55 results about "Fatigue Problem" patented technology

The invention belongs to the technical field of civil engineering, and specifically relates to a prestressing anti-fatigue girder. The prestressing anti-fatigue girder comprises a top flange, a bottom flange, a web, a bearer stiffening plate and prestressing anchor slab, anchor holes, a high-strength prestressing steel strand, an anchoring stiffening plate, an anchor head, an arc plate, a bearer steel bracket and lateral movement proof cushion block. The prestressing steel strand is penetrated into anchor holes which are near to a tensile flange and are symmetrical on two sides of the web, and is anchored by the anchor head after stretch-draw, so as to generate a precompression on a girder tensile area. After prestressing relaxation, the prestressing steel strand has a pressure stress larger than amplitude of a self-weight stress and a fatigue tensile stress; and the girder bottom flange will not be subjected to tension under compound effects of deadweight and fatigue load. Therefore,a fatigue problem id solved. According to the invention, a design fatigue stress amplitude of the bottom flange is increased from a former one limited in an allowed fatigue stress amplitude to one approaching a design strength f, so as o substantially increase anti-fatigue capability and change a fatigue brittle failure to a ductility strength problem. An ultimate strength of the bottom flange isincreased by one time, so as to substantially increase material utilization rate of high-strength steel.

The invention relates to a steel rail, and in particular relates to a vanadium-chromium micro-alloyed superfine pearlite steel rail. The technical problem to be solved by the invention is to provide the vanadium-chromium micro-alloyed superfine pearlite steel rail. The vanadium-chromium micro-alloyed superfine pearlite steel rail comprises the following components in percentage by weight: 0.78-0.86% of C, 0.15-0.70% of Si, 0.4-1.20% of Mn, 0.3-0.8% of Cr, 0.04-0.12% of V and less than or equal to 0.01% of S. A production method of the vanadium-chromium micro-alloyed superfine pearlite steel rail comprises the following steps: applying a water-mist gas mixture to the rail head part of the steel rail with waste heat after finishing rolling, wherein the cooling rate is 4-8DEG C/s; applying compressed air when the surface layer temperature of the rail head is reduced to 500-550 DEG C at a cooling rate of 1.5-3.5DEG C/s; and performing air cooling to room temperature when the temperature is less than 400 DEG C. The steel rail disclosed by the invention has excellent wear-resistant performance and good contact fatigue resistance, and is suitable for road segments with too fast wear and prominent fatigue problems of heavy haul railways.

A load bearing structure for a large-scale vehicle includes a base and a return unit. The base includes a mounting seat and a side-skirt connecting member which has a pivot portion pivoted to the mounting seat. The pivot portion includes a first contact portion, a second contact portion and a third contact portion, and under normal conditions, the first contact portion is abutted against the mounting seat. The return unit is located within the pivot portion and pivoted to the mounting seat to keep the side-skirt connecting member staying in the normal conditions. The third contact portion defines a second angle with respect to the top plate, which allows the side-skirt connecting member to pivot in a bidirectional manner when returning to its original position, so that collision between the mounting seat and the side-skirt connecting member can be prevented, and the fatigue problem is consequently solved.

The present invention relates to traffic means, and is a kind of two purpose sedan for both sitting and sleeping. The sedan features that the back seats including chairs, backs and back wall board, the sleeper support and the back baggage rack may be combined and altered to form either seats or sleeper. The present invention can well solve the fatigue problem in traveling. Compared with available technology, the present invention has the features of reasonable design, simple structure, simple operation, etc.

The invention discloses a steel-concrete combined continuous beam bridge for releasing pulling stress of a carriageway slab. The steel-concrete combined continuous beam bridge comprises a steel beam and the concrete bridge carriageway slab fixed on the steel beam. A transverse penetrating breaking joint is formed in the position, above an intermediate pier corresponding to the continuous beam bridge, of the concrete bridge carriageway slab. The local sections of the two sides of the transverse penetrating breaking joint have relative longitudinal telescoping deformation between the concrete bridge carriageway slab and the steel beam. The pulling stress generated from high negative bending moment is unloaded and transferred to the steel beam, pulling of the concrete bridge carriageway slab is avoided, the stressing state of the whole steel-concrete combined beam is optimized, performance superiority of steel materials and concrete can be played, vertical load of the carriageway slab is directly transmitted to the steel beam, it is ensured that the carriageway slab does not generate abnormal vertical deformation, stress concentration and fatigue problems of the carriageway slab and the steel beam from fixing to separating in a junction connecting local area, construction and a construction technology of the carriageway slab are greatly simplified, and the whole stress performance of the bridge is improved, the using period of the beam bridge is prolonged, and the construction and maintaining cost are reduced.

The invention discloses precision infusion device automatic assembling equipment, and especially relates to a precision infusion device automatic assembling equipment filter material loading portion comprising at least one oscillating type feeder, a material sorting and flat push device, and a take-out device, thus improving the precision infusion device production processing efficiency; in the whole material loading process of the filter, the filter cannot disengage from a material sorting and flat pushing channel, and the filter is good in feeding and conveying stability; in addition, assembling personnel can easily have fatigue problems in long time working, and operations can easily deform; the automatic equipment can solve said problems, and can stably and continuously work with high efficiency under a long time high intensity working environment; finally, the precision infusion device automatic assembling equipment filter material loading portion can effectively can effectively solve the economic problems that enterprise artificial labor cost output is high.

The invention discloses turnouts using a cam groove for track switching. A track-switching assembly is arranged between two turnout track assemblies; the track-switching assembly uses a cam mode of acam cylinder and the cam groove to drive the movement of a track-switching driving plate; the track-switching driving plate realizes the track switching by controlling the left-right movement of the turnout track assemblies; and the ends of the turnout track assemblies are mounted on track sleepers by slightly-rotational damping assemblies. The turnouts using the cam groove for the track switchinguse the cam groove to drive the track switching instead of screw rods in the prior art, and the cam groove has high wear resistance and can bear greater vibration force, so as to improve the bearingcapacity of the track switching, to enhance the service life and to ensure the safety of the track switching. The turnouts are arranged on the slightly-rotational damping assemblies and can slightly swing during the track switching process, so as to prevent the turnouts from being subjected to excessive rigidity force, to avoid fatigue problems of the turnouts and to greatly improve the service life of the turnouts and the adaptability of the track switching of the turnouts.

The invention belongs to the field of biomedical engineering and provides an electroencephalogram brainwave alpha based infrasonic wave driving fatigue relieving method and device. The electroencephalogram brainwave alpha based infrasonic wave driving fatigue relieving method comprises the steps of acquiring electroencephalogram signals of a driver in quiet and eye opening states, extracting electroencephalogram brainwaves alpha (8-12Hz) as a infrasonic wave signal source, and then enabling infrasonic waves to act on the head of the driver through a speaker system so as to relieve driving fatigue. The electroencephalogram brainwave alpha based infrasonic wave driving fatigue relieving device consists of a controller, a power amplifier, the speaker system and a fatigue monitoring device, wherein the controller controls signal output, the power amplifier amplifies the power of input signals and transmits the signals to the speaker system, a hydraulic system controls the position of the speaker system, and the fatigue monitoring device detects the state of the driver and feeds back a detection result to the controller. The fatigue relieving method can effectively solve the driving fatigue problem of the driver and does not produce influence on non-driving persons. The driving fatigue relieving device can be combined with an interior audio system to achieve full-automatic operation.

The invention discloses an omni-directional prestress antifatigue combined steel structure wind tower. The omni-directional prestress antifatigue combined steel structure wind tower is composed of a lattice type tower frame, a concrete transition segment and a steel structure tower cylinder. The omni-directional prestress antifatigue combined steel structure wind tower has the beneficial effects that all rod parts of the omni-directional prestress antifatigue combined steel structure wind tower bear pressure under the work loads, the fatigue problem (possible tension under the ultimate load) is solved, and the advantages of being convenient to construct, reasonable and feasible in structural stress and capable of saving materials are achieved.

The invention discloses a shear-resistant and shock-isolation assembly type synchronous variable-position comb teeth-shaped telescopic device which aims at large-span bridges. The telescopic device comprises a left-right displacement box fixedly connected to a beam end, a hinge, a displacement box beam, a cross beam, a rubbish separation plate, a left comb teeth plate, a middle comb teeth plate and a right comb teeth plate; each comb teeth plate is fixedly connected to a lower component through a shear-resistant high-strength bolt, and the cross beam is arranged on the displacement box beam; and at least one group of vibration isolation supporting seats are arranged below comb teeth of each comb teeth plate. A through hole is formed in a non-comb teeth portion of each comb teeth plate, a shearing-resistant pin is fixedly connected to the through hole, a steel ring is arranged on the periphery of the lower part of the shearing-resistant pin, and a high-performance elevation adjusting filling material is poured between the steel ring and the shearing-resistant pin; and the rubbish separation plate and a dustproof plate are arranged below the comb teeth parts of the comb teeth plates,and the left side or the left side or the right side of the rubbish separation plate is in a zigzag shape. According to the telescopic device, the shearing-resistant fatigue problem of the comb teeth-shaped bridge telescopic device is solved, the sludge can be extruded conveniently, the construction period is greatly shortened, the installation process is convenient, the time is saved, and the precision is accurate.

The invention discloses a film inspection device, comprising a table body, the table body includes a table top and table legs; a light box, the bottom plate of the light box is fixed on the table top, and A white light source; the top of the light box is a white light-transmitting board. There are also dimmers and cooling fans. The invention effectively solves the problem of high labor intensity and easy fatigue during long-term and careful inspection of film sheets, ensures the inspection effect, and can adjust the intensity of the light source according to the different densities of film sheets, has good heat dissipation performance, and is simple in structure. Easy to use.

The invention relates to a synchronous power device applied to an electric bicycle performance test platform. The device comprises a base, a driving roller and a driven roller. The driving roller andthe driven roller are arranged inside the base with an adjustable interval. A positioning gear is arranged on the base. A drive motor is arranged on one side of the driving roller, and a driving gearis arranged on the other side. A driven gear is arranged on one side of the driven roller. A number of tensioning wheels are arranged on both sides of the driving gear. The driving gear, the tensioning wheels, the positioning gear and the driven gear are in transmission connection through a rack synchronous belt. The synchronous power device can reduce the horizontal static friction force appliedto a wheel when front and rear rollers rotate under the precondition of ensuring the power of front and rear rollers. The total length of a transmission belt is shortened. The problem of fatigue stretch caused by multiple uses of the device is solved.

The invention discloses a structure of an upper and lower steel plate sandwich steel-concrete combined bridge deck slab. The structure comprises a top steel plate (1) and a bottom steel plate (2). Thebottom steel plate (2) is fixedly connected with main beams (3) below the bottom steel plate (2). Multiple web plates (4) are arranged between the top steel plate (1) and the bottom steel plate (2) in the transverse bridge direction. Multiple chambers are formed in the top steel plate (1) and the bottom steel plate (2) by means of the adjacent web plates (4), high-flowability concrete (6) is poured into the chambers, and the structure of the upper and lower steel plate sandwich combined bridge deck slab is formed. The invention further discloses a construction method of the upper and lower steel plate sandwich steel-concrete combined bridge deck slab. By means of the structure of the upper and lower steel plate sandwich steel-concrete combined bridge deck slab, the fatigue problem of orthotropic steel bridge deck slabs is solved, and the problems of durability and large dead weight of negative bending moment area cracking of concrete bridge deck slabs are also solved.