55results about How to "Achieve peace of mind" patented technology

The invention relates to a robot for cleaning and detecting pipes. The robot comprises a mechanical system and a control system. The mechanical system is provided with a moving trolley and a cleaning operation device positioned on the trolley; the tail part of the moving trolley is provided with a detection device and a positioning guiding device, the detection device is a camera (1) and the positioning guiding device is a device capable of causing the trolley to advance in parallel; and the cleaning operation device comprises a cleaning arm (15), a cleaning arm lifting mechanism positioned at the front of the moving trolley, a cleaning arm opening-closing mechanism positioned on a second operating platform (14) and a cleaning brush mechanism positioned at the front end of the cleaning arm, the cleaning brush mechanism is provided with four small brushes (23) and a pressure sensor (22), and various small brushes are always in close contact with inner walls of the pipes by synchronous detection and feedback adjustment of the pressure sensor. The robot has the advantages of large effective working area, being capable of cleaning off a plurality of pollutants, no whipping and low cost, and being suitable for cleaning operation of a plurality of round pipes including pipes with changing pipe diameters and being capable of prolonging service life of the pipes.

Provided is a method for centering and positioning a self-centering positioning chuck and a semiconductor wafer. The self-centering positioning chuck comprises a tray, a positioning assembly, a center absorption assembly and a chuck shell, wherein the tray is radially provided with telescopic rods capable of freely stretching and retracting axially, and a needle air cylinder communicated with an air source acts on the telescopic rods through a taper-face shaft so that the telescopic rods can stretch; the middle sections of the telescopic rods are sleeved with springs with a pushing function, and the telescopic rods retract and clamp the wafer under the action of the springs for centering; a sucker is arranged in the center of the tray and can rise or rotate; a clamping block can clamp and release the wafer so that the wafer can be centered; a sensor measures the positioning opening in the outer edge of the wafer for positioning the wafer. The invention provides a device for self-centering and positioning of the semiconductor wafer. The device can be applied to equipment for detecting chips in the IC industry, and can be applied to equipment for processing the wafer.

The invention provides a centering clamping apparatus of an ellipsoidal workpiece, which belongs to the technical field of a clamping device. The centering clamping apparatus comprises a screw, a left slide block, a right slide block, a left centering clamping assembly, a right centering clamping assembly, a height adjusting assembly and a return assembly, wherein both the left slide block and the right slide block can be arranged on a guiding seat in a sliding manner, a left threaded section of the screw is connected with the left slide block in a threading manner, a right threaded section of the screw is connected with the right slide block in a threading manner, a carrier frame of the height adjusting assembly is arranged on a fixed seat in an up-down sliding manner by virtue of a guide rod and a guide column, a left centering clamping assembly and a right centering clamping assembly are symmetrically arranged at the left side and the right side of the height adjusting assembly, the lower end of a left leaf spring of the return assembly is installed on a left supporting frame by virtue of a left nail, and the upper end of a right leaf spring is inserted into a right clamping groove of a right centering pressure rod. The centering clamping apparatus not only rapidly centers and clamps the ellipsoidal workpiece and is reasonable in structure, but also can be suitable for various models of ellipsoidal workpieces, and is high in universality.

The invention relates to a pneumatic brake cylinder comprising a housing (19), a piston (1) that can be moved in the housing (19) and is used to transfer the pneumatic pressure to a brake, and a device for automatic adjustment in the event of wear of the brake linings, said device comprising a spindle (24), an adjusting nut (25), and a piston tube (23) that can be engaged with the adjusting nut (25). According to the invention, a torque applied to the piston tube (23) by the adjusting nut (25) is introduced by the piston tube (23) directly into elements (8) connected to the housing (19) in a fixed manner.

The invention discloses a three-jaw manipulator formed by three crank-slider mechanisms. The three crank-slider mechanisms are equidistantly and circumferentially distributed on a mother disc and share a crank, each crank-slider mechanism is composed of a finger slider, a connecting rod, a mother disc and a turntable, the finger slider of one of the crank-slider mechanisms is connected with an air cylinder through which opening and closing of fingers are realized, and three fingers can simultaneously slide centripetally or centrifugally and can realize centering of cylindrical workpieces.

The invention provides a pinion assembling tray and a pinion assembling device, which can assemble a pinion to a planet carrier for operation with high efficiency so as to raise assembling productivity. The pinion assembling device (60) is composed of a conveyor (61) for conveying a pinion assembling tray (30) and a first station (S1), a second station (S2) and a third station (S3) configured along the conveyor (61). At the first station (S1), a pinion module is inserted into the planet carrier and moves, is inserted into a shaft at the second station (S2) and is in pivot joint with the shaft at the third station (S3). The pinion assembling device can independently perform pinion module positioning and shaft inserting, shorten a period and increase productivity.

The invention provides a centering and clamping device for a bobbin, which belongs to the technical field of textile machinery. It includes a wedge and a wedge support rod, the wedge support rod can be slidably arranged on the guide seat, one end of the piston rod of the clamping cylinder is connected to the wedge support rod, and the first clamping roller of the first clamping assembly can be rotatably set At the other end of the first support rod, the middle end of the first swing rod of the second clamping assembly is swingably arranged on the supporting support through the first support shaft, and the second clamping roller is rotatably arranged on the first swing rod. At the other end, the middle end of the second swing rod of the third clamping assembly is swingably arranged on the supporting base through the second support shaft, and the third clamping roller is rotatably arranged at the other end of the second swing rod, and the first roller Under the action of the first spring, the roller is always attached to one inclined surface of the wedge, and the second roller is always attached to the other inclined surface of the wedge under the action of the second spring. The invention automatically realizes the centering of the bobbins during the clamping process, is beneficial to the feeding of the bobbins, and has a reasonable structure.

The invention relates to a constant support (1) for moving loads, especially pipelines and similar. Said constant support (1) comprises a fastening part (2), a load-bearing part (3), and a spring system (4) which is located between the fastening part (2) and the load-bearing part (3) to generate a constant bearing strength. The spring system (4) is provided with a main spring assembly (9) absorbing the load and a device (K) for compensating changing pressures of the main spring assembly (9).

The invention relates to an automobile bearing self-control oil injection device. The automobile bearing self-control oil injection device comprises a rack. The rack is composed of a workbench, an oilinjection supporting rod, an oil injection arm, a supporting rod, a pipeline supporting plate and an air cylinder backup plate. An oil bucket installing hole is formed in one side of the rack, and anoil bucket is supported through a supporting plate; and a bearing fixing hole is formed in the other side, a bearing is fixed through a rotation shaft and a conical pressing disc, and a stepping motor is arranged below the workbench and connected with the bearing through a coupler. An oil injector is provided with a pneumatic oil pressing mechanism and a stroke control mechanism, the stepping oilpressing function is achieved through an electromagnetic valve and an air cylinder, and the oil pressing mechanism is connected through an oil path pipeline. A core component of the shown device is arranged in a control box, and self-control running of the oil injection device is achieved through PLC system programming. According to the designed bearing self-control oil injection device, the oilinjection work efficiency is obviously improved, the product size is small, operation is simple, the production cost is low, and practicability is high.

The invention relates to a floating positioning and torque transmission structure of a turbine guide device, and is applicable to the field of ground combustion gas turbines, aero-engines and the like. An air baffle structure capable of sealing a rim of a turbine rotor blade is added to a front cavity of a turbine disk, a positioning rib structure is arranged on the air baffle structure, a floating positioning bulge is arranged on the turbine guide device in a matched manner, floating positioning and torque transmission of the turbine guide device are realized by the aid of the positioning riband floating positioning bulge structure, the expansion deformation constraint of the turbine guide device in the hot-state working environment is reduced to the maximum extent, and the hot stress ofthe guide device is reduced. The structure has great engineering application significance in prolonging of the life of the high-pressure turbine guide device of a ground combustion gas turbine or anaero-engine. Compared with traditional high-pressure turbine guide device structures and turbine disk front cavity baffle structures, the structure has the advantages that through the ingenious structural design, centered torque transmission of the high-pressure turbine guide device and high-efficiency rim sealing of rotor and stator end areas of a high-pressure turbine can be realized.

The invention belongs to the field of workpiece clamping devices, and particularly relates to a gear shaping clamp for a flange of a transmission. The gear shaping clamp comprises a machine frame, a linkage device and a clamping device; a positioning disc is fixedly arranged on the machine frame; a positioning spigot is formed in the positioning disc; the linkage device comprises a supporting rod,a cross rod, V-shaped shifting rods and push rods; a base plate is arranged at the upper end of the supporting rod and is connected in the positioning spigot in a sliding mode; a wedge groove is formed in the cross rod; clamping grooves are formed in the push rods; one ends of the V-shaped shifting rods abut against the cross rod, and the other ends of the V-shaped shifting rods are clamped in the clamping grooves in the push rods; a pressing plate is arranged at the upper ends of the push rods; the clamping device comprises piston cylinders and a clamping block; the piston cylinders are arranged at the bottom of the positioning spigot and communicates with the positioning spigot; wedge surfaces are arranged the piston rods, and the piston rods are fixedly connected to the push rods; andwedge rods are fixedly connected to the clamping block and abut against the piston rods. The gear shaping clamp has the advantages that the purpose of preventing displacement in the machining processof inner teeth of the flange can be achieved, and the gear shaping clamp is mainly used for fixing the flange in the machining process.

The invention discloses an automobile transmission shaft length detection device with an elastic element. The automobile transmission shaft length detection device comprises a base, a sliding rail, a fixed plate, a movable plate, cylinder clamping devices, the elastic element, a motor driving device, a force sensor and a supporting device. The sliding rail is fixed to the upper portion of the base and provided with the fixed plate and the movable plate, the fixed plate is fixed to one end of the sliding rail, the bottom of the movable plate is provided with a sliding block matched with the sliding rail, and the motor driving device is fixed to the sliding rail. The elastic element is fixed to the bottom of the movable plate, one end of the force sensor is connected with a motor head connected with the motor driving device, and the other end of the force sensor is connected with the elastic element. The upper portion of the fixed plate and the upper portion of the movable plate are provided with the cylinder clamping devices for clamping the two ends of a to-be-measured automobile transmission shaft, and the supporting device is arranged on the sliding rail between the fixed plate and the movable plate. The problem that an ordinary motor cannot guarantee force stability in the automobile transmission shaft length detection process is solved, the accuracy of measurement results is improved, and the production cost is reduced.

The invention is suitable for the technical field of pipe fitting welding, and provides a pipe fitting welding stable butt joint device which comprises a device base and further comprises a moving mechanism, the moving mechanism comprises a first moving assembly and a second moving assembly, the first moving assembly is connected with a clamping mechanism, and the second moving assembly is connected with a lifting rotating mechanism; the lifting and rotating mechanism is fixedly connected with the centering mechanism; and the centering mechanism comprises a centering seat, a power piece, a second transmission module, a first rotating piece, a driving seat, a first threaded shaft, a centering assembly, an abutting piece and a limiting seat. According to the stable butt joint device for pipe fitting welding, through the moving mechanism, the lifting rotating mechanism, the clamping mechanism and the centering mechanism, centering butt joint of two sets of pipe fittings can be achieved, the central axes of the two sets of pipe fittings coincide, the perpendicularity of the pipe fittings after welding is guaranteed, the welding quality and efficiency of the pipe fittings are improved, and the production rejection rate of the pipe fittings is reduced; and the production economic cost is saved.

The invention discloses a ceramic-based flame tube positioning structure, and belongs to the technical field of aero-engines; the ceramic-based flame tube positioning structure comprises a flame tube head integrally formed with an inner ring of a flame tube; the flame tube head comprises a flange arranged on the outer edge of the flame tube head and a concave spigot close to the flange; the inner ring of the flame tube comprises a small bent pipe; an annular groove is formed in the tail end of the small bent pipe; the inner ring of the flame tube is in lap joint with a combustion chamber inner case through the annular groove; a plurality of positioning pins are circumferentially and uniformly distributed on a combustion chamber outer case; a plurality of positioning pin seats matched with the positioning pins are uniformly distributed on the ring surface of an outer ring of the flame tube and are used for supporting the flame tube. In the working state, through the reserved gap between the positioning pin and the hole bottom of the positioning pin seat and the gap of the annular groove, the space requirement needed by thermal expansion of the positioning pin, the combustion chamber inner case and an outlet supporting ring can be met. No matter in a cold state or a hot state, the combustion chamber inner case and the outlet supporting ring can also play a role in auxiliary support on the wall surface of the flame tube.

The invention discloses a flange plate producing and machining device for pipe fitting connection. The device comprises a top plate and a working platform, the top of the working platform is provided with an inner diameter clamping mechanism for centering a flange plate, the inner diameter clamping mechanism comprises an annular mounting cylinder, the annular mounting cylinder is fixedly connected to the top of the working platform, the annular mounting cylinder is in a hollow pipe shape, a plurality of mounting grooves are formed in the outer wall of the annular mounting cylinder in a circumferential array penetrating mode, sliding blocks are slidably connected to the inner walls of the mounting grooves, and a pressure plate is connected to the inner wall of the annular mounting cylinder in an up-down sliding mode. Through cooperation of the above structures, the device achieves the function of fixing and clamping flange plates with different inner diameters and different heights, can drill positioning holes in the flange plates in a circumferential equally-divided mode, and can adjust the drilling position of a drilling machine according to the inner diameters of the flange plates, so that the drilling requirements of positioning holes of the flange plates of different specifications are met.

The invention relates to a cylinder-shaped wood cutting device with a good effect. The cylinder-shaped wood cutting device comprises a base, a fixing plate, a fixing block, a first moving block, a second moving block, a locating rod, a clamping mechanism and a cutting mechanism. The cutting mechanism is arranged on the second moving block. The clamping mechanism comprises two clamping assemblies.The two clamping assemblies are arranged on the fixing block and the first moving block correspondingly. According to the cylinder-shaped wood cutting device with the good effect, centering and clamping of wood are achieved through the clamping mechanism, and cutting of the wood is achieved through the cutting mechanism. Compared with an existing clamping mechanism, the clamping mechanism adopts flexible clamping, the situation that due to rigid clamping, damage to the surface of the wood is caused is avoided, by adjusting the position, the clamping mechanism achieves the good effect of clamping the wood of different sizes, meanwhile, the two clamping assemblies carry out separated centering and clamping on the two end portions of the wood, the good effect of clamping the wood with the different diameters of the two end portions is achieved, the cutting precision is also improved, and practicality is improved.

The invention discloses a method and device for measuring the length of an automobile transmission shaft under constant pressure.The method comprises the steps that the two ends of the automobile transmission shaft to be measured are gently grabbed for centering at first to ensure that an axle tube of the automobile transmission shaft to be measured and the axis of a telescopic sleeve are located on the same straight line, an alternating current servo motor is operated in a torque mode, two limiting baffles on a fixed block and a movable block are driven to compress the two end faces of the automobile transmission shaft to be measured, a magnetic railing ruler is utilized for measuring the distance between two reference faces making contact with the two end faces of the automobile transmission shaft to be measured, the length of the automobile transmission shaft to be measured under the set force value is obtained, and therefore whether the length of the automobile transmission shaft to be measured is qualified or not is judged.The device is simple and compact in mechanism, low in production cost, small in occupied area and accurate in measuring result.

The invention relates to a machine element (2) used for a shaft-to-hub connection (1), containing an un-notched tensioning / clamping element (8), which is inserted into a receptacle space of the machine element (2). The tensioning / clamping element (8) has an opening (7) for receiving a shaft (4) twistable relative to the machine element (2), a supporting sleeve (26) arranged radially external to the tensioning / clamping element (8). Therefore, the machine element (2) has the advantages of easy manufacture, excellent use and bearing large force.

The invention relates to a housing (CAS) having a longitudinal axis (AX) of a turbomachine (TM), the axis extending along a rotor (R), in particular to a turbocompressor housing, comprising at least one jacket part (SH) extending along the longitudinal axis (AX) and at least one end-face cover (COV), wherein said cover (COV) is surrounded by the jacket part (SH) at least with a part of the axial extension of the cover. In order to reduce the need for radial clearance, without compromising the availability or safety of the operation of the machine, the cover (COV) has radial clearance (RCL) with respect to the jacket part (SH) and at least two separate guide elements (GE) of the cover (COV) are provided on the jacket part (SH) in two different circumferential positions with respect to the longitudinal axis (AX), wherein the respective guide elements (GE) are designed such that they block a respective movement of the cover (COV) in the circumferential direction at least unidirectionally.

The invention discloses an aerospace-grade germ fiber solid beverage, and relates to the technical field of solid beverages. The aerospace-grade germ fiber solid beverage is prepared by the following steps: deodorization of wheat germs: putting pretreated germs into a deodorization tank, applying 0.1-0.15 MPa of high-pressure steam, and instantly releasing the pressure after 3-10 minutes; preparation of a stabilizer: taking 1 part of algal acid propylene glycol ester, 1 part of CMC-Na and 1 part of xanthan gum by weight, and then uniformly stirring and mixing the algal acid propylene glycol ester, the CMC-Na and the xanthan gum to obtain the stabilizer; and mixing ingredients: uniformly mixing the sieved wheat germ with the prepared stabilizer, sequentially adding milk powder, royal jelly, lily powder, xylitol and table salt, and mixing at 600-800rpm to obtain the wheat germ solid beverage. The aerospace-level germ fiber solid beverage provided by the invention is more comprehensive in nutrition, and the brewed beverage is free of raw fishy smell, is deeply loved by people, and is not easy to layer and precipitate.

The invention discloses a solid beverage having effects of quieting the heart and soothing nerves and a making method of the solid beverage. The solid beverage is prepared from the following raw materials in parts by weight: 20-40 parts of armillaria mellea, 20-30 parts of poria cocos, 20-30 parts of parched wild jujube seeds, 15-20 parts of rhizoma polygonati odorati, and 1-3 parts of maltodextrin. The making method of the solid beverage comprises the following steps of performing extraction and concentration on the armillaria mellea, the poria cocos, the parched wild jujube seeds and the rhizoma polygonati odorati, merging extracts, uniformly mixing the merged extracts with the maltodextrin, performing wet granulation, performing low temperature drying and performing packing so as to obtain the solid beverage having effects of quieting the heart and soothing nerves. The prepared solid beverage has excellent efficacy of quieting the heart and soothing the nerves, and is high in content of effective components and easy to absorb and utilize after being taken orally. The composition is precise and appropriate in compatibility, the synergistic effect is elaborated and the drug effectactivity of the solid beverage is higher than that of single-taste raw materials.

The invention discloses a traditional Chinese medicine composition for treating insomnia, which is prepared from following raw material medicines, by weight: 6-15 parts of spina date seeds, 1.5-6 parts of schisandra chinensis, 10-20 parts of radix ophiopogonis, 6-12 parts of semen cuscutae, 6-15 parts of fructus ligustri and 6-15 parts of semen platycladi. The six raw material medicines can achieve a synergistic effect so that the traditional Chinese medicine composition has effects of quieting heart and quieting spirit, achieving sedation and hypnosis and nourishing and tonifying liver and kidney. The traditional Chinese medicine composition can be used for treating the insomnia and especially is suitable for treating the insomniac being old in age and deficiency in body.

The invention provides a hub centering and clamping device, and belongs to the technical field of automobile manufacture. The hub centering and clamping device comprises a supporting ring, three clamping jaws, a driving turntable and a pressing ring, a positioning pin is inserted into an upper pin hole and a lower pin hole, the supporting ring is mounted on a supporting base through a fastening screw, the pressing ring is fixed onto the upper side of the supporting ring, the driving turntable is rotatably arranged on the pressing ring, three arc-shaped driving fixture blocks connected end to end are arranged on the inner side of the driving turntable, the lower ends of the clamping jaws are hinged onto a clamping jaw supporting seat through clamping jaw pins, the outer sides of the upper ends of the clamping jaws are fitted with the driving fixture blocks on the driving turntable, the upper end of a compression spring is fitted with an upper spring groove, the lower end of the compression spring is fitted with a lower spring groove, a connecting plate is mounted on the driving turntable through a first screw, and an operation handle is mounted on the connecting plate through a second screw. The hub centering and clamping device can be used for rapidly centering and clamping hubs, facilitates accurate machining of the hubs and is reasonable in structure and low in cost.

The invention provides a copper bush press-in machine for a connecting rod. The copper bush press-in machine for the connecting rod comprises a loading transferring mechanism, a rotating feeding mechanism, a discharging transferring mechanism, a press-fitting mechanism and a copper bush conveying mechanism; the rotating feeding mechanism is mounted at the discharging outlet end of the loading transferring mechanism; the discharging transferring mechanism is mounted on one side of the rotating feeding mechanism and arranged opposite to the loading transferring mechanism; the press-fitting mechanism is mounted on one side of the rotating feeding mechanism and located between the loading transferring mechanism and the discharging transferring mechanism; and the copper bush conveying mechanismis mounted on one side of the press-fitting mechanism. The copper bush press-in machine for the connecting rod is compact in design and high in automation degree, through cooperation among the loading transferring mechanism, the rotating feeding mechanism, the discharging transferring mechanism, the press-fitting mechanism and the copper bush conveying mechanism, automatic feeding of the connecting rod and a copper bush, accurate press-fitting of the connecting rod and the copper bush and automatic discharging of the press-fitted connecting rod can be achieved, manual involvement is not needed in the whole process, compared with traditional manual press-fitting, stability is good, the more accurate and more scientific effects are achieved, and the working efficiency is improved greatly.

The invention relates to a machine to manufacture a man-made board, in particular to a centralizing device of a mechanical centralizing machine which can automatically centralize. The invention includes a left upright post, a right upright post, a connection crossbeam and a hydraulic cylinder device; the left upright post and the right upright post are respectively and fixedly connected with an upper chain wheel and a lower chain wheel; the upper chain wheel and the lower chain wheel are connected with each other by chains; the invention is characterized by being provided with an upper clipping log crossbeam and a lower clipping log crossbeam; the two ends of the upper clipping log crossbeam and the lower clipping log crossbeam are connected with the chains and are respectively contacted with the upright posts by guide wheels; the upper clipping log crossbeam and the lower clipping log crossbeam are respectively provided with a V-shaped iron; the upper clipping log crossbeam is connected with the hydraulic cylinder device arranged on the connection crossbeam; the V-shaped irons of the invention are fixed on the movable crossbeam; power are supplied by the hydraulic cylinder fixedly connected on the upper clipping log crossbeam; then the upper clipping log crossbeam and the lower clipping log crossbeam realize the synchronous subtended moving of the upper clipping log crossbeam and the lower clipping log crossbeam to centralize and locate the clipping log by the transmission of the chains of the chain wheels; the centralizing device of the invention has the advantages of saving time and labor when automatically centralizing, low cost, high efficiency and realizing the integral operations of centralizing, locating and clipping.

The invention discloses an electromagnetic expanding sleeve centering device and a using method. The electromagnetic expanding sleeve centering device comprises a centering device body, an electromagnet, a sliding body, a locating body, elastic valves, a limiting body and the like. Electromagnetic devices are fixed to the two ends of the centering device body respectively. Centering mechanisms are arranged between the two electromagnetic devices, wherein the centering mechanisms are symmetrically arranged on the centering device body and are identical in structure. The sliding body is connected with the locating body and arranged on the centering device body in a sleeving mode. The locating body is provided with a plurality of elastic valves capable of shrinking and expanding. The limiting body for limiting the locating body and the elastic valves is arranged on the portion, at one sides of the elastic valves, of the centering device body. The electromagnet is used as a core for controlling the locating mechanisms in a non-contact mode, on the premise of not influencing the locating precision, the mechanisms are simplified, the automatic centering function is achieved, and the centering device has the advantages of being easy to control, and convenient and fast to operate.

The invention belongs to the technical field of laser cutting, and particularly relates to an automatic laser cutting device and method for long and thin pipes. The automatic laser cutting device comprises a base, wherein a vertical plate, a mounting plate and a supporting rod are fixed to the top of the base, the mounting plate is located between the vertical plate and the supporting rod, and a top plate is arranged above the base; and the top of the vertical plate, the top of the mounting plate and the top of the supporting rod are fixedly connected with the top plate, a discharging hole is formed in the vertical plate, two horizontally-arranged horizontal plates are fixed to the side, close to the mounting plate, of the vertical plate, a horizontally-arranged pipe body is rotationally mounted on the mounting plate, and a rotating mechanism used for rotating the pipe body is arranged on the mounting plate. According to the automatic laser cutting device and method for long and thin pipes, a laser cutting assembly conducts circular motion and conducts circular rotation around the axes of pipes to cut the pipes, all the pipes are cut trustingly, the distances between the laser cutting assembly and the cutting peripheries of the pipes are the same, the cutting efficiency is greatly improved, electric operation is achieved, and the use quality is high.

The invention discloses a three-jaw manipulator formed by three crank-slider mechanisms. The three crank-slider mechanisms are equidistantly and circumferentially distributed on a mother disc and share a crank, each crank-slider mechanism is composed of a finger slider, a connecting rod, a mother disc and a turntable, the finger slider of one of the crank-slider mechanisms is connected with an air cylinder through which opening and closing of fingers are realized, and three fingers can simultaneously slide centripetally or centrifugally and can realize centering of cylindrical workpieces.