2276 results about "Slider bearing" patented technology

The invention relates to the field of mechanical equipment health management, in particular to a large sliding bearing fault detection and evaluation method, device and system. Comprising the following steps: collecting multi-source sensing data, and constructing a comprehensive data set; constructing a state space model based on a sliding bearing physical mechanism; the multi-source sensing data and the state space model are fused through Bayesian filtering, and hidden state parameter posterior distribution is dynamically estimated; generating a virtual fault sample by using a generative adversarial network in combination with a physical rule base; designing a Bayesian space-time sequence diagnosis model based on an attention mechanism, and generating fusion health state features; processing and fusing the health state features by using a degradation process model, and predicting the remaining service life of the bearing; and based on the health state, the fault probability and the remaining service life, setting multi-stage early warning threshold values, and triggering intelligent early warning. According to the method, the defect that a single model is insufficient in adaptability and generalization ability under complex working conditions is overcome, and the accuracy and reliability of fault detection are remarkably improved.

The invention discloses a sliding bearing friction wear prediction method based on fluid mechanics, and relates to the technical field of mechanical state monitoring, and the method comprises the steps: collecting single-point temperature, local pressure, vibration time domain signals and a bearing pedestal inclination angle through a sensor, and generating sensor data; performing field reconstruction based on a fluid mechanics conservation equation on the sensor data to obtain multi-field data; performing spatial alignment on the multi-field data, inputting the multi-field data into a long short-term memory (LSTM) network, and generating wear state characteristics; training a sparse correlation vector machine regression model RVM by using the historical wear data, establishing a nonlinear mapping relationship between the wear state characteristics and the wear depth, taking the wear state characteristics as the input of the vector machine regression model RVM, and outputting the predicted wear depth; sensor data and the predicted wear depth are fused in real time through Kalman filtering, and when prediction deviation exceeds a covariance threshold value, vector machine regression model RVM parameters are updated.

The invention relates to the technical field of metal sliding bearings, and provides a liquid metal sliding bearing with high sealing performance, which comprises a mandrel, a graphite sealing assembly, a flange and a shaft sleeve, and further comprises a ternary gallium-based liquid metal and a silicon carbide ceramic coating, wave-shaped check rings are arranged among the multiple graphite rings at intervals, initial contact loads are provided through the wave-shaped check rings, the graphite rings and the flange are tightly attached, static sealing with excellent performance is formed in the static state, and the fit clearance between the mandrel and the shaft sleeve is filled with ternary gallium-based liquid metal. A silicon carbide ceramic coating is plated at the matching position of the mandrel and the flange, and a silicon carbide ceramic coating is also plated at the matching position of the mandrel and the shaft sleeve. By using the graphite ring, the ternary gallium-based liquid metal and the silicon carbide ceramic coating, the liquid metal has good fluidity, so that the interface can be fully filled, the liquid metal is not easy to volatilize, the lubricating effect is better, the friction factor is low, and the wear resistance is better.

The invention relates to the technical field of metal bearings, in particular to a reinforced liquid metal sliding bearing. The enhanced liquid metal sliding bearing comprises a rotor, a stator and liquid metal filled in an assembling gap between the rotor and the stator. The fixed positions of the rotor and the stator are provided with a spiral groove structure, a textured microstructure, an infiltration coating and a sealing coating. By adopting the enhanced liquid metal sliding bearing provided by the invention, the wettability and the wear resistance of a bearing rotating pair can be improved, and the problems of coating falling, wear, poor lubrication and the like of the enhanced liquid metal sliding bearing in a high-vacuum, high-temperature, high-pressure, high-speed and high-load use environment are effectively solved. High-pressure sealing is formed on the gaps between the stator and the rotor and between the limiting rings of the stator and the rotor, the liquid metal is kept in the bearing, the assembled bearing does not need a vacuum environment in the transfer process, meanwhile, external gas is prevented from entering the bearing structure, and the possibility that the liquid metal leaks or gets stuck is reduced.

The invention relates to a hydrodynamic or hydrostatic sliding bearing (1) for the rotatable support of a shaft (3), in particular in a wind turbine (2), with at least one first sliding element (4) having a first sliding surface (5), which is arranged radially and / or axially displaceable on a connection structure (6), wherein a first ramp section (7) is formed on the at least first sliding element (4) and a corresponding second ramp section (8) is formed on the connection structure (6) such that an axial displacement of the sliding element (4) relative to the connection structure (6) causes a radial displacement of the sliding element (4) and / or vice versa, so that the bearing clearance of the sliding element (4) relative to the shaft (3) is adjustable, wherein the at least first sliding element (4) is held clamped relative to the connection structure (6) by means of at least one clamping element (9) which is displaceable relative to the connection structure (6).

The invention discloses a sliding bearing-rotor system stability test system and method under an impact load, and relates to the field of rotating machinery test in mechanical engineering. According to the technical scheme, different types of impact loads are applied through a vibration acceleration platform, and starting, stopping or external impact force in actual working conditions is simulated. In the testing process, a high-precision sensor and a multi-channel acquisition board card are used for monitoring the vibration characteristic and the rotating speed of the system in real time, it is guaranteed that signals of different positions and types can be synchronously acquired, and comprehensive system state information is provided. Then, in combination with time domain and frequency domain analysis technologies, key features are extracted from mass data by applying an advanced Fourier transform algorithm, the resonant frequency, modal characteristics and potential fault modes of the system are identified, and accurate evaluation of the stability of the system is realized. Experimental results show that the real-time monitoring and analysis method can effectively improve the stability test precision of the sliding bearing-rotor system under the impact load, and provides powerful technical support for engineering application. The method is used for evaluating the stability of the sliding bearing-rotor system under the impact load.

The invention discloses a method and system for measuring the ultrasonic proportionality coefficient of the thickness of a lubricating film of a sliding bearing, and the method comprises the steps: firstly, obtaining the comprehensive response coefficient of sound waves in a transition combination layer of a substrate and a lining through calculating the proportionality coefficient of a reflection echo signal of a bearing bush in an air medium and a reflection echo signal of a substrate-lining interface; characterizing the propagation rule of sound waves in a base body and lining combination layer; secondly, a proportionality coefficient is constructed based on a lubricating film reflection echo signal and a matrix-lining interface reflection echo signal, a lubricating film reflection coefficient is calculated in combination with a comprehensive response coefficient of sound waves in a matrix-lining transition combination layer, and finally the thickness of the lubricating film is solved through a resonance model method or a composite model method. According to the invention, the influence of the change of the binding force between the sensor and the substrate and the unstable voltage of ultrasonic pulse emission equipment on the reference signal can be avoided, the robustness is high, and the long-term reliable monitoring of the thickness of the lubricating film of the sliding bearing is facilitated.

Disclosed in the present invention are a two-scale numerical value calculation method for the performance of a sliding bearing with the impact of roughness taken into consideration. The method solves the problem of the calculation accuracy and speed regarding the impact of roughness on lubrication performance of sliding bearings, and overcomes the problem of calculation being inaccurate and unsuitable in conventional methods without taking roughness into consideration. In the present invention, cavitation in sliding bearings is taken into consideration, and a fluid dynamic behavior model is established on the basis of roughness. In order to solve the problem of fluid dynamics in a macroscopic domain, a two-scale normalization method is provided, such that microscale effects are coupled into a macroscopic scale by means of finite difference partial derivatives, and then a response of a fluid dynamic behavior in a microscale domain to roughness is calculated by using the normalization method; and a linearization method is provided to calculate finite difference partial derivatives. The present invention provides a two-scale normalization-based numerical value calculation method for the bearing capacity and friction coefficient of a sliding bearing, thereby providing a more accurate and more universally applicable method for numerical value calculation of the performance of sliding bearings with the impact of roughness taken into consideration.

The invention provides a radial sliding bearing with a groove-type textured surface and a friction testing method thereof.The radial sliding bearing comprises a bearing, a journal, lubricating oil and surface textures, the lubricating oil is arranged between the inner surface of the bearing and the outer surface of the journal, and the surface textures are in a groove type and are evenly distributed on the inner surface of the bearing; the shaft neck rotates around the geometric center of the shaft neck, so that lubricating oil in a bearing gap generates a fluid dynamic pressure effect to balance an external load; the centerline of the journal is parallel to the centerline of the bearing, and the film thickness of the lubricating oil in the bearing clearance is symmetrically distributed about the centerline of the bearing. According to the radial sliding bearing with the groove type textured surface and the friction testing method of the radial sliding bearing, distribution parameters and shape parameters of the surface texture are optimally designed, so that the bearing with the textured surface can obtain a more remarkable secondary fluid dynamic pressure effect, and the tribological performance of a friction pair interface of the radial sliding bearing is improved.

The invention provides a horizontal sliding bearing test bed, which belongs to the field of sliding bearing safety operation and detection and comprises a main transmission system, a driving system, a radial loading system, a heating system and a hydraulic system. A sliding bearing seat in the radial loading system is inversely fixed on a lower loading plate and is detachably sleeved and fixed on a test bearing, and a test bed applies pressure to the lower loading plate through a hydraulic cylinder to apply radial load to a test sliding bearing. A rotary swing hydraulic oil cylinder in the main transmission system provides power to test the horizontal sliding bearing. The hydraulic system is connected with the rotary swing hydraulic oil cylinder and the radial loading oil cylinder and can achieve closed-loop control over torque and radial loading force. The heating system simulates a high-temperature working condition through a heating box, and a test bearing can be set to be tested at a specific high temperature. According to the invention, large load detection can be realized, working condition simulation is accurate, data such as bearing working torque and service life can be detected, and comprehensive and multi-size adaptability is realized.

The utility model discloses a bearing bush oil sealing structure of a sliding bearing, which comprises a shaft, a bearing bush box, a bearing bush and an air blowing chamber, the shaft penetrates through the bearing bush box, the bearing bush is arranged in the bearing bush box, a second sealing packing is arranged on the right side of the bearing bush box, and a second sealing ring is arranged on the inner side of the second sealing packing. A third sealing packing is arranged on the right side of the second sealing packing, an air sealing cavity is formed between the second sealing packing and the third sealing packing, an air guide wing is arranged in the air sealing cavity and is in a conical trumpet shape, and a trumpet-shaped large opening of the air guide wing is in threaded connection with the side face, close to the bearing bush, of the interior of the third sealing packing; a trumpet-shaped small opening of the air guide wing is obliquely opposite to the direction of the second sealing ring; the structure is simple in design and low in improvement cost, positive pressure gas is introduced into the gap between the inner ring of the sealing ring and the shaft through the blowing chamber, and the oil gas pressure in the bearing bush chamber is kept in a slightly positive pressure state, so that the oil gas can be prevented from overflowing into a motor body from the fit gap between the second sealing ring and the motor shaft.

The embodiment of the invention provides a preparation method of a sliding bearing composite coating and the sliding bearing composite coating, and relates to the technical field of surface engineering.The method comprises the steps that nickel-based base coat alloy powder and copper-based alloy surface layer powder are dried; a cladding head is aligned with a to-be-cladded area of the sliding bearing, nickel-based priming layer alloy powder is evenly fed into the surface, aligned with the cladding head, of the sliding bearing through a scraping disc type pressure powder feeder on the basis of first technological parameters, the nickel-based priming layer alloy powder is molten into molten drops, and the molten drops and the surface of the sliding bearing form a micro molten pool; carrying out continuous cladding to form a nickel-based bottoming layer; and after the sliding bearing with the surface cladded with the nickel-based bottom layer is cooled, the nickel-based bottom layer is polished to be smooth, copper-based alloy surface layer powder is evenly fed into the surface of the nickel-based bottom layer through a scraping disc type pressure powder feeder on the basis of second technological parameters, and the copper-based alloy surface layer is formed on the surface of the nickel-based bottom layer through continuous cladding. And the sliding bearing clad with the composite coating is obtained. The quality can be improved.

The invention discloses a sliding bearing-rotor system stability test system and method under a complex alternating load, and relates to the field of rotating machinery test in mechanical engineering. According to the technical key points, a multi-direction and multi-frequency dynamic load is applied through a six-degree-of-freedom platform, and a complex vibration and stress environment in an actual working condition is simulated. In the testing process, a high-precision sensor and a multi-channel acquisition board card are used for monitoring the vibration characteristic and the rotating speed of the system in real time, it is guaranteed that signals of different positions and types can be synchronously acquired, and comprehensive system state information is provided. Then, in combination with time domain and frequency domain analysis technologies, key features are extracted from mass data by applying an advanced Fourier transform algorithm, the resonant frequency, modal characteristics and potential fault modes of the system are identified, and accurate evaluation of the stability of the system is realized. Experimental results show that the real-time monitoring and analyzing method can effectively improve the stability testing precision of the sliding bearing-rotor system under the complex alternating load, and powerful technical support is provided for engineering application. The method is used for evaluating the stability of the sliding bearing-rotor system under the complex alternating load.

A wing for an aircraft, including a main wing and a slat assembly including a slat and at least one connection assembly movably connecting the slat to the main wing, such that the slat is movable between a retracted position and at least one extended position, such that the connection assembly has an elongate slat track, and the front end of the slat track is mounted to the slat, such that the rear end and / or the intermediate portion of the slat track are mounted to the main wing by a roller or slide bearing such that the slat track is movable along the track longitudinal axis, such that the connection assembly has a drive unit configured for driving the slat track, such that the drive unit includes a rotary actuator having at least one drive arm rotatably driven about a rotation axis and drivingly engaging the slat track.

When a sliding main bearing of a wind driven generator is under a heavy-load working condition, a lubricating oil film in a starting stage is not enough to form a complete fluid lubricating film, namely, a friction surface forms a boundary lubrication state, and friction in the stage seriously affects the service life of the bearing. In this way, a macroscopic model and a microscopic model are coupled, and a multi-scale model is verified through experiments. The macroscopic model is established based on an actual structure of a wind power main shaft sliding bearing, and is equivalent to a three-layer structure of a rigid bearing base, an elastic surface supporting layer and a main shaft; a three-layer microcosmic molecular model representing'main shaft-lubricating oil-elastic supporting layer 'is established by the microcosmic model facing the boundary lubrication state of a friction pair. Wherein the thickness of the supporting layer is changed by the macroscopic model, the components of the supporting layer material are changed by the microscopic model, the friction coefficient of the tribological interface under different supporting layer thicknesses and material components is analyzed through the macro-micro cross-scale analysis model, and the optimal thickness and the optimal material component proportion suitable for the service condition of the wind power main shaft sliding bearing are obtained.

The invention discloses a variable-damping tilting pad bearing, and relates to the technical field of sliding bearings. Comprising an upper half bearing shell, a lower half bearing shell, spherical supports, oil injection devices, tilting pads and bearing end covers, the upper half bearing shell and the lower half bearing shell form an annular bearing shell, the tilting pads are arranged on the inner side of the annular bearing shell and distributed at equal intervals in the circumferential direction, and the spherical supports are installed between the pad backs of the tilting pads and the annular bearing shell. The oil spraying devices are arranged between the adjacent tilting pads, the bearing end covers are installed on the two axial sides of the annular bearing shell, and through drainage holes are formed in the spherical supports and the tilting pads. Lubricating oil sprayed into the tile surfaces of the tilting tiles from an oil spraying device forms a high-pressure power oil film on the tile surfaces, part of the high-pressure lubricating oil enters the space between the spherical support and the annular bearing shell through the through drainage holes, high-pressure radial jacking force is formed, the spherical support is jacked up, and a static-pressure oil film is formed between the spherical support and the annular bearing shell. And the supporting damping of the tilting pad is improved.

The invention relates to a turbine tilting pad sliding bearing lubricating oil device and an oil temperature adjusting method. The lubricating oil device comprises an oil inlet pipe and an oil supply pipe. A mounting part is arranged at the oil outlet end of the oil inlet pipe and is provided with a rotating hole; the oil supply pipe is rotationally arranged on the rotating hole, and an oil spraying hole is formed in the outer side wall of the oil supply pipe; a rotating shifting block is arranged on the outer side wall of the oil supply pipe, a mounting groove is formed in the inner side wall of the rotating hole, an arc-shaped groove coaxial with the rotating hole is formed in the mounting groove, and the sliding end of the rotating shifting block is slidably arranged on the arc-shaped groove and divides the mounting groove into a supporting groove and a driving groove in the circumferential direction of the rotating hole; one end of the elastic piece is connected to the groove wall, away from the rotating shifting block, of the driving groove, and the other end of the elastic piece abuts against the rotating shifting block. The driving groove is filled with a driving body, and the driving body abuts against the rotating shifting block. The system can automatically adjust the temperature of the lubricating oil, has the characteristics of rapidness and high reliability, and can meet the requirement of rapid load change of a coal power unit under a novel power system.

The invention discloses a fan main shaft bearing testing machine, which belongs to the field of fan bearing testing, solves the problems of complicated testing structure, complicated testing steps and inaccurate testing in the prior art, and adopts the technical scheme that the fan main shaft bearing testing machine comprises a platform, a main shaft arranged on the platform in a split manner, and a driving assembly for driving the main shaft to rotate, the platform is further provided with a testing station which is located in the radial direction of the main shaft and used for testing a bearing bush of a single sliding bearing, the testing station is provided with a first pressure sensor, a second pressure sensor and a loading unit, and the first pressure sensor is used for detecting oil film pressure between the bearing bush of the sliding bearing and the main shaft; the loading unit is used for driving a bearing bush of the sliding bearing in the radial direction of the main shaft so as to provide radial loading force for the bearing bush of the sliding bearing, and the second pressure sensor is used for detecting the radial loading force provided by the loading unit. According to the invention, the test structure and the test steps are simplified while the test accuracy is mainly improved.

The invention relates to a repeatedly detachable magnetic composite water lubricated bearing and a maintenance method thereof.The water lubricated bearing comprises a cylindrical bearing seat surrounding a ship stern shaft and a permanent magnet assembly detachably connected with the bearing seat, a cylindrical sliding bearing is arranged on the inner side of the bearing seat, a notch is formed in the outer side face of the sliding bearing, and the permanent magnet assembly is detachably connected with the bearing seat; the notch penetrates through the sliding bearing in the axis direction of the sliding bearing, a containing groove used for containing the permanent magnet assembly is defined between the notch and the inner side wall of the bearing seat, when the water lubrication bearing is arranged on the outer side of the ship tail shaft in a sleeving mode, the containing groove is located over the ship tail shaft, and the permanent magnet assembly is in sliding fit with the containing groove in the axis direction of the sliding bearing. According to the scheme, the permanent magnet is configured to be in a detachable form, and the permanent magnet can be conveniently maintained after being demagnetized, so that the maintenance cost of the water-lubricated bearing is reduced, and the load of the water-lubricated bearing can be reduced for a long time.

The invention particularly provides a thermal elastohydrodynamic lubrication reliability evaluation method for a wind power sliding bearing. The method comprises the following steps: acquiring evidence measurement combination parameters; converting the evidence measurement combination parameters into probability measurement combination parameters, and determining mean value data of the probability measurement combination parameters; constructing a sample collection center based on the probability measurement combination parameters, substituting the sample collection center into the thermal elastohydrodynamic oil film iteration analysis model, and outputting minimum oil film thickness data; constructing a quadratic polynomial response surface function based on the current oil film safety threshold value, and selectively updating the sample collection center based on the quadratic polynomial response surface function to enable the sample collection center to approach the maximum possible failure focal element; determining credibility data and likelihood data of thermal elastohydrodynamic lubrication of the wind power sliding bearing based on the maximum possible failure focal element; and changing an oil film safety threshold value, and circularly executing the steps to obtain a thermal elastohydrodynamic lubrication reliability analysis result of the wind power sliding bearing. The accuracy of reliability is ensured, and the calculation cost is reduced.

The invention relates to a hydrophilic and hydrophobic controllable magnetorheological rubber-foam metal bearing which is characterized in that a magnetorheological rubber-foam metal shaft sleeve is uniformly divided into n arc-shaped section units along the circumferential direction, and i water film sensors are arranged in each arc-shaped section unit along the axial direction of the magnetorheological rubber-foam metal shaft sleeve, two copper electrodes are led out from two ends of each water film sensor; j electromagnetic coils are arranged outside each arc-shaped section unit in the axial direction of the magnetorheological rubber-foam metal shaft sleeve, the two poles of each electromagnetic coil are fixed to the periphery of the magnetorheological rubber-foam metal shaft sleeve, gaps between the adjacent electromagnetic coils and the bearing shell are filled with iron blocks, and the iron blocks and the electromagnetic coils form a magnetic flux loop; the problems that due to the fact that the shaft sleeve material performance and the interface lubricating state of a traditional rubber bearing cannot be adjusted, the bearing capacity of a water-lubricated rubber bearing is insufficient, the hydrophilicity and hydrophobicity of a lubricating interface cannot be adjusted, noise reduction and abrasion resistance are insufficient, and performance improvement of a rubber sliding bearing is limited are solved.

The invention relates to the technical field of bearing pedestals, and discloses a sliding bearing pedestal which comprises a lower outer ring, an upper outer ring, a lower bearing bush and an upper bearing bush, a cooling pipe is arranged in a containing groove, the outer surface of a turbulent flow shaft is fixedly sleeved with a plurality of turbulent flow blades, and the end, located in a turbulent flow box, of a movable rod is fixedly connected with a rack. The outer surface of the transmission shaft is fixedly sleeved with a transmission gear, one side of the connecting plate is fixedly connected with a triangular block, and the outer surface of the upper bearing bush is fixedly connected with a shifting rod. When the upper bearing bush rotates, a shifting rod is driven to be matched with a triangular block, extrude a connecting plate and enable a rack to move, and is matched with a transmission gear, a driving bevel gear and a driven bevel gear, so that a turbulent flow shaft drives turbulent flow blades to rotate to turbulent flow cooling water in the cooling pipe, and the heat exchange speed between the cooling water in the cooling pipe is increased; the cooling water is fully subjected to heat exchange with heat generated when the bearing seat works, so that the heat exchange efficiency is greatly improved.

The invention discloses a sliding bearing health monitoring and equipment fault diagnosis system and method based on digital twinning, and relates to the field of fault prediction and health management. In order to solve the problems that in the prior art, the influence of bearing abnormity or a sub-health state on the health of an equipment shafting cannot be judged, and time accumulation fault prediction of the sub-health state on dynamic characteristics and abrasion of a liquid film cannot be quantified, bearing displacement and rotating speed are collected through an eddy current and rotating speed sensor; solving a Reynolds equation and an Archard wear equation through multi-physics field simulation coupling, and generating a sample library of pressure, film thickness, rigidity damping and wear loss; the displacement, the rotating speed and the load are mapped to liquid film parameters and dynamic characteristics in real time through a POD-Kriging reduced-order model; and based on the film thickness ratio and the 0.5 X frequency amplitude grading lubrication state, vortex motion early warning is triggered according to the rotating speed ratio, and bearing health state all-parameter monitoring and multi-stage safety early warning are achieved. The method has a good application prospect in the field of intelligent operation and maintenance.

A spindle drive for a vehicle steering gear, including a spindle having an external thread and a spindle nut having an internal thread being guided on the external thread. One of the spindle and spindle nut is rotatable and produces a corresponding translational movement of the other. The other of the spindle and spindle nut is guided via a plain bearing along the axis of rotation relative to a fixed structural part. The plain bearing is formed between sliding surfaces of a first and second bearing part, the first being provided on the other of the spindle and spindle nut and the second being provided on the fixed structural part. One of the first and second bearing parts is designed as an elevation, the other being designed as a recess. The recess surrounds the elevation on both sides in a rotational direction.

The invention belongs to the technical field of wind driven generator main bearing test equipment, and discloses a five-degree-of-freedom wind driven generator main bearing test bench for simulating real working conditions, which comprises a loading system, a test system and a driving system. The loading system adopts a sliding bearing loading disc to simulate a hub of the wind driven generator, and adopts a hydraulic cylinder array to simulate five-degree-of-freedom hub loads of three-direction forces including axial force, radial force and vertical force and two-direction moments including pitching moment and yawing moment. The test system adopts a two-point supported tapered roller bearing main shaft system to simulate the main shaft configuration of the wind driven generator, and can be independently disassembled to replace the model of a test bearing. The driving system adopts a variable-frequency and variable-speed motor, the rotating speed range is 0-200 rpm, and the requirements of various working conditions such as frequent start and stop, performance tests and strengthening tests can be met. According to the invention, through multi-dimensional load loading and multi-working-condition simulation, a key platform is provided for reliability test and failure mechanism research of the wind power main bearing.

The high-efficiency magnetic drive pump comprises a pump body, a suction cover is fixedly connected to one side of the pump body, a cover plate is fixedly connected to the side, away from the suction cover, of the interior of the pump body, a bearing body is fixedly connected to the side, away from the suction cover, of the pump body, and a pump shaft is rotationally connected to the interior of the bearing body; an impeller is arranged in the pump body, and impeller back blades are arranged on the side, away from the suction cover, of the impeller. The invention relates to the technical field of magnetic drive pumps, and solves the problems that in the prior art, in order to ensure that a magnetic drive pump is completely free of leakage, an isolation sleeve is usually made of a metal material, eddy current loss generated in an alternating magnetic field releases energy in a heat form, the power of the magnetic drive pump is consumed, and in order to take away the eddy current loss and heat generated by operation of a sliding bearing, the sliding bearing is damaged. The sliding bearing is lubricated and cooled by a part of medium at a shunting position of an outlet of the magnetic drive pump and heat generated by eddy current loss is taken away, so that the volume loss is increased, and the working efficiency of the whole machine is reduced.

The invention provides a sliding bearing oil film lubrication reliability evaluation method, and relates to the field of oil film lubrication reliability diagnosis, and the method comprises the steps: building a minimum film thickness limit state function according to a bearing minimum oil film thickness calculation equation and a preset minimum oil film thickness threshold value, and determining a reliability domain, iteratively solving the minimum oil film thickness through an elastohydrodynamic lubrication equation, and solving a non-probabilistic reliability index and designing a checking point through a numerical optimization algorithm; according to a non-probability reliability index, designing a checking point and a relation between an uncertain domain and a reliable domain to judge a joint focal element needing extreme value analysis, inheriting maximum and minimum values of the joint focal element by using an intelligent genetic method, and obtaining credibility and likelihood under a threshold value; and according to the above steps, obtaining the credibility and the likelihood under each minimum oil film thickness threshold value, and determining an accumulated credibility function curve and an accumulated likelihood function curve used for evaluating the reliability degree. In this way, focal elements needing extreme value analysis are reduced, and the efficiency of evaluating the lubricating reliability of the oil film of the sliding bearing is improved.

The invention discloses a unit sliding bearing fault identification method and system based on vibration and temperature cooperation. At present, a traditional sliding bearing fault diagnosis method cannot accurately predict the working state of a sliding bearing, and is not beneficial to prevention of faults such as large vibration, bearing fragmentation and bearing metal shedding of large rotating equipment. The fault identification method comprises the following steps: acquiring vibration and temperature data of a sliding bearing of a unit by using a data acquisition system; performing trend and spectrum analysis on the collected vibration data to generate a vibration trend graph, a time domain graph and a spectrogram; performing trend analysis on the acquired temperature data to generate a temperature trend chart; performing collaborative analysis on the vibration and temperature data by using the vibration trend chart, the time domain chart, the spectrogram and the temperature trend chart to obtain an analysis result; and judging the fault of the sliding bearing according to the analysis result. Bearing vibration and temperature signals are fully utilized, and the accuracy degree of sliding bearing state detection is effectively improved.

The invention relates to a sliding wear performance evaluation method of a sliding bearing, a sliding wear testing machine and application. The method comprises the following steps: acquiring initial-state benchmark characterization of a sliding bearing sample, placing the sliding bearing sample at a test station of the sliding wear testing machine, outputting lubricating oil, collecting a process oil sample, and acquiring final-state characterization of the sliding bearing sample after the test is completed; on the basis of initial state benchmark characterization, process oil sample analysis data, final state characterization and working condition parameters applied by a sliding wear testing machine, the wear stage and the wear mechanism are analyzed, and the sliding wear performance of the sliding bearing is evaluated; a sliding shaft supporting module, a rotating power module, an oil supply lubricating module and a radial load pressurizing module are arranged on the testing machine matching platform; the method is applied to wear resistance evaluation of sliding bearings prepared by adopting different processes. According to the invention, the core working condition of the actual dynamic pressure bearing is accurately reproduced, the stability and durability of the test system are improved, and the occurrence, development and evolution process of wear is visualized and quantifiable.

The invention provides a thrust sliding bearing, a shaft system and a wind generating set. The thrust sliding bearing comprises a thrust disc, a thrust supporting disc and a first bearing bush. The thrust disc is arranged on the rotating shaft and protrudes outwards in the radial direction relative to the rotating shaft; the thrust supporting part is opposite to the thrust disc in the axial direction of the rotating shaft, and the bearing bush assembly is fixedly installed on the axial side surface of the thrust disc, makes sliding contact with the thrust supporting part and can rotate along with the thrust disc. According to the thrust sliding bearing provided by the embodiment of the invention, the bearing bush assembly is fixedly mounted on the thrust disc, when the bearing bush assembly needs to be maintained or replaced, the thrust disc can be driven to rotate through the rotation of the rotating shaft, and under the condition, the bearing bush assembly can rotate along with the thrust disc, so that the bearing bush assembly can rotate along with the thrust disc; when the bearing bush assembly needs to be replaced, the bearing bush assembly needing to be replaced can be rotated to the upper non-load point, so that the bearing bush assembly can be detached from the rotating shaft under the condition that the bearing bush assembly needing to be replaced does not bear load, and the operation and maintenance difficulty can be remarkably reduced.