42results about How to "Guaranteed design life" patented technology

The invention belongs to the field of roof water prevention and particularly relates to an assembly type roof drainage system and a construction method. The assembly type roof drainage system comprises a drainage assembly and a waterproof layer, wherein the drainage assembly and a roof are arranged together, and the waterproof layer and drainage pipes are arranged together. The waterproof layer comprises an impermeable layer arranged on the roof. The impermeable layer is sequentially provided with a coiled material waterproof layer, a heat preservation layer and a liner waterproof layer. The drainage assembly comprises an upper drainage pipe provided with an upper water inlet and a lower drainage pipe arranged on the periphery of the upper drainage pipe. A gap is reserved between the upper drainage pipe and the lower drainage pipe and forms a lower water inlet. The upper water inlet and the liner waterproof layer are arranged together, and the lower water inlet and the coiled material waterproof layer are arranged together.

The invention discloses a self-potential roll-type cross wedge rolling mill, comprising a rack, an upper roll, a lower roll and a driving device used for driving the upper roll to move up and down. Upper bearing blocks are arranged at the two ends of the upper roll and lower bearing blocks are arranged at the two ends of the lower roll. Prestressed supports are fixedly arranged at the upper ends of the lower bearing blocks. Adjusting levers are connected on the prestressed supports by bolts. The cross wedge rolling mill is characterized in that a first self-potential adjusting device is arranged between the lower ends of the lower bearing blocks and the rack; a second self-potential adjusting device is arranged between the adjusting levers and the lower end faces of the upper bearing blocks; a third self-potential adjusting device is arranged between the upper end faces of the upper bearing blocks and the driving device; and axial self-potential adjusting devices with the same structure are arranged between the sides, positioned at the operating sides, of the upper bearing blocks and the rack as well as between the sides, positioned at the operating sides, of the lower bearing blocks and the rack. The invention has the following advantages: the bearing load is uniform when the rolling mill works, the design life of the bearing is ensured, the inner organizations of the rolled pieces are uniform, the rolling precision and the product quality are improved and scale production of the shaft parts by cross wedge rolling is realized.

The invention provides a light emitting diode (LED) lamp panel packaging structure and a driving method thereof. An LED lamp panel comprises a packaging substrate and a plurality of LED chips arranged on the packaging substrate; the chips are divided into a plurality of groups; the groups of chips are serially connected through gold wires; inputting pins of the groups of chips are jointly connected to a conductive trace; outputting pins of the groups of chips are jointly connected to another conductive trace; the conductive trace connected with the inputting pins and the conductive trace connected with the outputting pins are jointly connected to a multichannel connector, so that inputs and outputs of the groups of chips correspond to the corresponding channels of the multichannel connector, and the groups of chips are respectively driven independently.

The invention discloses a laser wire-filling welding method for a nuclear main pump shield sleeve, and belongs to the field of nuclear power. A laser wire-filling welding system performs pulse laser wire-filling welding on the shield sleeve; a thin plate is precisely cut, wound and clamped on a special welding tool, wherein a connection gap is enabled to be 0 to 0.55 mm; a front-mounting wire feeding mode is selected to accurately adjust a welding wire feeding position, wherein a certain welding wire height and filament distance are kept; optimized welding process parameters are selected, to realize laser wire-filling welding for longitudinal joints of the nuclear main pump shield sleeve by controlling accurate and automatic continuous movement of a pulse laser welding head and a wire feeding nozzle. The laser wire-filling welding method can guarantee small welding deformation of the shield sleeve and high diameter size precision, and furthermore, crystalline grains in welding lines are obviously thinned, and the influence on the physical and mechanical properties of a material is low; in the welding process, by the adding of a welding wire, the accuracy requirement on thin plate cutting is reduced, and the welding line has certain sine and cosine heights; therefore, the strength of the welding line is enhanced, and the service life of the shield sleeve is prolonged.

The invention provides a fastener plug-in type curved surface metal roof which comprises a base frame, primary purline supporting components, lengthening connecting fasteners, primary purlines, primary and secondary purline through connection components, secondary purlines, secondary purline panel through connection components, roof panel components and sealing components. The base frame is fixedly mounted on a civil engineering foundation roof face. The primary purlines are fixedly connected with the base frame through the primary purline supporting components. The secondary purlines are connected with the primary purlines through the primary and secondary purline through connection components. The secondary purline panel through connection components are connected with the secondary purlines. The roof panel components are connected with the secondary purline panel through connection components, two adjacent roof panel components are connected in an inserting mode, and the sealing components are arranged in the clearances of the roof panel components. A construction method mainly comprises the step that the base frame, the primary purline supporting components, the primary purlines, the primary and secondary purline through connection components, the secondary purlines, the secondary purline panel through connection components, the roof panel components and the sealing components are mounted in sequence. According to the fastener plug-in type curved surface metal roof and the construction method, steel and manpower cost can be effectively saved, the construction period can be shortened, and the new construction method of the curved surface metal roof is provided.

The invention relates to a self-heat-dissipating type lamp structure preventing sucking back and an achieving method. An auxiliary insulation conduction oil expansion fuel tank and a wire passing seal locking nut are connected to two screw holes in a screwed mode respectively. A power wire connected with a light source driver is connected with power through the wire passing seal locking nut. An insulation conduction oil expansion rubber piece is fixed into a circle of protrusions with internal threads by a locking external thread locking nut of the insulation conduction oil expansion rubber piece so that a middle hole can be sealed. Electrical light source devices are immerged into insulation conduction oil. Air in a lamp body is emptied so that the interior of a cavity of a shell of a lamp can be in a normal pressure state or in a micro positive pressure state due to environmental temperature change and turning on or off of the light source, the phenomenon of air sucking back caused by aging of a sealing piece of the lamp or the poor structural quality of the shell of the lamp due to manufacturing factors or the difference of the density or the temperature difference is effectively avoided, humidity and accumulated water are prevented from entering the shell of the lamp, the moisture-proof problem generally existing in the sealing type illuminating lamp is solved, the insulation conduction oil can transfer heat to the exterior of the lamp body fast and uniformly, and the heat dissipation problem is solved.

The present invention relates to a construction method adopting the corrosion protecting insulating cable in the overhead communication line, and the invention belongs to the technique field for protecting the overhead communication line. In the method the corrosion-protecting insulating cable is adopted at the three-line intersection for hanging the communication optical cable, and in other areathe common cable is adopted for hanging the optical cable. The corrosion-protecting insulating cable is obtained by assembling the corrosion-protecting insulating cable and the cable sleeved therein,and the oversheath is made of high-molecule composite material and the wall thickness of the oversheath is 1-2mm. The method reliably settles the hidden danger of disoperation of the three-line crossing to the communication line. Not only the construction method is safe, cheap and effective; but also the cable rust can be prevented in order to guarantee the design life of the overhead communication line.

The invention provides a valve-controlled sealed lead-acid battery, which can meet the current development needs of large-scale data centers, meet high-power discharge use, and have a long floating charge cycle life. In the valve-controlled sealed lead-acid battery of the present invention, the longitudinal ribs of the grid grid are radially distributed, the tabs are in the middle, the spacing of the longitudinal ribs is 0.7 to 0.8 times the spacing of the transverse ribs, and the grid adopts high tin and low calcium alloy, the tin content w% is 1.2-2.0%, the calcium content is 0.04-0.05%; the apparent density of the positive lead paste formula is 4.0-4.1 g / cm3, the negative lead paste formula has an apparent density of 4.4-4.5 g / cm3; the positive plate gamma value is 0.70~0.80, organic fiber material is added to the separator, the basis weight is 163~176 g / m2.mm at 10kPa, the porosity of the separator is 93~94%; the acid density of the electrolyte is 1.30~1.31g / cm3.

The invention discloses a self-alignment roll system of a cross wedge rolling mill, comprising a stand, an upper bearing seat, a roll and bearing seats arranged on both ends of the roll, wherein the upper ends of the bearing seats are fixedly provided with prestressing supports on which regulating rods are screwed. The self-alignment roll system of the cross wedge rolling mill is characterized inthat a lower self-alignment regulating device is arranged between the lower ends of the bearing seats and the stand, an upper self-alignment regulating device is arranged between the regulating rods and the upper bearing seat, wherein an axial self-alignment regulating device is arranged between the side surface of the bearing seat positioned on the operation side and the stand. The invention hasthe advantages that because the self-alignment regulating devices are arranged on the roll system, the roll system has the function of self-alignment regulation so as to ensure that the roll system has uniform bearing load when working and ensure the designing service life of bearings, the rolled pieces rolled by the roll system have uniform internal tissues, and the rolling precision and the product quality are improved, and the scale production of cross wedge rolling of long-shaft parts is realized.

The invention discloses an LED (Light-Emitting Diode) heat dissipation base plate, an LED packaging structure and a manufacturing method of the LED heat dissipation base plate and the LED packaging structure. An SOI (Silicon-On-Insulator) wafer or a monocrystalline silicon wafer is taken as a substrate. The heat dissipation base plate taking the SOI wafer as the substrate comprises an upper layer made of silicon materials, an etching stopping layer made of silicon dioxide materials and a bottom layer made of the silicon materials, wherein the upper layer comprises a silicon cup formed by etching; the etching stopping layer is positioned in the SOI wafer below the upper layer; and the bottom layer comprises at least two guide holes formed by etching. The heat dissipation base plate taking the monocrystalline silicon wafer as the substrate comprises a silicon cup, at least two guide holes and metal conductors, wherein the silicon cup is formed by etching on a first surface; the guide holes are formed by etching on a second surface; and the metal conductors are filled in the guide holes. The invention has the beneficial effects that a silicon-manufactured base plate is adopted to replace the existing various ceramic heat dissipation base plates; the structure is simple; not only can the purpose of highly-efficient heat dissipation be achieved, but also the basic production cost can be greatly reduced; and meanwhile, as the thermal expansion coefficient of a silicon is close to that of an LED chip substrate, the service life of an LED chip is facilitated to be prolonged.

The invention relates to a design method of concrete mix ratio based on requirements of an index of resistance to chloride ion intrusion and a strength index. The design method comprises the following steps: (1) determining design parameters of working performances, a strength index and an index of resistance to chloride ion intrusion of concrete material; (2) determining raw materials adopted for preparing concrete; (3) calculating a strength preparation value of the concrete and a diffusion coefficient preparation value of chloride ions; (4) determining a water-cement ratio calculation model; (5) determining a diffusion coefficient calculation model of the chloride ions and an age decay coefficient calculation model; (6) calculating the water-cement ratio of the concrete and the mixing amount of a mineral admixture; (7) checking the calculation of the mixing amount of the mineral admixture and the water-cement ratio; (8) determining the water consumption per square meter and the sand ratio of the concrete; (9) calculating the concrete mix ratio. Through the method, the requirements of the index of resistance to the chloride ion intrusion and the strength index, stipulated by the 28-day-age concrete, can be met.