Blasting cartridge filling structure, blasting method and blasting device

Abstract

The invention particularly relates to a blasting cartridge filling structure, a blasting method and a blasting device, and belongs to the technical field of smooth blasting. The blasting cartridge filling structure comprises a plurality of cartridges, the cartridges are contained in a blast hole, the cartridges are configured to be free of longitudinal intervals, and the cartridges are configured to be loaded in a transverse non-coupling mode. Binding, connecting and assembling operation on explosive branches, bamboo chips and detonating cords on the blasting site is not needed, the explosive charging preparation time is greatly shortened, especially in large-scale blasting engineering, the construction progress can be remarkably accelerated, and the situation that the construction period is affected due to the fact that on-site assembling consumes too long time is avoided.

Description

Technical Field

[0001] This invention belongs to the field of smooth blasting technology, specifically relating to a blasting charge loading structure, blasting method, and blasting device. Background Technology

[0002] Currently, the explosives used in smooth blasting are generally small-diameter gelatinous emulsion explosives. Discontinuous charges are used within the borehole, with the explosive charges connected by bamboo strips and bound to the bamboo strips. Detonating cords are used to transmit the detonation between the explosive charges for stable detonation. During the blasting process, the explosive charges, bamboo strips, detonating cords, and detonators need to be assembled on-site. If the blasting project is large, this assembly process consumes a significant amount of time, affecting the project schedule. Furthermore, the high cost of detonating cords contributes to the high cost of smooth blasting.

[0003] Furthermore, shaped charge tubes are frequently used in smooth blasting. These tubes are the core charge and shaped charge device for achieving precise directional blasting and controlling the shape formation of the perimeter eye (contour hole). Especially when using a decoupled charge structure, incorporating a shaped charge tube can reduce the risk of charge eccentricity and directional disorder. After the shaped charge tube is inserted into the borehole, its shaped charge slot orientation needs to be precisely fixed to ensure that the blasting energy is released concentratedly along the designed direction. The current conventional practice is to wrap plastic foam tape around the outer wall of the shaped charge tube, using the foam tape to fill the gap between the shaped charge tube and the inner wall of the borehole, thereby achieving the positioning and attitude fixation of the shaped charge tube within the borehole. However, this method has significant drawbacks: during the insertion of the shaped charge tube into the borehole, the plastic foam tape is prone to friction and pulling against the borehole wall, causing it to break and fall off. It is difficult to continuously and stably fill the gap, ultimately failing to reliably fix the position of the shaped charge tube and the orientation of the shaped charge slot, affecting the smooth blasting effect. Summary of the Invention

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide a blasting charge loading structure, blasting method and blasting device to reduce blasting costs and improve blasting effect.

[0005] To achieve the above-mentioned objectives, the technical solution adopted by the present invention is as follows: On the one hand, the embodiments of this application provide a blasting charge loading structure, including multiple charges, the multiple charges being accommodated in a blast hole, the multiple charges being configured to be longitudinally uninterrupted, and the multiple charges being configured to be loaded with transversely uncoupled charges.

[0006] In some embodiments, the explosive charge is a low-density explosive.

[0007] On the other hand, embodiments of this application provide a demolition method, including:

[0008] Select a smooth blasting explosive that matches the detonation velocity based on the hardness of the rock to be blasted.

[0009] Drill blast holes in the rock mass;

[0010] It adopts a transversely decoupled, longitudinally continuous charging structure to continuously fill the blast hole with special explosives. There is no longitudinal gap between the explosive cartridges, and a radial gap is maintained between the blast hole and the explosive cartridge.

[0011] Detonation operation.

[0012] In another aspect, embodiments of this application provide a blasting device, including a shaped charge tube and a positioning assembly, which includes a positioning arm and a pushing part. The positioning arm is rotatably mounted on the shaped charge tube, and the axis of rotation of the positioning arm is perpendicular to the axial direction of the shaped charge tube. The pushing part is movably connected to the shaped charge tube along its axial direction and is used to push the positioning arm to rotate.

[0013] In some embodiments, the positioning arm includes multiple arm segments, which are rotatably connected to each other. The end arm segment is rotatably connected to the energy-concentrating tube. Drive arms are rotatably provided on both sides of the arm segment along the rotation axis. The rotation axis of the drive arms is perpendicular to the rotation axis of the arm segment. The drive arms are provided with airbags. The arm segment is configured such that when the drive arms on both sides of the arm segment are closed, the two adjacent arm segments are unlocked and the airbag is compressed and deformed. When the drive arms on both sides are separated, the two adjacent arm segments are locked.

[0014] In some embodiments, the drive arms on both sides of the arm segment are respectively provided with hooks, and when the drive arms on both sides of the arm segment are closed, the hooks of the drive arms on both sides are engaged.

[0015] In some embodiments, the boom segment includes two opposing limiting portions, one of which is located between the two limiting portions of the other two boom segments. The limiting portion is provided with a rotating shaft and a positioning shaft. The boom segment is provided with a first shaft hole for receiving the rotating shaft and a second shaft hole for receiving the positioning shaft. The positioning shaft is movably connected to the limiting portion along the rotation axis of the boom segment. The positioning shaft is configured to retract from the second shaft hole when the drive arm is closed.

[0016] In some embodiments, the drive arm is provided with a cam portion, and the positioning shaft is provided with a mating portion, with the cam portion abutting against the mating portion.

[0017] In some embodiments, the positioning assembly further includes a fixing part, a rotating part, and two connecting cables. The fixing part is disposed on the energy-concentrating tube, and the rotating part is rotatably disposed on the energy-concentrating tube. The fixing part and the rotating part are spaced apart along the axial direction of the energy-concentrating tube, and the rotation axis of the rotating part is parallel to the axial direction of the energy-concentrating tube. One end of each connecting cable is connected to the rotating part, and the other end is connected to the fixing part. The pushing part is provided with two threaded holes, through which the connecting cables pass.

[0018] In some embodiments, the connecting cable includes a metal segment connected to the rotating part.

[0019] The present invention has the following beneficial effects:

[0020] 1. There is no need to bind, connect and assemble the explosive charges, bamboo strips and detonating cord at the blasting site, which greatly shortens the preparation time for charging. Especially in large-scale blasting projects, it can significantly speed up the construction progress and avoid affecting the project schedule due to excessive time spent on on-site assembly.

[0021] 2. By using transversely decoupled charges, the pressure f exerted by ordinary explosives on the borehole wall is reduced to below the dynamic compressive strength Pc of the rock. However, the circumferential tensile stress of the borehole wall along the line connecting the centers of adjacent blast holes exceeds the rock's ultimate dynamic compressive strength Pc. During blasting, the rock in the borehole wall can be effectively protected, and smooth blasting cracks are generated, thus improving the smooth blasting effect.

[0022] 3. The energy-concentrating tube can be fixed inside the blast hole by the cooperation of the positioning arm and the jacking part, so that the orientation of the energy-concentrating slit can be fixed, ensuring the light explosion effect. Attached Figure Description

[0023] Figure 1 This is a front structural diagram of the blasting device of the present invention;

[0024] Figure 2 for Figure 1 Enlarged view of point A;

[0025] Figure 3 for Figure 2 Enlarged view of point C;

[0026] Figure 4 for Figure 1 Enlarged view of point B;

[0027] Figure 5 This is a schematic diagram of the rear structure of the blasting device of the present invention;

[0028] Figure 6 for Figure 5 Enlarged view of point D;

[0029] Figure 7 for Figure 5 Enlarged view of point E;

[0030] Figure 8 This is a schematic diagram showing the blasting device of the present invention installed in a blast hole.

[0031] Figure 9 for Figure 8 Enlarged view at point F;

[0032] Figure 10 for Figure 9 Enlarged view of point G.

[0033] Reference numerals: 1-Energy-concentrating tube, 2-Positioning arm, 3-Pushing part, 4-Arm section, 5-Drive arm, 6-Airbag, 7-Connecting cable, 8-Threading hole, 9-Rotating part, 10-Hook body, 11-Limiting part, 12-Rotating shaft, 13-Positioning shaft, 14-Fixing part, 15-Cam part, 16-Matching part, 17-Blast hole. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0035] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0036] On one hand, embodiments of this application provide a blasting charge loading structure, including multiple charges, which are accommodated in a borehole 17. The charges are configured to be longitudinally uninterrupted and to be loaded with laterally decoupled charges.

[0037] "Longitudinal without gaps" means that the explosive charges are arranged sequentially along the axial direction of the borehole 17.

[0038] Laterally decoupled charge means that when the charge is in the borehole 17, there is a gap between the charge and the inner wall of the borehole, that is, the charge and the borehole 17 are in clearance fit.

[0039] The technical solution proposed in this application eliminates the need for binding, connecting, and assembling explosive charges, bamboo strips, and detonating cords at the blasting site, greatly shortening the preparation time for charging. Especially in large-scale blasting projects, it can significantly accelerate the construction progress and avoid affecting the project schedule due to excessive time spent on on-site assembly.

[0040] By using transversely decoupled charges, the pressure f exerted by ordinary explosives on the borehole wall is reduced to below the dynamic compressive strength Pc of the rock. However, the circumferential tensile stress of the borehole wall along the line connecting the centers of adjacent boreholes exceeds the rock's ultimate dynamic compressive strength Pc. During blasting, the borehole wall rock is effectively protected, and smooth blasting cracks are generated, thus improving the smooth blasting effect.

[0041] In some embodiments, the explosive charge is a low-density explosive.

[0042] Low-density explosives refer to explosives whose density is reduced by using physical or chemical sensitization or a combination of sensitization during the explosive manufacturing process to increase the amount of air bubbles.

[0043] According to empirical formulas, the borehole pressure f is mainly related to the explosive itself and the charging conditions, namely:

[0044]

[0045] in:

[0046] K - Isentropic adiabatic index; D - Detonation velocity of the explosive, m / s; ρ0 - Density of the explosive, g / cm³ 3 r0 - charge radius, mm; r - borehole radius, mm. As can be seen from the above formula, for a given explosive (constant K value) and certain charging conditions (constant r0 / r value), the borehole pressure f is directly proportional to the explosive density. Therefore, using low-density explosives can adjust the explosive power and improve the flash explosion effect.

[0047] In some embodiments, the explosive cartridge may also be selected from those containing inert substances to further reduce the explosive power.

[0048] On the other hand, embodiments of this application provide a demolition method, including:

[0049] Select a smooth blasting explosive that matches the detonation velocity based on the hardness of the rock to be blasted.

[0050] 17 boreholes were drilled in the rock mass;

[0051] The structure adopts a transversely decoupled and longitudinally continuous charging structure, which continuously fills the blast hole 17 with special explosives. There is no longitudinal gap between the explosive cartridges, and a radial gap is maintained between the blast hole 17 and the explosive cartridges.

[0052] Detonation operation.

[0053] On the one hand, using low-density, low-detonation-velocity explosives combined with laterally decoupled, longitudinally continuous charges can reduce the impact pressure on the borehole wall, protect the integrity of the surrounding rock, and form a regular, smooth blasting surface. On the other hand, eliminating longitudinal intervals and detonating cord connections simplifies the charging process, improves loading efficiency and quality, and reduces construction costs. Furthermore, it avoids the pipe effect and detonation interruption, eliminates the risk of residual explosives, and enables precise matching blasting of rocks with different hardnesses.

[0054] In another aspect, embodiments of this application provide a blasting device, including a shaped charge tube 1 and a positioning assembly, which includes a positioning arm 2 and a pushing part 3. The positioning arm 2 is rotatably disposed on the shaped charge tube 1, and the rotation axis of the positioning arm 2 is perpendicular to the axial direction of the shaped charge tube 1. The pushing part 3 is movably connected to the shaped charge tube 1 along the axial direction of the shaped charge tube 1, and the pushing part 3 is used to push the positioning arm 2 to rotate.

[0055] The structure of the energy-concentrating tube 1 is well known to those skilled in the art, and they can choose the appropriate type as needed.

[0056] The drug cartridge can be contained within the focusing tube 1.

[0057] In the initial state, the positioning arm 2 is in a state of relying on the outer wall of the shaped charge tube 1, which makes it easy to insert the shaped charge tube 1 into the borehole 17.

[0058] The pusher 3 moves along the axial direction of the shaped charge tube 1. When the pusher 3 abuts against the positioning arm 2 and applies force to the positioning arm 2, the positioning arm 2 can be pushed to rotate away from the shaped charge tube 1. At this time, the positioning arm 2 abuts against the inner wall of the borehole, and the shaped charge tube 1 is fixed inside the borehole 17.

[0059] Before the energy-concentrating tube 1 is fixed, the orientation of the energy-concentrating groove of the energy-concentrating tube 1 can be adjusted so that after the energy-concentrating tube 1 is fixed, the orientation of the energy-concentrating groove is also fixed, thus ensuring the light burst effect.

[0060] In this embodiment, two positioning components can be provided, which can be respectively located on both sides of the energy-concentrating tube 1, with the energy-concentrating slot located between the two positioning components. For example, the positioning components can be located on the upper and lower sides of the energy-concentrating tube 1, while the energy-concentrating slot can be located on the left and right sides of the energy-concentrating tube 1.

[0061] In some embodiments, the positioning arm 2 includes a plurality of arm sections 4, which are rotatably connected to each other. The end arm section 4 is rotatably connected to the energy-concentrating tube 1. Along the rotation axis of the arm section 4, drive arms 5 are rotatably arranged on both sides of the arm section 4. The rotation axis of the drive arms 5 is perpendicular to the rotation axis of the arm section 4. The drive arms 5 are provided with airbags 6. The arm section 4 is configured such that when the drive arms 5 on both sides of the arm section 4 are closed, the two adjacent arm sections 4 are unlocked and the airbags 6 are compressed and deformed. When the drive arms 5 on both sides are separated, the two adjacent arm sections 4 are locked.

[0062] When the drive arm 5 is separated, the two adjacent arm sections 4 are locked, meaning that the two arm sections 4 cannot rotate.

[0063] When the drive arm 5 closes, the two adjacent arm segments 4 are unlocked, and at this time the two adjacent arm segments 4 are locked.

[0064] In the initial state, all the drive arms 5 of the arm segments 4 can be in a separated state, and the positioning arm 2 is a whole that cannot be deformed.

[0065] Because the inner diameter of the borehole 17 is not constant when blasting different rock masses, for boreholes 17 with larger inner diameters, the positioning arm 2 has sufficient space to rotate and open, abutting against the inner wall of the borehole to position the shaped charge tube 1. However, for boreholes 17 with smaller inner diameters, the gap between the positioning arm 2 and the borehole 17 is too small, making it difficult for the positioning arm 2 to rotate and open sufficiently. By selecting a suitable drive arm 5 of the arm segment 4 for a closing operation, the positioning arm 2 is divided into two segments, forming an L-shaped structure. This effectively reduces the radius of rotation of the positioning arm 2 relative to the shaped charge tube 1, allowing the positioning assembly to be applied to boreholes 17 with different inner diameters.

[0066] Furthermore, of the two positioning arms 2, the section furthest from the shaped charge tube 1 rests against the inner wall of the borehole, effectively increasing the contact area between the positioning arm 2 and the borehole wall, thereby enhancing the support effect of the positioning arm 2 on the shaped charge tube 1. At this time, the drive arm 5 of the arm segment 4 can increase the contact area between the arm segment 4 and the borehole wall, further enhancing the support effect of the positioning arm 2 on the shaped charge tube 1.

[0067] As the drive arm 5 of a certain arm segment 4 in the middle of the positioning arm 2 closes, the positioning arm 2 is in an L-shaped state. When the drive arm 5 closes, the airbags 6 of the two drive arms 5 are compressed and deformed. The airbags 6 are set on the inside of the bend of the positioning arm 2, and the positioning arm 2 can maintain its L-shaped state through the airbags 6. Furthermore, because the airbags 6 can deform, the part of the positioning arm 2 that abuts against the inner wall of the borehole can be tightly abutted against the inner wall of the borehole under the action of the airbags 6, further improving the support effect on the shaped charge tube 1.

[0068] In some embodiments, the drive arms 5 on both sides of the arm section 4 are respectively provided with hooks 10. When the drive arms 5 on both sides of the arm section 4 are closed, the hooks 10 of the drive arms 5 on both sides are engaged.

[0069] When the two drive arms 5 are closed, the hooks 10 on the two drive arms 5 can hook together. When the airbag 6 is compressed, it will exert a reaction force on the drive arms 5 to separate them. At this time, under the action of the airbag 6, the hooks 10 can remain in the hooked state, that is, the drive arms 5 can remain in the closed state.

[0070] In some embodiments, the arm section 4 includes two opposing limiting portions 11, one of which is located between the two limiting portions 11 of the other two adjacent arm sections 4. The limiting portion 11 is provided with a rotating shaft 12 and a positioning shaft 13. The arm section 4 is provided with a first shaft hole for accommodating the rotating shaft 12 and a second shaft hole for accommodating the positioning shaft 13. The positioning shaft 13 is movably connected to the limiting portion 11 along the rotation axis of the arm section 4. The positioning shaft 13 is configured to retract from the second shaft hole when the drive arm 5 is closed.

[0071] When the positioning shaft 13 is inserted into the second shaft hole, the two adjacent arm sections 4 cannot rotate. When the positioning shaft 13 is pulled out of the first shaft hole, the two arm sections 4 can rotate relative to each other under the action of the rotating shaft 12.

[0072] When the drive arms 5 on both sides of the arm section 4 close together, the drive arms 5 can drive the positioning shaft 13 to exit the second shaft hole, so that the two adjacent arm sections 4 can rotate.

[0073] In some embodiments, the drive arm 5 is provided with a cam portion 15, and the positioning shaft 13 is provided with a mating portion 16, with the cam portion 15 abutting against the mating portion 16.

[0074] When the drive arm 5 rotates, the cam part 15 can move the mating part 16, at which time the positioning shaft 13 can move in the direction of exiting the second shaft hole.

[0075] In this embodiment, a spring may be provided between the positioning shaft 13 and the limiting part 11. The spring is used to provide an elastic force that allows the positioning shaft 13 to remain inserted into the second shaft hole.

[0076] In some embodiments, the positioning assembly further includes a fixing part 14, a rotating part 9, and two connecting cables 7. The fixing part 14 is disposed on the energy-concentrating tube 1, and the rotating part 9 is rotatably disposed on the energy-concentrating tube 1. The fixing part 14 and the rotating part 9 are spaced apart along the axial direction of the energy-concentrating tube 1, and the rotation axis of the rotating part 9 is parallel to the axial direction of the energy-concentrating tube 1. One end of each connecting cable 7 is connected to the rotating part 9, and the other end is connected to the fixing part 14. The pushing part 3 is provided with two threading holes 8, and the connecting cables 7 pass through the threading holes 8.

[0077] Under the action of the rotating part 9 and the fixing part 14, the two connecting cables 7 are arranged in parallel and spaced apart. The connecting cables 7 are passed through the wire hole 8 of the pushing part 3, so that the pushing part 3 can be movably connected to the energy-concentrating tube 1.

[0078] Although the movement accuracy of the jacking part 3 is relatively low, the jacking part 3 only serves to push the jacking arm to rotate, so the movement accuracy requirement of this application is not high, and therefore it can fully meet the requirements.

[0079] The advantage of this design is that the connecting cable 7 occupies very little space, eliminating the need for slide rails or grooves on the outer wall of the shaped charge tube 1 to allow the jacking part 3 to be movably connected. This reduces the risk of increasing the size of the shaped charge tube 1 due to the installation of slide rails or grooves. Furthermore, it is reliable in operation and suitable for use in dusty blasting environments.

[0080] When the rotating part 9 rotates, the portions of the two connecting cables 7 between the pushing part 3 and the rotating part 9 can be wound together. When the two connecting cables 7 are spirally wound, the sides of the two connecting cables 7 closest to the pushing part 3 tend to converge, allowing the pushing part 3 to be pushed away from the rotating part 9. This allows the pushing part 3 to be moved via the rotating part 9. On one hand, this design reduces the risk of the shaped charge tube 1 moving when it is fixed. On the other hand, it requires less operating space, making it suitable for use in the borehole 17. Specifically, when the shaped charge tube 1 is in the borehole 17, a rod-shaped tool can be inserted into the borehole 17 to rotate the rotating part 9. Furthermore, this creates a reduced-size structure, meaning the distance the pushing part 3 moves is less than the rotation stroke of the rotating part 9, achieving both labor-saving effect and improved accuracy in driving the pushing part 3.

[0081] Furthermore, when the connecting cable 7 is spirally wound, the connecting cable 7 is tightened, which is equivalent to forming a lateral support for the energy-concentrating tube 1, which can improve the overall rigidity of the energy-concentrating tube 1 and make the energy-concentrating tube 1 less prone to torsion and sagging deformation.

[0082] At this time, the pusher 3 abuts against the positioning arm 2, which can prevent the connecting cable 7 from being over-wound and the risk of applying too much force to the energy-concentrating tube 1.

[0083] In this embodiment, the energy-concentrating tube 1 may be provided with a locking structure to unlock or lock the rotating part 9.

[0084] In some embodiments, the connecting cable 7 includes a metal segment connected to the rotating part 9.

[0085] The advantages of setting up the metal segment are twofold: firstly, it increases the structural strength of the connecting cable 7; secondly, when the rotating part 9 is rotated, the metal segment can remain wound, so that the energy-concentrating tube 1 does not need to be equipped with a locking structure to keep the pushing part 3 against the positioning arm 2.

[0086] The above embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any modifications, alterations, alterations, or substitutions made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A structure for loading explosive charges, characterized in that, It includes multiple explosive charges, which are housed in boreholes (17), and are configured to be longitudinally unspaced and to be laterally decoupled.

2. The blasting device according to claim 1, characterized in that, The explosive cartridge uses low-density explosives.

3. A blasting method, characterized in that, include: Select a smooth blasting explosive that matches the detonation velocity based on the hardness of the rock to be blasted. Drill blast holes in the rock mass (17). The special explosive is continuously loaded into the borehole (17) by adopting a transversely decoupled and longitudinally continuous charging structure, with no longitudinal gap between the explosive rolls and a radial gap between the borehole (17) and the explosive roll. Detonation operation.

4. A blasting device, comprising a shaped charge tube (1), characterized in that, It also includes a positioning component, the positioning component comprising: The positioning arm (2) is rotatably mounted on the energy-concentrating tube (1), and the rotation axis of the positioning arm (2) is perpendicular to the axial direction of the energy-concentrating tube (1). The pusher (3) is movably connected to the energy-concentrating tube (1) along the axial direction of the energy-concentrating tube (1), and the pusher (3) is used to push the positioning arm (2) to rotate.

5. The blasting device according to claim 4, characterized in that, The positioning arm (2) includes multiple arm sections (4), which are rotatably connected to each other. The end arm section (4) is rotatably connected to the energy-concentrating tube (1). Along the rotation axis of the arm section (4), drive arms (5) are rotatably provided on both sides of the arm section (4). The rotation axis of the drive arm (5) is perpendicular to the rotation axis of the arm section (4). The drive arm (5) is provided with an airbag (6). The arm section (4) is configured such that when the drive arms (5) on both sides of the arm section (4) are closed, the two adjacent arm sections (4) are unlocked and the airbag (6) is squeezed and deformed. When the drive arms (5) on both sides are separated, the two adjacent arm sections (4) are locked.

6. The blasting device according to claim 5, characterized in that, The drive arms (5) on both sides of the arm segment (4) are respectively provided with hooks (10). When the drive arms (5) on both sides of the arm segment (4) are closed, the hooks (10) of the drive arms (5) on both sides are hooked together.

7. The blasting device according to claim 5, characterized in that, The arm segment (4) includes two opposing limiting parts (11), one of which is located between the two limiting parts (11) of the other two adjacent arm segments (4). The limiting part (11) is provided with a rotating shaft (12) and a positioning shaft (13). The arm segment (4) is provided with a first shaft hole for accommodating the rotating shaft (12) and a second shaft hole for accommodating the positioning shaft (13). The positioning shaft (13) is movably connected to the limiting part (11) along the rotation axis of the arm segment (4). The positioning shaft (13) is configured to exit the second shaft hole when the drive arm (5) is closed.

8. The blasting device according to claim 7, characterized in that, The drive arm (5) is provided with a cam part (15), and the positioning shaft (13) is provided with a mating part (16), and the cam part (15) abuts against the mating part (16).

9. The blasting device according to claim 4, characterized in that, The positioning component also includes: The fixing part (14) is provided on the energy-concentrating tube (1); A rotating part (9) is rotatably disposed on the energy-concentrating tube (1). The fixed part (14) and the rotating part (9) are spaced apart along the axial direction of the energy-concentrating tube (1). The rotation axis of the rotating part (9) is parallel to the axial direction of the energy-concentrating tube (1). Two connecting cables (7) are provided, one end of which is connected to the rotating part (9) and the other end is connected to the fixing part (14). The pushing part (3) is provided with two threading holes (8), and the connecting cables (7) are threaded through the threading holes (8).

10. The blasting device according to claim 9, characterized in that, The connecting cable (7) includes a metal segment connected to the rotating part (9).

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