182 results about "Bearing design" patented technology

The invention discloses a self-balancing tilting-pad thrust bearing, and relates to the field of sliding bearing design. In order to solve the problems that when an existing thrust bearing is applied to the working condition that a mechanical rotor rotates at a high speed, the axis of the rotor is likely to deflect due to machining quality, self vibration and the like, then a bearing bush of the thrust bearing is stressed unevenly, unbalance loading is generated, and the service life of the thrust bearing is shortened. A double-layer balance block structure is adopted to automatically adjust the stress state of the thrust pads, so that each thrust pad is in uniform contact with the thrust disc, uniform stress among the thrust pads is realized, and the dynamic stability of a mechanical rotating system is improved; the thrust bearing structure can automatically adjust the problem of unbalanced stress between tilting pads of a sliding thrust bearing caused by manufacturing errors, assembly errors and stress states, the reliability and maintainability of the thrust bearing are improved, and the service life of the thrust bearing is prolonged. The invention is suitable for the technical field of thrust bearings.

The invention discloses an automatic measuring device and measuring method for dynamic and static friction torques of medium and large-sized bearings, and belongs to the technical field of bearing detection.The device comprises a bearing assembly, a moving plate is arranged on the bearing assembly, a rotating motor is connected to the bottom of the bearing assembly, and a driving shaft system is arranged on an output shaft of the rotating motor; the top end of the driving shaft system is provided with an inner ring fixing mandrel, the upper surface of the moving plate is connected with a torque sensor through an upper fixing frame, the bottom end of the torque sensor is provided with a measuring shaft system, the bottom end of the measuring shaft system is sleeved with a center adjusting assembly through two guide columns, the bottom of the center adjusting assembly is provided with an outer ring loading tool, and the outer ring loading tool is provided with an inner ring. Under the cooperation of the structure, not only can the dynamic friction torque be measured, but also the multi-point static friction torque can be automatically measured, more comprehensive bearing friction characteristic data are provided, and optimization of bearing design and model selection is facilitated.

An internal feedback hydrostatic bearing and a hydrostatic spindle structure relate to the field of bearing design. The problems that according to an existing hydrostatic bearing, hydraulic oil in an oil inlet cavity and an oil collecting cavity still easily enters a bearing oil cavity on the side, and consequently the rotating precision of a main shaft borne by the hydrostatic bearing is insufficient and unstable are solved. N pairs of throttlers are arranged, and the two throttlers in each pair are arranged on the two sides of the radial direction and / or the two sides of the axial direction of the main shaft correspondingly; each throttler comprises an oil inlet groove, an oil collecting groove and a bearing oil groove, the oil collecting groove surrounds the oil inlet groove, two opposite groove edges of the oil inlet groove are oil sealing edges, the other two opposite groove edges of the oil inlet groove are throttling edges, the throttling edges are configured to be gap throttling openings, and pressure oil in the oil inlet groove can be pressed into the oil collecting groove from the gap throttling openings; the peripheral groove edges of the oil collecting groove and the bearing oil groove are oil sealing edges, the oil collecting groove is communicated with the bearing oil groove of the other throttler, and pressure oil in the oil collecting groove is pressed into the bearing oil groove of the other throttler to achieve internal feedback.

The invention discloses an ultra-high-temperature heavy-load self-aligning roller bearing optimization design method and system based on a particle swarm algorithm, belongs to the field of rolling bearing optimization design, and solves the problems that a traditional bearing design process is low in efficiency, and multi-target collaborative optimization is difficult to achieve. And the design method combining the empirical formula and the finite element model is poor in precision due to the strong coupling characteristic of the material nonlinearity, the thermal coupling effect and the bearing performance under the ultra-high-temperature heavy-load working condition. The method comprises the following steps: S1, determining a bearing parameter, a working condition parameter and a particle swarm algorithm parameter; s2, establishing an optimization model of the ultrahigh-temperature heavy-load self-aligning roller bearing: S21, establishing a target function; s22, determining a design variable; s23, establishing a constraint equation; and S3, optimizing corresponding parameters of the bearing by adopting a particle swarm algorithm to obtain an optimization result. The method is suitable for a self-aligning roller bearing optimization design scene.

The invention relates to a temperature sensor integrated with a bearing and a preparation method and application thereof, and relates to the technical field of bearing diagnos.The temperature sensor comprises a multi-layer composite film resistance grid structure, and a composite film sequentially comprises a bearing substrate, a transition seed layer, an insulating layer, a sensing layer and a wear-resistant protective layer from inside to outside; by adding the transition seed layer between the bearing substrate and the insulating layer, the binding force between the insulating layer and the bearing substrate is enhanced, the probability of sensor failure caused by large difference of thermal expansion coefficients of the insulating layer and the bearing substrate is reduced, and the use effect of the sensor is improved; in-situ real-time temperature sensing is realized by adopting a scheme of coating a film on a bearing raceway, the scheme starts from the source of a fault, an intelligent diagnosis technology and criterion based on the temperature of a bearing contact area are formed, bearing fault detection methods are enriched, forward guidance is formed for bearing design, and the bearing fault detection efficiency is improved. And a new idea is provided for an aviation high-speed light-load bearing fault diagnosis technology.

The invention relates to the technical field of steel structure construction, and particularly discloses a steel structure welding butt joint device for steel structure construction, which comprises a fixing structure, a first supporting structure and a second supporting structure, the fixing structure is detachably clamped on a bearing column or a cross beam of a steel structure, the first supporting structure is detachably arranged on the fixing structure, and the second supporting structure is detachably arranged on the bearing column or the cross beam of the steel structure. The first supporting structures can be located on the front side and the rear side or the left side and the right side of the fixing structure, the first supporting structures are used for bearing and limiting steel structures in butt joint, the second supporting structures are detachably arranged on the fixing structure, and the second supporting structures can be located on the front side and the rear side of the fixing structure. The two sides of one side of the H-shaped steel frame are clamped and locked through the clamping bases, and stable clamping is achieved; meanwhile, steel frames in various shapes such as a rectangular shape, a square shape and a round shape can be clamped, fixed and subjected to bearing butt joint limiting through the clamping and bearing design, and butt joint devices do not need to be independently arranged for the steel frames in different shapes and specifications.

The invention relates to the technical field of sliding bearing design in mechanical engineering, in particular to a sliding bearing multi-mode end-to-end intelligent design system based on a large model. Comprising a multi-modal input and feature recognition module, a high-fidelity performance prediction module, a structural parameter intelligent optimization decision module and a parametric modeling and multi-modal output module which are connected in sequence and form an intelligent design closed loop, and all the modules are seamlessly connected through data interfaces. According to the method, multi-modal input and a high-fidelity simulation closed loop are driven through a large language model, the sliding bearing design efficiency is remarkably improved, the technical threshold is greatly reduced, interaction between a natural language and a drawing is supported, and non-experts can complete high-performance design; full-process automation from requirements to drawings is achieved, and manual intervention errors are avoided; optimizing in a wide-area parameter space by using the large model reasoning capability to realize multi-target global optimization; and multi-modal input and output of texts, drawings and models are supported, and the engineering applicability is enhanced.

The invention belongs to the field of bearing design theories, and discloses a full complement CARB bearing design method based on an elastohydrodynamic lubrication bearing model. The viscosity-pressure coefficient, the basic viscosity and the elastic modulus are integrated to oil film thickness calculation for the first time by establishing a joint objective function of the maximum dynamic load and the elastic flow lubrication minimum film thickness, and the dynamic load coefficient is adopted to correct the actual working condition deviation. A complete system containing 21 constraints is constructed, and five dimensions of geometric compatibility, contour matching, motion compensation, intensity life and manufacturing boundary are covered. The design variables including the curvature radius, the roller diameter and the pitch circle diameter are solved through a multi-objective optimization algorithm, collaborative maximization of the bearing capacity and the lubricating performance is achieved, and the problem that in a traditional design theory, curvature parameters are difficult to accurately determine is solved.

The invention relates to an axial-radial bearing (1) for a machine tool, comprising an outer ring (2) provided for attachment to the machine tool and an inner ring (3) mounted axially and radially thereto via a plurality of rolling elements (4), which inner ring is provided for attachment to a drivable shaft washer (5), wherein the shaft washer (5) has a toothing (6). The invention also relates to a machine tool with such an axial-radial bearing (1) designed as a rotary table bearing.

The invention discloses a cylindrical roller modification method based on a non-uniform rational B-spline curve, and relates to the technical field of bearing design. According to the method, a bearing contact mechanical model considering the roller modification effect is constructed, a modification contour is constructed based on a non-uniform rational B-spline curve (NURBS curve), an optimization model with the basic reference rated life of a bearing as a target function is established on the basis of meeting geometric constraint conditions, and an optimization algorithm is adopted for solving to obtain a final modification curve. The established contact mechanical model comprises a bearing static balance model and a roller-raceway contact mechanical model and is used for calculating load distribution and contact stress under the unbalance loading working condition. Compared with a traditional symmetrical logarithmic modification method, the problem that the axial stress of the roller is not uniform under unbalance loading can be effectively solved, the uniformity of contact stress distribution is improved, and the fatigue life of the bearing is prolonged.

The invention discloses a decoupling design method and system for reliability optimization of an angular contact ball bearing. The method comprises the following steps: determining initial design parameters of the angular contact ball bearing; constructing a reliability optimization design model which takes maximization of the rated dynamic load as a target and comprises probability reliability constraint processed by a penalty function; constructing a design variable and failure probability mapping agent model, specifically, identifying and quantifying uncertainty parameters, constructing a quasi-statics model and a limit state function, calculating the failure probability of a sample point through a probability reliability method, and training the agent model taking the design variable as input and the failure probability as output; and based on the proxy model, solving the reliability optimization design model by using an optimization algorithm, and outputting optimal bearing design parameters. According to the method, the reliability analysis process and the optimization iteration process are decoupled, so that the optimization efficiency is greatly improved while the design robustness is ensured.

The invention belongs to the technical field of computer aided design and mechanical engineering, and relates to a parameterized three-dimensional automatic modeling and assembling system and method for a rolling bearing. The system comprises a parameter input module used for obtaining bearing design parameters; the part modeling module is used for generating an inner ring model, an outer ring model, a rolling body model and a retainer model which comprise preset assembly reference surfaces according to the parameters; the assembly logic module is used for automatically positioning the respective three-dimensional models of the multiple parts of the rolling bearing in a three-dimensional space and constructing a complete bearing assembly so as to generate a complete rolling bearing; and the auxiliary function module is used for providing model file management, modeling process visualization and data output functions. The method has the beneficial effects that the traditional dependence on a solid geometric surface is replaced by abstract association of the reference surface and the coordinate system, and high automation, stabilization and parameterization of the modeling and assembling process are realized.

The invention discloses a sliding bearing structure of a wind power partitioned elastic trapezoidal main shaft. Comprising a segmented sliding bearing design, and trapezoidal cross-section staggered structures are symmetrically arranged between contact surfaces of a bearing unit and a main shaft. Aiming at the problems of weak self-aligning capability, concentrated contact stress and the like caused by insufficient elastic compensation of a wind power main bearing under high load, optimization is realized through the following innovations: a trapezoidal structure is additionally arranged on the contact surface of a block bearing, and the overall radial compliance of the bearing is enhanced by utilizing the elastic deformation characteristic of a trapezoidal cross section staggered structure; the elastic units are distributed in a gradient mode in the circumferential direction, a self-adaptive oil film pressure field is formed by combining the elastic units with the stepped lubricating flow channels, and the unbalance loading compensation capacity and the dynamic pressure lubricating efficiency of the spindle are synchronously improved. The gaps promote heat dissipation circulation and discharge of abrasion chippings, and local abrasion is avoided. By means of the structure, when the main shaft is strongly bent or moves, displacement deviation is absorbed through deformation of the elastic units, the self-aligning angle is increased, the contact stress peak value of the edges of the partitioning units is reduced, and the eccentric wear risk is reduced.

The invention relates to an axial permanent magnet suspension bearing based on electromagnetic suspension and a control system thereof, the axial permanent magnet suspension bearing comprises an axial permanent magnet suspension bearing stator, an axial permanent magnet suspension bearing rotor, a load, an axial permanent magnet bearing and two radial electromagnetic bearings, the axial permanent magnet suspension bearing rotor and the radial electromagnetic bearings are both mounted in the axial permanent magnet suspension bearing stator; the axial permanent magnet bearing is installed on the axial permanent magnet suspension bearing rotor, the axial permanent magnet suspension bearing rotor is connected with a load, the axial permanent magnet suspension bearing rotor penetrates through the radial electromagnetic bearings and the axial permanent magnet bearing, and the radial electromagnetic bearings are located on the two sides of the axial permanent magnet bearing. Axial suspension is realized through relative movement among a plurality of annular permanent magnets of the axial permanent magnet bearing. The radial control of the axial permanent magnet suspension bearing is realized, so that the axial permanent magnet suspension bearing designed based on a permanent magnet array suspension structure can work in an optimal suspension gap, and the buoyancy-weight ratio is greatly improved in the axial direction.

The invention belongs to the field of bearing manufacturing, particularly relates to a comprehensive stress analysis and calculation method for a main bearing of a shield tunneling machine, and mainly provides a comprehensive stress analysis and rapid calculation method for the design and checking process of the main bearing of the shield tunneling machine. According to the method, the force generated by the bolt, the contact force between the roller and the raceway surface, the contact force between the flange surface and the ferrule and the calculation method of the external force borne by the system are determined, the stress forms a resultant force matrix, a nonlinear equation set is solved to obtain a displacement matrix, and finally the bearing condition of each stress unit is obtained. According to the method, factors such as clearance, roller shaping and ferrule compression are considered, and the influence of interaction among the units on the bearing conditions of the units is considered, the stress conditions of the rollers, the bolts and the contact surfaces can be simply and quickly calculated, and a basis is provided for design and check of the main bearing of the shield tunneling machine.

The invention belongs to the field of bearing design, and particularly relates to a bearing gland nut anti-rotation structure which comprises a rotating shaft, a bearing, an annular clamping ring and a nut. The bearing, the annular clamping ring and the nut are coaxially arranged with the rotating shaft, the nut is in threaded connection with the rotating shaft, an inner ring of the bearing is fixedly connected with the rotating shaft, the corresponding side of the annular clamping ring is clamped and matched with the clamping groove, and the other side of the annular clamping ring is mechanically locked with the nut; the annular retainer ring is nitrided near the side surface of the bearing. Rectangular grooves and arc-shaped grooves are formed in the nut in a staggered mode, clamping blocks are arranged on the side wall of the annular clamping ring, the clamping blocks correspond to the rectangular grooves and the arc-shaped grooves, and the clamping blocks are matched with the rectangular grooves and the arc-shaped grooves in a clamped mode. In the working process, the annular clamping ring, the nut and the shaft are combined to prevent rotation, and an original T-shaped locking piece is replaced to prevent rotation; the side surface, close to the bearing, of the annular retainer ring is nitrided to improve wear resistance; through the measures, the reliability of the anti-rotation structure is ensured.

A motor vehicle drive system has a traction transmission device. A traction transmission drive shaft is rotatably mounted in a transmission device housing. A traction transmission intermediate shaft is rotatably mounted in the transmission housing. A traction transmission output shaft is rotatably mounted in the transmission housing device, and is arranged axially parallel to and radially spaced apart from the two other traction transmission shafts. The motor vehicle drive system is characterized in that three traction transmission shafts are each mounted in the traction transmission housing device with a fixed / floating bearing, these bearings each having a fixed bearing for absorbing axial forces and at least one floating bearing designed exclusively to absorb radial forces. The three fixed bearings are mounted in the traction transmission cover, and at least three of the floating bearings are mounted in the traction transmission housing.

A cover device (24) for a working machine (10) that is movable between an open and closed position, comprising: a panel (38) for covering an area of ​​the working machine (10), a support (32) for attachment to a supporting frame (12) of the working machine (10), a pivot arm (44) which is connected to the panel (38) by a first pivot bearing (46) and to the support (32) by a second pivot bearing (48), and a guide arm (50) which is connected to the panel (38) and the support (32) by a third pivot bearing (52) and a fourth pivot bearing (66), wherein the axes of rotation of the pivot bearings (46, 48, 52, 66) are oriented parallel to each other, characterized in that the fourth pivot bearing (66) is designed as a combined sliding and pivot bearing (66).

A high-temperature resistant lightweight composite material, its preparation method, and its applications are disclosed, relating to the field of composite material technology. This invention solves the problems of existing materials where it is difficult to simultaneously achieve high temperature resistance and lightweight, low structural efficiency due to the separation of heat protection and load-bearing design, insufficient temperature resistance and toughness of the sandwich layer, and difficulties and high costs associated with large-size molding. The material comprises an integrated co-cured outer heat-resistant layer, an intermediate transition layer, and an inner load-bearing layer. The outer heat-resistant layer uses a modified epoxy / cyanate copolymer resin as the matrix and a high-silica glass fiber and carbon fiber blended fabric as reinforcement, with fumed silica and carbon nanotube fillers incorporated into the matrix resin. The intermediate transition layer is polymethacrylamide foam. The inner load-bearing layer uses an epoxy-modified cyanate ester resin as the matrix and a carbon fiber biaxial plain weave fabric as reinforcement. This invention can be used in rocket fairings, hypersonic vehicle skins, spacecraft reentry capsule thermal protection structures, hypersonic missile shells, aircraft engine nacelles, or high-speed train front fairings.

The application discloses a processing and manufacturing method of a special-shaped bearing ring with a flange, which comprises a special-shaped bearing ring, a raceway diameter measuring mechanism and an auxiliary tool, the special-shaped bearing ring comprises a small outer circle, one side of the small outer circle is connected with a flange end face, an outer wall of the flange end face is provided with a large outer circle, a circular-arc-shaped shoulder is arranged at the connecting position of the flange end face and the small outer circle, a circular-arc-shaped groove and a U-shaped groove are arranged at the bottom of the flange end face at the same time, the circular-arc-shaped groove extends to the small outer circle, and the inner wall of the small outer circle is surrounded with a raceway; the method comprises the following specific steps: S1, turning: turning the approximate shape of the bearing; S2, soft grinding of double end faces; S3, soft grinding of the outer circle; and S4, turning of a large hole; the processing and manufacturing method of the special-shaped bearing ring with the flange has the effects of improving the bearing design and the processing flow, and can simultaneously achieve the effects of enhancing the bearing strength and guaranteeing the processing precision.

The present invention relates to the technical field of small metal parts for excavation components, in particular to a rotary excavation assembly and an excavation device having the assembly, including an arm mounted on an excavator body, a slewing unit is mounted at the end of the arm, a bucket cylinder group is mounted at the end of the slewing unit, and the end of the bucket cylinder group is mounted on the rear side wall of a bucket assembly. The bucket assembly includes a bucket part at the front end and a mixing part at the rear end. After the installation and positioning are completed, the inclination angle of the arm can be adjusted and locked by relying on the boom drive configured on the excavator; by using the first slewing bearing and the second slewing bearing designed in this application and cooperating with the boom configured on the excavator, the multi-angle adjustment and locking control of the rotary excavation assembly can be completed, effectively completing the adjustment and positioning of excavation, mixing, foundation pit rolling, and foundation pit side wall reaming.

The utility model relates to the technical field of bearing design, and discloses a wear-resistant bearing for an automobile radiator motor, which comprises a bearing column body, a bearing inner ring and a bearing inner side framework, a plurality of groups of middle rotating columns are arranged on the inner side of the bearing column body, and a group of upper rotating columns are arranged above each group of middle rotating columns. A group of lower rotating columns are arranged below each group of middle rotating columns, bearing inner rings are arranged on the inner sides of the middle rotating columns, and bearing inner side frameworks are arranged in the centers of the bearing inner rings. A rotating structure in the bearing is arranged to be a three-section vertically-supported columnar structure, the rotating shaft of the motor rotates to drive the rotating column arranged in the bearing to rotate, the friction force to the bearing column body, the upper frame and the lower frame is small, point-type abrasion of ball rotation to the bearing ring is changed, the buffering device is arranged in a matched mode, and the bearing ring is prevented from being damaged. Abrasion of a bearing structure caused by motor rotation can be effectively reduced, the wear resistance of the bearing is improved, and the service life of the bearing is effectively prolonged.

The utility model relates to the technical field of bearing design, and discloses a high-speed motor bearing for a dust collector, which comprises a bearing ring, a first sealing cover, a second sealing cover and a bearing contact frame, the bearing contact frame is arranged on the inner side of the bearing ring, and the first sealing cover is arranged at the bottom of the contact end of the outer end of the bearing contact frame and the bearing ring. A second sealing cover is arranged at the bottom of the inner wall of the bearing contact frame, a bearing bottom end cover is arranged between the first sealing cover and the second sealing cover, and a bearing inner end base is arranged at the top of the bearing ring. The vertical occupied space of the rotating shaft and the bearing can be effectively reduced, high-speed rotation control over the dust removal brush is achieved through cooperation of the motor and the rotating shaft, the sealing covers are arranged at the connecting positions of the bottom of the bearing, and the special structures of the edges of the sealing covers and connecting assemblies of the bearing are arranged in a sealed mode. No gap exists at the bottom of the bearing and the contact end of the bearing and the rotating shaft, and negative effects of environmental pollutants on the bearing are effectively prevented.

A flexible thin-wall crossed roller bearing multi-target parameter optimization method relates to the technical field of bearing design, and comprises the following steps: 1, establishing a parameterized system model containing a shaft system, a thin-wall crossed roller bearing and a box body assembly relation, the bearing model being determined by geometric and assembly parameters; 2, carrying out finite element modeling on the inner / outer ring of the bearing, and carrying out polycondensation on the degree of freedom of an interface to obtain an equivalent stiffness matrix; 3, inputting working conditions and material parameters, and setting a design variable feasible region and constraints; 4, coupling a mapping matrix to solve load distribution, calculating the maximum contact stress and the life damage rate, and constructing a dual-objective optimization model; 5, performing test design to obtain response data, and performing multi-target algorithm iterative optimization to obtain a Pareto optimal solution set; and 6, screening the solution set, and outputting a structure parameter combination meeting the requirement. The method can solve the problems that in the prior art, it is difficult to consider calculation efficiency and ferrule flexibility effect precision, and it is difficult to conduct rapid iterative optimization on roller load distribution and life / contact stress indexes.

The utility model discloses a material quantitative feeding device in the technical field of material feeding equipment, which comprises a rack, a stock bin is arranged above the rack, the stock bin is supported and mounted on the rack through a weighing sensor, and an electric control valve is arranged at a discharge port at the lower end of the stock bin. A buffer hopper, a star-shaped feeder, a flexible connecting pipe and an auger mechanism which are sequentially communicated and mounted are arranged below the stock bin; the weighing sensor, the electric control valve, the star feeder and the auger mechanism are electrically connected with the control processor unit; the stock bin adopts a weighing independent bearing type design, and a nesting gap is kept between the lower end of the stock bin and a downstream component, so that the weighing sensor can more accurately weigh the real-time weight of the stock bin, and the weighing error is reduced; and according to the feeding frequency required by the auger mechanism, the star-shaped feeder is controlled to perform batch and quantitative feeding, so that the problems of material blockage and the like caused by one-time discharging overload are avoided.

The present invention relates to an angular contact bearing friction torque testing machine and a measurement method based on a magnetic levitation bearing. The testing machine includes a testing machine main body, a magnetic levitation bearing system, a variable frequency speed regulation system, and a test monitoring system. The magnetic levitation bearing system is used to control the axial floating of the main shaft, and the variable frequency speed regulation system is used to drive the main shaft to rotate. One end of the main shaft connected to the test bearing is provided with an upper clearance adjusting pad and an upper compression nut that can move with the main shaft. An upper collision gasket is arranged between the upper compression nut and the upper clearance adjusting pad. A second adjustment clearance is left between the inner ring of the test bearing and the outer cylindrical surface of the upper clearance adjusting pad, and a third adjustment clearance is provided between one end of the inner ring and the upper clearance adjusting pad. The other end of the inner ring is in contact with the upper collision gasket for transmission or separated to form a first adjustment clearance. The test monitoring system is used to monitor the rotational speed of the inner ring and the parking time. The accurate friction torque of the test bearing can be calculated based on the rotational speed and parking time of the inner ring, providing a theoretical basis for bearing design and process improvement.

The application discloses a shaftless silent pump with an integrated rotor, which comprises a primary volute assembly, a front bearing assembly, a stator component, a double-stage rotor component, a secondary volute assembly and a rear bearing assembly. The stator component is composed of a stator shell, a stator core and front and rear flanges; the rotor component is composed of a rotor core, primary and secondary impellers and a rotor core pressing plate into an integrated structure, the primary and secondary impellers are arranged back to back on both sides of the motor, and the front and rear bearing assemblies are respectively located on the inlet sides of the primary and secondary impellers and are installed in the primary and secondary volutes. The integrated structure of the two-stage impellers back to back and the rotor core effectively improves the overall rigidity and dynamic balance of the rotor, the front and rear bearings are respectively designed on the inlet sides of the two-stage impellers, which facilitates the overall assembly and disassembly of the pump, the lengthened impeller inlet section and the increased bearing design play different roles in the pump inlet flow state, the balance of axial force and vibration noise, and the silent effect of the product is realized.

To provide a bearing which is compact along an axial direction, and preferably withstands a large load.SOLUTION: The present disclosure provides a bearing comprising an upper housing having a radial upper flange with an upper recess, a lower housing having a radial lower flange with a lower recess, an upper ring disposed in the upper recess and having an upper raceway, a lower ring disposed in the lower recess and having a lower raceway, and rolling elements disposed between the upper raceway and the lower raceway. The present disclosure adopts an unconventional bearing design, which not only realizes a compact bearing structure in the axial direction without sacrificing the load-bearing capacity of the bearing, but also provides a more optimal load-bearing performance along the axial and radial directions.SELECTED DRAWING: Figure 1

The invention relates to the field of parking equipment, and discloses a suspension type underground three-dimensional parking garage which comprises a shaft (11), a suspension bearing system, a traction chain (31) and a driving system (5), the suspension bearing system comprises a front main cross beam (21) and a rear main cross beam (22) which are fixed to the top of the shaft (11), and an upper portal frame system (23) fixed to the upper portion of the front main cross beam and the upper portion of the rear main cross beam; a chain bearing plate (24) is arranged on the upper portal frame system; the top end of the traction chain (31) is arranged to be higher than the ground so as to allow the automobile (100) to pass through the space surrounded by the traction chain (31), and the top end of the traction chain is hung on a chain force bearing plate (24). According to the suspension type underground three-dimensional parking garage, the front main cross beam and the rear main cross beam which are fixed to the top of a shaft serve as main bearing foundations, a traction chain is hung through the suspension bearing system comprising the upper portal frame system and the chain bearing plate, and a brand new suspension type bearing design structure is provided.

The utility model discloses a truck child-mother sliding door facilitating cigarette order cigarette packet operation, and belongs to the technical field of logistics transportation. The device comprises a child door and a mother door hinged to the tail of a compartment and a sliding door system on the mother door, the child door and the mother door are of a split structure, the child door and the mother door are independently opened and closed through hinges and are dynamically locked in cooperation with a lock pin and an electric magnet, and double guarantees of local flexible opening and transportation safety are achieved. A door opening is formed in the middle of the mother door, the sliding door is driven by a sliding groove and a toothed plate guide mechanism and a rotating motor, and electric or manual left-right sliding control is achieved. The overturning type storage rack is integrated on the outer side of the main door, forms a temporary operation platform after being unfolded and is fixed through the supporting plate and the rotary clamping plate, and handover of cigarette packet orders is facilitated. Through the split opening and closing, intelligent translation and modular bearing design, the problems that a traditional cargo door is large in occupied space, low in operation efficiency and potential safety hazards are solved, the loading and unloading efficiency and safety are remarkably improved, and the intelligent door is suitable for efficient distribution and submission scenes of cigarette logistics.