Digital display precision flow controllable and adjustable multi-column aluminum heat exchanger flame brazing equipment

Abstract

The invention discloses torch soldering equipment which is used for linearly moving on a rail and is used for soldering the U-shaped tube of an all aluminum heat exchanger. The equipment is composed of an electric control unit, a material feeding area, a welding and heating area, a blanking area and a pneumatic control unit. Under the condition that liquefied petroleum gas (LPG), air, cooling water, a power supply and the like are switched on as required, the existing product specification (technological parameters, such as chosen transmission link speed, flame size and the like) is chosen, and then, ignition is carried out to start a conveyor, and a conveying chain is operated under a constant speed. Workpieces (parts and welding rings which are assembled as required) which need to be welded are continuously put in the material feeding area to a conveying link plate; products are conveyed to two sides of a welding area by the conveying link plate automatically at a constant speed to be heated and welded by symmetrical fire row flames; then the products are conveyed to the blanking area; and the products are continuously unloaded from a conveying link in the blanking area and simultaneously a welding effect is monitored.

Description

technical field [0001] The invention relates to a brazing equipment, which is used for automatic and continuous flame brazing of U-shaped tubes of all-aluminum heat exchangers while moving linearly on rails. Background technique [0002] In many published literatures, the automatic and continuous flame brazing of aluminum and aluminum alloy U-shaped tubes of all-aluminum heat exchangers has always been an unresolved problem. This is because: 1) If the aluminum-silicon solder with high air tightness (such as 4047, 4043 solder) is used, its melting point is high (the solidus temperature is about 577°C, and the liquidus temperature is about 590-600°C ), the brazing temperature generally needs to be controlled at 610-620°C, while the melting point of pure aluminum is 660°C, and the melting point of aluminum alloy is lower than 660°C, so it is difficult to make the solder in the range of only about 40°C (such as 4047, 4043 brazing material) melt and fill the brazing seam, but al...

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Problems solved by technology

[0003] In order to solve the above problems, in recent years, Zn-Al-(Ag) solder has been developed at home and abroad. Its melting point is only about 380°C, which is very suitable for automatic and continuous flame brazing of aluminum and aluminum alloy U-shaped tubes, but its " The "leakage rate" is very high and cannot be solved from the material itself. Therefore, experts at home and abroad have lost confidence in Zn-Al-(Ag) solder and believe that it is not suitable for brazing of all-aluminum heat exchangers

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