JPH09192526A - Discharge crusher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To crush blocks by pulse discharge of a high voltage current in liquid efficiently and continuously. SOLUTION: A grounded classification electrode 2 which is constituted in a vibrating classification screen which is vibrated by a vibrator and moves a treatment material B in the slanted long shaft direction is immersed and installed in water W in a liquid tank 1, and above the electrode 2, the base part 3a of a discharge electrode 3 having a rod-shaped discharge iron core 3b the tip of which is formed in a semi-spherical form is pivoted by a support shaft 4 installed in the upper part of the liquid tank 1 and connected with a high voltage pulse generator 5 outside the liquid tank 1, and the tip part which points to the upper surface of the electrode 2 is installed freely rotatably/ movably in the transfer direction of the material B. In this way, the tip of the discharge electrode is made to contact automatically with the block-shape material B which is supplied continuously and moves on the electrode 2 to be crushed by pulse discharge.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge crushing device, and more particularly to a discharge crushing device for continuously crushing a lump-like object to be treated immersed in a liquid by pulse discharge of high voltage current.

[0002]

2. Description of the Related Art Conventionally, a crusher for crushing rocks, concrete lumps or the like has been used mainly for crushing by applying mechanical shock or pressure.
Since a crushing part that wears itself is not required because mechanical shock or pressure is applied to the object to be processed, the device configuration is simple, the strength properties of the object to be processed are less affected, and total energy consumption can be expected to be reduced. The application of the crushing method by pulse discharge of high voltage current is being studied. This electric discharge crushing was originally developed as a method of excavating wells, etc., and when a high-voltage current is pulse-discharged to a grounded solid dielectric, a through conductive channel is formed inside it, and then inside that channel. Electrical energy is accumulated and expands in the space to create a mechanical stress field that alternates temporally and spatially, exerting pressure on the surroundings, and the strong divergence of the stress wave and these stress waves cause the free grain boundaries of rocks and It utilizes a phenomenon in which a solid is instantaneously crushed by causing radial fractures that spread from the through conductive channel in all directions by interacting with a non-uniform portion. Also, if the surroundings are in a conductive atmosphere, the pulse current leaks out and the energy loss at the stage of the generation of the through conductive channels becomes large.Therefore, discharge crushing of the lumpy object requires the use of a weak conductive liquid such as water. It is performed by the pulsed discharge in the liquid. And as a crushing device for lumps by such pulse discharge,
For example, the former Soviet Union patent SU1392717 and Japanese Patent Publication No. 4-
A discharge crushing device disclosed in No. 35229 is known.

The former electric discharge crushing device (SU1392717)
Is a schematic explanatory diagram [Fig. 3],
It has an upper open liquid tank (21) accommodating (W) and a net bottom collection bucket (A3a) .It is immersed in the water (W) in the liquid tank (21) and is electrically connected. Grid-shaped classification electrode grounded to
(22) and the base connected to the high voltage pulse generator (24) outside the liquid tank (21) are positioned on the water surface of the liquid tank (21) and the tip is immersed in water (W). , And a movable discharge electrode (23) arranged so as to be movable in the vertical and horizontal directions. In this electric discharge crusher, the object to be treated (B) such as rock or concrete lump
While being charged on the classification electrode (22) in water (W), the tip of the movable discharge electrode (23) is brought into contact with the object to be treated (B), and the high-voltage current is pulse-discharged for crushing. To do. In addition, the movable discharge electrode (23) is moved up and down and moved laterally to change the discharge position with respect to the object (B) to be crushed one after another, and the crushed products passing through the classification electrode (22) are collected in the lower recovery bucket (22a). ) To collect and take out. The fine powder that has settled through the mesh of the collection bucket (22a) is collected as sludge from the bottom of the liquid tank (21).

Further, the latter electric discharge crushing device (Japanese Patent Publication No.
No. -35229), as shown in the schematic explanatory view [Fig. 4], a fixed electrode (22) connected to an external power supply device (24) is provided at the bottom, while an external tank (25) Semi-sealed liquid tank that stores low-temperature liquefied gas (L) such as liquid nitrogen supplied
(21) and a moving device (2
6) The movable discharge electrode (23) that is moved up and down toward the fixed electrode (22) at the bottom by means of 6), and the object to be treated (B) is moved up and down from above the liquid tank (21) to place the object (B) at the bottom of the liquid tank (21). The low temperature liquefied gas from the bucket (27) to be loaded on the fixed electrode (22) and the inner bottom of the liquid tank (21).
And a belt-shaped carrying-out device (28) arranged toward the upper part located on the liquid surface of (L). With this electric discharge crusher, the object to be treated (B) that is difficult to crush at room temperature, such as tires,
It is charged on the fixed electrode (B2) at the bottom of the liquid tank (21), and is cooled and embrittled by the low temperature liquefied gas (L) in the liquid tank (21), and at the fixed electrode (22) below it. On the other hand, the movable discharge electrode (23) is lowered so as to face the object to be treated (B), and the power supply device (24) instantaneously moves between the movable discharge electrode (23) and the fixed electrode (22). Pulse discharge, and by the synergistic effect of the crushing force due to the discharge and the shocking high pressure generated by the intense vaporization of the low temperature liquefied gas (L) accompanying the discharge, the low temperature embrittlement target (B) is removed. Crush. In addition, the crushed product is a unloading device.
(28) collects the gas to the outside, and most of the gas generated in the liquid tank (21) is centrally discharged and collected by the exhaust blower (29).

[0005]

The above-mentioned electric discharge crushing device does not require a crushing part which gives a shock or pressure to the object to be treated, unlike a conventional mechanical crusher, and the structure of the device is simplified and the crushing part is Although the burden of inspection and maintenance due to abrasion can be eliminated, there is a problem that the object to be treated cannot be continuously supplied and continuously crushed. That is, in the above-described conventional electric discharge crushing device, the object to be treated is loaded on the fixed side ground electrode, and the tip of the movable discharge electrode is brought into contact with the object to be treated to cause the in-liquid discharge, that is, by the pulse discharge. At the time of crushing, it is necessary to position the object to be processed on the fixed side ground electrode and stop it, so it is a batch process to carry in and crush the object to be processed at regular intervals, and to perform a series of crushing. The time required to carry in the object to be processed and to move and move the movable discharge electrode to each object becomes long, and it is difficult to improve the crushing efficiency.

The present invention has been made in order to solve the above-mentioned problems of the prior art, in which the continuously fed object to be treated is moved on the ground electrode which is disposed by being immersed in the liquid in the liquid tank. Provided is a discharge crushing device capable of continuously and efficiently crushing a lumpy object to be processed by automatically contacting the tip of the discharge electrode with the object to be processed moving on the ground electrode to cause pulse discharge. The purpose is to do.

[0007]

In order to achieve the above object, the present invention has the following arrangement. That is, the discharge crushing apparatus according to the present invention, a liquid tank containing a weakly conductive liquid, a high voltage pulse generator arranged outside the liquid tank,
The immersion electrode is placed in the liquid in the liquid tank, and the ground electrode has a mounting surface for the object to be processed on the upper surface and is electrically grounded, and the tip is immersed in the liquid in the liquid tank, and the liquid A base located on the surface is connected to the high-voltage pulse generator, and a discharge electrode disposed above the ground electrode is provided, and a mass-shaped cover is placed on the ground electrode in the liquid tank. In a discharge crushing apparatus for bringing the tip of a discharge electrode into contact with a treatment object and crushing the treatment object by pulse discharge of a high-voltage current in a liquid, the ground electrode has a planar outer shape formed in a rectangular shape, On the other hand, the discharge electrode is constituted by a classifying sieve for classifying the object to be treated while moving it in the long axis direction, while the discharge electrode is supported at its base by a supporting shaft provided on the upper part of the liquid tank, and the tip in the liquid. Part freely rotatable in the direction of movement of the object to be processed, and on the tip and the ground electrode below Characterized in that it is arranged at a predetermined small gap between the.

Further, the ground electrode may be arranged so as to be inclined in the major axis direction, and may be configured as a vibration classifying screen for moving the object to be treated, which has been charged by being vibrated by the vibrating means, in the inclination direction. .

Further, the discharge electrode is formed by applying an insulating sleeve made of an insulating material to the outer circumference of the tip portion to be immersed in the liquid, and forming the tip exposed from the insulating sleeve into a hemispherical shape. Good.

Further, the discharge electrode is supported by an upper side surface thereof in contact with a holding member provided on the upper part of the liquid tank, is freely rotatable in the moving direction of the object to be processed, and is vertical from the object to be processed. It may be held at a predetermined inclination angle in the moving direction of.

An angle detector is provided above the liquid tank for detecting a change in the rotation angle of the discharge electrode and outputting the change in the rotation angle as an electric signal to the control unit of the high voltage pulse generator. It may be provided.

A plurality of the discharge electrodes may be coaxially and individually rotatably supported by the support shaft, and a plurality of discharge electrodes may be arranged at predetermined intervals in the width direction of the ground electrode.

In the above-mentioned electric discharge crushing device of the present invention, the grounding electrode immersed in the liquid in the liquid tank is configured as a classifying sieve for classifying while moving the object to be treated in the long axis direction. On the other hand, the discharge electrode placed above this ground electrode,
With the support shaft that supports the base on the liquid surface as a fulcrum, the tip is configured to be freely rotatable in the moving direction of the object to be processed, so that the object to be processed continuously supplied from above the liquid tank is grounded. The electrode can be moved in one direction on the electrode, automatically brought into contact with the tip of the discharge electrode disposed above, and continuously crushed by pulse discharge of high-voltage current from the discharge electrode.
Further, since the discharge electrode is arranged at a predetermined small interval between the tip of the discharge electrode and the upper surface of the ground electrode, the discharge electrode does not come into contact with an object to be processed smaller than the interval, but an object to be processed larger than that. In the case of, it is pushed by the moving processing body and rotates,
Since the distance between the tip and the upper surface of the ground electrode is increased to get over the object to be processed, the tip can be surely and autonomously contacted regardless of its size, and thus the object having a size larger than a predetermined size can be contacted. It is possible to crush by selective pulse discharge with respect to.

Further, the ground electrode is configured as a vibrating classifying screen which is arranged so as to be inclined in the major axis direction and which is vibrated by vibrating means to move the object to be treated in the tilt direction, and the width of this ground electrode is widened. By giving a vibration mainly reciprocal vibration in the direction, the loaded massive objects are arranged so as not to overlap each other and brought into contact with the mounting surface of the ground electrode,
It is possible to quickly classify small particles below the specified size, while moving the object to be crushed sequentially forward.

Further, the discharge electrode is formed by applying an insulating sleeve made of an insulating material to the outer periphery of the tip portion immersed in the liquid, and forming the tip exposed from the insulating sleeve in a hemispherical shape. As a result, the tip can be surely brought into contact with the object to be processed and pulse discharge can be performed without being influenced by the rotation angle.

Further, the discharge electrode is freely rotatable in the moving direction of the object to be processed by a holding member provided on the upper part of the liquid tank, and at a predetermined inclination angle from the vertical direction to the moving direction of the object to be processed. By holding it at an angle, this discharge electrode can be smoothly rotated by the moving processing body, and furthermore, it is subjected to an impact in the axial direction toward the fulcrum by the vibrating ground electrode and the processing target body. It can be prevented from being damaged.

In addition, a change in the rotation angle of the discharge electrode is detected on the upper portion of the liquid tank, and the change in the rotation angle is output as an electric signal to the control unit of the high voltage pulse generator. By providing an angle sensor, the tip of the discharge electrode is pushed by a moving processing object to rotate, and the tip goes over the object to be treated, and from that time point, the tip of the discharge electrode moves back to the original position. To the control unit of the high voltage pulse generator, and when the tip of the discharge electrode is in the optimum contact position with respect to the object to be processed, that is, the discharge electrode is rotated from the movement direction of the object to the original position. When the tip is located at the upper part of the object to be processed after the transition to the return, it is possible to automatically perform pulse discharge and effectively fracture.

Further, the discharge electrode is coaxial with the support shaft,
Further, by independently pivoting independently and disposing a plurality of ground electrodes at predetermined intervals in the width direction of the ground electrode, even if the ground electrode is formed to have a wide width, it is possible to move on the ground electrode. The tip of each discharge electrode can be brought into contact with each body to perform pulse discharge, which can enhance the crushing efficiency.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. [FIG. 1] is a drawing showing a schematic configuration of one embodiment of an electric discharge crushing device according to the present invention, in which (a)
The figure is a vertical cross-sectional view showing the overall configuration and arrangement, (b) is a top view showing the configuration of the main part, and (c) is a cross-sectional view showing the configuration of the main part.

In FIG. 1 (a), (1) is a liquid tank, and this liquid tank (1) is an inverted trapezoidal upper open type in which the front and rear lower side walls are inclined toward the center. In the tank, on top of it, the lumpy object (B) is conveyed by the supply conveyor (C ₁ )
With a hopper-shaped input (1b) for receiving
(1a) is provided, and a sludge discharge part (1c) is provided on the lower bottom part. Further, the liquid tank (1) has an overflow portion (not shown), stores water (W) sent from a supply source (not shown) in a regulated water surface, and stores the regulated water surface. The lower end of the charging part (1b) is partly immersed below.

(2) is a grounding classification electrode, and this grounding classification electrode (2) is constituted by a vibration classification sieve similar to a vibration feeder used for ordinary solid classification, and the rear part is It is located below the input part (1b) of the tank (1), the front part is tilted downward with a small inclination angle, it is immersed in the water (W) in the liquid tank (1), and it is electrically connected. It is grounded.

Here, as shown in FIG. 2 (b), the grounding classification electrode (2) is a flat plate-shaped grizzly river having a narrow width toward the tip on a frame body (2a) having a rectangular outer shape. (2b) are arranged side by side to form the placement and classification surface of the object to be treated (B) on the top surface, and the support parts (2c) on both the front and back sides are shaken to the side wall of the liquid tank (1) via the ammunition. While being movably supported, the rear part of the upper mount (1a)
Oscillator installed behind the injection part (1b) located on the water surface of
It is linked to (6). Then, under this configuration, the oscillator (6) gives a vibration mainly due to reciprocal vibration in the width direction, and the block-shaped object to be processed is loaded through the charging part (1b).
(B) Each of them is arranged side by side so as not to overlap each other and brought into contact with the placement and classification surface, and sequentially moved forward. Also,
By forming a classification surface on which the object to be processed (B) is placed by the grizzly river (2b) that narrows toward the tip, small particles below the specified size can be classified early, while the object to be crushed
The forward movement of (B) is made smooth.

(3) is a discharge electrode.
In (3), each base (3a) is individually attached to the support shaft (4) provided in the part located on the water surface in front of the input part (1b) of the upper mount (1a) of the liquid tank (1). The tip is immersed in water (W) in the liquid tank (1) so that it can rotate freely and is coaxially supported, and the ground classification electrode (2) is placed above the ground classification electrode (2). A plurality of them are arranged at a predetermined interval in the width direction. Each discharge electrode (3) is connected to a high voltage pulse generator (5) arranged outside the liquid tank (1).

Here, the discharge electrode (3) has a rod-shaped discharge iron core (3b) whose tip is formed into a hemispherical shape, and as shown in FIG. 3 (c), the outer periphery of the base (3a) is sintered with ceramic. Insulates like an insulator with a discharge core (3) that is immersed in water (W).
b) Insulation sleeve made of insulating material such as polyethylene on the outer circumference
(3c) is adhered and the hemispherical tip of the discharge iron core (3b) is exposed from the insulating sleeve (3c). Further, the base (3a) is supported by the support shaft (4), and the front side surface of the base (3a) is provided on the upper mount (1a).
By being supported by contacting with (8), the tip end will move to the arrow A in the figure.
As shown in Fig. 3, the object to be treated (B) on the ground classification electrode (2) can be freely rotated in the direction of movement and is inclined from the vertical direction at a predetermined inclination angle θ, and the discharge core (3b ) A predetermined small gap G is held between the tip and the upper surface of the ground classification electrode (2).

On the other hand, the holding member (8), which abuts and supports the base portion (3a) of the discharge electrode (3), detects a change in the rotation angle of the discharge electrode (3) and detects the rotation angle of the detected rotation angle. Angle detector that outputs fluctuations as electric signals to the control unit of the high-voltage pulse generator (5)
(9) is installed internally. The high-voltage pulse generator (5) connected to each discharge electrode (3) is equipped with an amplifying rectifier and has a pulse voltage of 200 to 700 kV and a high voltage current of pulse discharge energy of 0.5 to 160 KJ. According to the command from the control unit based on the signal from (9), it is output to each discharge electrode (3) at the set pulse frequency.

On the other hand, in the liquid tank (1), the liquid surface reaches the rear liquid surface along the rear side wall inclined from the lower bottom of the liquid tank (1),
A take-out conveyor that takes out crushed products that drop through the grounded classification electrode (2) and carries them out to the external product conveyor (C ₂ ).
(7) is provided.

In this embodiment, a hard block-like object (B) such as a rock or a concrete block having a diameter of about 200 mm is set to 20 mm.
For the purpose of crushing to the following particle sizes, the water (W) to be stored in the liquid tank (1) is industrial water with a resistivity of 8 × 10 ³ Ωcm, and each discharge electrode (3) is Oblique angle θ is 25 degrees, ground classification electrode
The distance G from (2) is set to 15 mm, and the distance between them in the width direction is set to 30 mm. From the high voltage pulse generator (5), the pulse frequency is
A high voltage current selected from the range of 1 to 10 times / sec and pulse voltage of 200 to 420 kV is output.

In the discharge crushing device of this embodiment having the above-mentioned structure,
The block-shaped object to be treated (B) continuously supplied from above through the charging part (1b) of the liquid tank (1) is configured as a kind of vibrating classifier to form water ( W) Grounding classification electrode immersed in
While moving it forward in sequence on the placing and classifying surface of (2), automatically contact the tip of the discharge iron core (3b) of the discharge electrode (3) placed above it to remove it from each discharge electrode (3). It can be crushed continuously by the underwater pulse discharge of high voltage current, and the crushed products that have been crushed and dropped through the placement classification surface of the ground classification electrode (2) can be carried out to the outside by the extraction conveyor (7). Also, the liquid tank
(1) The fine particles deposited on the bottom are sludge discharge part (1
It can be discharged and collected from c), and hard lumps such as rocks and concrete lumps can be continuously crushed.

Here, each discharge electrode (3) is inclined at the inclination angle θ (25 °) from the vertical direction, and the gap G (15 mm) is provided between the tip of the discharge electrode (3) and the ground classification electrode (2). Since it is held at a certain distance, the vibrating ground classification electrode (2) and the object to be processed (B) are prevented from being damaged by an impact in the axial direction toward the upper fulcrum.

FIG. 2 is an explanatory view of its operation.
As shown in Fig. (a), the discharge electrode (3) has the above-mentioned gap G (15 m).
Although it does not contact the object to be treated (B) smaller than m), if it is larger than that, it is pushed by the object (B) that has moved on the ground classification electrode (2) and is relatively small. In
As shown in Figure (b), it is rotated at a small angle α, and for larger ones, it is rotated at a large angle α ', as shown in Figure (c). Since the distance from the upper surface of the classification electrode (2) is increased and the object to be processed (B) is overcome, the tip of the discharge iron core (3b) can be surely and autonomously contacted regardless of its size. Therefore, the object (B) to be crushed can be crushed by pulse discharge selectively. Further, since the insulating sleeve (3c) is attached to the outer periphery of the discharge iron core (3b) at the tip portion thereof, and the tip of the discharge iron core (3b) exposed from the insulating sleeve (3c) has a hemispherical shape, The tip of the discharge iron core (3b) can be surely brought into contact with the object to be processed (B) without being influenced by the rotation angle.

On the other hand, the discharge electrode (3) is a moving treatment object.
The discharge iron core (3b) is pushed by (B) to rotate, then the tip of the discharge iron core (3b) gets over the object (B) to be processed, and from that time point, it returns to the original position. The angle detector (9) detects the movement of the tip of the electrode (3), that is, the change in the rotation angle, and transmits it to the control unit of the high-voltage pulse generator (5).
When the tip of the discharge iron core (3b) is in the optimum contact position with respect to the object to be processed (B), that is, the discharge electrode (3) moves from the rotation of the object to be processed (B) in the moving direction to the original position. Pulse discharge automatically when the tip of the discharge iron core (3b) is located above the object to be processed (B) as shown in (b) and (c). This allows effective and automatic crushing. Also, the discharge electrode (3) is a ground electrode.
Even if the ground electrode (2) is widened, the ground electrode (2) is widened because a plurality of them are arranged at a predetermined interval (30 mm) in the width direction of (2).
The tip of the discharge iron core (3b) of each discharge electrode (2) can be brought into contact with each of the objects to be processed (B) moving above, and pulse discharge can be performed, whereby crushing efficiency can be increased. As described above, in the electric discharge crushing device of the present embodiment, it is possible to continuously and efficiently crush a hard lump-shaped object to be processed such as a rock or a concrete lump under a simple structure with few working wear portions. You can

The above example is one embodiment of the present invention, and the present invention is not limited to this configuration. That is, the ground electrode to be immersed and placed in the liquid in the liquid tank is configured as a classifying sieve for classifying while moving the charged object to be processed, and a discharge electrode for pulse-discharging a high-voltage current to the object to be processed. Is rotatably provided in the moving direction of the object to be processed, and the tip thereof is automatically brought into contact with the object to be processed and continuously crushed by pulse discharge, so long as it does not depart from the gist of the present invention. It may be configured differently from. For example, in the above example, the industrial water is stored in the upper open type liquid tank, and the hard lump-shaped object to be treated such as rock or concrete lump is continuously crushed by the underwater pulse discharge at room temperature. Is a structure in which a low-temperature liquefied gas such as liquefied nitrogen is contained in a closed or semi-closed liquid tank, and the low-temperature liquefied gas causes low-temperature embrittlement of an object to be treated, such as a rubber tire, which is difficult to crush at room temperature. It may be treated as something. Further, in the above embodiment, the ground classification electrode is configured as a vibration classification sieve, but by controlling the loading side and the like, the contact between the placement classification surface and the individual objects to be charged is sequentially ensured. As long as it can be transferred, for example, a conveyor system having an endless belt having a classification mesh may be used. Depending on the purpose, the objects to be processed may be arranged in a line and moved, and a single discharge electrode may be used to sequentially perform pulse discharge to continuously crush the objects.

[0033]

As described above, in the electric discharge crushing apparatus according to the present invention, the continuously fed object to be treated is moved on the ground electrode which is disposed by being immersed in the liquid in the liquid tank, and the grounding is performed. With respect to the object to be processed moving on the electrodes, the tip of the discharge electrode provided freely rotatable is automatically contacted to generate a pulse discharge, that is, with a simple structure with few operation wear parts, The object to be treated can be crushed continuously and efficiently.

[Brief description of the drawings]

1A and 1B are drawings showing a schematic configuration of an embodiment of an electric discharge crushing device according to the present invention, in which FIG. 1A is a vertical cross-sectional view showing the overall configuration and arrangement, and FIG. The top view and (c) are sectional views showing the structure of the main part.

FIG. 2 is an operation explanatory view of a main part of one embodiment of the electric discharge crushing device according to the present invention.

FIG. 3 is a schematic explanatory view of a conventional electric discharge crushing device.

FIG. 4 is a schematic explanatory view of another conventional electric discharge crushing device.

[Explanation of symbols]

(1) --Liquid tank, (1a)-Upper mount, (1b)-Injection part, (1c)-Sludge discharge part, (2)-Ground classification electrode, (2a)-Frame, (2b)-
Grizzly river, (2c)-Support, (3) --Discharge electrode, (3a)-
Base, (3b)-Discharge iron core, (3c)-Insulation sleeve, (4)-Support shaft, (5)-High voltage pulse generator, (6)-Oscillator, (7)
--Take-out conveyor, (8) --Holding member, (9)-Angle detector,
(B) --Processed object, (C ₁ )-Supply conveyor, (C ₂ )-Product conveyor, (W) --Water, G--Interval, θ--Inclination angle.

Claims (6)

[Claims] 1. A liquid tank containing a weakly conductive liquid, a high-voltage pulse generator arranged outside the liquid tank, a liquid immersion inside the liquid tank, and a high-voltage pulse generator. A ground electrode that has a mounting surface and is electrically grounded, and the tip is immersed in the liquid in the liquid tank, and the base located on the liquid surface is connected to the high-voltage pulse generator. , A discharge electrode disposed above the ground electrode, and the tip of the discharge electrode is brought into contact with the lump-like object to be processed loaded on the ground electrode in the liquid tank, thereby In a discharge crushing device for crushing an object to be processed by electric current pulse discharge, the ground electrode is formed into a rectangular outer shape of a plane, and a classification sieve for classifying the charged object to be processed while moving in the long axis direction. On the other hand, the discharge electrode is pivotally supported at its base part on a support shaft provided on the upper part of the liquid tank. The tip portion in the liquid is rotatably movable in the moving direction of the object to be processed, and is provided at a predetermined small interval between the tip and the lower surface of the ground electrode. Electric discharge crusher. 2. The ground electrode is arranged so as to be inclined in the major axis direction, and is configured as a vibration classifying screen that moves the object to be processed that has been charged by being vibrated by vibrating means in the inclination direction. The electric discharge crushing device according to claim 1. 3. The discharge electrode is formed by applying an insulating sleeve made of an insulating material to the outer periphery of the tip portion to be immersed in the liquid, and forming the tip exposed from the insulating sleeve in a hemispherical shape. Or the electric discharge crushing device according to 2. 4. The discharge electrode is supported by an upper side surface abuttingly supported by a holding member provided on the upper portion of the liquid tank, is freely rotatable in the moving direction of the target object, and is vertical from the target object. The electric discharge crushing device according to claim 1, wherein the electric discharge crushing device is held while being inclined at a predetermined inclination angle toward the moving direction of the electric field. 5. An angle detector, which detects a change in the rotation angle of the discharge electrode and outputs the change in the rotation angle as an electric signal to a control unit of the high voltage pulse generator, in the upper part of the liquid tank. The discharge crushing device according to claim 1, 2, 3 or 4, which is provided. 6. The discharge electrode is coaxial with the support shaft,
And a plurality of individually rotatably supported shafts arranged at predetermined intervals in the width direction of the ground electrode.
The electric discharge crushing device according to 4 or 5.