Recovery system for protective gas of annealing furnace

The invention discloses an annealing furnace protective gas recovery system which comprises a gas guide pipe communicated to the top of a furnace body, a fan is connected to the end, away from the furnace body, of the gas guide pipe, a filter box is connected to the side, away from the gas guide pipe, of the fan, a stop lever is fixed in the filter box, a filter screen is placed on the stop lever, and a strip-shaped brush body is arranged on the side, close to the fan, of the filter screen. And a driving mechanism for driving the brush body to reciprocate is arranged on the filter box. The hydrogen recovery device has the effects of improving the hydrogen recovery efficiency of the set-type annealing furnace and reducing the hydrogen recovery cost. 本发明公开了一种退火炉保护气体回收系统，包括连通于炉体顶部的导气管，导气管远离炉体的一端连接有风机，风机远离导气管的一侧连接有过滤箱，过滤箱内固定有挡杆，挡杆上放置有过滤网，过滤网靠近风机的一侧设置有条形刷体，过滤箱上设置有用于驱动刷体往复移动的驱动机构。本申请具有提高置式退火炉的氢气回收效率，降低氢气回收成本的效果。