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 invention proposes a grain-cleaning machine (10) comprising an envelope (12) with an inlet opening (13), an arrangement of sieves inside the envelope (12) and a vibration system designed to cause the sieve arrangement to oscillate. The sieve arrangement comprises at least two main sieve levels (14a, 14b, 14c) arranged the one above the other, with an inclination relative to the horizontal from a high side (L1) to a low side (L2), each main sieve level (14a, 14b, 14c) comprising respective fine sieves (141) followed by respective grain sieves (142), and under each fine sieve (141) respective fine-carrying channels (143) are arranged in communication with at least one outlet (18) for residues smaller than the grains, whereas under each grain sieve (142) respective grain-carrying channels (144) are arranged in communication with at least one grain outlet (19). The sieve arrangement further comprises at least one lower sieve level (16) with respective lower grain sieves (162), and under the lower grain sieves (162) respective lower grain-carrying channels (164) are arranged in communication with at least one grain outlet (19). The lower sieve levels (16) are arranged under the respective main sieve levels (14a, 14b, 14c) with an inclination relative to the horizontal from a high side (L3) to a low side (L4), wherein the low side (L2) of each main sieve level (14a, 14b, 14c) is in communication with the high side (L3) of the respective lower sieve level (16) through a vertical passage (17), and the low side (L4) of the lower sieve level (16) is in communication with at least one of the outlets (20) for residues larger than the grains.

Apparatus (200) for sorting mixed waste materials, comprising: a housing (260) configured to be vibrated to assist sorting; a screen (210) supported by the housing (260) and having an inlet end (212) for receiving waste materials and an outlet end (214) for discharging at least some waste received at the inlet end (212), the screen (210) comprising at least one portion (220) pivotally coupled adjacent the inlet end (212) to a substantially horizontal axle (222) mounted in the housing (260); and drive means (224,228) configured to pivot the at least one portion (222) of the screen (210) about the axle (222) with a controlled reciprocating action.

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.

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.

A screening bucket system for screening debris out of otherwise clean materials. The screening bucket system generally includes a bucket adapted to be connected to a loader. The bucket includes a rear wall, a pair of side walls, and a blade across its front end. A floor of the bucket is hingedly connected at a front end to the side walls by a hinge. The rear end of the floor includes a rod mount to which a lift rod powered by a motor is rotatably connected such that, when the lift rod is raised or lowered, the free end of the floor raises and lowers while the hinged end of the floor rotates about the hinge. A screen may be positioned on the floor such that materials on the screen may be sifted of debris by activating the lift rod to rapidly raise and lower the floor and screen.

Embodiments of the invention provide a synchronous statically indeterminate mesh-beam excitation large-scale vibrating screen, including a screen box, a support spring group, a spring base, a motor mount, a tire coupling, and a motor, wherein, a statically indeterminate mesh-beam excitation body is arranged on the screen box, and the statically indeterminate mesh-beam excitation body has at least one synchronous eccentric block vibration exciter group and two self-synchronous eccentric block vibration exciter groups in it; each self-synchronous eccentric block vibration exciter group includes a self-synchronous transmission shaft fixed to the side plates of the screen box via a bearing chock, and self-synchronous eccentric blocks fixed to the side plates of the screen box in symmetry are arranged on the self-synchronous transmission shaft; the self-synchronous transmission shaft of the self-synchronous eccentric block vibration exciter group at the side of the motor is connected with a reducer via the tire coupling, and the reducer is connected to the motor via a transmission belt.

A powder distributing device for preparing sheet-shaped magnets and a powder distributing method thereof are provided. The powder distributing device includes a mold, a powder feeding mechanism, and a vibrating mechanism. The mold includes a mold body and a screen disposed above the mold and connected to the mold body. The screen sifts magnetic powder into at least one mold cavity of the mold body. The powder feeding mechanism feeds the magnetic powder to the screen. The vibrating mechanism is connected to the mold body The vibrating mechanism drives the mold body and the screen to vibrate together, so that the magnetic powder on the screen is evenly sifted into the mold body and filled to a predetermined density, which improves uniformity of powder distribution in the at least one mold cavity during a molding process, thereby improving performance and consistency of the sheet-shaped magnets.