The invention discloses a front and back volume-variable trolley resistance furnace. The front and back volume-variable trolley resistance furnace mainly comprises a furnace body with openings in the front end and the bottom, a furnace lining, a furnace door, a furnace door lifting mechanism, an
electric heating element, a trolley, a trolley walking mechanism, an electric appliance control mechanism, a sealing mechanism and a trolley
control system at the front end of the trolley. Through structural steel
welding, the furnace body is manufactured into a front furnace shell framework and a rear furnace shell framework which are different in volume; a heat insulation board is arranged in the middle of the trolley to separate the interior of the furnace body into two parts, and therefore the requirement of the different sizes for a
combustion chamber is met. Two parts or devices can be heated at the same time, the production and heating cost is reduced, labor force is reduced by one half,
economic benefits are improved, and the resources are fully utilized. The sealing mechanism comprises a pneumatic pushing rod, a connecting rod mechanism and a sealing pressing strip. The front and back volume-variable trolley resistance furnace is high in
automation degree and good in sealing and
heating effect. A furnace bottom plate, a heavy aluminum plate, a wire containing
brick and a
refractory brick which are sequentially and tightly arranged on the trolley from top to bottom enable heating and heat preservation effects to be perfect, and the service life of the trolley is prolonged.