| 摘要 |
Two foamable chemicals are diverted from a recirculation path by simultaneously operable pivoting ball valves to respective separate paths through respective one way valves, pressure responsive normally closed poppet valves, and a common conduit to a common mixing chamber wherein they are mixed by identical counter rotating shafts having roll pins extending through diametric bores, before the thus mixed chemicals are discharged into a suitable mold. Solvent and air are supplied underthe control of selectively operable valves through pressure responsive poppet valves to the same common conduit as the chemicals for washing the chemicals from the conduit, from the outer face of the chemical poppet valves, and for further washing the mixing chamber. The controllable valves, the actuators for the controllable valves, and a drive motor for the counter rotating shafts are all contained on a main body that may be of a suitable size without restriction, and the check valves, pressure responsive valves, common conduit, counter rotating mixer shafts, and mixing chamber are all contained in a common flat head and generally symmetrically in a horizontal plane, so that the head is of minimum height for insertion into a mold. The chemical, solvent and air passage ways, and the mechanical drive between the mixer and drive motor all have separable couplings between the head and main body, so that an extension may be selectively inserted so that the automatic valve and mixing head may be inserted deeply into a mold cavity, for example to insert foam into a mold cavity approximately 1 inch high, of indefinite length, and of a width of 3 to 4 feet for making rigid foam panels with outer facing materials of metal or the like.
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