172results about How to "Guaranteed coaxiality requirements" patented technology

The utility model relates to an air-floated magnetic motive frictionless suspending device, comprising a frame, a mounting case, a mobile beam, a plurality of guiding bars, a main rod, an air floatation system and a magnetic motive system, wherein, the air floatation system comprises two frictionless cylinders and two air storage tanks of same size; the magnetic motive system comprises a moving coil with a long stroke and the iron core of a exciter; the mounting case is fixed in the middle part of the frame, and a lower mounting plate is positioned in the lower part of the frame; a top plate and a bottom plate are positioned on the mounting plate; two small air bearings for installing the guide bars and a large air bearing for installing the main rod are positioned on the top plate; a large air bearing for installing the guide bars is positioned below the bottom plate; two frictionless cylinders are positioned symmetrically above the mounting plate under the frame; the cylinder rod of the frictionless cylinder is connected with the mobile beam with a connecting hinge; the mobile beam comprises two symmetric parts; the main rod and two guide bars are positioned on the mobile beam; two stop plates are positioned on the two ends of the main rod. The utility model has advantages of meeting the frequency criterion under ultra-low frequency condition, little enough added mass, the small influence of the nonlinearity, and the high testing precision.

The invention discloses a method for machining circumferential taper holes in an irregular spraying pipe casing and a composite clamp thereof. The method includes the steps of 1) spraying pipe casing rough machining, 2) spraying pipe casing end face plane grinding, 3) spraying pipe casing semi-finish machining, 4) machining of small end taper holes of the spraying pipe casing, 5) machining of outer taper holes of the spraying pipe casing and 6) position accuracy detection of the circumferential taper holes. The special composite clamp is adopted, a strict clamping and alignment method is adopted to machine the taper holes in the spraying pipe casing, machining accuracy is high, and batch quality is stable. Alignment is required to be conducted only when a taper hole at the first position is machined, the following taper holes are machined in a location mode directly by adjusting a location disc, and the machining efficiency is improved. The space size of the taper holes is ensured through the composite clamp, location accuracy is high, and the requirement of products for space size accuracy can be completely met.

The invention relates to a self-aligning spherical plain water lubricated tail bearing for ships. The tail bearing is provided with two rubbing pairs, wherein an inner ring (9) and an outer ring (4) are a rubbing pair in spherical contact and are lubricated by grease; the inner ring (9) is provided with linings (7) and is fixedly connected with the linings; the linings (7) and a tail shaft (8) are a rubbing pair and are lubricated by water; and when the tail shaft (8) runs in the linings (7), the inner ring (9) automatically regulates the axis of the bearing along with the shift of the tail shaft (8) to ensure the requirement for coaxiality of the tail shaft (8) and the tail bearing and uniform distribution of pressure on the linings (7). The invention has the function of regulating the coaxiality of the tail bearing and the tail shaft automatically, enables the bearing to endure greater radial force, has simple structure, can avoid edge effect effectively, enables the pressure peak value to descend, and can lead overall distribution of the pressure to tend to be uniform.

The invention relates to a positioning device for machining multiple coaxial-hole parts. Four lifting lugs are screwed on four corners of a base; two guide rail supports are respectively mounted on both sides of the long axle of the base; each guide rail support is provided with a drill hole guide template to support a guide rail; a support seat is mounted on the base between two guide rail supports; a bolt is mounted on the support base; a pressing nut is mounted on the bolt; a clamp part pressure plate I and a clamp part pressure plate II are respectively mounted on the bolt; a transverse positioning block is mounted on the inner side of each guide rail support; an end point baffle plate and an end limit plate are mounted at both ends of each guide rail support; the end baffle plate and the end limit plate are provided with positioning bolts; a drill hole guide template is arranged on the outer side of each guide rail support; the base is provided with a reversible press device; the drill hole guide template is provided with a guide sleeve I and a drill hole guide template guide sleeve II; and a transverse clamp bolt I and a transverse clamp bolt II are mounted on each guide rail support. The invention has the advantages that the positioning precision is high and the coaxiality requirement of multiple processed coaxial-hole parts is ensured.

The invention relates to a taper detection device which comprises a mandrel device, wherein one end of the mandrel of the mandrel device is fixedly provided with an end disk, and the other end of the mandrel can be slidably sheathed in a movable disk the diameter of which is greater than that of the end disk; the movable disk is fixed with the mandrel through top threads; and the end surfaces of both the end disk and the movable disk are perpendicular to the mandrel. When the taper detection device is used for measuring the taper of a taper hole, the difference between the large and small diameters of the taper hole is fixed, thereby greatly reducing the measuring parameters and enhancing the measuring accuracy. The taper detection device provided by the invention is simple in structure and convenient in operation.

The invention discloses a machining method of a floating disc independently produced domestically. The method comprises following steps: heat treatment; A end face allowance and inner hole allowance of the floating disc are removed; B end face allowance and outer circle allowance of the floating disc are removed; the A end face and the outer circle are subject to finish turning, and a process lug is turned; the B end face and an inner hole are subject to finish turning; two end faces are turned over and ground; two end faces are ground; the end faces serve as benchmark ground holes; the outer circle is ground; according to the drawing, a chip groove center line at the positions of oil grooves in the two end faces is drawn out; the machining center is adopted to mill the oil groove in the A end face, and a first positioning pin hole is machined; the first positioning pin hole is used for positioning, the oil groove in the B end face and an inner hole oil groove are numerically milled, and a second positioning pin hole is machined; a chip removal groove is cut; two end faces are subject to accurate grinding; two end faces are ground; the first positioning pin hole, the second positioning pin hole and a process lug are used for positioning, in cooperation with a oil wedge grinding tool, and two end face oil wedge faces are ground; the outer circle is turned to the final size, and the process lug is removed; and burr removal is achieved by a bench worker.

The invention relates to a circular duct butt-welding rapid spotting and locating device and a circular duct butt-welding method. The circular duct butt-welding rapid spotting and locating device comprises a locating sleeve, a clamp device, and a tensioning device, the locating comprises a composite structure of two semi locating sleeve, bilaterally symmetrical tapered bores are arranged in the axial direction, a coaxial line circular hole is arranged between two tapered bores, thereby forming a left step rabbets and a right step rabbets, a plurality of radial step holes connected with the two tapered bores and the circular hole are arranged on the periphery of the locating sleeve; the joint part of the side of the two semi locating sleeves is hinged; the clamp device comprises two ear plates arranged on the two semi locating sleeve and a bolt and nut mechanism. The circular duct butt-welding method utilizes the structural characteristics of the tapered bore and the step rabbet of the device, and combines the groove shape of the circular duct which is required to be welded, by the help of the clamp device and the tensioning device, the rapid spotting, locating and tensioning of the circular duct butt-welding are realized, the problems that the accuracy of manual spotting, locating, and tensioning operation is poor, the labor intensity is strong, and the efficiency is low, etc. are solved, the requirements of axiality, the size of welding seam clearance, and no fault of the circular duct butt-welding are met.

The invention relates to a machining technology of a tubular mold inner hole of a stepped hole capable of guaranteeing coaxiality of the stepped inner hole of the tubular mold. The technology comprises the following steps that a blind hole with Phi 120 mm is drilled at first, due to the fact that the drill rod is fine, the drill rod extrudes long, the axis of the hole is deviated, and the disalignment is existed between the axis of the hole and the axis of the tubular body of the tubular mold; an upper lathe is used for adjusting a wall thickness difference to be smaller than or equal to 1.5 mm through the lathe frame positions; then the outer circle is lathed; the thickness difference of the full-length of a workpiece can be ensured to be less than or equal to 1.5 mm, and aligning is carried out on the workpiece according to the outer circle on a deep hole drilling and boring machine; and the holes of Phi 100 mm are drilled oppositely, the length of the holes of Phi 100 mm are shorter, the axis of the hole does not deflect, so that the inner hole coaxiality requirement of the stepped inner hole of the tubular mold is guaranteed, the wall thickness difference of the tubular mold isreduced, and the product machining quality is improved.

The invention discloses a rapidly-clamping clamp. A central shaft is of a five-section type step shaft structure, a first shaft section, a second shaft section, a third shaft section, a fourth shaft section and a fifth shaft section are sequentially arranged from left to right, a copper-base steel ball holder is arranged on the third shaft section in a sleeved mode, a pressing plate and a cover plate are both arranged on the fourth shaft section of the central shaft in a sleeved mode, protrusions are arranged on the right portion of the outer circle face of the pressing plate, the cover plate is located on the left side of the pressing plate, grooves are formed in the hole wall of a center hole of the cover plate, a compressed spring is installed inside the center hole of the cover plate and arranged on the fourth shaft section of the central shaft at the same time, the left end of the compression spring abuts against the step face of the central shaft, the right end of the compression spring is attached to the left plate face of the pressing plate, and a nut is installed on the fifth shaft section of the central shaft in a sleeved mode. According to the rapidly-clamping clamp, a gap between the hole wall of the center hole of a workpiece and the central shaft can be effectively achieved through the copper-base steel ball holder, the coaxiality requirement of the workpiece can be well met accordingly, then the machining accuracy and the machining quality of the workpiece can be guaranteed, and the rapid replacement can be achieved by loosening and fastening the nut and disassembling and assembling the cover plate.

The invention discloses a housing of multichannel speed sensor mounted at locomotive axle end. The casing includes an integral sensing head external casing, a printed board component, and a printed board component fixing piece. The integral sensing head external casing includes a cylinder main body which has an enclosed head portion and a middle portion and a tail end, and the middle portion is a cavity for receiving the printed board component and the tail end is provided with a positioning circular ring. The positioning circular ring is provided with a raised portion or a recessed groove, and correspondingly the printed board component fixing piece is provided with a recessed groove or a raised portion. The printed board component sleeves on the circular ring at the rear end of the cylinder main body. The recessed groove or the raised portion on the printed board component fixing piece accepts or is inserted to the raised portion or the recessed groove on the positioning circular ring so as to position the printed board component fixing piece. The printed board component fixing piece is also provided with a groovefor fixing the printed board component. The two sides of the printed board component are inserted to the groove and thus are secured. The circumference of the cylinder main body is provided with positioning components thereon. The positioning components each are provided with a concentric arc chute which is for connection with the cylinder main body. The casing herein has the advantages of simple structure, high production efficiency, and excellent precision.

The invention, which relates to the field of porcelain insulator production, discloses an integrated molding device of a porcelain insulator. The integrated molding device comprises a rotation liftingsystem, a mould pressing system, a glue extruding system, a glue packaging system, and a discharging system, wherein the mould pressing system, the glue extruding system, the glue packaging system, and the discharging system are arranged around the rotation lifting system at an interval with a 90-degree included angle. A tool plate that can be lifted in a rotating manner is arranged in the rotation lifting system and can rotate to the mould pressing system, the glue extruding system, the glue packaging system, and the discharging system respectively. The tool plate and a lower mould form a profile of an external surface of a porcelain insulator. After completion of mould pressing, the tool plate drives the tool plate to be separated from the lower mould to carry out a next procedure continuously. According to the glue packaging system, a oscillation machine below drives an oscillation shaft and heads of an iron cap and the porcelain insulator are connected for glue packaging; and a glass pin above is pressed down and glue packaging of the glass pin and a glue material added into the porcelain insulator at the last procedure is carried out. Therefore, integrated production of the porcelain insulator is realized; and the coaxiality requirement of glue packaging is ensured by precise rotation of the stepping motor.

The invention discloses an automobile micromotor shell and a manufacturing method thereof. The automobile micromotor shell comprises a cylindrical shell body, one end of the shell body serves as the opening end, a cylinder bottom is formed at the other end of the shell body, a bearing chamber which axially protrudes outwards and contains a bearing is arranged at the cylinder bottom, the axial outer end of the bearing chamber is provided with a fixing part used for fixing the axial end of the bearing, and a through hole used for allowing a motor shaft to stretch out is formed in the fixing part; a dented groove which is axially dented inwards is formed in a transition region between the axial outer wall surface of the cylinder bottom and the radial outer wall surface of the bearing chamber, and a convex rib which corresponds to the dented groove, protrudes towards the interior of the shell body and is used for increasing the axial effective length of the bearing chamber is formed in a transition region between the axial inner wall surface of the cylinder bottom and the radial inner wall surface of the bearing chamber. According to the automobile micromotor shell and the manufacturing method thereof, not only is the axial fitting length of an assembled bearing guaranteed, but also the perpendicularity requirement of the fixing part and the rotation center of the bearing chamber is guaranteed, and the phenomenon that normal running of a motor is affected due to the fact that noise is generated by looseness between the bearing and the fixing part is avoided.

The invention relates to a nuclear reactor coolant pump shaft sleeve installation technology. A mounting disc capable of being leveled, a long screw rod and a connecting nut are adopted to perform overall levelling and lifting on a shaft sleeve, guide tools are adopted in the bearing falling process for guiding, the position precision in the shaft sleeve falling process is ensured, and the shaft sleeve and a lower pump shaft are prevented from being scratched; and after the shaft sleeve falls by a certain depth, the screw rod and the nut do work on a pressing disc, it is ensured that the shaftsleeve is smoothly assembled to the shaft shoulder position of the lower pump shaft after falling, and the shaft sleeve is smoothly installed and positioned. According to the process, the problems that in the installation process of the nuclear reactor coolant pump shaft sleeve, shaking occurs, two workpieces cannot be ensured to be concentric, the sight is shielded, accurate positioning operation cannot be realized, and scratches and grooves are generated in the assembly process are solved, and the technology can also be applied to the field of installation technologies of other long-cylinder thin-walled parts.

The invention relates to a method for synchronously machining flange plates at the two ends of a rear axle housing welding assembly. The method comprises the steps that firstly, rough locating is conducted through a middle large hole of a rear axle housing, and V-shaped main locating and clamping are conducted through outer circles of the flanges at the two ends; secondly, main shafts at the two ends drive end face facing head end face roughing tools at the same time to rough turn large end faces and spigot end faces, and an axial machining allowance is reserved; thirdly, the main shafts at the two ends drive end face facing head end face finishing tools at the same time to fine turn the large end faces and the spigot end faces, and the requirements for the size of the large end faces, the size between the spigot end faces and the large end faces, the roughness of the large end faces, the circular run-out of the large end faces and the perpendicularity between the end faces and the axis of the outer circles of inner holes are met; fourthly, the main shafts at the two ends drive inner hole outer circle combined roughing tools to turn the spigot outer circles and the inner holes of flange heads at the two ends, and machining allowance is reserved; and finally, the main shafts at the two ends drive inner hole outer circle combined finishing tools to fine turn the spigot outer circles and the inner holes, and the requirements for coaxiality between the flanges at the two ends and the coaxiality between the inner circle and the outer circle of each flange are met. By the adoption of the method, multiple procedures are completed through one-time clamping.

The invention relates to a double-sided grinding / polishing machine with an automatic speed-changing function, for an optical glass screen. With the emerging of glass screens with radians, the thin parts of arc edges are easily broken due to large relative movement between grinding discs and level parts are insufficiently grinded in the case of a low speed, of the traditional polishing. Therefore,the invention discloses a grinding / polishing machine with an automatic speed-changing function, with regard to an optical sheet glass screen. The double-sided grinding / polishing machine disclosed by the invention comprises a box body (3), wherein an automatic speed-changing transmission system (11) is arranged in the box body (3); the automatic speed-changing transmission system is connected withan outer transmission inner sleeve (1); and the outer transmission inner sleeve is connected with an upper grinding disc drive sleeve (9) and a lower grinding disc drive sleeve (10) separately to complete power transmission, so that an upper grinding system and a lower grinding system can oppositely run at a certain speed ratio. A lifting support system (6) is installed on the box body and used for realizing a lifting function. The double-sided grinding / polishing machine disclosed by the invention is used for double-sided grinding / polishing for the optical glass screen through the five parts of the lifting support system (6), the upper grinding system (4), the lower grinding system (2) and the automatic speed-changing transmission system (11).

The invention discloses a machining process for a rotating vane type hydraulic steering engine. The machining process comprises the following machining procedures: machining a rotor, a cylinder and a fixed blade, assembling the cylinder and the fixed blade, machining the rotor body of the rotating vane type hydraulic steering engine and machining a sealing groove of the fixed blade, wherein in the rotor body machining procedure, a moveable blade and a substrate are separately machined; in the cylinder machining procedure, the casted and molded blank is subjected to coarse turning, precise turning, pneumatic grinding, polishing with sand bags, round angle trimming and oil hole machining on a numerical control vertical lathe; in the machining procedure of the fixed blade of the rotating vane type hydraulic steering engine and the assembling procedure of the fixed blade and the cylinder, the casted and molded blank is subjected to coarse turning, ageing, semi-precise turning, linear cutting, cover plate mounting hole boring, clamping, boring first mounting threaded holes of the cylinder, fixing cylinder and the fixed blade, machining pin holes and threaded holes for assembling the cylinder and the fixed blade, clamping, hydraulic valve mounting hole drilling, sealing groove boring and milling, fixing the cylinder and the fixed blade, precise turning of inner holes of the assembled fixed blade, threaded holes and sealing groove machining, and facing-up with the cylinder cover, so as to finish machining.

The invention relates to a notching device with a separated stator and a rotor, which comprises a die shank on the upper part, a fixing plate on the lower part of the die shank, an unloading plate, a rubber pad between the fixing plate and the unloading plate, a lower die on the lower part and a lower die plate base, wherein the whole device is arranged on a notching press to notch a stator slot and simultaneously separate a rotor punching and an excircle stator punching, and a ratchet wheel on the notching press rotates a round to finish a stator notching and a rotor separation. Three male dies are arranged in a male die fixing plate, the unloading plate and the male dies are in clearance fit by adopting interference fit, two jacking blocks are arranged in two separated holes of a female die, and a spring is used for finishing motions. The notching of a stator slot and the separation of the rotor punching are finished on a die without a separating die and a press machine for separating the rotor sheet, so the labor intensity is reduced and the working efficiency is improved; simultaneously, a blanking die of the stator excircle is not needed so that the manufacturing cost of the stator punching is greatly reduced; moreover, the excircle and the inside diameter of the stator are finished on the same die so that the requirement on the coaxiality is sufficiently ensured.

The invention relates to automatic equipment of mechanical assembly, in particular to automatic equipment capable of realizing accurate-torque fastening connection, and discloses four-axis synchronous accurate-torque fastening equipment for bolts. The four-axis synchronous accurate-torque fastening equipment for the bolts mainly comprises a machine frame, two linear guide rails, two tightening mechanisms, movable clamps, supporting tables and limiting blocks, wherein the linear guide rails are arranged on the machine frame in parallel, the supporting tables and the limiting blocks are fixedly connected to the linear guide rails, the movable clamps are movably connected to the linear guide rails, and the tightening mechanisms are symmetrically arranged on the two sides of the movable clamps. The four-axis synchronous accurate-torque fastening equipment for the bolts is suitable for mechanical assembly and can realize synchronous fastening connection of a plurality of parts, the driving force in the tightening process is stable and reliable, the efficiency is improved, and the fastening quality is improved.

The invention provides a precision optical machine assembly method of a trapezoidal prism optical system, and solves problems that existing mechanical assembly precision is low, and the high-precisionassembly requirement of a trapezoidal prism optical path cannot be met. The method comprises the following steps: 1) installing a first tool cross wire in a first lens cone, and taking an optical axis of a small circle in the center of the first tool cross wire as a main reference for assembly; 2) adjusting the mounting posture of a second lens cone on a bracket by using an auto-collimation theodolite; 3) moving the auto-collimation theodolite to an emergent light path of a trapezoidal prism, and adjusting the posture of the auto-collimation theodolite; 4) assembling a first front-end lens group into the first lens cone, and assembling a second front-end lens group into the second lens cone; 5) adjusting the translation amount of the trapezoidal prism on the bottom plate and a gasket between the third lens cone and the trapezoidal prism till that an auto-collimation image and the central cross wire image of the third tool cross wire on the third lens cone are aligned with the center of the eyepiece of the auto-collimation theodolite; and 6) assembling a rear-end optical lens group into the third lens cone.

The invention discloses a tool for turn milling. The tool comprises a chuck connecting piece and a step locating shaft; the chuck connecting piece is sequentially provided with a connecting piece chassis and a connecting piece boss which are in flange plate structures in the same axis; the outer diameters of the connecting piece chassis and the connecting piece boss are reduced sequentially; a clamping hole for the clamping and location of a claw is formed in the axis of the chuck connecting piece in a penetrating manner; the step locating shaft is sequentially provided with a locating shaft chassis, a locating shaft boss and a central spindle which are in cylindrical structures in the same axis; the outer diameters of the locating shaft chassis, the locating shaft boss and the central spindle are reduced sequentially; the outer diameter of the central spindle is identical with the inner diameter of a to-be-machined piece; the outer diameter of the locating shaft boss is greater than the inner diameter of the to-be-machined piece and is less than the bottom diameter of a sealing groove in the outer wall of the to-be-machined piece; the step locating shaft is fixedly arranged on thechuck connecting piece; and the to-be-machined piece sleeves the part, at the front end of the step locating shaft, of the central spindle. An outer cylindrical surface and the sealing groove can bemachined in once clamping, the requirement on the axiality of the outer cylindrical surface and the sealing groove can be ensured, and the requirement on the machining precision of a finish turning inner hole can be lowered.

The invention provides a CNC (computer numerical control) grinding machine and belongs to the technical field of machinery. The CNC grinding machine comprises a frame, a grinding tool and a bench movably mounted on the frame. The frame includes a conveying area and a processing area sequentially from front to rear. An incoming mechanism and a conveying mechanism are disposed in the conveying area. A spindle box and a discharging mechanism are disposed in the processing area. The discharging mechanism and the incoming mechanism are disposed on two sides of the spindle box. The conveying mechanism is disposed over the incoming mechanism and can linearly reciprocate between the incoming mechanism and the spindle box. A floating chuck is mounted on the spindle box. The frame is provided with an ejector base arranged right in front of the spindle box. The grinding tool is movably mounted right in rear of the spindle box. The spindle box is fixedly connected with the bench. The ejector base is disposed over the bench. The frame is further provided with a first drive motor and a second drive motor; the first drive motor can control the grinding tool to linearly move in the horizontal direction; the second drive motor can control the bench to linearly slide. The CNC grinding machine has the advantages of high automation level and operational convenience.

The invention relates to a one-off forming device for making a gear workpiece with internal and external teeth. The one-off forming device comprises an upper die and a lower die. The upper die comprises an upper die seat and an internal tooth forming upper convex die installed in the upper die seat; and a guide column which is concentric with the internal tooth forming upper convex die is arranged at the lower part of the internal tooth forming upper convex die. The lower die comprises a lower die seat and a lower female die fixed in the lower die seat; a male die guide sleeve which is concentric with the guide column is fixed in the lower female die; a cylindrical hole matching with the guide column is arranged at the upper part of the inner cavity of the male die guide sleeve; an external tooth forming die which is concentric with the male die guide sleeve is fixed at the lower part of the inner cavity of the male die guide sleeve; and an ejector is arranged below the lower female die. Through the guiding between the guide column and the male die guide sleeve, the one-off forming device ensures the coaxiality of the internal teeth and the external teeth of the workpiece, and therefore the machining quality of the workpiece is ensured.

The invention relates to the technical field of die casting of motor rotors, and discloses a pressure aluminum casting die for a squirrel cage rotor of a motor. The pressure aluminum casting die comprises an upper die part, a lower die part and a rotor core part, and is characterized in that the upper die part is provided with an upper die, guide pillars and upper die base plates; a positioning ring, a positioning hole and an exhaust system are arranged on the upper die; the upper die and a machine tool slider are connected through the guide pillars, and are fixedly arranged through irregularly-shaped nuts; the upper die base plates and the machine tool slider are fastened through inner hexagon screws; the lower die part is provided with a middle die and a lower die; a positioning ring, a positioning hole and an exhaust system are arranged on the lower die; the middle die is fixedly arranged on the lower die through the positioning ring on the lower die; the rotor core part is provided with a dummy shaft, a taper key and a rotor core; the taper key is embedded into a dummy shaft groove; the dummy shaft is arranged in the positioning hole of the lower die; and the rotor core is sleeved in the dummy shaft through a taper key guide sleeve. The pressure aluminum casting die is rational in design, simple in structure and accurate in positioning, and can run stably, the shortcomings of air holes and looseness of a pressure aluminum cast rotor are remarkably improved, the manufacturing quality of the rotor is improved, the production cost is lowered, and the working efficiency is improved.

The invention discloses a novel conjoined wheel train, which is characterized in that the conjoined rollers are fitted together with the outer circles of the two bearings through the bearing holes, the two bearings are spaced by a spacer, and the outer circle of the oil seal It has an interference fit with the oil seal hole of the conjoined roller, the outer circle of the mandrel is in an interference fit with the inner hole of the bearing, and is positioned with the end face of the bearing. After the outer circle is matched with the inner hole of the conjoined roller, it is locked and fixed with bolts. Through the above arrangement, the present invention synthesizes the gear train components into a conjoined gear train component, which ensures the coaxiality requirements of the outer circles at both ends and the bearing holes, and improves the assembly accuracy and the usability of the gear train.

The invention discloses a special-purpose disk spring type clamping and loosening device of a lathe. The device comprises an electric spindle arranged in a spindle box. One side of the electric spindle is provided with a chuck. The hollow part of the electric spindle is sleeved with a clamping and loosening mechanism. The clamping and loosening mechanism comprises a bracing steel ball used for bracing the chuck. The bracing steel ball is connected with a pop rivet through a connection screw. The pop rivet is sleeved with a disk spring. One side of the pop rivet is connected with one side of a push rod. The other side of the push rod is provided with a single-action extrusion cylinder. By adopting the disk spring type clamping and loosening device, air pressure does not need to be provided for the cylinder in the machining process; after a workpiece is machined, the cylinder resupplies air pressure, a piston compresses the spring to move leftwards, the pop rivet is pushed through the push rod, the disk spring deforms after being compressed, the bracing steel ball moves leftwards, and the chuck retracts and immediately loosens the workpiece. According to the special disk spring type clamping and loosening device, in the whole cycle process, the air pressure needs to be supplied only when the workpiece is loosened, the cylinder only needs to work instantaneously, and accordingly the energy saving effect of the cylinder is achieved.

The invention provides an indicating device and an indicating method for PET-CT(positrom emission tomograghy-computed tomography) rack mounting alignment. The indicating method includes the steps of respectively mounting a CT central indicating component and a PET central indicating component on a CT rack rotating part and a PET rack; by a laser of the CT central indicating component, emitting a laser beam to the PET rack for indicating a CT rotation center, regulating positions of front and back supporting points of the PET rack, aligning the laser beam to a first central indicator and a second central indicator on the PET central indicating component, thereby achieving alignment between the CT rotation center and the center position of a PET probe. The indicating device is simple in structure and convenient to regulate; by the indicating device and the indicating method, influence from processing and mounting error of the CT central component can be eliminated, alignment precision is high, and the requirement on the mounting coaxiality of the PET probe center and the CT rotation center is guaranteed.

The invention discloses an efficient heat dissipation type middle gear motor with a centrifugal overrunning double-clutch system, and the motor comprises a housing, a motor shaft, a heat dissipation fan, a rotor assembly, a stator assembly, a planetary speed reduction mechanism assembly, the centrifugal overrunning double-clutch system, and a speed changing chain wheel. The heat dissipation fan isfixed at one side, close to an insulating oil cooling groove, of the motor shaft, the stator assembly and the rotor assembly are arranged in the insulating oil cooling groove, and the centrifugal overrunning double-clutch system comprises a centrifugal clutch, an overrunning clutch inner ring and an overrunning clutch outer ring. The planetary speed reducing mechanism assembly is connected with the overrunning clutch outer ring, and the speed changing chain wheel sleeves the overrunning clutch inner ring. The overrunning clutch transmission is formed when the overrunning clutch outer ring andthe overrunning clutch inner ring are connected in a clamped manner, and centrifugal clutch transmission is formed when the centrifugal clutch and the overrunning clutch inner ring are connected in aclamped manner. According to the present invention, the efficient heat dissipation and zero-magnetic-resistance sliding can be achieved, higher power is obtained, the riding mileage of a whole bicycle is increased, the service life is prolonged, and the riding experience is improved.

The invention relates to a valve core component and a thermal expansion valve using same, belonging to the technical field of refrigeration control. The valve core component comprises a valve sleeve (7), a valve core seat (1), a valve core (2), an elastic body and a support seat (6), wherein the valve core seat (1) is fixed on the valve sleeve (7) and is provided with a valve port (12); the valve core (2) is placed into the inner cavity of the valve core seat (1); and the support seat (6) is used for supporting the valve core (2) through the elastic body. The valve core component is characterized by further comprising a valve core guide piece (3) which is fixed in the inner cavity of the valve core seat (1) and is provided with a plurality of flow channels, and a valve core support seat (4). In the invention, the axis deviation of the valve core is controlled by setting the valve core guide piece, and the valve port (12) of the valve core seat (1) and the valve core support seat (4) are butted with the valve core (2) through cambered surfaces, so that transverse stress of the valve core (2) can be eliminated, the requirement of coaxiality between the valve core (2) and the valve port (12) is met, and the adjusting accuracy and closing air tightness of a valve are enhanced.

The invention discloses an ultrasonic drilling device. The device is mainly composed of a sleeve cup, an induction coil set, a cooling system, a transducer, an amplitude transformer and a drill pipe,the top of the sleeve cup is connected with a machine tool main shaft through a clamping mechanism, and the lower portion of the sleeve cup is open. The induction coil set matched with the transduceris wound on the outer wall of the sleeve cup; the cooling system and the transducer are arranged in the open end of the sleeve cup; the driving end of the transducer is connected with the input end ofthe amplitude transformer, the amplitude transformer is fixed to the end face of the open end of the sleeve cup through a connecting bolt, and the output end of the amplitude transformer is connectedwith the upper end of the drill pipe; and a cutter is arranged at the lower end of the drill pipe. The ultrasonic drilling device has the beneficial effects that the ultrasonic drilling device is connected with the machine tool main shaft through the clamping mechanism, rotation of the machine tool main shaft and longitudinal vibration of the transducer form longitudinal-torsion composite vibration, and then a workpiece can be drilled; the cooling system is integrated in the ultrasonic drilling device, the transducer and the workpiece can be simultaneously cooled, and an external cooling system is not needed; and the ultrasonic drilling device is high in machining speed, high in machining precision, good in machining quality and small in abrasion of the drill pipe.