9712 results about "Bearing capacity" patented technology

The invention discloses a prescription of a wheeltrack lubricant additive, which is characterized by strong bearing capacity, high temperature resistance and long effective time upon one time coating, thereby solving the defect that factigue crack expansion of the wheeltrack is accelerated by traditional grease for the generation of oil wedge effect. The prescription comprises 1 percent-30 percent of metal powder, 3 percent-50 percent of high temperature solid lubricant material and 5 percent-50 percent of fatty acid by weight. The strip solid materials can be produced in virtue of other accessories by the prescription.

The invention relates to a construction method for bidirectional spiral expand pile and the bidirectional spiral closed expand bit. The construction method comprises drilling and expanding bore by the bidirectional spiral closed expand bit; pushing soil, which is obtained in drilling and expanding bore downwards, into the side wall of pile bore; the bidirectional spiral closed expand bit rotating upwards to drill and expand the bore again; pushing soil, which is obtained in drilling, expanding and lifting upwards, into the side wall of pile bore; starting the concrete pump to press the pile material into the pile bore while the bit is lifted. The bidirectional spiral closed expand bit comprises a connecting bar. At the lower of the connecting bar spiral expand body, closed expand body and dynamic sealing expand body are assembled on the connecting bar in the same axial line in turn from the bottom to the top or they are machined on the connecting bar together. The invention is provided with high loading capacity, small sedimentation quantity, better quality, low cost and smaller energy consumption so on.

A linear actuator has two half-shells, a motor housing, a motor installed in the motor housing, a guiding screw driven by the motor, a screw nut engaged with the guiding screw, an interior tube encircling the guiding screw and connected with the screw nut at one end thereof, a moveable exterior tube telescoping the interior tube therein, at least two ball bearings subject to radial and axial load, and fitting seat installed in the half-shells. The fitting seat has to bearing seats for mounting the ball bearings, such that the load capacity of the linear actuator is increased, while the application safety is enhanced.

The invention relates to a plugging agent during well drilling in oil and gas field, and particularly to a high efficient plugging agent for severe lost circulation. The components are, by weight: 18-25% of walnut shell powder, 8-10% of sawdust, 8-10% of cottonseeds, 10-15% of hull powder, 20-30% of active plugging agents, and 15-25% of elastic rubber granules, and the raw materials are mixed uniformly to obtain a high efficient plugging agent for well drilling. According to the invention, the fibrous plugging agent with granules is formed by mixing natural plant inert materials, a synergistic agent, and a reinforcing agent with a certain preparation ratio. The plugging agent of the invention has the advantages of wide covering area for leak stopping, high pressure bearing capacity, good plugging effect, high success rate for disposable leak stopping, simple on-site preparation process, and reliable and safe construction, which can achieve the purposes of reducing loss of lost circulation and saving comprehensive cost. The high efficient plugging agent of the invention is applicable to leak stopping operations under various lost circulation conditions with good leak stopping effect and high success rate, and is superior to other types of plugging agents.

The invention relates to a Y-shaped agitating pile drilling machine for reinforcing a soft land. A retracting oil jack drives three groups of agitating assemblies to move through a transmission rod A, a transmission rod B and a transmission rod C; a 120-degree angle is formed on a space by the three groups of the agitating assemblies; the section of a pile body formed by the Y-shaped agitating pile drilling machine is Y-shaped; the pile body of a Y-shaped agitating pile with the same volume is the pile body of the agitating pile, which has a circular section; and the bearing capability is greatly improved.

The present invention provides a prefabricated assembly type shear wall vertical slit connecting structure which comprises a left side shear wall, left side pre-embedded profile steel, a right side shear wall, right side pre-embedded profile steel, and a plurality of split bolts. The left side pre-embedded profile steel and the right side pre-embedded profile steel are disposed between the left side shear wall and the right side shear wall and have the same structure. The left side pre-embedded profile steel comprises a side plate, a front side plate and a rear side plate, the front side plate and the rear side plate are disposed at front and rear positions of the side plate, each of the front side plate and the rear side plate is inwardly provided with a groove, and the grooves are provided with a plurality of bolt holes. The split bolts are disposed in the bolt holes to lock and fix the left side pre-embedded profile steel and the right side pre-embedded profile steel. The present invention also provides a construction method of the prefabricated assembly type shear wall vertical slit connecting structure. The connecting structure is high in bearing capacity, high in stiffness, good in seismic ductility, excellent in integrity, convenient in construction and good in construction quality, and concrete is effectively restrained.

The present invention relates to a sound rated floor system for inhibiting sound transmission between floors. The system includes a corrugated steel deck; a first layer of cementitious material or board or sheet applied over the corrugated steel deck; a sound insulation mat or board applied over the first layer; a second layer of cementitious material applied over the sound insulation mat or board. The floor system has an IIC rating of at least 25 and the corrugated steel deck provides at least 50 percent of the ultimate load carrying capacity under static and impact loading of the floor system with a floor deflection of at most 1/360 of the floor span.

The invention discloses a method for self-lubricating treatment of laser micro-texture of bearings. The invention comprises the following steps: firstly performing laser micro-processing technology of micro recessed cavities or micro grooves on a bearing surface, and then performing molding and bonding technology by a self-lubricating composite material on the bearing surface; the self-lubricating composite material comprises the following components by mass: 10-15% of polyimide (PI); 8-13% of graphite powder; 40-50% of polytetrafluoroethylene; 25-29% of MoS2; 0-5% of additives. By the self-lubricating treatment of laser micro-texture of a bearing, the invention guarantees the bearing capacity and the fitting accuracy of the bearing, realizes an optimized distribution of the lubricant on the bearing working surface, and improves comprehensive performance of antifriction and wear resistance of the bearing under complicated working conditions.

The invention relates to steel tube-I-beam combination steel tube concrete special-shaped columns, which comprises steel tubes, I-beams and concrete poured inside the special-shaped columns. The steel tubes and the I-beams are welded together to compose the special-shaped columns with different sections. The whole sections are separated through the steel tubes and the I-beams, then the concrete is filled in separation spaces of the steel tubes and the I-beams, the steel tubes can be made by welding or rolling, and the I-beams can be made by welding or rolling. The steel tube-I-beam combination steel tube concrete special-shaped columns have the advantages that inside corner steel tube walls and I-beam flange steel plates are communicated with each other so as to overcome the defect that force delivery of inside corner portions of other steel tube concrete special-shaped columns is unclear, and whole working capacity of steel tube concrete special-shaped columns is improved. The steel tubes are placed at the edges and at corner portions of the sections so as to improve restrain capacity of the special-shaped columns. The steel tubes and the I-beams separate the concrete of the special-shaped columns, width-to-thickness ratio of the steel plates is reduced, bearing capacity and shock-resistance are improved, production and assembly of the special-shaped columns are modularized, and simultaneously construction speed is fast.

The invention discloses a steel-concrete composite beam adopting a corrugated steel web, which relates to a corrugated steel web composite beam capable of being applicable to highway bridges and railway bridges. The beam comprises a top flange concrete composite plate, a corrugated steel web plate, a top flange steel plate, a box beam bottom plate and male pin connecting pieces, wherein the top flange comprises a precast concrete slab and a cast-in-place concrete layer; and the top flange concrete composite plate is connected with the top flange steel plate into a whole through the male pin connecting pieces welded on the top flange steel plate. By adopting the structure, the problems that the site workload and the construction difficulty for casting a bottom flange concrete slab of a traditional corrugated steel web composite beam are large, the construction quality is difficult to guarantee and the like are overcome on the premise that the quantity of steel is hardly increased, meanwhile, the tensile property of the steel plate is fully played, the bearing capacity, the rigidity and the cracking resistance of the structure are improved, and the durability of the structure is improved, therefore, the corrugated steel web composite beam has the advantages of simple structure, reasonable stress, quick and convenient construction, and good technical and economic benefits.

The invention discloses a small high-speed five-axis linkage machine tool, which comprises a foundation structure, a spindle box component and a cradle type worktable. The spindle box component is supported on the foundation structure, and a crossbeam with a frame-shaped structure is arranged on two upright columns to form a bridge-type portal structure. The torque bearing capacity of the crossbeam is improved, the small high-speed five-axis linkage machine tool has all advantages of a five-axis linkage machine tool in the prior art, and carries identical machining reacting force, the volume of a structural part is reduced, and the weight of the structural part is greatly lightened; a spindle box is positioned between two transverse rods of the frame-shaped crossbeam, overturning moment is eliminated, and the stability of the machine tool can be guaranteed; in addition, sizes of various components are greatly reduced on the premise of identical machining capacity, and the stroke of the machine tool can be large in the design; and by the aid of the structure, the machining precision is greatly improved, the machining range is greatly expanded, better dynamic characteristics and higher feeding speed and higher cutting speed can be realized, cutting and machining time is greatly shortened, better surface machining quality is obtained, and machining efficiency is enhanced.

The present invention relates to a bridge field static load test evaluation method, which is mainly a method for evaluating the bearing capacity and adaptation performance of a bridge by means of a field static load test. The method comprises the following steps: (1) determining specific content and method for collecting relevant data for early stage preparation work; (2) establishing a reasonable and accurate bridge structure finite element model according to the collected data; (3) calculating and analyzing a result according to an endogenous force and a stress of the bridge under dead and live loads, and determining theoretical force bearing safety and live load force bearing characteristics; (4) in combination with a traditional key section of the bridge, determining a bridge test section and completing static load test solution designing; (5) performing the field static test for the bridge and processing the test data; (6) studying an evaluation interval corresponding to a preset test evaluation indicator; and (7) making a reasonable and comprehensive assessment on the structural performance of the bridge. The evaluation method and indicator according to the present invention can more effectively indicate the practical bearing capacity and applicability of the bridge in a refined manner, and improving the reasonability and accuracy of the evaluation result.

The present invention relates to railway ballast bed accessory, and is especially one kind of elastic bearing plate for use under ballast bed of railway. The elastic bearing plate includes antiwear elastic layers(s) and one buffering elastic body below or inside the antiwear elastic layers(s). The buffering elastic body has relatively lower area rigidity or elastic modulus. The elastic bearing plate has high elasticity, high bearing capacity, high durability, long service life, excellent buffering effect, and capacity of lowering vibration and noise greatly. It may be applied widely under ballast bed of railway for buffering and damping.

The invention discloses a floating auxiliary roller type overrun clutch which comprises an outer ring, an inner ring, rolling bodies and auxiliary rollers, wherein engagement spaces used for being engaged with or separated from the rolling bodies are formed between the outer ring and the inner ring; the auxiliary rollers are parallel to an axial line of the overrun clutch and are spaced from the rolling bodies; and the auxiliary rollers are arranged between the rolling bodies in such a way that the auxiliary rollers can move in a circumferential direction of the overrun clutch. According to the floating auxiliary roller type overrun clutch, the processing of a limiting seat is avoided, the processing process is simplified, the working efficiency is improved, and the processing cost is reduced; as the auxiliary roller structure is adopted, the axial length of the overrun clutch and the rolling bodies can be theoretically infinitely prolonged, the engagement length is prolonged, the bearing capacity of the overrun clutch is increased, the radial size of the overrun clutch under higher bearing capacity is reduced, and the service life of the overrun clutch is prolonged; and meanwhile, the probability of imbalance caused by application of a pretension force to point contact of each roller in the prior art is removed, thereby enabling each roller to keep parallel to the axial line of the inner ring.

The invention relates to a helical involute gear and a processing method thereof. The helical involute gear is characterized in that a tooth surface molded line is a helical involute which is a curve spread by a rack type line straightly moving along the pitch circle tangent line and pure-rolling with a gear pitch circle. The helical involute gear has clear and easy drive principle, can ensure the drive continuity and the drive uniformity, and can realize surface meshing with large meshing area so that the bearing capacity is strong; the helical involute gear has long meshing line and large superposition coefficient, especially, an inclined helical involute conical gear is easy to implement speed reduction at high speed ratio. The helical involute conical gear can realize the expansion processing, thereby having high processing accuracy, low processing cost and high processing tooth surface hardness, improving the motion stability of the gear and the bearing capacity, and prolonging the service life. Meanwhile, processing equipment required by the helical involute gear can be conveniently processed by utilizing the method, thereby solving the difficulties of large processing difficulty and high cost of a gear drive pair with intersecting axes.

A method for constructing pipe piles while drilling for building or bridge foundations. The construction steps are to cover high-strength prestressed concrete pipes or steel pipes with drill pipes on the ground first, and install impactors and reaming retractable drill bits at the front ends of the drill pipes. , Follow the pipe while drilling, follow the pipe retaining wall, drill to the design elevation, stop drilling, withdraw from the reaming to shrink the drill bit, use the mud pump to clean the mud and sediment, pour concrete into the pipe, and simultaneously inject pressure grout to the outside of the pipe wall , stop when concrete and grout reach the ground; the object of the invention is to propose a construction method with fast construction speed, reliable quality, less material consumption, high bearing capacity of piles, mechanized operation, and environmental protection. In the construction method of bored cast-in-place piles, the use of mud retaining walls pollutes the environment, the hole is easy to collapse during the drilling process, the quality of concrete pouring is unstable, and the prestressed pipe piles are easy to cause the soil to rise. The strength of the pile body constructed by the invention is high. , There is no sediment at the bottom of the pile, and the pile end is completely rock-socketed, which can reach more than 2 times the bearing capacity of the same diameter bored pile.

A coupled four-freedom-degree parallel connection vibration isolation platform mainly comprises an upper platform, a lower platform, four main part branches and a middle constraint branch, wherein the four main part branches are identical in structure and used for connecting the upper platform and the lower platform. The tails of actuators of the main part branches are connected with the lower platform through universal joints, telescopic rods of the actuators are connected with the upper platform through ball joints, one end of a lower connecting rod in the middle constraint branch is connected with the lower platform through a universal joint, the other end of the lower connecting rod is connected with an upper connecting rod in a bell socket mode to form a sliding pair, namely the upper connecting rod can expand and retract in the lower connecting rod, the upper connecting rod of the sliding pair is sleeved with a spring, the other end of the upper connecting rod is connected with the upper platform through a rotating pair, and the axis of the rotating pair is parallel to one axis of the universal joint in the middle constraint branch. Lower hinge points of the four main part branches are symmetrically arranged in a square shape, upper hinge points are arranged in a trapezoid shape, and the trapezoid is symmetrical about the axis of a rotating pair of the middle constraint branch. The coupled four-freedom-degree parallel connection vibration isolation platform is simple in structure, large in bearing capacity and good in dynamic response characteristic.

The invention discloses a heavy-load precise double-arm manipulator with arms cooperating with each other in a space. The manipulator comprises a linkage guide rail assembly, the load-bearing mechanical arm used for bearing weights and the assistant positioning mechanical arm used for guaranteeing workpiece positioning precision. Because the load-bearing mechanical arm and the assistant positioning mechanical arm can cooperate with each other in the space, it is guaranteed that the whole manipulator structure has high load bearing capacity and also has high positioning precision, the problem of contradiction between the load bearing capacity and precision of existing manipulators is solved, and the requirements for clamping of workpieces with different shapes, high surface precision, high efficiency and high safety performance are met.

The invention discloses a flying-shear main-transmission gearwheel steel and a preparation method thereof. The flying-shear main-transmission gearwheel steel comprises the following elements in percentage by mass: 0.10-0.20% of C, 2.00-3.00% of Cr, 2.50-3.50% of Ni, 0.4-1.00% of Mo, 0.10-0.40% of Si, 0.40-1.00% of Mn, at most 0.25% of Cu, at most 0.1% of Al, at most 0.020% of P, at most 0.015% ofS, at most 30ppm of O, at most 100ppm of N and at most 2ppm of H. The preparation method comprises the following steps: (1) smelting according to the percentage by mass to obtain a forging stock; (2)forging; (3) carrying out normalizing heat treatment; (4) carrying out gear hobbing; (5) carrying out surface carburization quenching heat treatment; and (6) carrying out gear grinding. The inventionenhances the bearing capacity and reliability of the gearwheel, and satisfies the production demands of high-carbon high-alloy steel and enhanced specifications, thereby having wide popularization and application prospects.

Various embodiments of reduced-size vehicles such as all-terrain vehicles (ATVs) and utility vehicles (UVs) are disclosed herein. In at least some embodiments, the vehicles include frames that are wider near the front and rear sections of the vehicles than within the mid-sections of the vehicles. This, in combination with the use of shock-absorbers that are substantially vertically oriented, allows for the opening-up of large interior cavities within the front and rear sections of the vehicles within which can be positioned large front and rear internal compartments that can provide storage/carrying capacity as well as added buoyancy for the vehicle, among other things. Also, in at least some embodiments, the vehicles can include special cooling and/or exhaust systems having components that are positioned substantially within the mid-sections of the vehicles, thus further increasing the amounts of space available for the cavities/compartments within the front and rear sections of the vehicles.

The invention discloses a 900MPa high-strength steel preheating-free combined welding method. 700-800 MPa low-hydrogen type high-tenacity shielded metal arc welding is adopted for backing welding, then a 900MPa high-tenacity solid wire is matched with Ar+CO2 mixed gas shielded welding for implementing filling welding, and a 800MPa flux-cored wire is matched with CO2 gas shielded welding for cosmetic welding. A crack-free welding joint can be obtained by welding 900MPa high-strength steel through adopting a preheating-free and postweld heat treatment free combined welding process, and a joint region is smooth and clean, and can meet operating requirements on a high-strength steel welding structure for higher bearing capacity because the room temperature tensile strength of weld metal is more than 860MPa and the damping power of a V-shaped notch of the weld metal with the test temperature of 0 DEG C is more than 90J; and meanwhile, the method has welding cost reduced by about 25 percent, simple and convenient operation and easy popularization.

The invention provides a three-dimensional isolation device, which belongs to the field of the vibration control of a civil engineering structure. The three-dimensional isolation device is characterized by mainly comprising a lead-laminated rubber shock isolator, a combined disc spring, a guiding shaft of the combined disc spring, a diamond steel plate damper and the like, wherein the lead-laminated rubber shock isolator is positioned at the lower part of the device, and a lower joint plate and a middle joint plate of the device are both fixed with a slide guide, a slide block and a crossed high-strength cable respectively; a fixed steel plate at the lower end of the guiding shaft of the disc spring is fixed on the middle joint plate by a bolt, the compound combined disc spring is sleeved on the guide shaft and the top end of the guide shaft is provided with an anti-pull baffle and an anti-pull bolt; and the diamond steel plate damper is positioned horizontally, and the two ends thereof are supported on a steel plate support bracket which is fixed on a fixed steel plate of the guiding shaft of the disc spring, and the middle of the diamond steel plate is fixed on an upper joint plate of the three-dimensional isolation device by a screw and a nut. The three-dimensional isolation device has enough vertical bearing force and provides proper vertical and horizontal rigidity and dampness; and key parts are connected reliably and horizontal limiting and vertical anti-pull measurements are provided.

The invention provides a laser dynamic deflection survey vehicle. The survey vehicle comprises a mobile measuring table, a measuring cross beam, a running wheel, a velocity measuring wheel, an accelerometer and a data acquiring and processing device. The laser dynamic deflection survey vehicle provided by the invention has the following advantages: according to the laser Doppler velocity measurement principle and the inertia measurement principle, during the driving process of the vehicle at a normal traffic velocity (15-80km/h), a plurality of laser Doppler vibration meters arranged in the front of loading wheels of the vehicle synchronously measure the relative movement velocity of various measuring points on a road surface; the instantaneous deflection deformation velocity of the road surface is obtained through inertia compensation calculation; and a dynamic deflection value of the road surface is obtained through inversion by utilizing a road layered elastic mechanical model and used for general investigation and assessment of the bearing capacity of a road network.

A soft soil foundation reinforcing method includes the following steps: backfilling a medium coarse sand cushion on the site surface, inserting and beating a plastic drainage board, setting up drainage systema in vertical and horizontal directions, burying a pore water pressure layered settlement and lateral deformation observation system; laying a vacuum membrane, installing a vacuum sewerage system, vacuum preloading, filling and rolling when the pressure under the vacuum membrane reaches 80KPa and becomes stable; vacuum-heap combined preloading, starting to dynamic compact when an obvious inflexion appears and the settlement curve tends to be gentle inclined and the accumulated settlement volume reaches 60-70% of the estimated settlement volume; when the settlement curve tends to be stable, stopping vacuum preloading and fully compacting. The method has the advantages of short construction period, low cost, large bearing capacity of the hard shell, and obviously reduced post-construction settlement and uneven sensing settlement, and has unique advantages over land reclamation projects in coastal areas such as Fujian, Zhejiang, Shandong and Liaoning Provinces around which a large amount of stonework material can be excavated and backfilled.

The modular aircraft system includes a single fuselage having a permanently installed empennage and plural sets of wing modules and engine modules, with each wing and engine module optimized for different flight conditions and missions. The fuselage and each of the modules are configured for rapid removal and installation of the modules to minimize downtime for the aircraft. Short wings having relatively low aspect ratio are provided for relatively high speed flight when great endurance and/or weight carrying capacity are not of great concern. Long wings having high aspect ratio are provided for longer range and endurance flights where speed is not absolutely vital. A medium span wing module is also provided. Turboprop, single turbojet, and dual turbojet engine modules are provided for installation depending upon mission requirements for any given flight. The aircraft is primarily adapted for use as an autonomously operated or remotely operated unmanned aerial vehicle.

The present invention discloses one kind of adaptive leak preventing and stopping agent for drilling fluid. The adaptive leak preventing and stopping agent consists of pre-cross linked polymer grain in 30-60 weight portions, plant fiber in 10-40 weight portions, olefin polymer in 10-20 weight portions and calcium carbonate in 5-20 weight portions. By means of the synergistic effect of the ingredients, the adaptive leak preventing and stopping agent bridges, links, fills and reinforces in the leak passage to form plugging layer, raise the pressure bearing capacity of the stratum and reach the aim of preventing and stopping leak. The adaptive leak preventing and stopping agent with elastic and deformable components is suitable for plugging pores and cracks in relative large range and can reach effective leak stopping.

The invention discloses an undersea suction anchor which comprises a main drum, a top face of the main barrel is sealed, a lower end of the main barrel is opened, and a main barrel drainage hole is arranged on the top face of the main drum. The undersea suction anchor is characterized in that a barrel skirt is movably sleeved on the main drum, the barrel skirt comprises a horizontal top face and a barrel-shaped lateral wall, a barrel skirt drainage hole is formed in the horizontal top face of the barrel skirt, a telescopic hook locating the barrel skirt at the upper portion of the main barrel is arranged on the barrel-shaped lateral wall at the upper portion of the main barrel, an anchor ring concentric with the main barrel is arranged at the upper end of the main barrel, anchor branches are evenly arranged on the anchor ring, one ends of the anchor branches are hinged to the anchor ring, and the other ends of the anchor branches are hinged to the barrel skirt through inclined support rods. The whole vertical section of the suction anchor is in an umbrella shape, in the sinking process of the anchor body, along with landing-on-seabed of the barrel skirt, the anchor branches are driven by the inclined support rods to be gradually opened, and after the main barrel sinking is finished, the anchor branches cling to the surface of the seabed in a horizontal extending mode. The undersea suction anchor can improve the integral stability of the suction anchor, increases pulling resistance and horizontal bearing force, and reinforces wave-corrosion-resistance performance.

The invention discloses a precession-type backfill grouting ground source thermal energy conversion precast pile device, which comprises a plurality of precession-type backfill grouting prefabricated screw piles respectively embedded into pile holes, wherein a vertical heat exchanger is embedded in each screw pile; the inlet end and the outlet end of each vertical heat exchanger respectively extend out of an opening at the upper end of the screw pile to be respectively connected with a horizontal liquid-feeding collecting pipe and a horizontal liquid outlet collecting pipe in a bearing platform or a cushion layer; centring brackets are arranged at an interval of 1-3 m along the length direction of each vertical heat exchanger; each precession-type backfill grouting prefabricated screw pile comprises a hollow pile core, wherein the bottom of the pile core is provided with a cone-shaped pile head; a screw blade is arranged on the position far away1-3m from the lower part of the outer wall of the pile core; and a post grouting reinforcing layer is poured between the middle upper part of the outer wall of the pile core and a pile hole wall. The precession-type backfill grouting ground source thermal energy conversion precast pile device comprises a plurality of precession-type backfill grouting prefabricated screw piles, and the vertical heat exchanger is embedded in each screw pile; the pile foundation construction and the ground source heat pump construction are integrated so as to avoid a drilling and pipe-laying program of a ground source heat pump system on the ground, greatly lower the front-end investment cost and save the land use area; and the post grouting reinforcing layer is poured between the middle upper part of the outer wall of the pile core and the pile hole wall so as to enlarge a heat conduction area, improve the heat conduction performance and simultaneously improve the pile body bearing capacity.

The invention relates to a shaft sealing device with magnetic fluids, which is characterized in that based on an existing shaft sealing device with magnetic fluids mainly comprising a rotating shaft, a non-magnetic metal shell, magnetic poles, a permanent magnet, the magnetic fluids and a rubber ring, sealing pole teeth made of soft magnetic materials are additionally arranged in sealing pole tooth grooves of the magnetic poles, a sealing pole tooth ring is sleeved on the rotating shaft, the inner diameter of the sealing pole tooth ring is 0.1-0.6mm larger than the diameter of the rotating shaft, the outer diameter of the sealing pole tooth ring is 0.1-0.3mm smaller than the inner diameter of each tooth groove, the thickness of the sealing pole tooth ring is 0.1-0.3mm smaller than the width of each tooth groove, the magnetic fluids are distributed in an annular sealing gap between the rotating shaft and the sealing pole tooth ring, and each magnetic pole comprises two half annular magnetic poles. The positions of the sealing pole teeth of the device can be changed radially along the rotating shaft to adjust coaxiality of the rotating shaft and the sealing pole teeth, uneven distribution of the annular sealing gap in the circumferential direction of the rotating shaft is decreased, reduction of the pressure bearing capacity of the device and abrasion of the rotating shaft and the sealing pole teeth are avoided, and the requirements of sealing components on machining and mounting precision are lowered.

The present invention discloses a smart balance wheel with a bolt-shaft structure, comprising a fixedly connected bearing and shaft system, a balance control and drive system, a safety control and prompt system and a charging system. The fixedly connected bearing and shaft system comprises a main frame and a shaft system. The main frame comprises a left frame and a right frame symmetric to each other and rotating relative to each other. The shaft system passes through the left and right frames to realize relative rotation. The balance control and drive system is located under the fixedly connected bearing and shaft system. The present invention uses a bolt-shaft structure and a closed dustproof structure, realizes fixing of the left and right main frames, increases connection strength and bearing capacity of the frame, improves safety of balancing, controlling and driving and improves the service life.