A nitrogen-oxygen separation double-layer liquefied air rock-breaking device

Abstract

This utility model discloses a double-layer liquefied air rock-breaking device with nitrogen and oxygen separation, including an installation head, a flexible inner tube, a flexible outer tube, an oxygen injection tube, a nitrogen injection tube, a heating wire, and multiple adsorption units. The flexible inner and outer tubes are both flexible sleeves with open tops and closed bottoms. The inner diameter of the flexible outer tube is larger than the outer diameter of the flexible inner tube, and their openings are sealed to the outer periphery of the installation head. One end of the oxygen injection tube and the heating wire passes through the installation head and extends to the bottom of the flexible inner tube. The heating wire's outer end is connected to the detonator. One end of the nitrogen injection tube passes through the installation head and extends to the bottom of the flexible outer tube. The adsorption units are located inside the flexible inner tube, and multiple adsorption units are connected in series via the oxygen injection tube and the heating wire. This rock-breaking device can shorten the explosion activation time and reduce the heat required for detonation, improving the blasting effect, reducing rock-breaking costs, and improving blasting safety.

Description

Technical Field

[0001] This utility model belongs to the technical field of rock breaking devices, and more specifically, relates to a double-layer liquefied air rock breaking device with nitrogen and oxygen separation. Background Technology

[0002] In engineering fields such as mining, tunnel excavation, and rock breaking, rock breaking technology is one of the key processes. Traditional rock breaking methods mainly include blasting, hydraulic breaking, and laser breaking, but all have significant limitations. In recent years, liquefied air rock breaking technology has gradually gained attention due to its environmentally friendly and efficient characteristics. This technology involves filling a pipe with liquefied air (mainly liquid oxygen and liquid nitrogen), burying the pipe in a rock breaking hole, and using an electric heating device to heat the liquefied air, causing it to expand and generate high-pressure impacts that break the rock, thus achieving the effect of rock breaking.

[0003] Existing liquefied air (LIB) rock-breaking devices rely on electric heating to liquefy and ignite air for explosive detonation. This requires significant heat and demands high power from the detonator, while also exhibiting slow ignition speed. Furthermore, some devices currently fill the tube with combustible adsorbent material, using electric heating to ignite the material in the liquefied air, causing it to explode and release heat for rapid LIB explosion. However, ensuring effective explosion requires a high oxygen content in the liquefied air, increasing oxygen consumption, the risk of explosion, and the cost of rock breaking.

[0004] Therefore, there is an urgent need for a new type of rock-breaking device that can shorten the explosion activation time and reduce the heat required for device detonation, improve blasting effect, effectively reduce the amount of liquid oxygen and adsorbent materials used, reduce rock-breaking costs, and improve blasting safety. Summary of the Invention

[0005] To address the problems of slow activation and high consumption of liquid oxygen and adsorbent materials in existing rock-breaking devices, this invention provides a nitrogen-oxygen separation double-layer liquefied air rock-breaking device. During detonation, the double-layer liquefied air rock-breaking device utilizes the combustion-supporting effect of liquid oxygen to rapidly burn the adsorbent material, shortening the activation time of liquid nitrogen and reducing the heat required for device detonation, thereby improving the blasting effect.

[0006] To achieve the above objectives, this utility model provides a double-layer liquefied air rock-breaking device for nitrogen-oxygen separation, comprising a flexible inner tube and a flexible outer tube, both with their upper openings sealed to the outer periphery of an installation head. Both are flexible sleeves with open upper ends and closed lower ends. The inner diameter of the flexible outer tube is larger than the outer diameter of the flexible inner tube, allowing the flexible inner tube to be fitted inside the flexible outer tube. The flexible inner tube is filled with liquid oxygen, and the gap between the flexible outer tube and the flexible inner tube is filled with liquid nitrogen. An oxygen injection pipe, a nitrogen injection pipe, and a detonating head are sequentially arranged at the top of the installation head, with a heating wire connected to the bottom of the detonating head. One end of the oxygen injection pipe and the heating wire passes through the installation head and extends to the bottom of the flexible inner tube. One end of the nitrogen injection pipe passes through the installation head and extends to the bottom of the flexible outer tube. Multiple adsorption units are disposed within the flexible inner tube, and these units are connected in series via the oxygen injection pipe and the heating wire located within the flexible inner tube.

[0007] Furthermore, the mounting head is also provided with an oxygen injection exhaust pipe and a nitrogen injection exhaust pipe; the lower end of the oxygen injection exhaust pipe extends into the flexible inner pipe, and the lower end of the nitrogen injection exhaust pipe extends into the gap between the inner and outer walls of the flexible outer pipe and the outer wall of the flexible inner pipe.

[0008] Furthermore, the top of the oxygen injection pipe, nitrogen injection pipe, oxygen injection exhaust pipe, and nitrogen injection exhaust pipe are all equipped with sealing plugs.

[0009] Furthermore, the mounting head also includes a mounting neck at the bottom, the upper opening of the flexible inner tube is fixed to the mounting neck by a first locking clamp, and the upper opening of the flexible outer tube is fixed to the mounting head by a second locking clamp.

[0010] Furthermore, the adsorption unit includes a filling shell (i.e., a filling housing) and an adsorption filler. The filling shell is a hollow cylindrical box, and the adsorption filler is filled into the filling shell. The top and bottom of the filling shell are provided with through holes, through which the oxygen injection pipe and the heating wire pass.

[0011] Furthermore, a limiting cap is fixedly provided at the bottom of the oxygen injection tube, and the outer diameter of the limiting cap is larger than the inner diameter of the through hole.

[0012] Furthermore, the sidewall of the filling shell is also provided with liquid permeation holes.

[0013] Furthermore, the detonator is equipped with a detonation wire, which is connected to the detonation controller.

[0014] Furthermore, the mounting head is made of foam material, and both the flexible inner tube and the flexible outer tube are made of PE material. Overall, compared with the prior art, the above technical solution conceived by this utility model can achieve the following beneficial effects:

[0015] (1) The rock-breaking device of this utility model can flexibly mix liquid oxygen and liquid nitrogen, without the need to maintain a high oxygen content in liquefied air, which greatly reduces the amount of liquid oxygen required for detonation, and at the same time reduces the consumption of adsorbent materials (such as shredded paper and paper rolls), directly reducing the cost of raw materials; by using foam material installation head, PE material flexible inner tube and flexible outer tube, the material procurement cost is low; and the device can be quickly assembled on site without complex prefabrication process, reducing the cost investment in production and construction links; through the flexible inner tube and flexible outer tube of flexible structure to adapt to rock-breaking holes of different sizes, there is no need to customize special devices for specific scenarios, reducing the cost of equipment adaptation and replacement.

[0016] (2) The rock-breaking device of this utility model utilizes the strong combustion-supporting effect of liquid oxygen to rapidly ignite the filler (shredded paper / paper roll) in the adsorption unit. Compared with the traditional electric heating ignition method, it significantly shortens the ignition time of liquid nitrogen and improves the efficiency of rock-breaking operations. The large amount of heat released by the deflagration of the adsorption unit reduces the external heat input required for the device to ignite, eliminating the need to rely on a high-power detonator, reducing the performance requirements of the detonation equipment, and avoiding the problem of ignition delay caused by insufficient power. The liquid nitrogen instantly vaporizes and expands under the action of heat, generating a concentrated and strong high-pressure impact force that directly acts on the rock, making the rock-breaking effect more efficient and reducing the probability of repeated blasting.

[0017] (3) The rock-breaking device of this utility model achieves physical isolation between liquid oxygen and liquid nitrogen through a double-layer tube structure: liquid oxygen is sealed in a flexible inner tube, and liquid nitrogen is filled in the gap between the inner and outer tubes, avoiding the safety risks caused by premature mixing of the two and reducing the risk of explosion from a structural perspective; equipped with an initiation controller and an initiation wire, it supports remote control of the initiation process, and the operator does not need to come into close contact with the rock-breaking hole, reducing the probability of personnel being exposed to the dangerous environment; the flexible inner tube and the flexible outer tube are soft in texture and are not easily damaged by collision or squeezing during transportation and installation, reducing the risk of liquid oxygen and liquid nitrogen leakage; the adsorption unit is fixed by a limiting cap to avoid structural failure caused by falling off during assembly or transportation.

[0018] (4) The rock-breaking device of this utility model can fully assist the combustion of the packing in the adsorption unit by liquid oxygen, so that the packing can burn more completely, reducing the emission of harmful gases such as carbon monoxide caused by incomplete combustion, and reducing the pollution of the surrounding air environment caused by rock-breaking operations; the device does not require the use of explosives or toxic chemical agents in traditional blasting, and there are no toxic residues in the rock-breaking process, reducing the pollution to soil and groundwater, which meets the development needs of green mines and environmentally friendly tunnel excavation; at the same time, the adsorption packing uses biodegradable materials such as shredded paper and paper rolls, and even if there are a small amount of residue, it can be naturally degraded and will not cause long-term environmental burden. Attached Figure Description

[0019] Figure 1 This is a front view of the overall structure of a nitrogen-oxygen separation double-layer liquefied air rock-breaking device according to an embodiment of the present invention;

[0020] Figure 2 This is a cross-sectional view of a nitrogen-oxygen separation double-layer liquefied air rock-breaking device according to an embodiment of the present invention;

[0021] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0022] Figure 4 This is a cross-sectional view of the adsorption unit in an embodiment of the present invention.

[0023] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 100-installation head, 101-installation neck, 200-flexible inner tube, 201-first locking clamp, 300-flexible outer tube, 301-second locking clamp, 400-oxygen injection pipe, 401-oxygen injection exhaust pipe, 402-limiting cap, 500-nitrogen injection pipe, 501-nitrogen injection exhaust pipe, 600-detonating head, 601-heating wire, 700-adsorption unit, 701-filling shell, 702-through hole, 703-liquid permeation hole, 800-adsorption packing. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model. Furthermore, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0025] like Figure 1-4As shown, this utility model provides a double-layer liquefied air rock-breaking device for nitrogen and oxygen separation, including an installation head 100, a flexible inner tube 200, a flexible outer tube 300, an oxygen injection tube 400, a nitrogen injection tube 500, a heating wire 601, and multiple adsorption units 700. Both the flexible inner tube 200 and the flexible outer tube 300 are flexible sleeves with open tops and closed bottoms. The inner diameter of the flexible outer tube 300 is larger than the outer diameter of the flexible inner tube 200. The openings of both are sealed to the outer periphery of the mounting head 100. One end of the oxygen injection tube 400 and the heating wire 601 passes through the mounting head 100 and extends to the bottom of the flexible inner tube 200. The heating wire 601 is located outside the mounting head 100 and is connected to the detonator 600. One end of the nitrogen injection tube 500 passes through the mounting head 100 and extends to the bottom of the flexible outer tube 300. The adsorption unit 700 is located inside the flexible inner tube 200, and multiple adsorption units are connected in series through the oxygen injection tube 400 and the heating wire 601. This invention relates to a rock-breaking device that ignites an adsorption unit 700 containing liquid oxygen by heating a heating wire 601. This causes the adsorption unit 700 to undergo explosive combustion in the liquid oxygen, generating a large amount of heat that ignites the outer layer of liquid nitrogen. The liquid nitrogen then instantly vaporizes, expands, and explodes, thus achieving the effect of rock breaking. This rock-breaking device shortens the explosion activation time and reduces the heat required for detonation, improving the blasting effect. It also effectively reduces the amount of liquid oxygen and adsorption material used, lowering rock-breaking costs and improving blasting safety.

[0026] like Figure 1-2 As shown, both the flexible inner tube 200 and the flexible outer tube 300 are flexible sleeves with an open top and a closed bottom. The inner diameter of the flexible outer tube 300 is larger than the outer diameter of the flexible inner tube 200. In this embodiment, both the flexible inner tube 200 and the flexible outer tube 300 can be made of PE material.

[0027] The mounting head 100 has a cylindrical structure, and a mounting neck 101 is provided at the lower part of the mounting head 100. The mounting neck 101 and the mounting head 100 are an integrated structure. The mounting neck 101 and the mounting head 100 can be made of foam material. The mounting head 100 is provided with an oxygen injection pipe 400, a nitrogen injection pipe 500 and an initiator head 600. An ignition wire is connected to the initiator head 600. The oxygen injection pipe 400, the nitrogen injection pipe 500 and the ignition wire all pass through the mounting head 100. The mounting head 100 is used to fix the oxygen injection pipe 400, the nitrogen injection pipe 500 and the initiator head 600.

[0028] The oxygen injection tube 400 and the ignition wire are connected in series and pass through multiple adsorption units 700. The adsorption units 700 are made of combustible material. The flexible inner tube 200 is fitted over the adsorption unit 700, and its upper opening is sealed and fixed to the mounting head 100. The flexible outer tube 300 is fitted over the flexible inner tube 200, and its upper opening is sealed and fixed to the mounting head 100. Specifically, the upper opening of the flexible inner tube 200 is fixed to the mounting neck 101 by a first locking clamp 201, and the upper opening of the flexible outer tube 300 is fixed to the mounting head 100 by a second locking clamp 301. The first locking clamp 201 and the second locking clamp 301 can be either a band structure or adhesive tape.

[0029] The nitrogen injection tube 500 extends to the bottom of the gap between the inner and outer walls of the flexible outer tube 300 and the outer wall of the flexible inner tube 200. The oxygen injection tube 400 is used to inject liquid oxygen into the flexible inner tube 200, filling it completely. The nitrogen injection tube 500 is used to inject liquid nitrogen into the flexible outer tube 300, filling the gap between the inner and outer walls of the flexible outer tube 300 and the outer wall of the flexible inner tube 200. The detonator 600 is equipped with a detonation wire, which is connected to a detonation controller (not shown in the figure). The detonation controller controls the heating wire 601 of the detonator 600 to ignite the adsorption unit 700 in the liquid oxygen environment.

[0030] In a preferred embodiment, the mounting head 100 is further provided with an oxygen injection exhaust pipe 401 and a nitrogen injection exhaust pipe 501. The upper end of the oxygen injection exhaust pipe 401 is an oxygen injection exhaust port, and the upper end of the nitrogen injection exhaust pipe 501 is a nitrogen injection exhaust port. The lower end of the oxygen injection exhaust pipe 401 extends into the flexible inner tube 200, and the lower end of the nitrogen injection exhaust pipe 501 extends into the gap between the inner and outer walls of the flexible outer tube 300 and the outer wall of the flexible inner tube 200. The oxygen injection exhaust pipe 401 and the nitrogen injection exhaust pipe 501 are used to discharge air from the flexible inner tube 200 and the flexible outer tube 300, facilitating the injection of liquid oxygen and liquid nitrogen. The tops of the oxygen injection pipe 400, the nitrogen injection pipe 500, the oxygen injection exhaust pipe 401, and the nitrogen injection exhaust pipe 501 are all provided with sealing plugs, which are used to seal the oxygen injection pipe 400, the nitrogen injection pipe 500, the oxygen injection exhaust pipe 401, and the nitrogen injection exhaust pipe 501 after the injection of liquid oxygen and liquid nitrogen.

[0031] In a preferred embodiment, the adsorption unit 700 includes a filling shell 701 and an adsorption filler 800. The filling shell 701 is a hollow cylindrical box, and the adsorption filler 800 is filled into the filling shell 701. The filling shell 701 has through holes 702 at both its top and bottom, through which the oxygen injection pipe 400 and the ignition wire pass. The adsorption filler 800 can be shredded paper or a paper roll, and the filling shell 701 can be a cardboard box. The adsorption filler 800 can adsorb liquid oxygen, which can be rapidly ignited after being heated by the ignition wire, thus causing a combustion explosion in a liquid oxygen environment. The side wall of the filling shell 701 is also provided with liquid permeation holes 703, which ensure that liquid oxygen can quickly enter the filling shell 701, allowing the adsorption filler 800 to fully adsorb liquid oxygen.

[0032] In a preferred embodiment, a limiting cap 402 is fixedly provided at the bottom of the oxygen injection tube 400, and the outer diameter of the limiting cap 402 is larger than the inner diameter of the through hole 702. The limiting cap 402 is used to prevent the adsorption unit 700 from falling off the oxygen injection tube 400.

[0033] This utility model discloses a double-layer liquefied air rock-breaking device for nitrogen and oxygen separation, which can be assembled on-site before blasting. The assembly process is as follows: First, multiple adsorption units 700 are connected in series to the oxygen injection pipe 400; then, all adsorption units 700 are fitted onto the flexible inner tube 200, and the upper end of the flexible inner tube 200 is secured to the mounting neck 101 using the first locking clamp 201; finally, the flexible outer tube 300 is fitted onto the flexible inner tube 200 and the nitrogen injection pipe 500, and the upper end of the flexible inner tube 200 is secured to the mounting head 100 using the second locking clamp 301; finally, the nitrogen injection pipe 500 is fitted onto the flexible inner tube 200 and the nitrogen injection pipe 500; then, the nitrogen injection pipe 500 is secured to the mounting head 100 using the second locking clamp 301; finally, the nitrogen injection pipe 500 is secured to the mounting neck 100. Liquid oxygen is injected into the flexible inner tube 200 through the oxygen pipe 400 until the flexible inner tube 200 is filled with liquid oxygen. Liquid nitrogen is then injected into the gap between the inner and outer walls of the flexible outer tube 300 and the outer wall of the flexible inner tube 200 through the nitrogen injection pipe 500. The oxygen injection exhaust pipe 401 and the nitrogen injection exhaust pipe 501 are used to discharge the air in the flexible inner tube 200 and the flexible outer tube 300. After the liquid oxygen and liquid nitrogen are filled, the top of the nitrogen injection pipe 500, oxygen injection pipe 400, oxygen injection exhaust pipe 401, and nitrogen injection exhaust pipe 501 are sealed with a sealing plug, thus completing the on-site assembly of the double-layer liquefied air rock breaking device.

[0034] The present invention discloses a double-layer liquefied air rock-breaking device for nitrogen-oxygen separation. The blasting process is as follows: the assembled double-layer liquefied air rock-breaking device is placed into a pre-drilled rock-breaking hole, and the upper end of the rock-breaking hole is sealed with filling material (such as soil or gravel); the detonation controller controls the heating wire 601 connected to the detonation head 600 to heat up. When the temperature of the heating wire 601 rises to a certain value, it ignites the adsorption unit 700 that adsorbs liquid oxygen, causing the adsorption unit 700 to undergo deflagration in the liquid oxygen, generating a large amount of heat, which excites the liquid nitrogen located in the outer layer, causing the liquid nitrogen to vaporize and expand instantaneously and explode, thereby achieving the effect of rock breaking.

[0035] The device's inner and outer tubes are made of flexible materials, facilitating transportation and on-site assembly, and offering advantages in flexible and safe use. During detonation, the device utilizes the combustion-supporting effect of liquid oxygen to rapidly burn the adsorbent material, shortening the activation time of liquid nitrogen and reducing the heat required for detonation, thus improving the blasting effect. The device allows for layered loading of liquid oxygen and liquid nitrogen, with the liquid nitrogen and adsorption unit 700 enclosed within the flexible inner tube 200. During blasting, this achieves the effects of liquid oxygen supporting combustion and releasing heat, and liquid nitrogen expanding and blasting. This rock-breaking device allows for more flexible proportions of liquid oxygen and liquid nitrogen, significantly reducing the amount of liquid oxygen and adsorbent material required for detonation, thereby lowering rock-breaking costs and improving blasting safety. Furthermore, liquid oxygen provides sufficient combustion support during detonation, reducing carbon monoxide production during the combustion of adsorption unit 700 and minimizing rock-breaking pollution.

[0036] This utility model's rock-breaking device allows for flexible mixing of liquid oxygen and liquid nitrogen, eliminating the need to maintain high-oxygen-content liquefied air, significantly reducing the amount of liquid oxygen required for detonation, and simultaneously reducing the consumption of adsorbent materials (such as shredded paper and paper rolls), directly cutting raw material costs. By using a foam-material mounting head and flexible PE inner and outer tubes, material procurement costs are low. Furthermore, the device can be quickly assembled on-site without complex prefabrication processes, reducing production and construction costs. The flexible inner and outer tubes adapt to rock-breaking holes of different sizes, eliminating the need for customized devices for specific scenarios, reducing equipment adaptation and replacement costs.

[0037] This novel rock-breaking device utilizes the powerful combustion-supporting effect of liquid oxygen to rapidly ignite the packing material (shredded paper / paper rolls) in the adsorption unit. Compared to traditional electric heating ignition methods, this significantly shortens the ignition time of liquid nitrogen and improves rock-breaking efficiency. The large amount of heat released by the deflagration of the adsorption unit reduces the external heat input required for device ignition, eliminating the need for a high-power detonator and lowering the performance requirements of the detonation equipment. It also avoids the ignition delay problem caused by insufficient power. The instantaneous vaporization and expansion of liquid nitrogen under heat generates a concentrated and powerful high-pressure impact force that directly acts on the rock, resulting in more efficient rock-breaking and reducing the probability of repeated blasting.

[0038] This utility model's rock-breaking device achieves physical isolation between liquid oxygen and liquid nitrogen through a double-layer tube structure: liquid oxygen is sealed within a flexible inner tube, while liquid nitrogen fills the gap between the inner and outer tubes, preventing premature mixing and thus reducing the risk of explosion. Equipped with an initiation controller and initiation wire, it supports remote control of the initiation process, eliminating the need for operators to have close contact with the rock-breaking hole and reducing the probability of personnel exposure to hazardous environments. The flexible inner and outer tubes are soft and not easily damaged by collisions or compression during transportation and installation, reducing the risk of liquid oxygen and liquid nitrogen leakage. The adsorption unit is fixed with a limiting cap to prevent structural failure caused by detachment during assembly or transportation.

[0039] This utility model's rock-breaking device utilizes liquid oxygen to fully combust the packing material in the adsorption unit, resulting in more complete combustion and reducing emissions of harmful gases such as carbon monoxide caused by incomplete combustion. This reduces the pollution of the surrounding air environment caused by rock-breaking operations. The device eliminates the need for explosives or toxic chemicals used in traditional blasting, leaving no toxic residues during the rock-breaking process and reducing pollution to soil and groundwater. This aligns with the development needs of green mining and environmentally friendly tunnel excavation. Furthermore, the adsorption packing material is made of biodegradable materials such as shredded paper and paper rolls, ensuring that even if a small amount remains, it will naturally degrade and will not cause long-term environmental burden.

[0040] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A double-layer liquefied air rock-breaking device for nitrogen and oxygen separation, characterized in that, include: Mounting head (100); The upper openings of the flexible inner tube (200) and the flexible outer tube (300) are respectively sealed and connected to the outer periphery of the mounting head (100). Both are flexible sleeves with an upper opening and a lower closing. The inner diameter of the flexible outer tube (300) is larger than the outer diameter of the flexible inner tube (200), so that the flexible inner tube (200) is fitted inside the flexible outer tube (300). The flexible inner tube (200) is filled with liquid oxygen, and the gap between the flexible outer tube (300) and the flexible inner tube (200) is filled with liquid nitrogen. An oxygen injection pipe (400), a nitrogen injection pipe (500), and a detonator (600) are sequentially disposed on the top of the mounting head (100). A heating wire (601) is connected to the bottom of the detonator (600). One end of the oxygen injection pipe (400) and the heating wire (601) passes through the mounting head (100) and extends to the bottom of the flexible inner tube (200). One end of the nitrogen injection pipe (500) passes through the mounting head (100) and extends to the bottom of the flexible outer tube (300). Multiple adsorption units (700) are disposed within the flexible inner tube (200), and the multiple adsorption units (700) are connected in series via an oxygen injection tube (400) and a heating wire (601) located within the flexible inner tube (200).

2. The nitrogen-oxygen separation double-layer liquefied air rock-breaking device according to claim 1, characterized in that, include: The mounting head (100) is also provided with an oxygen injection exhaust pipe (401) and a nitrogen injection exhaust pipe (501); the lower end of the oxygen injection exhaust pipe (401) extends into the flexible inner tube (200), and the lower end of the nitrogen injection exhaust pipe (501) extends into the gap between the inner and outer walls of the flexible outer tube (300) and the outer wall of the flexible inner tube (200).

3. The nitrogen-oxygen separation double-layer liquefied air rock-breaking device according to claim 2, characterized in that, The tops of the oxygen injection pipe (400), nitrogen injection pipe (500), oxygen injection exhaust pipe (401), and nitrogen injection exhaust pipe (501) are all equipped with sealing plugs.

4. A nitrogen-oxygen separation double-layer liquefied air rock-breaking device according to any one of claims 1-3, characterized in that, The mounting head (100) also includes a mounting neck (101) at the bottom. The upper opening of the flexible inner tube (200) is fixed to the mounting neck (101) by a first locking clamp (201), and the upper opening of the flexible outer tube (300) is fixed to the mounting head (100) by a second locking clamp (301).

5. A nitrogen-oxygen separation double-layer liquefied air rock-breaking device according to any one of claims 1-3, characterized in that, The adsorption unit (700) includes a filling shell (701) and an adsorption filler (800). The filling shell (701) is a hollow cylindrical box. The adsorption filler (800) is filled into the filling shell (701). The filling shell (701) has through holes (702) at the top and bottom. The oxygen injection pipe (400) and the heating wire (601) pass through the through holes (702).

6. The nitrogen-oxygen separation double-layer liquefied air rock-breaking device according to claim 5, characterized in that, The oxygen injection tube (400) is fixedly provided with a limiting cap (402) at the bottom, and the outer diameter of the limiting cap (402) is larger than the inner diameter of the through hole (702).

7. A nitrogen-oxygen separation double-layer liquefied air rock-breaking device according to claim 5, characterized in that, The side wall of the filling shell (701) is also provided with liquid permeation holes (703).

8. A nitrogen-oxygen separation double-layer liquefied air rock-breaking device according to any one of claims 1-3, characterized in that, The detonator (600) is provided with a detonation wire, which is connected to the detonation controller.

9. A nitrogen-oxygen separation double-layer liquefied air rock-breaking device according to any one of claims 1-3, characterized in that, The mounting head (100) is made of foam, and the flexible inner tube (200) and flexible outer tube (300) are both made of PE.

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