34results about How to "Control coaxiality" patented technology

The invention relates to a precise process procedure for internal and external moulding surfaces of an antenna dome. The precise process procedure comprises the following main steps: (1) datum grinding process; (2) test process; (3) antenna dome installation process; (4) coarse and fine grinding process of external moulding surface of the antenna dome; (5) external moulding surface test process; (6) antenna dome installation and conversion process; (7) coarse and fine grinding process of internal moulding surface of the antenna dome; (8) test process; and (9) electrical thickness test process. The invention further relates to active position-finding technological equipment supporting installation of the antenna dome outside a machine, which consists of an external moulding surface special fixture (20), an internal moulding surface special fixture (30), a position finder (71) and a position finder (72), a position-finding workstation (40) and the like. The active position-finding technological equipment significantly improves the installation accuracy and the installation reliability of the antenna dome, significantly improves the working accuracy and the yield of the antenna dome, which in particular improves the coaxial accuracy by two grades or above two grades. By adopting the active position-finding technological equipment supporting installation of the antenna dome outside the machine, the debugging difficulty is significantly reduced; the installation and debugging time is reduced; the and utilization ratio of a numerical control grinder specially used for the antenna dome is effectively improved.

A piston connected to a piston rod is fitted in a cylinder having a hydraulic oil sealed therein. Flows of hydraulic oil induced by sliding movement of the piston are controlled by extension and compression damping force generating mechanisms and to generate damping force. In the extension damping force generating mechanism, the valve-opening pressure of a disk valve is controlled by the pressure in a back pressure chamber. An elastic seal member fixed to the disk valve is brought into sliding contact with an inner peripheral surface of a cylindrical portion of a valve member to seal the back pressure chamber. The disk valve is self-aligned by fitting between the elastic seal member and the inner peripheral surface of the valve member and secured by being axially clamped at an inner peripheral portion thereof in a state where a clearance is formed between the inner peripheral portion of the disk valve and a shaft portion of the piston rod, thereby reducing the requirements for coaxiality.

The invention discloses a vacuum brazing method of a gas burner of a combustion chamber of a gas turbine, which relates to a welding method of a gas burner, in particular to a vacuum brazing method of a gas burner of a combustion chamber of a gas turbine, and solves the problems that the welding quality is poor, the welding deformation is big, and the production period and the quality of the gas turbine are affected when the prior art is adopted for welding the gas burner. The method comprises the following main steps: firstly, cleaning all surfaces, operating platforms and jig surfaces of parts of a nozzle to be welded, secondly, performing primary welding, thirdly, performing primary brazing filler metal coating, fourthly, performing primary brazing, fifthly, performing secondary welding, sixthly, performing secondary brazing filler metal coating, and seventhly, performing secondary brazing. The method is used for welding the gas burner of the combustion chamber of the gas turbine.

The invention discloses an electronic expansion valve, belongs to the technical field of refrigeration system control, and solves the technical problem of wear caused by the coaxiality difference between the existing electronic expansion valve nut and a valve needle assembly. The electronic expansion valve comprises a valve body, a nut, a valve needle assembly and a guide sleeve, wherein the nut and the guide sleeve are assembled on the valve body, and the valve needle is arranged on the nut; the nut and the guide sleeve are integrally molded by injection.

The invention discloses an installation structure of a radial magnetic bearing and a radial sensor and an installation method of the installation structure of the radial magnetic bearing and the radial sensor. The installation structure is characterized in that the radial magnetic bearing comprises an upper pressing plate, a lower pressing plate and silicon steel sheets, wherein coil frameworks are respectively installed on the inner side surfaces of the silicon steel sheets; coils are respectively intertwined on the coil frameworks; after the external circular arc surfaces of the silicon steel sheets are surrounded, the external cylindrical surface of the radial magnetic bearing is formed; after the inner side tail ends of the coil frameworks are surrounded, the internal cylindrical surface of the radial magnetic bearing is formed; the upper pressing plate comprises an upper step, a middle step and a lower step; a circular hole is formed in the middle of the upper pressing plate; a plurality of through holes are uniformly formed at intervals in the periphery of the round hole in the upper step; a plurality of groups of penetration holes are formed in the lower step; two outmost holes among the penetration holes are pin holes; the pin holes are also formed in the places, corresponding to the pin holes in the upper pressing plate, of the lower pressing plate; cylindrical pins are arranged in the pin holes in the lower pressing plate and the pin holes in the upper pressing plate in a penetrating mode; a magnetic bearing circuit board is arranged on the middle step; after the radial sensor is placed in the through holes, the tail end thereof is electrically connected onto the magnetic bearing circuit board.

The invention relates to a shaving head device of a rotary type electric shaver. The shaving head device comprises a shaving head blade and a blade net, and is characterized in that the shaving head blade comprises inner circle knives and outer circle knives, the inner circle knives and the outer circle knives are concentrically arranged on a main blade base, auxiliary blades are arranged at the bottom of the main blade base, and elastic auxiliary knives are arranged on the peripheries of the auxiliary blades; the auxiliary knives are arranged at the front ends of the working portions of the outer circle knives of a main blade when the outer circle knives rotate, included angles are formed between the auxiliary knives and the outer circle knives of the main blade, and the auxiliary knives rebound after being in contact with beards to be then in contact with the outer circle knives to be lifted upwards. According to the structure of the shaving head device, the strength of a base body can be effectively improved through the inner circle knives, it is guaranteed that the coincidence of running tracks of the knives in working is high, the service life of the knives is prolonged, the matching degree of the blade and the blade net is improved, the sharpness is high, and the sound coincidence is high. The beards can conveniently enter the blade net at multiple angles through the design of the M-shaped blade net, and the shaving efficiency is improved.

The invention discloses a model supporting device applied to a wind tunnel test. The device comprises a model back support, a false tail supporting rod and a middle support which form a triangular connecting structure, wherein the model back support and the middle support are integrally machined; a balance is installed in the model, the model back support is supported on the back of the model, thefalse tail support rod stretches into the tail of the model and is isolated from the model without making contact with the model, the false tail support rod is fixed to the false tail support rod support, and the model back support and the false tail support rod support are fixedly connected to the upper portion of the middle support; the lower end of the middle support extends downwards and is fixed to a bottom supporting platform, and the bottom supporting platform is fixed to a wind tunnel lower wall plate. The device is compact in structure, miniaturized, reasonable in layout and convenient to use, effectively reduces the interference of the size and shape of the support on the aerodynamic force of the model, and meets the requirements of a wind tunnel model support system.

A gasket has seal portions at portions contacting peripheries of upper end portions of internal surfaces of cylinders, respectively. By being provided with a stopper, each of the seal portions is formed as a thick portion in the gasket. The stopper of each of the seal portions has a portion whose thickness is greater than a thickness of the stopper of each of the seal portions corresponding to cylinders at both ends of the cylinder alignment.

The invention provides a machining tool and a machining method for controlling the coaxiality and parallelism of parts. The machining tool comprises a turning tool rod and a machining blade, wherein the turning tool rod is shaped like an L, and comprises a turning tool rod clamping part and a turning tool rod machining part, and the machining blade is connected with one end, which is opposite to the turning tool rod clamping part on the turning tool rod, of the turning tool rod. The machining method for controlling the coaxiality and parallelism of the parts includes the following steps that firstly, the machining tool is chosen, and the machining tool and the part to be machined are mounted on a machine tool; secondly, a conventional turning tool is utilized to machine the front end surface and a bore of the part to be machined; finally, the tool is replaced, the feed direction of the turning tool rod is adjusted, and the rear end surface or excircle of the part to be machined is machined. The invention can be utilized to better control the parallelism between the front end surface and rear end surface of the part to be machined and the coaxiality between the excircle and bore of the part to be machined, the efficiency of machining is increased, and the cost of machining is reduced.

The invention discloses a machining method for a gear ring type product. In order to achieve machining of the gear ring type product, an auxiliary clamp is adopted, and the auxiliary clamp structurally comprises a pull rod, a transition disc, a positioning shaft, a positioning disc and a spring sleeve, wherein the spring sleeve is fixed to the upper end of the pull rod, the transition disc, the positioning shaft and the positioning disc are coaxially arranged from bottom to top, and the pull rod penetrates through the centers of the positioning disc, the positioning shaft and the transition disc. The method for machining the gear ring type product by adopting the auxiliary clamp comprises the following steps that an existing clamp with elastic core shaft positioning and end surface pressing is used for roughly turning an outer circle firstly; then, a vertical numerical control lathe is used, the used auxiliary clamp is installed on a spindle of the lathe to carry out finish turning onan outer circle and an inner hole of the gear ring type product, and the roundness of the outer circle subjected to finish turning treatment is controlled within 0.05 mm; and finally, a clamp spring groove and a step are cut to complete product machining. The clamp is simple in structure, low in manufacturing cost and convenient to use, ensures the quality of the machined product, and improves theproduction efficiency.

The invention discloses an emission device for emitting electrons, a preparation method thereof and an electron gun. An emission device used for emitting electrons comprises a main body part, at least four conductive electrode positioning rings, a first electrode positioning ring, a second electrode positioning ring, a third electrode positioning ring, a fourth electrode positioning ring and a fourth electrode positioning ring, the electrode positioning ring comprises a center positioning ring located in the center, an outer side positioning ring located on the outermost side and a plurality of middle positioning rings located between the center positioning ring and the outer side positioning ring. The at least three ceramic rings are respectively arranged between two adjacent electrode positioning rings; the cathode heat shield assembly is mounted in the central positioning ring; the control electrode is arranged on the central positioning ring; the at least one anode is arranged on the middle positioning ring; and the end cover is combined on the outer side positioning ring, and the control electrode and the anode extend into a containing groove, facing the main body part, of the end cover.