30results about How to "Improve the ability to resist instability" patented technology

The invention discloses a multilayer grating bearing cylinder and a preparation method thereof. The multilayer grating bearing cylinder is formed by nesting at least two single-layer grating cylinders, and the densities of the meshes of the adjacent single-layer grating cylinders are different. The preparation method for the multilayer grating bearing cylinder made from a composite material comprises the following steps: producing a wood pattern for casting a soft mode, producing a silicon rubber soft mode, assembling a mould, winding the soft mode in an assistance manner, carrying out vacuum bag moulding, demoulding and carrying out after-treatment, and integrally moulding the multilayer grating bearing cylinder; or preparing the single-layer grating cylinders according to the steps, and then assembling the single-layer grating cylinders into the multilayer grating bearing cylinder. The preparation method for the multilayer grating bearing cylinder made from metal or engineering plastic comprises the following steps: preparing a casting mould for the disassembly components of the single-layer grating cylinders, melting and casting, welding, and then assembling the single-layer grating cylinders into the multilayer grating bearing cylinder; or moulding in one step by a 3D printing technology. The multilayer grating bearing cylinder has the characteristics of good structural stability, light mass, high mechanical properties, difficulty of structural overall buckling instability, simple and practicable preparation method, and low cost.

The invention provides a crane and a super hoisting device thereof. The super hoisting device comprises a base, a guide part, an oil cylinder, masts and a connecting rod, wherein the base is connected with a crane arm of the crane; one end of the guide part is connected with the base, and the guide part comprises an accommodating cavity and guide grooves arranged at two sides of the accommodatingcavity; the oil cylinder is arranged in the accommodating cavity, and a first end of the oil cylinder is connected with the base; first ends of the masts are pivotably connected with the base; and a first end of the connecting rod is pivotably connected with the masts, and a second end of the connecting rod is pivotably connected with a second end of the oil cylinder through the guide grooves. According to the invention, the adjustment for the opening angle of the masts can be realized through the guide part and the oil cylinder arranged in the accommodating cavity of the guide part, thus theinstability-resisting capability of the crane arm is improved.

The invention discloses an inner truss type steel tube concrete L-shaped column and a construction method thereof. The inner truss type steel tube concrete L-shaped column comprises a wrapping steel tube, filling concrete and an inner truss; the inner truss comprises T-shaped steel, inner truss subunits and T-shaped steel web lacing bars; the inner truss subunits are formed by welding the T-shaped steel; the T-shaped steel web lacing bars are longitudinally welded in a T-shaped steel web and the inner truss subunits along the T-shaped steel in a stacked manner; the T-shaped steel and the inner truss subunits are positioned at edges and corners of a quadrangle; the cross section of the wrapping steel tube is inversely L-shaped or n-shaped; and the wrapping steel tube is fixedly welded with flange plates of the T-shaped steel. The inner truss is tensioned at a corner of a special-shaped steel tube, so that effective width of a steel plate is reduced, a fulcrum is provided for deformation of the steel plate out of a plane, anti-unsteady capability of the steel plate can be improved, a hooping effect of the column is improved, and the bearing capacity of a steel tube concrete special-shaped column is improved obviously.

The invention is a diffusion welding multilayer structure diaphragm capsule, belonging to the field of diaphragm capsule manufacturing. By adopting the methods of diffusion welding, machining and shaping, the manufacturing of diaphragm capsule in the invention can be realized. The main procedures include thin wall blank preparation, surface cleaning, surface modified treatment, welding-stopping treatment, diffusion welding, machining, shaping and the like. Compared with the multilayer structure diaphragm capsule manufactured by other methods, the multilayer structure diaphragm capsule manufactured by the invention has the advantages of fine fatigue property (above 1 million times), strong pressurization performance, adjustable rigidity, high compression ratio (higher than 80%), capability of micromation of inner holes, high precision of geometric dimensions, strong destabilization resistance, precise and controllable weldingline profile, adjustable width of weldingline and the like. By using the invention, the diaphragm capsule in the shape of circle, square and other shapes can be manufactured, and can serve as a compensation element of displacement and angle in hydraulic, barometric, transferring pipeline installation, an elastic compensation element and a pore damping element as well as a measuring element for a manometer and an altimeter; besides, the diaphragm capsule can be also used as a heat transferring finned tube for air conditioning, refrigeration and other devices as well as a metal capsule of separating gas or liquid for an accumulator and a storage box. The invention can provide multilayer structure diaphragm capsule products with fine performance for related industries.

The invention discloses a repairable multistage energy dissipation dry-type mixed fabricated type concrete shear wall. High-strength steel pipes are embedded in prefabricated concrete shear wall edgecomponents and are filled with high-strength concrete; the concrete shear wall edge components are connected through multistage energy dissipation pieces, the multistage energy dissipation pieces areconnected with the pre-buried high-strength steel pipes through end plate bolts, and middles of concrete shear wall bodies are connected through post-tensioning no-bonding prestress thread rebars; andthe multistage energy dissipation pieces are composed of top plates, bottom plates, steel pipe concrete bar bodies provided with constraint steel pipes, connecting plates and energy dissipation steelplates provided with diagonal stiffening ribs, only the energy dissipation steel plates and the connecting plates are connected through high-strength bolts, and other rod pieces are connected throughwelding. According to the repairable multistage energy dissipation dry-type mixed fabricated type concrete shear wall, dry-type connecting without cast-in-place concrete or grouting construction is achieved, meanwhile, the repairable multistage energy dissipation mixed fabricated type concrete shear wall is built, the working mechanism is clear, anti-seismic performance is good, the technical economic benefits are remarkable, and the repairable multistage energy dissipation dry-type mixed fabricated type concrete shear wall is especially suitable for being applied and promoted in an earthquake fortification area.

The invention relates to a marine composite superstructure bulkhead, which comprises a protective sandwich structure and a reinforcing structure. The protective sandwich structure comprises a lower-layer skin, an ultra-high molecular weight polyethylene armor plate, a PVC foam layer and an upper-layer skin, which are sequentially arranged from bottom to top, and all layers are bonded into a wholethrough an adhesive. The reinforcing structure comprises a bottom glass fiber reinforced plastic layer, a surface glass fiber reinforced plastic layer, PVC foam reinforced ribs and a glass fiber reinforced skin. The bottom glass fiber reinforced plastic layer is laid on the outer surface of the lower-layer skin of the protective sandwich structure; the surface glass fiber reinforced plastic layeris laid on the outer surface of the upper-layer skin, the PVC foam reinforced ribs are installed on the outer surface of the surface glass fiber reinforced plastic layer, and the glass fiber reinforced skin wraps the surfaces of the PVC foam reinforced ribs. The protective sandwich structure and the reinforcing structure are formed by adopting a vacuum flow guide integrated forming process. The marine composite superstructure bulkhead can meet the requirement on the impact load of splashed water spray, penetration of cubic fragments with a speed of 100-1500 m/s and a mass of 1-20 g can be defended, and the electromagnetic stealth performance is: the reflectivity within a range of 2-8 GHz is lower than -10 dB, and the reflectivity within the range of 8-18 GHz is lower than -18 dB.

The invention relates to a method and a tool for checking the forming quality of a cementing surface of a hyperboloid variable-thickness aluminum honeycomb. The method comprises the following steps: laying a lower skin on a cementing mold; laying a lower plate-core verification film on the lower skin; laying lower woven cloth along the surface of the outer contour of the lower plate-core verification film, laying upper woven cloth on the cementing area of a rear edge strip, a first rib, a second rib, a beam and an upper skin, laying an upper plate-core verification film along the surface of the outer contour of the upper woven cloth, laying the upper skin on the upper plate-core verification film, carrying out vacuum packaging on the whole aluminum honeycomb structural part, putting the aluminum honeycomb structural part into an autoclave, after high-temperature pressurization for a period of time, opening the autoclave, taking out the honeycomb structural part, and separating out the upper plate-core verification film and the lower plate-core verification film; observing the depth degree of extrusion traces on the upper plate-core verification film and the lower plate-core verification film to verify the forming quality of the cementing surface of the aluminum honeycomb, the situation that the skin is damaged due to instability and slippage of the aluminum honeycomb is prevented, and the matching precision and verification comprehensiveness are improved.

The invention discloses a vibration active control type axial plunger pump with magnetic bearings. The vibration active control type axial plunger pump with the magnetic bearing comprises a shell, a stepped driving shaft, a swash plate, a plunger moving assembly, a cylinder body, a radial cylinder body magnetic control outer ring, a first radial permanent magnet bearing, a second radial permanentmagnet bearing and an axial positioning magnetic control bearing, wherein the radial cylinder body magnetic control outer ring acquires a vibration signal in real time through a displacement sensor, the radial cylinder body magnetic control outer ring is adjusted according to the vibration, the first radial permanent magnet bearing and the second radial permanent magnet bearing realize a suspension state of the stepped driving shaft through the principle of the same magnetic repulsion, and the axial positioning magnetic control bearing regulates and controls electromagnetic force by controlling the magnitude of current so as to ensure the axial positioning of the driving shaft. According to the vibration active control type axial plunger pump with the magnetic bearings and the control method thereof, the vibration of the cylinder body is monitored and controlled in real time while the driving shaft is suspended, friction among the bearings and the driving shaft is reduced, the dynamicstability of the cylinder body is improved, and the stability and reliability of the axial plunger pump are improved.

A local strength-varying design method for automobile parts includes the steps of: 1) determining the impact direction of an automobile part and calculating the cross section equivalent width, material thickness and base material yield strength, which are vertical to the impact direction, of the part; 2) determining whether the part has a rib being vertical to the impact direction or not, if true,performing laser quenching to the rib; 3) if the part has a rib in parallel with the impact direction, reinforcing the rib, or performing 360-degree laser quenching in a cross section, being verticalto the impact direction, of the part, thus forming a plurality of strength-varying rings, which are distributed on the part at intervals; 4) performing entire tempering thermal treatment to the part.The method can induce elastic-plastic buckling deformation of the part and also improve energy absorption level and anti-instable capability of the part. In the method, an inner-concave-outer-convexperiodical deformation mode is replaced by an all-concave deformation mode, so that axial crushing plastic deformation is more stable.

The invention discloses a stiffening bearing type outer-frame-free construction platform for a residential building and a construction method. The stiffening bearing type outer-frame-free constructionplatform is mainly composed of a triangular truss bearing structure, high-strength bolts, fixing sleeves, angle steel bearings and triangular stiffening ribs. The protection construction platform isflexible to assemble and disassemble and high in assembling degree, the frame type scaffold can be inserted into the round steel pipe connecting pieces in a construction site, the structure is installed by screwing down the bolts, then the whole protection construction platform is hoisted to a preset position to be inserted into the fixing sleeve, the overall consumable amount is reduced, and safety is high. Meanwhile, the protection construction platform is clear in stress, the bearing capacity is remarkably improved, and the bolt sleeve is creatively welded to the hole opening position of the steel pipe to perform stiffening treatment on the local part of the steel pipe. The construction protection platform is simple in structure assembly, high in construction efficiency, high in safetyand low in construction cost, and is a novel fabricated outer-frame-free protection construction platform suitable for a civil residential building of a current shear wall system.

The invention discloses process equipment used for large-size bowl-shaped structural part preforming, and belongs to the technical field of sheet metal forming process equipment. The process equipmentcomprises a hydraulic machine tool, and further comprises a convex die holder, a blank holder, a convex die, a concave die and a material returning device. An upper platform allowing the convex die holder to be fixedly mounted and a lower platform allowing the concave die to be fixedly mounted are arranged on the hydraulic machine tool. The material returning device is arranged in the concave die, the blank holder is arranged beside the convex die holder, an ejector rod for providing pressure for the blank holder is arranged at the top of the blank holder, and a material returning ejector plate used for ejecting a preformed structural part on the material returning device is arranged at the bottom of the material returning device. By means of drawing ribs arranged on the blank holder andthe concave die, flowing materials are delayed to fully release deformation stress, the forming gap between the concave die and the convex die is set to be several times of the thickness of the materials, and wrinkling and cracking of blanks in the forming process can be avoided.

The invention relates to the technical field of passive safety of rail transit vehicles, and in particular relates to a contact integrated buffering and energy absorbing device for a rail transit vehicle. The device comprises a first energy-absorbing mounting seat, a second energy-absorbing mounting seat, a first-stage guide rod, a second-stage guide rod and an energy-absorbing body. A plurality of airbags are evenly arranged on the side wall of the first-stage guide rod, the second-stage guide rod is sleeved with the energy-absorbing body. The guide rods, the airbags and the energy-absorbing mounting seats are matched to realize first-stage buffering and energy absorption, the energy-absorbing body, the second-stage guide rod, the energy-absorbing mounting seats and a steering connecting structure are matched to realize second-stage crushing energy absorption, and meanwhile, the six-degree-of-freedom characteristic of a joint ball bearing is ingeniously utilized; the function that a middle energy-absorbing module moves along with the vehicle in the horizontal direction and the vertical direction is achieved, the longitudinal bearing capacity of the device is effectively enhanced, the anti-instability capacity of the middle vehicle in the train collision process is improved, and the buffering and energy-absorbing device has the advantages of being high in reliability, high in anti-instability capacity and capable of being repeatedly used.

A large-angle flexible laminated single-tooth or dual-tooth shaft coupler is composed of internal central hole for shaft, screw holes, external arcs, and femal arcs for single-tooth one or the male arcs and female arcs for dual-tooth one. Its advantages are large compensating angle, high stability and long service life.

The invention provides a reinforced composite material fold channel sandwich structure and a preparation method and application thereof, and relates to the technical field of composite materials. The coupling enhancement design of the foam and composite material fold channel sandwich structure is adopted, the structure is simple, and preparation is easy; according to the reinforced composite material corrugated channel sandwich structure, the anti-instability capacity of the corrugated core structure is improved in a foam filling mode, meanwhile, the bearing capacity of the reinforced composite material corrugated channel sandwich structure under the unit mass can be remarkably improved by means of the characteristic that foam is light, and the engineering application range and potential of the composite material sandwich structure are improved.