39results about How to "Improved stiffness properties" patented technology

Compositions comprising specific disodium hexahydrophthalate(HHPA) salts in combination with acid scavengers (such as organic calcium salts or dihydrotalcite complexes) that provide highly desirable and effective nucleating properties within polymer articles (such as polyolefins) are provided. Surprisingly, such a combination of HHPA salt and acid scavenger provides high crystallization temperatures, low haze, and / or high flexural modulus to the finished polymer product. Other sodium salt polymer nucleators (such as sodium benzoate) deleteriously react with calcium organic salt acid scavengers such that characteristically high crystallization temperatures are drastically reduced when in combination with calcium salts (such as calcium stearate). Also, sodium benzoate when combined with dihydrotalcite acid scavengers produce extremely high haze levels in the finished target polymer article, whereas the inventive compositions surprisingly reduce haze. The finished polymer articles comprising such an inventive composition are also contemplated within this invention.

This invention relates to an aluminum conductor composite core reinforced cable (ACCC) and method of manufacture. An ACCC cable having a composite core surrounded by at least one layer of aluminum conductor. The composite core comprises at least one longitudinally oriented substantially continuous reinforced fiber type in a thermosetting resin matrix having an operating temperature capability within the range of about 90 to about 230° C., at least 50% fiber volume fraction, a tensile strength in the range of about 160 to about 240 Ksi, a modulus of elasticity in the range of about 7 to about 30 Msi and a thermal expansion coefficient in the range of about 0 to about 6×10−6 m / m / C. According to the invention, a B-stage forming process may be used to form the composite core at improved speeds over pultrusion processes wherein the speeds ranges from about 9 ft / min to about 50 ft / min.

Provided is a container system adapted to withstand repeated impacts. The container system features a first container having a first container body and a second container having a second container body. The second container defines a second body height and a second body wall thickness. A body recess which is adapted to releasably engage the first container body of the first container is formed on the second container body and is extended along the second body height. The body recess defines at least one recess bottom corner having a recess bottom corner wall thickness which is at least identical to the second body wall thickness of the second container body. This specified bottom corner wall thickness of the body recess allows the second container to withstand the single impact or repeated impacts. Polyethylene, extrusion blow-moldable copolyester, polycarbonate, and clarified polypropylene may be used to fabricate the second container.

The invention discloses biology-based high-rigidity furan epoxy resin and a preparation method thereof, and belongs to the technical field of polymer compounds. The preparation method comprises the following concrete steps: subjecting an obtained furan epoxy resin monomer and different types of curing agents to hot melting, then carrying out uniform mixing, and carrying out mold injection, heating and curing so as to obtain furan epoxy resin with excellent energy storage performance, wherein the furan epoxy resin reaches a phase transition temperature up to 216 DEG C and a rigidity up to 4.1 GPa. The method provided by the invention has the following advantages: through direct adoption of a bulk curing method, simple operation flow and short curing time are achieved, and an obtained biological epoxy resin polymer material has excellent performance.

The invention discloses an assembling method for a low-pressure turbine shaft-disc assembly of an aero-engine. The assembling method comprises the following steps that workpieces are installed, the position and the posture of a turbine shaft are adjusted; the turbine shaft butts joint and is pre-installed; an indexable tightening system is fed to a front end operation area; a tightening shaft is tightened; and the indexable tightening system returns back. According to the assembling method for the low-pressure turbine shaft-disc assembly of the aero-engine, an assembly mode that an axis of a low-pressure turbine shaft-disc is horizontal is adopted, the position and the posture of the low-pressure turbine shaft with the large length are adjusted precisely and advantageously in the butt-joint process, centering positioning alignment and end face correct close fitting of the turbine shaft relative to a connecting disc are achieved, and the butt-joint and assembling precision is improved;a turbine shaft position and posture adjusting table is applied, quantitative position and posture adjusting is conducted on the low-pressure turbine shaft through a mechanical way, experiential methods such as traditional manual hanger operating are replaced, manual repeated trial assembly and correction are avoided, the butt-joint efficiency is improved, and assembly consistency requirements ofassemblies are met; and the indexable tightening system is adopted, worker skill requirements and the labor intensity are reduced, and the tightening efficiency is improved.

The invention discloses a cold launcher sealing cover installed on a flange of an emitting barrel opening of a cold launcher. At least two bearing platforms are arranged on the outer side face of an opening of a ball-coronary-shaped barrel cover. One bearing platform is a hinge connector which is located at the lowest end of the ball-coronary-shaped barrel cover. The other bearing platforms are connectors. The connectors are used for detachably installing the ball-coronary-shaped barrel cover to the flange. The hinge connectors are used for hinging the ball-coronary-shaped barrel cover to the flange. The cold launcher sealing cover is designed in a ball coronary shape and hinged to the launcher barrel flange, and can be freely opened after constraint is removed without bursting, thereby being reused; in addition, high-wave-transmissivity glass reinforced plastic inner and outer skin is adopted for the sealing cover, so that the sealing cover has the good wave transmissivity; the space between the inner skin and the outer skin is filled with polyurethane foam, so that the sealing cover has the good heat preservation performance, and the wave transmissivity of the sealing cover is not affected.

The invention discloses a smooth variable-stiffness driver for a lower limb exoskeleton. The driver comprises a support assembly, an outer shell assembly, a spring assembly, a driving assembly and a roller assembly, wherein the outer shell assembly and the roller assembly keep synchronous movement. According to the driver, a linear spring is compressed in a non-linear manner by using a pair of gear structures, so that the smooth variable stiffness characteristic of the output torque is realized. The driver can be applied to hip joints and knee joints of the lower limb exoskeleton.

The invention relates to the technical field of vibration isolation buffering, in particular to a vibration isolation platform free of angular displacement. The vibration isolation platform comprisesa lower connecting plate, a metal rubber vibration isolator assembly, an anti-torsion assembly, an upper connecting plate and a transverse vibration isolation assembly; and the anti-torsion assembly is composed of a plurality of guide rail and sliding block combinations which are arranged in three spatially orthogonal directions and surround the outer side of the upper connecting plate. The anti-torsion component can restrain three torsion degrees of freedom, and meanwhile, the metal rubber vibration isolator assembly and the transverse vibration isolation assembly can isolate vibration in three directions horizontally and vertically, so that three-way vibration isolation free of the angular displacement of the vibration isolation platform is achieved.

The invention provides a large-travel active adjusting damper of a SMA wire split sleeve. The large-travel active adjusting damper of the SMA wire split sleeve comprises a split sleeve, a super-elasticity SMA wire, a piston, two external bolts, two damping rings and a mounting frame; the inner wall of the split sleeve is a periodic diameter change cylindrical surface, and is complementary with the outer wall of the piston in shape; two ends of the piston are connected with the external bolts for connecting the damper with other parts; two sides of the piston are respectively provided with one damping ring; and the super-elasticity SMA wire is uniformly wound on the insulation outer wall surface of the split sleeve. The large-travel active adjusting damper of the SMA wire split sleeve fuses the material damping of a super-elasticity memory alloy, the dry friction damping and the damping ring damping to improve the vibration reducing performance, uses the structure of the periodic friction surface to enable once travel of the damper to include multiple loading and unloading processes of the super-elasticity SMA wire to effectively increase the vibration amplitude borne by the damper, can realize self-adaption rigidity and damping adjusting functions through control of the SMA wire, prevents the failure problem of a sealing piece, and is long in service life, wide in application range and high in reliability.

The invention relates to the field of industrial buildings, in particular to a reclamation-area factory building column foundation and a construction protection method thereof. The reclamation-area factory building column foundation comprises stand column foundation bodies and is characterized in that longitudinal adjacent stand column foundation bodies are connected with each other through a longitudinal concrete connecting beam, and the transverse-span adjacent stand column foundation bodies are connected with each other through a process push pipe; the process push pipe comprises supports, short pipes, lining pipes and pull pipes, and the supports are respectively arranged on bearing platforms of the adjacent stand column foundation bodies; one section of short pipe is arranged on each support, and a pull pipe is arranged between the short pipes of the adjacent factory building column foundations; the lining pipes are arranged in the connecting positions of the pull pipes and the short pipes, and the outer diameters of the lining pipes are in clearance fit with the inner diameters of the pull pipes and the short pipes; and pins are arranged on the outer diameters of the lining pipes, and one end of each pin extends out from a long hole at the end part of each short pipe. Compared with the prior art, the reclamation-area factory building column foundation has the benefits that the longitudinal deformation is limited by utilizing the longitudinal connecting beam, the problem that the deformation caused by the transverse load of the factory building column foundation is overlarge is solved by adopting the reusable process push pipes, and the steel consumption is saved.