CN112781456A

CN112781456A - Reusable high-pressure electromagnetic force blasting device

Info

Publication number: CN112781456A
Application number: CN202110229364.7A
Authority: CN
Inventors: 余新洛
Original assignee: Shaanxi Xintong Yutong Intelligent Technology Co ltd
Current assignee: Shaanxi Xintong Yutong Intelligent Technology Co ltd
Priority date: 2021-03-02
Filing date: 2021-03-02
Publication date: 2021-05-11

Abstract

The invention discloses a reusable high-pressure electromagnetic force blasting device, which comprises a blasting barrel, an expansion sealing barrel, a transmission barrel and a blasting rod, wherein the blasting barrel is arranged in the transmission barrel; the explosion cylinder, the expansion sealing cylinder and the transmission cylinder are sequentially arranged from inside to outside along the axial direction in the explosion hole, the explosion rod axially penetrates through the expansion sealing cylinder and the transmission cylinder, the lower end of the explosion rod extends into the explosion cylinder, the upper end of the explosion rod extends out of the explosion hole, the positive electrode and the negative electrode at one end of the lead are respectively connected with an upper tungsten needle and a lower tungsten rod which are positioned in the explosion cylinder, and the positive electrode and the negative electrode at the other end of the lead are connected to an external power supply; the invention relates to a blasting cartridge, in particular to a blasting cartridge for blasting a blast hole, an expansion sealing cartridge for radially expanding and sealing the blast hole, a transmission cartridge for providing expansion sealing torque for the expansion sealing cartridge, an external power supply for releasing high-voltage current during blasting to initiate electric arc instant gasification blasting media between an upper tungsten needle and a lower tungsten rod to initiate blasting, and the blasting cartridge can be simply, efficiently and repeatedly used.

Description

Reusable high-pressure electromagnetic force blasting device

Technical Field

The invention relates to the technical field of high-pressure electromagnetic force blasting, in particular to a reusable high-pressure electromagnetic force blasting device.

Background

The function of the blasting technology is very important in large-scale projects such as railways, highways, mines, reservoirs and the like. Blasting technology is used for digging a tunnel in a mining and road repairing manner and removing old buildings in cities. With the development of economy and the increase of engineering construction, blasting attracts more attention. As is well known, the current blasting technology uses explosives for blasting, however, the explosives have many varieties and different component effects, are difficult to control accurately, and have great potential safety hazards in transportation, storage and management, thus being very dangerous.

The high-voltage electromagnetic force blasting is a blasting mode that high-voltage discharge is instantaneously carried out in a closed space, a blasting medium is instantaneously gasified, and then explosion is generated in the closed space so as to achieve a blasting target. The high-voltage electromagnetic force blasting has the advantages of safety and reliability in transportation, storage and management, accurate control of explosion equivalent by controlling discharge, and the like. However, the instant gasification using the fuse as the medium is usually one-time blasting, the gasification of the fuse disappears after the blasting is completed, and the new blasting or the next blasting needs to be performed by re-drilling and filling the high-voltage electric porcelain blasting device, which wastes time and labor and is low in efficiency. Therefore, there is no feasible high-pressure electromagnetic force blasting device which can be reused to overcome the problem.

Disclosure of Invention

The embodiment of the invention provides a reusable high-pressure electromagnetic force blasting device, which comprises a blasting cartridge 1, an expansion sealing cartridge 2, a transmission cartridge 3 and a blasting rod 4, wherein the blasting cartridge 1 is in a thick-wall cylindrical shape, a plurality of guide holes 101 are formed in the side wall of the blasting cartridge 1 and are communicated with the inside and the outside of the blasting cartridge 1, a conductive upper tungsten needle 102 and a conductive lower tungsten rod 103 are arranged in the blasting cartridge 1, the upper tungsten needle 102 and the lower tungsten rod 103 are mutually insulated, the expansion sealing cartridge 2 is a cylinder with a flexible expansion sealing material 201 arranged on the outer layer and an expansion framework 202 arranged on the inner layer, the transmission cartridge 3 is in a long cylindrical shape, a coaxial hollow transmission rod 301 is arranged in the transmission cartridge 3, and the blasting rod 4 is a long straight circular tube with a lead 5; the explosion cylinder 1, the expansion sealing cylinder 2 and the transmission cylinder 3 are sequentially arranged from inside to outside along the axial direction in the self-explosion hole 6, the explosion rod 4 axially penetrates through the expansion sealing cylinder 2 and the transmission cylinder 3, the explosion cylinder 1, the expansion sealing cylinder 2, the transmission cylinder 3, the explosion rod 4 and the transmission rod 301 are coaxial, the lower end of the explosion rod 4 extends into the explosion cylinder 1, the upper end of the explosion cylinder extends out of the explosion hole 6, the positive electrode and the negative electrode of one end of the lead 5 are respectively connected with the upper tungsten needle 102 and the lower tungsten rod 103, and the positive electrode and the negative electrode of the other end of the lead 5 are connected to an; the blasting cartridge 1 is used for blasting a target in the blasting hole 6, the expansion sealing cartridge 2 is used for radially expanding and sealing the blasting hole 6, the transmission cartridge 3 is used for providing expansion sealing torque for the expansion sealing cartridge 2, and the external power supply 7 releases high-voltage current during blasting to initiate electric arc between the upper tungsten needle 102 and the lower tungsten rod 103 to instantaneously gasify the blasting medium 8 filled in the blasting cartridge 1 to cause blasting force to rush out from the guide hole 101 and blast the blasting hole 6; during blasting, the external power supply 7 instantly releases 5000-30000-volt high-voltage current through the high-voltage capacitor to instantly gasify and detonate the blasting medium 8 in a narrow space of the blasting cartridge 1, strong impact force forms a stronger blasting effect than that of an isometric explosive, guide holes 101 in different directions, different sizes and different angles can form different blasting effects, and the upper tungsten needle 102 and the lower tungsten rod 103 can be intact after blasting, so that the requirement of repeated use for many times is met.

Preferably, the blasting media 8 comprises water; namely, water is gasified instantly at the moment of explosion to generate high temperature and high pressure to generate explosion, namely, the explosion effect which is not inferior to that of the original strong explosive can be generated only by adopting water.

Preferably, the upper tungsten needle 102 and the lower tungsten rod 103 are made of metal tungsten, and the metal tungsten is hard and can meet the requirement of repeated use without damage.

Preferably, the upper tungsten needle 102 and the lower tungsten rod 103 are both columnar and coaxial with the blasting cartridge 1; the upper tungsten needle 102 and the lower tungsten rod 103 are ensured to be positioned on the axis of the explosive cylinder 1, and the explosive force is uniformly punched out of the guide hole 101 during the detonation, so that the optimal blasting effect is achieved.

Preferably, the upper tungsten needle 102 and the lower tungsten rod 103 are opposite to each other in head, the upper tungsten needle 102 is located above the lower tungsten rod 103, the tail of the upper tungsten needle 102 is connected to the positive electrode of the external power supply 7, and the tail of the lower tungsten rod 103 is connected to the negative electrode of the external power supply 7.

Preferably, the expansion sealing cylinder 2 further comprises an expansion shaft 203 and an expansion sleeve 204, the expansion shaft 203 is in a cylindrical shape with a hollow inner portion along the axial direction, two ends of the outer circumference of the expansion shaft 203 are respectively in threaded connection with the expansion sleeve 204, the expansion sleeve 204 is driven by the threads to move axially when the expansion shaft 203 rotates so as to expand the expansion framework 202, and the expansion framework 202 radially and outwardly extrudes the flexible expansion sealing material 201 to radially seal the blast hole 6.

Preferably, the expansion framework 202 is a cylinder formed by splicing tile-shaped expansion sheets 205 with the same shape and the same size, the expansion framework 202 is sleeved outside the expansion sleeve 204, an outer taper 206 is arranged outside the expansion sleeve 204, an inner taper 207 is arranged inside the expansion sheet 205, and the outer taper 206 displaces the inner taper 207 when the expansion sleeve 204 is stressed to move axially so as to radially open the expansion sheet 205.

Preferably, the transmission cylinder 3 further includes a transmission flange 302, the transmission flange 302 is divided into an upper flange 303 and a lower flange 304, a convex boss 305 is disposed on a bottom surface of the upper flange 303, a concave groove 306 is disposed on a top surface of the lower flange 304, the upper flange 303 is tightly connected to a lower end of the transmission rod 301, the lower flange 304 is tightly connected to the expansion sealing cylinder 2, and the transmission rod 301 can transmit the torque to the expansion sealing cylinder 2 after the boss 305 sinks into the groove 306.

Preferably, the bottom of the lower tungsten rod 103 is connected with a metal corrugated pipe 104 coaxial with the lower tungsten rod 103, and a corrugated pipe wall of the metal corrugated pipe 104 can axially absorb pressure downwards and release elasticity upwards; during blasting, the corrugated pipe wall of the metal corrugated pipe 104 is axially expanded in a thread shape, is extruded by the blasting force to axially contract downwards to absorb pressure, the distance between the upper tungsten needle 102 and the lower tungsten rod 103 is pulled open, after blasting is finished, the metal corrugated pipe 104 releases elastic force to return upwards, the position is recovered to the position before blasting, next blasting can be carried out at any time after the blasting medium 8 is supplemented, and the metal corrugated pipe can be reused at any time.

Preferably, the metal corrugated tube 104 is electrically connected to the blasting cartridge 1, an insulating sleeve 105 is arranged between the upper tungsten needle 102 and the blasting cartridge 1, the positive electrode of the lead 5 is electrically connected to the upper tungsten needle 102, and the negative electrode of the lead 5 is electrically connected to the lower tungsten rod 103 through the blasting cartridge 1 and the metal corrugated tube 104.

The invention has the beneficial effects that:

according to the invention, the mutual heads of the upper tungsten needle and the lower tungsten rod are opposite to each other in the thick-wall cylindrical blasting barrel with the guide hole through the high-pressure electromagnetic force blasting device, and blasting media are injected into the blasting barrel, so that the blasting media in the blasting barrel are instantly gasified during blasting, and huge high-temperature high-pressure blasting force is generated to explode and detonate the blasting hole outwards from the guide hole, thereby replacing the traditional blasting, realizing a new generation of explosive-free blasting technology, simultaneously, the high-voltage electric porcelain blasting device does not need to be filled in after the secondary drilling, the next round of blasting can be rapidly carried out only by simply and rapidly supplementing the blasting media (such as water), and the problems of time and labor waste and low efficiency caused by the need of re-drilling and filling the high-voltage electric porcelain blasting device every time of the conventional.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments of the present invention or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a front sectional view of a reusable high-pressure electromagnetic force blasting apparatus of the present invention;

FIG. 2 is an overall exploded view of the present invention;

FIG. 3 is a partially enlarged schematic view of the explosive cartridge according to the present invention;

FIG. 4 is a partially exploded perspective view of the transmission barrel;

FIG. 5 is a partially exploded perspective view of the inflatable sealing cartridge;

fig. 6 is a partially exploded perspective view of the explosive cartridge.

In the figure, 1, a blasting cartridge; 2. an expansion seal cartridge; 3. a transmission cylinder; 4. a blasting rod; 5. a wire; 6. a blast hole; 7. an external power supply; 8. a blasting media; 101. a guide hole 102, an upper tungsten needle 103 and a lower tungsten rod; 104. a metal bellows; 105. an insulating sleeve; 201. a flexible intumescent sealing material; 202. expanding the skeleton; 203. an expansion shaft; 204. an expansion sleeve; 205. an intumescent sheet; 206. external taper; 207. inner conicity; 301. a transmission rod; 302. a transmission flange; 303. an upper flange plate; 304. a lower flange plate; 305. a boss; 306. and (4) a groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the present invention. The terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.

Further, the blasting media 8 comprises water; namely, water is gasified instantly at the moment of explosion to generate high temperature and high pressure to generate explosion, namely, the explosion effect which is not inferior to that of the original strong explosive can be generated only by adopting water.

Further, the upper tungsten needle 102 and the lower tungsten rod 103 are both made of metal tungsten, and the metal tungsten is hard and can meet the requirement of repeated use without damage.

Further, the upper tungsten needle 102 and the lower tungsten rod 103 are both columnar and coaxial with the blasting cartridge 1; the upper tungsten needle 102 and the lower tungsten rod 103 are ensured to be positioned on the axis of the explosive cylinder 1, and the explosive force is uniformly punched out of the guide hole 101 during the detonation, so that the optimal blasting effect is achieved.

Furthermore, the upper tungsten needle 102 and the lower tungsten rod 103 are opposite to each other in head, the upper tungsten needle 102 is located above the lower tungsten rod 103, the tail of the upper tungsten needle 102 is connected to the positive electrode of the external power supply 7, and the tail of the lower tungsten rod 103 is connected to the negative electrode of the external power supply 7.

Further, the expansion sealing cylinder 2 further comprises an expansion shaft 203 and an expansion sleeve 204, the expansion shaft 203 is in a cylindrical shape with a hollow inner part along the axial direction, two ends of the outer circumference of the expansion shaft 203 are respectively in threaded connection with the expansion sleeve 204, the expansion shaft 203 drives the expansion sleeve 204 to axially move when rotating so as to open the expansion framework 202, and the expansion framework 202 radially and outwardly extrudes the flexible expansion sealing material 201 to radially seal the blast hole 6.

Furthermore, the expansion framework 202 is a cylinder formed by splicing tile-shaped expansion sheets 205 with the same shape and the same size, the expansion framework 202 is sleeved outside the expansion sleeve 204, an outer taper 206 is arranged outside the expansion sleeve 204, an inner taper 207 is arranged inside the expansion sheet 205, and when the expansion sleeve 204 is stressed to move axially, the outer taper 206 displaces the inner taper 207 so as to radially open the expansion sheet 205.

Further, the transmission cylinder 3 further comprises a transmission flange 302, the transmission flange 302 is divided into an upper flange plate 303 and a lower flange plate 304, a convex boss 305 is arranged on the bottom surface of the upper flange plate 303, a concave groove 306 is arranged on the top surface of the lower flange plate 304, the upper flange plate 303 is tightly connected to the lower end of the transmission rod 301, the lower flange plate 304 is tightly connected to the expansion sealing cylinder 2, and the transmission rod 301 can transmit torque to the expansion sealing cylinder 2 after the boss 305 sinks into the groove 306.

Further, the bottom of the lower tungsten rod 103 is connected with a metal corrugated pipe 104 coaxial with the lower tungsten rod 103, and the corrugated pipe wall of the metal corrugated pipe 104 can axially absorb pressure downwards and release elasticity upwards; during blasting, the corrugated pipe wall of the metal corrugated pipe 104 is axially expanded in a thread shape, is extruded by the blasting force to axially contract downwards to absorb pressure, the distance between the upper tungsten needle 102 and the lower tungsten rod 103 is pulled open, after blasting is finished, the metal corrugated pipe 104 releases elastic force to return upwards, the position is recovered to the position before blasting, next blasting can be carried out at any time after the blasting medium 8 is supplemented, and the metal corrugated pipe can be reused at any time.

Further, the metal corrugated pipe 104 is electrically connected with the blasting cartridge 1, an insulating sleeve 105 is arranged between the upper tungsten needle 102 and the blasting cartridge 1, the positive electrode of the lead 5 is electrically connected with the upper tungsten needle 102, and the negative electrode of the lead 5 is electrically connected with the lower tungsten rod 103 through the blasting cartridge 1 and the metal corrugated pipe 104.

Examples

In practical use, firstly, the blasting device is put into the punched blast hole 6, so that the blasting cartridge 1 reaches a preset blasting position; next, the blasting medium 8 is put into the inner space of the explosive cartridge 1 through the hollow hole inside the blasting rod 4. Then, the transmission rod 301 is rotated, the transmission rod 301 drives the expansion shaft 203 to synchronously rotate through the transmission flange 302, the expansion shaft 203 drives the expansion sleeve 205 with opposite rotation directions to move oppositely, and further the expansion framework 202 is expanded to radially expand the flexible expansion sealing material 201 to complete the radial sealing of the expansion sealing cylinder 2; thirdly, blasting media 8 are injected into the blasting cartridge 1 through the blasting rod 4, and fourthly, an external power supply 7 is connected to the lead 5; and finally, an external power supply 7 is turned on, high-voltage current initiates electric arc between the upper tungsten needle 102 and the lower tungsten rod 103 to instantly gasify the blasting medium 8, blasting is initiated in a closed space, the blasting impact force is punched out through the guide hole 101 and explodes the blasting hole 6, meanwhile, the metal corrugated pipe 104 is extruded by the blasting force to shrink downwards to absorb pressure, and after the blasting is finished, the metal corrugated pipe 104 releases elastic force and returns upwards to the position before the blasting. At this point, a round of blasting is finished. When needing to blast once more, only need supply blasting medium 8 back can carry out next blasting in time, really realized can repetitious usage at any time and need not to punch once more and need not fill high-tension electric porcelain blasting unit once more.

In conclusion, the reusable high-pressure electromagnetic force blasting device disclosed by the invention has the advantages that the high-pressure electromagnetic force blasting device is used for instantly gasifying the blasting medium in the closed blasting hole to generate huge high-temperature high-pressure impact force for blasting, the traditional blasting is replaced, the new generation of explosive-free blasting technology is realized, and meanwhile, electric arcs can be initiated for many times between the upper tungsten needle and the lower tungsten rod, so that the simple, rapid and repeated blasting is realized, and the reusable high-pressure electromagnetic force blasting device has a wide application prospect.

The embodiments in the present specification are described in a progressive manner, and the same or similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments.

The above examples are only for illustrating the technical solutions of the present invention, and are not to be construed as limiting the present invention; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A reusable high-pressure electromagnetic force blasting device is characterized by comprising a blasting cylinder (1), an expansion sealing cylinder (2), a transmission cylinder (3) and a blasting rod (4), the explosive cartridge (1) is a thick-wall cylinder, a plurality of guide holes (101) are arranged on the side wall of the explosive cartridge (1) and are communicated with the inside and the outside of the explosive cartridge (1), an upper tungsten needle (102) and a lower tungsten rod (103) which are conductive are arranged in the blasting cartridge (1), the upper tungsten needle (102) and the lower tungsten rod (103) are mutually insulated, the expansion sealing cylinder (2) is a cylinder with an outer layer provided with a flexible expansion sealing material (201) and an inner layer provided with an expansion framework (202), the transmission cylinder (3) is in a long cylinder shape, a coaxial hollow transmission rod (301) is arranged in the transmission cylinder (3), the blasting rod (4) is a long straight circular tube, and a lead (5) is laid on the inner wall of the long straight circular tube;

the explosion cylinder (1), the expansion sealing cylinder (2) and the transmission cylinder (3) are sequentially arranged from inside to outside along the axial direction in the self-explosion hole (6), the explosion rod (4) axially penetrates through the expansion sealing cylinder (2) and the transmission cylinder (3), the explosion cylinder (1), the expansion sealing cylinder (2), the transmission cylinder (3), the explosion rod (4) and the transmission rod (301) are coaxial, the lower end of the explosion rod (4) extends into the explosion cylinder (1), the upper end of the explosion rod extends out of the self-explosion hole (6), the positive electrode and the negative electrode of one end of the lead (5) are respectively connected with the upper tungsten needle (102) and the lower tungsten rod (103), and the other end of the lead (5) is connected with an external power supply (7);

the explosion cylinder (1) is used for blasting the explosion hole (6), the expansion sealing cylinder (2) is used for radially expanding and sealing the explosion hole (6), the transmission cylinder (3) is used for providing expansion sealing torque for the expansion sealing cylinder (2), and during explosion, the external power supply (7) releases high-voltage current to initiate electric arc between the upper tungsten needle (102) and the lower tungsten rod (103) to instantaneously gasify the explosion medium (8) filled in the explosion cylinder (1) to cause explosion force to rush out from the guide hole (101) and blast the explosion hole (6).

2. A reusable high pressure electromagnetic force blasting apparatus according to claim 1, wherein the blasting media (8) comprises water.

3. A reusable high-pressure electromagnetic force blasting device according to claim 1, wherein the upper tungsten needle (102) and the lower tungsten rod (103) are made of metallic tungsten.

4. The reusable high-pressure electromagnetic force blasting device according to claim 1, wherein the upper tungsten needle (102) and the lower tungsten rod (103) are both cylindrical and coaxial with the blasting cartridge (1).

5. The reusable high-voltage electromagnetic force blasting device according to claim 4, wherein the upper tungsten needle (102) and the lower tungsten rod (103) are opposite to each other in head, the upper tungsten needle (102) is located above the lower tungsten rod (103), the tail of the upper tungsten needle (102) is connected to the positive pole of the external power supply (7), and the tail of the lower tungsten rod (103) is connected to the negative pole of the external power supply (7).

6. The reusable high-pressure electromagnetic force blasting device according to claim 1, wherein the expansion sealing cylinder (2) further comprises an expansion shaft (203) and an expansion sleeve (204), the expansion shaft (203) is in a cylindrical shape with a hollow interior along the axial direction, two ends of the outer circumference of the expansion shaft (203) are respectively in threaded connection with the expansion sleeve (204), when the expansion shaft (203) rotates, the expansion sleeve (204) is driven by the threads to move axially so as to expand the expansion framework (202), and the expansion framework (202) radially and outwardly extrudes the flexible expansion sealing material (201) to radially seal the blasting hole (6).

7. The reusable high-pressure electromagnetic force blasting device according to claim 6, wherein the expansion framework (202) is a cylindrical shape formed by splicing tile-shaped expansion pieces (205) with the same shape and the same size, the expansion framework (202) is sleeved outside the expansion sleeve (204), an external taper (206) is arranged outside the expansion sleeve (204), an internal taper (207) is arranged inside the expansion piece (205), and when the expansion sleeve (204) is stressed to move axially, the external taper (206) pushes the internal taper (207) to radially open the expansion piece (205).

8. The reusable high-pressure electromagnetic force blasting device according to claim 1, wherein the transmission barrel (3) further comprises a transmission flange (302), the transmission flange (302) is divided into an upper flange (303) and a lower flange (304), a lower surface of the upper flange (303) is provided with a downward convex boss (305), a top surface of the lower flange (304) is provided with a downward concave groove (306), the upper flange (303) is fixedly connected to the lower end of the transmission rod (301), the lower flange (304) is fixedly connected to the expansion sealing barrel (2), and the transmission rod (301) can transmit torque to the expansion sealing barrel (2) after the boss (305) sinks into the groove (306).

9. The reusable high-pressure electromagnetic force blasting device according to claim 1, wherein a metal bellows (104) coaxial with the lower tungsten rod (103) is connected to the bottom of the lower tungsten rod (103), and a corrugated tube wall of the metal bellows (104) can axially absorb pressure downwards and release elastic force upwards.

10. The reusable high-pressure electromagnetic force blasting device according to claim 9, wherein the metal bellows (104) is electrically connected to the blasting cartridge (1), an insulating sleeve (105) is arranged between the upper tungsten needle (102) and the blasting cartridge (1), the positive electrode of the wire (5) is electrically connected to the upper tungsten needle (102), and the negative electrode of the wire (5) is electrically connected to the lower tungsten rod (103) through the blasting cartridge (1) and the metal bellows (104).