Patent ID: 9180492
Filing Date: 2015-11-10
Classification: B07B

Abstract:
1. A screening machine for superfine powder, the screening machine comprising: a) a casing, the casing comprising an inner cavity; b) a screen drum, the screen drum comprising an opening, a top cover, and a cylindrical sidewall; c) a funnel, the funnel comprising: a sidewall, and an upper opening; d) a negative pressure chamber; e) a rotary air spray pipe, the rotary air spray pipe comprising: a transverse pipe, a first vertical pipe, a second vertical pipe, and air jet holes; the air jet holes comprising a first aperture, a second aperture, and a third aperture; and the transverse pipe comprising a first terminal and a second terminal; f) a drive motor; g) a blast pipe, the blast pipe comprising: an air inlet, and an air outlet; h) a feed pipe, the feed pipe comprising: a feed inlet, and a feed outlet; and i) an external induced draft fan; wherein the screen drum is disposed in a middle part of the inner cavity of the casing; the funnel is disposed beneath the casing; the opening of the screen drum is arranged on a bottom of the screen drum and communicates with the upper opening of the funnel; the inner cavity of the casing communicates with the external induced draft fan via the negative pressure chamber disposed on an upper part of the casing; the rotary air spray pipe is arranged in a space between the screen drum and the casing; a middle part of the transverse pipe is connected via a transmission with the drive motor; the first vertical pipe is connected to the first terminal and is arranged perpendicular to the transverse pipe; the second vertical pipe is connected to the second terminal and is arranged perpendicular to the transverse pipe; the transverse pipe is arranged parallel to the top cover; the first vertical pipe is arranged parallel to the cylindrical sidewall; the second vertical pipe is arranged parallel to the cylindrical sidewall; the first aperture is longitudinally disposed along the transverse pipe and is arranged facing the top cover; the second aperture is longitudinally disposed along the first vertical pipe and is arranged facing the cylindrical sidewall; the third aperture is longitudinally disposed along the second vertical pipe and is arranged facing the cylindrical sidewall; the blast pipe is arranged vertically in a middle part of the screen drum; the air outlet of the blast pipe passes through the screen drum and is connected to the middle part of the transverse pipe of the rotary air spray pipe; the air outlet of the blast pipe is in rolling connection with the transverse pipe via a rolling bearing; the air inlet of the blast pipe stretches outside the sidewall of the funnel and communicates to an blast orifice of an external blast blower; the feed pipe is arranged inside the screen drum; the feed outlet of the feed pipe is arranged beneath a buffering umbrella; and the feed outlet of the feed pipe stretches outside the sidewall of the funnel.