1765results about How to "Improve coaxiality" patented technology

The invention provides a vehicle supporting bridge pipe and end face flange welding machine and a welding method thereof. The welding machine comprises a welding seat, a supporting flange plate is fixed at the upper end of the welding seat, a second three-claw chuck is fixed on the supporting flat plate, a circumferential rotating device coaxial with the second three-claw chuck is arranged on thesupporting flat plate, two welding guns are fixed on two sides of the center of the circumferential rotating device, a vertical beam is fixed on the supporting flat plate, a lifting mechanism is fixedon the vertical beam and fixed to a first three-claw chuck through elastic connection, a second three-claw chuck and the first three-claw chuck are fixed to a flange and a supporting bridge pipe respectively, and the welding guns weld the flange and the bridge pipe when rotating. The welding guns with two circumferential sides in symmetry are adopted to weld a welding position at the same time, welding deformation of the supporting pipe and the flange caused by welding stress is reduced, and coaxiality between the supporting pipe and the flange is improved.

The invention provides a press mounting device for a bearing of a rear axle differential of a small vehicle. The device comprises a bracket; a horizontally-arranged supporting plate is fixed to the upper surface of the bracket; the lower ends of a first vertical column and a second vertical column are respectively fixed to the left end and the right end of the upper surface of the supporting plate, wherein the first vertical column and the second vertical column are vertical and arranged in parallel, and the first vertical column and the second vertical column are glidingly connected with two ends of a differential fixing plate and a downward-pressing plate from bottom to top in a sequence; the upper ends of the first vertical column and the second vertical column are fixedly connected with a cylinder fixing plate; a cylinder of which a piston rod downwards extends out is fixed to the cylinder fixing plate; the downward-pressing plate and a fixing device for the bearing at the upper side of the differential are fixed below the piston rod of the cylinder; a second circular through hole for mounting the differential is formed in the differential fixing plate; a bearing fixing seat for mounting a pressing-in bearing at the lower side of the differential is fixed to the supporting plate. The device is simple in structure, and small in cost; the efficiency of press-mounting of the bearing of the differential can be improved.

A drive device is assembled with a fitting outer wall of a heat sink and a fitting inner wall of a frame combined by an interference fit. The drive device allows for a sufficient assembly accuracy of coaxiality, and may prevent a pulsation of motor torque and a vibration sound caused by a tilt of a shaft. Further, heat conductivity at a contacting portion is improved for heat dissipation from an electronic element in a controller section via the heat sink, the frame, and a bottom plate.

The invention discloses a thin-wall tube body fastening device which relates to a tool for processing a thin-wall tubular work piece on a lathe, and comprises a mandrel; a spacer is arranged in the center of the mandrel; a left baffle, a left conical sleeve, a left pressure block and a retaining ring are sequentially arranged on the mandrel on the left side of the spacer; a right baffle, a right conical sleeve and a right pressure block are sequentially arranged on the mandrel on the right side of the spacer; the spacer, the left baffle, the left conical sleeve, the left pressure block, the right baffle, the right conical sleeve and the right pressure block can slide on the mandrel; axial gaps are respectively arranged between the left baffle and the left conical sleeve and between the right baffle and the right conical sleeve; the retaining ring is fixedly arranged on the mandrel; a fastening nut is arranged on the mandrel on the right side of the right pressure block; and circular Half blocks which are provided with conical inner holes, and comprise a plurality of semi-rings are respectively arranged on the outer peripheral conical surfaces of the left conical sleeve and the right conical sleeve in a matching way. First, a thin-wall tube body is fastened on the thin-wall tube body fastening device, the thin-wall tube body can be fixed only after the mandrel is fixed on the lathe, the fixation to the thin-wall tube body is simple, the axiality of both ports of the tube body is high, the tube body does not deform when in processing, and the processing precision is high.

The invention discloses a package packing method of a liquefied natural gas tanker container. An inner tank is set up on the positions of assembly process pipes on the two ends through special supports, the lower section of each support is provided with four concave wheels which are engaged with outer cylinder guide rails, two support pipe which are engaged with the assembly process pipes on the two ends of the inner tank are arranged on the upper end of the support, the support is arranged on the outer cylinder guide rails whose heights are decided by the center shaft of the inner tank overlapping the center shaft of the outer cylinder. The inner tank and the support are pushed by a truss hoist and other devices on the far end from the inner tank to the outer cylinder, and the inner tank is slowly sleeved in the outer cylinder to the assembly position. The invention can precise the center positioning of the inner tank through adopting double supports, and the axialities of the inner tank and the outer cylinder are high, which are specially used to pack assembly under the condition that the distance between the outer surface of the inner tank and the inner surface of an outer cylinder is smaller. The double support enables the inward swallowing process of the inner tank much smoother, which avoids that the inner tank skews to hit the outer cylinder result in damaging an insulation layer in the packing process, and largely reduces the packing operation time, and the safety is much higher.

The invention belongs to the technical field of mechanical performance test, and relates to a test clamp suitable for high-temperature lasting creep deformation of a plate-like test sample. The clamp comprises two portions, namely, a clamp main body and a cushion block assembly, wherein the clamp main body is a cuboid shaped like the Chinese character Hui, a cavity is formed in the clamp main body, the cushion block assembly is divided into two elements, and longitudinal axes of the clamp main body, the cushion block assembly and the plate-like test sample stay on a same straight line; and the plate-like test sample is installed and clamped, a parallel section of the plate-like test sample is arranged between the two elements and fixed together by virtue of bolts, and then the test sample is integrally placed into the cavity of the clamp main body. The test sample and the clamp are connected in a clamping end suspension manner, so that the defect that a clamped end of the test sample is broken due to the pin connection can be overcome, the test failure probability is reduced, and the problems such as data inaccuracy, resource waste and the like can be avoided. The structure of the test sample is not only suitable for the high-temperature lasting and creep deformation of the plate-like test sample, but also suitable for testing mechanical performances of the plate-like test sample such as single-shaft tensile at a room temperature and high temperature, tensile fatigue and the like.

In an electric power steering apparatus that generates an auxiliary steering torque by a brushless motor in response to a steering torque applied on a steering wheel and transmits it to an output shaft of a steering mechanism while reducing it by means of a reduction gear, the apparatus comprises a rotor ( 10 ) to which a cylindrical permanent magnet for rotational driving ( 12 ) and a member to be detected ( 13 ) for detection of a rotational angle of the rotor are attached and a cylindrical stator ( 30 ) opposed to the rotor in which a laminated core ( 16 ) on which a coil is wound, detection means ( 17 ) for detecting the rotational angle of the rotor by the member to be detected and a terminal ( 19 ) for providing connection to the coil are integrally formed by resin molding. At least one bearing ( 8, 9 ) for rotatably supporting the rotor is disposed radially inside the stator and between the permanent magnet for rotational driving and the member to be detected.

The invention discloses a laser radar is based upon lame light source difference absorption process to test thickness of NO2 in the atmosphere, it includes lame light source, light incept and spectrum components, photo-detection and control transaction components, the characteristic is that the light incept and spectrum components accepts the scattered light from atmosphere backward by telescope tube of incept light, after coupling of light fiber, making the light to lay in the focal plane of lens, ripping into the raster by collimation lens, after section out the wave length of light 354.71nm and 360.00nm,recepted by the two emergent light fiber on the focal plane of lens. The raster is blazed grating, it has definite included angle with lens; the photo-detection and control transaction part includes microcomputer, data acquisition card, chronotron, enlarge shaping circuit, photomultiplier and photo-electricity probe. The invention has the beneficial purpose of easy structure, low cost, high diffraction efficiency, good flexibility, convenient using and vindicate etc.

The invention discloses a pump driven by a brushless direct current motor, a pump equipped with the brushless direct current motor as well as a manufacturing method of the brushless direct current motor for driving the pump. The brushless direct current motor of the pump comprises a motor shell and a motor shaft, wherein the motor shell comprises a lower end cover and an upper end cover, a statorpart is fixed between the lower end cover and the upper end cover, the motor shaft passes through the lower end cover and extends downwards, surrounding edges extending upwards are arranged at the periphery of the upper end cover, a circuit board chamber is arranged at the upper side of the upper end cover and is internally provided with a control circuit board and an encapsulating body made of encapsulating material, an internal lead of the control circuit board is connected with a connecting wire of the motor after passing through an internal lead hole on the upper end cover, and an external lead of the control circuit board passes through the encapsulating body and extends outwards. The control circuit board is sealed in the circuit board chamber in the way of encapsulating, and the encapsulating body can protect the control circuit board, ensure the reliability of motor control and operation, simplify the structure of the motor and facilitate the assembly of the motor.

The invention relates to a hydraulic winch, comprising a machine frame, a winding barrel, a hydraulic motor, and a hydraulic brake, a planet gear speed reducer and a hydraulic clutch which are arranged in the winding barrel. The hydraulic clutch comprises an outer barrel, a clutch friction plate and a clutch oil cylinder. A bearing shaft is fixed on the machine frame. The outer barrel and a piston of the clutch oil cylinder are fixed on the bearing shaft through bearings respectively. The piston is in transmission connection with an output end of a planet carrier of the planet gear speed reducer. The outer barrel and the piston are fixed on the bearing shaft, so that the outer barrel, the piston and the bearing shaft have a relatively high coaxiality, and a dynamical friction plate and a static friction plate which are arranged on the outer barrel and the piston respectively have relatively high parallelism. The dynamical friction plate and the static friction plate can be well contacted with each other and completely separated from each other as well so that the hydraulic winch has more stable and reliable clutch performance, and the abrasion and the heat generation of the clutch friction plate are reduced. In the hydraulic winch, transmission efficiency and operational reliability can be improved, and service life can be prolonged. The hydraulic winch has a simplified integral structure and higher machining and assembling manufacturability.

The invention discloses an installation device, relating to the technical field of mechanical assembly. The installation device is used for installing a shaft in a shaft hole of a shaft hole part and comprises a shaft hole part fixing device, a shaft fixing device and a support seat, wherein the shaft hole part fixing device is used for horizontally fixing the shaft hole part; the shaft fixing device is used for horizontally fixing the shaft; and the support seat is used for supporting the shaft hole part fixing device and the shaft fixing device; and the shaft hole center line of the shaft hole part fixed by the shaft hole part fixing device is aligned with the center line of the shaft fixed by the shaft fixing device. The shaft fixing device moves along the horizontal direction under the drive of a driving device. The installation device can accurately assemble the shaft and the shaft hole part and prevent collisions and gouges between the shaft and the shaft hole part in the installation process.

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 relates to a bubble atomizing nozzle and an adjusting method of the bubble atomizing nozzle. The bubble atomizing nozzle comprises a multi-channel air intake structure consisting of two or more layers of sealing rings, or an external part of an air intake structure of a swirl groove, and an external part having a diffusion conical spray hole, a jackscrew hole and an air-liquid inlet quick mounting joint, wherein the internal part is directly inserted in the external part to assemble the nozzle; the internal part and the external part are sealed by an O-shaped rubber ring and fixed by a jackscrew; and a space between the internal part and the external part is a mixing chamber. The flowing resistance of the internal part is lower, so that the pressure of the mixing chamber can be kept in a higher range, and the atomizing efficiency of the nozzle is higher; a bubble flow formed in the air-liquid two-phase mixing process in the mixing chamber is uniform and stable, so that the stable atomizing effect is realized under the low-air-liquid mass flow ratio (between 0.07-0.1); and the working pressure is low, and the liquid flow is low, so that the stable atomization can be kept under the liquid flow of 3.5-6.0 kg/h and the absolute air-liquid inlet pressure of 0.36-0.40 MPa. The bubble atomizing nozzle is applied to such fields as chemical engineering, motive power and heating and ventilation.

A spark plug is provided, for a provisional bending process for manufacturing the spark plug, as a work in a condition where an earth electrode is straight and substantially in parallel with an axial line of a center electrode. In the provisional bending process, two searchers individually facing the tip of the center electrode with the tip located therebetween are arranged, positions of the searchers in a first direction perpendicular to the axial line being adjusted for every spark plug. Then a bending punch is driven to press a second end-surface of the other end of the earth electrode down to the searchers so that the earth electrode is provisionally bent at a substantially perpendicular angle to the axial line, the second end-surface being opposite to the first end-surface. Preferably, before the provisional bending process, positioning the work and correcting the position and tilt of the work are performed.

The invention relates to the field of stress corrosion tests of metal and alloy thereof, in particular to a slow tensile test clamp of a thin-walled tube arc-shaped sample in a high-temperature high-pressure water environment and an application method of the slow tensile test clamp. The slow tensile test clamp is suitable for stress corrosion crack sensitivity study of a thin-walled tube in high-temperature high-pressure water. The clamp is composed of a sample clamping part and a clamp adaption part, the sample clamping part comprises a female die, a male die, a locating pin shaft and a fastening bolt, and the sample can be accurately located and completely fixed; the clamp adaption part comprises an external thread adaption part, an internal thread adaption part and a connecting pin shaft. The slow tensile test clamp can be fixed to an existing support and connected with a stretching shaft, and clamping and axial stretching of the thin-walled tube arc-shaped sample are achieved. The slow tensile test clamp is simple in structure and convenient to assemble, can achieve precise locating and completely fix the sample, and can achieve the slow tensile test of the thin-walled tube arc-shaped sample in the high-temperature high-pressure water environment.

The invention relates to the field of machinery, in particular to a universal ultrasonic-assisted inner jetted dielectric electric discharge machining (EDM) milling tool head. The universal ultrasonic-assisted inner jetted dielectric EDM milling tool head comprises an ultrasonic vibration portion, a knife handle and a knife bar. The knife handle is fixedly connected with an inner sleeve. The inner sleeve is fixedly connected with an amplitude-change pole. The bottom end o the amplitude-change pole is provided with the knife bar. An electrode is installed on the knife bar. The axis of the knife handle, the axis of the amplitude-change pole and the axis of the knife bar are coincident. An outer sleeve is arranged outside the inner sleeve and extends to the middle section of the amplitude-change pole. A cavity III is formed between the outer sleeve and the amplitude-change pole. The end of the cavity III is provided with a mechanical water seal. The interior of the amplitude-change pole is provided with a discharge medium circulating channel. The universal ultrasonic-assisted inner jetted dielectric EDM milling tool head has the advantages of being high in coaxiality, high in rotational speed and simple in structure.

An universal extender system of light beam consists of extender negative mirror and extender positive mirror. The system is featured as having a mirror tube with regulation handwheel, extender negative mirror, negative mirror frame, spring, positive mirror frame, extender positive mirror and pressing ring setting in sequence along light axis O1O2 in the mirror tube; coordinating the mirror frames closely with mirror tube, pushing against the mirror frames by spring and connecting handwheel to mirror tube with thread.

The invention discloses an internally-arranged angle sensor all-in-one ultrasonic motor servo control system and relates to servo control over ultrasonic motors. The internally-arranged angle sensor all-in-one ultrasonic motor servo control system comprises a command module, a compensation module, a digital processing module, a drive panel and an all-in-one actuating mechanism. The command module sends out commands to the compensation module, and the compensation module converts the commands into frequency control signals and transmits the frequency control signals to the digital processing module; the digital processing module processes the frequency control signals into square signals and transmits the square signals to the drive panel, the drive panel amplifies the square signals and then inputs the square signals to the all-in-one actuating mechanism, the all-in-one actuating mechanism is a hollow ultrasonic motor with an internally-arranged angle sensor, the angle sensor feeds back speed and position information, the speed and position information reaches the compensation module after passing through the drive panel and the digital processing module, through comparison, compensation and conversion, newly-generated frequency control signals are transmitted to the drive panel, and therefore closed-loop control is achieved. The internally-arranged angle sensor all-in-one ultrasonic motor servo control system has high reliability, high precision and good environmental suitability, and is especially suitable for being used as shaft end servo control systems of platforms with multi-degrees of freedom.