Hitachi Zosen Corporation

Daisuke Tamakoshi

Hidehiko Maehata

Tetsuya Inoue

Hiroaki Arai

Masanori Tsukahara

Hiroyuki Daiku

Tsuyoshi Kato

Kenichi Nagai

Katsuya Sasaki

Shogo Hamada

Tomohiko Suzaki

Yutaka Isawa

A composite sorting apparatus for separating conductive materials from non-conductive materials comprising a drum electrode, needle-shaped electrodes, and a plate-shaped electrode, wherein the plurality of needle-shaped electrodes are arranged so that the interval X in cm (in) between discharge sections of adjacent needle-shaped electrodes with respect to the distance L in cm (in) from the tips of discharge sections to the drum electrode meets 0<X/L &lE;3.

Composite separator

A device for electrostatically separating different kinds of crushed plastic pieces and correctly sorting them according to kind. The device has a classifying section ( ) for classifying plastic pieces according to size, a frictional charging device ( ), a pair of drum type electrostatic separating devices ( ), and collecting sections ( ) disposed below the electrostatic separating devices. Partition walls ( ) for partitioning the collecting sections are constructed to be horizontally movable according to the fall positions associated with the polarity and amount of electric charge of each plastic piece ( ). Therefore, separation can be correctly effected without changing the voltage from a high voltage power source device ( ).

Plastic chip separator

Supplying a predetermined amount of electric energy to a fine metal wire in a short time causes the fine metal wire to melt and evaporate. Following this phenomenon, a blasting substance expands in volume, so that the evaporative expansion force resulting from the melting evaporation of the fine metal wire is transmitted to and blasts a to-be-blasted object

Blasting apparatus, blasting method and retainer member used for the blasting method

The invention provides a plastic sorting method and apparatus, which, when plastic pieces comprising a plurality of types of resin plastics are agitated and frictionally charged, are able to impart the plastic pieces a necessary amount of charge or polarity for the thorough separation even if the difference in the amount of the different types of plastic pieces is large and to increase the recovery rate. If the amount of a specified type plastic pieces ( ) to be recovered is small, the agitation and the electrostatic separation is carried out after adding the specified type plastic pieces ( ) as auxiliary frictional charging material ( ) into the frictional charging device ( ), and the auxiliary frictional charging material ( ) remains in the frictional charging device ( ) and is used repeatedly.

Method and apparatus for separating plastic

When plastic pieces of plural different types of resins fed into a hopper are agitated to be triboelectrically charged, the plastic pieces are not imparted with sufficient amounts of charges or proper polarities which are required for separation of the plastic pieces if there are great differences in quantity between the different types of plastic pieces. This makes it impossible to properly separate the plastic pieces. Where the amount of pieces of a particular plastic to be separated is small, pieces of the particular plastic are additionally fed as a triboelectrification agent into a triboelectric charger ( ) and agitated with the plastic pieces. Thus, different types of plastic pieces ( ) (e.g., PVC and PE) are prevented from being imparted with the same polarity and are imparted with different amounts of charges, so that the separation can assuredly be carried out in an electrostatic separating section (G) for recovery of the particular plastic pieces.

Method of separating plastic

A fusible and vaporizable substance (for example, a thin metal wire is used) is fused and vaporized by supplying thereto a predetermined amount of electrical energy from a capacitor of an electrical energy supply circuit for a short period of time, and nitromethane is detonated by a phenomenon in the process in which the fusible and vaporizable substance fuses and vaporizes, so that an object to be blasted is reliably blasted by this detonation force.

Blasting apparatus and blasting method

A conveyor ( ) feeds batches of plastic chips ( ) in feeding amounts W to a charging device ( ). After the plastic chips ( ) have been stirred and charged inside the charging device ( ) for a certain period of time T, they are ejected in batches and fed continuously by a screw feeder ( ) to a drum electrode ( ) at a feeding amount per unit time W . The feeding amount per unit time W is adjusted so as to satisfy W /T&lE;W &lE;v&times;B&times;H&times;D where v is the rotation speed of the drum electrode ( ), B is a width of the drum electrode ( ), H is an average thickness of the plastic chips ( ) that have been fed onto the drum electrode ( ), and D is a bulk density of the plastic chips ( ).

Plastics sorting apparatus

An electric screen device for preventing creatures from intruding into a water channel, which comprises a pair of opposed electrode assemblies disposed on opposite sides of a water intake channel, and a dc pulse applying device for applying dc pulses between the electrode assemblies. In such electric screen device, the product of the peak value of the intensity of an electric field produced between the electrode assemblies by the dc pulse applying device and the body length of creatures to be prevented from intrusion into the water channel is not less than 0.1 V, the dc pulse applying time is within the range of 2-200 msec, and the duty factor of the dc pulse is not more than 0.5.

Electric screen device

An apparatus which is constituted to supply electrical energy to a melting and vaporizing material (for example metal wire,) so as to cause the melting and vaporizing material to melt and vaporize, thereby demolishing an object to be demolished (such as concrete,) using the vaporization and expansion force generated at the time of melting and vaporization of the material; wherein either by providing a granular material 8 which ejects from a container following the generation of the vaporization and expansion force, or by using an inflammable material as demolishing material 46 in which the melting and vaporizing material is immersed, a to-be-demolished object is demolished with a strong demolishing force.

Demolishing apparatus using discharge impulse

A thin metal wire,is fused and vaporized by a predetermined amount of electrical energy supplied to the thin metal wire,for a short period of time, whereby a blasting substance,is expanded in volume. Therefore, a vaporization expansion force caused by the fusion and vaporization of the thin metal wire,moves a shock delivering member,, so that the shock delivering member,, colliding with a to-be-blasted object H,, delivers a shock to the to-be-blasted object H,, thereby blasting the to-be-blasted object H

Blasting apparatus

Supplying a predetermined amount of electric energy to a fine metal wire,in a short time causes the fine metal wire,to melt and evaporate. Following this phenomenon, a blasting substance,expands in volume, so that the evaporative expansion force resulting from the melting evaporation of the fine metal wire,is transmitted to and blasts a to-be-blasted object

Destroying apparatus and method, and holding member for use in that method

A frictional charging device (,) for charging crushed chips (,) of a plurality of kinds of plastics by stirring them. A stirring vessel (,) has a friction assisting material (,) put therein, the particles of the friction assisting material (,) being so formed that they are larger than the plastic chips (,). A delivery port (,) formed in one end of the stirring vessel (,) is provided with a plurality of delivery area wires (,) arranged at predetermined intervals and parallel to each other. The spacing between adjacent delivery area wires (,) is set larger than the plastic chips (,) and smaller than the particles of the friction assisting material (,).

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Osaka, Japan

Daisuke Tamakoshi