JP2003320268A - Crusher and electrode therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrode for a crusher which efficiently performs a crushing operation by efficiently supplying a medium such as water to an object intended for crushing, and a crusher. <P>SOLUTION: This electrode has a center electrode 3 and an outer peripheral electrode 6 positioned opposite to each other through an insulator 4 and generates a discharge in the medium. In addition, the electrode 1 is equipped with an electrolyte flow path for the medium to pass through, an electrolyte introduction part 7 as a medium supply means, and an electrolyte supply hole 17 as a medium discharge means. The electrolyte flow path is formed between the outer peripheral electrode 6 and the insulator 4. The electrolyte introduction part 7 supplies the medium such as water to the electrolyte flow path. The electrolyte supply hole 17 discharges the medium such as water to the outside of the electrode 1 from the electrolyte flow path. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crushing device electrode and a crushing device, and more particularly to a crushing device electrode and a crushing device having a mechanism for supplying a crushing medium to a crushing target.

[0002]

2. Description of the Related Art The following methods are known as conventional crushing methods for breaking rocks and the like.
First, a lower hole is formed in a rock that is an object to be crushed, and an electrolytic solution such as water is injected into the lower hole. Further, a coaxial electrode is inserted into this pilot hole, and a large current is applied to this coaxial electrode from a pulse power source, so that discharge is generated inside the pilot hole. At this time, the electrolytic solution near the tip of the coaxial electrode is turned into plasma by the discharge energy, so that a pressure wave is generated. Rocks and the like around the coaxial electrode are destroyed by this pressure wave.

[0003]

The above-mentioned conventional crushing device has the following problems. That is,
It is necessary to place water as a medium in the inside of the pilot hole formed in the crushing object beforehand, but this work is done by the operator pouring water from a container such as a bucket into the pilot hole or using a hose. It was done manually by supplying water to the inside of the pilot hole. For this reason, the workability is poor depending on the place where the crushing is performed, and it takes time and labor to supply water, which causes a decrease in the work efficiency of the crushing work.

The present invention has been made to solve the above problems, and an object of the present invention is to efficiently supply a medium such as water to an object to be crushed so that crushing work can be performed. An object of the present invention is to provide a crushing device electrode and a crushing device that can be efficiently implemented.

[0005]

A crushing device electrode according to one aspect of the present invention is a crushing device electrode including a first electrode and a second electrode that generate an electric discharge in a medium and face each other via an insulator. A medium flow path, a medium supply unit, and a medium discharge unit are provided. The flow path is formed between at least one of the one electrode and the other electrode and the insulator. The medium supply means supplies the medium to the flow path. The medium discharging means discharges the medium from the flow path to the outside of the crushing device electrode.

In this way, a flow path is formed inside the crushing device electrode, and water or the like is formed in the vicinity of the region where the crushing device electrode (hereinafter also referred to as an electrode) discharges through the flow path. The medium can be reliably supplied. Therefore, it is possible to efficiently perform the work of supplying the medium such as water in the crushing work. As a result, the work efficiency of the crushing work can be improved.

Further, a flow path for a medium can be easily formed by forming a gap between at least one of the one electrode and the other electrode and the insulator. Therefore, it is possible to suppress an increase in the manufacturing cost of the crushing device electrode by forming the flow path.

Further, since the flow path is formed between the one electrode and the other electrode and the insulator, the flow path is arranged inside the crushing device electrode. Therefore, the flow path for the medium can be formed in the crushing device electrode without substantially changing the outer shape of the crushing device electrode. Therefore, the handling of the crushing device electrode at the crushing site can be performed in substantially the same manner as the conventional electrode.

In the crushing apparatus electrode according to the above aspect 1, one electrode may be a central conductor. The central conductor may have an outer peripheral surface while extending along the central axis. The insulator may be disposed on the outer peripheral surface of the central conductor. The other electrode may be a peripheral conductor arranged so as to surround the central conductor via an insulator. The flow path may be formed between the outer peripheral conductor and the insulator.

In this case, in the so-called coaxial structure crushing device electrode (also referred to as a coaxial electrode), it is possible to secure a flow path for the medium to flow without significantly changing the structure of the coaxial electrode. Further, when the outer peripheral conductor of the coaxial electrode is the negative electrode and the central conductor is the positive electrode, the electrolytic solution such as water flowing through the flow path does not come into direct contact with the central conductor which is the positive electrode. For this reason, it is possible to reduce the risk that a relatively high-voltage current as it is supplied to the crushing device electrode leaks to the outside of the crushing device electrode via water or the like flowing through the flow path.

As a method for forming the above-mentioned flow path,
Forming a groove on the inner peripheral surface of the outer peripheral conductor, or forming a portion of the outer peripheral conductor whose inner diameter is larger than the outer diameter of the insulator, or forming a groove on the outer peripheral surface of the insulator, or A method of forming a portion of the insulator having an outer diameter smaller than the inner diameter of the outer peripheral conductor may be used.

In the crushing device electrode according to the above aspect 1, the medium discharging means includes a discharge hole reaching from the outer peripheral surface of the outer peripheral conductor to the inner peripheral surface of the outer peripheral conductor facing the flow path. Good.

In this case, the medium discharging means can be formed by a relatively simple process of forming a discharging hole in the outer peripheral conductor. Therefore, since the structure of the crushing device electrode can be simplified, an increase in the manufacturing cost of the crushing device electrode can be suppressed.

In the crushing device electrode according to the above aspect 1, the outer peripheral conductor may include outer peripheral conductor portions arranged with a gap therebetween in the direction in which the central axis extends. The flow path may be formed between one of the outer peripheral conductor portions and the insulator. The medium discharging means may include a gap formed between the inner peripheral surface of one of the outer peripheral conductor portions facing the flow path and the outer peripheral surface of the insulator. The gap is formed so as to be connected to the flow path and to be connected to the outside of the crushing device electrode at an end of one of the outer peripheral conductor portions facing the flow path in the direction along the central axis. May be.

In this case, the present invention can be easily applied to the crushing device electrode in which the outer peripheral conductor is composed of a plurality of outer peripheral conductor portions, and a plurality of gaps are formed at the tips thereof.

Further, the gap between the outer peripheral conductor portions is a region where discharge is generated. The end of one of the outer peripheral conductor portions faces the gap. That is, the gap connected to the flow path is connected to the outside of the crushing device electrode in the region facing the gap. The medium is supplied from the flow path through this gap to the region where the gap of the crusher electrode is located. Therefore,
It is possible to reliably supply a medium such as water to the region where the discharge occurs.

In the crushing device electrode according to the above aspect 1, the gap is surrounded by the groove formed on the outer peripheral surface of the insulator and one inner peripheral surface of the outer peripheral conductor portion facing the groove. It may be a closed space.

In this case, the gap can be formed by a relatively simple process of forming a groove on the outer peripheral surface of the insulator.

By changing the depth and width of the groove, the cross-sectional area of the gap can be easily changed. Therefore, the flow rate of the medium supplied to the discharge part of the crushing device electrode through the gap,
It can be easily adjusted by changing the cross-sectional area of this gap.

In the crushing device electrode according to the above aspect 1, the medium supplying means may be arranged in a region located on the opposite side of the tip end portion of the crushing device electrode from the medium discharging means.

In this case, since the medium supplying means can be arranged on the base side of the crushing device electrode (the region located on the side opposite to the tip part), the position apart from the tip part of the crushing device electrode (ie the discharge generating part). The medium supply means will be arranged in the. Therefore, when inserting the electrode for the crushing device into the pilot hole formed in the crushing object, if the length of the electrode for the crushing device is sufficiently long with respect to the depth of the pilot hole, move the medium supply means to the outside of the pilot hole. It will be possible to position it. As a result, it is possible to reduce the risk that the medium supply unit is directly damaged by the pressure wave used for crushing (pressure wave generated by electric discharge).

In the crushing device electrode according to the above aspect 1, the medium supply means may include a supply hole reaching from the outer peripheral surface of the outer peripheral conductor to the inner peripheral surface of the outer peripheral conductor facing the flow path. Good. Further, in the crushing device electrode according to the above aspect 1, the medium supply means may include a medium supply pipe connected to the supply hole.

The crushing device electrode according to the above aspect 1 is:
You may equip the front-end | tip part side of the crushing apparatus electrode seeing from a medium supply means, and may be equipped with the protection member for protecting a medium supply means.

In this case, a medium such as water is jetted from the tip side of the crushing device electrode (the side where the discharge is generated) to the base side of the crushing device electrode (the region side where the medium supply means is located). However, the protection member can reduce the risk that the ejected medium directly reaches the medium supply means. for that reason,
The risk that the medium supply unit is damaged by the ejected medium can be reduced.

The crushing device electrode according to the above aspect 1 may be provided with a medium outflow prevention member arranged on the outer peripheral surface of the outer peripheral conductor. The medium outflow prevention member may include a wall portion that surrounds the outer peripheral conductor and extends from the outer peripheral surface of the outer peripheral conductor toward the outside of the crushing device electrode.

Here, consider a case where the lower hole formed in the crushing object for inserting the crushing device electrode is formed in an upward, obliquely upward, or lateral direction. In this case, when the electrode for the crushing device is directly inserted into the pilot hole and a medium such as water is supplied to the inside of the pilot hole through the flow path of the electrode for the crushing device, water flows out from the pilot hole and The interior cannot be filled with water. However, if the wall portion of the medium outflow prevention member is configured so that the length is such that it can come into contact with the side wall of the downhole when the electrode for the crushing device is inserted into the downhole, the medium outflow prevention member allows the downhole to be formed. It is possible to suppress the outflow of the medium from the inside of the. For this reason, even when using a downward hole such as the upward direction as described above, a medium such as water can be reliably supplied to the tip end portion (discharge generating portion) of the crushing device electrode.

An electrode for a crushing device according to another aspect of the present invention is an electrode for a crushing device for generating an electric discharge in a medium, and one electrode and the other electrode facing each other via an insulator, and a medium supply member. With. The medium supply member is arranged on the outer peripheral surface of at least one of the one electrode and the other electrode, and supplies the medium onto the outer peripheral surface.

In this way, the medium such as water can be reliably supplied from the medium supply member to the tip portion (discharge generation portion) of the crushing device electrode via the outer peripheral surface of the one electrode or the other electrode. Further, since the above-mentioned crushing device electrode can be realized by a simple method of disposing the medium supply member on the outer peripheral surface of one electrode or the other electrode of the crushing device electrode, it is possible to increase the manufacturing cost of the crushing device electrode. Can be suppressed. The method using the medium supply member as described above is particularly effective when the crushing device electrode is small and it is difficult to form a flow path or the like therein.

In the crushing device electrode according to another aspect described above, the one electrode may be a central conductor extending along the central axis and having an outer peripheral surface, and the insulator may be the central conductor. It may be arranged on the outer peripheral surface, and the other electrode may be a peripheral conductor arranged so as to surround the central conductor via an insulator. In the crushing device electrode according to the other aspect described above, the medium supply member may be arranged on the outer peripheral surface of the outer peripheral conductor.

A crushing device according to another aspect of the present invention is
An electrode for a crushing device according to the above aspect 1 or another aspect is provided.

By doing so, it is possible to obtain a crushing device which can efficiently perform the crushing work.

[0032]

BEST MODE FOR CARRYING OUT THE INVENTION The inventor of the present invention relates to a method of supplying an electrolytic solution such as water to an electrode of a crushing apparatus using electric discharge.
As a result of the following studies, the present invention has been completed. That is, in the case of crushing an object to be crushed such as rock using the so-called electric discharge crushing method, as a method of supplying water to the electrodes of the crushing device, for example, the methods shown in FIGS. 15 and 16 can be considered. 15 and 16 are schematic views showing reference examples of the crushing method examined by the inventor in the process of completing the present invention. A crushing method as a reference example of the present invention will be briefly described with reference to FIGS. 15 and 16.

First, as shown in FIG.
02, a prepared hole 110 for inserting the electrode 101 is formed. Water 111 as an electrolytic solution is provided inside the pilot hole 110 with the electrode 101 inserted into the pilot hole 110 or before the electrode 101 is inserted into the pilot hole 110.
Need to supply.

The electrode 101 is connected to a pulse power source (not shown) via a coaxial cable 112, and the connector portion 1 connected to the coaxial cable 112.
26 and the electrode 101 which is a coaxial electrode composed of the center electrode 103, the insulator 104 and the outer peripheral electrode 106 extending from the connector portion 126. The center electrode 103 extends from the connector portion 126 in the direction along the center axis of the electrode 101. The insulator 104 is arranged so as to surround the outer periphery of the center electrode 103. The outer electrode 106 is an insulator 104
Are arranged so as to surround the outer periphery of the. Peripheral electrode 106
Are outer peripheral electrode portions 105a to 105d arranged with a gap therebetween in the direction along the central axis of the electrode 101.
Consists of.

As shown in FIG. 15, one of the methods for supplying the water 111 into the lower hole 110 is the hose 140.
It is conceivable that a method of discharging water toward the entrance of the pilot hole 110 as shown by an arrow 141. However, in the method using the hose 140, in order to supply the water 111 to the inside of the pilot hole 110, the water is supplied through the narrow gap between the side wall surface of the pilot hole 110 and the outer peripheral side surface of the electrode 101. It is necessary to supply water to the inside of the hole 110. for that reason,
As shown in FIG. 15, when water is discharged toward the lower hole 110 by the hose 140 from a separated position, the hose 140
Most of the water discharged from the water flows not to the inside of the lower hole 110 but to the surface of the crushing target 102 around the lower hole 110. Further, since it is necessary for the operator to operate the hose 140 each time to aim at the lower hole 110 and discharge the water, this is a factor that reduces the work efficiency of the crushing work.

As another method for supplying the water 111 into the lower hole 110, the method shown in FIG. 16 can be considered. That is, as shown in FIG.
In order to supply water 111 to the inside of the pipe, a pipe 142 is connected to the end of the hose 140, and the pipe 142 is connected to the pilot hole 11
It is inserted into the prepared hole 110 through the gap between the side wall surface of 0 and the outer peripheral side surface of the electrode 101. In this state, hose 14
Water from 0 to the inside of the pilot hole 110 through the pipe 142
11 can be supplied.

However, in the method shown in FIG.
Even when a pipe made of a material having high strength such as an iron pipe is used as the pipe 142, an electric discharge is generated in the gap between the tip portion of the electrode 101 and the outer peripheral electrode portions 105a to 105d to crush the object 102 to be crushed. When the water is crushed, there is a problem that the pipe 142 is damaged by the force of the water 111 ejected from the gap between the outer peripheral side surface of the electrode 101 and the side wall surface of the lower hole 110. The water ejected from the inside of the pilot hole 110 at the time of electric discharge crushing is ejected with an extremely high pressure such that the iron plate having a thickness of 10 mm is easily bent.

In order to prevent such damage of the pipe 142, the pipe 142 is arranged above the electrode 101 (a region near the connector 126), and the insertion depth for inserting the electrode 101 into the lower hole 110 is increased. Depending on the size, the tip of the pipe 142 may not be inserted into the prepared hole 110. In such a case, it is difficult to efficiently supply the water 111 into the prepared hole 110 as shown in FIG.

The inventor believes that there is a limit to the method of supplying the water 111 into the prepared hole 110 by using the pipe 142 or the like which is a member different from the electrode 101 as described above, and as shown below, It was considered to incorporate a mechanism for supplying water 111 to 101 itself. Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts will be denoted by the same reference numerals and the description thereof will not be repeated.

(Embodiment 1) FIG. 1 is a schematic diagram for explaining Embodiment 1 of an electrode and a crushing device using the electrode according to the present invention. FIG. 2 is a schematic diagram showing a tip portion of the electrode shown in FIG. FIG. 3 is a schematic sectional view of the tip portion of the electrode shown in FIG. FIG. 4 shows the line segment I of FIG.
It is a cross-sectional schematic diagram in V-IV. 1 to 4, a first embodiment of an electrode and a crushing device according to the present invention
Will be explained.

As shown in FIG. 1, the crushing apparatus according to the present invention includes an electrode 1 as a crushing apparatus electrode and a pulse power source 13.
And a power supply 16. The pulse power source 13 is composed of a circuit including a capacitor 15 and a switch 14. A power source 16 is connected to the pulse power source 13. Although not shown, the circuit of the pulse power source 13 is grounded. The pulse power source 13 and the electrode 1 are coaxial cables 12
And the connector portion 26. Figure 1
As shown in FIG. 3, the electrode 1 is a so-called coaxial electrode, and the center electrode 3 as one electrode extends along the center axis.
An insulator 4 arranged so as to surround the outer periphery of the center electrode 3, and an outer peripheral electrode 6 (see FIG. 1) as the other electrode disposed on the outer periphery of the insulator. The outer peripheral electrode 6 as the outer peripheral conductor is composed of outer peripheral electrode portions 5a to 5d (see FIG. 1) as the outer peripheral conductor portions which are arranged with a gap therebetween in the direction along the central axis.

Between the outer peripheral electrode portion 5d and the insulator 4,
As shown in FIG. 4, the outer diameter of the insulator 4 is reduced to form an electrolyte flow passage 20 as a flow passage between the surface (outer peripheral surface) of the insulator 4 and the inner peripheral surface of the outer peripheral electrode portion 5d. Has been done. An electrolytic solution introducing portion 7 having an introducing portion hole 19 (see FIG. 3) as a supply hole is arranged above the outer peripheral electrode portion 5d so as to be connected to the electrolytic solution flow passage 20. A hose 8 (see FIG. 3) is provided in the electrolytic solution introducing portion 7 as a medium supplying means.
(See) is connected. The hose 8 connects the electrolytic solution introducing portion 7 and the electrolytic solution supply device 9 (see FIG. 1). Although not shown, the electrolytic solution supply device 9 includes a tank for accumulating the electrolytic solution, a pump for supplying the electrolytic solution from the tank of the electrolytic solution supply device 9 to the electrode 1 through the hose 8, and these devices. It includes a control device for controlling. Note that the medium supply unit is not limited to the configuration such as the electrolytic solution introducing unit 7 in which the introducing unit hole 19 described above is formed, and another structure may be used.

An electrolytic solution supply hole 17 connected to the electrolytic solution flow passage 20 is formed in the lower portion of the outer peripheral electrode portion 5d (a region near the tip of the electrode 1). The electrolytic solution supply hole 17 as a medium discharging means is formed so as to extend in the radial direction with respect to the central axis over the entire circumference of the outer peripheral electrode portion 5d. Water as an electrolytic solution delivered from the electrolytic solution supply device 9 (see FIG. 1) is guided to the electrolytic solution flow passage 20 of the electrode 1 through the hose 8 and the introduction hole 19 of the electrolytic solution introduction part 7. Then, it is supplied from the electrolytic solution flow passage 20 through the electrolytic solution supply hole 17 as a discharge hole to the inside of the lower hole 10 in which the tip portion of the electrode 1 (a region where discharge occurs) is located.

Next, a crushing method using the crushing device shown in FIGS. 1 to 4 will be briefly described. When crushing rocks,
The electrode 1 is inserted into a prepared hole 10 (see FIG. 1) formed in a crushing object 2 (see FIG. 1) such as rock. In this state, water as a medium is supplied from the electrolytic solution supply device 9 via the hose 8 and the electrolytic solution introducing portion 7 to the electrolytic solution flow passage 20 of the electrode 1.
(See FIG. 3). Then, water is supplied from the inside of the electrolyte flow passage 20 into the inside of the pilot hole 10 through the electrolyte supply hole 17. As a result, as shown in FIG. 1, the inside of the pilot hole 10 can be filled with water 11. Although water is used as an example of the electrolytic solution in the description, any other liquid may be used as long as it is an electrolytic solution. Moreover, even if it is a medium other than the electrolytic solution, a medium other than the electrolytic solution may be used as long as it is a medium that can generate a discharge in the gap 18 of the electrode 1 (see FIG. 2). Is not limited to liquid, and any material such as powder, granules, and gas may be used.

The pulse power source 13 (see FIG. 1)
Power supply 16 (see FIG. 1) to the capacitor 15 (see FIG. 1) of
By connecting with, electric charge is accumulated in the capacitor 15. When crushing, the switch 14 (see FIG. 1) of the pulse power source 13 is closed. At this time, capacitor 1
The electric charge stored in 5 is introduced into the electrode 1. Then, at the tip of the electrode 1, the center electrode 3 as a center conductor is formed.
A discharge is generated in the gap 18 (see FIG. 2) between the tip of the and the outer peripheral electrode portion 5a to form an arc.
Similarly, in the gap 18 (see FIG. 2) between the outer peripheral electrode portions 5a to 5d, discharge is generated and an arc is formed. As a result, the water 11 near the tip of the electrode 1 is turned into plasma by the discharge energy, and a pressure wave is generated. The crushing target 2 located around the electrode 1 can be crushed by this pressure wave.

As described above, in the crushing device shown in FIGS. 1 to 4, the electrolytic solution flow passage 20 is formed inside the electrode 1 and a region where the discharge of the electrode 1 is generated through the electrolytic solution flow passage 20. It is possible to reliably supply a medium such as water to the vicinity of. Therefore, it is possible to efficiently perform the work of supplying the medium such as water in the crushing work.

Further, since the electrolytic solution flow passage 20 for the medium can be easily formed by forming a gap between the outer peripheral electrode portion 5d and the insulator 4, it is possible to suppress an increase in the manufacturing cost of the electrode 1. it can.

As a method of forming the electrolytic solution flow passage 20, a groove is formed on the inner peripheral surface of the outer peripheral electrode portion 5d, or the inner diameter of the outer peripheral electrode portion 5d is larger than the outer diameter of the insulator 4. It is also possible to use a technique such as forming a portion that is not formed, forming a groove on the outer peripheral surface of the insulator 4, or forming a portion of the insulator 4 having an outer diameter smaller than the inner diameter of the outer peripheral electrode portion 5d. .

Further, the electrolytic solution supply hole 1 is provided in the outer peripheral electrode portion 5d.
Forming 7 is a relatively simple processing step, and also in this respect, an increase in the manufacturing cost of the electrode 1 can be suppressed.

In the crushing device shown in FIGS. 1 to 4,
When crushing, the direction in which water flows out from the lower hole 10 (see FIG. 1) is different from the direction in which the electrolytic solution supply hole 17 for supplying water into the lower hole 10 extends. Therefore, when water spouts from the inside of the lower hole 10 due to discharge, the internal structure of the electrolyte solution supply hole 17 and the portion where the electrolyte solution supply hole 17 is formed are damaged by the pressure of the spouted water and the like. The risk can be reduced.

Further, the external shape of the tip of the electrode 1 is such that the outer peripheral electrode portion 5d has a lateral hole, that is, an electrolytic solution supply hole 17
Basically, it is the same as the tip portion of the conventional coaxial electrode except that is formed. Therefore, the crushing target 2 (see FIG. 1)
When the electrode 1 (see FIG. 1) is inserted into the prepared hole 10 (see FIG. 1), the same operability as that of the conventional coaxial electrode can be ensured.

The electrolyte flow passage 20 is a gap between the inner wall of the outer peripheral electrode portion 5d and the outer wall of the insulator 4. Since the outer peripheral electrode 6 acts as a negative electrode (is a low-voltage conductor), when a current is applied to the electrode 1 for crushing,
It is possible to reduce the risk that this current leaks (leaks) to the outside of the electrode 1 via the electrolytic solution such as water supplied to the electrolytic solution flow passage 20.

Further, the electrolytic solution introducing portion 7 is formed in the upper part of the electrode 1 (the area located on the side opposite to the tip of the electrode 1 when viewed from the electrolytic solution supply hole 17 and near the connector portion 26). Has been done. Therefore, the electrolytic solution introducing portion 7 is located outside the pilot hole 10. When water 11 is jetted from the inside of the lower hole 10 (see FIG. 1) when crushing, the momentum of the water jetted from the lower hole 10 and reaching the electrolytic solution introducing portion 7 is weakened to some extent. For this reason, the electrolytic solution introducing portion 7 is formed by the water ejected from the lower hole 10 in accordance with the electric discharge.
Can be less likely to be damaged.

Even if a crack is formed on the wall surface of the pilot hole 10 (see FIG. 1) and water 11 (see FIG. 1) leaks to the outside of the pilot hole 10, the electrode 1 (see FIG. reference)
If water is continuously supplied to the inside of the pilot hole 10 from the electrolytic solution supply hole 17 (see FIG. 1), the inside of the pilot hole 10 can be filled with water 11. In addition, consider a case where not the downward pilot hole 10 as shown in FIG. 1 but the horizontal or upward pilot hole 10 is formed and the electrode 1 is inserted thereinto for crushing. In this case, electrode 1
If the distance between the outer peripheral side surface of the base plate and the side wall surface of the base hole 10 is made sufficiently small, by continuously supplying water from the electrolyte solution supply hole 17, the base hole 1 other than such a downward surface can be obtained.
Even if 0 is used, water can be retained in the prepared hole 10 to some extent.

As the outer peripheral electrode portion 5d of the electrode 1, for example, a cylindrical iron pipe having an inner diameter of 40 mm and a thickness of 5 mm can be used. Further, as the center electrode 3, a metal rod such as iron, copper, or silver having a diameter of 20 mm can be used. Then, as shown in FIG. 3, the outer diameter of the insulator 4 is set to 34 mm in the portion where the electrolytic solution passage 20 is formed. The outer diameter of the insulator 4 is 40 mm in the region where the electrolyte flow passage 20 is not formed. As a result, the outer diameter of the insulator 4 is 34
In the area of mm, a height of 3 mm is provided between the inner peripheral wall surface of the outer peripheral electrode portion 5d and the outer peripheral wall surface of the insulator 4. This gap serves as the electrolyte flow passage 20.

Further, the electrolytic solution supply hole 17 formed in the outer peripheral electrode portion 5d is preferably formed so as to extend in a direction substantially perpendicular to the extending direction of the electrode 1 as shown in FIG. Further, the extending direction of the electrolyte flow passage 20 may be inclined to the direction intersecting the central axis of the electrode 1. Also,
If the diameter of the electrolyte solution supply hole 17 is made sufficiently small, it is possible to suppress the water jetted from the inside of the lower hole 10 at the time of crushing from flowing into the electrolyte solution supply hole 17.

FIG. 5 is a schematic diagram showing a modification of the first embodiment of the crushing apparatus according to the present invention. A modification of the first embodiment of the crushing apparatus according to the present invention will be described with reference to FIG.

As shown in FIG. 5, the crushing device basically has the same structure as the crushing device shown in FIGS.
A protective plate 21 as a protective member is formed below the electrolytic solution introducing portion 7 in the electrode 1. The protective plate 21 is provided in order to prevent the water 11 ejected from the inside of the pilot hole 10 from directly reaching the electrolytic solution introducing portion 7 when crushing.

By doing so, the same effect as that of the crushing device shown in FIGS. 1 to 4 can be obtained, and it is possible to more reliably prevent the electrolytic solution introducing portion 7 from being damaged by the crushing.

(Embodiment 2) FIG. 6 is a schematic view of a tip portion of an electrode constituting Embodiment 2 of a crushing apparatus according to the present invention. FIG. 7 is a schematic sectional view of the electrode shown in FIG. FIG. 8 is a schematic sectional view taken along the line segment VIII-VIII in FIG. 7. Embodiment 2 of the crushing apparatus according to the present invention will be described with reference to FIGS. 6 to 8.

The second embodiment of the crushing apparatus according to the present invention is
Basically, the structure is similar to that of the crushing device shown in FIGS. 1 to 4, but the structure of the electrode 1 is different. That is, in the outer peripheral electrode portion 5d of the electrode 1, the electrolytic solution supply hole 17 is not formed unlike the electrodes shown in FIGS. 6-
In the electrode 1 shown in FIG. 8, instead of the electrolyte solution supply hole 17 (see FIG. 1), a face drop portion 22 (FIG. 8) is formed. The lower end of the chamfered portion 22 (see FIG. 7) is located below the lower end of the outer peripheral electrode portion 5d (see FIG. 7). That is, the chamfered portion 22 and the outer peripheral electrode portion 5d
The discharge flow path 23, which is a region surrounded by the inner peripheral surface of the electrolytic solution, is connected to the electrolytic solution flow path 20, and
It is formed so as to be connected to the outside of the electrode 1 at the end portion in the direction along the central axis of the outer peripheral electrode portion 5d facing the. Then, in a region adjacent to the region where the chamfered portion 22 is formed in the circumferential direction of the insulator 4, the outer peripheral surface of the insulator 4 and the inner peripheral face of the outer peripheral electrode portion 5d are in contact and fixed.

In this way, the hose 8 (see FIG. 6)
Water supplied into the inside of the electrolyte flow passage 20 (see FIG. 7) through the electrolyte introducing portion 7 (see FIG. 6) is the chamfered portion 22 (see FIG. 7) of the insulator 4 (see FIG. 7). (See FIG. 7) and the inner peripheral surface of the outer peripheral electrode portion 5d (see FIG. 7) via the discharge flow path 23 (see FIG. 7) as a gap.
(See FIG. 7) It is discharged to the tip side. As a result,
~ The same effect as the electrode shown in FIG. 4 can be obtained.
The cross section along the line IV-IV in FIG. 7 is basically the same as the cross section shown in FIG.

Further, in the crushing device shown in FIGS. 6 to 8,
The gap between the outer peripheral electrode portions 5c and 5d is a region where discharge is generated. The lower end of the outer peripheral electrode portion 5d faces the gap. That is, since the discharge flow path 23 as a gap connected to the electrolyte flow passage 20 is connected to the outside of the electrode 1 in the region facing the gap, water or the like is directly supplied to the gap where the discharge occurs. The electrolytic solution can be supplied. Further, since the discharge flow path 23 can be easily formed by partially cutting off the outer peripheral surface of the insulator 4, an increase in the manufacturing cost of the electrode 1 can be suppressed.

FIG. 9 is a schematic cross-sectional view of an electrode used in a crushing device for explaining a modification of the crushing device according to the second embodiment of the present invention shown in FIGS. 6 to 8. A modification of the crushing device according to the second embodiment of the present invention will be described with reference to FIG. Note that FIG. 9 corresponds to FIG. 8.

The electrode 1 shown in FIG. 9 has basically the same structure as the electrode shown in FIGS. 6 to 8, but for discharging water connected to the electrolyte flow passage 20 (see FIG. 7). The shape of the discharge flow path 23 is different. That is, in the electrode shown in FIG. 9, in the insulator 4, the groove 24 for forming the discharge flow path 23 is formed so as to be connected to the lower end of the electrolytic solution flow passage 20. The grooves 24 are provided at four locations on the circumference of the insulator 4 when viewed from the central axis direction of the electrode 1 as shown in FIG.
They are arranged at equal intervals in the circumferential direction.
The crushing device using such an electrode can also obtain the same effect as the crushing device shown in FIGS.
Further, the discharge channel 23 can be formed by a relatively simple process of forming the groove 24 on the outer peripheral surface of the insulator 4.

Further, in the crushing device shown in FIGS. 6 to 9,
By changing the width and depth of the chamfer 22 (see FIG. 8) and the groove 24 (see FIG. 9), the cross-sectional area of the discharge flow path 23 can be easily changed. Therefore, the electrode 1
The flow rate of a medium such as water supplied to the discharge part (gap) can be easily adjusted by changing the cross-sectional area of the discharge flow path 23. The cross-sectional shape of the groove 24 may be semicircular as shown in FIG. 9, but may also be quadrangular or other polygonal shape. Further, the number of the grooves 24 is not limited to four as shown in FIG. 9, and may be one to three, or five or more. The lower end of the groove 24 has the outer peripheral electrode portion 5d (see FIG. 6) similarly to the chamfered portion 22 (see FIG. 5) shown in FIGS.
It is formed so as to extend to the lower side (the tip end side of the electrode 1) of the lower end of the reference point).

Further, in the crushing device shown in FIGS. 6 to 9,
At the lower end of the outer peripheral electrode portion 5d (the end portion of the outer peripheral electrode portion 5d located on the tip end side of the electrode 1), the outer peripheral surface of the insulator 4 and the inner peripheral surface of the outer peripheral electrode portion 5d are fixed in contact with each other.
It is possible to suppress the occurrence of the problem that the outer peripheral electrode portion 5a rattles the insulator 4. Further, since it is not necessary to perform the process of forming the electrolytic solution supply hole 17 (see FIG. 1) in the outer peripheral electrode portion 5d, the manufacturing process of the electrode 1 can be simplified. As a result, an increase in the manufacturing cost of the electrode 1 can be suppressed.

Further, in the upper part of the outer peripheral electrode portion 5d (the region near the connector portion 26 of the electrode 1 (see FIG. 1)),
The outer peripheral surface of the insulator 4 and the inner peripheral surface of the outer peripheral electrode portion 5d are in contact with each other in a region located above the electrolytic solution introducing portion 7.
By doing so, the outer peripheral electrode portion 5d can be removed from the insulator 4.
The rattling can be suppressed more effectively. Further, in this portion, the insulator 4 and the outer peripheral electrode portion 5d are brought into close contact with each other and fixed, so that water spouted by the discharge is passed through the electrolyte flow passage 20 and the connector portion 26 (see FIG. 1).
It is possible to suppress the occurrence of problems such as inflow to.

(Embodiment 3) FIG. 10 is a schematic view of electrodes constituting Embodiment 3 of the crushing apparatus according to the present invention. FIG. 11 is a schematic diagram for explaining a crushing method using the crushing device including the electrode shown in FIG. Figure 10
Embodiment 3 of the crushing apparatus according to the present invention will be described with reference to FIG.

The third embodiment of the crushing apparatus according to the present invention is
Basically, it has the same structure as the crushing device shown in FIGS. 1 to 4, but the structure of the electrode 1 is different. That is, as shown in FIG. 10, in the electrode 1, the seal member 25 is arranged closer to the electrolytic solution introducing portion 7 than the electrolytic solution supply hole 17. The seal member 25 as a medium outflow prevention member is shown in FIG.
As shown in FIG. 1, it plays a role of packing for preventing water 11 from flowing out from the inside of the pilot hole 10. The sealing member 25 includes a wall portion that surrounds the outer peripheral electrode portion 5d and extends from the outer peripheral surface of the outer peripheral electrode portion 5d toward the outside of the electrode 1. The outer circumference of this wall is
As shown in FIG. 11, the length is set so that it can contact the side wall surface of the pilot hole 10.

Even in this case, the same effect as that of the first embodiment of the crushing apparatus according to the present invention can be obtained. Further, as shown in FIG. 11, even when crushing is performed using the pilot hole 10 extending obliquely upward or horizontally, the presence of the seal member 25 causes the electrode 1 to be inserted below. Water 11 can accumulate inside the holes 10. As a result, when crushing, it is possible to reliably generate a pressure wave with the generation of plasma inside the pilot hole 10.

As shown in FIG. 11, when the pilot hole 10 formed obliquely upward is used, the pilot hole 10
A space 27 in which air is collected is formed at the bottom portion (upper end portion). However, experiments have shown that if the size of the space 27 is sufficiently small, it does not particularly affect the crushing force.

(Embodiment 4) FIG. 12 is a schematic view of electrodes constituting Embodiment 4 of the crushing apparatus according to the present invention. FIG. 13 is a schematic sectional view of the electrode shown in FIG. FIG. 14 is a schematic diagram for explaining a crushing method using the crushing device including the electrodes shown in FIGS. 12 and 13. Embodiment 4 of the crushing apparatus by this invention is demonstrated with reference to FIGS.

The fourth embodiment of the crushing apparatus according to the present invention is
Basically, the structure is similar to that of the crushing device shown in FIGS. 1 to 4, but the structure of the electrode 1 is different as shown in FIGS. 12 to 14. That is, the electrode 1 of the crushing device shown in FIGS. 12 to 14 is basically an electrode having a coaxial structure, and like the electrode of the crushing device shown in FIG. The insulator 4 is provided on the outer peripheral surface, and the outer peripheral electrode 6 including the outer peripheral electrode portions 5a to 5d is provided on the outer peripheral surface of the insulator 4. However, as can be seen from FIG. 13, no gap is formed between the insulator 4 and the outer peripheral electrode portion 5d. An electrolytic solution supply member 28 as a medium supply member is installed in the upper region on the outer peripheral surface of the outer peripheral electrode portion 5d. Electrolyte supply member 28
The hose 8 is connected to the electrolytic solution introducing portion 29 of.
The hose 8 is connected to an electrolytic solution supply device 9 (see FIG. 1).

The electrolytic solution supply member 28 has a cylindrical outer shape and is arranged so as to surround the outer peripheral surface of the outer peripheral electrode portion 5d. The upper portion of the electrolytic solution supply member 28 is in contact with the outer peripheral wall surface of the outer peripheral electrode portion 5d. The inner wall surface of the electrolytic solution supply member 28 from the central portion to the lower portion is arranged with a gap from the outer peripheral surface of the outer peripheral electrode portion 5d.
As a result, the surface of the outer peripheral electrode portion 5d and the electrolytic solution supply member 2
A gap 30 is formed between the two. The lower surface of the electrolytic solution supply member 28 faces the surface of the outer peripheral electrode portion 5d with a distance smaller than the distance from the surface of the outer peripheral electrode portion 5d in the gap 30 to the inner peripheral surface of the electrolytic solution supply member 28. Lower end portion 33 of the electrolytic solution supply member arranged to
Are arranged. An outflow passage 31 for discharging water is formed between the lower end portion 33 of the electrolytic solution supply member and the surface of the outer peripheral electrode portion 5d.

In this way, the water supplied to the gap 30 via the hose 8 and the electrolytic solution introducing portion 29 temporarily stays in the gap 30 and then flows through the outflow passage 31 into the surface 32 of the outer peripheral electrode portion 5d. Outflow to. As a result, FIG.
As shown in FIG. 3, in the state where the electrode 1 is arranged inside the prepared hole 10 formed in the crushing target 2, the electrolytic solution is supplied from the electrolytic solution supply device (not shown) through the hose 8 and the electrolytic solution introducing portion 29. The water supplied to the supply member 28 flows from the outflow passage 31 onto the surface of the outer peripheral electrode portion 5d and flows into the prepared hole 10. As a result, the water 11 can be efficiently supplied to the inside of the pilot hole 10.

The structure of the electrode 1 shown in FIGS. 12 to 14 is as follows.
For example, the outer peripheral electrode portion 5d (see FIG. 13) and the insulator 4
(See FIG. 13) A gap (electrolyte flow passage 20 (see FIG.
(See)) is effective for an electrode having a device configuration in which there is no room to provide. The electrolytic solution supply member 28 (see FIG. 12) may be fixed to the outer peripheral electrode portion 5d, or the outer peripheral electrode portion 5d.
You may make it move freely on d in the direction parallel to the extending direction of the electrode 1. As such an electrolyte solution supply member 28, for example, a T-shaped joint or the like is used, and the upper side of the electrode 1 (connector portion 26 (see FIG. 14) side).
The gap between the T-shaped joint and the surface of the outer peripheral electrode portion 5d is made small so that water supplied to the joint via the hose 8 mainly flows to the tip end side of the electrode 1. May be. Since such an electrode can be obtained by a simple process such as adding the electrolytic solution supply member 28 to the conventional electrode, the manufacturing cost of the electrode can be reduced. Further, such a configuration is suitable when the pressure of water sprayed from the inside of the pilot hole 10 (see FIG. 14) due to the crushing is small.

The embodiments disclosed this time are to be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above-described embodiments but by the scope of the claims, and is intended to include meanings equivalent to the scope of the claims and all modifications within the scope.

[0079]

As described above, according to the present invention, a channel for circulating a medium such as water is formed inside the electrode for the crushing device, and a means for discharging the medium from this channel is provided as the electrode for the crushing device. Therefore, during the crushing work, a medium such as water can be reliably supplied into the prepared hole into which the electrode for the crushing device is inserted.

[Brief description of drawings]

FIG. 1 is a schematic diagram for explaining Embodiment 1 of an electrode and a crushing device using the electrode according to the present invention.

FIG. 2 is a schematic diagram showing a tip portion of the electrode shown in FIG.

3 is a schematic cross-sectional view of a tip portion of the electrode shown in FIG.

FIG. 4 is a schematic sectional view taken along the line IV-IV in FIG.

FIG. 5 is a schematic diagram showing a modification of the first embodiment of the crushing device according to the present invention.

FIG. 6 is a schematic diagram of a tip portion of an electrode that constitutes Embodiment 2 of the crushing device according to the present invention.

7 is a schematic sectional view of the electrode shown in FIG.

8 is a schematic sectional view taken along the line segment VIII-VIII in FIG.

FIG. 9 is a schematic cross-sectional view of an electrode used in the crushing device for explaining a modification of the crushing device according to the second embodiment of the present invention shown in FIGS. 6 to 8.

FIG. 10 is a schematic diagram of electrodes constituting a crushing device according to a third embodiment of the present invention.

FIG. 11 is a schematic diagram for explaining a crushing method using the crushing device including the electrode shown in FIG.

FIG. 12 is a schematic view of electrodes constituting a crushing device according to a fourth embodiment of the present invention.

13 is a schematic sectional view of the electrode shown in FIG.

FIG. 14 is a schematic diagram for explaining a crushing method using the crushing device including the electrodes shown in FIGS. 12 and 13.

FIG. 15 is a schematic diagram showing a reference example of a crushing method examined by the inventor in the process of completing the present invention.

FIG. 16 is a schematic diagram showing a reference example of a crushing method examined by the inventor in the process of completing the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 electrode, 2 crushing target object, 3 center electrode, 4 insulator, 5a-5d outer peripheral electrode part, 6 outer peripheral electrode, 7 electrolytic solution introducing part, 8 hose, 9 electrolytic solution supply device, 10
Pilot hole, 11 water, 12 coaxial cable, 13 pulse power source, 14 switch, 15 capacitor, 16 power supply, 17 electrolyte supply hole, 18 gap, 19 introduction hole, 20 electrolyte flow passage, 21 protective plate, 22 faces Drop portion, 23 discharge flow path, 24 groove, 25 sealing member,
26 connector part, 27 space, 28 electrolytic solution supply member, 29 electrolytic solution introducing part, 30 gap, 31 outflow passage,
32 surface, 33 lower end.

Continued front page    (72) Inventor Toru Okazaki             1-3-3 Shimaya, Konohana-ku, Osaka Sumitomo Electric             Ki Industry Co., Ltd. Osaka Works (72) Inventor Ryosuke Hata             1-3-3 Shimaya, Konohana-ku, Osaka Sumitomo Electric             Ki Industry Co., Ltd. Osaka Works (72) Inventor Kazuyoshi Kaseda             1-3-3 Shimaya, Konohana-ku, Osaka Sumitomo Electric             Ki Industry Co., Ltd. Osaka Works F-term (reference) 2D065 EA26                 4D067 CG06 GA02

Claims (10)

[Claims] 1. An electrode for a crushing device, which includes a first electrode and a second electrode that generate a discharge in a medium and face each other via an insulator, wherein at least one of the one electrode and the other electrode and the insulator And a medium supply unit that supplies the medium to the flow channel, and a medium discharge unit that discharges the medium from the flow channel to the outside of the crushing device electrode. An electrode for a crushing device, comprising: 2. The one electrode is a central conductor extending along a central axis and having an outer peripheral surface, the insulator is disposed on the outer peripheral surface of the central conductor, and the other electrode is The outer peripheral conductor arranged so as to surround the central conductor via the insulator, wherein the flow path is formed between the outer peripheral conductor and the insulator. Electrodes for crushing equipment. 3. The crushing device according to claim 2, wherein the medium discharging means includes a discharge hole reaching from an outer peripheral surface of the outer peripheral conductor to an inner peripheral surface of the outer peripheral conductor facing the flow path. Electrodes. 4. The outer peripheral conductor includes outer peripheral conductor portions that are spaced apart from each other in a direction in which the central axis extends, and the flow path includes one of the outer peripheral conductor portions and the insulating layer. The medium discharging means includes a gap formed between an inner peripheral surface of one of the outer peripheral conductor portions facing the flow path and an outer peripheral surface of the insulator. The gap is connected to the flow path, and at the end of one of the outer peripheral conductor portions facing the flow path in the direction along the central axis, outside the crushing device electrode. The crushing device electrode according to claim 2, which is formed so as to be connected to the electrode. 5. The space is a space surrounded by a groove formed on an outer peripheral surface of the insulator and an inner peripheral surface of one of the outer peripheral conductor portions facing the groove. Item 4
An electrode for a crushing device according to. 6. Arranged on an outer peripheral surface of the outer peripheral conductor,
6. A medium outflow prevention member including a wall portion that surrounds the outer peripheral conductor and extends from the outer peripheral surface of the outer peripheral conductor toward the outside of the crushing device electrode. An electrode for a crushing device according to item 1. 7. The medium supply unit according to claim 1, wherein the medium supply unit is arranged in a region located on the opposite side of the tip of the crushing device electrode when viewed from the medium discharge unit.
An electrode for a crushing device according to the item. 8. The protective member, which is arranged on the tip end side of the crushing apparatus electrode as viewed from the medium supply unit, for protecting the medium supply unit. For crushing equipment. 9. An electrode for a crushing device for generating a discharge in a medium, wherein one electrode and the other electrode are opposed to each other via an insulator, and at least one of the one electrode and the other electrode is on an outer peripheral surface. And an electrode for a crushing device, which is provided in the above and is provided with a medium supply member for supplying a medium onto the outer peripheral surface. 10. A crushing device comprising the crushing device electrode according to any one of claims 1 to 9.