498 results about "Axial load" patented technology

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 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.

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 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 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 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 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.

A bearing axial loading test device comprises a driving motor, an accompanying test bearing seat, an auxiliary bearing seat and an axial loading mechanism which are sequentially arranged from left to right. According to the utility model, the steps of the stepped shaft are adopted to position and place the bearing to be tested, the position precision and the dismounting efficiency of the bearing to be tested are improved, and the steps with different diameters are utilized to place the bearings to be tested with different models, so that the test range of the bearing axial loading test device is expanded; the one-way stepped shaft and the two-way stepped shaft form a clamped beam structure by using the accompanying test bearing seat and the auxiliary bearing seat, so that the stability of the stepped shafts under high-speed rotation is improved, the influence of high-speed rotation on the axial load of the to-be-tested bearing is avoided, and the test precision is improved; the separable roller bearing is adopted to reduce the resistance of the stepped shaft during axial movement, the placement cavity is defined by the accompanying test shaft and the auxiliary bearing to store lubricating oil, the lubricating oil is utilized to reduce the resistance of the bearing during relative movement of the inner ring and the outer ring, and the precision of the axial load output to the bearing to be tested is improved.

The invention relates to the technical field of connecting part load distribution and life analysis, in particular to a method for evaluating axial load distribution and wear life of a connecting part, which comprises the following steps of: generating a three-dimensional geometric model by inputting key structure parameters of a spline coupling so as to identify a tooth surface contact area, a transition area and a non-key area; the method comprises the following steps of: constructing a combination assembly model through rigid body transformation, identifying a physical contact area to generate a node pair set, and identifying a potential stress concentration and contact instability area after applying a load working condition in the assembly model. The method comprises the following steps of: selecting a local mesh as a candidate region of local mesh refinement, integrating to generate a complete finite element input file, calculating the wear depth of a contact node based on a wear model, and determining whether to terminate simulation, so that the whole process automation of the connecting part from modeling, assembling to wear prediction is realized, and the analysis efficiency and the result accuracy are remarkably improved.

The invention discloses a method, system and device for testing the transmission efficiency of a nut main transmission lead screw pair with vertical loading, and the method comprises the steps: installing the nut main transmission lead screw pair on a vertical power transmission path, fixing a lead screw, and enabling a nut to carry out the axial movement while achieving the rotation movement; a displaceable torque conduction module is additionally arranged between the output end of the motor and the nut, so that torque is continuously input in real time while the nut moves axially; a loading module is arranged to apply a dynamic or static load to the nut so as to simulate actual loads under different working conditions; the input torque, the nut rotating speed, the axial load and the displacement of the nut main transmission lead screw pair are detected in real time; based on real-time detection data, the transmission efficiency eta is calculated, and a real-time efficiency curve is generated. Based on a vertical structure, a test scheme of complete fixation of the lead screw and composite motion of rotation and axial movement of the nut is innovatively adopted, the problem of motion limitation of a long nut structure in a nut main transmission lead screw pair is effectively solved, and meanwhile, the influence of additional bending moment generated by a cantilever structure on the measurement precision in a traditional test is eliminated; and the accuracy and reliability of the transmission efficiency test of the nut main transmission lead screw pair are obviously improved.

The invention provides an aero-engine main bearing axial displacement measuring device and method, and belongs to the technical field of aero-engines, the aero-engine main bearing axial displacement measuring device comprises a bottom plate, a supporting seat, a dial indicator measuring tool, a bearing initial displacement measuring assembly and an axial loading displacement measuring assembly, the supporting seat comprises a first part and a second part, the first part is vertically connected with the bottom plate, and the second part is vertically connected with the dial indicator measuring tool; the main bearing is sleeved on the second part, the periphery of the second part is provided with a guide surface matched with the inner ring of the main bearing, the joint of the first part and the second part is provided with a step surface, the step surface forms a limiting end surface of the inner ring end surface of the main bearing with a dismounting groove, and the dial indicator measuring head abuts against the outer ring of the main bearing; when the free-state displacement activity amount is measured, the bearing initial displacement measurement assembly is fixed on the main bearing and the supporting seat; when the axial loading displacement is measured, the axial loading displacement measuring assembly is fixed on the supporting seat, and axial force is applied to the outer ring of the main bearing. According to the invention, effectiveness and high precision of bearing displacement measurement are realized and improved.

The embodiment of the utility model discloses a multi-row angular contact thrust ball bearing, which comprises an inner ring, an outer ring and a rolling body arranged between the inner ring and the outer ring, the outer surface of the inner ring is provided with a plurality of rows of raceways, and the diameters of the plurality of rows of raceways are gradually reduced from left to right; the inner surface of the outer ring is provided with a plurality of rows of raceways in one-to-one correspondence with the raceways on the outer surface of the inner ring, and the diameters of the plurality of rows of raceways are also gradually reduced from left to right; and the rolling bodies are arranged in each row of raceways between the inner ring and the outer ring. According to the multi-row angular contact thrust ball bearing disclosed by the embodiment of the utility model, the axial load is greatly improved while the radial load is ensured, and the multi-row angular contact thrust ball bearing can be used in occasions with special requirements on the axial load, the radial load and the axial and radial combined load.

The invention provides a method for establishing a nonlinear constitutive model of low-temperature marine steel, and relates to the technical field of ships and materials. A heterogeneous time series data set is provided for model construction through multi-type sample multi-axial load tests and full-field strain acquisition; nonlinear mapping of deformation activation energy about temperature and microscopic state variables is established by taking a crystal plasticity theory as a framework, and the defect that a low-temperature dislocation evolution rule cannot be reflected due to the fact that a traditional model solidifies physical parameters into constants is overcome; a damage evolution operator jointly induced by stress triaxial degree and a principal stress threshold is embedded, Bayesian inference is adopted to carry out parameter joint calibration, model dynamic calibration and parameter continuous optimization are realized through a simulation and experiment closed-loop iteration mechanism, and finally a digital design evaluation model capable of being under untested extreme working conditions is produced. And an engineering tool taking physical interpretability and probabilistic safety margin into consideration is provided for the ice-resistant design of the polar region ship.

The invention relates to the technical field of harmonic reducer wave generators, and discloses a harmonic reducer wave generator capable of bearing axial load, which comprises a rigid gear, a flexible gear and a wave generator, the wave generator is arranged in the flexible gear, the flexible gear is arranged in the rigid gear, the inner ring of the rigid gear is meshed with the outer ring of the flexible gear through teeth, and the inner ring of the rigid gear is meshed with the outer ring of the flexible gear. The long shaft part of the flexible gear is in contact with the rigid gear, the short shaft part of the flexible gear does not participate in action, the wave generator comprises an oval cam and a flexible bearing, and the oval cam is arranged in the flexible bearing; the flexible bearing comprises a bearing inner ring, a bearing outer ring and balls, the bearing inner ring and the bearing outer ring are each provided with two channels, the distance between the two channels of the inner ring is smaller than that between the two channels of the outer ring, and when the multiple balls are arranged in the corresponding channels in the bearing inner ring and the bearing outer ring, the contact points of the balls and the outer ring and the contact points of the balls and the inner ring are connected through the connecting line of the centers of the balls. And a certain included angle is formed between the bearing and the radial direction of the bearing and is generally about 15 degrees. The flexible bearing can bear a certain axial load, the bearing capacity of the speed reducer can be greatly improved, the precision service life of the speed reducer can be greatly prolonged, the application field and range of the speed reducer are expanded, and the flexible bearing is simple in structure and convenient to install.

The utility model provides a coke pot trolley walking mechanism suitable for a curve. The coke pot trolley walking mechanism comprises a frame; a plurality of wheels are arranged at the bottom of the frame, and inclined areas and connecting areas are sequentially arranged at the ends, making contact with the rails, of hubs of the wheels; the center plate structure is arranged on the frame, the center plate structure comprises an upper center plate and a lower center plate, and an adjusting structure is arranged between the upper center plate and the lower center plate and used for generating rolling friction between the upper center plate and the lower center plate. The inclined areas are arranged on the wheels to effectively cope with lateral force brought by a curve, the adjusting structure in the center plate structure can bear very large axial load and radial load, and the adjusting structure and the center plate structure work cooperatively, so that the coke tank trolley can safely and stably pass through the curve, the risk of overturning of the trolley and a coke tank is greatly reduced, and the service life of the coke tank trolley is prolonged. And the transportation requirement under a complex reshipment route is met, the production efficiency is improved, and the production safety is guaranteed.

The utility model relates to the technical field of bushings, in particular to a high-stability rear trailing arm bushing with an integrated structure, which comprises an outer sleeve, an inner core, a spring and a rubber body formed between the outer sleeve and the inner core, the inner core is located on the inner side of the outer sleeve. The spring is sleeved in the middle of the inner core and is immersed in the rubber body, so that not only can a larger lateral load and a larger torsion angle be borne, but also a stronger axial load can be still achieved under the condition that the rubber body is aged, and the capacity of absorbing vibration energy and the comfort of an automobile in the running process are ensured.

The stand column comprises a stand column body with a built-in motor and a push rod assembly, a lead screw of the push rod assembly is rotationally connected with the motor, and the motor drives the push rod assembly to stretch out and draw back so as to drive the stand column body to stretch out and draw back; a friction piece synchronously rotating with the lead screw and a floating piece which is arranged in a floating mode and abuts against the friction piece are arranged on the lead screw, the floating piece achieves one-way braking on the friction piece through a brake control piece, the stand column body and the lead screw jointly apply pressure for enabling the friction piece and the floating piece to be close to each other, and the pressure responds to the axial load; when the stand column body tends to be shortened, the braking control piece tightly holds the floating piece, and the floating piece provides braking force for the friction piece. The lifting table comprises a table board and a lifting stand column. The height of the table board responds to stretching of the lifting stand column. The braking force responds to the axial load, height locking under different loads is achieved, energy consumption is reduced to the maximum degree, and meanwhile noise generated by forced rotation cannot be generated.

The present application relates to the technical field of wind turbine bearing, in particular to a method and device for adjusting axial force balance of double-row self-aligning roller bearing, the device comprises an axial force applying assembly arranged outside the bearing seat, the axial force applying assembly is composed of a ring-shaped positioning element and a plurality of groups of elastic elements arranged uniformly along the circumference in the cavity of the positioning element, the inner ring of the positioning element extends radially inward and projects to cover the outer ring of the bearing, one end of the elastic element faces the inner part of the cavity, and the other end contacts the outer ring of the bearing through a pressure equalizing ring. The present application generates a reverse additional support force under the action of axial load, actively transfers part of the load from the stressed side bearing row to the non-stressed side, solves the problem that the roller contact stress of the stressed side of the existing double-row self-aligning roller bearing is too high under the single-sided axial load working condition, and early fatigue spalling is easily caused, realizes the balanced distribution of axial force, effectively reduces the peak contact stress, and significantly prolongs the service life of the bearing.

The application relates to the technical field of bearing testing, in particular to a space turbine pump low-temperature bearing test loading device and a loading method, which comprises 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 the test shaft shell, is fully cooled and is discharged, is converted into nitrogen gas through heat exchange of the vaporizer, is introduced into the variable-diameter piston cylinder shell through the nitrogen pipeline, generates compression on the hydraulic oil, the hydraulic oil is introduced into the inside of the axial loading piston cylinder shell to generate oil pressure and push the axial loading piston to move, the axial loading piston generates thrust on the axial loading gland, the axial loading gland completes thrust loading on the test bearing, an electric cylinder is directly used to apply push-pull force load on the variable-diameter piston rod, load fluctuation is compensated, and the test load is stable.

A deflectable tube (312) has a deflectable tip section (301) and a bendable body section (309). The deflectable tube has one or more turning wires (16 (i)) that rotate helically in the body section (309) in order to compensate for path length differences occurring in the body section (309) when the body section (309) is bent. In order to isolate axial loads in the body section (309), the deflectable tube (312) is provided with one or more longitudinal force isolation elements (322 (k)) in the body section (309), the one or more longitudinal force isolation elements extending parallel to the one or more steering wires (16 (i)). Both ends of the force isolation element (322 (k)) are attached to the outer tube (340) or the inner tube (330) or both.

The invention relates to the technical field of bearing test devices, in particular to a bearing precision life test device and method, and the device comprises a housing, one side of the housing is rotatably provided with a driving shaft, the driving shaft penetrates through the housing and is in transmission connection with a mandrel, one side of the mandrel is fixedly connected with a sleeve, and the inner side of the sleeve is in sliding clamping connection with a bearing to be tested. A bearing clamping mechanism is movably installed between the fixed spring seat and the sleeve, a pressure frame is movably installed on the outer side of the stress bearing cover, a transition frame is fixedly installed on the outer side of the pressure frame, and an axial loading mechanism is fixedly installed between the transition frame and the stress bearing cover. Precision monitoring mechanisms are fixedly installed on the opposite outer sides of the pressure frames. According to the scheme, core data such as radial run-out, axial load and temperature are collected in real time through multi-dimensional monitoring assemblies such as a non-contact eddy current displacement sensor and a pressure sensor, and the precision decline amount can be accurately quantified by combining radial run-out index comparison before and after the test.

The utility model discloses a spiral compression spring which comprises supporting rings at the two ends and a spring body located between the two supporting rings, the spring body and the supporting rings are sequentially and spirally wound in a directional mode to form a cylindrical shape, and the two end rings of the spiral compression spring are tightly combined and ground to be flat or are tightly combined and ground to be flat after being flattened. A gap is formed between every two rings of the spring body, and a contact line compensation ring is additionally arranged on the supporting ring; the contact line compensation ring and the supporting ring are integrally formed, and the contact line compensation ring extends by a certain length from the contact point of the supporting ring and the spring body to the tail tip direction along the spiral line of the supporting ring. According to the utility model, the contact line of the cylindrical helical compression spring can be independently compensated, the length of the contact line meeting the standard requirement can be obtained without loading or loading a very small axial load, the properties such as the total number of turns, the number of effective turns, the free height, the compression height and the reserved safety stroke are not changed, the stability and the bearing capacity are improved, and the production cost is reduced. The service life is prolonged.

This invention relates to the technical field of boring machines and discloses a boring machine column device with a U-shaped guide rail layout. The device includes a machine bed with a worktable. A U-shaped column is fixedly installed on the right side of the machine bed. A U-shaped guide rail is fixedly installed on the inner wall of the U-shaped column. Two guide rail assemblies a are provided on the U-shaped guide rail. Two crossbars are fixedly installed on the two guide rail assemblies a. Connecting blocks are provided on the two crossbars. A spindle box is fixedly installed below the connecting blocks. Two vertical blocks are fixedly installed on each of the two guide rail assemblies a. Lead screws are threaded through each of the two vertical blocks. A housing is fixedly installed on the upper side of the U-shaped column. The housing is connected to the two lead screws. A rotary starter inside the housing can drive the lead screws to rotate back and forth. The U-shaped guide rail layout enhances the moment of inertia of the U-shaped column section, effectively resisting deformation caused by cutting forces and vibrations. The U-shaped layout can simultaneously withstand radial cutting forces, axial loads, and overturning moments. Multi-point support disperses stress and reduces the risk of local deformation.

The application belongs to the field of composite structure layer design of aircraft structure, and particularly relates to a composite laminate layer proportion optimization method, step S1: in the aircraft design process, the design load and the aircraft structure layout are determined, the design allowable value of the composite material applied to the aircraft is determined, including the axial allowable strain epsilon ad , the shear allowable strain gamma ad ; step S2: based on the external load of the aircraft structure and the specific layout, the load characteristic value T of the aircraft to be layered structure is calculated, and the load characteristic value T represents the trend characteristics of the axial load and the shear load of the aircraft to be layered structure; step S3: a plurality of preset proportion composite laminates in a layering library are obtained, and the material characteristic value T m of the composite laminates is calculated; step S4: based on the structure load characteristic value T, the composite laminate with the material characteristic value T m matching the load characteristic value T is selected. The relationship between the structure and the material is quantified, so that the structure material selection is more intuitive and optimal.