Welding method for freeze drier board layer and freeze drier board layer

Abstract

The invention discloses a welding method for a freeze drier board layer. The board layer comprises an upper board, a lower board, edge steel and square tubes. The square tubes are welded between the upper board and the lower board, and the upper board, the lower board and the square tubes are welded and fixed through a plasma arc welding method. The freeze drier board layer manufactured through the welding method comprises the upper board, the lower board and the edge steel. The four pieces of edge steel is arranged at the ends between the upper board and the lower board, the upper board and the lower board are welded and fixed through the edge steel to form a body of the board layer, the square tubes are arranged between the upper board and the lower board and provided with inner cavities, the ends, connected with the edge steel, of the square tubes are provided with slopes making the inner cavities communicated with the external environment, and multiple circulating cavities are formed in the body.

Description

technical field [0001] The invention relates to the field of medicine and food packaging machinery, in particular to a welding method for a freeze dryer plate and the freeze dryer plate. Background technique [0002] At present, in the production method of the freeze dryer plate layer, the welding methods generally adopted are: manual tungsten argon arc welding, vacuum furnace brazing and drilling plug welding. The three welding methods are as follows: [0003] Manual argon tungsten arc welding: the welding speed is slow, the deformation after welding is large, and the labor intensity of the workers is high, and the weight of the whole plate after welding is heavy; [0004] Vacuum furnace brazing: After welding, the weight of the whole plate is reduced, the welding quality is high, the material is heated evenly during the welding process, the welding deformation is small, the surface finish of the plate after welding is easy to handle, and the working cycle of surface treat...

AI Technical Summary

Problems solved by technology

[0003] Manual argon tungsten arc welding: the welding speed is slow, the deformation after welding is large, and the labor intensity of the workers is high, and the weight of the whole plate after welding is heavy;

[0004] Vacuum furnace brazing: After welding, the weight of the whole plate is reduced, the welding quality is high, the material is heated evenly during the welding process, the welding deformation is small, the surface finish of the plate after welding is easy to handle, and the working cycle of surface treatment is shortened, but the welding The use period is long, and the welding process is complicated, the input cost is high, and the risk of brazing layers is relatively high. When welding multiple layers in each furnace, if there is a slight mistake, it can cause great economic losses;

[0005] Drilling plug welding: Two overlapping workpieces are connected by drilling. When drilling, pay attention to the thickness of the plate, and also consider the thickness of the fitting workpiece. The diameter of the drilling is directly related to the difficulty of welding. A little carelessness will affect the quality of the welding. This welding method is relatively backward, and the deformation after welding is large. The position accuracy of the drill hole is required to be high. The melting of the root during welding needs special guarantees, otherwise it will be desoldered during the pressure test. , resulting in an increase in the thickness of the upper and lower boards to be used. Because the solder joints are deformed after welding, the overall plane needs to be machined to remove the uneven parts, resulting in waste of materials and prolongation of the working cycle.

Images