Nitric acid oxidation furnace platinum net closing device

The utility model discloses a nitric acid oxidation furnace platinum net closing device, including connection tube (4), connection tube (4) lower extreme welding support ring (1), place platinum net (2) on support ring (1), compressing tightly through assembling clamping ring (3) all around of platinum net (2), it assembles the constitution by a plurality of clamping ring split (31) through the connection step that both ends separately were equipped with to assemble clamping ring (3), clamping ring split (31) upper surface is equipped with and compresses tightly recess (32), the welding of connection tube (4) inner wall has stopper (5), set up threaded hole on stopper (5), threaded hole installs clamp bolt (6), clamp bolt (6) lower extreme stretches into to the compressing tightly of corresponding clamping ring split (31) recess (32) in. But compressing tightly platinum net's clamping ring split installation and dismantling, ability effective control platinum net's plane degree, roughness and elasticity degre