676 results about "Axial load" patented technology

The invention relates to the technical field of material fatigue performance testing, in particular to a fatigue acceleration detection method and system for a high-fatigue-resistance cast wheel, and the method comprises the steps: generating a dynamic load spectrum containing a multi-axis combined load according to the actual operation condition of a target cast wheel; applying a dynamic load spectrum to the target casting wheel to perform an acceleration test, and monitoring dynamic strain responses on the surface and inside of the target casting wheel in real time based on the distributed sensing array; establishing a damage accumulation calculation model by taking a loading parameter of the dynamic load spectrum as an additional correlation condition, and calculating an equivalent fatigue damage accumulation value based on the dynamic strain response; when the equivalent fatigue damage accumulated value reaches a preset damage threshold value, it is judged that the target cast wheel reaches the fatigue life end point, and the damage evolution rule in the acceleration test is kept consistent with the damage mechanism of the actual operation working condition. According to the invention, the problems of multi-axis load simulation distortion, incomplete damage monitoring, low service life prediction precision and the like in traditional fatigue detection are effectively solved.

The invention relates to a pre-compensation flexible assembling and adjusting mechanism of a large-diameter transmission reflector. The pre-compensation flexible assembling and adjusting mechanism comprises the large-diameter transmission reflector, a glue joint mandrel, an isolation telecentric flexible hinge, an isolation plate, a hooke flexible hinge, an adjusting flexible branch chain, an anti-rotation flexible branch chain, a back plate and a driving assembly. The large-aperture transmission reflector is provided with three blind holes for glue joint, and is connected with the isolation plate through three groups of glue joint mandrels and isolation telecentric flexible hinges, so that isolation of load deformation interference of the isolation plate is realized; the driving ends of the two adjusting flexible branch chains are correspondingly connected with two driving assemblies installed on the back plate, and the connecting ends of the adjusting flexible branch chains are connected with the isolation plate. One ends of the Hooke flexible hinges and the anti-rotation flexible branch chains are connected with the isolation plate, and the other ends are connected with the back plate; the device has the advantages of being simple in structural form, stable in movement and high in precision, meanwhile, the return clearance caused by axial load reversing under heavy loads can be avoided, the additional surface shape caused by assembling and adjusting stress is effectively isolated, and the additional surface shape caused by gravity is compensated.

The invention discloses an axial-radial integrated loading rotating shaft bush high-temperature swing friction-wear testing machine, and belongs to the technical field of friction-wear testing, the axial-radial integrated loading rotating shaft bush high-temperature swing friction-wear testing machine comprises a bottom plate, a loading module is arranged on the bottom plate, one side of the loading module is connected with a high-temperature clamp module, one side of the high-temperature clamp module is connected with a motion generation module, and the motion generation module is connected with the loading module. One side of the motion generation module is connected with an electric control box body, and one side of the electric control box body is connected with a control computer. According to the axial-radial integrated loading rotating shaft bush high-temperature swing friction wear testing machine disclosed by the invention, synchronous application of an axial load and a radial load is realized through cooperative control of double stepping motors in the loading module; meanwhile, the influence of the coupling on torque measurement is effectively eliminated through the self-designed coupling, and the accuracy of synchronous application is improved.

The invention provides a data twin-driven automobile precision shaft fault prediction system and method, and relates to the technical field of fault prediction, and the method comprises the steps: building a digital twin model for precision shaft fault prediction based on the working condition operation data of a precision shaft; determining the correlation constraint quantity of each sensor according to the correlation elements of the monitoring data among the sensors in the multi-source sensor network, and determining the state credibility of each sensor through all the correlation constraint quantities and the interference characteristics of the multi-source sensor network; a failure mechanism model of the precision shaft is constructed based on material characteristics and working condition operation data of the precision shaft, state reconstruction is carried out on the failure mechanism model through an axial load and hardness obtained through a precision shaft test, and a digital twinborn model is updated according to reconstructed failure parameters and all state credibility sums. And predicting the fault state of the precision shaft through the updated digital twin model, so that dynamic updating of the digital twin model can be realized, and the precision of fault prediction of the precision shaft is improved.

The invention relates to the technical field of bearing measurement, and discloses a multifunctional measuring instrument for comprehensive precision of a rolling bearing. The driving device is mounted on the working platform and comprises a load block capable of axially moving and a motor assembly for driving the load block to rotate; the measuring device comprises a high-precision inductance measuring head for detecting the runout of the bearing to be measured and a pressure sensor for monitoring an axial load; the fixing device is a replaceable mandrel base and is used for supporting an inner ring or an outer ring of the bearing to be detected; wherein the driving device applies an axial load to an inner ring or an outer ring of a to-be-measured bearing through the load block and drives the to-be-measured bearing to rotate, the measuring device synchronously collects bounce and load data of the to-be-measured bearing, the brushless motor and the load block are connected through the magnetic coupling, and the centering error of the mechanical coupling is eliminated. Meanwhile, motor vibration is prevented from being transmitted to the to-be-tested bearing, the pushing force air floating shaft sleeve actively counteracts the magnetic attraction force, and the stability of the load applied to the to-be-tested bearing is remarkably improved.

The invention relates to a tension-torsion combined load test device for a rotary connector, and relates to the technical field of crossing of mechanical engineering and material testing technologies, and the tension-torsion combined load test device comprises a working box, a shell, an automatic clamping assembly, a workpiece hoisting assembly, an axial load applying assembly and a torque applying assembly, the automatic clamping assembly and the torque applying assembly are arranged on the upper surface of the shell in a penetrating mode. A first forward and reverse motor drives a first gear and drives a second gear and a forward and reverse threaded column to rotate, so that two sets of U-shaped movable plates synchronously move in the same direction or in the opposite directions, after the first forward and reverse motor is started, the rotary motion is converted into rotation of the threaded column through gear transmission, and the U-shaped movable plates linearly move along limiting grooves under the action of threads; the clamp claw is driven to realize automatic clamping or loosening, manual operation is replaced, accurate and uniform clamping force is realized, loosening or deviation caused by human factors is avoided, and the reliability of test data is improved.

A surrounding rock deformation and failure test system with a rotatable stress main shaft in a three-dimensional crustal stress field is characterized in that a press machine upper pressure head and a press machine base are oppositely distributed up and down, and a loading hydraulic cylinder is connected with the press machine upper pressure head; the surrounding rock sample is vertically arranged in the axial loading space, and a simulation roadway is formed in the axis part of the surrounding rock sample; annular upper and lower end plates are fixedly connected in the upper and lower ends of the confining pressure cylinder respectively; the confining pressure cylinder sleeves the outer side of the axial loading space; a plurality of groups of mounting holes are uniformly formed in the circumferential directions of the annular upper and lower end plates; the radial pressurizing assembly comprises a supporting steel pipe and an elastic capsule. The main supporting section is sleeved with the elastic capsule, and a plurality of through holes are formed in the main supporting section. A plurality of strain bricks are pre-buried in the surrounding rock sample; the track is fixedly mounted in the simulated roadway; the micro camera is assembled on the track through the electric control trolley; and the strain gauge II and the acoustic emission probe are arranged in the simulated roadway. According to the system, the working condition that the direction of a stress field changes can be simulated in a three-dimensional true triaxial stress environment.

The batten type water lubricated bearing comprises a shaft sleeve and a plurality of composite battens which are installed on the inner wall of the shaft sleeve at intervals in the circumferential direction of the shaft sleeve, and the composite battens comprise the first battens installed in a bearing area of the bearing and the second battens installed in a non-bearing area of the bearing. A through type variable cross-section groove is formed in the side, away from the ship stern shaft, of the first batten in the length direction of the first batten, and the cross-section area of the variable cross-section groove is gradually increased from the bow to the stern. The invention further discloses an assembly method of the batten type water lubricated bearing. The first batten is arranged in the bearing carrying area and provided with the variable cross-section groove, so that the rigidity of the first batten is gradually reduced in the direction from the bow to the stern, axial gradient rigidity distribution is formed, the low-rigidity area at the stern end can adapt to deformation of the stern shaft to be adjusted in a self-adaptive mode, local stress concentration is reduced, and the stability of the stern end is improved. And a high-rigidity area at the bow end maintains necessary bearing strength, so that the axial load of the bearing is homogenized as a whole.

The invention discloses a multipoint non-uniform measurement device for uniaxial compression radial displacement of salt rock at high temperature and an implementation method. The measurement device comprises an axial load loading system, a test cavity temperature control system, a radial displacement measurement system and a computer data processing system, the test cavity temperature control system is used for regulating and controlling the environment temperature of the salt rock sample placed in the test cavity temperature control system, so that the salt rock sample is located in a high-temperature environment with a preset temperature; the axial load loading system is in contact with the salt rock sample in the test cavity temperature control system and is used for applying a vertically downward axial load to the salt rock sample at a high temperature; and the radial displacement measurement system is connected with the salt rock sample and is used for measuring the real-time temperature and radial displacement of the surface of the salt rock sample placed in the test cavity temperature control system. And the computer data processing system is connected with the radial displacement measuring system. According to the invention, the radial displacement and temperature of the salt rock sample in the uniaxial compression process can be measured with high precision under the high-temperature condition.

The invention discloses a true triaxial dynamic and static combined loading and multi-field coupling test device and method. The test device comprises a test cavity; the loading system comprises an axial loading device, a Hopkinson pressure bar, a longitudinal loading device and a vertical loading device; the axial loading device is configured to apply an axial load to the test coal sample; the Hopkinson pressure bar is configured to apply an impact load to the test coal sample; the longitudinal loading device is configured to apply a longitudinal load to the test coal sample; the vertical loading device is configured to apply a vertical load to the test coal sample; the gas supply system comprises a gas bottle and is configured to inject gas into the test cavity; the fiber bragg grating monitoring system comprises a fiber bragg grating sensor and a fiber bragg grating demodulator, and the fiber bragg grating demodulator is configured to be used for sensing a change signal of a strain field of the test coal sample under the loading action of the loading system; and the ultrasonic phased array monitoring system comprises an ultrasonic transducer and is used for sensing an ultrasonic signal of the test coal sample under the loading action of the loading system.

The invention discloses a variable-shaft-diameter rolling bearing testing device and testing method, and aims to solve the problems that an existing rolling bearing testing device is difficult to adapt to bearings with different shaft diameter specifications, and a main shaft needs to be replaced frequently. The device is composed of a testing platform, a lead screw driving mechanism, an axial loading mechanism, an inner diameter variable mechanism, an outer diameter variable mechanism, a main shaft, a bearing seat mechanism, a main shaft coupler, a main shaft motor and a supporting frame. The inner diameter variable mechanism adapts to the inner diameters of different rolling bearings through a plurality of ring petals and a chuck structure, the outer diameter variable mechanism can adjust the outer diameter and the radial applied force in real time according to the outer diameter of the rolling bearing, the axial loading mechanism can apply a preset axial load to the bearing, and besides conventional constant axial force, the axial loading mechanism can also apply axial torque in different directions. The device can adapt to the testing of rolling bearings with various shaft diameter specifications without replacing the whole set of main shaft, effectively shortens the testing preparation time, and improves the testing efficiency. And the universality and the applicability are high.

The invention relates to the technical field of bearing tests, in particular to a loading device and a loading method for a low-temperature bearing test of a spaceflight turbine pump. Comprising a test shaft shell, a test bearing A, an axial loading gland, an axial loading piston cylinder shell, an axial loading piston, a variable-diameter piston cylinder shell, a variable-diameter piston cylinder piston, a vaporizer, a test bearing B, a liquid nitrogen pipeline, a nitrogen pipeline and a hydraulic oil pipeline. Liquid nitrogen enters a test shaft shell from a liquid nitrogen pipeline to be fully cooled and then is discharged, the liquid nitrogen is converted into nitrogen through heat exchange of a vaporizer, the nitrogen is introduced into a variable-diameter piston cylinder shell through a nitrogen pipeline to push a variable-diameter piston cylinder piston to compress hydraulic oil, and the hydraulic oil is introduced into an axial loading piston cylinder shell to generate oil pressure to push an axial loading piston to move. The axial loading piston generates thrust on the axial loading gland to promote the axial loading gland to complete thrust loading on the test bearing, the electric cylinder is adopted to directly apply push-pull force load to the variable-diameter piston rod, load fluctuation is compensated, and stability of the test load is guaranteed.

The invention provides an axial force active balancing method for a fluid machine. The axial force active balancing method for the fluid machine comprises the steps that S1, fluid axial force borne by an impeller of the fluid machine during working is obtained; s2, configuring a motor for driving the impeller, and enabling the motor to generate an electromagnetic axial force through design or control; and S3, the direction of the electromagnetic axial force is opposite to that of the fluid axial force, the magnitude of the electromagnetic axial force is controlled to at least partially counteract the fluid axial force, and therefore the net axial load transmitted to the supporting bearing is reduced. The driving motor is actively designed and controlled to generate electromagnetic axial force which is equal to the pneumatic / hydraulic axial force of the impeller in magnitude and opposite to the pneumatic / hydraulic axial force of the impeller in direction, so that zero returning or minimization of net axial force is realized at the bearing.

The invention discloses a ball screw pair loading test device, and relates to the technical field of ball screw testing. The driving piece is used for driving the tested lead screw to rotate and adopts an integrated headstock structure integrated at one end of the bed body; and the loading piece is used for providing an axial load for the tested lead screw, adopts a dual-motor top-to-top loading structure arranged at the other end of the bed body, and is matched with the integrated headstock structure to form a unified mechanical standard. According to the invention, an integrated headstock structure of the driving piece and a dual-motor opposite-top loading structure of the loading piece are matched to form a unified mechanical standard, a friction torque measurement state and an axial force measurement state are rapidly switched through a switchable connection structure, a to-be-tested lead screw only needs to be clamped once, multi-parameter test can be completed, the test efficiency is effectively improved, and the test cost is reduced. And meanwhile, positioning errors caused by multiple times of clamping are avoided, it is ensured that all parameters are based on the same reference, and data relevance is higher.

The invention discloses a porous medium static pressure air floatation spline which comprises a spline shaft, a spline sleeve outer sleeve, an air bearing, a spline sleeve, a flange sleeve, a valve plate and a porous medium. The air floating spline is cylindrical, a plurality of air paths and static pressure cavities are formed in the air floating spline, porous media are mounted in trapezoidal grooves of the spline housing, and the internal static pressure cavities enable circumferential torsional moment applied to the spline shaft to be borne by the porous media and static pressure supports between trapezoidal tooth slopes on the spline shaft when the spline works; radial force applied to the spline shaft is borne by a static pressure support between the porous medium and the inclined plane of the trapezoidal teeth and a static pressure support on the inner ring of the air bearing; the axial load applied to the outer sleeve of the spline housing is borne by the annular static pressure cavity and the annular static pressure cavity; according to the porous medium static pressure air floatation spline, abrasion of the spline in the working process is reduced, and the problem that the spline precision is affected due to abrasion after a traditional ball spline works for a period of time is solved.

The invention relates to a wind power tower bending shear torsion test loading anti-interference decoupling switching integrated device, which comprises a reaction wall, a support, a reaction column, a reaction longitudinal beam, a reaction cross beam and four actuators, and is characterized in that the top end of a fixed tower on the support is connected with a loading beam through a switching device; the first actuator applies axial load to the tower drum through the loading beam and the switching device, the second actuator and the third actuator apply bending moment to the end of the tower drum through the loading beam and the switching device, the fourth actuator is matched with the connecting piece, the rectangular steel plate is connected with the switching device to apply horizontal shearing force and torque to the end of the tower drum, and application and decoupling of various types of loads are achieved. The test precision is ensured; the device can truly simulate the load condition of the tower drum section, can also be matched with the loading beam to transmit the axial force, the bending moment, the shearing force and the torque to the wind power tower drum, and effectively solves the influence of horizontal displacement and torsional deformation on loading in the horizontal and vertical load coupling loading process in the wind power tower drum composite load simulation test.

The spindle sliding bearing comprises a radial pad, a thrust pad and a bearing main body, the middle of the bearing main body is columnar, and the two sides of the bearing main body are conical tables; the radial pads are uniformly arranged in the middle of the through hole in the bearing main body in the circumferential direction, and the thrust pads are uniformly arranged on the conical tables at the two ends of the bearing main body in the circumferential direction. Compared with the prior art, the segmented sliding bearing is adopted, the conical surface radial pads and the inclined plane thrust pads are distributed in an array mode in the axial direction to form a multi-pad structure, and the pad replacement efficiency can be improved. The thrust pad installed in an inclined mode can bear radial loads and axial loads at the same time, and the overall bearing capacity of the bearing is enhanced while axial impact is borne.

The utility model discloses a gearbox axial force loading test device, which comprises a test shaft, an upper mounting structure, a lower mounting structure and an axial force applying mechanism, the upper mounting structure comprises a bearing seat, an upper radial bearing, a thrust bearing and a lower radial bearing, and the test shaft is rotatably connected with the bearing seat through the upper radial bearing, the thrust bearing and the lower radial bearing. Labyrinth oil seals are arranged at the upper part and the lower part of the bearing seat; the axial force applying mechanism comprises an oil cylinder, and a piston rod of the oil cylinder is connected with the bearing seat. According to the utility model, the test shaft is a large-span shaft, the actual connection condition of the gear box rotating shaft in actual work is fully simulated, so that the test is closer to the actual operation condition of the gear box rotating shaft, the actual performance parameters under the actual working condition are further obtained, and the reliability of the parameters is ensured; the two radial bearings are used for radially positioning and supporting the test shaft, the concentricity of the test shaft and the rotating shaft is ensured, the thrust bearing is used for bearing the axial load, and the service life of the device is ensured.

The invention discloses an elevator bearing multifunctional test tool, which comprises a frame body, a mandrel, a tool seat, a support plate and a drive plate, a through hole penetrates through the tool seat, and a to-be-tested bearing is connected between the mandrel and the through hole. The driving plate is provided with a driving structure which is used for driving the mandrel to operate to enable the to-be-tested bearing to operate synchronously so as to simulate the actual operation condition of the elevator bearing, and the frame body is provided with a first simulation structure which is used for applying a static or dynamic radial load to the inner ring of the to-be-tested bearing so as to simulate the actual static or dynamic radial load condition of the bearing. The frame body is also provided with a second simulation structure used for applying a static radial load to the outer ring of the to-be-tested bearing and a third simulation structure used for applying a static axial load or a reciprocating axial load to the inner ring of the to-be-tested bearing so as to simulate the working condition that the bearing is actually subjected to the static axial load or the reciprocating axial load. The problems that a traditional elevator bearing test tool is single in detection function and different load working conditions borne by an elevator bearing in actual operation are difficult to simulate are solved.

An asymmetric self-aligning roller bearing for a fan and its design method. The asymmetric self-aligning roller bearing is composed of an outer ring, an inner ring, a row of spherical rollers A, a row of spherical rollers B, and a cage. The bearing has different contact angles. The outer ring raceway is a spherical arc with a continuous radius value R, and the center of the sphere O is at the demarcation point of the widths B1 and B2 on the bearing center line. The long spherical rollers and the short spherical rollers have the same maximum diameter and spherical radius value, but different lengths. At the same time, this solution also discloses the design method of the bearing of the present invention. The bearing with different contact angles described in the present invention is applicable to the working conditions of a wind power main shaft, has a large axial load-bearing capacity, and the same diameter and spherical radius value of the double-row rollers make the manufacturing cost lower.

The invention relates to the technical field of aero-engine speed reducer and transmission system tests, and discloses a transmission shaft loading device which comprises a force transmission assembly connected with the front end of a transmission shaft, and the front end of the transmission shaft is suitable for serving as a power input end; the radial loading assembly applies a radial load Fr in the z-axis direction to the transmission shaft through the force transmission assembly. The axial loading assembly applies an axial load Fx in the x-axis direction to the transmission shaft through the force transmission assembly; the radial loading assembly and the axial loading assembly apply a bending moment load My around the y-axis direction to the transmission shaft through the force transmission assembly. According to the technical scheme, the radial load, the axial load and the bending moment load borne by the transmission shaft can be effectively simulated. According to the transmission shaft loading device, the load states of a turboprop engine speed reducer and a tilting main speed reducer of a tilting rotorcraft transmission system in a horizontal working condition in actual work can be truly simulated, and when the speed reducer is subjected to a simulation operation test, the real performance of the speed reducer is obtained.

The invention discloses a mechanical metamaterial cell element with a zero Poisson's ratio property, and belongs to the technical field of mechanical metamaterials. The upper top plate and the lower bottom plate are symmetrically arranged, the upper cleat nail set and the lower cleat nail set are arranged at the four corners of the inner side faces of the upper top plate and the lower bottom plate, the elastic body set is connected through the upper cleat nail set and the lower cleat nail set, and the flexible hinge component set is arranged at the midpoint position of four side lines of the upper top plate and the lower bottom plate. The flexible hinge component set keeps inward pre-bending through the pre-tension of the elastomer set, and when the cell element bears an axial load, the flexible hinge component set generates coordinated inward bending deformation, so that the cell element shrinks in the axial direction, the transverse size is kept stable, the axial zero Poisson's ratio characteristic is achieved, and meanwhile the energy absorption capacity is achieved. The cell element is based on elastic deformation, has self-recovery capability and long cycle life, adopts modular design, is convenient to assemble, disassemble and maintain, and is suitable for application scenes of aerospace buffer devices, biomedical implants, precise instrument supporting structures and the like.

The invention discloses a wall type Z-shaped metal torsion tube damper anti-seismic system and method. The wall type Z-shaped metal torsion tube damper anti-seismic system comprises a frame beam, a frame column, a cantilever wall and a Z-shaped metal torsion tube damper. The frame beams and the frame columns are connected with a building, the cantilever walls are connected with the frame beams, and the Z-shaped metal torsion tube dampers are arranged between the paired cantilever walls and connected with the cantilever walls so as to dissipate energy transmitted by the cantilever walls. According to the damper anti-seismic system, the Z-shaped metal torsion tube damper is arranged to replace a traditional mild steel metal damper and a viscous damper to conduct damping design of a building structure, the problem that the low-cycle fatigue performance of the traditional metal damper is poor is solved, the oil leakage risk of the viscous damper is avoided, and the anti-seismic performance of the building structure is improved. Moreover, due to the structural design in the damper, the influence of the bending and shearing effect on the deformation of the torsion tube under the action of an axial load is eliminated, so that the section of the torsion tube is always kept a stable circular section in the hysteresis energy consumption period of the torsion tube, and the energy consumption efficiency is ensured.

The invention belongs to the technical field of aviation high-speed transmission, and provides an inner ring multi-step bevel gear radial plate, a radial plate part, a connecting disc part and a central shaft part are sequentially and coaxially connected and are arranged up and down, through holes are formed in the radial plate part, the connecting disc part and the central shaft part to form vertical flow channels, and the radius of the side wall of an inner ring of the radial plate part is larger than that of the side wall of an inner ring of the connecting disc part. The radius of the inner ring side wall of the connecting disc part is larger than that of the inner ring side wall of the center shaft part, a triangular ring cavity is formed in the radial plate part, and an annular groove is formed in the upper end face of the radial plate part. According to the inner ring multi-stage stepped bevel gear wheel disk, the vertical flow channels form a multi-stage stepped structure, and then the resistance of the gear wheel disk to axial loads is improved; and the high pitch diameter resonance frequency and the low pitch diameter resonance frequency are separated while the low pitch diameter resonance frequency is basically unchanged, so that the pitch diameter resonance problem of equipment within the working rotating speed range is avoided, and the overall weight of the bevel gear wheel disk is reduced through the triangular ring cavity.

The utility model discloses a bearing axial load monitoring device, and relates to the technical field of bearing monitoring devices. The bearing axial load monitoring device comprises a bearing bracket, a monitoring rod, a fixed frame, a movable rod, a pressure sensor main body and a controller, the bearing bracket is arranged at a target supporting position and is provided with a main shaft for supporting the bearing main body; the monitoring rod is connected to the bearing support in a sliding mode and is aligned with the side face of the bearing body. The bearing axial load monitoring device utilizes the design of the bearing bracket, the monitoring rod, the fixed frame, the movable rod, the pressure sensor main body and the controller, is simple and reliable in overall structure, stable in operation, convenient to install and cost-saving, adopts a mode of directly monitoring the side surface of the bearing main body, improves the monitoring precision, ensures the monitoring accuracy and stability, and is suitable for popularization and application. And important data support is provided for operation and maintenance of equipment.

A ball screw bearing oil lubrication durability test device disclosed by the present invention comprises a tool table and two tool sleeves oppositely arranged on the tool table, the tool sleeves are provided with oil cavities, the oil cavities are filled with lubricating grease, and a ball screw bearing to be tested is movably arranged in the oil cavities. The tool table is provided with a driving part used for driving a screw part of the ball screw bearing to be tested to rotate and a loading part used for applying an axial load to a nut part of the ball screw bearing to be tested. The tool sleeve is provided with a sealing structure which is used for being in linkage cooperation with the driving piece and the loading piece so as to achieve dynamic sealing of the oil cavity when the ball screw bearing to be tested operates. The problem that a traditional ball screw bearing test tool is difficult to test the bearing on the premise of simulating the actual operation condition, the actual oil bath lubrication environment condition and the loading condition of the bearing, and consequently the test precision and the test efficiency are low is solved.

The invention relates to the technical field of bolt connection fatigue life prediction, in particular to a high-strength bolt connection fatigue life prediction method and system, and the method comprises the steps: obtaining a bolt entity morphology discrete point cloud, and generating a continuous geometric topology function through non-uniform rational B-spline interpolation reconstruction; discretizing the standard thread parameters to construct a standard finite element model, calculating a normal spatial position difference value based on a continuous geometric topology function, and packaging to generate a geometric defect mapping tensor; according to the converted node coordinates, constructing a real morphology finite element model; solving the nonlinear equilibrium equation by utilizing a penalty function method, and generating a contact stiffness characteristic matrix; calculating an axial load distribution sequence and executing gradient convolution operation, and extracting a local field variable peak value; and calculating an accumulated damage index in combination with a damage evolution equation and outputting a predicted life. By mapping the entity discrete point cloud into a finite element geometric defect tensor and reconstructing a real morphology model, the accurate prediction of the fatigue life of the bolt considering the micromachining deviation influence is realized.

The utility model discloses a split bearing for improving the axial loading capacity of a self-aligning roller bearing, and belongs to the technical field of bearings. A split bearing for improving the axial loading capacity of a self-aligning roller bearing comprises a bearing outer ring and a bearing inner ring, the bearing outer ring comprises a left half outer ring and a right half outer ring, the bearing inner ring comprises two half inner rings, the two connecting ends of the left half outer ring and the right half outer ring are connected through two first hexagon socket screws respectively, and the two connecting ends of the left half outer ring and the right half outer ring are connected through two second hexagon socket screws respectively. The butt joint surfaces of the two half-and-half inner rings are in threaded connection through two positive and negative double-end studs respectively; compared with a traditional split type bearing, the split type bearing has the advantages that the structure is simple, fastening can be completed only through screws and bolts, meanwhile, the split type bearing is more suitable for being used in a high-altitude tower seat cabin, a wind power main shaft set with limited space and other working conditions, and the split type bearing has the advantages of being easy to install and replace and low in manufacturing cost.

The utility model discloses an angular contact bearing stamping retainer, and belongs to the field of bearing stamping retainers, the angular contact bearing stamping retainer comprises a lower frame, the lower frame comprises a mounting device, the mounting device comprises a bearing, the bottom of the lower frame is rotatably connected with the bottom of a lead screw through the bearing, and the bearing is a ball bearing and can bear radial, axial and composite loads at the same time. The ball bearing is matched with the shaft in an interference fit or clearance fit mode. The steel balls are placed between the lower frame and the upper frame, the first conical block and the second conical block are plastic parts and have toughness, the stability of the upper frame and the lower frame can be well improved, the convenience and efficiency of steel ball installation are obviously improved, the problem of customization of the retainer due to the steel balls of different sizes is solved, and the service life of the retainer is prolonged. The operation is simpler, more convenient and more flexible, so that the problem that steel balls with different sizes in the background technology need to be customized for a retainer and are very inconvenient to use is solved.