Patent AU-2018101246-A4 (AU)
Title: Vibrating screening feeder and method of use
Inventor: DUMBAUGH GEORGE D
IPC: B65G27/32
Filed: 2018-08-28
Granted: 2018-09-27
Abstract: A method of screening aggregate using a vibrating screen unit including a fixed base unit supporting an intermediate base with connecting vertical support coil springs, and a vibrating 5 screen and housing rotatably connected to said intermediate base by drive coil springs and leaf spring rockers driven by drive motors with eccentric weights attached to said intermediate base, comprising the steps of: a) providing said vibrating screen unit comprising: a generally rectangular fixed base with a plurality of upward extending support coil springs, said support coil springs fixedly attached to a top surface of said fixed base and fixedly attached to 10 a bottom surface of a generally rectangular intermediate base, said intermediate base having at least two rows of alternativing large and small triangular abutments extending upward therefrom, said large triangular abutments having a first side forming about a forty-five degree angle with a top surface of said fixed base, said first side of said large triangular abutment having a drive coil spring extending upward therefrom at about a forty-five degree angle with 15 a top surface of said fixed base member, said small triangular abutments having a second side forming about a forty-five degree angle with a top surface of said fixed base, said second side of said small triangular abutment having two spaced apart leaf spring rockers extending upward at about a forty-five degree angle with a top surface of said fixed base, said first side of said large abutment facing toward said second side of said small abutment; a generally 20 rectangular vibrating screen housing having at least two rows of downward extending trapezoidal abutments on a bottom surface thereof, said trapezoidal abutments fixedly connected on a third side to free ends of said upward extending drive coils and on a fourth side to free ends of said upward extending leaf springs, said vibrating screen housing having at least one screen, an input hopper and at least two output apertures formed therein; said 25 vibrating screen housing having a plurality of single or 3 phase electrically adjustable alternating current motors mounted at one end thereof, said motors having output shafts extending from top and bottom ends with eccentric weights mounted on said shafts in mechanical time with one another said motors fully electrically adjustable over the complete range of zero to maximum output; a vibration drive isolation assembly for vibrating said 30 vibrating screening unit; said vibration drive isolation assembly including at least two parallel longitudinal counterbalance beams supported on a plurality of isolation drive springs distributed across the width of said vibrating screening unit; at least one vibratory drive motor installed on said longitudinal counterbalance member; said vibration drive isolation assembly includes a variable speed motor controller for adjusting vibration intensity; said variable speed motor controller being operatively arranged for dynamically adjusting vibration intensity during a timed cycle; said timed cycle includes an electrical control enabling a full zero to maximum output adjustment by means of adding a standard variable frequency (VFD) 5 combined with adjustable timers so that a vibratory stroke required screening has an automatic capability of a momentary "pulsing" to 60 hertz (or higher) for a brief time of usually 3 to 5 seconds, which generates a "spurt" or "pulse" to the entire screening body for clearing screen media of a lump or a particle stuck in a screen opening or to break free accumulated layers of adhesive and cohesive particles that try to "stick" or adhere to the surface of a screening media 10 and a passed "under" collecting pan there below; said input hopper includes a vibratory motor; and a programmable motor control unit driving said motors with said weights synchronized with one another and capable of driving said motors at a selected speed and of periodically changing said speed for a selected time interval by a selected amount; b) inputting aggregate material to an input hopper at an input end of said vibrating screen; collecting and using 15 screened aggregate; c) collecting coarse aggregate; d) reprocessing coarse aggregate and recycling, reprocessed aggregate into said input hopper; and e) setting programmable drive motor controller for proper cycling between normal speed and a slightly higher speed for selected time periods to prevent clogging of vibrating screen.