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41results about How to "Large amount of expansion" patented technology
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Modified calcium oxide expansive agent used for cement concrete and preparation method thereof
ActiveCN104671698AAdjustable hydration historyReduce ineffective inflationPolyvinyl alcoholMaterials science
The invention provides a modified calcium oxide expansive agent used for cement concrete and a preparation method thereof. The modified calcium oxide expansive agent used for cement concrete comprises polyvinyl alcohol and a calcium oxide expanding clinker, wherein the surface of the calcium oxide expanding clinker is coated with polyvinyl alcohol. The modified calcium oxide expansive agent used for cement concrete has the beneficial effects that the hydration process of the calcium oxide expanding clinker can be regulated; invalid hydration at the plastic stage of concrete is reduced, the expansion quantity after hardening is increased and the shelf life of the product is prolonged; the modified calcium oxide expansive agent used for cement concrete can be used for crack and seepage resistance of a concrete structure and can substantially improve the durability of concrete.
Owner:JIANGSU SOBUTE NEW MATERIALS +1
Modified calcium oxide expansion agent for cement concrete
InactiveCN104692690AImprove crack resistanceSolve the problem of easy weathering failureLong chain fatty acidPhysical chemistry
The invention provides a modified calcium oxide expansion agent for cement concrete and a preparation method of the modified calcium oxide expansion agent. The modified calcium oxide expansion agent for the cement concrete has the specific surface area of 100-600m<2> / kg and is prepared from long-chain fatty acid and a calcium oxide expansion agent, wherein the surface of the calcium oxide expansion agent is coated with the long-chain fatty acid, and the mass ratio of the calcium oxide expansion agent to the long-chain fatty acid is (90: 10) to (999: 1). According to the modified calcium oxide expansion agent for the cement concrete, the humidity resistance is improved, the hydration of a plastic stage of the cement concrete is reduced, the hardened expansion quantity of the concrete is increased, and the concrete cracking resistance of the calcium oxide expansion agent can be improved.
Owner:JIANGSU SOBUTE NEW MATERIALS
Nuclear reactor fuel rod simulating electric heating device and assembly process
ActiveCN106328226ASimulate Thermal PropertiesAccurate and controllable electric heating powerNuclear energy generationNuclear monitoringPressurized water reactorThermocouple Wire
The invention discloses a nuclear reactor fuel rod simulating electric heating device and an assembly process. The device comprises a simulation jacket and simulation fuel element pellets, each simulation fuel element pellet is provided with 16 through holes axially extending along the simulation fuel element pellet, thermocouple wire anodes are mounted in part of the through holes, thermocouple wire cathodes are mounted in part of the through holes, and inert gas is stored in the rest through holes. Electric heating rods are mounted in an inner cavity of each simulation fuel element pellet, and a plurality of external wall temperature thermocouples are mounted on the outer side of the simulation jacket. The electric heating device is used for laboratory simulation of nuclear reactor fuel rods to carry out high-temperature degradation and reflooding behavioral experiments of fuel rods for pressurized water reactors under severe accident conditions. A working medium is an aqueous medium, a steam medium or an inert gas medium, a working pressure is 5MPa, a long-term working temperature is 1800 DEG C, and a short-term working temperature is 2400 DEG C.
Owner:NUCLEAR POWER INSTITUTE OF CHINA
Coolant system
ActiveUS20100031901A1Reduce pressureLower the volumeLiquid coolingCoolant flow controlExpansion tankNuclear engineering
An engine cooling system is provided with a cooling circuit including a coolant pump for supplying an engine with a coolant and for circulating the coolant in the cooling circuit, and at least one heat exchanger for cooling said coolant downstream of the engine, wherein an expansion tank is connected to the cooling circuit upstream of the coolant pump. The cooling system is pressurized by a pressure regulating arrangement arranged to pressurize coolant supplied to the cooling circuit from the expansion tank during at least one predetermined operating mode of the engine and the expansion tank is closed to the ambient atmosphere during all normal engine operation modes.
Owner:VOLVO LASTVAGNAR AB
Coolant system
ActiveUS8065980B2Reduce pressureLower the volumeLiquid coolingCoolant flow controlExpansion tankNuclear engineering
Owner:VOLVO LASTVAGNAR AB
Modified calcium oxide expansive agent used for cement concrete and preparation method thereof
ActiveCN104671697AImprove moisture resistanceLarge amount of expansionCrack resistanceMaterials science
The invention provides a modified calcium oxide expansive agent used for cement concrete and a preparation method thereof. The specific surface area of the modified calcium oxide expansive agent used for cement concrete is 100-600m<2> / kg and is prepared by coating a calcium oxide expanding clinker with redispersible latex powder, wherein the redispersible latex powder accounts for 0.1-10% of the total modified calcium oxide expansive agent used for cement concrete by mass. The modified calcium oxide expansive agent used for cement concrete has the beneficial effects that the humidity resistance of the modified calcium oxide expansive agent used for cement concrete is improved, invalid hydration at the plastic stage of cement concrete is reduced and the expansion quantity is increased after concrete is hardened, thus improving the concrete cracking resistance of the calcium oxide expansive agent.
Owner:JIANGSU SOBUTE NEW MATERIALS +1
Preparation method of high-plugging-strength leaking-stopping agent for well drilling
InactiveCN106520092AGood expansion performanceLarge amount of expansionDrilling compositionFiberSwelling capacity
The invention discloses a preparation method of a high-plugging-strength leaking-stopping agent for well drilling, belonging to the technical field of preparation of leaking-stopping agents. The theory of the preparation method comprises the following steps: carrying out graft modification on butyl polyacrylate resin by utilizing oxidized cassava starch and taking methyl ethyl ketone peroxide as an initiator under the catalysis of ethylene glycol antimony, so as to enhance expansibility; then modifying bamboo fibers by virtue of maleic anhydride, and combining the bamboo fibers with modified cassava starch grafted butyl polyacrylate resin by virtue of a coupling agent, so as to enhance strength; and then adding expanded vermiculite, so as to enhance the swell capacity and plugging strength. By utilizing the theory, the defects of existing leaking-stopping agents that the swell capacity is relatively low, the water flushing resistance is relatively weak, the plugging strength is low, and the repeated leakage easily occurs are effectively solved; and by applying the leaking-stopping agent to complex formations with big crevices and multiple caves, the permeability of a blocked layer can be well decreased, and the high strength and pressure resistance of the blocked layer can be obtained.
Owner:常州市鼎升环保科技有限公司
Low-frequency vibrating compacted shrinkage-compensating concrete and preparation method thereof
The invention relates to low-frequency vibrating compacted shrinkage-compensating concrete and a preparation method thereof. The low-frequency vibrating compacted shrinkage-compensating concrete comprises a cementing material, an expanding agent, a sand material, a stone material, water and a water reducing agent, wherein the expanding agent and the cementing material are in the weight percentageratio of 1 to (5.0 to 15.0) percent; the expanding agent comprises a calcium sulphoaluminate expanding agent and an additive; the additive and the calcium sulphoaluminate expanding agent are in the weight percentage ratio of 1 to (1.0 to 3.0) percent; the additive is one or two of NaAlO2 and KAlO2; the cementing material comprises cement and an active admixture; the active admixture is a compositemineral admixture which consists of coal ash and zeolite powder; the preparation method of the low-frequency vibrating compacted shrinkage-compensating concrete comprises the following steps: (1) adding the sand material, the stone material, the cementing material and the expanding agent into a stirring machine in sequence according to the using amounts above; (2) preparing the water reducing agent and the water into a solution according to the using amounts above, adding a water reducing agent solution into the stirring machine at a uniform speed, and stirring uniformly; and (3) pouring theuniformly stirred concrete on a vibrating mould table, and vibrating for 2 minutes at a low frequency.
Owner:CHINA CONSTR SCI & TECH CO LTD
Construction method for combination of water swelling sealing rod and water swelling glue
ActiveCN107143046ARepair operation is simpleQuality improvementArtificial islandsUnderwater structuresSocial benefitsBuilding construction
The invention discloses a construction method for combination of water swelling sealing rod and water swelling glue, which relates to the technological field of waterproof construction. In the construction method for combination of water swelling sealing rod and glue, the water swelling sealing rod is used as a main water stopping material and the water swelling glue is used as a bonding and fixing material as well as an auxiliary water stopping material on a lap joint. At the same time, the combination of water swelling rod and water swelling glue is applied to the construction of the waterproof part in a building. The construction method for combination of swelling sealing rod and water swelling glue can be extensively applied to concrete construction joints, late poured bands, wall pipes, pile crowns in underground projects and other joints which is suitable for the waterproof method. The construction method for combination of water swelling sealing rod and water swelling glue has much more polarization and application value. Besides, the economic and social benefits of the construction method for combination of water swelling rod and water swelling glue are extremely notable.
Owner:王军
Ductile iron before-furnace thermal analysis-eutectic expansion quick detection apparatus and detection method
PendingCN106501301ALarge amount of expansionSignificant displacement incrementMaterial thermal coefficient of expansionCooling curveTest sample
For achieving before-furnace quick evaluation on nodularizing inoculation effect of ductile iron, the invention discloses a novel thermal analysis-eutectic expansion quick detection apparatus and a detection method. The detection apparatus includes: a cylindrical dry moulding sand sampler (2) which is enclosed by a fixed half-sleeve (16) and a movable half-sleeve (17) which are flexibly connected to each other through two pre-loaded springs (14). A K-type thermocouple (4) is vertically arranged and an expansion rod (7) is horizontally disposed in the sampler. The thermocouple measures cooling curve of molten iron in a sample cup at a hot node. One end of the expansion rod is contact-connected to a screw (3) on the fixed half-sleeve, while the other end is contact-connected to a measuring rod of a linear displacement sensor (9) for transmitting linear displacement in the thermal center diameter direction of a test sample. The measuring rod is constrained by a spring (8) which is compressed all the time so as to ensure that the contacted connection between the screw (3), the expansion rod (7) and the measuring rod of the linear displacement sensor to be tight. The device and the method are used in the fields of casting and metallurgy.
Owner:HARBIN UNIV OF SCI & TECH
Clamping mechanism suitable for tensile strength test of universal testing machine
InactiveCN107515152AEasy to installEasy to disassembleMaterial strength using tensile/compressive forcesEngineeringSelf locking
The invention discloses a clamping mechanism suitable for a tensile strength test of a universal testing machine. The clamping mechanism comprises a clamping body; an opening of the clamping body is internally provided with a wedge-shaped clamp plate; one side, away from the clamping body, of the wedge-shaped clamp plate is provided with an inner concave part; the inner concave part is internally provided with a wedge-shaped bayonet, a wedge-shaped included angle alpha of the wedge-shaped bayonet is less than a wedge-shaped included angle beta of the wedge-shaped clamp plate, and ejector rods are arranged on the wedge-shaped clamp plate; the wedge-shaped bayonet is provided with an outer convex part; the outer convex part is in halved joint with the inner concave part of the wedge-shaped clamp plate, both ends of the inner concave part of the wedge-shaped clamp plate are each provided with a mounting groove, both ends of the outer convex part of the wedge-shaped bayonet are respectively provided with through holes which are coaxial but have different diameters, and the through holes are respectively provided with a guide rod and a spring; the guide rod is inserted into the mounting grooves of the inner concave part of the wedge-shaped clamp plate, and the wedge-shaped bayonet can slide along the guide rod. The wedge-shaped clamp plate has relatively large expansion volume and wider application scope, and a test piece is easier to clamp and disassemble; when the test piece is clamped tightly, the expansion quantity of the bayonet is small, and the self locking property is strong, so the test piece is easy to clamp and lock tightly.
Owner:API ZC PRECISION INSTUMENT CO LTD
Ultra-narrow band optical filter with high optical stability and preparation method thereof
ActiveCN111308599AIncrease aggregation densityReduce signal to noise ratioFinal product manufactureOptical elementsRefractive indexThermal expansion
The invention discloses an ultra-narrow-band optical filter with high optical stability and a preparation method thereof. The ultra-narrow-band optical filter comprises a substrate and an ultra-narrow-band optical filter film arranged on the substrate. The substrate is made of FEP optical plastic, and the ultra-narrow band filter film is of a modified three-cavity structure. The film system selects a TiO2 film with a high refractive index and a SiO2 film with a low refractive index; all the film layers are subjected to ion-assisted deposition, the ion energy is 350 eV, the ratio JI / JM of the number of argon ions reaching the substrate to the number of molecules of the deposited film is greater than 0.19, and it is ensured that the aggregation density of the film layers reaches 1, so that wavelength drift caused by water absorption is eliminated. The thermal expansion coefficient of the FEP plastic reaches 140 * 10 <-6 > / degree, and a film material with a small thermal expansion coefficient and positive and negative matched refractive index temperature coefficients is selected to eliminate wavelength drift caused by ambient temperature. The ultra-narrow band optical filter can be widely applied to optical, photoelectric and laser systems and instruments to serve as a stable signal filter.
Owner:HANGZHOU KOTI OPTICAL TECH
Condensing and pumping and backpressure integrated system based on backpressure heating technique and application thereof
InactiveCN110821585AExhaust temperature riseLarge amount of expansionLighting and heating apparatusBlade accessoriesEngineeringHot Temperature
The invention discloses a condensing and pumping and backpressure integrated system based on a backpressure heating technique and an application thereof. An intermediate pressure cylinder communicateswith a low pressure cylinder through a first pipeline; the intermediate pressure cylinder communicates with a high temperature heat source heater through a second pipeline; and the low pressure cylinder communicates with a low temperature heat source heater through a third pipeline, a waterway of a heat network circulating water supply system passes through the high temperature heat source heaterand the low temperature heat source heater in sequence, and water in the waterway circularly flows from the low temperature heat source heater to the high temperature heat source heater. According tothe change of operating conditions such as the increase of the exhaust temperature and the swelling amount of the low pressure cylinder, high operating pressure of heat network circulating cooling water of a condenser and the like in a high backpressure operating mode of a steam turbine, a condenser body is redesigned, the condition of replacing a low pressure cylinder rotor twice during shutdowneach year is avoided, a novel scheme of the low pressure cylinder rotor which is suitable within a wide operating backpressure range in winter and summer is adopted, and the low pressure rotor does not need to be replaced after the system operated.
Owner:北京国电电力有限公司大连开发区热电厂
Device for fixing heating surface in supercritical tower type boiler
ActiveCN102072478ALarge horizontal heating surfaceEfficient use ofBoiler supporting/setting arrangementsHearthTower
The invention relates to a device for fixing heating surfaces in a supercritical tower type boiler. In the conventional CE technology, horizontal heating surfaces are hung by pipe clamps, angle plates and round steel hanging devices, and the expansion problem cannot be solved. The device for fixing the heating surfaces in the supercritical tower type boiler comprises that: the heating surfaces adopt tower type arrangement and are fixed above a hearth; each level of the heating surfaces in a low-temperature smoke region and a high-temperature smoke region is arranged horizontally; the heating surfaces are hung and fixed sequentially from top to bottom through hanging pipes (3); all the heating surfaces pass through a front water cooled wall or a rear water cooled wall; a heating surface pipe at the position of the water cooled wall is welded with fins of the water cooled wall; the other end expands freely; a hanging device (1) of the heating surface positioned in the low-temperature smoke region is provided with a group of upper coil pipes (4) arranged sequentially; and a hanging device (2) of the heating surface positioned in the high-temperature smoke region is provided with a group of lower coil pipes (5) arranged sequentially. The device is used for fixing the heating surfaces in the supercritical tower type boiler.
Owner:HARBIN BOILER
High-expansion-ratio structure and expansion device for deformation model
PendingCN112790568AImprove scalabilityIncrease the expansion ratioDummiesShape changeTransverse level
The invention provides a high-expansion-ratio structure for a deformation model. The structurecomprises two supports arranged in parallel, a crossed connecting rod group is arranged between the two supports, the crossed connecting rod group comprises a plurality of connecting rods hinged in a crossed manner, the connecting rods hinged in the crossed manner form a parallelogram structure, and the end parts of lower connecting rods at two ends of the crossed connecting rod group are hinged to the bottom of the bracket; and a through groove sliding rail is formed in the upper portion of the support, a sliding table connecting piece is arranged in the through groove sliding rail, and the ends of connecting rods on the upper sides of the two ends of the crossed connecting rod set are hinged to the sliding table connecting piece. The structure is characterized in that: the length of transverse and horizontal unfolding can be replaced by vertical displacement through a folding method, the connecting rods are stacked in the vertical direction in a complete contraction state, and the occupied horizontal space is extremely small, so that a plurality of groups of folding connecting rods can be mounted in a limited horizontal space by utilizing the shape change of a two-dimensional space, and the expansion range is larger.
Owner:铂悦佳业(无锡)科技有限公司
Novel expansion bolt
The invention discloses a novel expansion bolt. The novel expansion bolt comprises a screw rod and an expansion casing pipe. The screw rod is sleeved with the expansion casing pipe. One end of the screw rod is provided with a thread connected with a nut, and the other end of the screw rod is an expansion cone body. The novel expansion bolt is characterized in that a hollow columnar body is connected with the expansion cone body; a through hole is formed in the axis of the screw rod and communicated with the hollow position of the hollow columnar body; axial strip-shaped holes are formed in the circumference of the side wall of the hollow columnar body; expansion blocks corresponding to all the strip-shaped holes and capable of moving towards the outside of the strip-shaped holes are arranged in the hollow columnar body; a wedge block capable of ejecting the expansion blocks out of the strip-shaped holes is arranged in the hollow columnar body. The novel expansion bolt is of a two-level expansion structure. When the expansion amount of the expansion cone body can not be expanded firmly, the wedge block can be beaten inwards to make the expansion blocks be ejected out of the strip-shaped holes, and the expansion blocks act on the casing pipe. The expansion amount is further increased. Compared with a traditional expansion bolt, the novel expansion bolt is more suitable for modern environment-friendly building blocks of a loose honeycomb structure, concise in structure, obvious in effect and suitable for application and popularization.
Owner:太仓昂泽威建筑工程材料有限公司
Expansive agent for concrete and preparation method of expansive agent
The invention discloses an expansive agent for concrete and a preparation method of the expansive agent, and belongs to the field of expansive agent for concrete. The method comprises the steps: taking high-iron waste residues, a calcium source, an aluminum source and gypsum as raw materials, adding a mineralizer and an auxiliary fuel, uniformly mixing, adding water, and carrying out ball milling;and drying slurry, putting the dried slurry into a resistor, roasting, uniformly mixing, calcining in a high-temperature furnace to obtain concrete expansion clinker with anhydrous calcium sulfoaluminate and dicalcium aluminoferrite as main components, and mixing the concrete expansion clinker with a proper amount of gypsum to obtain the sulfoaluminoferrite expansive agent. The method is low in production cost, and the prepared expansive agent for concrete has good restrained expansion rate, high compressive and flexural strength and good comprehensive performance, and meets the performance requirements of the national standard GB / T23439-2017 'Expansive Agent for Concrete'.
Owner:SOUTHWEAT UNIV OF SCI & TECH
Research method for frost resistance of lignin-modified silty clay
InactiveCN110174431AImprove integrityImprove freeze-thaw stabilityMaterial thermal coefficient of expansionMaterial heat developmentFrostStudy methods
The invention discloses a research method for frost resistance of lignin-modified silty clay. The method comprises the following steps: S1. air drying the silty clay, and screening out granular siltyclay; S2. doping the the screened silty clay with lignin; S3. uniformly stirring silty clay samples with different lignin doping ratios, performing sealed infiltration for 12h, forming a cylindrical test piece by using a static pressure method, culturing the cylindrical test piece in a sealed manner at constant temperature and constant humidity, and then performing a freezing and thawing cycle test; S4. performing a repeated loading dynamic rebound modulus test on the test piece before and after the freezing and thawing cycle test; S5. performing a bearing ratio test on the test piece before and after the freezing and thawing cycle test; and S6. performing a heat conductivity coefficient test on the test piece before and after the freezing and thawing cycle test. By adopting the research method for frost resistance of lignin-modified silty clay disclosed by the invention, the blank of the research on the road performance of an industrial by-product in cold regions, that is, the lignin-modified silty clay, under a freezing and thawing cycle condition is filled.
Owner:JILIN JIANZHU UNIVERSITY
Clamping method applicable to tensile strength test of cylindrical part
Owner:API ZC PRECISION INSTUMENT CO LTD
Composite internal-curing shrinkage-reducing anti-cracking agent for concrete and production method of composite internal-curing shrinkage-reducing anti-cracking agent
ActiveCN113003977ALarge amount of expansionInhibition of early plastic shrinkageHydration reactionCrack resistance
The invention discloses a composite internal-curing shrinkage-reducing anti-cracking agent for concrete and a production method of the composite internal-curing shrinkage-reducing anti-cracking agent, and belongs to concrete additives. The agent is prepared from the following components in parts by weight: a modified expanding agent, acrylic acid modified polypropylene fibers, graphene oxide and a polycarboxylic acid water reducing agent. The graphene oxide is used as an adsorption point to adsorb acrylic acid modified polypropylene fibers to form a three-dimensional network branch-tendril-shaped capillary structure, and countless uniformly-distributed micro water storage tanks are formed in the concrete, so that the hydration reaction of a cementing material is promoted to the greatest extent, and the deformation performance, the crack resistance and the durability of the concrete are obviously improved.
Owner:南京派尼尔科技实业有限公司
Application method of adjustable wedge-shaped chuck for tensile strength tests
InactiveCN107478505ALarge amount of expansionEasy to clamp and lockStrength propertiesSelf lockingTensile testing
The invention discloses an application method of an adjustable wedge-shaped chuck for tensile strength tests. The application method comprises the following steps: S1, a wedge-shaped clamp plate is mounted in a clamp body opening, a wedge-shaped clamp port is formed in an inner concave part of the wedge-shaped clamp plate, an ejection rod is mounted above the wedge-shaped clamp plate, mounting grooves are formed in two ends of the inner concave part of the wedge-shaped clamp plate, a guide rod and a spring are mounted in the wedge-shaped clamp port, and the guide rod is inserted into the mounting grooves; S2, the ejection rod is started upwards to eject the wedge-shaped clamp plate up, and a test piece is placed into the wedge-shaped clamp port; S3, the ejection rod presses the wedge-shaped clamp plate, two sides of the wedge-shaped clamp plate are folded along an included angle beta, and the wedge-shaped clamp port is driven to clamp the test piece; S4, the S3 is repeated to clamp the other end of the test piece; S5, the two sides of the wedge-shaped clamp plate are opened along the wedge-shaped included angle beta, the extrusion force of the wedge-shaped clamp plate on the wedge-shaped clamp port is removed simultaneously, at the moment, the test piece is loosened by the wedge-shaped clamp port, and one tensile test process is finished. The wedge-shaped clamp plate has wider application range, the test piece is easy to clamp and dismount, the clamp port is high in self-locking performance, and the locking effect is good.
Owner:API ZC PRECISION INSTUMENT CO LTD
Noise-reducing power steering hose assembly based on high-pressure cotton threads
PendingCN107120484ALarge amount of expansionReduce noisePipe supportsFlexible pipesPower steeringSteel tube
The invention discloses a noise-reducing power steering hose assembly based on high-pressure cotton threads. A power steering tube oil inlet port and an oil outlet tube port are formed in two ends of a hose body respectively; the whole hose body comprises a power steering oil inlet steel tube and a high-pressure cotton thread power steering rubber tube; the joint of the power steering oil inlet steel tube and the high-pressure cotton thread power steering rubber tube is fixed as a whole through a buckling sleeve; a noise reducing tube is arranged in the high-pressure cotton thread power steering rubber tube through a welding lining core. The high-pressure cotton thread power steering rubber tube woven by cotton threads is large in swell capacity, the noise produced when the power steering hose assembly is used during automobile steering is small, and the customer satisfaction is improved; by means of the noise reducing tube structure added to the lining core, the noise produced when the power steering hose assembly is used during automobile steering is reduced greatly, and the customer satisfaction is improved; the impulse test of the high-pressure cotton thread power steering rubber tube can reach 0.4 million times, and the service life of the hose assembly is prolonged.
Owner:HEFEI JIANGHUAI AUTOMOBILE PIPE
An electric heating device and assembly process for simulating nuclear reactor fuel rods
ActiveCN106328226BSimulate Thermal PropertiesAccurate and controllable electric heating powerNuclear energy generationNuclear monitoringPressurized water reactorWorking temperature
Owner:NUCLEAR POWER INSTITUTE OF CHINA
Drying structure, drying tool and drying method
PendingCN113305539AAchieve fitHardness does not decreaseMetal working apparatusInterference fitEngineering
The invention belongs to the technical field of drying, and particularly relates to a drying structure, a drying tool and a drying method. The drying structure comprises a containing body and a contained body which are in interference fit, wherein a taper directional sliding structure is arranged between the containing body and the contained body, a gas escape structure communicating with an interlayer between the containing body and the contained body is arranged on a shaft shoulder of the contained body, the taper directional sliding structure comprises inclined conical surfaces which are arranged on an inner hole of the containing body and the outer circle of the contained body correspondingly and are matched with each other, the inclined conical surfaces are arranged in an inclined mode from top to bottom, the gas escape structure comprises a plurality of exhaust grooves which are uniformly distributed in the circumferential direction of the shaft shoulder of the contained body, one ends of the exhaust grooves are located on the inner side of the minimum diameter end of the inner hole of the containing body, and the other ends of the exhaust grooves communicate with the outside of the shaft shoulder of the contained body. According to the drying structure, the drying tool and the drying method, through the design of the taper directional sliding structure, the gas escape structure, a double-side induction coil and a three-point uniform pressure structure, the drying gap can be less than or equal to 0.03mm, and even complete fit without gaps can be realized.
Owner:CHANGZHOU TIANSHAN HEAVY IND MACHINERY
A Siemens 9f gas turbine combined cycle unit constant exhaust cylinder temperature clutch engagement control method
ActiveCN110284930BReduce vibrationEnsure safetyMachines/enginesSafety/regulatory devicesEngineeringMechanics
The invention relates to a Siemens 9F gas turbine combined cycle unit constant exhaust cylinder temperature clutch engagement control method, comprising the steps of: 1) using SSS clutch engagement between the unit generator and the steam turbine; 2) setting the unit lubricating oil temperature as T, T corresponds to The absolute vacuum degree of the steam turbine is P1, the ambient atmospheric pressure is P0, and before the SSS clutch engages with the steam turbine shaft, the set value of the relative vacuum degree of the steam turbine is P2; Set the relative vacuum to P2. The beneficial effects of the present invention are: the operation method of the present invention is simple and easy to implement, and does not need to make changes to the bearing pad body or the system. There is no need for equipment modification of the gas turbine unit, no additional investment costs, and simple operation. It only needs to properly break the vacuum during the start-up of the unit and increase the expansion of the #8 bearing installed in the condenser to effectively reduce the vibration during the start-up of the unit. So as to ensure the safety and stability of the unit.
Owner:ZHEJIANG ZHENENG TECHN RES INST +1
A modified calcium oxide cement concrete expansion agent and its preparation method
ActiveCN104671698BAdjustable hydration historyReduce ineffective inflationPolyvinyl alcoholMaterials science
The invention provides a modified calcium oxide expansive agent used for cement concrete and a preparation method thereof. The modified calcium oxide expansive agent used for cement concrete comprises polyvinyl alcohol and a calcium oxide expanding clinker, wherein the surface of the calcium oxide expanding clinker is coated with polyvinyl alcohol. The modified calcium oxide expansive agent used for cement concrete has the beneficial effects that the hydration process of the calcium oxide expanding clinker can be regulated; invalid hydration at the plastic stage of concrete is reduced, the expansion quantity after hardening is increased and the shelf life of the product is prolonged; the modified calcium oxide expansive agent used for cement concrete can be used for crack and seepage resistance of a concrete structure and can substantially improve the durability of concrete.
Owner:JIANGSU SOBUTE NEW MATERIALS +1
New expansion bolt
Owner:太仓昂泽威建筑工程材料有限公司
A kind of composite internal curing shrinkage reducing and anti-cracking agent for concrete and production method thereof
ActiveCN113003977BLarge amount of expansionInhibition of early plastic shrinkageHydration reactionPolymer science
Owner:南京派尼尔科技实业有限公司
Welding method of electronically controlled grid welding tool
ActiveCN106216788BFully osmotic diffusionLarge amount of expansionSoldering auxillary devicesMicrowaveElectron gun
Owner:HUADONG PHOTOELECTRIC TECHN INST OF ANHUI PROVINCE
Sealing device and mechanical sealing packer
ActiveCN102094593BLarge amount of expansionPlay a protective effectSealing/packingEngineeringTemperature resistance
The invention provides a sealing device and a mechanical sealing packer, the sealing device comprises an upper open block, a hydraulic medium, a bimetal convex-concave spring and a lower open block, wherein the bimetal convex-concave spring comprises red copper and a convex-concave spring, the red copper is laid and welded on the surface and the side surface of the convex-concave spring, the bimetal convex-concave spring is arranged vertically, the hydraulic medium is placed in the bimetal convex-concave spring, and the upper open block and the lower open block for extruding and closing the hydraulic medium are respectively connected above and below the hydraulic medium; the mechanical sealing packer is provided with the sealing device; and the sealing device and the mechanical sealing packer provided with the sealing device have the characteristics of high temperature resistance and high pressure resistance, and have very important production practical significance in exploitation process of thick oil.
Owner:通化红光石油机械有限责任公司
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