Lifting door furnaces
If there is restricted space or semi-automatic charging, furnaces with an automatic door opening system are suitable as this does away with the swing area of the wing doors.
If the operator cannot press the “small buttons” because he is wearing thick gloves during batch change, foot actuated pushbuttons are an advantage. This furnace also offers a small platform in front of the lifting door to place a tool change car at the same height as the internal floor of the furnace.
These lifting doors close off a joint furnace chamber. With long cycle times and high batch masses a relatively short opening time does not upset the thermogram of the furnace chamber. As the furnace is charged with forklifts in the above case, the fork lift driver triggers the lifting door with a remote control. You can see the heat exchanger of the gas burner in the interior space.
As the internal floor is supposed to be at operator height, and lifting doors result in a great total height due to their construction type, a divided movement was selected in this case. A foot actuated pushbutton was installed for easer charging.
The transport system for the batch is attached to the furnace roof here. Hanging plates do not allow any swivel range of a wing door and no lifting door which opens upwards. Driving paths in the production hall also prevent lateral movement of a sliding door. That is why the furnace is shut by means of a roller door closing from below.
Three independent conveyor belts in parallel can run through one joint tempering oven. The small lifting doors are actuated pneumatically and are pressed tight automatically when the doors close.