Electrostatic-free flammable adsorption material combustion excitation liquid oxygen phase change blasting device and method

Abstract

The invention provides a device and method for exciting liquid oxygen phase change blasting through combustion of a non-static flammable adsorbing material, the device comprises a flexible pipe cavity filled with liquid oxygen, a liquid filling pipe, a flammable medium and a grounding wire are arranged in the flexible pipe cavity, and the flexible pipe cavity is composed of a base material layer, a heat insulation layer and an anti-static layer. Static electricity is eliminated by arranging the grounding wire and the anti-static layer; the heat insulation layer is arranged to reduce heat loss; by using the combustible medium prepared from agricultural and forestry wastes, the cost is reduced, and resource reutilization is realized; and through the special design of the liquid filling pipe, the combustible medium quickly and uniformly absorbs liquid oxygen, and the rock breaking efficiency is improved. The problems of electrostatic potential safety hazards, poor heat insulation performance and high combustible medium cost in an existing liquid oxygen blasting technology are solved, and the method has the comprehensive advantages of being safe, efficient, economical and environmentally friendly.

Description

Technical Field

[0001] The present invention relates to the field of blasting, and specifically to a combustion-excited liquid oxygen phase change blasting device and method using a static-free flammable adsorption material. Background Art

[0002] In recent years, with the enhancement of people's safety awareness and environmental protection awareness, people have paid increasing attention to the hazards caused by blasting. Although traditional explosive blasting is widely used, problems such as environmental pollution, safety hazards, and the complexity of subsequent treatment have become increasingly prominent. In this context, non-explosive blasting technology, as an innovative and environmentally friendly blasting method, has emerged and gradually received attention and favor in the industry. Liquid oxygen blasting, as a type of non-explosive blasting technology, is widely used due to its high safety, low cost, and environmental friendliness.

[0003] Liquid oxygen blasting mainly utilizes the characteristics of liquid oxygen having "combustion-supporting + phase change". After the liquid oxygen is encapsulated in the energy storage tube, the built-in combustible medium is quickly and violently burned after being ignited by the ignition element, generating high temperature in the blast hole. The liquid oxygen in the energy storage tube undergoes a phase change after being excited by the high temperature, instantly changing from a liquid state to a gaseous state, and the volume instantly expands, generating high-pressure gas in the blast hole to act on the rock surface, forming stress waves and shear forces. The stress waves propagate inside the rock and generate a complex stress field, causing cracks and fragmentation inside the rock, while the shear forces directly act on the rock surface, causing peeling and fragmentation, achieving the effect of rock breaking.

[0004] Since the detonation temperature of liquid oxygen is relatively low, the excitation of liquid oxygen is crucial in liquid oxygen blasting technology. However, the current excitation methods have the following disadvantages in practical applications: 1. During the filling process of liquid oxygen, a large amount of static electricity will be generated due to various factors, which may cause premature detonation; 2. The heat insulation performance of the energy storage tube is poor, resulting in serious vaporization of liquid oxygen and affecting the blasting effect; 3. The combustible medium mostly uses paper rolls and cotton, with a relatively high cost, low energy density, and waste of resources.

[0005] Patent CN219890293U discloses a portable gas expansion rock breaking device, which can reduce the generation of static electricity by using anti-static PVC plastic pipes and increase the safety of on-site operations; Patent CN119043097A discloses a liquid oxygen gas explosion system and working method, which uses a special paper core made from waste materials such as recycled waste paper, crop straws, and branches trimmed from landscaping as the combustible to trigger the phase change of liquid oxygen to achieve rock fragmentation, reducing the process cost of liquid oxygen gas explosion; Patent CN219912654U discloses a liquid oxygen adiabatic storage tank, which can ensure the heat insulation of the liquid oxygen adiabatic storage tank by setting a heat insulation layer so that the liquid oxygen adiabatic storage tank is not affected by the outside temperature. However, the above patents do not take into account the problems of liquid oxygen blasting technology in terms of heat insulation effect, anti-static effect, and manufacturing cost, which is not conducive to popularization and application.

[0006] In view of this, it is of great significance to provide a liquid oxygen blasting device that takes into account heat insulation performance, anti-static performance, and manufacturing cost. Summary of the Invention

[0007] The main object of the present invention is to provide a liquid oxygen phase change blasting device and method that uses a non-static flammable adsorption material combustion to excite the phase change of liquid oxygen, and solves the technical problems of poor heat insulation effect, poor anti-static effect, and high liquid oxygen phase change cost in existing liquid oxygen rock-breaking devices.

[0008] To solve the above technical problems, the technical solution adopted by the present invention is: A liquid oxygen phase change blasting device that uses a non-static flammable adsorption material combustion to excite the phase change of liquid oxygen, including a flexible tube cavity filled with liquid oxygen, and an liquid filling tube, a combustible medium, and a grounding wire are arranged inside the flexible tube cavity. The liquid filling tube is fixed at the center of the top of the flexible tube cavity, one end extends into the lower part of the flexible tube cavity, and the other end is connected to an external liquid oxygen tank through a one-way valve for transporting liquid oxygen. An ignition element is arranged in the combustible medium, and the ignition element is connected to an external excitation controller through a wire for igniting the combustible medium. One end of the grounding wire is fixed at the top of the flexible tube cavity, extends into the flexible tube cavity and is connected to the liquid filling tube and the flexible tube cavity, and the other end is grounded for electrostatic protection.

[0009] Optionally, the flexible tube cavity sequentially includes a base material layer, a heat insulation layer, and an anti-static layer from the outside to the inside.

[0010] Optionally, the base material layer of the flexible tube cavity is one of HDPE, PEX, PVC, EPDM, and PA hoses.

[0011] Optionally, the heat insulation layer material is at least one of low-density polyethylene coating and nano-aerogel, and the anti-static layer material is a polymer permanent antistatic agent, including one of polyaniline, polypyrrole, polythiophene, and their derivatives.

[0012] Optionally, the grounding wire extends into the flexible tube cavity and is welded to the outer wall of the liquid filling tube and the inner wall anti-static layer of the flexible tube cavity to reduce the static electricity risk and improve the safety during liquid oxygen filling. In the present invention, through the design of the grounding wire and the anti-static layer, static electricity is eliminated, early detonation caused by static electricity is avoided, and the safety of on-site operation is increased; by setting a heat insulation layer, heat dissipation is reduced, the liquid oxygen phase change efficiency is improved, and the liquid oxygen phase change efficiency ≥ 95%.

[0013] Optionally, the liquid filling tube is an aluminum circular hose, and a plurality of liquid oxygen infiltration outlets are arranged on the tube wall to enable the combustible medium to quickly and uniformly absorb liquid oxygen and improve the rock-breaking efficiency.

[0014] Optionally, the flexible lumen is respectively provided with a top sealing plug and a bottom sealing plug. The bottom sealing plug is a solid structure. The top sealing plug is fixedly connected to a grounding wire, and an exhaust pipe is provided on one side close to the side wall for discharging excess gas.

[0015] Optionally, the combustible medium includes a disc-shaped solid unit with a plurality of central round holes.

[0016] Optionally, the outer diameter of the solid unit of the combustible medium is smaller than the inner diameter of the flexible lumen, and the diameter of the central round hole is slightly larger than the outer diameter of the liquid filling pipe. The liquid filling pipe passes through the central round hole of the combustible medium and extends into the bottom of the combustible medium, facilitating the combustible medium to fully absorb liquid oxygen.

[0017] Optionally, the outside of the combustible medium is coated with a plastic film, and its material is one of a cellulose-based film, a lignin-based composite film, or a starch-based film, facilitating the ignition of the combustible medium.

[0018] Optionally, the combustible medium includes one or a combination of several agricultural and forestry wastes such as rice husks, straws, wood chips, sawdust, wood shavings, wood processing scraps, bagasse, leaves, peanut shells, coconut shells, and palm shells; the preparation method is as follows: after drying the agricultural and forestry wastes, they are pressed into a disc-shaped solid unit with a round hole in the center.

[0019] By adopting the combustible medium made of agricultural and forestry wastes, the present invention not only greatly reduces the production cost of the device, but also realizes the resource utilization of agricultural and forestry wastes, having important economic benefits.

[0020] On the other hand, the present invention also provides a method for burning and exciting the phase change of liquid oxygen by an electrostatic-free flammable adsorption material, adopting the above-mentioned electrostatic-free flammable adsorption material combustion and excitation liquid oxygen phase change blasting device, including the following steps: S1. Drill a blast hole on the rock surface and vertically place the assembled flexible lumen into the blast hole; S2. Fill the flexible lumen with liquid oxygen until the combustible medium is fully infiltrated; S3. Start the external excitation controller to ignite the combustible medium. The combustible medium burns and releases heat under the action of liquid oxygen, and the liquid oxygen undergoes a phase change to form high-pressure gas to impact the rock, realizing rock fragmentation.

[0021] The present invention has the following beneficial effects: The present invention is made by setting the heat insulation layer as a low-density polyethylene coating to improve the heat insulation effect of the flexible lumen; setting the grounding wire and the anti-static layer as a polymer permanent anti-static agent to improve the anti-static effect of the flexible lumen; using the combustible medium made of agricultural and forestry waste, which not only reduces the production cost of the device, but also realizes the resource utilization of agricultural and forestry waste; by arranging a plurality of liquid oxygen infiltration ports outside the liquid filling pipe, the liquid oxygen and the combustible medium are fully contacted to improve the rock breaking efficiency. The blasting device of the present invention has the advantages of good heat insulation effect, good anti-static effect, low process cost and high rock breaking efficiency. Brief Description of the Drawings

[0022] The present invention will be further described below with reference to the accompanying drawings: Figure 1 It is a schematic structural diagram of a non-static flammable adsorption material combustion-excited liquid oxygen phase change blasting device of the present invention; Figure 2 It is a schematic structural diagram of the flexible lumen in Embodiment 1 of the present invention; Figure 3 It is a schematic structural diagram of the flexible lumen in Embodiment 2 of the present invention; In the figure: 1. Flexible lumen; 2. Combustible medium; 201. Solid unit; 3. Liquid filling pipe; 4. Ignition element; 5. Wire; 6. Liquid oxygen infiltration outlet; 7. Bottom sealing plug; 8. Top sealing plug; 9. Exhaust pipe; 10. Grounding wire; 11. Check valve; 12. Substrate layer; 13. First heat insulation layer; 14. Anti-static layer; 15. Second heat insulation layer; 16. Third heat insulation layer. Specific Embodiments

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] Embodiment 1: As Figure 1-2As shown in the figure, a combustion-excited liquid oxygen phase change blasting device for a static-free flammable adsorption material of the present invention includes a flexible tube cavity 1 filled with liquid oxygen. An infusion tube 3, a combustible medium 2, and a grounding wire 10 are arranged inside the flexible tube cavity. The infusion tube 3 is fixed at the center of the top of the flexible tube cavity 1, with one end extending into the lower part of the flexible tube cavity 1 and the other end connected to an external liquid oxygen tank through a one-way valve 11 for transporting liquid oxygen. An ignition element 4 is arranged in the combustible medium 2, and the ignition element 4 is connected to an external excitation controller through a wire 5 for igniting the combustible medium. One end of the grounding wire 10 is fixed at the top of the flexible tube cavity 1 and extends into the flexible tube cavity 1 to be connected to the infusion tube 3 and the flexible tube cavity 1, and the other end is grounded for preventing static electricity.

[0025] In a preferred solution, the grounding wire 10 is welded to the anti-static layer 14 on the outer wall of the infusion tube 3 and the inner wall of the tube cavity 1, avoiding the formation of high voltage and potential difference due to static electricity accumulation during the liquid oxygen filling process, thereby preventing the spark generated by static electricity discharge from igniting the combustible medium and causing an explosion. Moreover, the welded connection has good mechanical stability, maintaining the reliable operation of the grounding system, reducing the static electricity risk, and ensuring safety during liquid oxygen filling.

[0026] In the present invention, the flexible tube cavity 1 is made of rubber or plastic material, can be cut, and has a certain deformation ability.

[0027] In a preferred solution, the flexible tube cavity 1 sequentially includes a base material layer 12, a first heat insulation layer 13, and an anti-static layer 14 from outside to inside.

[0028] The base material layer 12 of the flexible tube cavity is one of HDPE, PEX, PVC, EPDM, and PA hoses.

[0029] The material of the first heat insulation layer 13 is low-density polyethylene coating, and the material of the anti-static layer 14 is the polymer permanent antistatic agent polypyrrole.

[0030] In the present invention, through the design of the grounding wire and the anti-static layer, static electricity is eliminated, avoiding premature detonation caused by static electricity and increasing the safety of on-site operations. By setting the heat insulation layer, heat loss is reduced, and the liquid oxygen phase change efficiency is improved, making the liquid oxygen phase change efficiency ≥ 95%.

[0031] In a preferred solution, the ignition elements are multiple groups, which are respectively arranged at the bottom, middle, and upper part of the combustible medium. During use, the ignition elements are controlled by an external excitation controller to start simultaneously, ensuring the full combustion of the combustible medium and generating a greater impact force.

[0032] In a preferred solution, the infusion tube 3 is an aluminum circular hose, and a plurality of liquid oxygen infiltration outlets 6 are arranged on the tube wall, and the infiltration outlets are spaced at a certain distance from each other, ensuring that the combustible medium 2 quickly and evenly absorbs liquid oxygen, improving the safety of liquid oxygen blasting and the rock-breaking efficiency.

[0033] In a preferred embodiment, the flexible lumen 1 is respectively provided with a top sealing plug 8 and a bottom sealing plug 7. The bottom sealing plug 7 is of a solid structure and has a gap with the bottom of the liquid filling pipe, forming a cavity for temporarily storing liquid oxygen. The top sealing plug 8 is fixedly connected to the grounding wire 10, and an exhaust pipe 9 is provided on one side close to the side wall for discharging excess gas.

[0034] In a preferred embodiment, the combustible medium 2 includes disc-shaped solid units 201 with a plurality of central circular holes, and a plastic film is arranged outside the disc-shaped solid units. The plastic film is one of a cellulose-based film, a lignin-based composite film, or a starch-based film, and is used to maintain the flammability of the combustible medium.

[0035] The outer diameter of the combustible medium solid unit 201 is smaller than the inner diameter of the flexible lumen 1, and the diameter of the central circular hole is slightly larger than the outer diameter of the liquid filling pipe. The liquid filling pipe 3 passes through the central circular hole of the combustible medium and extends to the bottom of the combustible medium 2.

[0036] In a preferred embodiment, the combustible medium 2 includes one or a combination of several agricultural and forestry wastes such as rice husks, straws, wood chips, sawdust, wood shavings, wood processing scraps, bagasse, leaves, peanut shells, coconut shells, palm shells, etc. The preparation method is as follows: After drying the agricultural and forestry wastes, they are pressed into disc-shaped solid units with circular holes in the center.

[0037] By adopting the combustible medium made of agricultural and forestry wastes, the present invention not only greatly reduces the production cost of the device, but also realizes the resource utilization of agricultural and forestry wastes.

[0038] Taking the rock breaking scenario in open-pit mines as an example, this embodiment provides a method for burning and exciting the phase change of liquid oxygen by an electrostatic-free flammable adsorption material, and uses the above-mentioned electrostatic-free flammable adsorption material combustion and excitation liquid oxygen phase change blasting device, including the following steps: S1. Drill a blast hole on the rock surface and vertically place the assembled flexible lumen 1 into the blast hole; Drill a blast hole with a diameter of 60 mm and a depth of 10.5 m on the rock surface, and reserve 0.5 m at the bottom of the hole as the buffer area for the bottom cavity of the flexible lumen 1. Vertically place the assembled flexible lumen 1 into the blast hole, make the top sealing plug 8 flush with the blast hole opening, and reliably connect the outside of the grounding wire 10 to the ground grounding stake (grounding resistance < 4 Ω) to eliminate the static electricity hazard.

[0039] S2. Inject liquid oxygen into the flexible lumen 1 until the combustible medium 2 is fully wetted; Open the valve of the liquid oxygen tank, inject liquid oxygen into the liquid filling pipe 3 at a pressure of 0.5 MPa through the oxygen injection pipe for 5 minutes until the combustible medium 2 in the flexible lumen is fully wetted. After the liquid oxygen injection is completed, close the one-way valve 11, remove the oxygen injection pipe, and wait for 10 minutes to make the liquid oxygen fully contact with the combustible medium 2.

[0040] S3. Start the external excitation controller to ignite the combustible medium 2. The combustible medium 2 burns under the action of liquid oxygen to release heat, which promotes the rapid phase change and vaporization of liquid oxygen, forming high-pressure gas to impact the rock and achieve rock fragmentation.

[0041] During the liquid oxygen excitation process, the antistatic layer 14 and the grounding wire 10 continuously conduct away static electricity, and the first heat insulation layer 13 reduces heat dissipation to ensure that the liquid oxygen phase change efficiency is ≥95%.

[0042] In this embodiment, a manufacturing method of the flexible lumen 1 is also provided, including the following steps: 1. Preparation of the flexible lumen 1 Use an HDPE hose with good wear resistance (outer diameter 50 mm, wall thickness 3 mm) as the flexible lumen 1, and determine the length (10 m) according to the depth of the blast hole; coat a low-density polyethylene coating (thickness 0.5 mm) on the lumen base layer as the heat insulation layer 13 to reduce the influence of external heat on liquid oxygen, and evenly spray a polymer permanent antistatic agent on the surface of the heat insulation layer to form the antistatic layer 14 to ensure that the inner wall of the lumen has antistatic performance.

[0043] 2. Preparation of the combustible medium 2 Use agricultural and forestry waste with rice husks and straw mixed in a mass ratio of 1:1. After drying, press it into a disc-shaped solid unit with a round hole in the center (outer diameter 48 mm, diameter of the central round hole 12 mm, thickness 40 mm), and its outer diameter is 10 mm smaller than the inner diameter of the flexible lumen, which is convenient for filling and liquid oxygen infiltration.

[0044] Wrap a layer of cellulose-based film (thickness 0.1 mm) outside each combustible medium unit. By coating the cellulose film, the flammability of the combustible medium is maintained.

[0045] 3. Assembly of the liquid filling pipe 3 and the grounding wire 10 The liquid filling pipe 3 uses an aluminum circular hose (outer diameter 10 mm, wall thickness 1 mm), and a number of liquid oxygen infiltration outlets 6 with a diameter of 4 mm are evenly opened on the pipe wall (the distance between each outlet is 10 mm) to ensure that the combustible medium can quickly and evenly absorb liquid oxygen.

[0046] The grounding wire 10 selects a multi-strand copper core wire (cross-sectional area 4 mm²). One end of it extends into the flexible lumen and is welded to the outer wall of the liquid filling pipe 3 and the antistatic layer 14 on the inner wall of the lumen, and the other end is grounded to prevent static electricity.

[0047] 4. Manufacture of the flexible lumen 1 (1) Insert the liquid filling pipe 3 into the flexible lumen 1 from the top and fix it through the central hole of the top sealing plug 8 (made of HDPE). Leave a 50 mm cavity between the lower end of the liquid filling pipe 3 and the bottom sealing plug 7 to avoid liquid oxygen deposition and blockage; (2) Fill the combustible medium 2 outside the liquid filling pipe 3 in sequence, making the central hole of the combustible medium fit tightly with the liquid filling pipe. There is a 1-mm gap between each combustible medium unit to facilitate the diffusion of liquid oxygen. (3) Embed ignition elements 4 in the upper, middle, and bottom parts of the combustible medium 2, and connect them to an external excitation controller through wires. (4) A one-way valve 11 is set on the top sealing plug 8 of the energy storage pipe, and it is connected to an external oxygen injection pipe through a low-temperature resistant hose to ensure the one-way injection of liquid oxygen. At the same time, an exhaust pipe 9 (with a diameter of 8 mm) is set to discharge the air in the pipe cavity. The bottom sealing plug 7 is of a solid structure and forms a liquid oxygen temporary storage area with the cavity reserved at the bottom of the liquid filling pipe 3.

[0048] Through the above steps, the assembly of the energy storage pipe is completed for subsequent rock breaking.

[0049] Embodiment 2: Further illustrate in combination with Embodiment 1. As Figure 3 shown, in this embodiment, the flexible lumen 1 sequentially includes a base material layer 12, a second heat insulation layer 15, a third heat insulation layer 16, and an antistatic layer 14 from outside to inside. The material of the second heat insulation layer 15 is low-density polyethylene coating, and the material of the third heat insulation layer 16 is nano-aerogel.

[0050] By setting a double-layer heat insulation layer, the outside heat is efficiently isolated, and further heat absorption of liquid oxygen during storage and use is reduced, making the liquid oxygen phase change efficiency ≥ 98%.

[0051] In this embodiment, the combustible medium 2 is an agricultural and forestry waste made by mixing sawdust, bagasse, and palm shells in a mass ratio of 1:1:1. After drying, it is pressed into a solid unit in the shape of a cake with a central round hole (outer diameter 48 mm, central hole diameter 12 mm, thickness 40 mm). Its outer diameter is 10 mm less than the inner diameter of the flexible lumen, which is convenient for filling and liquid oxygen infiltration.

[0052] In summary, for the combustion-excited liquid oxygen phase change device of the non-static flammable adsorption material of the present invention, by setting a combustible medium made of agricultural and forestry waste, a heat insulation layer made of low-density polyethylene coating and / or nano-aerogel, and an antistatic layer made of a polymer permanent antistatic agent, the technical problems of poor heat insulation effect and antistatic effect and high device cost of the existing liquid oxygen rock-breaking device are solved, and it has the comprehensive advantages of high efficiency, safety, economy, and environmental protection.

[0053] The above embodiments are only the preferred technical solutions of the present invention and should not be regarded as limitations on the present invention. The protection scope of the present invention should be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, the equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A combustion-excited liquid oxygen phase change blasting device for an electrostatic-free flammable adsorption material, characterized in that It includes a flexible lumen (1) filled with liquid oxygen. Inside the flexible lumen (1), there are a liquid filling pipe (3), a combustible medium (2), and a grounding wire (10). The liquid filling pipe (3) is fixed at the center of the top of the flexible lumen (1), with one end extending into the lower part of the flexible lumen (1) and the other end connected to an external liquid oxygen tank through a one-way valve (11) for transporting liquid oxygen. An ignition element (4) is arranged in the combustible medium (2). The ignition element (4) is connected to an external excitation controller through a wire (5) for igniting the combustible medium. One end of the grounding wire (10) is fixed at the top of the flexible lumen (1) and extends into the flexible lumen (1) to be connected to the liquid filling pipe (3) and the inner wall of the flexible lumen (1), and the other end is grounded for electrostatic protection.

2. The liquid oxygen phase change blasting device for combustion of the static-free flammable adsorption material according to claim 1, characterized in that, The flexible lumen (1) sequentially includes a base material layer (12), a heat insulation layer, and an anti-static layer (14) from outside to inside.

3. The oxygen phase change blasting device for combustion of the static-free flammable adsorption material according to claim 2, characterized in that The heat insulation layer is made of at least one of low-density polyethylene coating and nano-aerogel, and the anti-static layer (14) is made of a polymer permanent antistatic agent.

4. The static electricity-free flammable adsorption material combustion-excited liquid oxygen phase change blasting device according to claim 1, characterized in that The liquid filling pipe (3) is an aluminum circular flexible pipe, and multiple liquid oxygen infiltration outlets (6) are arranged on the pipe wall.

5. The liquid oxygen phase change blasting device for combustion of a static-free flammable adsorption material according to claim 1, characterized in that, The flexible lumen (1) is respectively provided with a top sealing plug (8) and a bottom sealing plug (7). The top sealing plug (8) is fixedly connected to the grounding wire (10), and an exhaust pipe (9) is arranged on one side close to the side wall for discharging excess gas.

6. The static-free flammable adsorption material combustion-excited liquid oxygen phase change blasting device according to claim 1, wherein The combustible medium (2) includes disc-shaped solid units (201) with multiple central round holes.

7. The static-free flammable adsorption material combustion-excited liquid oxygen phase change blasting device according to claim 1, characterized in that, The combustible medium (2) is one or a combination of several of agricultural and forestry waste such as rice husk, straw, wood chips, sawdust, shavings, wood processing scraps, bagasse, leaves, peanut shells, coconut shells, and palm shells.

8. The static-free flammable adsorption material combustion-excited liquid oxygen phase change blasting device according to claim 6, wherein, The outside of the combustible medium is coated with a plastic film, and its material is one of a cellulose-based film, a lignin-based composite film, or a starch-based film.

9. The static-free flammable adsorption material combustion-excited liquid oxygen phase change blasting device according to claim 6, wherein The outer diameter of the combustible medium solid unit (201) is smaller than the inner diameter of the flexible lumen (1), and the diameter of the central round hole is slightly larger than the outer diameter of the liquid filling pipe.

10. A method for combusting an electrostatic-free flammable adsorption material to stimulate the phase change of liquid oxygen, which uses the electrostatic-free flammable adsorption material combustion-stimulated liquid oxygen phase change blasting device described in any one of the above items 1-9, and is characterized in that, It includes the following steps: S1. Drill a blast hole on the rock surface and vertically place the assembled flexible lumen into the blast hole. S2. Fill the flexible lumen with liquid oxygen until the combustible medium is fully infiltrated. S3. Start the external excitation controller to ignite the combustible medium. The combustible medium burns under the action of liquid oxygen to release heat, prompting the liquid oxygen to quickly undergo a phase change and vaporize, forming high-pressure gas to impact the rock and realizing rock fragmentation.

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