In recent years, with the promotion of energy saving and emission reduction, light weight and environmental protection in China, more and more aluminum alloy die casting technology is used in automobile manufacturing to produce the required components, such as gearbox housing, front cover housing, gearbox valve plate and engine...
The driving device adopts direct push electro-hydraulic push rod. The speed of the electro-hydraulic push rod is fast, up to 110 mm / s. It can adjust the speed, stroke and pushing force according to different working conditions. It has self-locking and overload automatic protection functions. The electro-hydraulic push...
The inside of valve plate also needs pouring refractory layer, and the minimum width of valve plate is determined according to the thickness of refractory layer. In order to avoid the heat transfer effect of the blind hole panel leading to the sealing performance reduction of the sealing ring,...
In order to isolate the high temperature of the pipeline, the high temperature resistant lining is poured inside the cylinder of the valve body (Fig. 1). The lining material is high alumina cement refractory castable. The fire resistance of the high alumina cement refractory castable can reach 1600 ℃...
Because of its low manufacturing cost and good comprehensive performance, steel castings are often used in the plug valve of thermal power plant. Because of its long-term operation under the harsh conditions of high temperature, high pressure and vibration, and large thick wall castings usually have some internal defects...
A temperature controller is used for welding preheating and post weld heat treatment. The output number corresponds to the output cable number. The thermometer, recorder and thermocouple shall be verified to be qualified before use. (1) heater layout. Both preheating and post weld heat treatment adopt 10kW far-infrared crawler...
The welding method is manual arc welding, welding material grade tgs-9cb, welding rod diameter 3.2 mm, welding current 90-120 a, welding voltage 20-24 v. The whole valve body is preheated by crawler type flexible ceramic resistance heater, and the preheating temperature is (200 ~ 250) ℃. The bottom welding,...
Defect excavation and repair On site, electric grinding wheel is used to eliminate defects, and the metal luster is exposed within 20 mm of the surface and periphery of the defects, and the root should be smooth transition, so as to avoid the existence of dead corner which is...
The boiler equipment of 3 × 350 MW supercritical unit in a power generation company is provided by Dongfang Boiler Works. The boiler is a spiral tube coil once through boiler with supercritical parameters and variable pressure operation, single furnace, one intermediate reheat, front and rear wall opposed combustion...
Welding preparation (1) in order to prevent the hardened layer and carburized layer produced in the repair welding groove during the crack excavation process, the mechanical method is used instead of the faster carbon arc air gouging method. According to the depth of crack excavation, the groove is repaired...