52results about How to "Eliminate radial play" patented technology

The invention discloses a centripetal thrust protection bearing device for automatically eliminating a protection clearance in a magnetic suspension bearing system. The centripetal thrust protection bearing device comprises a rotary shaft, a rotor assembly, a sliding block, an installation seat and a bearing seat, wherein two angular contact ball bearings are arranged between inner cavities of the installation seat and the bearing seat; the sliding block comprises more than two sliding block sub-bodies; each sliding block sub-body is arranged in a sliding block guide groove through a sliding rod; all the sliding rods are connected into a whole through an annular connecting piece; waist-shaped holes are formed in positions, corresponding to the sliding rods, on the annular connecting piece; at least one sliding block sub-body is provided with a sliding block retaining device; a proper axial clearance is formed between the rotary shaft and the installation seat. Therefore, the device can protect a rotor in the radial and axial directions when the magnetic suspension bearing system fails and the rotor drops, and a radial clearance between the rotary assembly and a rolling bearing can be eliminated, so that vibration and impact on the rolling bearing after the high-speed rotor drops are eliminated, and the reliability and the safety of a centripetal thrust protection bearing are improved.

The invention discloses a quick-blind-mating floating-type-mounted RF coaxial connector and a connecting method thereof. The RF coaxial connector comprises a socket and a plug. The socket comprises an inner conductor jack, an insulator, a socket outer conductor, a floating sleeve, a spring and a mounting panel. The plug comprises a plug outer conductor, an inner conductor inserting pin, an elastic collar and a mounting board. The elastic collar is connected with an engaging trough in an adapted engaging manner. The inner hole linear section of the socket is in insertion fit with the outer cycle linear segment of the plug. According to the RF coaxial connector, on the condition that the plug is inserted into the socket, two reference surfaces are superposed, thereby forming a theoretical zero clearance and ensuring continuity of capacitance. Furthermore a specific engagement structure is utilized, thereby eliminating radial clearance and preventing axial endplay clearance in a stationary state in insertion. Furthermore the quick-blind-mating floating-type-mounted RF coaxial connector and the connecting method have advantages of small size, compact structure, low reflection coefficient, low voltage standing wave, full-band linear voltage standing-wave ratio, excellent shielding efficiency, etc.

The invention relates to a magnetic levitation bearing system, in particular to a manual type bearing protection device. The manual type bearing protection device comprises a rotor, two bearing seats,two groups of bearing protection assemblies and a manual driving assembly; two ends of the rotor are in a circular truncated cone shape; the two bearing seats are arranged at the two ends of the rotor, and the two ends of the rotor extend into the bearing seats; the two groups of the bearing protection assemblies are symmetrically and slidably arranged in the bearing seats, cone-shaped holes which are matched with the ends of the rotor are formed in the bearing protection assemblies; and the manual driving assembly drives the bearing protection assemblies to axially move close to each other until the bearing protection assemblies are in contact with the rotor. The manual type bearing protection device can temporarily support the rotor when a magnetic bearing system fails, can manually protect the rotor, prevents damage caused by falling of the high-speed rotor, and improves the security of the system.

The invention provides an automatic anti-backlash worm wheel dividing mechanism. A worm wheel and a worm mutually meshed are arranged in a case. A servo motor is connected with the worm through a coupling. The mechanism is characterized in that an anti-backlash mechanism is arranged in the case; the movable part of the anti-backlash mechanism has a pressurizing contact capable of extending out to contact a pressure bearing surface of the worm and exerting pressure on the worm; and the direction of pressure is perpendicular to or inclined to the axis of the worm, points at the worm and passes through the central plane of the worm wheel. The dividing mechanism can effectively eliminate the non-uniqueness of the output angle of existing worm wheel dividing mechanisms, greatly increase the non-uniqueness and is beneficial to decreasing the manufacturing difficulty of a precision worm wheel dividing mechanism.

The invention discloses a crystallizer-oscillated eccentric mechanism without a radial clearance, and relates to continuous casting equipment. The eccentric mechanism is characterized in that a matching part of an eccentric shaft and an eccentric sleeve is formed by connecting large cylindrical surfaces, circular table surfaces and small cylindrical surfaces; two disc bodies with the equal external diameter are arranged on the eccentric shaft and the eccentric sleeve respectively and are connected with the large cylindrical surfaces of the eccentric shaft and the eccentric sleeve respectively; a key groove is formed in the circumference of each disc body respectively; keys are mounted in the aligned key grooves; and the two disc bodies are fastened together through a clamping ring. According to the invention, the circular table surfaces are matched without a clearance, so that the radial displacement of the eccentric shaft and the eccentric sleeve is avoided; and therefore the defects of radial oscillation and radial abrasion generated between the eccentric shaft and the eccentric sleeve due to the fact that a mounting clearance is preformed on the existing eccentric mechanism is overcome. In addition, the clearance matching is adopted by the cylindrical surfaces of the eccentric shaft and the eccentric sleeve, so that the eccentric mechanism is mounted and disassembled simply and easily, and the eccentric distance of the eccentric mechanism is also regulated simply and easily. The eccentric mechanism provided by the invention has the advantages of simple structure, long service life, stability in running and high oscillation precision.

The invention discloses a combination bearing for an offset press, comprising a double-outer ring double-column center cone roller bearing, where there is a double-inner ring double-column center cone roller bearing arranged in a space inside inner ring of the former roller bearing, rotation centers of the two roller bearings are displaced, and the preloads applied onto the two roller bearings to eliminate radial windage of bearings are opposite and offset each other and therefore can not be transferred to wall panels so as to be able to realize high-rigidity, high-speed and high-accuracy rotation and improve printing quality, and it can realize clutch operation and pressurization between rollers by rotation of the inner ring of the double-outer ring double-column center cone roller bearing, simple in structure and reliable to operate and able to be continuously adjusted.

The invention provides an elastic cone wedge-caulking type anti-disengagement nut mainly formed by combining a thick nut body with a conical hole in the right end and a thin nut body with an outer cone boss at the left end. At least two blind grooves with one ends closed and the other ends closed are evenly distributed in each of the two ends of the thin nut body. During use, because of the wedge-caulking of a cone and the tightening effect of the blind grooves, the axial clearance and the radial clearance between the elastic cone wedge-caulking type anti-disengagement nut and a thread of a bolt can be effectively eliminated, and the anti-disengagement and retreating stopping effects of the elastic cone wedge-caulking type anti-disengagement nut are achieved. According to the elastic cone wedge-caulking type anti-disengagement nut, the plane wedge-caulking principle is ingeniously applied in the three-dimensional cone and is combined with the blind groove elastic shrinkage principle, the structure is simple, the anti-disengagement and retreating stopping effects are stable and reliable, installation and detachment are convenient, and the elastic cone wedge-caulking type anti-disengagement nut can be widely applied to various occasions, having strict anti-disengagement requirements for thread tightening pieces, especially occasions where air planes, automobiles and high-speed trains have special requirements for disengagement prevention of the tightening pieces.

The invention discloses a plastic hook piece rolling mold which comprises a hollow shaft, a plurality of working circular thin pieces, adjusting circular thin pieces and compression nuts, wherein the hollow shaft is composed of an upper shaft head, a lower shaft head, an outer conical cylinder between the upper shaft head and the lower shaft head and an inner conical expansion sleeve sheathed on the outer conical cylinder; the plurality of working circular thin pieces and the adjusting circular thin pieces are sequentially sheathed on the hollow shaft; the compression nuts are arranged at thetwo ends of the hollow shaft and compress the working circular thin pieces and the adjusting circular thin pieces; the compression nuts correspond to the diameters of the outer conical cylinder and the inner conical expansion sleeve; an annular shoulder is arranged at one end of the inner conical expansion sleeve; an axial opening is arranged on the peripheral wall of the inner conical expansion sleeve; and a cooling liner is arranged in the hollow shaft. The inner conical expansion sleeve with the axial opening expands under the extrusion of the compression nuts, thereby eliminating the radial clearances between the inner holes of the working circular thin pieces and the adjusting circular thin pieces and the central shaft, improving the coaxiality and roundness of the rolling mold and enabling the thickness of a plastic hook piece to be more uniform. In addition, through cooling of the cooling liner, the mold stripping effect of the rolling mold is improved.

The invention discloses a precision centering anti-tilting device with a static pressure rotary workbench. The precision centering anti-tilting device with the static pressure rotary workbench structurally comprises a static pressure rotary workbench mounting base, the static pressure rotary workbench, double-row cylindrical roller bearings, a thrust ball bearing, an annular base plate, a bearinggland, a shrink ring, a connection board, a gland, an angle encoder and a center shaft, wherein the center shaft is fixedly arranged on the static pressure rotary workbench mounting base; the center shaft is sleeved with the double-row cylindrical roller bearings; an inner hole of the double-row cylindrical roller bearings and the center shaft matched with the inner hole both have tapers; the shrink ring is installed on the center shaft; the circumference of the shrink ring is sleeved with the annular base plate; the thrust ball bearing is arranged on the annular base plate; the bearing glandis installed on the shrink ring and the thrust ball bearing; the angle encoder is installed on the bearing gland; the gland is installed on the upper end face of the workbench; and the connection board is connected with an output shaft of the angle encoder and the gland. The precision centering anti-tilting device with the static pressure rotary workbench is compact in structure, simple and reasonable in design, remarkable in anti-tilting effect, and capable of reducing the positioning errors and improving the positioning precision and rotation accuracy.

The invention relates to a screw rod and a threaded hole perpendicularity test tool with the same. The screw rod comprises a central screw rod body, a taper sleeve, at least two external threaded blocks evenly distributed on the periphery of the taper sleeve in the circumference direction, and an elastic maintaining structure used for hooping the external threaded blocks on the peripheral face of the taper sleeve. A threaded part used for being connected with the central screw rod body in a threaded mode is arranged in the taper sleeve, the peripheral face of the taper sleeve is an external taper face with the small end and the large end distributed in the axial direction of the central screw rod body, the external threaded blocks are provided with external threads coaxial with the central screw rod body, the external threaded blocks and the taper sleeve are matched in the axial direction of the central screw rod body in a rotation-stopping movement mode, and the external threaded blocks are further provided with inner taper faces which are matched with the external taper face of the taper sleeve and are subjected to radial opening acting force under the axial moving effect of the taper sleeve. The central screw rod body is rotated to enable the external threaded blocks to be expanded and retracted, so that the diameter of the circumferential face where the external threaded blocks are located is changed, and when the screw rod is used for carrying out threaded hole perpendicularity testing, the radial gap generated when the screw rod is connected with a tested threaded hole can be eliminated, and precision of a testing result is improved.

The invention relates to the field of magnetic suspension bearing systems, in particular to an integrated electromagnetic protective bearing device. The integrated electromagnetic protective bearing device includes conical outer surfaces, two sets of supporting assemblies, two axial thrust discs and two sets of electromagnetic adsorption assemblies. The two conical outer surfaces are symmetricallyarranged at the two ends of a rotor; the two sets of supporting assemblies correspond to the two conical outer surfaces respectively, the inner peripheral surfaces of the supporting assemblies are inner conical surfaces matched with the conical outer surfaces, and the supporting assemblies can axially approach and rotationally support the conical outer surfaces; the two axial thrust discs are symmetrically arranged at the two ends of the rotor; and each electromagnetic adsorption assembly provides adsorption force for the corresponding supporting assembly and the corresponding axial thrust disc located at the same end, the rotor can normally rotate in a normal working state, the two axial thrust discs can ensure the axial balance of the rotor under the effect of the adsorption force, andin an emergency, the supporting assemblies axially approach and support the conical outer surfaces under the action of a reset element. The technical problems that a protective bearing device in the prior art has slow respond speed and a complex structure are solved.

According to the invention, the antifriction bearing (18) needs not to open the outside lane (23). However, the outside lane (23) has a filling groove (34) for keeping unblock when being used. However, the diameter of the filling groove (34) is smaller than the diameter (D) of the ball, thereby the ball (25) does not fall off. In addition, the outside lane (23) of the bearing (18) displays a definite radial elastic. And the antifriction bearing (18) is radially and constrainedly installed through a pressing cooperation, thereby the ball (25) no longer jump out of the bearing (18). In order to assembly antifriction bearing (18) in an accurate angle, the filling groove (34) is out of the range of maximum stress. For this purpose, the filling groove (34) is preferably structured to cause the sealed ring (33) to keep existed and visible.

The invention discloses a numerical-control automatic boring machine tool for a shaft coupler hole. The numerical-control automatic boring machine tool comprises a rack which is fixedly arranged on asteam turbine cylinder body, wherein a rotary assembly, a feeding assembly, a regulating control part, an electric control box, a laser centering apparatus and a control touch screen are arranged on the rack; the rotary assembly, the feeding assembly, the regulating control part, the laser centering apparatus and the touch control screen are connected with the electric control box; the rotary assembly is used for realizing positive rotation or negative rotation of a boring head for boring a shaft coupler bolt hole; the feeding assembly realizes enabling the rotary assembly including the boringhead to advance and retreat towards a shaft coupler; the laser centering apparatus is used for measuring a coaxiality value of the shaft coupler bolt hole and the boring head, feeding back the valueto the electric control box, controlling a corresponding button of the control touch screen according to the fed-back value, and realizing horizontal front-rear movement, vertical up-down movement andhorizontal swing-angle movement of the boring head by automatic linkage of the regulating control part. The numerical-control automatic boring machine tool is used for automatic boring for holes in ashaft coupler of a steam turbine, and can realize functions of automatically centering, automatically feeding and boring, and controlling the action of the touch control screen.

The invention discloses a gear angle quick aligning and positioning device for gear grinding and a positioning method. The gear angle quick aligning and positioning device for gear grinding comprisesa bottom plate mounted on a working table of a machine tool, a piston is fixedly arranged in the center of the bottom plate, an oil cylinder is arranged on the piston in a sleeving mode, and the outerwall of the piston is in close contact with the inner wall of the oil cylinder; an oil cylinder end cover is mounted at one end of the oil cylinder, an aligning and tool-setting mechanism matched with a workpiece gear is mounted at the other end of the oil cylinder, and the oil cylinder end cover is arranged on a piston rod of the piston in a sleeving mode and is in sealed connected with the piston rod; a first oil circuit and a second oil circuit are formed in the piston to communicate with a first working oil cavity and a second working oil cavity correspondingly; and when the first oil circuit works, the aligning and tool-setting mechanism is driven to move upwards to complete tool-setting positioning, and when the second oil circuit works, the aligning and tool-setting mechanism is driven to move downwards to complete tool retracting. Quick aligning and precise positioning of the workpiece angle can be realized, positioning stability is good, and the quality and efficiency of batch machining and the automation level of the machine tool are improved.