A continuous sieving apparatus is described. The continuous sieving apparatus includes an inclined sieve surface attached to a wall. The inclined sieve surface is inclined with respect to a horizontal axis for pupae to continuously flow across down the incline. A set of openings is formed in the sieve surface so as to define a set of pathways extending through the sieve surface. The set of opening are defined by a length dimension that is greater than a width dimension. When the inclined sieve surface is submerged in a liquid, a first pupa having a first cephalothorax width that is less than the width dimension is free to move through any one of the set of openings, and a second pupa having a second cephalothorax width that is greater than the width dimension is prevented from moving through the set of openings.

The present invention relates to a mobile aggregate processing plant for screening aggregate material comprising a mobile chassis having a main frame and a vibrating screening unit mounted via one or more absorbers on a screen-mounting frame and able to provide at least one aggregate discharge stream therethrough, wherein the vibrating screening unit is moveable relative to the screen-mounting frame between a first in-use position, and at least a second position able to provide an access portal below the vibrating screening unit when not in use.

The present invention relates to a mobile aggregate processing plant for screening aggregate material comprising a mobile chassis having a main frame and a vibrating screening unit mounted via one or more absorbers on a screen-mounting frame and able to provide at least one aggregate discharge stream therethrough, wherein the vibrating screening unit is moveable relative to the screen-mounting frame between a first in-use position, and at least a second position able to provide an access portal below the vibrating screening unit when not in use.

A grain-cleaning machine for obtaining grains has a desired size which is greater than a lower value and less than or equal to an upper value. The grain-cleaning machine comprises an arrangement of sieves. The arrangement of sieves comprises at least two main sieve levels positioned overlapping each other. Each main sieve level comprises a respective fine sieve followed by a respective grain sieve. At least one lower sieve level comprises a respective lower grain sieve. The at least one lower sieve level being positioned below the main sieve levels. Each fine sieve has a first mesh provided with openings having an opening size which is equal to said lower value, and each grain sieve and each lower grain sieve have a second mesh provided with openings having an opening size which is equal to said upper value.

A vibratory drive system comprises a rotatable drive shaft and an out-of-balance wheel that is coaxial with and rotatable relative to the drive shaft. A rotary transmission system couples the drive shaft to the wheel in order to transmit rotational movement of the drive shaft to the wheel. The rotary transmission system comprises a shaft gear, a wheel gear, and intermediate gears coupling the shaft gear to the wheel gear. The intermediate gears are carried by a gear carrier that is rotatable relative to the drive shaft, and are rotatable with respect to the gear carrier. The arrangement allows the phase angle of the out-of-balance wheel to be adjusted with respect to the drive shaft.

The concepts, systems and methods described herein are directed towards a device sifting soils. The device is provided to including: a frame having open areas at top, bottom, and rear side; a plurality of wheels coupled to the frame; a first screen coupled to the frame, wherein the first screen has a grid to receive material for sifting; a vibrating unit coupled to the first screen, wherein the vibrating unit is configured to vibrate the first screen such that small objects and dirt in the material pass through the screen and the open areas of the frame and the large objects in the material fall off from the first screen at a first side of the sifting device; and a tow hitch to be coupled to a vehicle, the vehicle pulling the sifting device using the tow hitch.

The concepts, systems and methods described herein are directed towards a device sifting soils. The device is provided to including: a frame having open areas at top, bottom, and rear side; a plurality of wheels coupled to the frame; a first screen coupled to the frame, wherein the first screen has a grid to receive material for sifting; a vibrating unit coupled to the first screen, wherein the vibrating unit is configured to vibrate the first screen such that small objects and dirt in the material pass through the screen and the open areas of the frame and the large objects in the material fall off from the first screen at a first side of the sifting device; and a tow hitch to be coupled to a vehicle, the vehicle pulling the sifting device using the tow hitch.

A vibratory screener includes a screen carrier frame having inner and outer circumferences, a horizontal screen for separation of solid particles within and vertically supported by the frame, one or more vibration motors on the outer circumference of the screen carrier frame and configured to generate vibration perpendicular to the screen, and at least two internal annular disks each having an inner rim and an outer rim. Each internal annular disk is attached to the inner circumference of the frame by its outer rim, the internal annular disks are spaced apart from each other in parallel planes, and an inner sleeve is arranged within the frame. The inner sleeve is attached the inner rims of two of the internal annular disks, where the upper internal annular disk and the inner sleeve provide an unbroken surface and where the lower internal annular disk has openings towards the outside environment.

A vibratory screener includes a screen carrier frame having inner and outer circumferences, a horizontal screen for separation of solid particles within and vertically supported by the frame, one or more vibration motors on the outer circumference of the screen carrier frame and configured to generate vibration perpendicular to the screen, and at least two internal annular disks each having an inner rim and an outer rim. Each internal annular disk is attached to the inner circumference of the frame by its outer rim, the internal annular disks are spaced apart from each other in parallel planes, and an inner sleeve is arranged within the frame. The inner sleeve is attached the inner rims of two of the internal annular disks, where the upper internal annular disk and the inner sleeve provide an unbroken surface and where the lower internal annular disk has openings towards the outside environment.

A base supports an inclined screen having a uniform mesh selected to remove larger aggregate from a first cement mixture to form a second cement mixture that passes through the screen. A powered vibrator vibrates the screen to separate the concrete mixtures and larger aggregate. Springs and/or dampers in support legs isolate the vibrating screen from the base. A guide frame on the top surface of the screen guides the first concrete mixture along the screen and guide the separated aggregate out a bottom opening into an aggregate container. A support frame on the bottom surface of the screen stiffens the screen to help support the weight of the concrete. A concrete container, preferably wheeled, is below the screen to collect the second concrete mixture and move it to its use location.