A phase change rock breaking device based on combination of liquid oxygen and liquid nitrogen

Abstract

The application discloses a phase change expansion rock breaking device based on combination of liquid oxygen and liquid nitrogen, and relates to the technical field of rock blasting. The device comprises a liquid nitrogen containing bag, an upper fixing assembly, a lower fixing assembly, a paper winding structure and a liquid oxygen and liquid nitrogen supply system. The liquid nitrogen containing bag is in a hollow cylindrical structure. The upper fixing assembly is arranged above the liquid nitrogen containing bag, and the lower fixing assembly is arranged at the bottom of the liquid nitrogen containing bag. The paper winding structure is arranged inside the liquid nitrogen containing bag. The device uses the phase change expansion of liquid nitrogen and liquid oxygen under heat to break rocks. The liquid nitrogen containing bag is made of composite material, so that the liquid nitrogen containing bag can withstand the low temperature of liquid nitrogen and liquid oxygen and will not be broken due to the brittleness of the material at low temperature. The design of the upper fixing assembly and the lower fixing assembly and the use of glue ensure the airtightness of the cylindrical space formed by the upper fixing assembly, the lower fixing assembly and the liquid nitrogen containing bag, so that the liquid oxygen will not leak.

Description

Technical Field

[0001] This invention relates to the field of rock blasting technology, and in particular to a phase change expansion rock-breaking device based on the combination of liquid oxygen and liquid nitrogen. Background Technology

[0002] Currently, explosive blasting is mainly used during the excavation of tunnels, which has the following disadvantages:

[0003] 1. The blast shockwave is strong;

[0004] 2. The flying debris from the blast travels a considerable distance;

[0005] 3. High earthquake intensity;

[0006] 4. It produces toxic gases such as sulfur dioxide and carbon monoxide;

[0007] 5. There are significant safety hazards during transportation and storage.

[0008] In recent years, some new gas-based rock-breaking methods have emerged, such as carbon dioxide gas expansion rock-breaking and oxygen expansion rock-breaking, which effectively solve the shortcomings of the above-mentioned explosive blasting.

[0009] Oxygen-based rock breaking has several advantages over carbon dioxide-based rock breaking in the following aspects:

[0010] 1. In terms of providing heat for gas phase change, carbon dioxide rock breaking relies on the combustion of the excitation tube, while oxygen rock breaking relies on the combustion of the paper roll and the combustion-supporting effect of oxygen. The latter is less expensive than the former.

[0011] 2. Carbon dioxide rock breaking involves a potentially explosive chemical: potassium permanganate, while oxygen rock breaking does not contain any potentially explosive chemicals and is therefore safer.

[0012] 3. The gas phase change volume expansion factor of carbon dioxide is about 600 times, while that of oxygen is about 800 times. Therefore, oxygen is more effective at breaking rocks than carbon dioxide.

[0013] 4. The steel fracturing tubes used in carbon dioxide rock breaking are of fixed size and relatively short, making them unsuitable for deep-hole blasting and inconvenient to operate. In contrast, oxygen rock breaking uses flexible fracturing tubes that are fabricated on-site, suitable for different hole depths, and are easy to operate.

[0014] The above points demonstrate that oxygen is superior to carbon dioxide in rock breaking. However, liquid oxygen is more expensive than liquid nitrogen, and their phase change volume expansion coefficients are not significantly different. Therefore, we want to use liquid nitrogen instead of liquid oxygen for rock breaking. However, paper rolls will not burn in a liquid nitrogen-filled environment. Therefore, there is an urgent need for a phase change expansion rock breaking device based on the combination of liquid oxygen and liquid nitrogen. Summary of the Invention

[0015] To solve the above technical problems, the present invention provides a phase change expansion rock-breaking device based on the combination of liquid oxygen and liquid nitrogen, which utilizes the phase change expansion of liquid nitrogen and liquid oxygen when heated to achieve the effect of rock breaking.

[0016] To achieve the above objectives, the present invention provides the following solution:

[0017] This invention provides a phase change expansion rock-breaking device based on the combination of liquid oxygen and liquid nitrogen, comprising a liquid nitrogen container bag, an upper fixing component, a lower fixing component, a paper roll structure, and a liquid oxygen and liquid nitrogen supply system; the liquid nitrogen container bag is a hollow cylindrical structure; the upper fixing component is disposed above the liquid nitrogen container bag, and the lower fixing component is disposed at the bottom of the liquid nitrogen container bag; the paper roll structure is disposed inside the liquid nitrogen container bag; the liquid oxygen and liquid nitrogen supply system is used to supply liquid nitrogen into the liquid nitrogen container bag and to supply liquid oxygen to the inside of the liquid nitrogen container bag.

[0018] Optionally, the top of the liquid nitrogen container bag is provided with a liquid nitrogen bag annular structure, which is used to keep the liquid nitrogen container bag in a hollow cylindrical shape; the inner side of the liquid nitrogen container bag is provided with a liquid nitrogen filling single pipe and a liquid nitrogen bag exhaust pipe; the lower end of the liquid nitrogen filling single pipe extends to the lower part of the liquid nitrogen container bag and communicates with the interior of the liquid nitrogen container bag, and the lower end of the liquid nitrogen bag exhaust pipe extends to the upper part of the liquid nitrogen container bag and communicates with the interior of the liquid nitrogen container bag; the upper end of the liquid nitrogen filling single pipe is connected to the main liquid nitrogen filling pipe of the liquid oxygen and liquid nitrogen supply system.

[0019] Optionally, the lower fixing component includes a bag positioning clip and a bag-bearing assembly; the bag positioning clip is a hollow semi-cylindrical structure; the bag-bearing assembly includes a top plate, a receiving column, and a base plate; the receiving column is disposed in the middle of the top surface of the base plate, and the top plate is disposed on the top of the receiving column; the diameter of the base plate is larger than the diameter of the top plate, and the diameter of the top plate is larger than the diameter of the receiving column; the bag positioning clip is disposed on the base plate and located on the side of the top plate and the receiving column.

[0020] Optionally, a small wedge is provided at the top of the bag positioning clamp, with the inclined surface of the small wedge facing the center of the chassis; an elastic element is provided between the bag positioning clamp and the receiving column.

[0021] Optionally, the elastic element is a helical spring.

[0022] Optionally, the upper fixing component has the same structure as the lower fixing component; the upper fixing component has an exhaust port, a starter wire port, a liquid oxygen port, a liquid oxygen bag exhaust port, and a liquid nitrogen port in its mounting assembly.

[0023] Optionally, the paper roll structure includes a liquid oxygen single tube, liquid oxygen inlets, paper roll, ignition wire, and ignition plate; the lower end of the liquid oxygen single tube is provided with multiple liquid oxygen inlets, and the lower end of the liquid oxygen single tube extends to the inside of the paper roll; the lower end of the ignition wire is provided with the ignition plate, the ignition plate is disposed inside the paper roll, and the upper end of the ignition wire extends to the ground.

[0024] Optionally, the liquid oxygen and liquid nitrogen supply system includes a main liquid nitrogen tank, a liquid nitrogen sub-tank, a main liquid oxygen tank, and a liquid oxygen sub-tank; a vaporization booster is respectively installed between the main liquid nitrogen tank and the liquid nitrogen sub-tank, and between the main liquid oxygen tank and the liquid oxygen sub-tank; a main liquid nitrogen filling pipe is installed at the outlet end of the liquid nitrogen sub-tank, and a main liquid oxygen filling pipe is installed at the outlet end of the liquid oxygen sub-tank; valves are respectively installed on the main liquid nitrogen filling pipe and the main liquid oxygen filling pipe; the main liquid nitrogen filling pipe is connected to multiple individual liquid nitrogen filling pipes; the main liquid oxygen filling pipe is connected to multiple individual liquid oxygen filling pipes; the individual liquid nitrogen filling pipes are used to supply liquid nitrogen to the inside of the liquid nitrogen container bag, and the individual liquid oxygen filling pipes are used to supply liquid oxygen to the inside of the liquid nitrogen container bag.

[0025] The present invention achieves the following technical effects compared to the prior art:

[0026] This invention relates to a phase change expansion rock-breaking device based on the combination of liquid oxygen and liquid nitrogen. The gasification booster in the liquid oxygen / liquid nitrogen system utilizes the phase change expansion of the gas to generate a pressure difference, forcing the liquid from the remaining tanks into the filling manifold. The phase change expansion of the liquid nitrogen and liquid oxygen upon heating achieves the rock-breaking effect. The liquid nitrogen container is made of composite material, allowing it to withstand the low temperatures of liquid nitrogen and liquid oxygen without breaking due to material brittleness at low temperatures. The design of the upper and lower fixing components and the use of adhesive ensure the airtightness of the cylindrical space formed by the upper and lower fixing components and the liquid nitrogen container, preventing liquid oxygen leakage. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the phase change expansion rock breaking device based on the combination of liquid oxygen and liquid nitrogen of the present invention.

[0029] Figure 2 This is a schematic diagram of the liquid nitrogen container bag in the phase change expansion rock breaking device based on the combination of liquid oxygen and liquid nitrogen of the present invention.

[0030] Figure 3This is a schematic diagram of the lower fixing component in the phase change expansion rock breaking device based on the combination of liquid oxygen and liquid nitrogen of the present invention.

[0031] Figure 4 This is a schematic diagram of the structure of the bag positioning clip in the lower fixing component of the phase change expansion rock breaking device based on the combination of liquid oxygen and liquid nitrogen of the present invention.

[0032] Figure 5 This is a schematic diagram of the cylindrical assembly in the lower fixing component of the phase change expansion rock breaking device based on the combination of liquid oxygen and liquid nitrogen of the present invention.

[0033] Figure 6 This is a schematic diagram of the paper roll assembly in the phase change expansion rock breaking device based on the combination of liquid oxygen and liquid nitrogen of the present invention;

[0034] Figure 7 This is a schematic diagram of the upper fixing component in the phase change expansion rock breaking device based on the combination of liquid oxygen and liquid nitrogen of the present invention.

[0035] Figure 8 This is a simplified diagram of the ground-based liquid oxygen and liquid nitrogen supply system in the phase change expansion rock-breaking device based on the combination of liquid oxygen and liquid nitrogen of the present invention.

[0036] Explanation of reference numerals in the attached diagram: 1. Liquid nitrogen filling single pipe; 2. Liquid nitrogen bag vent pipe; 3. Liquid nitrogen bag ring structure; 4. Loading bag positioning clamp; 5. Loading assembly; 6. Small wedge; 7. Positioning plate; 8. Spring; 9. Top plate; 10. Supporting column; 11. Base plate; 14. Liquid oxygen filling single pipe; 15. Liquid oxygen filling hole; 16. Roll paper; 17. Ignition wire; 18. Ignition plate; 19. Vent hole; 20. Ignition wire through hole; 21. Liquid oxygen through hole; 22. Liquid oxygen bag vent hole; 23. Liquid nitrogen through hole; 24. Liquid oxygen main tank; 25. Vaporization booster; 26. Liquid nitrogen main tank; 27. Liquid oxygen sub-tank; 28. Liquid nitrogen sub-tank; 29. ​​Valve; 30. Liquid oxygen main pipe; 31. Liquid nitrogen main pipe. Detailed Implementation

[0037] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] like Figures 1 to 8As shown, this embodiment provides a phase change expansion rock-breaking device based on the combination of liquid oxygen and liquid nitrogen, including a liquid nitrogen container bag, an upper fixing component, a lower fixing component, a paper roll 16 structure, and a liquid oxygen and liquid nitrogen supply system; the liquid nitrogen container bag is a hollow cylindrical structure; the upper fixing component is located above the liquid nitrogen container bag, and the lower fixing component is located at the bottom of the liquid nitrogen container bag; the paper roll 16 structure is located inside the liquid nitrogen container bag; the liquid oxygen and liquid nitrogen supply system is used to supply liquid nitrogen into the liquid nitrogen container bag and to supply liquid oxygen to the inside of the liquid nitrogen container bag.

[0039] In this specific embodiment, a liquid nitrogen bag annular structure 3 is provided at the top of the liquid nitrogen container bag, which is used to keep the liquid nitrogen container bag in a hollow cylindrical structure; a liquid nitrogen filling single pipe 1 and a liquid nitrogen bag exhaust pipe 2 are provided on the inner side of the liquid nitrogen container bag; the lower end of the liquid nitrogen filling single pipe 1 extends to the lower part of the liquid nitrogen container bag and communicates with the interior of the liquid nitrogen container bag, and the lower end of the liquid nitrogen bag exhaust pipe 2 extends to the upper part of the liquid nitrogen container bag and communicates with the interior of the liquid nitrogen container bag; the upper end of the liquid nitrogen filling single pipe 1 is connected to the liquid nitrogen main pipe 31 of the liquid oxygen and liquid nitrogen supply system.

[0040] In a more specific embodiment, both the liquid nitrogen container bag and the liquid nitrogen filling tube 1 are made of cryogenic composite material. The liquid nitrogen filling tube 1 is L-shaped and has a diameter of 1 cm. The liquid nitrogen filling tube 1 is tightly attached to the inner bottom surface of the liquid nitrogen container bag and integrated with it. The horizontal short tube is 1 cm long and 10 mm from the bottom of the liquid nitrogen container bag. The vertical long tube passes through the liquid nitrogen through hole 23 of the upper fixed container bag structure to the opening, with a portion of the length remaining at the opening for connecting to the main liquid nitrogen filling tube 31. The vent pipe of the liquid nitrogen container bag is L-shaped, tightly attached to the inner top surface of the liquid nitrogen container bag and integrated with it. The horizontal short tube is 1 cm long and 25 mm from the top of the liquid nitrogen container bag. The vertical long tube passes through the vent through hole 19 of the upper fixed container bag structure to the opening, with a portion of the length remaining at the opening.

[0041] The upper fixing component and the lower fixing component have the same structure and are made of HSLA steel. The lower fixing component includes a bag positioning clip 4 and a bag assembly 5. The bag positioning clip 4 is a hollow semi-cylindrical structure. The bag assembly 5 includes a top plate 9, a receiving column 10 and a base plate 11. The receiving column 10 is provided in the middle of the top surface of the base plate 11, and the top plate 9 is provided on the top of the receiving column 10. The diameter of the base plate 11 is larger than the diameter of the top plate 9, and the diameter of the top plate 9 is larger than the diameter of the receiving column 10. The bag positioning clip 4 is movably mounted on the base plate 11 and located on the side of the top plate 9 and the receiving column 10.

[0042] A small wedge 6 is provided on the top of the bag positioning clamp 4, and the inclined surface of the small wedge 6 faces the center of the base plate 11; a helical spring 8 is provided between the bag positioning clamp 4 and the receiving column 10.

[0043] The mounting assembly 5 in the upper fixing component is provided with an exhaust port 19, a starter wire port 20, a liquid oxygen port 21, a liquid oxygen bag exhaust port 22, and a liquid nitrogen port 23. The diameter of the starter wire port 20 is 2mm, and the diameters of the exhaust port 19, liquid oxygen port 21, liquid oxygen bag exhaust port 22, and liquid nitrogen port 23 are all 10mm.

[0044] In a more specific embodiment, the thickness of the bag positioning clip 4 is 10mm and the height is 30mm. The small wedge 6 is located at the center of the top surface of the bag positioning clip 4. The length of the surface of the small wedge 6 in contact with the top surface is 15mm and the width is 8mm. One side of the small wedge 6 protrudes near the outer wall of the bag positioning clip 4, with a protrusion height of 10mm. The spring 8 has a diameter of 5mm and an initial length of 15mm. One side of the spring 8 is connected to the inner wall of the bag positioning clip 4 5mm below the center, and the other side is connected to the bag assembly 5. Initially, the two bag positioning clips 4 are tightly attached to the top plate 9, and the two bag positioning clips 4 are also tightly attached together to form a closed loop.

[0045] The base 11 is cylindrical with a base diameter of 80mm and a height of 20mm. A supporting column 10 with a base diameter of 50mm and a height of 20mm is attached tightly to its upper part to support the spring 8 of the bag positioning clip 4. The top plate 9 has a base diameter of 60mm and a height of 10mm. The three structures are tightly attached together, and the centers of their bases are on the same vertical line.

[0046] The paper roll 16 structure includes a liquid oxygen single tube 14, liquid oxygen filling holes 15, paper roll 16, ignition wire 17, and ignition plate 18; the lower end of the liquid oxygen single tube 14 is provided with multiple liquid oxygen filling holes 15, and the lower end of the liquid oxygen single tube 14 extends to the inside of the paper roll 16; the lower end of the ignition wire 17 is provided with an ignition plate 18, the ignition plate 18 is located inside the paper roll 16, and the upper end of the ignition wire 17 extends to the ground.

[0047] In a more specific embodiment, the roll of paper 16 has a diameter of 4 cm and a height of 8 cm, with a through hole in the center, the hole diameter being 1 cm. The liquid oxygen filling tube 14 is made of composite material, and its side wall has liquid oxygen filling holes 15 with a diameter of 0.5 cm. Two liquid oxygen filling holes 15 at the same height are symmetrical about the vertical center line of the liquid oxygen filling tube 14. The first pair of holes is located at the bottom of the liquid oxygen filling tube 14, and then a pair is set every 3 cm upwards, for a total of 6 pairs. The liquid oxygen filling tube 14 passes upwards through the liquid oxygen through hole 21 to the opening, with a portion of the length remaining at the opening for connecting to the main liquid oxygen filling tube 30. A starter plate 18 is attached to the center of the outer side wall of each roll of paper 16. The starter plates 18 are strung together by starter wires 17 with a diameter of 2 mm. The starter wires 17 pass upwards through the starter wires 17 to the opening, with a portion of the length reserved for connection to the wires of the starter device.

[0048] The liquid oxygen and liquid nitrogen supply system includes a liquid nitrogen main tank 26, a liquid nitrogen sub-tank 28, a liquid oxygen main tank 24, and a liquid oxygen sub-tank 27; a vaporization booster 25 is installed between the liquid nitrogen main tank 26 and the liquid nitrogen sub-tank 28, and between the liquid oxygen main tank 24 and the liquid oxygen sub-tank 27; a liquid nitrogen filling main pipe 31 is installed at the outlet end of the liquid nitrogen sub-tank 28, and a liquid oxygen filling main pipe 30 is installed at the outlet end of the liquid oxygen sub-tank 27; valves 29 are installed on the liquid nitrogen filling main pipe 31 and the liquid oxygen filling main pipe 30; the liquid nitrogen filling main pipe 31 is connected to multiple liquid nitrogen filling single pipes 1; the liquid oxygen filling main pipe 30 is connected to multiple liquid oxygen filling single pipes 14; the liquid nitrogen filling single pipe 1 is used to supply liquid nitrogen into the liquid nitrogen container bag, and the liquid oxygen filling single pipe 14 is used to supply liquid oxygen into the liquid nitrogen container bag.

[0049] The phase change expansion rock-breaking device based on the combination of liquid oxygen and liquid nitrogen in this embodiment is used as follows:

[0050] 1. Design the boreholes; determine the extent of each rock mass to be broken based on the site's geological conditions, and design the borehole depth, borehole spacing, row spacing, borehole diameter, and plugging length. These parameters should be adjusted based on the actual rock breaking effect at the site.

[0051] 2. Drilling; use a drilling rig to drill holes and number them. Mark the holes and accurately record parameters such as drilling depth, diameter, plugging length, and geological characteristics.

[0052] 3. Install the liquid oxygen / liquid nitrogen supply system; First, use both hands to pull outwards the two small wedges 6 at the top of the bottom container bag positioning clamp 4, causing the spring 8 to deform and the positioning plate 7 to move away from the center. Then, vertically lower the bottom of the prepared liquid nitrogen container bag into the gap between the container bag positioning clamp 4 and the top plate 9 in the container assembly 5. When it has descended 10mm, release the two small wedges 6, so that the container bag positioning clamp 4 returns to its original state of being tightly attached to the top plate 9. Then, use glue to seal the contact area to ensure its airtightness. Then, several rolls of paper 16 are strung together through liquid oxygen single tubes 14. Then, ignition plates 18 are attached to the side walls of the rolls of paper 16 and connected with ignition wires 17. Then, the rolls of paper 16, along with the liquid oxygen single tubes 14, are vertically lowered into the cylindrical space enclosed by the liquid nitrogen container bag until the bottom of the liquid oxygen tubes touches the top plate 9, ensuring that the top of the highest roll of paper 16 is 10mm lower than the top of the liquid nitrogen container bag. Then, the liquid nitrogen single tube 1, the liquid oxygen single tube 14, the liquid nitrogen bag exhaust pipe 2, and the ignition wire 17 are passed out through the corresponding holes in the structure that fixes the container bag at the top. Then, the two small wedges 6 of the container bag positioning clamp 4 at the top are pulled outward with both hands, so that the top of the liquid nitrogen container bag is inserted into the gap of 10mm between the container bag positioning clamp 4 and the top plate 9. The two small wedges 6 are released, so that the container bag positioning clamp 4 returns to its original state of being tightly attached to the top plate 9, ensuring the sealing of the cylindrical space formed in the middle. The entire device was then lowered to the bottom of the borehole.

[0053] 4. Hole plugging: After the liquid oxygen and liquid nitrogen supply system is installed, plug the borehole with drilling mud and drill cuttings. The plugging location is the gap between the liquid oxygen and liquid nitrogen supply system and the borehole opening. During the plugging process, pay attention to strengthening the protection of the vent pipe, liquid nitrogen single pipe 1, liquid oxygen single pipe 14, the vent pipe of the liquid nitrogen container bag, and the starter wire 17.

[0054] 5. Connect the ground-based liquid oxygen and liquid nitrogen supply system; after the borehole is plugged, connect the pre-existing liquid nitrogen filling single pipe 1 on the ground to the interface of the liquid nitrogen main pipe 31 of the ground-based liquid oxygen and liquid nitrogen supply system, ensuring that there is no air leakage at the interface. Similarly, connect the pre-existing liquid oxygen filling single pipe 14 on the ground to the interface of the liquid oxygen main pipe 30 of the ground-based liquid oxygen and liquid nitrogen supply system, ensuring that there is no air leakage at the interface.

[0055] 6. Connect the external fire starter; after connecting the ground-based liquid oxygen and liquid nitrogen supply system, connect the fire starter wire 17 to the wire of the fire starter, and use electrical tape to connect the joint to prevent leakage.

[0056] 7. Check the fire starter; check that all components in the device are connected correctly and meet the fire starter requirements.

[0057] 8. Liquid nitrogen supply: After the above operations are completed, open valve 29 on the main liquid nitrogen filling pipe 31 and turn on the vaporization booster 25. At this time, the liquid nitrogen in the main liquid nitrogen tank 26 undergoes a phase change, and the gas expands, squeezing the liquid nitrogen in the liquid nitrogen sub-tank 28, causing the liquid nitrogen to enter the main liquid nitrogen filling pipe 31 and then continue into the liquid nitrogen filling single pipe 1, finally flowing into the liquid nitrogen container bag. Subsequently, open valve 29 on the main liquid oxygen filling pipe 30 and turn on the vaporization booster 25. The liquid oxygen in the main liquid oxygen tank 24 undergoes a phase change, and the gas expands, squeezing the liquid oxygen in the liquid oxygen sub-tank 27, causing the liquid oxygen to enter the main liquid oxygen filling pipe 30 and then continue into the liquid oxygen filling single pipe 14, finally flowing into the cylindrical space formed by the upper fixed assembly, the lower fixed assembly, and the liquid nitrogen container bag. After filling is completed, cut the liquid nitrogen single pipe 1 and the liquid oxygen-nitrogen filling pipe on the ground, then close valve 29 on the main liquid nitrogen filling pipe 31 and the main liquid oxygen filling pipe 30, and turn off the vaporization booster 25. Move the ground-based liquid oxygen and liquid nitrogen supply system to a safe distance.

[0058] 9. According to the designed safe distance, conduct warnings and evacuate personnel, charge the ignition starter, and after charging is completed, start the device after confirming that personnel and equipment have reached the safe area. The ignition plate 18 causes the paper roll 16 to burn, generating heat. The heat is transferred to the surrounding liquid oxygen and liquid nitrogen, causing them to undergo phase change expansion and achieve the effect of breaking rocks.

[0059] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0060] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A phase change expansion rock-breaking device based on the combination of liquid oxygen and liquid nitrogen, characterized in that, It includes a liquid nitrogen container bag, an upper fixing component, a lower fixing component, a paper roll structure, and a liquid oxygen / liquid nitrogen supply system; the liquid nitrogen container bag is a hollow cylindrical structure; The upper fixing component is disposed above the liquid nitrogen container bag, and the lower fixing component is disposed at the bottom of the liquid nitrogen container bag; the roll paper structure is disposed inside the liquid nitrogen container bag; the liquid oxygen / liquid nitrogen supply system is used to supply liquid nitrogen to the inside of the liquid nitrogen container bag and to supply liquid oxygen to the inside of the liquid nitrogen container bag; the lower fixing component includes a container bag positioning clamp and a container assembly; the container bag positioning clamp is a hollow semi-cylindrical structure; the container assembly includes a top plate, a receiving column, and a bottom plate; the receiving column is disposed in the middle of the top surface of the bottom plate, and the top plate is disposed on the top of the receiving column; the diameter of the bottom plate is larger than the diameter of the top plate, and the diameter of the top plate is larger than the diameter of the receiving column; the container bag positioning clamp is disposed above the bottom of the container bag. The chassis is located on the side of the top plate and the receiving column; the liquid oxygen and liquid nitrogen supply system includes a liquid nitrogen main tank, a liquid nitrogen sub-tank, a liquid oxygen main tank, and a liquid oxygen sub-tank; a vaporization booster is respectively installed between the liquid nitrogen main tank and the liquid nitrogen sub-tank, and between the liquid oxygen main tank and the liquid oxygen sub-tank; a liquid nitrogen filling main pipe is installed at the outlet end of the liquid nitrogen sub-tank, and a liquid oxygen filling main pipe is installed at the outlet end of the liquid oxygen sub-tank; valves are respectively installed on the liquid nitrogen filling main pipe and the liquid oxygen filling main pipe; the liquid nitrogen filling main pipe is connected to multiple liquid nitrogen filling single pipes; the liquid oxygen filling main pipe is connected to multiple liquid oxygen filling single pipes; the liquid nitrogen filling single pipes are used to supply liquid nitrogen to the inside of the liquid nitrogen container bag, and the liquid oxygen filling single pipes are used to supply liquid oxygen to the inside of the liquid nitrogen container bag.

2. The phase change expansion rock-breaking device based on the combination of liquid oxygen and liquid nitrogen according to claim 1, characterized in that, The liquid nitrogen container bag has a liquid nitrogen bag ring structure at the top, which is used to keep the liquid nitrogen container bag in a hollow cylindrical shape; the liquid nitrogen container bag has a liquid nitrogen filling tube and a liquid nitrogen bag exhaust tube inside; the lower end of the liquid nitrogen filling tube extends to the lower part of the liquid nitrogen container bag and communicates with the interior of the liquid nitrogen container bag, and the lower end of the liquid nitrogen bag exhaust tube extends to the upper part of the liquid nitrogen container bag and communicates with the interior of the liquid nitrogen container bag; the upper end of the liquid nitrogen filling tube is connected to the main liquid nitrogen filling pipe of the liquid oxygen and liquid nitrogen supply system.

3. The phase change expansion rock-breaking device based on the combination of liquid oxygen and liquid nitrogen according to claim 1, characterized in that, The top of the bag positioning clamp is provided with a small wedge, and the inclined surface of the small wedge faces the center of the chassis; an elastic element is provided between the bag positioning clamp and the receiving column.

4. The phase change expansion rock-breaking device based on the combination of liquid oxygen and liquid nitrogen according to claim 3, characterized in that, The elastic element is a helical spring.

5. The phase change expansion rock-breaking device based on the combination of liquid oxygen and liquid nitrogen according to claim 1, characterized in that, The upper fixing component has the same structure as the lower fixing component; the upper fixing component has an exhaust port, a starter wire port, a liquid oxygen port, a liquid oxygen bag exhaust port, and a liquid nitrogen port in its mounting assembly.

6. The phase change expansion rock-breaking device based on the combination of liquid oxygen and liquid nitrogen according to claim 1, characterized in that, The paper roll structure includes a liquid oxygen single tube, liquid oxygen inlets, paper roll, ignition wire, and ignition plate; the lower end of the liquid oxygen single tube is provided with multiple liquid oxygen inlets, and the lower end of the liquid oxygen single tube extends to the inside of the paper roll; the lower end of the ignition wire is provided with the ignition plate, the ignition plate is disposed inside the paper roll, and the upper end of the ignition wire extends to the ground.

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