274results about How to "Reduce the temperature difference between inside and outside" patented technology

The invention discloses a mass concrete temperature intelligent monitoring and controlling device, which comprises a circulating pipeline formed by sequentially connecting a water supply device, a water distribution device, a concrete cooling system and a water return device, wherein the concrete cooling system is internally provided with a temperature monitoring device; and a centralized controlsystem which is respectively connected with the water supply device, the water distribution device, the concrete cooling system and the water return device. The concrete cooling system comprises a cooling water pipe arranged in the concrete. Usage of the device comprises a concrete cooling system setting step, a monitoring device setting step, a water distribution device setting step, a water supply device setting step, a water return device setting step, a mass concrete construction preparation step, a data acquisition step, a water supply pressure stabilization step, an alarm step, a hot water tank drainage step and a cold water tank water replenishing step. By the adoption of the mass concrete temperature intelligent monitoring and controlling device, water supply pressure can be stabilized, different water inlet temperatures and flow rates of each layer can be dynamically adjusted, temperature field change in the mass concrete can be developed according to a target of temperature control, and an alarm function is equipped, so that the problems that a temperature difference of each region of the mass concrete is too large and cracks are easy to generate are solved.

The invention provides a controller capable of automatically adjusting parameters of equipment. The controller comprises a communication module, a detection module, an infrared module, a storage module and an MCU (microprogrammed control unit), the MCU is connected with the communication module, the detection module, the infrared module and the storage module respectively, the detection module is a parameter sensor, the storage module stores parameters taking time and the parameters as coordinate axes and parameter curves corresponding to the time, the parameter curves are transmitted through an input information component out of the equipment and received through the communication module prior to being transmitted to the storage module via the MCU, the parameter sensor senses the parameter values on the periphery of the point where the controller is located and transmits the parameter values to the MCU, and the MCU automatically calculates difference values according to corresponding target parameter values of corresponding time point of the storage module and transmits the difference values to the equipment via the infrared module to perform adjustment. By the controller, the parameters of the equipment can be adjusted in real time so as to meet environmental parameter requirements preset by users, comfort required for a human body can be created, and energy-saving performance of the equipment during use can be improved.

The invention discloses C70 mass concrete. The C70 mass concrete is prepared from the following components by mass: 140 to 170 parts of water, 400 to 450 parts of cement, 1,000 to 1,200 parts of crushed stone, 550 to 650 parts of gravel, 70 to 110 parts of coal ash, 60 to 90 parts of mineral powder, 30 to 70 parts of silica fume, 8 to 10 parts of a pumping agent, 35 to 45 parts of an anti-crackingagent, and 0.3 to 0.4 part of an internal curing agent. The invention also discloses a preparation method for the C70 mass concrete. The method comprises a first step of uniformly mixing sand, graveland water and a second step of adding other components and carrying out uniform mixing under stirring. According to the composition of the mass concrete in the invention, mineral powder, silica fumeand fly ash are used as mineral admixtures and can delay the release rate of cement hydration heat and reduce the shrinkage and deformation of the concrete, and the mineral admixtures acts synergistically with the other components to inhibit the generation of cracks at the same time; and the preparation method of the invention is simple in process and easy to implement.

The invention discloses a manufacturing method of an FB2 valve forged piece for an ultra-supercritical turbine. The method comprises the following steps of smelting, forging, valve forged piece heat treatment, machining and heat treatment. The invention further discloses a valve forged piece manufactured by the adoption of the manufacturing method of the FB2 valve forged piece for the ultra-supercritical turbine. According to the manufacturing method, operation is reasonable, effective boron is contained, hardenability of the forged piece reaches the standard, the grain size of the final forged piece is larger than or equal to the grade 3, and according to the manufacturing method of the FB2 valve forged piece for the 625 DEG C ultra-supercritical turbine and the FB2 valve forged piece, the situation that Y-shaped cracks appear in the center of the forged piece is avoided.

The invention relates to a food nutrition freezing method. The food nutrition freezing method comprises the following stages at least: (1), a cooling stage, namely cooling food materials at a coolingrate of 2 DEG C/minute or below until a critical freezing temperature point is reached, and entering the next stage; and (2), a first freezing stage, namely rapidly lowering the temperature of the food materials to N DEG C within 30 minutes, wherein N is equal to or higher than 5 DEG C below zero and equal to or lower than 1 DEG C below zero. Compared with the prior art, muscle tissue contractioncaused by coldness is prevented in the cooling stage, and ice crystals are formed inside and outside cells, wherein the formed ice crystals are tiny so that damages to tissues are small; and thus, nutritional quality of the foods is improved.

A prefabrication method capable of preventing mass concrete components from cracking comprises steps as follows: modeling, concrete configuration, pouring, curing and form stripping. The temperature difference between inside and outside of mass concrete is effectively reduced while design strength requirements of a prefabricated component are met through optimization of structure sizes, selectionof high-quality cement, reasonable use of a mineral additive and reasonably graded aggregate, initially set matching rate calculation and test of the concrete as well as measures including concrete temperature stress, heat insulation temperature rise checking calculation and the like, so that the problem of cracking of prefabricated mass concrete components is solved.

The invention provides a good mattress capable of preventing dewing and dispensing, characterized in that: the thermal plasticity resin as the raw material or the main raw material melts to be extruded into lines and a large amount of lines are wounded out of order and welded into annular aggregates of the lines and the aggregates are formed into the plate-like shape and then cooled and solidified, therefore a three-dimensional net structure is formed. The left, right relatively-long side-surfaces have side-surface firmness parts with high apparent density.

Disclosed is a tunnel lining concrete heat preserving and maintaining construction device. The tunnel lining concrete heat preserving and maintaining construction device is characterized by comprising a first trolley, a second trolley and a third trolley which are sequentially connected, or comprising a first trolley and a second trolley which are sequentially connected, or comprising a second trolley and a third trolley which are sequentially connected, or comprising a first trolley and a third trolley which are sequentially connected, wherein the three trolleys are each provided with a template supported through a supporting rod. The tunnel lining concrete heat preserving and maintaining construction device has the advantages that the three construction trolleys conduct heat preservation on secondary lining at first, the temperature difference between the interior and the exterior is decreased, then, heat preservation and moisture retention are carried out on concrete, concrete frost heaving is avoided, and finally the concrete is slowly cooled through a cooling layer, so that the quality problem generated by the large temperature difference between pre-construction and post-construction is avoided. The tunnel lining concrete heat preserving and maintaining construction device has the advantages of being stable in construction quality and low in manufacturing cost and has the wide market prospect.

The invention relates to a method and device for progressive austempering heat treatment of bainite and martensite complex-phase steel/iron, and belongs to the technical field of metallic material heat treatment processes. The method comprises the following steps: performing water cooling on an austenitized workpiece for a certain period of time, taking out the workpiece for air cooling, and enabling the inner and outer temperatures of the workpiece to be close to each other by using waste heat temperature returning, thereby finishing a heat treatment cycle; putting the inner and outer parts of the workpiece into a lower bainite transformation temperature zone after finishing multiple heat treatment cycles; then performing isothermal transformation by using waste heat temperature returning or heat preservation by an insulation can; and finally performing air cooling to finish martensite transformation. By adopting the method, the defect that a workpiece with a relatively large wall thickness is easy to crack and generate early cracks during quenching can be overcome, and the obtained product is uniform in structure, good in comprehensive mechanical property, reliable in operation and low in cost and is green and environmentally-friendly.

The invention discloses a process method for reducing vacuum brazing defects of a 6061 aluminum alloy and a clamp. The clamp comprises an upper cover plate (2) and a lower cover plate (1) connected through a vertical rod (7); an upper stainless steel plate (4), a spring (5) and a gasket (3) are successively arranged below the upper cover plate (2); and a lower stainless steel plate (6) is arrangedabove the lower cover plate (1). According to the process method and clamp disclosed by the invention, curves of temperature-raising, insulating and cooling processes are adjusted during brazing. Thecold plates can be domesticated by adopting the processing method and the clamp, the vacuum brazing defects of the 6061 aluminum alloy are reduced greatly, the product quality is improved, and meanwhile the international image of an enterprise is enhanced.

The invention provides a thermal fatigue testing machine which is characterized by comprising a support and a thermal fatigue testing specimen, wherein the support is of a support pillar structure with an upper flange and a lower flange; the center of the support is provided with a support cooling water channel; the upper part of the thermal fatigue testing specimen is clamped at the upper flange of the support, while the lower part of the thermal fatigue testing specimen is clamped at the lower flange of the support; and the outer wall of the thermal fatigue testing specimen is wound with an induction heating coil. The thermal fatigue testing machine is reasonable in structure, scientific in operation, remarkable in effects and suitable to popularization and application in the field of thermal fatigue testing.

The invention discloses anti-cracking concrete, which is prepared by mixing the following components in parts by weight: 240-315 parts of cement, 635-705 parts of gravels, 410-515 parts of modified recycled aggregate, 715-835 parts of sand, 140-185 parts of water, 5-9 parts of a water reducing agent, 80-125 parts of fly ash, 18-25 parts of borax and 25-35 parts of modified combined fibers, whereinthe preparation method of the modified recycled aggregate comprises the following steps: mixing 65-75 parts by weight of water glass with a mass concentration of 5%, 12-18 parts by weight of an organic silicon resin and 4-8 parts by weight of borax to obtain an aggregate modification solution, soaking recycled aggregate into the aggregate modification solution for 30-40 minutes, taking out, and draining to obtain the modified recycled aggregate, and the preparation method of the modified combined fibers comprises the following steps: mixing 15-27 parts by weight of polyvinyl alcohol and 35-50parts by weight of water, carrying out heating melting, adding 2.4-3.2 parts by weight of polyethylene glycol, stirring to obtain a fiber modified solution, uniformly mixing polypropylene fibers andcarbon fibers according to a weight part ratio of (4-5):1, immersing into the fiber modified solution for 1-2 hours, taking out, and draining to obtain modified combined fibers. According to the invention, the anti-cracking concrete has characteristics of improved impact resistance, improved splitting strength and cracking reducing.

The invention discloses a system and method for preparing crude cyanuric acid continuously by using urea. The system comprises: a differential stirring reactor for receiving urea melt and for deaminating it to produce crude cyanuric acid; a heating device disposed outside a reaction barrel of the differential stirring reactor and used for heating the reaction barrel; an ammonia recycling device connected with a gas outlet of the differential stirring reactor and used for recycling ammonia as a material for urea synthesis. The system and method enable continuous feeding, automated temperature control and automated discharging, rarely cause equipment blockage and blocking, reduce operation intensity of workers and improve work environment, optimize an operation process, and provide an organic integrity of human, machinery, material, process and environment.

The invention relates to a GH864 high-temperature alloy die forging method. The GH864 high-temperature alloy die forging method comprises the following steps: a forging blank is fed in a heating furnace, the heating furnace is heated up to a forging temperature T according to convectional forging heating parameters, and the temperature T is kept by S1; the forging blank is taken out from the heating furnace, is wrapped with an insulation material, and is fed in the heating furnace for insulation again, the temperature of the heating furnace is higher than the temperature T by 10-20 DEG C, and the lasting time is 100-160 min; and the blank is discharged from the furnace, and the forging blank and the external insulation material are both fed in a forging machine for die forging until a forging is molded. The high-temperature alloy die forging method wraps the insulation material out of the heated forging blank to prevent quick lowering of the surface temperature of the blank to reduce internal and external temperature difference of the blank; the finally produced forging is uniform in structure and dense in grains; the crystal mixing phenomenon is obviously improved; and the product performance is improved.

The invention relates to C60 ultrahigh pumping concrete. The C60 ultrahigh pumping concrete is prepared from the following raw materials in parts by weight: 350 to 370 parts of P.O42.5-grade cement, 66 to 74 parts of S95 mineral powder, 48 to 52 parts of F(I) coal ash, 75 to 85 parts of high-performance mineral admixture, 725 to 765 parts of sand, 930 to 970 parts of 5 to 20 mm particle-size gravel, 8.0 to 9.0 parts of additives, and 151 to 163 parts of water. The concrete not only has good mobility, but also meets the strength requirement of C60 concrete; and the internal heat conduction efficiency of the pouring molded concrete is high, the surface of the concrete in the hardening process hardly has a crack, and the safety potential hazard is reduced.

The invention discloses a cooling heat pipe heat exchanger of an alumina decomposer, and the cooling heat pipe heat exchanger comprises a cooling section and a heated section, wherein the heated section is arranged at the lower part of the cooling section; the cooling section comprises an inner pipe and an outer jacket pipe, a water inflow pipe interface is welded to the lower part of the outer jacket pipe and a water outflow pipe interface is welded to the top of the outer jacket pipe; and the heated section is integrated with the inner pipe, and the heated section is characterized in that acylindrical metal wire net is arranged inside the heated section and a certain distance exists between the outer wall of the cylindrical metal wire net and the pipe inner wall of the heated section. In the cooling heat pipe heat exchanger of the alumina decomposer disclosed by the invention, the cylindrical metal wire net is arranged in the heated section, so that the fluid backflows in the cylindrical metal wire net and does not directly contact with the pipe wall of the heated section, thereby the temperature difference between inside and outside of the pipe wall of the heated section is reduced, scabbing on the pipe outer wall of the heated section is prevented, the heat transfer efficiency and work efficiency are greatly improved, and the service life of the cooling heat pipe heat exchanger disclosed by the invention is prolonged.