Hot air reflow furnace

Abstract

The invention relates to a hot air reflow furnace. The hot air reflow furnace comprises a furnace frame, an upper hearth, a lower hearth and a transport system, wherein the upper hearth, the lower hearth and the transportation system are installed on the furnace frame. The upper hearth is provided with a hearth body and a fan, the hearth body is provided with an inner container and an outer container, a high pressure zone is formed in the inner container, and a low pressure zone is formed in the outer container; the inner container is provided with a recycling vent, the recycling vent is connected to a filtering device outside a furnace body, the filtering device is connected to the outer container through an air returning duct, and the outer container is further provided with air suctionports in a first side face; transport chains of the transport system are erected on the upper sides of transport net chains through chain guide rails, the distance between the pair of chain guide rails is adjusted through a turbine worm mechanism to achieve more effective synchronous adjustment, and the accuracy of adjusting the distance between the chain guide rails is improved. Through the structures of the inner and outer containers, circulation work is achieved. In addition, the inner container is provided with the recycling vent which is connected with the filtering device outside the furnace body to dispose exhaust gas, and meanwhile the gas of the filtering device is returned to the furnace body for reuse at relatively high temperature. The energy is effectively saved, and heat lossis reduced.

Description

technical field [0001] The invention relates to the technical field of reflow soldering furnaces, in particular to a hot air reflow soldering furnace. Background technique [0002] In the field of component welding processing of circuit boards, two methods are usually used: reflow soldering and wave soldering. A group or point-by-point soldering process performed by an external heat source so that the solder reflows to meet the soldering requirements. The hot air reflow oven transfers heat energy through the laminar movement of hot air, and uses heating elements and fans to continuously heat up and circulate the air in the furnace. The parts to be welded are heated by the hot gas in the furnace to achieve welding. At present, during the production process of hot air reflow ovens on the market, the waste gas is usually extracted directly, and then discharged from the machine through the exhaust duct. In this process, the heat inside the machine will be taken away, and the r...

AI Technical Summary

Problems solved by technology

The width adjustment of the guide rails of common reflow ovens is driven by gear chains, and the fit clearance of the gear chains and processing and assembly errors often lead to low accuracy of guide rail width adjustment and inconvenient control, resulting in missing parts during production. ,affect production

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