A reusable high-voltage electromagnetic blasting device

Abstract

The present invention discloses a reusable high-voltage electromagnetic blasting device, comprising a blasting tube, an expansion sealing tube, a transmission tube, and a blasting rod; the blasting tube, the expansion sealing tube, and the transmission tube are arranged in sequence from the inside to the outside along the axial direction in the blasting hole, the blasting rod passes through the expansion sealing tube and the transmission tube along the axial direction, the lower end of the blasting rod extends into the blasting tube, and the upper end extends out of the blasting hole, the positive and negative poles at one end of the wire are respectively connected to the upper tungsten needle and the lower tungsten rod located in the blasting tube, and the positive and negative poles at the other end of the wire are connected to an external power supply; the blasting tube is used to blast the blasting hole, the expansion sealing tube is used to radially expand and seal the blasting hole, and the transmission tube is used to provide expansion and sealing torque to the expansion sealing tube, when blasting, the external power supply releases a high-voltage current to initiate an arc between the upper tungsten needle and the lower tungsten rod to instantly vaporize the blasting medium and trigger blasting, and the blasting can be repeated for simple and efficient use. The present invention replaces traditional blasting while realizing a new generation of reusable explosive-free blasting technology.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage electromagnetic blasting, in particular to a reusable high-voltage electromagnetic blasting device. Background Art

[0002] Blasting technology plays a crucial role in large-scale projects such as railways, highways, mines, and reservoirs. Blasting technology is used in mining, tunneling, road construction, and urban demolition of old buildings. With economic development and the increase in construction projects, blasting has attracted increasing attention. As is well known, current blasting technology uses explosives for blasting. However, the variety of explosives varies, their effectiveness varies, and precise control is difficult. Furthermore, transportation, storage, and management pose significant safety risks, making them extremely dangerous.

[0003] High-voltage electromagnetic blasting involves a momentary high-voltage discharge within a confined space, which vaporizes the blasting medium and then creates an explosion within the confined space to achieve the desired blasting target. High-voltage electromagnetic blasting offers comprehensive advantages, including safe and reliable transportation, storage, and management, as well as precise control of the explosive yield through controlled discharge. However, using a fuse as the medium for instantaneous vaporization is often a one-time blast. After the blast is complete, the fuse vaporizes and disappears, necessitating a new blast or the next round of blasting, requiring re-drilling and re-filling of the high-voltage porcelain blasting device. This is time-consuming, labor-intensive, and inefficient. Consequently, no viable, reusable high-voltage electromagnetic blasting device exists to overcome this challenge. Summary of the Invention

[0004] The embodiment of the present invention provides a reusable high-voltage electromagnetic blasting device, including a blasting tube 1, an expansion sealing tube 2, a transmission tube 3, and a blasting rod 4. The blasting tube 1 is a thick-walled cylindrical tube. A plurality of guide holes 101 are provided on the side wall of the blasting tube 1 to connect the inside and outside of the blasting tube 1. A conductive upper tungsten needle 102 and a lower tungsten rod 103 are provided inside the blasting tube 1. The upper tungsten needle 102 and the lower tungsten rod 103 are insulated from each other. The expansion sealing tube 2 is provided with a flexible expansion sealing material 201 on the outer layer and an expansion skeleton 202 on the inner layer. Cylinder, the transmission cylinder 3 is an elongated cylindrical shape, and a coaxial hollow transmission rod 301 is provided inside the transmission cylinder 3. The blasting rod 4 is a long straight round tube with a wire 5 laid on the inner wall; the blasting cylinder 1, the expansion sealing cylinder 2, and the transmission cylinder 3 are arranged in sequence from the inside to the outside along the axial direction in the blasting hole 6, and the blasting rod 4 passes through the expansion sealing cylinder 2 and the transmission cylinder 3 along the axial direction. The blasting cylinder 1, the expansion sealing cylinder 2, the transmission cylinder 3, the blasting rod 4, and the transmission rod 301 are coaxial. The lower end of the blasting rod 4 extends into the blasting cylinder 1 and the upper end extends out of the blasting hole 6. The wire 5 The positive and negative electrodes at one end are connected to the upper tungsten needle 102 and the lower tungsten rod 103 respectively, and the positive and negative electrodes at the other end of the wire 5 are connected to the external power supply 7; the blasting tube 1 is used to blast the target in the blasting hole 6, the expansion sealing tube 2 is used to radially expand and seal the blasting hole 6, and the transmission tube 3 is used to provide expansion sealing torque to the expansion sealing tube 2. During blasting, the external power supply 7 releases a high-voltage current to initiate an arc between the upper tungsten needle 102 and the lower tungsten rod 103, instantly vaporizing the blasting medium 8 filled in the blasting tube 1 and triggering the blasting force to guide the hole 101. During blasting, the external power supply 7 instantly releases a high-voltage current of 5000-30000 volts through the high-voltage capacitor to instantly vaporize and detonate the blasting medium 8 in the narrow space of the blasting tube 1. The powerful impact force creates an explosion effect that is stronger than that of equal volume high explosives. Moreover, the guide holes 101 in different directions, sizes and angles can form different explosion effects. The upper tungsten needle 102 and the lower tungsten rod 103 can remain intact after blasting, meeting the needs of multiple reuse.

[0005] Preferably, the blasting medium 8 includes water; that is, the water is instantly gasified into high temperature and high pressure at the moment of blasting to produce an explosion, that is, only water can produce an explosion effect that is no less than that of the original high explosives.

[0006] Preferably, the upper tungsten needle 102 and the lower tungsten rod 103 are both made of metal tungsten, which is hard and can withstand repeated use without damage.

[0007] Preferably, the upper tungsten needle 102 and the lower tungsten rod 103 are both columnar and coaxial with the blasting tube 1; this ensures that the upper tungsten needle 102 and the lower tungsten rod 103 are located on the axis of the blasting tube 1, and when detonated, the blasting force evenly rushes out of the guide hole 101 to achieve the best blasting effect.

[0008] More preferably, the upper tungsten needle 102 and the lower tungsten rod 103 are facing each other and 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.

[0009] Preferably, the expansion sealing cylinder 2 also includes an expansion shaft 203 and an expansion sleeve 204. The expansion shaft 203 is a cylindrical shape that is hollow inside along the axial direction. The two ends of the outer circumference of the expansion shaft 203 are respectively threadedly connected to the expansion sleeve 204. When the expansion shaft 203 rotates, the thread drives the expansion sleeve 204 to move axially and then expand the expansion skeleton 202. The expansion skeleton 202 radially squeezes the flexible expansion sealing material 201 outward to radially seal the blasting hole 6.

[0010] More preferably, the expansion skeleton 202 is a cylindrical shape formed by splicing together tile-shaped expansion pieces 205 of the same shape and size. The expansion skeleton 202 is mounted on the outside of the expansion sleeve 204. The outside of the expansion sleeve 204 is provided with an outer taper 206, and the inside of the expansion piece 205 is provided with an inner taper 207. When the expansion sleeve 204 is subjected to force and moves axially, the outer taper 206 displaces the inner taper 207 and radially expands the expansion piece 205.

[0011] Preferably, the transmission cylinder 3 also includes a transmission flange 302, which is divided into an upper flange 303 and a lower flange 304. The bottom surface of the upper flange 303 is provided with a downward convex boss 305, and the top surface of the lower flange 304 is provided with a concave groove 306. The upper flange 303 is fastened to the lower end of the transmission rod 301, and the lower flange 304 is fastened to the expansion sealing cylinder 2. After the boss 305 sinks into the groove 306, the transmission rod 301 can transmit the torque to the expansion sealing cylinder 2.

[0012] Preferably, the bottom of the lower tungsten rod 103 is connected to a metal bellows 104 coaxial with the lower tungsten rod 103, and the corrugated tube wall of the metal bellows 104 can absorb pressure downward in the axial direction and release elastic force upward; during blasting, the corrugated tube wall of the metal bellows 104 is expanded in a threaded shape along the axial direction, and is squeezed by the blasting force and contracts axially downward to absorb pressure, thereby widening the distance between the upper tungsten needle 102 and the lower tungsten rod 103. After the blasting is over, the metal bellows 104 releases the elastic force and returns to its position before the blasting. After the blasting medium 8 is replenished, the next blasting can be carried out at any time, truly realizing that it can be reused at any time.

[0013] Preferably, the metal bellows 104 is conductively connected to the blasting tube 1, an insulating sleeve 105 is provided between the upper tungsten needle 102 and the blasting tube 1, the positive pole of the wire 5 is conductively connected to the upper tungsten needle 102, and the negative pole of the wire 5 is conductively connected to the lower tungsten rod 103 through the blasting tube 1 and the metal bellows 104.

[0014] The beneficial effects of the present invention are:

[0015] The present invention uses a high-voltage electromagnetic blasting device to place the heads of an upper tungsten needle and a lower tungsten rod facing each other in a thick-walled cylindrical blasting tube provided with a guide hole, and injects a blasting medium into the blasting tube. During blasting, the blasting medium in the blasting tube is instantly vaporized, generating a huge high-temperature and high-pressure blasting force that explodes outward from the guide hole to detonate the blasting hole, replacing traditional blasting and realizing a new generation of explosive-free blasting technology. At the same time, there is no need to drill holes again or fill high-voltage electric porcelain blasting devices again. Only the blasting medium (such as water) needs to be simply and quickly replenished to quickly carry out the next round of blasting, thus solving the problem of time-consuming, labor-intensive and inefficient re-drilling and re-filling high-voltage electric porcelain blasting devices in previous blasting. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments of the present invention or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a front cross-sectional view of a reusable high-voltage electromagnetic blasting device according to the present invention;

[0018] Figure 2 It is an overall exploded schematic diagram of the present invention;

[0019] Figure 3 This is a partially enlarged schematic diagram of the blasting tube of the present invention;

[0020] Figure 4 It is a partially exploded perspective schematic diagram of the transmission cylinder;

[0021] Figure 5 It is a partially exploded perspective schematic diagram of the expansion sealing cylinder;

[0022] Figure 6 This is a partially exploded three-dimensional schematic diagram of the blasting tube.

[0023] In the figure, 1. blasting tube; 2. expansion sealing tube; 3. transmission tube; 4. blasting rod; 5. wire; 6. blasting hole; 7. external power supply; 8. blasting medium; 101. guide hole; 102. upper tungsten needle; 103. lower tungsten rod; 104. metal bellows; 105. insulating sleeve; 201. flexible expansion sealing material; 202. expansion skeleton; 203. expansion shaft; 204. expansion sleeve; 205. expansion sheet; 206. outer taper; 207. inner taper; 301. transmission rod; 302. transmission flange; 303. upper flange; 304. lower flange; 305. boss; 306. groove. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0025] In the description of the embodiments of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. The terms "first", "second" and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to the specific circumstances.

[0026] The embodiment of the present invention provides a reusable high-voltage electromagnetic blasting device, including a blasting tube 1, an expansion sealing tube 2, a transmission tube 3, and a blasting rod 4. The blasting tube 1 is a thick-walled cylindrical tube. A plurality of guide holes 101 are provided on the side wall of the blasting tube 1 to connect the inside and outside of the blasting tube 1. A conductive upper tungsten needle 102 and a lower tungsten rod 103 are provided inside the blasting tube 1. The upper tungsten needle 102 and the lower tungsten rod 103 are insulated from each other. The expansion sealing tube 2 is provided with a flexible expansion sealing material 201 on the outer layer and an expansion skeleton 202 on the inner layer. Cylinder, the transmission cylinder 3 is an elongated cylindrical shape, and a coaxial hollow transmission rod 301 is provided inside the transmission cylinder 3. The blasting rod 4 is a long straight round tube with a wire 5 laid on the inner wall; the blasting cylinder 1, the expansion sealing cylinder 2, and the transmission cylinder 3 are arranged in sequence from the inside to the outside along the axial direction in the blasting hole 6, and the blasting rod 4 passes through the expansion sealing cylinder 2 and the transmission cylinder 3 along the axial direction. The blasting cylinder 1, the expansion sealing cylinder 2, the transmission cylinder 3, the blasting rod 4, and the transmission rod 301 are coaxial. The lower end of the blasting rod 4 extends into the blasting cylinder 1 and the upper end extends out of the blasting hole 6. The wire 5 The positive and negative electrodes at one end are connected to the upper tungsten needle 102 and the lower tungsten rod 103 respectively, and the positive and negative electrodes at the other end of the wire 5 are connected to the external power supply 7; the blasting tube 1 is used to blast the target in the blasting hole 6, the expansion sealing tube 2 is used to radially expand and seal the blasting hole 6, and the transmission tube 3 is used to provide expansion sealing torque to the expansion sealing tube 2. During blasting, the external power supply 7 releases a high-voltage current to initiate an arc between the upper tungsten needle 102 and the lower tungsten rod 103, instantly vaporizing the blasting medium 8 filled in the blasting tube 1 and triggering the blasting force to guide the hole 101. During blasting, the external power supply 7 instantly releases a high-voltage current of 5000-30000 volts through the high-voltage capacitor to instantly vaporize and detonate the blasting medium 8 in the narrow space of the blasting tube 1. The powerful impact force creates an explosion effect that is stronger than that of equal volume high explosives. Moreover, the guide holes 101 in different directions, sizes and angles can form different explosion effects. The upper tungsten needle 102 and the lower tungsten rod 103 can remain intact after blasting, meeting the needs of multiple reuse.

[0027] Furthermore, the blasting medium 8 includes water; that is, the water is instantly gasified into high temperature and high pressure at the moment of blasting to produce an explosion, that is, only water can produce an explosion effect that is no less than that of the original high explosives.

[0028] Furthermore, the upper tungsten needle 102 and the lower tungsten rod 103 are both made of metal tungsten, which is hard and can withstand repeated use without damage.

[0029] Furthermore, the upper tungsten needle 102 and the lower tungsten rod 103 are both columnar and coaxial with the blasting tube 1, ensuring that the upper tungsten needle 102 and the lower tungsten rod 103 are located on the axis of the blasting tube 1. When detonated, the blasting force evenly rushes out from the guide hole 101 to achieve the best blasting effect.

[0030] Furthermore, the upper tungsten needle 102 and the lower tungsten rod 103 are facing each other and 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.

[0031] Furthermore, the expansion sealing cylinder 2 also includes an expansion shaft 203 and an expansion sleeve 204. The expansion shaft 203 is a cylindrical shape that is hollow inside along the axial direction. The two ends of the outer circumference of the expansion shaft 203 are respectively threadedly connected to the expansion sleeve 204. When the expansion shaft 203 rotates, the thread drives the expansion sleeve 204 to move axially and then expand the expansion skeleton 202. The expansion skeleton 202 radially squeezes the flexible expansion sealing material 201 outward to radially seal the blasting hole 6.

[0032] Furthermore, the expansion skeleton 202 is a cylindrical shape formed by splicing tile-shaped expansion pieces 205 of the same shape and size. The expansion skeleton 202 is mounted on the outside of the expansion sleeve 204. The outside of the expansion sleeve 204 is provided with an outer taper 206, and the inside of the expansion piece 205 is provided with an inner taper 207. When the expansion sleeve 204 is subjected to force and moves axially, the outer taper 206 displaces the inner taper 207 and radially expands the expansion piece 205.

[0033] Furthermore, the transmission cylinder 3 also includes a transmission flange 302, which is divided into an upper flange 303 and a lower flange 304. The bottom surface of the upper flange 303 is provided with a downward convex boss 305, and the top surface of the lower flange 304 is provided with a concave groove 306. The upper flange 303 is fastened to the lower end of the transmission rod 301, and the lower flange 304 is fastened to the expansion sealing cylinder 2. After the boss 305 sinks into the groove 306, the transmission rod 301 can transmit torque to the expansion sealing cylinder 2.

[0034] Furthermore, the bottom of the lower tungsten rod 103 is connected to a metal bellows 104 coaxial with the lower tungsten rod 103. The corrugated tube wall of the metal bellows 104 can absorb pressure downward in the axial direction and release elastic force upward. During blasting, the corrugated tube wall of the metal bellows 104 expands in a threaded shape along the axial direction, and is squeezed by the blasting force and contracts downward in the axial direction to absorb pressure, thereby widening the distance between the upper tungsten needle 102 and the lower tungsten rod 103. After the blasting is completed, the metal bellows 104 releases the elastic force and returns to its position before the blasting. After the blasting medium 8 is replenished, the next blasting can be carried out at any time, truly realizing that it can be reused at any time.

[0035] Furthermore, the metal bellows 104 is conductively connected to the blasting tube 1, an insulating sleeve 105 is provided between the upper tungsten needle 102 and the blasting tube 1, the positive pole of the wire 5 is conductively connected to the upper tungsten needle 102, and the negative pole of the wire 5 is conductively connected to the lower tungsten rod 103 through the blasting tube 1 and the metal bellows 104.

[0036] Example

[0037] In actual use, first, the blasting device is placed into the drilled blasting hole 6 so that the blasting tube 1 reaches the preset blasting position; secondly, the blasting medium 8 is placed into the internal space of the blasting tube 1 through the hollow hole inside the blasting rod 4. Next, the transmission rod 301 is rotated, driving the expansion shaft 203 through the transmission flange 302 to rotate synchronously. The expansion shaft 203 drives the expansion sleeve 204, which rotates in the opposite direction, to move in the opposite direction, thereby expanding the expansion frame 202 and radially expanding the flexible expansion sealing material 201, completing the radial sealing of the expansion sealing tube 2. Third, the blasting medium 8 is injected into the blasting tube 1 through the blasting rod 4. Fourth, the external power supply 7 is connected to the wire 5. Finally, the external power supply 7 is turned on. A high-voltage current generates an arc between the upper tungsten needle 102 and the lower tungsten rod 103, instantly vaporizing the blasting medium 8 and triggering an explosion in the confined space. The blasting force is released through the guide hole 101 and explodes the blasting hole 6. Simultaneously, the metal bellows 104 is squeezed downward by the blasting force to absorb the pressure. After the blasting is completed, the metal bellows 104 releases its elastic force and returns to its original position before the blasting. This completes one blasting cycle. When blasting is needed again, the blasting medium 8 only needs to be replenished and the next blasting can be carried out at any time, which truly realizes the ability to be reused multiple times at any time without the need to drill holes again or fill in the high-voltage porcelain blasting device again.

[0038] In summary, the present invention is a reusable high-pressure electromagnetic blasting device, which instantly vaporizes the blasting medium in a closed blasting hole through the high-pressure electromagnetic blasting device, generating huge high-temperature and high-pressure impact force for blasting, replacing traditional blasting while realizing a new generation of explosive-free blasting technology. At the same time, the upper tungsten needle and the lower tungsten rod can ignite an arc multiple times, thereby realizing simple and quick repeated blasting. Therefore, the present invention has broad application prospects.

[0039] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0040] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it should be understood by those skilled in the art that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the present invention.

Claims

1. A reusable high-voltage electromagnetic blasting device, characterized in that: The high-voltage electromagnetic blasting device adopts high-voltage electromagnetic blasting, which refers to a blasting method in which high voltage discharge is instantaneously performed in a closed space, the blasting medium is instantly vaporized, and then an explosion is generated in the closed space to achieve the blasting target; it includes: a blasting tube, an expansion sealing tube, a transmission tube, and a blasting rod. The blasting tube is a thick-walled cylindrical tube. A plurality of guide holes are provided on the side wall of the blasting tube to connect the inside and outside of the blasting tube. A conductive upper tungsten needle and a lower tungsten rod are provided in the blasting tube. The upper tungsten needle and the lower tungsten rod are insulated from each other. The expansion sealing tube is a cylinder with a flexible expansion sealing material on the outer layer and an expansion skeleton on the inner layer. The transmission tube is an elongated cylindrical tube. A coaxial hollow transmission rod is provided inside the transmission tube. The blasting rod is a long straight round tube with a wire laid on the inner wall. The blasting tube, expansion sealing tube, and transmission tube are arranged in sequence from inside to outside along the axial direction in the blasting hole. The blasting rod passes through the expansion sealing tube and the transmission tube along the axial direction. The blasting tube, expansion sealing tube, transmission tube, blasting rod, and transmission rod are coaxial. The lower end of the blasting rod extends into the blasting tube and the upper end extends out of the blasting hole. The positive and negative poles of one end of the wire are connected to the upper tungsten needle and the lower tungsten rod respectively, and the other end of the wire is connected to an external power supply. The blasting tube is used to blast the blasting hole, the expansion sealing tube is used to radially expand and seal the blasting hole, and the transmission tube is used to provide the expansion sealing tube with expansion and sealing torque. During blasting, the external power supply releases a high-voltage current to initiate an arc between the upper tungsten needle and the lower tungsten rod, which instantly vaporizes the blasting medium filled in the blasting tube, triggering a blasting force to rush out of the guide hole and blast the blasting hole. The expansion sealing cylinder also includes an expansion shaft and an expansion sleeve. The expansion shaft is cylindrical and hollow along the axial direction. The two ends of the outer circumference of the expansion shaft are respectively threadedly connected to the expansion sleeve. When the expansion shaft rotates, the threads drive the expansion sleeve to move axially and thus expand the expansion frame. The expansion frame radially squeezes the flexible expansion sealing material outward to seal the blasting hole radially. The transmission cylinder also includes a transmission flange, which is divided into an upper flange and a lower flange. The bottom surface of the upper flange is provided with a downward convex boss, and the top surface of the lower flange is provided with a concave groove. The upper flange is fastened to the lower end of the transmission rod, and the lower flange is fastened to the expansion sealing cylinder. After the boss sinks into the groove, the transmission rod can transmit torque to the expansion sealing cylinder.

2. A reusable high-voltage electromagnetic blasting device according to claim 1, characterized in that: The blasting medium includes water.

3. A reusable high-voltage electromagnetic blasting device according to claim 1, characterized in that: The upper tungsten needle and the lower tungsten rod are both made of metal tungsten.

4. A reusable high-voltage electromagnetic blasting device according to claim 1, characterized in that: The upper tungsten needle and the lower tungsten rod are both columnar and coaxial with the blasting tube.

5. A reusable high-voltage electromagnetic blasting device according to claim 4, characterized in that: The upper tungsten needle and the lower tungsten rod are facing each other with the upper tungsten needle located above the lower tungsten rod. The tail of the upper tungsten needle is connected to the positive pole of the external power supply, and the tail of the lower tungsten rod is connected to the negative pole of the external power supply.

6. A reusable high-voltage electromagnetic blasting device according to claim 1, characterized in that: The expansion frame is a cylindrical shape formed by splicing tile-shaped expansion pieces of the same shape and size. The expansion frame is sleeved outside the expansion sleeve. The outer side of the expansion sleeve is provided with an outer taper, and the inner side of the expansion piece is provided with an inner taper. When the expansion sleeve is subjected to force and moves axially, the outer taper displaces the inner taper and radially expands the expansion piece.

7. The reusable high-voltage electromagnetic blasting device according to claim 1, characterized in that: The bottom of the lower tungsten rod is connected to a metal bellows coaxial with the lower tungsten rod. The corrugated tube wall of the metal bellows can absorb pressure downward and release elastic force upward along the axial direction.

8. A reusable high-voltage electromagnetic blasting device according to claim 7, characterized in that: The metal bellows is conductively connected to the blasting tube, an insulating sleeve is provided between the upper tungsten needle and the blasting tube, the positive pole of the wire is conductively connected to the upper tungsten needle, and the negative pole of the wire is conductively connected to the lower tungsten rod through the blasting tube and the metal bellows.

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