77results about How to "Improve the safe service life" patented technology

The present invention relates to method of applying prestressed binding steel in reinforcing and repairing available concrete structure. The method includes the reinforcing method of adhering initial tension high strength steel sheet for reinforcing and adhering no-tension high strength steel sheet onto the concrete structure with reinforced displacement to reinforce. The reinforcing structure and the steel sheet realize the integral operation via high strength screws and binding surface to transfer shearing force. The reinforced concrete structure has greatly raised bearing capacity, rigidity and structural anti-cracking property within the normal operation stage. The method can prolong the safe service life of concrete structure and reduce investment for re-constructing building.

The invention discloses a preparation method of low-dielectric-constant insulating paper. The method comprises the following steps of: stirring and dispersing raw wood pulp by use of a defibering device; pouring the prepared SiO2 hollow microsphere suspension into the defibering device, mixing, and continuing to stirring, wherein the stirring temperature is normal temperature, the stirring time after the mixing is 2-10 minutes, and the stirring rate is 3,000r/min; after the stirring, manufacturing the insulating paper quantized to 120g/m<2> on a paper former; and compacting and forming, wherein the SiO2 hollow microsphere added to the obtained low-dielectric constant insulating paper accounts for 1-7%. In the modified insulating paper disclosed by the invention, silicon dioxide hollow microsphere is added, the insulating performance of a transformer composite insulating system is improved by reducing the relative dielectric constant of the insulating paper, and the safe service life is prolonged. Meanwhile, the steps of the preparation method are simple and easy to realize, and the cost is low.

The invention provides low-cost oil-based annulus protection fluid applicable to a CO2 flooding well and a preparation method thereof and belongs to the technical field of corrosion protection of an oil and gas well. A low-cost oil-based annulus protection fluid system applicable to the CO2 flooding well is prepared by compounding engine oil, a corrosion inhibitor, a bactericide, an oxygen removing agent, a density regulator and a surfactant. The annulus protection fluid is prepared from the following components in percentage by mass: 1 percent to 3 percent of a morpholine derivative compoundcorrosion inhibitor, 0.8 percent to 1.6 percent of halogenated hydantoin bactericide, 3 percent to 5 percent of the oxygen removing agent, 5 percent to 30 percent of an organic acid salt density regulator, 3 percent to 5 percent of a non-ionic type polyoxyethylene type surfactant and the balance of the engine oil. The oil-based annulus protection fluid provided by the invention has a very good protection effect on a shaft tubular column of the CO2 flooding well and has the advantages of good high-temperature stability, good low-temperature freezing resistance and long-period stability; meanwhile, the refrigeration engine oil is used as a dispersant, so that the low-cost oil-based annulus protection fluid has the advantages of low cost and the like.

The invention discloses a heating furnace control and combustion optimization method. The problem that a heating furnace system is not easy to control is solved. A control strategy combining an advanced control algorithm and a conventional control algorithm is adopted, and continuous stable operation of the heating furnace system is ensured. O2 and CO switching control is used, and low-oxygen combustion is achieved. A national standard simplified formula serves as an optimized target. Real-time optimization of the oxygen content in flue gas is achieved through a self-optimization algorithm, and the aim of economical combustion is achieved.

The invention discloses a novel substitute material of seamless steel tubes for oil cylinders. The novel substitute material is prepared from the components in percentage by mass: 0.15-0.19% of C, 0.3-0.45% of Si, 1.35-1.6% of Mn, less than or equal to 0.025% of P, less than or equal to 0.015% of S, less than or equal to 0.25% of Cr, less than or equal to 0.25% of Ni, less than or equal to 0.1% ofMo, less than or equal to 0.1% of Ti, less than or equal to 0.1% of V, less than or equal to 0.2% of Cu, less than or equal to 0.025% of Al, less than or equal to 0.1% of Nb and the balance of Fe. According to the novel substitute material, by properly reducing the contents of C and Si, the carbon equivalent in the seamless steel tube material for the oil cylinders is maintained between 0.40% and0.45%, the weldability and heat sensitivity crack tendency of the material is reduced to a great extent, the safe service life of an oil cylinder product is prolonged, by reducing the content of C and properly increasing the content of Mn, a guarantee is provided for the impact toughness of the material after heat treatment, by optimizing the heat treatment process, the hardness after heat treatment is ensured to be 235-255 HB, the impact toughness at -20 DEG C exceeds 70 J, the turning performance of an oil cylinder pipe is improved, and meanwhile, the fatigue life in a severe environment isprolonged.

The invention relates to the technical field of battery fixing frames, and concretely relates to a detachable battery fixing frame for a new energy automobile based on sliding. The fixing frame comprises a clamping device, splicing devices are symmetrically arranged on one side of the clamping device, top sliding connection devices are arranged at the tops of the clamping device and the splicing devices, the clamping device comprises a clamping fixing frame, and cooling devices are symmetrically arranged on the two sides of the central axis of one side of the inner wall of the clamping fixing frame. Each cooling device comprises an annular motor shell, a motor is arranged in the motor shell, a rotating shaft is arranged at the circle center of one end of the motor, fan blades are arranged at one ends of the rotating shafts, each splicing device comprises a splicing fixing frame, and a battery is not convenient to detach from the fixing frame, and after an automobile is driven for a long time, a large amount of heat is generated between the batteries to increase the temperature in the fixing frame and soften protective shells on the surfaces of the batteries, so that electric shock and explosion danger are caused by wire contact, and the service life of the batteries is shortened.

The invention relates to a composite material buoyancy tank glued by a wood-plastic foaming board, a PIN core material and a foaming board, and belongs to the technical field of application of new buoyancy materials. A buoyancy tank which is low in mounting cost and can provide certain buoyancy needs to be mounted in agricultural and piscatorial water areas of which the water depth exceeds 3m or which are not suitable for piling construction, such as fishponds, reservoirs and lakes, so as to bear the weight of a photovoltaic power generators floating on the water surface. The composite material buoyancy tank is made according to the following steps of: dividing the foaming board according to a design drawing; bonding the divided foaming boards together with waterproof glue so as to form a buoyancy tank made of the foaming boards; filling the buoyancy tank made of the foaming boards with EPS buoyancy foams; gluing a waterproof two-sided adhesive tape with a PIN core material layer on the outer side of the buoyancy tank made of the foaming boards; and sequentially gluing the PIN core material layer, a wood-plastic foaming board and a glass-fiber wrapping layer by using waterproof glue from inside to outside so as to obtain the composite material buoyancy tank which is needed when photovoltaic power generation is performed on the water surface in agriculture and fishery.

The invention discloses a distributed bridge real-time monitoring device based on an LORA wireless communication. The device comprises three parts, namely a plurality of remote data acquisition nodes,a centralized monitoring terminal and an LORA wireless communication network, wherein networking is carried out through LORA wireless communication. By means of an analog switch gating, different operational amplifier gain feedback resistors are gated, different gain multiples are achieved, and different intensity signals are amplified under different working conditions; system working time synchronization and position positioning are realized through a GPS, and the synchronous work of the plurality of remote data acquisition nodes is ensured; a solar cell panel is used for generating electricity, a rechargeable battery is charged and accumulated through a battery management module, and a system power supply is provided for the remote data acquisition nodes; and an acoustic emission principle is applied to calculate and analyze acquired data in a centralized monitoring terminal, and positions and sizes of bridge cracks are determined. The device of the invention has the beneficial effects that accident potentials are found early, effective measures are taken, safe and healthy operations of bridges are ensured, and the safe service lives of the bridges are effectively prolonged.

The invention discloses a bridge crane conical motor, comprising a housing, a front end cover, and a rear end cover. The motor also comprises a motor shaft. The motor shaft is provided with a conical rotor. The outer ring of the conical rotor is provided with a stator matched with the conical rotor. The motor shaft is rotatably connected with the front end cover and the rear end cover respectively using bearings. The motor shaft is also provided with a part extending out of the rear end cover. The part of the motor shaft, extending out of the rear end cover, is provided with a bridge crane conical motor braking device. Since the part of the motor shaft of the bridge crane conical motor, extending out of the rear end cover, is provided with the bridge crane conical motor braking device, and a technical problem that an original bridge crane conical motor is prone to have friction between the rotor and the stator to burn the bridge crane conical motor is overcome. The bridge crane conical motor realizes to operate safely and stably, operation and maintenance cost of the bridge crane conical motor is reduced, and safe service life of the bridge crane conical motor is improved.

The invention discloses a reinforced aluminium alloy compressive cable. The reinforced aluminium alloy compressive cable comprises a tubular aluminium alloy conductor; a carbon fibre composite reinforced core is arranged in the centre of the tubular aluminium alloy conductor; a thin copper strip is arranged between the carbon fibre composite reinforced core and the tubular aluminium alloy conductor; an insulation layer is wrapped outside the tubular aluminium alloy conductor in an extruded manner; a single-wire layer, which is formed by a plurality of conductive single wires in a parallel winding manner, is wound outside the insulation layer; a buffer layer and an outer sheath are lapped outside the single-wire layer; and a metal compressive tube is also arranged between the buffer layer and the outer sheath. The reinforced aluminium alloy compressive cable disclosed by the invention is high in compressive strength and mechanical strength, good in moisture resistance, sealing performance and flexibility, low in cost and long in service life.

The invention relates to a building roof waterproof layer and belongs to the technical field of building technologies. The building roof waterproof layer comprises a metal substrate which is provided with a transparent flexible layer. A transparent protection layer is arranged on the transparent flexible layer which integrates the waterproof function and the function of providing cathode protection for the metal substrate. The transparent flexible layer can generate free electrons through light by means of the photoelectric effect. The building roof waterproof layer adopts the metal substrate with a cavity, so that an excellent heat preservation effect is achieved, and accordingly temperature control energy consumption in winter or summer can be reduced, and comfort is improved. The flexible layer adopted by the building roof waterproof layer integrates the waterproof function and the cathode protection function, the corrosion rate of the metal substrate can be greatly delayed, and the safety service life of a building roof can be prolonged remarkably. The building roof waterproof layer can be applied to roofs of commercial buildings such as markets and shopping centers, industrial buildings like industrial plants, and other buildings such as subways, airports and stations.

The invention discloses a power wire alarm device. The device comprises a mounting plate and a box body; the box body is fixedly arranged on the mounting plate; a current device is fixedly arranged inthe box body; a warning lamp and a buzzer are fixedly arranged at the top of the box body; a temperature sensor and a humidity sensor are fixedly mounted at the top of the cavity of the box; a plurality of air outlet pipes are equidistantly arranged in the box body from front to back; a small fan is fixedly mounted at the top of the box body through a bracket; the output end of the small fan is connected with a main air guide pipe in a sealed mode. The end, away from the small draught fan, of the main air guide pipe is connected with branch air guide pipes with the same number as the air outlet pipes. The device has the advantages that the moisture-proof, dust-proof and high-temperature-proof functions are realized, internal components can be effectively protected in the long-time use process, the safety service life of the device is greatly prolonged, and the practicability is realized.

The invention discloses an anti-steel-seepage furnace floor structure. The anti-steel-seepage furnace floor structure is composed of a furnace floor area, a furnace floor arc transition area and a molten pool transition area; the furnace floor area, the furnace floor arc transition area and the molten pool transition area are each provided with a lower permanent layer furnace lining and an upper working layer furnace lining, and the working layer furnace lining of the furnace floor arc transition area is closely built on the permanent layer furnace lining of the furnace floor arc transition area; the working layer furnace lining of the molten pool transition area is closely built on the permanent layer furnace lining of the molten pool transition area; and a triangle area is generated among the permanent layer furnace lining of the furnace floor arc transition area, the working layer furnace lining of the furnace floor arc transition area, the permanent layer furnace lining of the molten pool transition area and the working layer furnace lining of the molten pool transition area. The anti-steel-seepage furnace floor structure can give full play to the advantages of high density andhigh strength of shaping products.

The invention discloses a strain gauge attaching device and method for a deep-hole shaft pin sensor, and belongs to the field of shaft pin sensors. The problems that an existing strain gauge attaching device of a deep-hole shaft pin sensor cannot ensure that a strain gauge is accurately positioned and is poor in strain gauge attaching effect are solved. The strain gauge attaching device comprises two arc plates and a bar core. The arc plates are in a circular arc tile shape. Each arc plate comprises an inner arc face, an outer arc face and two transition faces between the inner arc face and the outer arc face, wherein the two transition faces are on the same plane. The cross section of the bar core is in a circular shape. The radius of the circular cross section is equal to the circular arc radius of the cross section of each inner arc face. The circular arc on the cross section of each outer arc face is concentric with the circular arc on the cross section of the corresponding inner arc face. According to the strain gauge attaching device and method, the position of the strain gauge in the deep-hole shaft pin senor can be accurately positioned, and therefore high-quality and accurately-measured products are obtained.

The invention discloses a saw chain of a felling saw. The saw chain comprises connecting chain links and cutting chain links connected through driving pieces, wherein the driving pieces are rotatably connected with the connecting chain links and the cutting chain links through rivets; the cutting chain links comprise left cutting chain links and right cutting chain links which are arranged in turns; the left cutting chain links comprise main connecting pieces, sub connecting pieces, connection parts connected between the main connecting pieces and the sub connecting pieces, cutting blades connected on the sides, away from the connection parts, on the main connecting pieces, and limiting heads which are integrally connected on the main connecting pieces and are positioned at the front of the cutting blades; notches are reserved between the limiting heads and the cutting blades; and the left cutting chain links are formed through stamping a complete metal piece. According to the saw chain, the structure is ingenious, the strength is high, the cutting speed is high, and the service life is relatively long.