JP4652069B2 - Electric discharge crusher - Google Patents

Description

  The present invention relates to a discharge crushing device, and more particularly to a connection device between an electrode and a discharge control device that supplies power to the electrode.

  An electric discharge crushing method using an electric discharge crusher is known for crushing destruction objects such as rocks and concrete. For example, as shown in FIG. 7, an electrolytic solution filling hole 61 is formed in the destruction target 60 in advance, and an electrolytic solution 63 such as water is filled in the electrolytic solution filling hole 61, and a discharge crushing device is placed in the electrolytic solution 63. A 50 A electrode 70 is inserted, and a large current pulse is applied to the electrode 70 to cause discharge. Since the electrolytic solution 63 is turned into plasma by the discharge energy and generates a pressure wave, the destruction target 60 is crushed by crushing the periphery of the electrolytic solution filling hole 61 with the pressure wave. The discharge crushing device 50A is connected to a pulse power source 80 as a discharge control device composed of a circuit having a capacitor 82 and a switch 83; 84 having a large capacity (for example, about 500 kJ) and one pole 82a of the capacitor 82. And a power supply unit 81 such as a generator connected to the other pole 82b of the capacitor 82 via the switch 83, one electrode connected to one pole 82a of the capacitor 82, and the other pole 82b of the capacitor 82. The other electrode connected via the switch 84, and the electrode 70 formed with the insulator which insulates these one electrode and the other electrode are provided. The electrode 70 and the pulse power source 80 are connected by a coaxial cable 71 and a connector part 72 as electric wires. Although not shown, the circuit of the pulse power source 80 is grounded.

  As shown in FIG. 7; FIG. 8, the electrode 70 is, for example, an inner conductor shaft 73 as one electrode, a cylindrical insulator 74 that covers the outer periphery of the inner conductor shaft 73, and an outer periphery of the cylindrical insulator 74. The outer conductor 75 is provided. The outer conductor 75 is formed by a plurality of outer conductor constituting bodies 76 provided at intervals in a direction along the axis of the inner conductor shaft 73. A distal-end-side discharge gap 77 that generates a discharge between the distal end portion 73t of the inner conductor shaft 73 that protrudes from the distal end 74t of the cylindrical insulator 74 and the distal end portion 76t of the external conductor constituting body 76 that is closest to the distal end portion 73t. An intermediate discharge gap 78 is formed, and discharge is generated between the end portion 76s and the end portion 76s of the opposing outer conductor structure 76. A plurality of intermediate discharge gaps 78 are formed.

  After the electrode 84 is inserted into the electrolyte solution 63 in the electrolyte solution filling hole 61 of the object 60 to be destroyed while the switch 84 and the switch 83 are in a non-conductive state, the switch 83 is turned on to connect the capacitor 82 to the capacitor 82 from the power supply unit 81. Accumulate charge. Then, when the switch 84 is turned on and the electric charge stored in the capacitor 82 is applied to the electrode 70, a discharge is generated in the front end side discharge gap 77, and the electrolytic solution 63 is turned into plasma by this discharge energy to generate a pressure wave. Similarly, discharge is generated in the plurality of intermediate discharge gaps 78, and the electrolytic solution 63 is turned into plasma by this discharge energy to generate pressure waves. The destruction target 60 is crushed by these pressure waves.

  The electrode 70 having the discharge gaps 77 and 78 and a pulse power source 80 as a discharge control device are connected via a connector portion 72. The connector 72 has a cable-side connector (not shown) provided at the other end of the coaxial cable 71 connected at one end to the pulse power source 80 and an electrode-side connector (not shown) provided at the rear end of the electrode 70. Connected and configured. By this connector portion 72, the inner conductor shaft 73 that forms the positive electrode of the electrode 70 and the positive electric wire in the coaxial cable 71 are electrically connected, and the outer conductor 75 that forms the negative electrode of the electrode 70 and the negative electrode in the coaxial cable 71. An electric wire is electrically connected.

In the above configuration, the connector portion 72 is provided at the rear end of the electrode 70, and the length of the coaxial cable 71 as the electric wire connected to the pulse power source 80 is determined. When the electrodes 70 are arranged one by one in the plurality of electrolyte filling holes 61 and the crushing operation is performed, if the coaxial cable 71 does not reach the rear end of the electrode 70 when switching the electrodes 70, the pulse power It may be necessary to move the source 80 or even the power supply unit 81. In this case, when the electrode 70 is switched, a completely different kind of work such as a work of moving the pulse power source 80 or the power supply unit 81 and a work of connecting the coaxial cable 71 to the electrode 70 must be performed. The switching work becomes complicated. Therefore, in order not to perform the operation of moving the pulse power source 80 or the power supply unit 81, the difference in distance between the electrode 70 disposed in the electrolyte solution filling hole 61 and the pulse power source 80 is taken into consideration. A coaxial cable 71 having a length reaching the pulse power source 80 is connected to each electrode 70, a connector is provided between the pulse power source 80 and the coaxial cable 71, and the coaxial cable 71 is connected to the pulse power source 80. Can be considered. In this way, when the electrode 70 is switched, it is only necessary to attach and detach the coaxial cable 71 to and from the pulse power source 80. Further, using one coaxial cable 71 having a length that can be connected to the electrode 70 farthest from the pulse power source 80, the coaxial cable 71 is successively connected to the electrodes 70 disposed in the different electrolyte filling holes 61. It is also possible to switch the electrode 70 by performing an operation of changing the connection. However, in these cases, the amount (length) of the required coaxial cable 71 increases, which is economically disadvantageous.
JP 2003-31175 A JP 2003-320268 A

  The problem to be solved by the invention is that the conventional electric discharge crushing apparatus does not perform the pulse power source or the moving operation of the power supply unit when crushing the destruction target object such as the rock using a plurality of electrodes. When the electrodes are switched to each other, the amount (length) of an electric wire such as a coaxial cable required for connection between the pulse power source and the plurality of electrodes is increased, which is economically disadvantageous.

In the present invention, a discharge wave is generated by applying discharge energy to an electrolytic solution provided on the inner side of an object to be destroyed through an electrode to turn the electrolyte into plasma, and the pressure wave causes the electric discharge to break the object to be destroyed. a crushing apparatus, comprising a connecting device for connecting the electrode and the discharge control device, the connecting device is provided with an electrical connection of the connected connectors with wires to the electrodes, the electrical connection portion of the discharge control device In the electric discharge crushing apparatus connected to the electric wire , the electrical connection portion includes a sandwiching portion that sandwiches the connector and maintains electrical contact with the connector . Further, clamping unit, and the conductor fixed plate, the movable plate facing the conductor fixed plate, the movable plate an urging force in a direction to press the inserted connectors to conductors fixed plate between the conductive fixed plate and the movable plate The elastic means maintains the gap between the opposed conductor fixing plate and the movable plate at a distance narrower than the thickness of the connector, and the connector is press-fitted between the opposed conductor fixed plate and the movable plate. In this case, the movable plate is biased in the direction of the conductor fixing plate to maintain the electrical contact between the connector and the conductor fixing plate, and the connecting device accommodates the electrical connection portion and electrically Insulation box with an opening for inserting the connector in the connection part, and an insulation cover that covers the connection element connected to the electrical connection part, Provided with a connected positive electrode connector and a negative electrode connector connected to the negative electrode of the electrode with an electric wire The connecting device includes an electrical connection portion for connecting the positive electrode connector and an electrical connection portion for connecting the negative electrode connector, and the electrode and the electric wire are electrically connected to each other. It is also characterized by having a connector that can be contacted and separated, and having a plurality of wires having different lengths as wires that connect the connector and the electrode.

According to the present invention, since the connection device includes an electrical connection portion of a connector connected to the electrode by an electric wire, and the electrical connection portion is connected to the electric wire from the discharge control device, a plurality of locations of the destruction target object When the crushing operation is performed by arranging the electrodes one by one, the electric wires connecting the discharge control device and the connection device can be shared, and the electric wires need only be connected between the connection device and the electrodes. with the amount of wire required to connect the control unit and a plurality of electrodes (length) can be reduced, sandwiching part electrical connections is, to maintain electrical contact with the attaching and connectors sandwiching the connector Therefore, the connection switching operation of the connector to the connection device is only required to attach / detach the connector to / from the holding part, and the connection switching operation can be performed easily and easily.
The sandwiching portion includes a conductor fixing plate, a movable plate facing the conductor fixing plate, and elastic means, and when the connector is press-fitted between the elastic means facing the conductor fixing plate and the movable plate, the connector and the conductor are fixed. Since the electrical contact with the plate is maintained, the electrical contact state between the connector and the conductor fixing plate is reliably maintained, and a highly reliable electrical connection portion can be realized. In addition, the connector connection switching operation for the electrical connection portion can be performed easily and easily.
Since the electrical connection portion and the outside are reliably insulated by the insulating box and the insulating lid of the connection device, a highly safe connection device is realized.
Since the connection device includes the electrical connection part for connecting the positive electrode connector and the electrical connection part for connecting the negative electrode connector separately from each other, the configuration of the electrical connection part can be simplified.
Since the electrode and the electric wire are equipped with a connector that allows the electrode and the electric wire to be electrically connected to and separated from each other, the electric wire having a length that can be connected to the electrode farthest from the connecting device is used, and the electric wire is different. It is also possible to switch the electrodes by performing an operation of changing to the electrodes arranged at different positions of the destruction target. Also in this case, since the electric wire for connecting the discharge control device and the connection device can be shared, it is only necessary to connect the electric wire between the connection device and the electrode, so it is necessary for the connection between the discharge control device and the plurality of electrodes. The amount (length) of the electric wire can be reduced, which is economically advantageous.
Since there are multiple wires with different lengths as the wires that connect the connector and the electrode, considering the difference in distance between the electrode placed at different positions of the object to be destroyed and the connection device, depending on the distance By connecting to the electrode using a long length of electric wire, when crushing work is performed using a plurality of electrodes arranged at different positions of the object to be destroyed, it is connected to the electrical connection part of the connection device By simply switching the connector, it is possible to cause discharge crushing one after another with electrodes arranged at different positions. Therefore, it is possible to efficiently crush a destruction target such as a relatively large bedrock.

Embodiment 1
FIG. 1 shows the relationship between the electrode and the connection device of the electric discharge crushing device according to Embodiment 1, FIG. 2 shows the plane of the connection device, FIG. 3 shows the connection operation of the connector to the electrical connection portion of the connection device, FIG. 4 shows a concept of a method for crushing a target to be destroyed using a plurality of electrodes. In addition, the same code | symbol is attached | subjected to FIG. 7 which shows a conventional apparatus, or an equivalent part.

  In FIG. 1, 1 is an electrode, 2 is a connection device for connecting the electrode 1 and a pulse power source 80 as a discharge control device, 3; 4 is a connector formed by a flat conductor connected to the connection device 2. It is. The electrode 1 is formed of, for example, an inner conductor shaft 73, a cylindrical insulator 74 that covers the outer periphery of the inner conductor shaft 73, and an outer conductor 75 provided on the outer periphery of the cylindrical insulator 74 as in FIG. The The inner conductor shaft 73 as the positive electrode of the electrode 1 and the positive electrode connector 3 are connected to each other through the electric wire 5, and the outer conductor 75 as the negative electrode of the electrode 1 and the negative electrode connector 4 are connected to each other through the electric wire 6. The The electric wires 5; 6 are covered electric wires in which the conductor core wire is covered with an insulator. The connectors 3; 4 are electrically connected to one end side of the wires 5; 6, and the wires 5; 6 cannot be attached to or detached from the connectors 3; The other end side of the electric wires 5; 6 is electrically connected to the electrode 1 via the connectors 7; 8, and the electric wires 5; 6 and the electrode 1 can be attached and detached by the connectors 7; 8. That is, the connector 7 is composed of a wire side connector 7a to which the conductor core wire of the wire 5 is connected and an electrode side connector 7b to which the internal conductor shaft 73 which is the positive electrode of the electrode 1 is connected. In this configuration, the conductor core wire and the inner conductor shaft 73 which is the positive electrode of the electrode 1 can be electrically connected to and separated from each other. The connector 8 includes a wire-side connector 8a to which the conductor core wire of the electric wire 6 is connected and an electrode-side connector 8b to which the outer conductor 75 which is the negative electrode of the electrode 1 is connected. The connector 8a; The external conductor 75 which is the negative electrode of the electrode 1 can be electrically connected and separated.

  As shown in FIG. 1; FIG. 2, the connection device 2 includes an electrical connection unit 10. The electrical connection unit 10 includes a positive electrode electrical connection unit 11 to which the positive electrode connector 3 is connected and a negative electrode electrical connection unit 12 to which the negative electrode connector 4 is connected. The positive electrode electrical connection portion 11 includes a clamping portion 13 that sandwiches the positive electrode connector 3 and maintains electrical contact with the positive electrode connector 3. The negative electrode electrical connecting portion 12 also has a similar clamping portion 14. The sandwiching portions 13 and 14 include a conductor fixing plate 15, a movable plate 16 facing the conductor fixing plate 15, and connectors 3 and 4 inserted between the conductor fixing plate 15 and the movable plate 16. And a spring body 17 as an elastic means for applying an urging force in the direction of pressing to the movable plate 16.

  A positive wire 21 of a power cable 20 from a pulse power source 80 serving as a discharge control device is connected to a conductor fixing plate 15 to which the positive electrode connector 3 comes into contact via connection conductors 22 and 23, and a negative electrode connector 4 is connected to the positive electrode connector 3. The negative electrode wire 25 of the power cable 20 from the pulse power source 80 is connected to the conductor fixing plate 15 in contact via the connection conductors 26 and 27. In the power cable 20, the outer periphery of the conductor core wire that forms the positive electrode wire 21 is covered with an insulator 28, and the mesh conductor wire that forms the negative electrode wire 25 of the power cable 20 is provided on the outer periphery of the insulator 28. This is a coaxial cable having a structure in which the outer periphery of the wire 25 is covered with an insulator. The pulse power source 80 and the power supply unit 81 are electrically connected by a power cable 85, and power from the power supply unit 81 is supplied to the pulse power source 80.

  The housing 30 </ b> A of the connection device 2 includes an insulating box 31 that is open at the top, in which the electrical connection unit 10 and the connection unit 30 of the power cable 20 are accommodated, and an insulating inner lid 32 that covers the connection cable 30. The upper part of the insulating box 31 is closed, and the insulating upper cover 33 is formed to cover the connectors 3 and 4 connected to the electrical connection part 10. The insulating box 31 includes a bottom plate 34, one end wall 36 that is a wall on the side where the power cable insertion hole 35 is formed, another end wall 37 that is a wall opposite to the one end wall 36, and one end wall 36. It is a rectangular box with an open top formed with both side walls 38; 39, which are walls that connect the end with the other end wall 37. The electrical connection portion 10 and the connection portion 30 of the power cable 20 are separated by a partition plate 40 that is parallel to the one end wall 36 and the other end wall 37 and is provided at a substantially intermediate position between the one end wall 36 and the other end wall 37. It has been. The positive electrode connecting portion 11 and the negative electrode connecting portion 12 of the electrical connecting portion 10 are partitioned by a partition plate 41 provided so as to face the both side walls 38; The The conductor fixing plates 15; 15 are provided inside the side walls 38; 39 of the insulating box 31, and the movable bodies 16; 16 are provided on the partition plate 41 side. A spring body 17 is provided between the movable plate 16; 16 and the partition plate 41, and the spring body 17 as an elastic means biases the movable plate 16 toward the conductor fixing plate 15.

  As shown in FIG. 3 (a), the distance between the movable plate 16 and the conductor fixing plate 15 in the state where the movable plate 16 is biased in the direction of the conductor fixing plate 15 by the spring body 17 is the connector 3; The dimension is maintained smaller than the plate thickness. Therefore, for example, when the positive connector 3 is press-fitted between the movable plate 16 and the conductor fixing plate 15, the spring body 17 biases the movable plate 16 toward the conductor fixing plate 15 by the press-fitting of the connector 3. Thus, electrical contact between the connector 3 and the conductor fixing plate 15 is maintained (see FIG. 3B). The negative electrode connector 4 is similarly connected. Therefore, the electrical contact state between the connectors 3; 4 and the conductor fixing plates 15; 15 is reliably maintained, and the highly reliable electrical connection portion 10 can be realized. Further, the connection switching operation of the connectors 3; 4 with respect to the electrical connection portion 10 can be easily performed.

  In addition, an insulating upper lid 33 is covered to cover the connectors 3; 4 press-fitted between the conductor fixing plate 15 and the movable plate 16. Further, the connection portion 30 of the power cable 20 is covered with an insulating inner lid 32. Therefore, since the electrical connection portion 10 and the connection portion 30 of the power cable 20 are reliably insulated from the outside by the insulating box 31; the insulation middle lid 32; the insulation upper lid 33, a highly safe connection device is realized.

  According to the first embodiment, as shown in FIG. 4, the electrode 1 and the electric wire 5; 6 connected to the electrode 1; and the connector 3; 4 connected to the electric wire 5; A plurality of types of electrodes 1 having electric wires 5; 6 are prepared. And considering the difference in the distance between the electrodes 70 arranged in the plurality of different electrolyte filling holes 61 formed in the fracture target object 60 such as a rock and the connection device 2, the length according to the distance By selecting the electrode 1 to which the electric wires 5; 6 are connected and arranging the electrodes 1 in the electrolyte solution filling holes 61, the electrodes 1 are arranged one by one in the plurality of electrolyte solution filling holes 61 provided in the destruction target 60 such as a rock. When the crushing operation is performed by arranging one electrode 1, it is arranged one by one in the plurality of electrolyte filling holes 61 simply by switching the connectors 3; 4 connected to the electrical connection portion 10 of the connection device 2. It is possible to cause discharge crushing one after another with the electrode 70. Accordingly, it is possible to switch the electrode 1 for performing the electric discharge crushing only by switching the connectors 3; 4 connected to the electrical connection portion 10 of the connecting device 2, and to destroy a relatively large rock or the like. 60 can be efficiently crushed. In the case of the first embodiment, since the power supply cable 20 that connects the pulse power source 80 and the connection device 2 can be shared, the amount (length) of the electric wire required for connection between the pulse power source 80 and the plurality of electrodes 1 ) Can be reduced, which is economically advantageous compared to the conventional case. In addition, the connection switching of the connectors 3; 4 to the connection device 2 is performed simply by attaching / detaching the connectors 3; 4 to / from the sandwiching portions 13; 14, so that the connection switching operation can be performed easily and easily. In addition, since the connecting device 2 is provided with the positive electrode connecting portion 11 for connecting the positive electrode connector 3 and the negative electrode connecting portion 12 for connecting the negative electrode connector 4 separately from each other, The configuration of the general connection unit 10 can be simplified.

Embodiment 2
A connector 7; 8 that allows the electrode 1 and the electric wires 5; 6 to be electrically connected to and separated from each other is provided, so that a set of electric wires 5 having a length connectable to the electrode 1 located farthest from the connecting device 2; It is possible to switch the electrode 1 by performing an operation of connecting the electric wire 5; 6 to the electrode 1 disposed in the different electrolyte solution filling hole 61 using 6. Also in this case, since the power cable 20 can be shared as an electric wire connecting the pulse power source 80 and the connection device 2, the amount (length) of the electric wire required for connecting the pulse power source 80 and the plurality of electrodes 1. Therefore, it is economically advantageous compared to the conventional case.

Embodiment 3
The sandwiching portions 13; 14 may be configured as shown in FIG. That is, the sandwiching portions 13; 14 are configured by the leaf springs 47 formed in a concave shape in which the distance between the upper openings 45 corresponds to the plate thickness of the connectors 3; Such a sandwiching portion 13; 14 can also realize a highly reliable electrical connection portion 10 and can easily and easily switch the connection of the connectors 3; 4 to the electrical connection portion 10.

  As shown in FIG. 3; FIG. 5, by forming the tip of the lower end of the connector 3; 4 into a pointed inverted triangular shape, the connector 3; 4 is sandwiched from above the clamping portion 13; 14, which facilitates the connection work of the connectors 3; 4 to the clamping parts 13; 14 and contributes to smoothness.

Embodiment 4
As shown in FIG. 6, the electrode 1 including a cartridge 50 that is a storage body that stores the discharge gaps 77 and 78 and is filled with the electrolytic solution 63 may be used. Depending on the destruction target 60, even when the electrolyte filling hole 61 is filled with the electrolytic solution 63, it may penetrate into the destruction target 60 and be unable to hold the electrolytic solution 63 in the electrolyte filling hole 61. In such a case, the electrode 1 with the cartridge 50 is used to insert the electrode with the cartridge 50 into the electrolyte filling hole 61 of the object 60 to be destroyed while the cartridge 50 is filled with the electrolyte 63. The target object 60 can be crushed by discharging. The cartridge 50 is a container made of rubber, plastic or the like, has a sealing port 51 in contact with the outer periphery of the electrode 1 at the top, and has an electrolyte solution 63 and discharge gaps 77 and 78 inside. After that, the sealing port 51 is used after being adhered to the outer periphery of the electrode 1 with an adhesive or the like.

Only one discharge gap may be provided on at least the tip side of the electrode. For example, an electrode is used in which the ends of the positive and negative wires provided in parallel via an insulator are slightly protruded from the tip of the insulator and a discharge gap is formed between the protruding positive and negative electrode wires. May be.
Further, the connector 3; 4 is connected to the electrical connection portion 11; 12 from the top of the insulating box 31, but the connector 3; 4 is connected to the electrical connection portion 11; 12 from the side of the insulation box 31. It is good also as composition to do.
In the above description, the connectors 3; 4 are formed of a flat conductor, but the connectors 3; 4 may be formed of, for example, a rod-shaped conductor instead of a flat plate. In this case, the electrical connection portions 11 and 12 may be configured to reliably maintain electrical contact with the connector according to the shape of the connector.
Moreover, although the positive electrode connector 3 and the negative electrode connector 4 were physically separated, the coaxial cable provided with the positive electrode conductor and the negative electrode conductor instead of the electric wires 5; 6 was used instead of the electric wires 5; The electrical connection portion 10 of the connection device 2 may be a connection portion such as a connector structure that can connect the positive electrode conductor and the negative electrode conductor of the coaxial cable in an insulated state.

The perspective view which shows the electric discharge crushing apparatus of Embodiment 1 of this invention. FIG. 3 is a plan view of the connection device according to the first embodiment. The figure which shows the connection operation | movement of the connector with respect to the electrical connection part of Embodiment 1. FIG. The figure which shows the concept of the crushing operation | work method of the destruction target object using the some electrode by the electric discharge crushing apparatus of Embodiment 1. FIG. Sectional drawing which shows the clamping part by Embodiment 3. FIG. FIG. 6 is a view showing an electrode including a cartridge according to a fourth embodiment. The figure which shows the conventional electric discharge crushing apparatus and an electrode. It is a figure which shows the electrode of the conventional electric discharge crushing apparatus, (a) is an enlarged view of the front-end | tip part of an electrode, (b) is a BB end surface figure of (a).

Explanation of symbols

1 electrode, 2 connection device, 3 positive electrode connector (connector),
4 Negative electrode connector (connector), 5; 6 electric wire, 7; 8 connector,
10 electrical connection, 11 electrical connection for positive electrode,
12 Electrical connection part for negative electrode, 13; 14 clamping part, 15 conductor fixing plate,
16 Movable plate, 17 Spring body (elastic means), 20 Power cable (electric wire),
31 Insulation box, 33 Insulation top cover, 60 Destruction object,
80 Pulse power source (discharge controller).

Claims (6)

To generate pressure waves by plasma electrolytic solution by applying discharge energy through the electrode to the electrolytic solution provided inside the fracture object crushing breakdown object at this pressure wave discharge crusher met And
Comprises a connecting device for connecting the electrode and the discharge control device, the connecting device is provided with an electrical connection of the connected connectors with wires to the electrodes, the electrical connection portion is connected to a wire from the discharge control unit discharges In the crusher
A discharge crushing apparatus , wherein the electrical connection portion includes a clamping portion that sandwiches the connector and maintains electrical contact with the connector . The sandwiching portion provides the movable plate with a biasing force in a direction to press the conductor fixed plate, the movable plate facing the conductor fixed plate, and the connector inserted between the conductor fixed plate and the movable plate against the conductor fixed plate. When the elastic means maintains the gap between the conductor fixed plate and the movable plate at a distance narrower than the thickness of the connector and the connector is press-fitted between the conductor fixed plate and the movable plate. discharge crushing device according to claim 1, characterized in that to maintain the electrical contact between the connectors and biased in the direction of the conductor fixed plate and the conductive fixing plate movable plate. The connection device includes an insulating box that houses the electrical connection portion and includes an opening for inserting the connector into the electrical connection portion, and an insulating lid that covers the connector connected to the electrical connection portion. The discharge crushing apparatus according to claim 1 or 2, wherein As a connector, a positive electrode connector connected to the positive electrode of the electrode by an electric wire and a negative electrode connector connected to the negative electrode of the electrode by an electric wire, and the connecting device connects the positive electrode connector The electric discharge crushing apparatus according to any one of claims 1 to 3 , wherein the electric connection part for connecting the negative electrode connector and the negative electrode connector is provided separately from each other. The discharge crushing apparatus according to any one of claims 1 to 4 , wherein the electrode and the electric wire are provided with a connector that allows the electrode and the electric wire to be electrically connected to and separated from each other. The electric discharge crushing device according to any one of claims 1 to 5, wherein a plurality of electric wires having different lengths are provided as electric wires for connecting the connector and the electrode.

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