Smoke box door sealing device applied to boiler

The utility model relates to a smoke box door sealing device applied to a boiler. The smoke box door sealing device is mainly composed of a front smoke box body, a left smoke box door, an upper pressing plate connecting assembly, a right smoke box door, a smoke box door compression device, a hinge set and a lower pressing plate connecting assembly, wherein the left smoke box door and the right smoke box door are both of an arc structure and are oppositely arranged at the front end of the front smoke box body; opposite ends of the left smoke box door and the right smoke box door are connected together through the upper pressing plate connecting assembly and the lower pressing plate connecting assembly and are fixed to the front smoke box body; the upper pressing plate connecting assembly is composed of a bolt, a gasket and a nut; the upper pressing plate connecting assembly and the lower pressing plate connecting assembly are of the same structure; the smoke box door compression device is composed of eight to twenty compression assemblies; the compression assemblies are evenly distributed among connecting edges of the left smoke box door, the right smoke box door and the front smoke box body. The smoke box door sealing device is improved based on a present foundation, is simple in structure and low in cost, most importantly is good in sealing performance, and can greatly reduce the phenomenon of smoke leakage during operation of the boiler.