43results about How to "Flexible heating method" patented technology

The invention discloses an aluminum alloy seal structure local flame heating ultrasonic braze welding method which is used for conducting sealing and braze welding encapsulation on aluminum alloy cavities of built-in electronic components. The aluminum alloy seal structure local flame heating ultrasonic braze welding method comprises the first step of polishing and clearing an aluminum alloy surface of a joint to be brazed through abrasive paper; the second step of placing low-temperature Sn-based brazing filler metal on one side of the lap joint end of an aluminum alloy sealing surface; the third step of conducting local reciprocating heating on the brazing filler metal through gas flame flow to make the brazing filler metal melt and maintain a liquid state, and no heating on parent metal; the fourth step of applying ultrasonic vibration on a cavity of the aluminum alloy to be welded; the fifth step of finishing sealing the test piece through natural cooing after the ultrasonic vibration is finished. According to the aluminum alloy seal structure local flame heating ultrasonic braze welding method, overall heating is not conducted when the aluminum alloy seal structure is welded, local heating is conducted only on the brazing filler metal area, heating on a sealing element is extremely small, and the electronic components in the sealing element are not affected by heat. The aluminum alloy seal structure local flame heating ultrasonic braze welding method has the advantages of being simple in technology, high in welding efficiency, and suitable for the engineering application.

The invention discloses a method for using an infrared nondestructive flaw detection device for modified asphalt pavement, a method for using an infrared nondestructive flaw detection integrated dual-purpose device for modified asphalt pavement, comprising the following steps: closing the screen door, according to the material properties Select electromagnetic excitation heating or microwave excitation heating; close the excitation device, stop heating, control the excitation plate to move to both sides, open the screen door; open the infrared camera to take pictures of the heating unit. For the conversion of excitation and microwave excitation, different excitation heating methods can be selected according to different modified asphalt pavements. When the modified asphalt pavement is added with soft magnetic particles, magnetite powder, activated carbon, carbon nanotubes, graphene and other modified materials Microwave excitation can be selected; electromagnetic excitation is used when adding modified materials such as metal and carbon to the modified asphalt pavement. The heating method is flexible, one method is dual-purpose, and the application range is wide.

The invention discloses a method for transporting asphalt mixture for expressway, which comprises the steps of counting the number of transport vehicles, determining the traveling route, preheating the transport vehicles, spraying lubricant, loading, heat preservation, transportation, cleaning and the like. The number of transport vehicles is determined according to the production capacity, transportation time and consumption of the mixing plant, and additional safety reserve vehicles can avoid paving material breakage. Measures such as preheating of the transport vehicle, spraying lubricant and heat preservation can minimize the probability of segregation of the asphalt mixture, improve the quality of the asphalt mixture, improve the quality of the asphalt pavement, prolong the service life of the pavement and reduce the maintenance cost in the later period effect.

The invention discloses a method for preparing broadband reflective cholesteric liquid crystal film by photothermal response technology. Copper sulfide nanoparticles modified by polyvinyl alcohol were first synthesized, and the nanoparticle aqueous solution was drip-coated on a glass substrate and dried on a hot stage to make a photothermal film, and the glass substrate with this photothermal film was used as a liquid crystal One side of the cell is made into a liquid crystal cell with photothermal response performance to the near-infrared light band. Mix nematic liquid crystal, chiral compound, polymerizable monomer, and photoinitiator uniformly according to a certain mass ratio to obtain cholesteric liquid crystal, pour it into the prepared liquid crystal cell with photothermal response performance, and place it in the near-infrared laser Under the irradiation, the sample is irradiated with ultraviolet light at the same time, so that the polymerizable monomer is polymerized during the heating process, and broadband reflection is realized. The preparation method of the copper sulfide nanoparticles modified by polyvinyl alcohol and the liquid crystal cell with photothermal response performance of the present invention is simple, and different heating speeds can be realized by modulating the intensity of the near-infrared laser, and has the advantages of strong flexibility and low price .

The invention discloses a device for non-destructive detection of infrared road diseases by emitting electromagnetic waves or microwaves, which includes an infrared camera, a rotating device and a shielding device. The shielding device includes a first side shield and a second side shield. The first side shield and the second side shield are respectively located on both sides of the rotating device, the infrared camera is located directly above the rotating device, and the rotating device constitutes a bottomless box-shaped device. The heating method of the present invention is flexible and adaptable. It can decide whether to use electromagnetic induction heating or microwave heating according to the different pavement materials, and uses electromagnetic waves or microwaves to quickly heat pavement materials efficiently by using the magnetic concentration and reflection effects, and solves the problem of infrared road heating. In non-destructive testing technology, pavement materials have strict requirements on heating methods and temperatures.

The invention discloses a communicated heat-locking device. The top of an internal valve box body (1) is provided with an upper air inlet port (3), the bottom of the internal valve box body (1) is provided with an air inlet cap (2) with a lower air inlet pore (4), a piston is formed by arranging a piston cap (7) on a piston boit (8) and is arranged in the internal valve box body (1) with the support from a spring (5), the piston cap (7) seals the upper air inlet port (3), and the piston boit (8) extends out of the lower air inlet cap (2); the bottom of an external valve box body (9) is provided with a lower exhaust hole (11), the top of the external valve box body (9) is provided with an upper exhaust ring (10) with an upper exhaust hole (12), the internal valve box body (1) is arranged in the external valve box body (9) with the support from a spring (6), and the piston boit (8) extends out of the lower exhaust hole (11) of the external valve box body (9). The heat-locking device of the invention has the advantages of simple structure, combination of air exhaust and air admittance, flexible heat-locking mode, reduced heat lost, improved heat efficiency and excellent heat insulation effect.