58 results about "Long term stress" patented technology

A high strength Al-Mg alloy in plate or extrusion form having significantly improved strength in both soft and work-hardened tempers as compared with AA5083 is provided. The materials have ductility, pitting, stress and exfoliation corrosion resistances equivalent to those of the AA5083. The materials have improved long term stress and exfoliation corrosion resistances at temperatures above 80° C. The composition is 5-6% Mg, >0.6-1.2% Mn, 0.4-1.5% Zn, 0.05-0.25% Zr, up to 0.3% Cr, up to 0.2% Ti, up to 0.5% each Fe and Si, up to 0.4% each Cu and Ag, remainder Al and inevitable impurities. Manufacture of plate of this alloy is by homogenizing an ingot, hot rolling the ingot into plate in the range 400-530° C., cold rolling the plate with or without inter-annealing, final and optionally inter-annealing of the cold rolled material at temperatures in the range 200-550° C.

The invention relates to a segmental prosthesis for a human body long bone diaphysis position and belongs to the technical field of prosthesises. In order to solve the technical problem of fast responding to the patient requirements, the segmental prosthesis with good stability and installation convenience is provided. The segmental prosthesis is characterized in that one end of a first tumor prosthesis and one end of a second tumor prosthesis are respectively provided with an intramedullary prosthesis handle, the other end of the first tumor prosthesis and the other end of the second tumor prosthesis are respectively provided with a blind hole with a clamp groove and / or a conical pin with a bayonet, the mutual connecting parts of the first and second tumor prosthesises are placed into the blind holes through the conical pins to realize the insertion connection, the conicity of internal cones passing by the blind holes is matched and anastomotic with the conicity of external cones of the conical pins, the bayonets and the clamp grooves are mutually embedded and connected into a whole, a middle segment prosthesis can be also added between the first tumor prosthesis and the second tumor prosthesis, and the three-segment connection is realized by the same method of inserting the conical pins into the blind holes. The segmental prosthesis has the advantages that the middle segment prosthesis can be prefabricated into different specification for standby use, the structure is simple, the installation is convenient, the stability is good, and the looseness due to long-term stress cannot easily occur.

A stress-measuring device (10) and method determines a level (15) of stress of a user (1), in particular long-term stress. The stress-measuring device (10) includes an input interface (12) for receiving a skin conductance signal (11) indicating the skin conductance of the user (1), the skin conductance signal (11) over time forming skin conductance trace data (13). The stress-measuring device (10) further includes a processing unit (14) for processing the skin conductance trace data (13). The processing unit (14) determines, over at least a portion of the skin conductance trace data (13), values of a rise time (tr) between at least two different points of the skin conductance trace data (13), a frequency distribution of the rise time (tr) values, and the level (15) of stress of the user (1) based on the determined frequency distribution.

The invention discloses a creep-resistant polypropylene composite material which is prepared from the following components in parts by weight: 23-96.8 parts of polypropylene, 1-30 parts of glass fibers, 1-20 parts of diisopropylbenzene peroxide, 1-5 parts of polypropylene grafted with maleic anhydride, 0.1-1 part of an antioxidant, 0.1-1 part of a lubricant and 0-20 parts of a filler. With the addition of the glass fibers and the filler in the material, the rigidity of the material can be provided; with addition of diisopropylbenzene peroxide, the polypropylene material can be partially cross-linked, and the creep resistance of the polypropylene material is greatly improved. The material still maintains small deformation degree under long-term stress.

The invention provides a TE mode dielectric resonator device. A limiting groove is arranged at the bottom of a cavity; the surface and the underside of a TE01 mode dielectric resonance rod are each provided with a clamping groove; an upper support base and a lower support base are respectively clamped on the clamping groove; the lower support base is clamped in the limiting groove; the top of the upper support base and the top of the cavity are horizontally collinear; a cover plate comprises an inner cover plate and an outer cover plate; a groove is arranged at the bottom of the outer cover plate; an elastic body is arranged in the groove; and the outer cover plate is installed on the inner cover plate through a connecting part. By being supported by the upper and lower support bases, a TE01 mode dielectric resonator is stressed uniformly; the long-term stressed disadvantage of the traditional TE01 mode dielectric resonator while being installed laterally and installed reversely can be solved; due to support through the upper and lower support bases, heat generated by the TE01 mode dielectric resonance rod can be effectively transferred to the cavity and the cover plate, such that heat dissipation of the cavity body is easily carried; and in addition, due to improvement of the cover plate, the problem that the cavity and a TE01 mode medium are in poor contact due to the machining tolerance can be solved.

The invention discloses an adjustable device for testing self-balancing long-term stressed wood columns. The device comprises at least three parallel threaded rods, wherein the threaded rods are movably sleeved by a first steel plate, a second steel plate, a third steel plate, a fourth steel plate and a fifth steel plate from top to bottom in sequence; the upper side of the first steel plate on the threaded rods is provided with upper positioning bolts; the lower side of the fifth steel plate on the threaded rods is provided with lower positioning bolts; the lower side of the fourth steel plate on the threaded rods is provided with locking bolts; a pressure sensor is arranged between the second steel plate and the third steel plate; a spring is arranged between the third steel plate and the fourth steel plate; a hydraulic oil cylinder is arranged between the fourth steel plate and the fifth steel plate; the lower side of the first steel plate is provided with an upper cutter hinge mechanism; the upper side of the second steel plate is provided with a lower cutter hinge mechanism; and a wood-column mounting space is left between the upper cutter hinge mechanism and the lower cutter hinge mechanism. The device disclosed by the invention solves the problem that the vertical pressure can not be applied to the full-size wood columns for a long time, and the device is easy to assemble and disassemble and is specially used for testing the long-term stressed wood columns.

The present invention relates to silicone rubber compositions and long-term-stress-resistant silicone elastomers obtained therefrom, which have excellent resistance to long-term dynamic mechanical stresses, and to their use.

The invention relates to a detection system and method, belonging to the field of stress monitoring of coal mine working faces, in particular to a real-time detection system and method of coal mine working faces based on a belt conveyor. The system and method use the belt conveyor installed in the Yunshun Lane of the working face as the source of vibration, and the seismometers are arranged in the Yunshun Lane and the return air lane on the other side of the working face, and the signal is obtained by recording the vibration for a certain period of time. For the seismic shot set with high noise ratio, the velocity distribution CT of the working face is obtained through tomographic processing, and the CT of the working face of each time period is connected to form a "cloud image" that changes with time, and the abnormal area of ​​stress adjustment can be found. Send an early warning signal. Therefore, the system and method can realize long-term real-time stress scanning of the whole working face.

The invention relates to a standing and lying type wheelchair with a turnover function. A foot supporting mechanism is rotationally connected with a cushion frame and a wheelchair frame; the cushion frame is placed on the wheelchair frame through rollers; a turnover mechanism is arranged on the cushion frame; the cushion frame is rotationally connected with a left backrest frame and a right backrest frame; a running mechanism, the turnover mechanism, a standing mechanism and a lying mechanism are connected with a control structure respectively, so that turnover, standing, lying and universal running control are achieved. A lying function is achieved through the cooperation of two motors of a back raising mechanism and the foot supporting mechanism, and a single back raising function can be achieved by individually operating one motor; moreover, anti-tilting wheels are mounted behind rear driving wheels, and front anti-tilting wheels are additionally arranged at the lower part of a foot supporting frame in front of small universal wheels, so that the functionality and the safety of the wheelchair are improved. The turnover function is combined to the standing and lying type wheelchair, an automatic timing turnover function is achieved by the simultaneous overturning of a single backrest and a cushion, the long-term stress on the hip and the back of a bedridden patient is relieved in an assisting way, the occurrence probability of bedsore is reduced, and the burden on a nurse is reduced.

Disclosed is a pitching type simple parking device. The pitching type simple parking device comprises a steel frame, an upper vehicle carrier plate, a lifting device and an anti-falling device, wherein the lifting device comprises a lifting rack and cylinders. The pitching type simple parking device is characterized in that the anti-falling device comprises an anti-release shaft, an anti-falling hook, a rotating shaft and an anti-falling drawbar, wherein the anti-release shaft is arranged on the lifting device; one end of the anti-falling hook is a hook end for hooking the anti-release shaft, and the other end of the anti-falling hook is fixed mounted on the rotating shaft; both ends of the rotating shaft are provided with anti-falling lugs which are fixedly connected to the bottom of the upper vehicle carrier plate; the anti-falling drawbar is fixed to the end portion of the rotating shaft in the radial direction of the rotating shaft, provided with a through hole and hinged to one end of a push-pull unit through cooperation of the through hole and a connector, the other end of the push-pull unit is coaxially connected with the push-pull rod of an electromagnet, and the electromagnet is fixed mounted at the bottom of the upper vehicle carrier plate through an electromagnet support. The pitching type simple parking device can avoid oil leakage, damage and the like due to long-term stress of hydraulic cylinders and long-term internal high pressure of pipes and eliminate the potential risk that the anti-falling hook cannot be opened due to hydraulic oil leakage.

The invention discloses a supporting roller device for a tube type belt conveyor, comprising a partition board vertical to the running direction of a belt, a plurality of supporting roller brackets fixedly arranged on the surface of the partition board, and a plurality of supporting rollers respectively fixedly arranged on the supporting roller brackets. The central line of the rotating shafts of the supporting rollers form a regular polygon; the number of the supporting rollers is even; and adjacent two supporting rollers are respectively positioned at both sides of the partition board. Because adjacent two supporting rollers are arranged at both sides of the partition board, even force is applied on the partition board which is therefore not bent because of long-term stress on one side. The contact time between six supporting rollers arranged at both sides of the partition board and the belt is prolonged to improve the operation stability of the belt.

A high-strength steel sheet is provided which, even when subjected to long-term stress-relief annealing after welding, decreases little in strength and which has satisfactory low-temperature HAZ toughness. The high-strength steel sheet has a chemical composition adequately regulated and has a CP value defined by the following equation (1) of 5.40% or higher and a carbon equivalent (Ceq) defined by the following equation (2) of 0.45% or lower. CP value = 125[Ti]+111[Nb]+60[V]+15[Mo] (1) ([Ti], [Nb], [V], and [Mo] indicate the contents (mass%) of Ti, Nb, V, and Mo, respectively.) Ceq=[C]+[Mn] / 6+([Cr]+[Mo]+[V]) / 5+([Cu]+[Ni]) / 15 (2) ([C], [Mn], [Cr], [Mo], [V], [Cu], and [Ni] indicate the contents (mass%) of C, Mn, Cr, Mo, V, Cu, and Ni, respectively).