252 results about "Radial clearance" patented technology

The invention discloses a spherical roller bearing entity simulation method, device and equipment and a medium, and relates to the technical field of wind power generation. According to the scheme, when the finite element mesh model of the spherical roller bearing is constructed, the rollers are connected to the bearing inner ring and the bearing outer ring through the spring units, that is, traditional finite element constraint is replaced with the mode that the rollers are constrained through the spring units, and the conventional constraint limitation in finite element simulation is broken through; accurate analysis of bearing roller contact in a complete machine model is realized; after a complete machine finite element mesh model is generated based on a model of the spherical roller bearing, simulation parameters and loading parameters of the complete machine finite element mesh model are set, the simulation parameters at least comprise a working clearance between a roller and a raceway, that is, contact offset is added to simulate the existence of the radial clearance of the bearing, and the loading parameters of the complete machine finite element mesh model are set. The problem of simulation of play contact of the SRB main bearing under the working condition of high axial force is solved, and three-dimensional balance of physical authenticity, calculation efficiency and engineering applicability is achieved.

A front cover and a rear cover are fixedly installed and define a cavity, a driving gear shaft and a driven gear shaft are installed in the cavity, a first gear on the driving gear shaft is meshed with a second gear on the driven gear shaft, and the two gears and the inner wall of the cavity define an oil suction cavity and an oil discharge cavity. The two floating side plates are arranged on the two sides of the two gears in a penetrating mode through the driving gear shaft and the driven gear shaft respectively, an ear-shaped high-pressure oil groove and an unloading groove are formed in the face, close to the gears, of each floating side plate, the ear-shaped high-pressure oil grooves are close to one side of the oil discharge cavity, the unloading grooves are close to one side of the oil suction cavity, and the two ends of the unloading grooves are communicated with through holes of the floating side plates respectively. An ear-shaped groove is formed in the face, away from the gear, of each floating side plate, and a compensation area is formed on the floating side plates around the ear-shaped grooves. And a radial gap is formed between the peripheral edge of the floating side plate and the inner wall of the cavity. The comprehensive performance of high pressure, large displacement, low noise and high efficiency of the bevel gear pump is improved.

The invention discloses a rotary machine dynamic balance optimization method based on an attitude performance correlation model, and relates to the technical field of rotary machine dynamic balance optimization. Comprising the following steps: S1, synchronously collecting rotor vibration signals and temperature field data through temperature and vibration sensors, carrying out real-time calibration on structure parameters, substituting a temperature compensation algorithm to calculate interference components, and outputting pure vibration deviation data subjected to temperature compensation; the structural parameters comprise a rotor thermal expansion coefficient, a bearing radial clearance temperature attenuation coefficient and inherent or dynamic characteristic parameters related to material properties, geometric dimensions and connection states of the rotary machinery. The method has the advantages that through deep combination of vibration and temperature, a temperature-frequency spectrum-amplitude three-dimensional coupling traceability matrix is constructed; multi-feature matching is achieved through a fusion algorithm, temperature-dominated vibration sources and mechanical-dominated vibration sources can be clearly distinguished, and the accuracy of the dynamic balance optimization direction is guaranteed.

The invention discloses a radial clearance dynamic sensing and mud-effect-preventing grouting system which comprises a shield body, a cutterhead rotationally connected to the front end of the shield body through a rotating mechanism, a displacement sensor, a grouting pipe and a slurry feeding part. A plurality of radial grouting holes are formed in the outer wall of the front end of the shield body; a plurality of displacement sensors are fixed on the periphery of the cutter head; the grouting pipe comprises an outer pipe and an inner pipe; one end of the outer pipe is rotatably connected to the middle of the shield body, and the other end extends along the inner wall; the inner pipe is coaxially and slidably connected to an inner cavity of the outer pipe, the discharging end of the inner pipe slidably penetrates through the radial grouting hole, and the feeding end of the inner pipe communicates with the slurry feeding part through a connecting pipe. The displacement sensor is in communication connection with the slurry feeding part. The multiple sensors are used for sensing the gaps among the cutter head, the shield body and the soil body, grouting is conducted in cooperation with the slurry feeding part and the grouting pipe so as to compensate the gaps, stratum sedimentation can be effectively reduced, accurate grouting can be conducted on the radial grouting holes in different positions through rotation of the outer pipe, the grouting efficiency is higher, and the grouting opportunity is better mastered.

The utility model relates to the technical field of multi-stage pumps, in particular to an axial force balancing structure of a multi-stage pump, which comprises a balancing structure body, a last-stage impeller arranged on one side of the balancing structure body, a rotating shaft fixedly sleeved in the last-stage impeller, a bearing seat rotatably sleeved at one end of the rotating shaft, and a sealing piece mounted on one side of the bearing seat. A balance disc is arranged on one side of the sealing piece, a balance plate is installed on one side of the balance disc, a radial gap is formed in one side of the balance plate, and an axial gap is formed in the other side of the balance plate. The centrifugal pump has the advantages that liquid with pressure from the last-stage impeller flows into the water chamber between the balance plates through the radial gaps between the balance plates and the balance discs, so that the water chamber is in a high-pressure state, the balance pipe arranged on one side of the balance disc is connected with an inlet of the pump, the pressure of the balance pipe is approximate to the pressure of the inlet of the pump, and the pressures on the two sides of the balance disc are not equal; and through the matching of the radial clearance and the axial clearance, the axial force is balanced by means of the pressure difference generated by the radial clearance and the axial clearance on the leakage of water.

The present invention relates to the technical field of bearing detection, and specifically provides a bearing clearance detection device, which includes a machine table, and a workbench and a feeding mechanism are arranged at the upper end of the machine table; a first detection station, a first NG station, a second detection station, a second NG station, a third detection station, and a third NG station are sequentially arranged on the workbench; a flexibility detection mechanism, a first kicking mechanism, an axial clearance detection mechanism, a second kicking mechanism, a radial clearance detection mechanism, and a third kicking mechanism are sequentially arranged along one side of the workbench; the present invention integrates the detection of the rotational flexibility, axial clearance, and radial clearance of the bearing on the same device, with a high degree of overall automation and mechanization, effectively improving the detection efficiency of the bearing; the clearance detection of the bearing can be achieved by detecting the deformation amount of the elastic body, without inserting a measuring pen into the bearing, which can avoid problems such as lubricating oil pollution and wear, and improve the finished product quality of the bearing products.

According to the loading device and method for the vibration test of the brake, a motor flexible shaft drives a driving mechanism to rotate to transmit power to the input end of a product, the output end of the product loads axial force through a thrust mechanism, and an eddy current sensor assembly is used for measuring the radial clearance variation of a spline of the product under a vibration load. The device can simulate and measure the actual use condition and vibration performance of a product on an airplane, can truly examine the performance and reliability of the product under the vibration test condition, is convenient to operate, can meet the vibration test requirements of products of the same type and different specifications, and has high applicability.

The invention provides a fixing clamp device and cutting equipment, and relates to the technical field of cutting equipment, the fixing clamp device comprises a shell and a driving part, the outer surface of a fixing shaft is provided with a limiting surface, the fixing clamp device is provided with a limiting matching surface, and the limiting matching surface and the limiting surface are oppositely arranged. The fixing clamp device is provided with a driving piece. The driving piece drives the fixing shaft to move along the axis of the first opening, so that the limiting face can abut against the limiting matching face in the radial direction of the driving piece. The limiting face and the limiting matching face are arranged in an attached mode, the radial shaking amount between the fixing shaft and the fixing clamp device is eliminated, the situation that due to the fact that radial deviation force exists between the power source and the fixing clamp device in a transmission mode, the moving of the fixing shaft deviates or is eccentrically abraded is avoided, the service life of the fixing clamp device is prolonged, and the reliability of the fixing clamp device is improved. In addition, the radial fit clearance is eliminated through the driving part, the requirement for the assembly precision of the fixing shaft and the fixing clamp device is lowered, and the production quality and production efficiency of the whole cutting equipment are improved.

The invention relates to the technical field of compressor equipment, and discloses a screw air compressor which comprises a shell and an exhaust end seat, a rotor set is installed in the shell, the shell and the exhaust end seat are fixed together through bolts, and a rotor shaft of the rotor set penetrates through the exhaust end seat and is connected with a supporting bearing and a positioning bearing. The end part of the exhaust end seat is fixedly connected with a gland, an adjustable cushion cover is arranged between the positioning bearing and the supporting bearing, the adjustable cushion cover comprises a positioning sleeve, one end of the positioning sleeve is movably sleeved with a telescopic head, and the other end of the positioning sleeve is in threaded connection with an adjusting pipe. The thickness of the adjustable cushion cover can be conveniently adjusted, the thickness of the adjustable cushion cover can exactly enable the exhaust gap to be within the optimal range, meanwhile, the gap between the locking pin and the positioning ring is within the proper range, when the radial internal clearance of the rotor set is enlarged, an observation groove in the positioning ring is easily worn through, lubricating oil in the exhaust end seat can partially flow out, and the exhaust effect is improved. And direct observation by external maintenance personnel is facilitated.

This invention provides an electronic expansion valve, comprising: a nut assembly including a nut and a connecting plate sleeved on the nut, the connecting plate and the nut having a radial clearance fit; a valve seat, the outer wall of the connecting plate being fixedly connected to the valve seat, the connecting plate and the valve seat having an axial clearance fit in the nut; and a guide sleeve fixedly disposed within the cavity of the valve seat, the guide sleeve being inserted into the nut, the guide sleeve and the nut abutting axially and having a radial interference fit. This design ensures the coaxiality of the guide sleeve and the nut by limiting their relative movement in the axial and radial directions. Furthermore, given a fixed coaxiality between the nut and the guide sleeve, sufficient adjustment clearances are provided between the connecting plate and the nut, and between the connecting plate and the valve seat, preventing over-positioning of the connecting plate during installation from affecting the coaxiality between the nut and the guide sleeve, thus improving the coaxiality of the nut assembly and ensuring the performance of the electronic expansion valve.

The invention relates to the technical field of turbine manufacturing and maintenance, in particular to a turbine bearing and rotor journal clearance measurement method, which comprises the following steps of part in-place, gasket group arrangement, simulation compression and equivalent clearance measurement. Measuring an equivalent gap Se of at least one position at a gap between the bearing upper half tile and the rotor shaft neck in a state of maintaining the pre-tightening force; wherein the preset thickness T is set according to the target bearing top clearance C, and the target bearing top clearance C is equivalently realized and verified by controlling the thickness of the gasket group; according to the method, the radial clearance is indirectly and accurately determined by controlling the pressing position of the split of the bearing, the set value of the top clearance is verified, efficient and visual evaluation of the size of the backlash and the axial uniformity of the clearance is achieved through the geometrical relationship in the stable state, and more direct and accurate clearance verification is achieved.

This utility model provides an internal gear pump with crescent-shaped blocks, including a pump body, a pump cover, an internal gear ring, and an external gear meshing with the internal gear ring. An outer crescent-shaped block and an inner crescent-shaped block are disposed between the internal gear ring and the external gear. The outer crescent-shaped block has an outer arc surface that can engage with multiple tooth tips of the internal gear ring. The inner crescent-shaped block is composed of a first inner crescent-shaped block and a second inner crescent-shaped block, both of which have inner arc surfaces that can engage with multiple tooth tips of the external gear. A positioning pin is installed between the first and second inner crescent-shaped blocks. A pin hole is provided at one end of each of the first and second inner crescent-shaped blocks near the positioning pin for installing a rotating pin. The first and second inner crescent-shaped blocks can rotate around the rotating pin. A notch is provided in the middle of the outer crescent-shaped block corresponding to the positions of the two positioning pins. Rubber rods and springs are provided between the outer crescent-shaped block and the first and second inner crescent-shaped blocks to compensate for the radial clearance between the inner and outer crescent-shaped blocks.

The application provides a floor grinding machine gear box guide plate structure parameter optimization design method, which is used for determining the optimal values of three radial clearances between the guide plate and the gear tooth top. Firstly, a parameterized gear box model containing clearance as a variable is constructed, and a gear oil stirring loss theoretical model is established based on the boundary layer theory and the fluid resistance theory; taking the maximum lubrication efficiency as the target and the oil stirring power loss not exceeding the set threshold as the constraint condition, a central composite design method is used to select representative sample points in the design space; through computational fluid dynamics simulation, a moving particle semi-implicit method is used for splash lubrication transient analysis to obtain performance data of each point; based on the simulation data, a high-precision proxy model is constructed; finally, under the condition of meeting the oil stirring power loss constraint condition, the maximum lubrication efficiency is taken as the target for optimization solving to obtain the optimal clearance combination. The method realizes the quantitative design from parameters to performance, and effectively replaces the traditional trial and error method.

The utility model relates to the field of detection, in particular to a bearing radial clearance detection device which structurally comprises a bottom plate, a shaft seat, a second stand column and a first stand column which are arranged on the surface of the bottom plate, a movable adjusting handle and a top column which are arranged on the top of the shaft seat, and a clamping block which is arranged on the top of the second stand column. The tool is characterized in that a sliding limiting transverse shaft is arranged on the surface of the first stand column, the limiting transverse shaft comprises a clamping wheel and a clamping column, a detachable positioning block is installed on one side of the clamping column, the positioning block is matched with a sliding groove in the surface of the first stand column, the clamping wheel is in threaded fit with the front end of the clamping column, and the clamping wheel is in threaded fit with the clamping column. The opposite faces of the clamping column and the clamping wheel are provided with multi-diameter ejector blocks, the improved device is sleeved with the second sleeve rod and the third sleeve rod through the first sleeve rod, and then the improved device can adapt to bearing inner rings with more diameters. And matched bosses are arranged on the surfaces of the clamping wheels and matched with the third sleeve rod, the second sleeve rod and the first sleeve rod.

The present invention discloses a structure and method for suppressing radial shaking of a motor joint of a robot arm. The present invention can effectively suppress shaking of the end of the robot arm caused by radial shaking of the output end of the motor itself. For a robot arm whose integrated motor reducer section adopts a gear reducer and cooperates with a non-crossed roller bearing output, the output shaft of the integrated motor has a large radial shaking due to the influence of the radial clearance of the gear system and the radial clearance of the bearing. For a robot arm directly driven by a motor, the radial shaking of the output shaft will be amplified at the end of the robot arm, seriously affecting the trajectory accuracy of the end of the robot arm. The present invention designs a shaking suppression structure outside the output shaft of the integrated motor, provides a configuration strategy for the entire robot arm and a design method for core parts, and increases radial support for the output shaft, so that the radial shaking of the end of the robot arm is suppressed and the trajectory accuracy of the end is improved.

The invention relates to the field of bearing measurement, in particular to clearance detection equipment for bearing manufacturing, which comprises a workbench and a control cabinet, and is characterized in that two groups of dial indicators which are oppositely arranged are linked with a pressing cylinder capable of transversely swinging, and on the basis that an inner ring and an outer ring are synchronously fixed, when the pressing cylinder drives the outer ring to swing, the dial indicators are driven to rotate; the connecting frames on the two sides touch the measuring ends of the dial gauges respectively, and the two dial gauges independently record the radial displacement on the two sides of the inner ring in real time. By comparing the two groups of data, the overall radial clearance value can be obtained, whether the clearances on the two sides are symmetrical or unbalanced loading exists or not can be more accurately judged, and the technical limitation that an existing device cannot compare the clearances on the two sides is effectively overcome; meanwhile, automatic centering of the dial indicator is achieved through guiding of the positioning rod and the inclined face of the conical positioning groove, floating matching of the connecting cylinder and the connecting rod and buffering of the spring can adapt to the height of the bearing, the servo motor is combined to drive the bearing base to rotate to obtain multi-phase clearance data, and reliable support is provided for comprehensive evaluation of the bearing quality.

The application provides a design and calculation method of main parameters of helical gear flowmeter, and belongs to the technical field of flowmeter. The design and calculation method is obtained by theoretically analyzing the helical gear flowmeter, and the influence of the number of gears, modulus, pressure angle, helix angle, radial clearance of the flowmeter and end face clearance of the flowmeter on the flow pulsation, clearance flow leakage and power loss of the helical gear flowmeter is discussed. In combination with the particle swarm optimization algorithm, two of the three performance indexes, flow pulsation, leakage and power loss, are changed into constraint conditions according to the design requirements, so that the multi-objective problem is changed into a single-objective problem for solving the main parameters of the helical gear flowmeter. Compared with the traditional method of calculating the displacement of the flowmeter through the empirical formula and the empirical coefficient, the application can improve the displacement design precision of the flowmeter, can clearly determine the influence degree of each parameter on the performance of the flowmeter, and can quickly solve the main parameters of the helical gear flowmeter through the optimization algorithm.

The present invention discloses an internal-meshing RV-C reducer for industrial robots. After the cycloid wheel is reshaped, a reasonable clearance (radial clearance Δj and side clearance Δc) is generated between the inner cycloid teeth and the cycloid tooth grooves. This prevents the meshing parts from getting stuck when the cycloid wheel thermally expands under rated load. Furthermore, the structure of the inner cycloid gear ring is simplified and the load-bearing capacity is improved through concave-convex meshing.

A tool holder, for a tool assembly, comprising a tubular element having a cavity and a central axis; a damping mass arranged within the cavity and movable radially with respect to the central axis and relative to the tubular element; an adapter having a rear part fixed to the tubular element, and a front part for connection to an end effector of the tool assembly, the rear part comprising an opening, and the damping mass is at least partly received in the opening with a radial clearance; and an elastic element positioned between the adapter and the damping mass, the elastic element being arranged to support the damping mass and to damp radial vibrational movements of the damping mass relative to the tubular element, and the elastic element comprising a front surface substantially perpendicular to the central axis and a rear surface substantially perpendicular to the central axis.

The utility model discloses a fixture capable of adaptively fixing a grinding tool. The fixture comprises a fixture main body and an expansion part, the clamp body comprises a disc base and a cutter handle, a through hole is formed in the disc base along the central axis, and the cutter handle is arranged on the disc base through the hole. The expansion part comprises an inner supporting sleeve and a conical screw; the bottom edge of the inner supporting sleeve is fixedly connected with the disc base, the inner supporting sleeve comprises a plurality of inner supporting assemblies, the inner supporting assemblies are fixed to the periphery of the conical screw, the radial width of one end of the conical screw is gradually increased in the direction away from the disc base, and when the conical screw is pressed downwards, the conical screw is fixed to the disc base. The inner supporting assemblies elastically expand outwards. Due to the arrangement of the conical screw and the inner supporting sleeve, the radial gap between the clamp and the grinding tool is reduced, and looseness of the clamp and the grinding tool in the machining process is reduced.

The invention discloses a gas turbine blade tip radial clearance adjusting device and method and a mounting method.The device comprises a fixing ring (1), an adjusting part (2) and a cylinder jacking device (3), the adjusting part (2) surrounds the fixing ring (1) in the radial direction and is fastened, the cylinder jacking device (3) is detachably connected to the adjusting part (2), and the cylinder jacking device (3) exerts force in the radial direction of the fixing ring (1), so that the gas turbine blade tip radial clearance is adjusted. The device is used for controlling deformation of an air cylinder and adjusting blade tip radial clearances. The invention further comprises a mounting method and a gap adjusting method of the using device, the adjusting method comprises the steps that blade tip gap values are collected in real time after a test is started, if the blade tip gap values are smaller than a safety value, the cylinder deformation quantity needing to be adjusted is calculated according to the blade tip gap values in all directions of a cylinder body, and the cylinder deformation quantity is adjusted. The force application position and the force application value are calculated according to the cylinder deformation quantity, and the cylinder ejector (3) is controlled to adjust the blade tip clearance value according to the force application position and the force application value.

A vibration-damping cylindrical roller bearing with adjustable radial clearance and a method for adjusting the clearance thereof relate to the technical field of rolling bearings. The purpose of the present invention is to solve the vibration problem caused by insufficient radial preload, which causes rolling element slippage, manufacturing accuracy, installation errors, external abnormal loads, and the like during the operation of the cylindrical roller bearing. The present invention quickly adjusts the bearing clearance by arranging a preload adjustment vibration damping body made of damping metal inside the rolling element of the cylindrical roller bearing, thereby improving the operating stability of the cylindrical roller bearing, especially the high-speed cylindrical roller. At the same time, the preload adjustment vibration damping body made of damping metal supports the rolling element at the core of the rolling element, does not affect the bearing load-bearing performance, and avoids contact between the preload adjustment vibration damping body and the raceway, thereby attenuating the vibration transmitted by the rolling element. The present invention can obtain a vibration-damping cylindrical roller bearing with adjustable radial clearance and a method for adjusting the clearance thereof.

This disclosure provides a wind turbine generator system, including a base, a column, a rotor assembly, a blade assembly, a stator assembly, and an energy storage component; the column is vertically mounted on the base; the rotor assembly includes multiple spaced-apart segmented rotors, with an axial clearance between adjacent segmented rotors of [value missing]. λ1 The wind turbine assembly includes at least one blade; the stator assembly includes multiple segmented stators spaced apart on the column, with an axial clearance of λ2 between adjacent segmented rotors; a coil winding connected to the energy storage component is provided on one of the stator assembly and the rotor assembly; the stator assembly and the rotor assembly are nested together, with a radial clearance δ between the segmented stators and segmented rotors in the radial direction of the column, 0 < δ ≤ λ1 ， And δ≤ λ2 ； The segmented stator and segmented rotor are radially opposite each other on the column and have magnetic attraction between them. The axial component of the magnetic attraction is balanced by the sum of the weights of the fan blades and the rotor assembly. This scheme can improve the axial magnetic levitation stiffness to reduce the possibility of system damage.

The present invention discloses a coaxial power output shaft gearbox and a machine equipped with the coaxial power output shaft gearbox. It includes a gearbox housing, on which a bearing hole is provided. The outer ring of a tapered roller bearing is arranged in the bearing hole, and a coaxial shaft is arranged in the inner ring of the tapered roller bearing; a cover is provided at a position on the gearbox housing corresponding to the bearing hole, and a fixed ring is arranged on the gearbox housing outside the bearing hole, and the cover is arranged outside the fixed ring; a moving ring is connected by thread in the fixed ring, and the moving ring contacts the outer ring of the tapered roller bearing; a locking groove hole is arranged on the moving ring; a protrusion for locking the moving ring is provided on the cover corresponding to the locking groove hole, or a locking ring adapted to the locking groove hole is arranged between the fixed ring and the cover for locking the moving ring. The coaxial power output shaft gearbox of the present invention can effectively solve the problem that the axial clearance of the tapered roller bearing is too large or too small due to using a paper gasket to adjust the radial clearance of the tapered roller bearing in the current gearbox.

A cylinder lock (1) which comprises a stator (2) which is provided with a substantially cylindrical longitudinal cavity (3) for accommodating a rotor (4) with a longitudinal recess (5) for the insertion of a coded key (6). The rotor (4) and the stator (2) comprise a plurality of channels (7), which are substantially aligned and facing when the cylinder (1) is in the locked configuration, for accommodating respective pins (8), counterpins (9) and optional elastic means (7a) which are adapted to prevent the rotation of the rotor (4) in the stator (2) in the absence of the correct coded key (6) from the longitudinal recess (5). The lock (1) has conduits (10) unaligned with respect to and located opposite to the channels (7) at a respective longitudinal groove (11) of the stator (2) and which are configured to moveably accommodate respective pegs (12) which have a head (13) adapted to rest on the coded surface (14) of the key (6) and a toe (15) configured to be temporarily accommodated in the longitudinal groove (11) when a key (A, B, C) inserted in the recess (5) does not have the correct coding, thus preventing the rotation of the rotor (4) in the stator (2). The cylinder lock (1) comprises at least one active peg (16) constituted by a hollow half peg (16a) and a contoured half peg (16b) which is configured to be accommodated, with a predefined mechanical play, in the hollow half peg (16a) and at least one passive peg (17) of length substantially corresponding, minus a predefined play, to the sum of the axial length of the respective conduit (10) that accommodates it and of the depth of the corresponding coding pit (18a) on the respective coded surface (14) of the key (6) when the latter is completely inserted in the longitudinal recess (5). The key (6) comprises at least one longitudinal groove (19), which is at least partially aligned with the respective coded regions of the surface (14), and has a depth not lower than the protrusion, measured in a radial direction, of the passive peg (17) from the respective conduit (10), while a respective toe (17b) of the peg (17) is completely accommodated in the groove (11), minus a predefined radial play.

To provide a stator that can improve the workability of an insulator installation process.SOLUTION: A stator 20 comprises: a stator core 21 having a cylindrical cylinder part 211, a plurality of teeth parts 212 projecting radially outward from an outer peripheral surface of the cylinder part 211, curved surface parts 213 projecting in a circumferential direction from the tips of the teeth parts 212, and slots each formed between the adjacent teeth parts 212; a pair of insulators 22, 23 that sandwich the stator core 21 from both sides in an axial direction; and a winding that is wound around the stator core 21 with the insulators 22, 23 therebetween. The insulators 22, 23 each have a base formed of surfaces orthogonal in the axial direction, and a plurality of wall parts extending in the axial direction from the base along a core inner surface part 215 surrounding the slots in the stator core 21. A radial clearance between the wall part and the cylinder part 211 and a radial clearance between the wall part and the curved surface part 213, is larger than a circumferential clearance between the wall part and the teeth parts 212.SELECTED DRAWING: Figure 2

The invention belongs to the field of engine rotor and stator design, and particularly relates to an engine rotor and stator coaxiality eccentricity optimization method, which comprises the following steps: establishing a measurement reference coordinate system and a least square circle for an elastic support bearing in a structure simplified model in a matching manner, and obtaining discrete sampling point position data on the least square circle; calculating the downward eccentricity c of the elastic support by adopting a least square method; a high-pressure turbine process shaft is designed and is in centering fit with a high-pressure compressor rotor rear shaft, and a labyrinth simulation surface is designed; the final eccentric adjustment amount of the coaxiality of the sealing labyrinth and the air oil retainer is calculated; the influence of engine rotor shaft fit clearance, bearing radial clearance and static elastic support deformation on the coaxiality of the rotor and the stator can be measured and determined in advance, a high-pressure turbine simulation process shaft is designed, and eccentric compensation adjustment is performed on the engine rotor and the stator during assembly, so that the engine rotor and the stator are finally coaxial after being assembled, and collision and abrasion of the rotor and the stator are avoided; the service life of the engine is prolonged and the maintenance cost of the engine is reduced.

This invention relates to the field of wear-resistant pipe welding, specifically to a wear-resistant pipe circumferential welding device. The device includes a base with a sliding support platform on its upper end. Clamps are symmetrically arranged at one end of the support platform. Each set of clamps includes an inner edge clamping member and an outer edge clamping member arranged opposite each other, enabling bidirectional end-face positioning and fixation of the curved wear-resistant pipe end. A double-end welding mechanism is located on the side of the support platform near the clamps. The double-end welding mechanism includes two coaxially rotating trays with radial clearance notches. Welding torches are mounted on the facing end faces of the trays. The two welding torches can be adjusted to an initial position with a 180° included angle, and rotate synchronously and in the same direction with the trays to complete the circumferential welding of the curved wear-resistant pipe. This device offers high clamping and positioning accuracy for curved wear-resistant pipes, effectively suppressing welding deformation, significantly improving welding quality and work efficiency, and solving the technical problems of clamping instability, low coaxiality accuracy, and large welding deformation in existing technologies for welding curved wear-resistant pipes.

A clutch device selectively transfers rotational driving force from an input shaft to an output shaft. The device comprises a clutch center housed within a clutch housing and configured to hold alternating input-side and output-side rotating plates. The input-side rotating plates are rotationally driven by the input shaft, while the output-side rotating plates rotate with the output shaft via the clutch center. A pressure plate, movable axially relative to the clutch center, presses the alternating rotating plates into engagement. A stopper plate limits the axial separation of the pressure plate from the clutch center. The pressure plate includes circumferentially arranged pressure-side fitting teeth and a flange for pressing the rotating plates. The clutch center includes radially outwardly projecting fitting teeth arranged circumferentially. In an engaged state, radial clearance between the clutch center fitting teeth and pressure-side fitting teeth is smaller than axial clearance between ends of the clutch center fitting teeth and the flange, enhancing stability and alignment during clutch engagement.

The utility model discloses a two-stage thrust cylinder which comprises a cylinder bottom, a cylinder barrel, a guide sleeve, a piston rod, a rod head and a piston. A central tube arranged in a radial clearance is fixedly arranged in an inner hole of the piston rod, a cavity extending oil port connected with the front end of the inner hole of the central tube is formed in the rod head, and the rear end of the inner hole of the central tube is communicated with a rodless cavity behind the piston; a shrinkage cavity oil port connected with the front end of the shrinkage cavity oil duct is formed in the rod head, a plug is fixedly arranged at the rear end of the shrinkage cavity oil duct, and a connecting oil way communicating an inner hole of the piston rod with a rod cavity is arranged in the piston rod. A fixed flange plate is fixedly connected outside the front end of the cylinder barrel, a pull-back clamping key groove is formed in the outer circle of the cylinder barrel, a front clamping key groove and a rear clamping key groove are formed in the outer circle of the cylinder bottom, and a movable clamping key is matched with the pull-back clamping key groove, the front clamping key groove and the rear clamping key groove. The long-stroke propelling device can achieve long-stroke propelling, is simple in structure and low in cost, and can meet the requirement of a stable working state due to the fact that thrust and rigidity are not different in the propelling process.