Dustproof chute for particulate material loader

摘要

A dustproof chute for a particulate material loader including an airtight elastic tubular member located below a particulate material feeding device and defining by its wall a space below the particulate material feeding device, a discharge end tubular member of small length connected to a lower end of the airtight elastic tubular member, a particulate material stream diameter controlling tubular member located in a space within an upper end portion of the airtight elastic tubular member and permitting a particulate material fed by the particulate material feeding device to flow downwardly therethrough in a stream, and a ventilating space surrounding the particulate material stream diameter controlling tubular member and communicating with the particulate material feeding device. The particulate material stream diameter controlling tubular member has the function of reducing the diameter of a downwardly flowing stream of particulate material and causing the stream to flow substantially through the central portion of the space within the airtight elastic tubular member whereby an inner tube hitherto used in a chute of the prior art can be eliminated. The discharge end tubular member has the function of temporarily holding the downwardly flowing particulate material before it is released from the chute.