3results about How to "Prevent thermal cracking" patented technology

The invention relates to the technical field of operation and maintenance of photovoltaic power generation equipment, and discloses a spraying integrated device for cleaning a photovoltaic panel and a control system, and the spraying integrated device comprises a box body, a water conveying assembly, a water supplementing assembly and a controller. An electric hydraulic rod, a pressing plate, a water storage sponge and an isolation plate are arranged in the box body, and a light attenuation analysis unit is arranged on the side wall. The controller controls the hydraulic rod to extrude the sponge to release water flow through the isolation plate according to the smudginess degree fed back by the light attenuation analysis unit and data of the water level sensor. The system adopts a pulse extrusion strategy to control a hydraulic rod to stretch out and draw back in a reciprocating and micro-amplitude manner, so that sponge releases fluctuating water flow to strip stubborn stains; and meanwhile, high-temperature protection logic is provided, a cleaning instruction is locked according to ambient light intensity, and hidden cracks of the photovoltaic panel caused by cold water spraying at high temperature are prevented. The problem that detection and operation areas are not matched is solved through integrated design, sponge extrusion is used for replacing high-pressure spraying to prevent a coating from being damaged, and the cleaning efficiency and safety are improved.

This invention discloses a high-elongation cast Al-Cu-Zn-Mg alloy with good resistance to hot cracking. The alloy composition, by mass percentage, includes: Cu 3.5–4.5%, Mg 0.4–1.5%, Mn 0.2–0.5%, Ti 0.10–0.2%, Zn 2.5–3.5%, with the balance being Al and unavoidable impurity elements. Addressing the limitations of existing Al-Cu casting alloys, such as wide solidification temperature range, poor fluidity, and hot cracking, this invention provides a high-Zn-content Al-Cu-Zn-Mg alloy with good resistance to hot cracking. This alloy has a low melting point, a narrowed solidification temperature range, and excellent resistance to hot cracking and mechanical properties. It can be used for various high-strength cast aluminum alloy structural parts, effectively avoiding casting defects such as hot cracking, shrinkage cavities, and porosity, and significantly improving the overall mechanical properties of the alloy.

The application relates to the technical field of concrete construction, in particular to a concrete construction equipment and a construction method thereof under a low-temperature environment. The concrete construction equipment comprises a heat preservation shed assembly, a heat equalizing assembly, a temperature control assembly, a flow equalizing assembly and an adjusting assembly. The heat preservation shed assembly comprises a support framework arranged in a straight line array, an inner tent cloth arranged on the inner wall of the support framework and an outer tent cloth arranged on the outer wall of the support framework. The heat equalizing assembly comprises a partition plate arranged on the outer wall of the support framework, a steam cover arranged between the support framework and the outer tent cloth and a ventilation hole arranged on the outer wall of one end of the partition plate. The temperature control assembly comprises a heat-sensitive tank arranged on the inner top of the inner tent cloth. The flow equalizing assembly comprises a rotating frame arranged on the outer periphery of the heat-sensitive tank, a turbulence fan blade arranged on the outer wall of the rotating frame and a turbine fan blade arranged in the steam cover. The adjusting assembly comprises a movable baffle plate arranged on the opening of the steam cover. The partition plate divides the interlayer of the inner tent cloth and the outer tent cloth into a plurality of independent cavities, and the ventilation holes on the adjacent partition plates are staggered.