This design is a furnace door mechanism that uses the weight of the door itself to press and close tightly.
There are guiding and linkage mechanisms on both sides of the door, and a cable above that pulls and lifts it. The pulley has a certain offset toward the front of the furnace. When lifting, due to gravity being in a vertical state, there is a gap with the furnace door at this time.
During closure, the cable no longer exerts force. The furnace door is supported by guide wheels, and the triangle plate rotates under the action of gravity, pressing the furnace door tightly against the furnace opening to achieve good sealing.
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