positioning. The expansion sleeve is in conical fit with the clamp body, and the expansion sleeve expands to enable the outer surface of the expansion sleeve to make contact with a workpiece so as to abut against and clamp the workpiece; the locking block is connected with the expansion sleeve, the locking block is in threaded connection with the clamp body, and the expansion sleeve is controlled to be expanded and shrunk through rotation of the locking block; and the locking wrench is connected with the locking block. The expansion sleeve is matched with the conical surface of the clamp body, expansion of the expansion sleeve is controlled through threaded connection of the locking block, the thin-wall cylindrical workpiece is clamped by the expansion sleeve, the deformation of the part is reduced, the form and location tolerance of the part is guaranteed, the problem of machining vibration of the thin-wall workpiece is solved, and the machining efficiency and the machining quality of the part are greatly improved.

This invention relates to the field of corrugated pipe manufacturing technology, and in particular to a pipe end trimming device for corrugated pipe production. The device includes an inner support shell, on which an end-processing mechanism for treating the corrugated pipe ends is mounted via a rotary telescopic mechanism. An adjusting support mechanism is also located within the inner support shell to adjust the support according to the corrugated pipe specifications. This invention adapts to different specifications through the adjusting support mechanism. The execution component in the end-processing mechanism can switch between execution and rest positions under the control of the drive component. The positioning component, through the cooperation of the positioning rod with the linkage hole and through hole, not only rigidly positions the execution block but also simultaneously locks the external processing component through the locking hole of the connecting frame. This effectively prevents the external processing component from shifting position due to vibration or stress during the trimming process, ensuring the stability and consistency of the internal and external trimming processes.

The gearbox body production equipment is applied to the technical field of gearbox manufacturing, the two ends of the top of a machining platform are fixedly connected with a left support and a right support correspondingly, an overturning shaft pipe is movably connected between the left support and the right support, and the middle of the overturning shaft pipe is movably connected with a rotating shaft; a fixture assembly plate is fixedly connected to the outer portion of the rotating shaft, the gearbox body is placed through the fixture assembly plate, the positioning shaft die cylinder penetrates through a main shaft hole in the gearbox body for positioning, then a rotating wheel in the positioning shaft die cylinder is operated for rotating adjustment, and outward pressure is applied to the abutting shaft through an arc-shaped groove. When a main shaft hole is formed, the ejection module is pushed to expand outwards to expand and clamp the main shaft hole, meanwhile, the positioning shaft mold barrel positions the gearbox body, then the gearbox body clamp is matched to simply clamp and fix the outer portion of the gearbox body, the fixing mode of the gearbox body is simple, the usage amount of clamps is effectively reduced, more universal clamps are convenient to use, and the use efficiency of the clamps is improved.

The utility model discloses a clamp for turning a central hole and an outer circle, which belongs to the technical field of turning clamping tools, and is provided with a clamp main body of which the bottom end is fixedly connected with a vertical lathe main shaft, and pressing rods which can vertically stretch out and draw back to provide downward pressing force to press a workpiece are distributed in the circumferential direction of the clamp main body, the top of the clamp body can be arranged in an inner cavity of the workpiece, a plurality of anti-vibration blocks capable of swinging around a horizontal shaft are evenly distributed on the outer wall of the clamp body in the circumferential direction so that the clamp body can rotate along with a spindle of the vertical lathe, and the tail ends of the anti-vibration blocks abut against the inner wall of the workpiece to tension the workpiece under the action of inertia force. The frequency changing function is achieved, the cutter vibration phenomenon in the turning process is eliminated, and the frequency changing device has the advantages of being reliable in clamping, accurate in positioning and beneficial to improving the machining quality of workpieces.

The utility model relates to the technical field of pump tools, and provides a split type expansion sleeve tool which comprises a flange connecting piece and an expansion sleeve body which are sequentially connected in the axial direction. The expansion sleeve main body comprises a main body connecting part connected with the flange connecting piece and a mounting part extending out from the first end of the main body connecting part, and a central connecting hole penetrating through the mounting part is formed in the center of the expansion sleeve main body; a cone frustum is arranged at the top end of the mounting part; the expansion sleeve is provided with a cone frustum hole matched with the cone, and the installation part is coaxially sleeved with the expansion sleeve; the expansion sleeve is provided with an expansion opening groove, the expansion opening groove is communicated with the cone frustum hole, the expansion opening groove axially extends by a first preset distance from one end, close to the main body connecting part, of the expansion sleeve, and the first preset distance is smaller than the axial length of the expansion sleeve; a fastening mounting hole which is coaxial and communicated with the central connecting hole is formed in the expansion sleeve; and the tensioning piece is arranged in the fastening mounting hole in a penetrating manner and is connected with the central connecting hole.