A portable underwater emergency cutting knife based on self-propagating reaction and a method for using the same

Abstract

The application provides a portable underwater emergency cutting knife based on a self-propagating reaction and a use method thereof, the portable underwater emergency cutting knife comprises a handle and a blade body, a first ignition assembly is arranged in the handle, the blade body comprises a second ignition assembly, a heat insulation layer and a self-propagating reaction stack, the handle and the blade body are detachably connected, when the handle and the blade body are in a connected state, the first ignition assembly is communicated with the second ignition assembly and is used for igniting the self-propagating reaction stack. The application cuts objects by using the heat generated by the self-propagating reaction, the overall detachable connection is convenient for carrying and transportation, and the blade body can be replaced many times according to the use requirement, so that the cutting requirement under different conditions is met. The operation method of the portable underwater emergency cutting knife based on the self-propagating reaction is simple, safe and reliable in the operation process, long-time emergency cutting operation can be realized under the condition that there is no external power supply underwater, and the application has a wide application prospect.

Description

Technical Field

[0001] This invention relates to the field of underwater emergency cutting, and particularly to a portable underwater emergency cutting knife based on a self-propagating reaction, as well as a method for using the aforementioned portable underwater emergency cutting knife. Background Technology

[0002] With the advancement of technology and social development, human activity has gradually expanded from land to the ocean. Simultaneously, the marine environment has brought a series of challenges to human activities at sea, such as difficulties in dismantling old underwater equipment, underwater rescue, and salvage. This has spurred the development of underwater cutting technology. Currently, based on the basic principles and cutting conditions of various underwater cutting methods, existing underwater cutting technologies can be broadly divided into two categories: underwater thermal cutting and underwater cold cutting. Underwater cold cutting utilizes mechanical or kinetic energy to cut workpieces. Common underwater cold cutting technologies include mechanical cutting, high-pressure water cutting, and shaped charge cutting. Underwater thermal cutting technology involves heating the workpiece to melt the material or burning it in oxygen, then removing the molten metal and slag. Underwater thermal cutting technologies include melting cutting, oxidation cutting, and melting-oxidation cutting. Patent 202321404165.6 discloses an underwater cutting machine, including a fixed base, a motor, a rotating shaft, and a battery, providing a wireless underwater cutting device. However, the device is large and inconvenient to carry, requires continuous energy consumption and is difficult to replenish in time, and cannot meet the needs of long-term underwater emergency rescue.

[0003] Self-propagating reaction is a technique that utilizes the self-heating and self-conduction of the high heat of chemical reaction between reactants to synthesize materials. Once the reactants are ignited, they automatically propagate to unreacted areas until the reaction is complete. This characteristic makes it a promising candidate for underwater thermal cutting.

[0004] Based on this, a portable underwater emergency cutting knife based on self-propagating reaction and its usage method are provided. This underwater emergency cutting knife has the advantages of easy assembly, convenient carrying, and energy saving, while also meeting the need for timely replenishment of consumed energy. It is of great significance to the development of underwater emergency cutting technology and is also a technical problem that urgently needs to be solved. Summary of the Invention

[0005] One of the objectives of this invention is to provide a portable underwater emergency cutting knife based on a self-propagating reaction that is easy to assemble, convenient to carry, and meets the needs of long-term underwater cutting.

[0006] The second objective of this invention is to provide a method for using a portable underwater emergency cutting knife based on a self-propagating reaction that is easy to assemble, convenient to carry, and meets the needs of long-term underwater cutting.

[0007] One of the technical solutions adopted to achieve the objective of this invention is to provide a portable underwater emergency cutting knife based on self-propagating reaction, comprising: a handle and a blade;

[0008] The handle is equipped with a first ignition assembly;

[0009] The blade includes a second ignition assembly, an insulation layer, and a self-propagating reactor; the self-propagating reactor comprises, by weight percentage: CuO 27%–35%, Fe2O3 20%–25%, NiO 10%–15%, Nb2O5 3%–8%, Al 20%–24%, CaF2 1%–4%, SiO2 0.5%–2%, CaO 0.5%–2%, and CaCO3 0.5%–1%.

[0010] The handle and the blade are detachably connected. When the handle and the blade are connected, the first ignition assembly and the second ignition assembly are connected to ignite the self-propagating reactor.

[0011] The overall concept of this invention is as follows:

[0012] This invention provides a portable underwater emergency cutting knife based on a self-propagating reaction. The handle and blade are detachably connected, making it easy to assemble, carry, and transport, and preventing accidental combustion during transport. Ignition components are installed inside both the handle and blade. These components ignite the self-propagating reactor, initiating a self-propagating reaction. This self-propagating reaction is a self-sustaining reaction achieved through rapid automatic wave combustion. The reaction heat is extremely high, and the reaction speed is fast, allowing it to continue in an oxygen-free underwater environment. The high temperature generated by the combustion enables the cutting of underwater targets. Furthermore, the detachable design allows for multiple blade replacements after the self-propagating reactor inside the blade has burned out, meeting the need for continuous cutting.

[0013] This invention addresses the unique challenges of underwater cutting environments by modifying the composition of the self-propagating reactor. A small amount of Nb₂O₅ is added to the formula to react with aluminum and displace Nb. Firstly, since the exothermic reaction between aluminum and Nb₂O₅ is only about 60% of that between aluminum and Fe₂O₃ or aluminum and CuO, the reaction intensity is significantly controlled. Secondly, Nb has a higher density than Al and Fe, resulting in faster sinking after the reaction, allowing heat to be quickly transferred to the cutting area, thus achieving efficient, controllable, and safe underwater non-electric cutting. Considering that the main product of the self-propagating reaction is Al₂O₃, to prevent it from adhering to the head of the self-propagating system and affecting heat output, thereby reducing cutting efficiency, this invention introduces a certain amount of CaF₂, SiO₂, and CaO into the self-propagating reaction system. These components can form a slag with low viscosity, low freezing point, and low density with Al₂O₃, enhancing the product's fluidity and allowing it to quickly detach from the blade, improving heat utilization. Simultaneously, after detachment, it rapidly cools and solidifies upon contact with water, increasing safety during use. Preferably, all raw materials in the self-propagating reactor are in powder form, with Al powder having a particle size of 80-250 mesh and other raw material powders having a particle size of 50-300 mesh.

[0014] Furthermore, a certain proportion of CaCO3 is added to the self-propagating reactor composition of this invention. Its thermal decomposition produces CO2, which displaces water around the object being cut, slowing down the cooling rate and improving cutting efficiency. This invention limits the weight percentage of CaCO3 in the self-propagating reactor to 0.5% to 1%. Studies have found that when the CaCO3 content is below this range, it cannot effectively drain water or slow down the cooling rate; while when the content is above this range, the self-propagating system produces more CO2 during underwater combustion, resulting in a large number of bubbles in the water, obstructing the cutting area and hindering the cutting process. In addition, CaCO3 can also decompose to produce CaO, which also helps improve the flow properties of the product.

[0015] Furthermore, the portable underwater emergency cutting knife also includes a safety arm, with its two ends detachably connected to the handle and the blade, respectively; the safety arm contains an ignition connector for connecting the first ignition assembly and the second ignition assembly. The safety arm increases the distance between the worker and the blade, preventing burns during operation.

[0016] Furthermore, the heat insulation layer is disposed at the section connecting the blade and the safety arm or handle, and is made of a high-temperature resistant and fire-retardant material. This prevents the blade from igniting the safety arm or handle, ensuring safe and reliable operation. Preferably, the material of the heat insulation layer is selected from one or more combinations of ceramic fibers, silicates, aerogels, and foamed silicone.

[0017] Furthermore, the detachable connection between the safety arm, handle, and blade employs a structure including: an unlocking button, a latch, a spring mechanism, and a slot. Preferably, the unlocking button and latch are driven by an α-type spring.

[0018] Furthermore, the first ignition assembly includes a power supply, a switch, a first socket, and a first wire, wherein the power supply includes a battery slot and a battery inside it; the ignition connector includes a connector plug, a connector socket, and a connector wire; and the second ignition assembly includes a second connector plug, a second wire, an electric ignition head, and an ignition section.

[0019] Furthermore, the connector and the second connector are each provided with a protective sleeve made of a highly elastic and waterproof material; the ignition section is provided with a plug made of a highly elastic and waterproof material. Preferably, the highly elastic and waterproof material includes silicone and / or rubber.

[0020] Furthermore, in this invention, in order to facilitate the replacement of the blade in an underwater environment and reduce the impact of the underwater environment on the replacement process, the invention provides a first movable baffle at the inlet of the first insertion hole; a first drain hole is provided in the handle housing near the first insertion hole; a second movable baffle is provided at the inlet of the connecting insertion hole, and a second drain hole is provided in the safety arm housing near the connecting insertion hole.

[0021] Both the first and second movable baffles are made of insulating and waterproof materials (such as polypropylene and polyimide) and are inclinedly positioned at the corresponding socket inlets. The first and second movable baffles are controlled by their respective elastic mechanisms and rotating connectors: in the non-connected state, the movable baffles are closed by the elastic mechanisms to prevent water or dust from entering; during connection, the plug presses against the movable baffle, overcoming the resistance of the elastic mechanism, causing one end of the movable baffle to rotate around the rotating connector and open, thus opening the socket and completing the connection. Drainage holes in the handle housing and safety arm housing allow residual water in the sockets to drain promptly during underwater assembly, protecting the connection circuitry.

[0022] Furthermore, the outer shell of the handle and the outer shell of the safety arm are made of a high-strength waterproof material, which includes one or more combinations of polycarbonate (PC), polypropylene (PP), and polyurethane (PU).

[0023] Furthermore, the outer shell of the blade is made of stainless steel. Due to the high temperature of the self-propagating reaction, the stainless steel shell of the blade is consumed during use as the self-propagating reaction proceeds.

[0024] Furthermore, the first plug and the connecting plug are made of conductive metal, including copper and / or aluminum.

[0025] The second objective of this invention is achieved by providing a method for using a portable underwater emergency cutting knife based on a self-propagating reaction, as described in one objective of this invention, comprising the following steps:

[0026] S1. Assemble the handle and blade to connect the first ignition assembly with the second ignition assembly;

[0027] S2. Bring the tip of the blade close to the object that needs to be cut underwater;

[0028] S3. Press the switch to connect the circuit and ignite the self-propagating reactor. Use the high temperature generated by its combustion to slowly move the handle along the cutting direction to perform underwater cutting.

[0029] Furthermore, in step S1, the handle and the blade are connected by a safety arm, and the first ignition assembly and the second ignition assembly are connected by an ignition connector.

[0030] Furthermore, in step S1, the required amount of self-propagating reactor is calculated based on the required cutting size, and a suitable length of blade is selected to connect with the handle or safety arm to reduce waste.

[0031] Furthermore, in step S2, the blade is fed in, and the distance between the end of the blade and the object to be cut is controlled to be 0-5mm; this distance is adjusted according to the thickness of the object to be cut, and the thicker the object to be cut, the closer the distance.

[0032] Furthermore, the method of use also includes the following steps:

[0033] S4. The self-propagating reaction ends when the blade burns to the insulation layer. If the cutting task is not completed, remove the remaining blade, insert a new blade, and ignite the self-propagating reactor inside the new blade to continue the cutting task.

[0034] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0035] (1) The portable underwater emergency cutting knife based on self-propagating reaction provided by the present invention has a detachable design between the handle and the blade, which is convenient for carrying and transportation and can also prevent accidental combustion during carrying and transportation, making the carrying and transportation process safe and reliable. The first ignition component and the second ignition component in the handle and the blade are connected by a plug-in design, which is easy to assemble. The blade can also be replaced multiple times according to the needs of use to meet the cutting needs under different conditions.

[0036] (2) The portable underwater emergency cutting knife based on self-propagating reaction provided by this invention utilizes self-propagating reaction for underwater cutting, requiring very little external energy. This overcomes the limitations of using large amounts of external energy, saves energy, and achieves sustainable development. 0.5wt% to 1wt% of CaCO3 powder is added to the self-propagating reactor. Its thermal decomposition produces CO2, which displaces the water around the object being cut, reducing the cooling rate and increasing cutting efficiency. The CaO product of its thermal decomposition also helps improve the flow properties of the combustion products, allowing them to quickly detach from the blade and preventing combustion products from adhering to the blade head and affecting heat output, thus improving cutting efficiency.

[0037] (3) The portable underwater emergency cutting knife based on self-propagating reaction and its usage method provided by the present invention utilize the heat generated by the self-propagating reaction to cut objects. The whole is detachable and easy to carry and transport. The operation method is simple and the operation process is safe and reliable. It can realize long-term emergency cutting operation in the absence of external power source underwater and has broad application prospects. Attached Figure Description

[0038] Figure 1 A schematic diagram of the overall structure of a portable underwater emergency cutting knife based on self-propagating reaction provided in an embodiment of the present invention;

[0039] Figure 2 A cross-sectional schematic diagram of a tool holder provided in an embodiment of the present invention;

[0040] Figure 3 A cross-sectional schematic diagram of the safety arm provided in an embodiment of the present invention;

[0041] Figure 4 A schematic cross-sectional view of the blade provided in an embodiment of the present invention;

[0042] Wherein, 1-knife handle; 11-battery slot; 12-switch; 13-first wire; 14-first socket; 15-first unlock button; 16-first α-type spring; 17-first buckle; 18-first slot; 19-first movable baffle; 110-knife handle housing; 111-first drain hole; 2-safety arm; 21-connector plug protective sleeve; 22-connector plug; 23-connector slot; 24-connector wire; 25-connector socket; 2 6-Second unlock button; 27-Second α-type spring; 28-Second buckle; 29-Second slot; 210-Second movable baffle; 211-Safety arm housing; 212-Second drain hole; 3-Blade body; 31-Second plug protective sleeve; 32-Second plug; 33-Insulation layer; 34-Second wire; 35-Self-propagating reactor; 36-Ignition section; 37-Plug; 38-Electric ignition head; 39-Blade body housing; 310-Second slot. Detailed Implementation

[0043] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. 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.

[0044] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0045] Please see Figure 1-4 This invention provides a portable underwater emergency cutting knife based on a self-propagating reaction, comprising: a handle 1 and a blade 3; the handle 1 includes: a battery compartment 11 (containing a No. 7 battery), a switch 12, a first socket 14, a first unlock button 15, a first latch 17, and a first slot 18; the first unlock button 15 and the first latch 17 are driven by a first α-type spring 16; the switch 12, the first socket 14, and the battery compartment 11 are connected by a first wire 13; the battery compartment 11 and the switch 12 are connected to an electric igniter 38 via the first wire 13 and a second wire 34, thereby igniting the self-propagating reactor 35; the blade 3 includes: a second plug 32, a heat insulation layer 33, a self-propagating reactor 35, an ignition section 36, an electric igniter 38, a plug 37, and a second slot 310; the second plug 32 and the electric igniter 38 are connected by a second wire 34.

[0046] The composition of the self-propagating reactor, by weight percentage, includes: CuO 27%–35%, Fe2O3 20%–25%, NiO 10%–15%, Nb2O5 3%–8%, Al 20%–24%, CaF2 1%–4%, SiO2 0.5%–2%, CaO 0.5%–2%, and CaCO3 0.5%–1%.

[0047] When the handle 1 and the blade 3 are directly connected, the first insertion hole 14 of the handle 1 is used to connect and conduct electricity with the second plug 32 of the blade 3; the first slot 18 is the insertion port of the blade 3; the first latch 17 locks the second slot 310 of the blade 3 to fix the blade 3; the first unlocking button 15 is used to retract the first latch 17 to disassemble the blade 3. The second plug 32 of the blade 3 is connected and conduct electricity with the first insertion hole 14 of the handle 1; the second slot 310 is the locking point of the first latch 17 of the handle 1 to fix the handle 1 and the blade 3. When the handle 1 and the blade 3 are connected, pressing the switch 12 connects the ignition path, ignites the electric ignition head 38 and the ignition section 36, and then ignites the self-propagating reactor. The high temperature generated by the combustion of the self-propagating reactor is used as the cutting agent to achieve underwater emergency cutting.

[0048] Furthermore, to extend the distance between the worker and the blade and prevent burns from high temperatures, the portable underwater emergency cutting knife based on self-propagating reaction provided by this invention also includes a safety arm 2. The two ends of the safety arm 2 are detachably connected to the handle 1 and the blade 3, respectively. The safety arm 2 includes: a connector 22, a connector slot 23, a connector socket 25, a second unlock button 26, a second latch 28, and a second slot 29. The second unlock button 26 and the second latch 28 are driven by a second α-type spring 27. The connector 22 and the connector socket 25 are connected by a connecting wire 24.

[0049] When the safety arm 2 is connected to the handle 1 and the blade 3, the first insertion hole 14 of the handle 1 is used to connect to the connector 22 of the safety arm 2 for electrical conduction; the first slot 18 is the insertion port of the safety arm 2; the first latch 17 locks the connector slot 23 of the safety arm 2 to fix the safety arm 2; the first unlock button 15 is used to retract the first latch 17 to disassemble the safety arm 2; the second plug 32 of the blade 3 is connected to the connector 25 of the safety arm 2 for electrical conduction; the second slot 310 is the locking point of the second latch 28 of the safety arm 2 to fix the blade 3. The connector 22 of the safety arm 2 is connected to the first insertion hole 14 of the handle 1 for electrical conduction; the connector slot 23 is the locking point of the first latch 16 of the handle 1 to fix the safety arm 2; the connector 25 is used to connect to the second plug 32 of the blade 3; the second slot 29 is the insertion port of the blade 3; the second latch 28 locks the second slot 310 of the blade 3 to fix the blade 3; the second unlock button 26 is used to retract the second latch 28 to disassemble the blade 3.

[0050] Furthermore, when performing large-area cutting in underwater environments, the amount of self-propagating reactor material within a single blade 3 is limited, and there may be a need to replace the blade 3 underwater. This invention also provides a water-blocking structure at the connection points of the blade 3, handle 1, and safety arm 2, including a plug protective sleeve, a water-blocking plate, and a drainage hole. Specifically, the first insertion hole 14 of the handle 1 has a first movable baffle 19 at its head, and the connection insertion hole 25 of the safety arm has a second movable baffle 210 at its head; the connection plug 22 of the safety arm 2 has a first plug protective sleeve 21 at its head, and the second plug 32 of the blade has a second plug protective sleeve 31 at its head; during use, the handle housing 110 near the insertion hole 14 has a first drainage hole 111, and the safety arm housing 211 near the insertion hole 25 of the safety arm 2 has a second drainage hole 212. Both the first movable baffle 19 and the second movable baffle 210 are made of insulating and waterproof material and are inclinedly positioned at the corresponding socket inlets. The first movable baffle 19 and the second movable baffle 210 are connected to the sockets via springs and shafts, respectively. In the non-connected state, the movable baffles are closed under the action of the springs. During the connection operation, the plug presses against the movable baffles, overcoming the spring resistance to allow one end of the movable baffles to rotate around the shaft and open, thus opening the sockets and completing the connection. The first plug protective sleeve 21 and the first plug protective sleeve 31 are made of highly elastic material to prevent electrochemical corrosion caused by prolonged immersion of the blade plug underwater, and to prevent the plug from failing due to corrosion.

[0051] In embodiments of the present invention, the handle housing 110 and the safety arm housing 211 are made of polyurethane (PU); the blade housing 39 is made of stainless steel; the insulation layer 33 is made of foamed silicone; the first plug protective sleeve 21, the second plug protective sleeve 31, and the plug 37 are made of rubber; and the connecting plug 22 and the second plug 32 are made of copper. The above structure can also be made of other materials capable of achieving similar functions, and no further limitations are imposed here.

[0052] The present invention will be further described below with reference to specific embodiments, but these are not intended to limit the scope of the invention.

[0053] The composition of the self-propagating reactors used in Examples 1-4 of this invention, by weight percentage, is shown in Table 1 below.

[0054] Table 1

[0055]

[0056]

[0057] In the table above, all raw materials are in powder form. In Example 1, the particle size of Al powder is 100 mesh, and the particle size of other raw material powders is 150 mesh; in Example 2, the particle size of Al powder is 250 mesh, and the particle size of other raw materials is 300 mesh; in Examples 3 and 4, the particle size of Al powder is 80 mesh, and the particle size of other raw materials is 180 mesh.

[0058] Example 1

[0059] This embodiment provides a method for utilizing Figure 1 The method for underwater cutting of Q235 steel using a portable underwater emergency cutting tool based on a self-propagating reaction, as shown, includes the following steps:

[0060] Step 1: Remove the protective sleeve 21 of the connector plug and the protective sleeve 31 of the second connector plug, and connect the handle 1, the safety arm 2 and the 200mm long blade 3 in sequence through the first slot 18 and the second slot 29.

[0061] Step 2: Place the 30mm*200mm*8mm Q235 steel in water at a depth of 300mm, and place the plug of the blade 3 about 2mm away from the surface of the Q235 steel;

[0062] Step 3: Press switch 12 to connect the circuit. The electric ignition head 38 ignites and ignites the ignition section 36, which in turn ignites the self-propagating reactor 35 (composition shown in Table 1), burning off the plug 37. Slowly move the knife handle 1 along the width direction of Q235. After the reaction is complete, remove the Q235 steel. The Q235 steel has been successfully cut.

[0063] Example 2

[0064] This embodiment provides a method for utilizing Figure 1 The method for underwater cutting of 304 stainless steel using a portable underwater emergency cutting tool based on a self-propagating reaction, as shown, includes the following steps:

[0065] Step 1: Remove the protective sleeve 21 of the connector plug and the protective sleeve 31 of the second connector plug, and connect the handle 1, the safety arm 2 and the 200mm long blade 3 in sequence through the first slot 18 and the second slot 29.

[0066] Step 2: Place a 50mm*100mm*1mm piece of 304 stainless steel in water at a depth of 600mm, and place the blade 3 at a distance of 0mm from the surface of the 304 stainless steel.

[0067] Step 3: Press switch 12 to connect the circuit. The electric igniter 38 ignites and ignites the ignition section 36, which in turn ignites the self-propagating reactor 35 (composition shown in Table 1), burning off the plug 37. Slowly move the knife handle 1 along the width of the 304 stainless steel. After the reaction is complete, remove the 304 stainless steel. The 304 stainless steel has been successfully cut off.

[0068] Example 3

[0069] This embodiment provides a method for utilizing Figure 1 The method for underwater cutting of 301 stainless steel using a portable underwater emergency cutting tool based on a self-propagating reaction, as shown, includes the following steps:

[0070] Step 1: Remove the protective sleeve 21 of the connector plug and the protective sleeve 31 of the second connector plug, and connect the handle 1, the safety arm 2 and the 200mm long blade 3 in sequence through the first slot 18 and the second slot 29.

[0071] Step 2: Place a 100mm*200mm*8mm piece of 301 stainless steel in water at a depth of 500mm, and place the blade 3 about 2mm above the surface of the 301 stainless steel.

[0072] Step 3: Press switch 12 to connect the circuit. The electric igniter 38 ignites and ignites the ignition section 36, which in turn ignites the self-propagating reactor 35 (composition shown in Table 1). The plug 37 is burned off. The knife handle 1 is slowly moved along the length of the 301 stainless steel. After the reaction is complete, the 301 stainless steel is removed. The cut in the length direction is 23mm*120mm.

[0073] Example 4

[0074] This embodiment provides a method for utilizing Figure 1 The method for underwater cutting of 301 stainless steel using a portable underwater emergency cutting tool based on a self-propagating reaction, as shown, includes the following steps:

[0075] Step 1: Remove the protective sleeve 21 of the connector plug and the protective sleeve 31 of the second connector plug, and connect the handle 1, the safety arm 2 and the 200mm long blade 3 in sequence through the first slot 18 and the second slot 29.

[0076] Step 2: Place a 100mm*200mm*8mm piece of 301 stainless steel in water 500mm deep, and place the blade 3 about 2mm above the surface of the 301 stainless steel.

[0077] Step 3: Press switch 12 to connect the circuit. The electric ignition head 38 ignites and ignites the ignition section 36, which in turn ignites the self-propagating reactor 35 (composition shown in Table 1), burns off the plug 37, and slowly moves the handle 1 along the length of the 301 stainless steel.

[0078] Step 4: When the blade 3 burns down to the insulation layer 33, press the second unlock button 26, pull out the burnt-out blade 3, and insert the new blade 3; place the new blade 3 2mm above the 301 stainless steel cut end, press the switch to reconnect the circuit, the electric ignition head 38 of the new blade 3 burns and ignites the ignition section 36, which in turn ignites the self-propagating reactor 35 in the new blade 3 (with the same composition as the old blade), burns off the plug 37, slowly moves the handle along the length of the 301 stainless steel, and removes the 301 stainless steel after the reaction is complete. The 301 stainless steel is completely cut off.

[0079] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should recognize that any equivalent substitutions and obvious changes made based on the content of this specification should be included within the protection scope of the present invention.

Claims

1. A portable underwater emergency cutting knife based on a self-propagating reaction, characterized in that, include: Handle and blade; The handle is equipped with a first ignition assembly; The blade includes a second ignition assembly, an insulation layer, and a self-propagating reactor; The raw materials of the self-propagating reactor, by weight percentage, include: CuO 27%~35%, Fe2O3 20%~25%, NiO 10%~15%, Nb2O5 3%~8%, Al 20%~24%, CaF2 1%~4%, SiO2 0.5%~2%, CaO 0.5%~2%, and CaCO3 0.5%~1%; the Nb2O5 is used to react with Al in the self-propagating reaction to generate elemental Nb, so that the heat of the reaction is carried into the cutting area as the elemental Nb sinks. The handle and the blade are detachably connected. When the handle and the blade are connected, the first ignition assembly and the second ignition assembly are connected to ignite the self-propagating reactor.

2. The portable underwater emergency cutting knife based on self-propagating reaction according to claim 1, characterized in that, It also includes a safety arm, the two ends of which are detachably connected to the handle and the blade, respectively; the safety arm is provided with an ignition connector for connecting the first ignition assembly and the second ignition assembly.

3. The portable underwater emergency cutting knife based on self-propagating reaction according to claim 1 or 2, characterized in that, The detachable connection uses a structure including: an unlock button, a latch, a spring mechanism, and a slot.

4. The portable underwater emergency cutting knife based on self-propagating reaction according to claim 2, characterized in that, The first ignition assembly includes a power supply, a switch, a first socket, and a first wire; the ignition connector includes a connector plug, a connector socket, and a connector wire; the second ignition assembly includes a second connector plug, a second wire, an electric ignition head, and an ignition section.

5. The portable underwater emergency cutting knife based on self-propagating reaction according to claim 4, characterized in that, The connector and the second connector are respectively provided with protective sleeves made of high-elasticity waterproof material; the ignition section is provided with a plug made of high-elasticity waterproof material.

6. The portable underwater emergency cutting knife based on self-propagating reaction according to claim 4, characterized in that, A first movable baffle is provided at the entrance of the first socket; a first drain hole is provided on the handle housing near the first socket.

7. The portable underwater emergency cutting knife based on self-propagating reaction according to claim 4, characterized in that, A second movable baffle is provided at the entrance of the connection socket; a second drain hole is provided on the safety arm housing near the connection socket.

8. A method of using a portable underwater emergency cutting knife based on a self-propagating reaction according to any one of claims 1-7, characterized in that, Includes the following steps: S1. Assemble the handle and blade to connect the first ignition assembly with the second ignition assembly; S2. Align the end of the blade with the object to be cut underwater; S3. Press the switch to connect the circuit and ignite the self-propagating reactor. Use the high temperature generated by its combustion to slowly move the handle along the cutting direction to perform underwater cutting.

9. The method of use according to claim 8, characterized in that, In step S1, the handle and the blade are connected by a safety arm, and the first ignition assembly and the second ignition assembly are connected by an ignition connector.

10. The method of use according to claim 8, characterized in that, It also includes the following steps: S4. The self-propagating reaction ends when the blade burns to the insulation layer. If the cutting task is not completed, remove the remaining blade, insert a new blade, and ignite the self-propagating reactor inside the new blade to continue the cutting task.

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