Process for welding vacuum freeze dryer plate layer

Abstract

The invention belongs to the technical field of pharmaceutical machinery, and particularly relates to a process for welding a vacuum freeze dryer plate layer. The process is characterized by comprising the following steps of: horizontally placing an upper panel (1) on an energy storage resistance welding lower electrode plate (3), and welding a plurality of groups of supporting posts (2) side by side in parallel on the upper surface of the upper panel (1) by using energy storage resistance welding; forming process holes (7) at intervals on single side on two opposite sides of a parting stop (5); outwards stamping convex points (6) on the opposite lateral surface of the process holes (7); sheathing parting stops (3) on each group of supporting posts (2) in parallel through the process holes (7); and welding the upper and lower panels (1 and 8) and the parting stops (5) together by using the energy storage resistance welding respectively. The energy storage resistance welding principle is adopted in the welding process, so the process is simple; and the upper and lower surfaces of the welded plate layer have no damage, the thickness of the panels is uniform, deformation or welding spot leakage is not easily caused, and the plate layer has high welding strength and good fatigue strength resistance and heat resistance.

Description

technical field [0001] The invention relates to a welding process of a plate layer of a vacuum freeze dryer, which belongs to the technical field of pharmaceutical machinery, and in particular relates to a welding process of a plate layer of a vacuum freeze dryer. Background technique [0002] The internal structure of the vacuum freeze dryer plate is hollow, and the middle is filled with a heat-conducting medium. In order to ensure that the heat-conducting medium can flow evenly in the plate, there are spacers inside to form a "maze". At present, domestic manufacturers mainly use three processes to weld the plate of the vacuum freeze dryer. [0003] One is the "plug welding" technology, that is, "perforated welding". Weld the spacers with the upper and lower surfaces of the ply. Although this technology is simple in processing and low in cost, the method of processing the solder joints after welding makes the thickness of the ply panel uneven. During the welding process T...

AI Technical Summary

Problems solved by technology

"High temperature vacuum brazing" overcomes the shortcomings of "plug welding" and "internal welding method", but due to the great difference in the physical properties (thermal expansion coefficient) of the brazing material and the stainless steel base material, and the temperature of the plate layer is - Repeated alternating changes between 40°C and 120°C, so the fatigue strength is very limited

And the equipment is expensive, the process is complicated, and it is difficult to detect

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