A sieve system for a grinding device permitting the processing of materials in terms of particle size, in particular the processing of solid or powder materials. The system includes a filtering portion having fine holes and designed to cooperate with a rotor of the grinding device in such a way as to press the material to be ground through said filtering portion; and a support portion having large holes, which is able to reinforce the filtering portion. The sieve can be coupled to a vibratory device. The sieve system allows for the grinding method to be operated in continuous mode, with a material flow rate through the sieve up to 50% higher than that reached with a conventional sieve.

A device (10) for welding components by ultrasound. The device (10) comprises a sonotrode (11) having a sonotrode head (12), which can be excited by a vibration generator to produce torsion vibrations with respect to a torsion axis (T). At least one welding surface (14) is arranged on the peripheral side on the sonotrode head (12) with respect to the torsion axis (T). The device (10) also comprises a support device (15) which supports the sonotrode head (11) in a support area (16), which contains a vibration node of the sonotrode head (12). The support area (16) and the welding surface (14) at least partially extend along a common plane (E) which extends perpendicular to the torsion axis (T). A device (10) for welding components by ultrasound by using a temperature control device are also disclosed.

The invention relates to, inter alia, a screening system (10), comprising: at least one first substantially annular screen support (11) and a second substantially annular screen support (12); at least one pressure rod (14), which braces the screen supports (11, 12) with each other in such a manner that a compressive stress is produced between the screen supports (11, 12); at least one substantially cylindrical outer screen surface (13), which is clamped between the screen supports (11, 12); and at least one resonator (15) for the introduction of ultrasonic vibrations directly into the screen surface (13). According to a first embodiment of the invention, the resonator (15) is fastened to the screen surface (13) and essentially runs from the first screen support (11) to the second screen support (12). The invention further relates to an eddy-current screening machine and to the use of a screening system (10) or of an eddy-current screening machine.

The present invention relates to a screening device for separating dry granular material into a fine fraction and a coarse fraction. The device comprises a drum screen defined by an open rotatable frame, which frame defines a circumferential wall, and a sheet-like screen arranged over the circumferential wall of the frame, a driving device by means of which the drum screen is rotatably driven, a feed opening at a short end of the drum screen and a discharge opening at the opposite short end of the drum screen. The screening device comprises a vibration device which rotates along with the drum screen, which vibration device comprises one or more vibrating elements mounted to the drum screen, which set the drum screen vibrating in use. The invention further relates to the screening of granular material using such a device.

A conditioner for filtering and drying recyclable abrasive media, such as steel grit, garnet, or other abrasive media used for abrasive blasting operations for steel structures, such as bridges, tanks, and marine vessels that are being repainted. The conditioner may include a pre-classifier (e.g., a trommel) to separate or filter the abrasive media from larger debris that may be vacuumed with the abrasive media during resurfacing operations. A dryer may use radiation elements (e.g., infrared (IR) lamps) positioned above a conveyor (e.g., vibration tray) that moves the abrasive media beneath the radiation elements. Vacuum airflow may bypass the dryer except for a portion of the vacuum airflow used to remove moisture from the dryer while drying the abrasive media. The conditioner may have a drying portion or the entirety under negative pressures.

An apparatus for acoustic concentration of particles in a fluid flow includes a substantially acoustically transparent membrane and a vibration generator that define a fluid flow path therebetween. The fluid flow path is in fluid communication with a fluid source and a fluid outlet and the vibration generator is disposed adjacent the fluid flow path and is capable of producing an acoustic field in the fluid flow path. The acoustic field produces at least one pressure minima in the fluid flow path at a predetermined location within the fluid flow path and forces predetermined particles in the fluid flow path to the at least one pressure minima.

The invention relates to a screen insert (70) for a powder container (24) of a powder supplying device, the screen insert (70) having a screen unit (71) for screening coating powder and an ultrasonic transducer (72) for generating ultrasonic vibrations. The screen unit (71) is connected to the ultrasonic transducer (72) in such a way that the ultrasonic vibrations generated by the ultrasonic transducer (72) can be transferred to the screen unit (71). To allow a particularly compact construction of the screen insert (70) to be achieved, according to the invention a screen carrier (73) which can be placed onto the powder container (24) is provided, for holding the ultrasonic transducer (72), with the screen unit (71) connected thereto, in such a way that the screen unit (71) is arranged below the screen carrier (73), so that the screen unit (71) is inside a powder chamber (22), formed by the powder container (24), when the screen carrier (73) has been placed onto the powder container (24).

An apparatus which allows a flexible classification of poly- and/or monocrystalline silicon comprises a winnowing device configured to separate crushed material of poly- and/or monocrystalline silicon into a fine fraction and a coarse fraction. The apparatus also comprises an optoelectronic sorting device configured to separate the coarse fraction into at least two fractions.

A sieve guide assembly and a method of fractionation using a sieve guide assembly comprising a circular sieve screen (190) and a sieve guide 310 mountable in a fractionating device, wherein the fractionating device comprises a drive adapted for: (i) in combination with a sieve screen without a sieve guide, inducing a lateral flow of granules defining lateral streamlines 31a.1. 31b.1, 31c.1, 31d.1 and an orbital flow defining orbital streamlines 31a.2. 31b.2, 31c.2, 31d.2, 31d.3 on the sieve screen (190), and (ii) in combination with the sieve guide assembly, inducing a guided lateral flow of granules defining guided lateral streamlines (331.3) and a central guided orbital flow defining central orbital streamlines (331.2) on the sieve screen (190), whereby the sieve guide assembly is adapted to provide a uniform, controlled and effective exposure of the granules to the sieve screen.

An automated de-powdering system comprises a separation station having a support structure configured to support a build box containing an additive manufacturing build. An actuator is configured to move at least a portion of the additive manufacturing build out of the build box and into a sleeve. A separation mechanism is configured to separate the portion of the additive manufacturing within the sleeve from a remainder of the additive manufacturing build. A de-powdering station includes a conveyor configured to convey the separated portion of the build away from the remaining portion of the build, and an agitation mechanism is configured to separate unbound powder build material from one or more objects of the portion while the portion is being conveyed by the conveyor.