Liquid oxygen fracturing pipe for underwater safe and efficient rock breaking

Abstract

The utility model provides a liquid oxygen fracturing pipe for underwater safe and efficient rock breaking, which relates to the field of underwater fracturing and comprises a pipe body, the upper end and the lower end of the pipe body are respectively provided with a sealing cover and a clamping piece, and the sealing cover and the clamping piece respectively seal the upper end and the lower end of the pipe body. The pipe body can be clamped in the blast hole through the clamping piece; the oxygen inhalation assembly is arranged in the tube body, and the oxygen inhalation assembly is used for adsorbing liquid oxygen; the liquid oxygen injection assembly is used for injecting liquid oxygen into the pipe body; the ignition excitation assembly comprises an electronic ignition head and an excitation cartridge bag, the electronic ignition head and the excitation cartridge bag are arranged in the oxygen inhalation assembly, and the electronic ignition head is used for igniting the excitation cartridge bag. The clamping piece is arranged below the pipe body, so that the pipe body can be clamped at any position in the blast hole, the clamping piece restrains the trend of upward movement of the pipe body, it can be ensured that the liquid oxygen fracturing pipe is fixed to the installation position, and the situation that the fracturing effect is affected due to floating of the liquid oxygen fracturing pipe is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of underwater fracturing, in particular to a liquid oxygen fracturing pipe for safe and efficient rock breaking under water. BACKGROUND

[0002] Traditional explosive blasting rock breaking has the advantages of large energy, high efficiency and low cost, but it produces harmful effects such as large vibration, shock wave, noise and flying stone during the blasting process, and produces toxic and harmful gases such as CO and NO2 after blasting, which is not conducive to the safety and environmental protection of the surrounding operation area. Mechanical rock breaking technology has the advantages of good safety, no flying stone and flexible use, but its operation cost is high, the rock breaking efficiency is low, and the mechanical drive consumes fuel oil and produces tail gas emission, which is not conducive to environmental protection.

[0003] Underwater rock mass engineering is an important branch of rock engineering, covering many fields such as port construction, dam construction, canal dredging, water diversion tunnel excavation and bridge foundation construction. At present, the underwater rock mass rock breaking construction mainly adopts the traditional explosive blasting method. However, this method has a series of problems that cannot be avoided, including the operation safety hazards that may occur in the processing, transportation, charging, packing and initiation of blasting equipment, and the environmental pollution problems such as seismic effect, air shock wave, noise, flying stone, dust and toxic gas caused by blasting. These factors significantly restrict its application in modern high safety and high environmental protection requirements scenarios.

[0004] Liquid gas rock breaking technology is a new type of rock breaking technology, which uses industrial liquid oxygen or liquid nitrogen oxygen mixture to physically phase change and expand to do work to break rocks, and has high rock breaking efficiency and rock breaking effect. However, this technology cannot be effectively applied to underwater rock mass rock breaking engineering, mainly due to the complexity of underwater operation environment, construction safety risk and the improvement of environmental protection requirements.

[0005] At present, the underwater liquid oxygen fracturing technology is still in the preliminary research stage, and its wide promotion and application need to solve the following two key problems: on the one hand, higher requirements are put forward for the waterproof performance of the fracturing device, and the existing waterproof technology mainly seals through glue, which is easy to crack under the condition of low temperature of liquid oxygen and high pressure of deep water, affecting the waterproof performance; on the other hand, the buoyancy of the fracturing device needs to be overcome to avoid the fracturing device floating up and affecting the fracturing effect. UTILITY MODEL CONTENTS

[0006] The utility model provides a liquid oxygen fracturing pipe for safe and efficient rock breaking under water, which aims at solving the problem that the existing fracturing device is easy to float up when fixed in the blast hole, affecting the fracturing effect.

[0007] In order to achieve the above purpose, the embodiment of the utility model provides a liquid oxygen fracturing pipe for safe and efficient rock breaking under water, which comprises:

[0008] a pipe body, an upper end and a lower end of the pipe body are respectively provided with a sealing cover and a clamping piece, the sealing cover and the clamping piece seal the upper end and the lower end of the pipe body respectively, and the clamping piece can clamp the pipe body in the blast hole;

[0009] an oxygen absorption assembly arranged in the pipe body, the oxygen absorption assembly being used for absorbing liquid oxygen;

[0010] a liquid oxygen injection assembly, comprising a liquid inlet pipe and an exhaust pipe, the liquid inlet pipe is inserted into the pipe body through the sealing cover, and a liquid outlet hole is arranged on the part of the liquid inlet pipe located in the pipe body, the liquid inlet pipe is communicated with a liquid oxygen supply device, and the oxygen absorption assembly surrounds the liquid inlet pipe; the exhaust pipe is arranged on the sealing cover, and the exhaust pipe is used for connecting the inside of the pipe body and the atmosphere;

[0011] an ignition excitation assembly, comprising an electronic ignition head and an excitation charge, the electronic ignition head and the excitation charge are arranged in the oxygen absorption assembly, and the electronic ignition head is used for igniting the excitation charge.

[0012] Preferably, the clamping piece comprises a sealing stub with a pointed bottom end, the sealing stub is hot melt connected with the pipe body to close the lower end of the pipe body, and a counterforce petal is arranged on the circumference of the sealing stub, one end of the counterforce petal is connected with the sealing stub, and the other end is used for clamping in the blast hole;

[0013] The clamping piece and the pipe body are made of semi-rigid material, and the included angle between the counterforce petal and the upper end of the sealing stub is an acute angle.

[0014] Preferably, the sealing cover is provided with a liquid inlet and an exhaust outlet, the liquid inlet pipe is inserted into the pipe body through the liquid inlet, the exhaust pipe is arranged on the exhaust outlet, and the liquid inlet and the liquid inlet pipe and the exhaust outlet and the exhaust pipe are sealed;

[0015] A double-recessed connecting hole is further arranged on the sealing cover, the double-recessed connecting hole is used for penetrating a wire electrically connected with the electronic ignition head, and the wire is glued in the double-recessed connecting hole;

[0016] Preferably, a protective cover is further arranged above the sealing cover, the protective cover is laterally provided with a wiring window, and the wire and the liquid inlet pipe penetrate the wiring window.

[0017] Preferably, the liquid inlet pipe comprises a first section located outside the pipe body and a second section located inside the pipe body, and the liquid outlet hole is arranged on the second section.

[0018] Preferably, the lower surface of the upper end of the sealing cover is further provided with a block-preventing ring, the second section is arranged in the block-preventing ring, and the block-preventing ring is used for providing a downward abutting force to the oxygen inhalation assembly.

[0019] Preferably, the excitation medicine bag comprises, from outside to inside, a plastic mesh bag, steel wool and carbon powder.

[0020] Preferably, the oxygen inhalation assembly comprises an oxygen inhalation medium and a sealing film, the oxygen inhalation medium is wrapped on the second section, and the sealing film is wrapped outside the oxygen inhalation medium.

[0021] The oxygen inhalation medium is one or more of paper material, cotton material or fiber material.

[0022] The above scheme of the utility model has the following beneficial effects:

[0023] In the application, the pipe body can be clamped at any position in the blast hole by arranging the clamping piece below the pipe body, the clamping piece restrains the upward movement trend of the pipe body, can ensure that the liquid oxygen fracturing pipe is fixed at the installation position, and avoids affecting the fracturing effect due to the upward floating of the liquid oxygen fracturing pipe.

[0024] In the application, the clamping piece comprises a counterforce petal, the arrangement of the counterforce petal neither affects the downward movement of the liquid oxygen fracturing pipe nor provides a force when the liquid oxygen fracturing pipe moves upward, thereby avoiding the upward floating of the liquid oxygen fracturing pipe. The arrangement of the counterforce petal can also make the liquid oxygen fracturing pipe adapt to blast holes with different diameters, thereby improving the applicability of the application.

[0025] Other features and advantages of the utility model will be described in detail in the following specific embodiment part. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a use schematic view of the utility model;

[0027] Figure 2 is a schematic view of the pipe body, the sealing cover and the clamping piece;

[0028] Figure 3 is a schematic view of the sealing cover;

[0029] Figure 4 is a schematic view of the protective cover;

[0030] Figure 5 is Figure 1 is an enlarged view of part A in FIG. 1.

[0031] REFERENCE SIGNS

[0032] 10-pipe body,

[0033] 20-sealing cover, 21-inlet, 22-outlet, 23-double concave connecting port, 24-protection cover, 25-anti-blocking ring,

[0034] 30-clamping piece, 31-sealing short pipe, 32-counterforce petal,

[0035] 40-oxygen absorption assembly,

[0036] 50-liquid oxygen injection assembly, 51-liquid inlet pipe, 52-exhaust pipe,

[0037] 60-ignition initiation assembly, 61-electronic ignition head, 62-initiation charge,

[0038] 70. packing

[0039] 80-sleeve. DETAILED DESCRIPTION

[0040] In order to make the technical problems, technical schemes and advantages to be solved by the present application more clear, the following will be described in detail in combination with the drawings and specific embodiments.

[0041] As Figures 1-5The utility model discloses an embodiment provides a kind of liquid oxygen induced cracking pipe for underwater safe and efficient rock breaking, including pipe body 10, oxygen absorption component 40, liquid oxygen injection component 50, ignition excitation component 60.Wherein pipe body 10 is the semi-rigid material made, such as PVC, PE material, with open top and bottom, sealing cover 20 is arranged at the upper end of pipe body 10, and lower end is provided with clamping piece 30, sealing cover 20 and clamping piece 30 can be respectively sealed to pipe body 10 at the upper end and lower end of pipe body 10, so that the inside of pipe body 10 is in sealed state, avoid the leakage of liquid oxygen or the liquid of pipe outside infiltrates.Pipe body 10 can be clamped in any position in blasthole under the action of clamping piece 30, the position of pipe body 10 in blasthole can be adjusted by clamping piece 30, and clamping piece 30 generates friction with the inner wall of blasthole, can overcome the upward buoyancy of pipe body 10, so that the present application need not adopt the mode of adding stuffing 70 to offset buoyancy, can greatly simplify operation steps, improve the construction efficiency of scene.Oxygen absorption component 40 is arranged in pipe body 10, and the oxygen absorption component 40 is used to adsorb liquid oxygen.Liquid oxygen is filled into pipe body 10 by liquid oxygen injection component 50, and liquid oxygen injection component 50 includes liquid inlet pipe 51 and exhaust pipe 52, wherein inlet pipe is inserted into pipe body 10 by sealing cover 20, and the part of liquid inlet pipe 51 in pipe body 10 is provided with liquid outlet hole, and the part of liquid inlet pipe 51 outside pipe body 10 is communicated with liquid oxygen supply device.Liquid oxygen provided by liquid oxygen supply device flows into pipe body 10 through liquid inlet pipe 51 and liquid outlet hole on liquid inlet pipe 51, and is adsorbed by oxygen absorption component 40.Liquid oxygen can be more uniformly adsorbed by oxygen absorption component 40 by wrapping oxygen absorption component 40 on the side of liquid inlet pipe 51 with liquid outlet hole, to ensure the effect of induced cracking.Exhaust pipe 52 is arranged on sealing cover 20, and exhaust pipe 52 is used to communicate the inside of pipe body 10 with atmosphere, and exhaust pipe 52 is used to exhaust the air in pipe body 10 when liquid oxygen is injected, and on the other hand, construction personnel can judge whether the liquid oxygen in pipe body 10 meets the cracking standard according to the state of gas exhausted by exhaust pipe 52.

[0042] Ignition excitation component 60 includes electronic ignition head 61 and excitation charge 62, and electronic ignition head 61 and excitation charge 62 are arranged in oxygen absorption component 40, and electronic ignition head 61 is used to ignite excitation charge 62, so that the volume of liquid oxygen changes rapidly and breaks pipe body 10, thereby producing the effect of induced cracking.

[0043] Further, clamping piece 30 includes a sealed short pipe 31, the lower end of sealed short pipe 31 is tapered, and the upper end of sealed short pipe 31 is connected with pipe body 10 by hot melting to close the lower end of pipe body 10.The hot melting connection can ensure the sealing between clamping piece 30 and pipe body 10, especially in the environment of low temperature of liquid oxygen and high pressure of deep water, the hot melting connection can not easily cause sealing failure, so that the effect of induced cracking can be ensured.

[0044] Further, the diameter of the upper end of the sealing stub 31 is larger than the diameter of the lower end of the pipe body 10, so that the lower end of the pipe body 10 can be inserted into the sealing stub 31, and then the two are connected by heat melting. This not only increases the contact area between the pipe body 10 and the sealing stub 31, but also improves the sealing effect. In addition, the sealing stub 31 can be fixed to the pipe body 10 in the axial direction by a bolt arranged in the radial direction of the sealing stub 31, so that the axial movement of the two is avoided.

[0045] Preferably, a sealing ring is arranged in the sealing stub 31 to seal the joint between the sealing stub 31 and the pipe body 10. In the embodiment, the upper end of the sealing stub 31 is tubular, and the lower end is a solid cone. The sealing ring is arranged at the joint between the upper end and the lower end of the sealing stub 31.

[0046] In order to achieve the clamping effect of the clamping piece 30, a plurality of counterforce petals 32 are arranged on the circumference of the sealing stub 31. The counterforce petals 32 are arranged at the upper end of the sealing stub 31, and one end of each counterforce petal 32 is connected to the sealing stub 31, and the other end is a free end for clamping on the inner wall of the blast hole. The included angle between the counterforce petals 32 and the upper end of the sealing stub 31 is an acute angle. When the clamping piece 30 slides downward in the blast hole, the free ends of the counterforce petals 32 will be closed under the extrusion of the blast hole wall, so that the liquid oxygen fracturing pipe can move downward smoothly and be adjusted in position. After the position is adjusted, the liquid oxygen fracturing pipe will move upward in the blast hole due to the buoyancy, and at this time, the free ends of the counterforce petals 32 will be opened and clamped on the blast hole wall, so that the liquid oxygen fracturing pipe is fixed in the blast hole, and the floating of the liquid oxygen fracturing pipe is avoided to affect the fracturing effect.

[0047] Preferably, the clamping piece 30 is made of a semi-rigid material, so that the counterforce petals 32 have a certain deformation effect under stress.

[0048] The sealing cover 20 is provided with a liquid inlet 21 and a gas outlet 22. The liquid inlet pipe 51 is inserted into the pipe body 10 through the liquid inlet 21, and the liquid inlet 21 and the liquid inlet pipe 51 are sealed to avoid leakage between the two. The liquid inlet 21 and the liquid inlet pipe 51 are sealed by sealant. The exhaust pipe 52 is arranged on the sealing cover 20 through the gas outlet 22, and the gas outlet 22 and the exhaust pipe 52 are also sealed to avoid leakage.

[0049] The sealing cover 20 is also provided with a double concave connecting port 23 for passing a wire. The wire is used to electrically connect the electronic ignition head 61 and supply power to the electronic ignition head 61. The wire and the double concave connecting port 23 are also sealed and solidified by sealant. It can be understood that the sealant has a waterproof effect.

[0050] A protective cover 24 is further arranged above the sealing cover 20. The protective cover 24 is a rectangular body with a closed upper end and an open bottom end. The bottom end of the protective cover 24 is fixed to the upper end of the sealing cover. The liquid inlet 21, the gas outlet 22 and the double concave connecting port 23 are all arranged in the protective cover 24. Wiring windows are further arranged on the side surface of the protective cover 24. The aforementioned wires, the liquid inlet pipe 51 and the gas outlet pipe 52 all pass through the protective cover 24 through the wiring windows. The protective cover 24 is arranged above the sealing cover 20 to prevent the liquid inlet pipe 51 and the gas outlet pipe 52 from being excessively bent, which may cause poor liquid inlet and gas outlet. The protective cover 24 can also prevent the liquid inlet pipe 51 and the gas outlet pipe 52 from falling off the liquid inlet 21 and the gas outlet.

[0051] The liquid inlet pipe 51 includes a first section and a second section. The first section is arranged outside the pipe body 10, and the second section is arranged inside the pipe body 10. The liquid outlet holes are arranged on the second section. The liquid outlet holes are arranged along the circumferential direction of the second section and are arranged in several groups along the axial direction of the second section.

[0052] A blocking prevention ring 25 is further arranged on the lower surface of the upper end of the sealing cover 20. The blocking prevention ring 25 is arranged below the liquid inlet 21. The second section passes through the liquid inlet 21 and the blocking prevention ring 25 in sequence and is inserted into the pipe body 10. During the process of filling liquid oxygen, the oxygen absorption assembly 40 may expand in the axial and radial directions. When the longitudinal expansion is large, the oxygen absorption assembly 40 may block the gas outlet 22. After the blocking prevention ring 25 is arranged, the oxygen absorption assembly 40 is subjected to the downward abutting force of the blocking prevention ring 25 when longitudinally expanding, which prevents the oxygen absorption assembly 40 from blocking the gas outlet 22 due to expansion. Thus, the problem of abnormal increase of the internal pressure of the pipe body 10 and the problem of liquid oxygen-induced pipe failure are avoided.

[0053] The aforementioned excitation package 62 includes a plastic mesh bag, steel wool and carbon powder. The carbon powder is wrapped by the steel wool, and the steel wool is wrapped by the plastic mesh bag.

[0054] The aforementioned oxygen absorption assembly 40 includes an oxygen absorption medium and a sealing film. The oxygen absorption medium is wrapped on the second section layer by layer. During the wrapping process, the electronic ignition head 61 and the excitation package 62 are simultaneously wrapped in the oxygen absorption medium. After the wrapping of the oxygen absorption medium is completed, the sealing film is wrapped outside the oxygen absorption medium. The sealing film can prevent the oxygen absorption medium from being discharged from the gas outlet pipe 52 after reaching the absorption saturation and can also achieve the effect of waterproofing and moisture resistance.

[0055] In the present application, the oxygen absorption medium is one or more of paper material, cotton material or fiber material. In the present embodiment, the oxygen absorption medium is a paper roll.

[0056] The use method of the present application includes the following steps:

[0057] Assembling the liquid oxygen-induced pipe.

[0058] S110. Select a pipe body 10 with a proper length according to the depth of the blast hole, and fix the clamping piece 30 to the lower end of the pipe body 10 by heat melting;

[0059] Preferably, the sealing ring is placed in the sealing short pipe 31, and then the clamping piece 30 is connected to the pipe body 10 by heat melting.

[0060] Preferably, after heat melting, several bolts can be screwed in the radial direction of the sealing short pipe 31 to limit the axial position of the sealing short pipe 31 and the pipe body 10. The bolts form blind holes in the pipe body 10 to avoid affecting the sealing of the pipe body 10.

[0061] S120. Place the oxygen absorption assembly 40, the liquid inlet pipe 51, and the ignition and excitation assembly 60 in the pipe body 10.

[0062] Wrap the oxygen absorption medium around the end of the liquid inlet pipe 51 with the liquid outlet hole, i.e., wrap the oxygen absorption medium around the second section of the liquid inlet pipe 51, and wrap the electronic ignition head 61 and the excitation charge 62 in the oxygen absorption medium during the wrapping process. According to the length of the pipe body 10, the ignition and excitation assembly 60 is at least provided with one. After the wrapping of the oxygen absorption medium is completed, wrap the sealing film outside the oxygen absorption medium, and place the oxygen absorption assembly 40 and the liquid inlet pipe in the pipe body 10.

[0063] S130. Install the exhaust pipe 52 and the liquid inlet pipe 51 on the sealing cover 20, and install the sealing cover 20 on the upper end of the pipe body 10 by heat melting.

[0064] When installing the exhaust pipe 52, fix the exhaust pipe 52 to the gas outlet 22, and use sealing glue to fix and seal. After the liquid inlet pipe 51 and the lead wire pass through the liquid inlet 21 and the double concave connection hole, cover the sealing cover 20 on the pipe body 10, and seal the sealing cover 20 by heat melting. After heat melting is completed, use sealing glue to seal and fix the liquid inlet pipe 51 and the liquid inlet 21, and the lead wire and the double concave connection hole.

[0065] Install the liquid oxygen fracturing pipe.

[0066] S210. Drill a blast hole in the underwater area where fracturing is needed.

[0067] A sleeve 80 is arranged in the underwater area, the diameter of the sleeve 80 needs to be greater than the diameter of the liquid oxygen fracturing pipe, the lower end of the sleeve 80 is abutted against the rock surface of the underwater area, and the rock surface in the area surrounded by the sleeve 80 is drilled to form a blast hole by using a drilling machine.

[0068] S220. Place the liquid oxygen fracturing pipe in the blast hole, keep the clamping piece 30 clamped on the inner wall of the blast hole, connect the electronic igniter and the exciter of each liquid oxygen fracturing pipe, and add the stemming 70 to seal the blast hole;

[0069] The liquid oxygen fracturing tube is placed in the blast hole, and the liquid oxygen fracturing tube is coaxial with the blast hole. The liquid oxygen fracturing tube is pushed down to the designated position, and the clamping piece 30 is clamped on the inner wall of the blast hole. Based on different fracturing requirements, the liquid oxygen fracturing tube can be located at the bottom of the blast hole, or at the middle or upper part of the blast hole.

[0070] The electronic igniter is connected with the trigger, and after the connection, the stemming 70 is added to the blast hole to seal the blast hole and the liquid oxygen fracturing tube and ensure that the exhaust pipe 52 exhausts normally. The exhaust end of the exhaust pipe 52 can be provided on the buoy.

[0071] Because the lower end of the liquid oxygen fracturing tube is provided with the clamping piece 30, the floating of the liquid oxygen fracturing tube can be effectively inhibited, and therefore, unlike the effect of the conventional stemming 70, the stemming 70 in the application does not need to play the role of inhibiting the floating of the liquid oxygen fracturing tube. The main role of the stemming 70 is to seal the blast hole.

[0072] Liquid oxygen is injected.

[0073] After the liquid oxygen is injected into the liquid oxygen fracturing tube, it is observed whether the exhaust pipe 52 has uniform white smoke overflow. When there is white smoke overflow, the injection of liquid oxygen is stopped, and the liquid inlet pipe is cut off.

[0074] When judging to stop injecting liquid oxygen, the length of the pipe body 10 can also be used to estimate the amount of liquid oxygen. Whether the overflow of white smoke and the amount of liquid oxygen reach the estimated amount can be used for judgment.

[0075] The liquid oxygen fracturing tube is ignited.

[0076] The operator withdraws from the fracturing area, and ignites the trigger to ignite the liquid oxygen fracturing tube within a predetermined time.

[0077] After the operator confirms that the exhaust pipe 52 has white smoke overflow, the operator withdraws from the fracturing area, and completes the ignition within 5 minutes to avoid liquid oxygen overflow. The fracturing effect is checked 15 minutes after the ignition is completed, and it is confirmed that all the blast holes are triggered.

[0078] The above is the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, without departing from the principle of the present application, a number of improvements and refinements can be made, and these improvements and refinements should be regarded as the protection range of the present application.

Claims

1. A liquid oxygen fracturing tube for safe and efficient underwater rock breaking, characterized in that, include: The tube body (10) is provided with a sealing cap (20) and a snap-fit ​​component (30) at its upper and lower ends respectively. The sealing cap (20) and the snap-fit ​​component (30) seal the upper and lower ends of the tube body (10) respectively. The snap-fit ​​component (30) can snap the tube body (10) into the borehole. An oxygen absorption assembly (40) is disposed inside the tube body (10) and is used to absorb liquid oxygen; The liquid oxygen injection assembly (50) includes an inlet pipe (51) and an outlet pipe (52). The inlet pipe (51) is inserted into the tube body (10) by the sealing cap (20), and the portion of the inlet pipe (51) located inside the tube body (10) is provided with an outlet hole. The inlet pipe (51) is connected to a liquid oxygen supply device, and the oxygen absorption assembly (40) surrounds the inlet pipe (51). The outlet pipe (52) is disposed on the sealing cap (20) and is used to connect the inside of the tube body (10) to the atmosphere. The ignition and activation assembly (60) includes an electronic ignition head (61) and an activation pack (62), wherein the electronic ignition head (61) and the activation pack (62) are disposed within the oxygen inhalation assembly (40), and the electronic ignition head (61) is used to ignite the activation pack (62).

2. The liquid oxygen fracturing tube for safe and efficient underwater rock breaking according to claim 1, characterized in that: The snap-fit ​​component (30) includes a sealing short tube (31) with a pointed bottom end. The sealing short tube (31) is heat-fused to the tube body (10) to seal the lower end of the tube body (10). A reaction petal (32) is provided in the circumferential direction of the sealing short tube (31). One end of the reaction petal (32) is connected to the sealing short tube (31), and the other end is used to snap into the borehole. The snap-fit ​​(30) and the tube (10) are made of semi-rigid material, and the angle between the reaction petal (32) and the upper end of the sealing short tube (31) is an acute angle.

3. The liquid oxygen fracturing tube for safe and efficient underwater rock breaking according to claim 1, characterized in that: The sealing cap (20) is provided with a liquid inlet (21) and an air outlet (22). The liquid inlet pipe (51) is inserted into the pipe body (10) through the liquid inlet (21). The exhaust pipe (52) is provided on the air outlet (22). The liquid inlet (21) and the liquid inlet pipe (51) are sealed together, and the air outlet (22) and the exhaust pipe (52) are sealed together. The sealing cover (20) is also provided with a double concave connection port (23), which is used to pass through a wire that is electrically connected to the electronic ignition head (61), and the wire is glued to the double concave connection port (23).

4. The liquid oxygen fracturing tube for safe and efficient underwater rock breaking according to claim 3, characterized in that: A protective cover (24) is also provided above the sealing cover (20). The protective cover (24) has a wiring window on the side, through which the wire and the liquid inlet pipe (51) pass.

5. The liquid oxygen fracturing tube for safe and efficient underwater rock breaking according to claim 1, characterized in that: The inlet pipe (51) includes a first section located outside the pipe body (10) and a second section located inside the pipe body (10), and the outlet hole is provided on the second section.

6. The liquid oxygen fracturing tube for safe and efficient underwater rock breaking according to claim 5, characterized in that: The lower surface of the upper end of the sealing cap (20) is also provided with an anti-clogging ring (25), and the second section passes through the anti-clogging ring (25). The anti-clogging ring (25) is used to provide a downward resisting force to the oxygen inhalation assembly (40).

7. The liquid oxygen fracturing tube for safe and efficient underwater rock breaking according to claim 5, characterized in that: The activation pack (62) includes a plastic mesh bag, steel wool and carbon powder wrapped from the outside to the inside.

8. The liquid oxygen fracturing tube for safe and efficient underwater rock breaking according to claim 5, characterized in that: The oxygen absorption assembly (40) includes an oxygen absorption medium and a sealing membrane, wherein the oxygen absorption medium is wrapped around the second section and the sealing membrane is wrapped around the oxygen absorption medium. The oxygen-absorbing medium is one or more of paper, cotton, or fiber materials.

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