Mixer and feeder for foam spray gun - has component hoses and hot water hoses pref. inside reinforced sheath

摘要

Two component synthetic materials, esp. for the spraying of foam, are mixed and delivered by an installation comprising a proportioning pump, a mixing head and two heated component hoses. The synthetic materials are fed separately from the pump to the mixing head and >=1 hot water hose runs in contact with and along each component hose. Pref. the component hoses run together with hot water hoses which form a closed loop, from the proportioning pump to the mixing head and back, inside a sheathing hose, in which further hoses and/or electrical conductors are also enclosed. An electrical heater is provided for the hot water supply which is transported by an IC engine circulating pump. The preheating of the components from supply is effected in heat exchangers supplied by the hot water circuit. A temp. measuring and indicating instrument is provided at the reversal point of the hot water circuit. Provides a system esp. applicable to the rough operating conditions on building sites, by which the heating of the components can be controlled more easily and more efficiently. In the event of a breakdown along the tubular sheath, the trouble is more easily and quickly located and remedied.