65results about How to "Reduced risk of bursting" patented technology

The invention discloses an automatic pressure relief type single-mode microwave reaction system and belongs to the field of analytical instruments. The system is composed of a magnetron, a single-mode cavity assembly, a single-mode sealing cover assembly, a sealing cover slide assembly, a test tube assembly, a magnetic stirring assembly, an automatic pressure relief assembly, an infrared temperature measurement assembly and a single-mode cavity lifting assembly. Because the automatic pressure relief function is integrated in the system, the test tube burst risk in the reaction process is greatly reduced, and the reliability of the chemical microwave reaction system is improved; in the digestion process, if the test tube interior pressure is higher than a preset safety pressure value, the system can automatically relieve pressure, the safety of the digestion process is guaranteed, and after the test tube interior pressure is reduced to be less than the preset safety pressure value, the system can continuously restore a seal operating state. After the digestion is completed, the system can be automatically cooled and then relieve pressure and is uncovered, and the whole digestion process is rapid, safe and reliable. The automatic pressure relief type single-mode microwave reaction system can be widely applied to the field of design and manufacture of microwave reaction devices.

The invention discloses a high strength sprayed concrete for high ground temperature tunnels and a preparation method thereof. The concrete comprises following raw materials: cement, fly ash, slag powder, sand, coarse aggregate, glass beads, PVA fibers, steel fibers, modified rubber, a water reducer, a setting accelerator, and water. Low melting point water-soluble PVA fibers are adopted, after concrete reaches the melting point of the PVA fibers, fibers are melted, tunnels are formed, thus water steam in the concrete can be conveniently dissipated through the tunnels, the steam pressure in the concrete is reduced, the risk of bursting is reduced, at the same time, the melted water-soluble PVA fibers can largely enhance the inner cohesive force of concrete, and the cracking of a cement face is avoided. Through the cooperation of all raw materials, the prepared concrete has the characteristics of low heat conductivity coefficient, good anti-permeability, high interfacial bond strength,and little long-term strength loss. The long-term strength of concrete after spraying is largely improved. The cracking of high ground temperature concrete is avoided.

The invention provides an air curtain protection device for laser cleaning and a protection method and can effectively collect pollutants in laser cleaning, guarantee cleanliness of a laser lens and prevent lens glass from being broken and damaged. The air curtain protection device for laser cleaning comprises a protection cover, a first air outlet array, a suction port and a second air outlet array, wherein the protection cover is provided with a horn-shaped inner chamber with a thin upper part and a thick lower part, the upper end of the inner chamber is in sleeve joint with the laser cleaning lens, and an opening is formed in the lower end of the inner chamber; the first air outlet array is formed in the side wall of the inner chamber, and protection space surrounding the laser lens is formed by compressed air exhausted by the first air outlet array and side walls; the suction port is formed sideways below the protection cover; the second air outlet array is formed in the peripheral edge of the lower end of the inner chamber, compressed air exhausted by the second air outlet array surrounds a laser irradiation area on the surface of a cleaned workpiece, and projection of air flow at each air outlet of the second air outlet array on the horizontal plane points to the suction port.