Cutting pen based on underwater emergency rescue cutting

Abstract

The invention provides a cutting pen based on underwater emergency rescue cutting. The cutting pen comprises a cutting pen body and an ignition mechanism. The ignition mechanism comprises an ignition assembly, a spring and a plugging assembly. The ignition assembly is fixedly arranged at the cutting end of the cutting pen body and provided with an ignition part corresponding to a lead of the cutting pen body. The ignition assembly is further provided with a sliding connecting end. The sliding connecting end is sleeved with the spring. The plugging assembly is in sliding connection with the sliding connection end in the central axis direction of the cutting pen body and locked to the sliding connection end. The plugging assembly abuts against the spring. The blocking assembly can be unlocked from the sliding connecting end after the non-electric cutting agent in the cutting pen body is ignited, and the blocking assembly is pushed out of the sliding connecting end by the spring. The cutting pen based on underwater emergency rescue cutting can effectively avoid the situation that a non-electric cutting agent is not ignited, the success rate of ignition is guaranteed, the ignition effect is guaranteed, and the cutting pen can be suitable for underwater cutting and is high in practicability.

Description

Technical Field

[0001] The present invention belongs to the technical field of emergency rescue cutting pens, and particularly relates to a cutting pen based on underwater emergency rescue cutting. Background Art

[0002] An emergency rescue cutting pen is a cutting tool that does not rely on electricity, and is mainly applicable to emergency rescue, space-limited areas, military and police operations, etc., and of course also includes underwater cutting. The emergency rescue cutting pen is filled with a cutting agent inside. After the lead wire at one end of its outer shell is ignited, a super-high-temperature molten metal jet generated by the super-strong oxidation reaction of the non-electric cutting agent is used to cut metal materials.

[0003] In the prior art, when an emergency rescue cutting pen is used for underwater cutting operations, ignition methods such as matches or lighters cannot be used. Therefore, an ignition structure is usually installed at the jet end of the emergency rescue cutting pen. When operating underwater, the lead wire needs to be ignited by the ignition structure, and after the lead wire ignites the non-electric cutting machine, it disengages from the emergency rescue cutting pen. However, this disengagement method usually involves manually pulling out the ignition structure directly by hand, which is affected by the underwater visibility, and the ignition structure and the emergency rescue cutting pen are in a sealed state, so it is impossible to judge whether the non-electric cutting machine is ignited. Therefore, there are often situations where the emergency rescue cutting pen is not ignited after the ignition structure disengages, and the ignition effect is poor. Summary of the Invention

[0004] An embodiment of the present invention provides a cutting pen based on underwater emergency rescue cutting, aiming to solve the problem of poor practicability caused by poor ignition effect during the underwater cutting operation of the existing emergency rescue cutting pen.

[0005] To achieve the above object, the technical solution adopted by the present invention is: to provide a cutting pen based on underwater emergency rescue cutting, including a cutting pen body and an ignition mechanism; wherein, the ignition mechanism includes:

[0006] An ignition assembly, fixedly arranged at the cutting end of the cutting pen body, having an ignition part corresponding to the lead wire of the cutting pen body; the ignition assembly also has a sliding connection end;

[0007] A spring, sleeved on the sliding connection end;

[0008] A plugging assembly, slidably connected to the sliding connection end along the central axis direction of the cutting pen body, and locked on the sliding connection end; the plugging assembly abuts against the spring; the plugging assembly is used to release the lock with the sliding connection end after the non-electric cutting agent in the cutting pen body is ignited, and is pushed by the spring to the outside of the sliding connection end.

[0009] In a possible implementation manner, the ignition assembly includes:

[0010] A sleeve is fixedly sleeved at the cutting end of the cutting pen body. One end of the sleeve extends out of the cutting pen body, and the extending end of the sleeve is the sliding connection end; a circular tail seat is provided at the other end of the sleeve.

[0011] An ignition module is arranged in the sleeve and is connected in series with a push switch arranged on the annular cylinder seat and a battery arranged in the plugging component through a wire.

[0012] In a possible implementation manner, the diameter of the circular tail seat is larger than the outer diameter of the sleeve.

[0013] In a possible implementation manner, the ignition module includes:

[0014] There are two pole columns. The two pole columns are annularly spaced around the axis of the sleeve and are both fixedly connected to the inner wall of the sleeve.

[0015] A resistance wire has two ends respectively connected to the two pole columns and is in contact with the lead wire of the cutting pen body.

[0016] In a possible implementation manner, the plugging component includes:

[0017] A cylindrical sleeve has an open round hole at one end for the extending end of the sleeve to be sleeved. The cylindrical sleeve also has an inner cavity spaced from the open round hole and a sliding hole communicating the open round hole and the inner cavity.

[0018] A piston is slidably arranged in the sliding hole.

[0019] A push rod is connected to the end of the piston away from the open round hole and extends into the inner cavity.

[0020] A single-arch elastic piece is fixedly arranged at the extending end of the push rod and has two ends extending radially towards both sides along the cylindrical sleeve.

[0021] There are two limiting structures. The two limiting structures are respectively connected to the two ends of the single-arch elastic piece and are respectively arranged in the cylindrical sleeve; each limiting structure has a locking portion that can be connected to the limiting hole on the outer wall of the sleeve along the radial direction of the cylindrical sleeve.

[0022] Wherein, after the non-electric cutting agent in the cutting pen body is ignited, the piston moves close to the inner cavity under the action of air pressure, and through the action of the single-arch elastic piece on the two limiting structures, the two locking portions are disengaged from the connection with the sleeve.

[0023] In a possible implementation, the cylindrical sleeve further has two auxiliary cavities, which are arranged annularly and spaced apart around the axis of the cylindrical sleeve outside the sliding hole and the open round hole, and are communicated with the inner cavity. The two auxiliary cavities respectively correspond to the two limiting structures;

[0024] Each of the limiting structures includes:

[0025] A limiting post, which is arranged in the corresponding auxiliary cavity, and one end extends into the through hole between the open round hole and the corresponding auxiliary cavity and corresponds to the limiting hole; the limiting post is the locking part;

[0026] A turning rod, which is rotatably arranged in the corresponding auxiliary cavity, one end is connected to the limiting post, and the other end is connected to the end of the single-arch elastic sheet.

[0027] In a possible implementation, a long strip sliding opening is provided at one end of the turning rod, and a connecting post connected to the long strip sliding opening is correspondingly provided on the limiting post.

[0028] In a possible implementation, a first sealing ring is provided on the inner wall of the open round hole.

[0029] In a possible implementation, the diameter of the open round hole is larger than the diameter of the sliding hole. An annular surface for the sleeve to contact is formed at the bottom surface of the open round hole, and a second sealing ring is provided on the annular surface.

[0030] In a possible implementation, the plugging assembly further includes a locking bolt, which is coaxially arranged with the cylindrical sleeve, and one end passes through a threaded hole provided on the cylindrical sleeve and extends into the inner cavity. The locking bolt is used to fix the position of the piston.

[0031] In this implementation, the ignition component in the ignition mechanism is fixedly arranged at the cutting end of the cutting pen body, and forms a seal through the connection between the plugging assembly and the sliding connection end, which can prevent water from entering during ignition. The plugging assembly can be polarity-locked with the sliding connection end, and the plugging assembly can determine to release the lock with the sliding connection end after the non-electric cutting machine is ignited, and then eject the plugging assembly through the compressed spring, which can effectively avoid the situation that the non-electric cutting agent is not ignited, ensure the success rate of ignition, ensure the ignition effect, be applicable to underwater cutting, and has strong practicability. Description of the Drawings

[0032] Figure 1 It is a schematic structural diagram of a cutting pen for underwater emergency rescue cutting provided by an embodiment of the present invention;

[0033] Figure 2The front view of the cutting pen for underwater emergency rescue cutting provided by the embodiment of the present invention;

[0034] Figure 3 The partial cross-sectional view (hiding the spring) of the cutting pen for underwater emergency rescue cutting provided by the embodiment of the present invention;

[0035] Figure 4 For Figure 3 The enlarged structural schematic diagram at position A of the cutting pen for underwater emergency rescue cutting shown in;

[0036] Figure 5 For Figure 3 The sectional view in the B-B direction of the cutting pen for underwater emergency rescue cutting shown in;

[0037] Figure 6 The cross-sectional view of the plugging component of the cutting pen for underwater emergency rescue cutting provided by the embodiment of the present invention.

[0038] Explanation of reference numerals:

[0039] 100, cutting pen body;

[0040] 10, lead wire;

[0041] 200, ignition mechanism;

[0042] 20, ignition component; 21, sleeve; 211, circular tail seat; 22, ignition module; 221, pole; 222, resistance wire; 223, battery; 224, push switch;

[0043] 30, spring;

[0044] 40, plugging component; 41, cylindrical sleeve; 411, open round hole; 412, inner cavity; 413, sliding hole; 414, auxiliary cavity; 42, piston; 43, ejector rod; 44, single-arch elastic piece; 45, limiting structure; 451, limiting column; 452, flipping rod; 453, long strip sliding opening; 454, connecting column; 46, first sealing ring; 47, second sealing ring; 48, locking bolt;

[0045] 50, airbag. Detailed implementation manners

[0046] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0047] Please refer to Figure 1 And Figure 2, the cutting pen based on underwater emergency rescue cutting provided by the present invention will be described below. The cutting pen based on underwater emergency rescue cutting includes a cutting pen body 100 and an ignition mechanism 200. Among them, the ignition mechanism 200 includes an ignition component 20, a spring 30, and a plugging component 40. The ignition component 20 is fixedly arranged at the cutting end of the cutting pen body 100 and has an ignition part corresponding to the lead 10 of the cutting pen body 100. The ignition component 20 also has a sliding connection end. The spring 30 is sleeved on the sliding connection end. The plugging component 40 is slidably connected to the sliding connection end along the central axis direction of the cutting pen body 100 and is locked to the sliding connection end. The plugging component 40 abuts against the spring 30. The plugging component 40 can release the locking with the sliding connection end after the non-electric cutting agent in the cutting pen body 100 is ignited and is pushed out of the sliding connection end by the spring 30.

[0048] Compared with the prior art, for the cutting pen based on underwater emergency rescue cutting provided in this embodiment, the ignition component 20 in the ignition mechanism 200 is fixedly arranged at the cutting end of the cutting pen body 100, and a seal is formed through the connection between the plugging component 40 and the sliding connection end, which can prevent water from entering during ignition. The plugging component 40 can be polar-locked with the sliding connection end, and the plugging component 40 can determine to release the locking with the sliding connection end after the non-electric cutting machine is ignited, and then the compressed spring 30 pushes the plugging component 40 out, which can effectively prevent the situation that the non-electric cutting agent is not ignited, ensure the success rate of ignition, ensure the ignition effect, be applicable to underwater cutting, and has strong practicability.

[0049] In some embodiments, the above-mentioned ignition component 20 can adopt the structure as Figure 3 shown. Refer to Figure 3 , the ignition component 20 includes a sleeve 21 and an ignition module 22. The sleeve 21 is fixedly sleeved at the cutting end of the cutting pen body 100, and one end of the sleeve 21 extends out of the cutting pen body 100, and the extended end of the sleeve 21 is the sliding connection end. The other end of the sleeve 21 is provided with a circular tail seat 211. The ignition module 22 is arranged in the sleeve 21 and is connected in series with a push switch 224 arranged on the annular cylinder seat and a battery 223 arranged in the plugging component 40 through a wire.

[0050] The sleeve 21 can be sleeved on the cutting end of the cutting pen body 100, and the circular tail seat 211 can ensure the abutment against the spring 30, and at the same time, the circular tail seat 211 can ensure the installation of the push switch 224. In addition, the lumen of the sleeve 21 can be correspondingly communicated with the cutting end of the cutting pen body 100, so that after the non-electric cutting agent is ignited, a metal jet can pass through.

[0051] Regarding the sleeve 21 and the cutting pen body 100, they can be connected by threads, or connected to a fixing ring fixedly arranged on the cutting pen body 100 by bolts.

[0052] In this embodiment, the ignition module 22 is in an electric ignition mode. Specifically, the ignition module 22 is connected in series with the push switch 224 and the battery 223 at the same time, and the push switch 224 can control the on-off of the series circuit. The battery 223 is located in the plugging component 40, which can ensure that after ignition, the battery 223 can pop out with the plugging component 40, ensuring that the battery 223 is far away from the cutting pen body 100 and improving safety. See Figure 2 , the plugging component 40 and the sleeve 21 are connected by an electrically connecting wire. At the same time, the electrically connecting wire can also pull the plugging component 40 after the plugging component 40 is ejected, preventing the plugging component 40 from falling to the bottom of the water and ensuring the reuse of the plugging component 40. Regarding the connection of the electrically connecting wire with the sleeve 21 and the plugging component 40, see Figure 2 , a waterproof electrical connection needs to be adopted. The specific connection structure is well-known to those skilled in the art and will not be elaborated here.

[0053] In some embodiments, the above-mentioned circular tailstock 211 can adopt a structure as Figure 2 shown. See Figure 2 , the diameter of the circular tailstock 211 is larger than the outer diameter of the sleeve 21. This structure can facilitate the formation of an annular abutting surface for limiting and abutting the spring 30.

[0054] In this embodiment, the spring 30 can be fixedly connected to the plugging component 40 to ensure that the spring 30 is separated from the sleeve 21 simultaneously with the plugging component 40, ensuring the reuse of the spring 30.

[0055] In some embodiments, the above-mentioned ignition module 22 can adopt a structure as Figure 3 shown. See Figure 3 , the ignition module 22 includes pole columns 221 and a resistance wire 222. There are two pole columns 221, and the two pole columns 221 are annularly spaced around the axis of the sleeve 21 and are both fixedly connected to the inner wall of the sleeve 21. The two ends of the resistance wire 222 are respectively connected to the two pole columns 221 and are in contact with the lead 10 of the cutting pen body 100. The resistance wire 222 is the ignition part.

[0056] The two pole columns 221 will respectively correspond to the positive and negative electrodes of the battery 223. The resistance wire 222 between them can heat up after the current is turned on and turn red after the temperature rises, and then can ignite the lead 10 of the cutting pen body 100.

[0057] The resistance wire 222 can be spiral to ensure an increased contact range with the lead 10.

[0058] See 3 and Figure 5 , the battery 223 can be arranged at the tail of the plugging component 40. There are two battery 223 compartments at the tail of the plugging component 40, and a cover plate is detachably connected to the tail of the plugging component 40.

[0059] In some embodiments, the above-mentioned plugging assembly 40 may adopt a structure as shown in Figure 3 and Figure 6 . Referring to Figure 3 and Figure 6 , the plugging assembly 40 includes a cylindrical sleeve 41, a piston 42, a push rod 43, a single-arch elastic sheet 44, and a limiting structure 45. One end of the cylindrical sleeve 41 has an open round hole 411 for the protruding end of the sleeve 21 to be sleeved. The cylindrical sleeve 41 also has an inner cavity 412 spaced from the open round hole 411, and a sliding hole 413 communicating the open round hole 411 and the inner cavity 412. The piston 42 is slidably disposed in the sliding hole 413. The push rod 43 is connected to the end of the piston 42 away from the open round hole 411 and extends into the inner cavity 412. The single-arch elastic sheet 44 is fixedly disposed at the protruding end of the push rod 43 and has two ends extending radially outward along both sides of the cylindrical sleeve 41. There are two limiting structures 45. The two limiting structures 45 are respectively connected to both ends of the single-arch elastic sheet 44, and the two limiting structures 45 are respectively disposed in the cylindrical sleeve 41. Each limiting structure 45 has a locking portion that can be connected to the limiting hole on the outer wall of the sleeve 21 along the radial direction of the cylindrical sleeve 41.

[0060] Among them, after the non-electric cutting agent in the cutting pen body 100 is ignited, the piston 42 moves close to the inner cavity 412 under the action of air pressure, and through the action of the single-arch elastic sheet 44 on the two limiting structures 45, the two locking portions are disengaged from the connection with the sleeve 21.

[0061] The cylindrical sleeve 41 can be sleeved on the protruding end of the sleeve 21 through the open round hole 411, and when sleeved, it is further limited and fixed by the locking portion of the limiting structure 45 and the limiting hole on the outer wall of the sleeve 21. At this time, the cylindrical sleeve 41 and the sleeve 21 form a seal.

[0062] Specifically, the working principle of the plugging assembly 40 is that when underwater cutting is required, the ignition structure can be triggered by pressing the switch 224. After the ignition structure ignites the lead wire 10 and the non-electric cutting agent is ignited, the air pressure in the area of the sleeve 21 and the sliding hole 413 will increase, and then the piston 42 will be pushed to move into the inner cavity 412. The piston 42 pushes the single-arch elastic sheet 44 through the push rod 43, so that while the single-arch elastic sheet 44 deforms, it respectively pulls the two limiting structures 45, and then the two locking portions are disengaged from the limiting holes. Subsequently, the spring 30 pops the cylindrical sleeve 41 out of the sleeve 21.

[0063] The single-arch elastic sheet 44 can pull the two limiting structures 45, and at the same time, during the process of the two limiting structures 45 locking the sleeve 21, it can also ensure that the two locking portions are continuously locked with the limiting holes through its own elastic force.

[0064] The plugging assembly 40 can determine whether the non-electric cutting agent is ignited through the changes in the air pressure in the casing 21 and the sliding hole 413, and can adapt to underwater cutting operations. At the same time, it can also ensure the ignition effect and has strong practicality.

[0065] In some embodiments, see Figure 3 The ignition mechanism 200 further includes an airbag 50, which is disposed in the lumen of the sleeve 21 and contains a certain amount of oxygen. The airbag 50 can rupture due to high temperature when the lead 10 is ignited, thereby releasing a certain amount of oxygen, which can further ensure the effect of igniting the non-electrical cutting agent.

[0066] In some embodiments, the cylindrical sleeve 41 may be formed as follows: Figure 4 and Figure 6 See the structure shown. Figure 4 and Figure 6 The cylindrical sleeve 41 also has two auxiliary cavities 414, which are arranged at intervals around the axis of the cylindrical sleeve 41 on the outside of the sliding hole 413 and the open circular hole 411, and are connected to the inner cavity 412. The two auxiliary cavities 414 correspond to the two limiting structures 45. The setting of the auxiliary cavities 414 can facilitate the installation of the limiting structure 45.

[0067] Each limiting structure 45 includes a limiting column 451 and a flip rod 452. The limiting column 451 is arranged in the corresponding auxiliary cavity 414, and one end thereof extends into the through hole between the open circular hole 411 and the corresponding auxiliary cavity 414, and corresponds to the limiting hole. The limiting column 451 is a locking part. The flip rod 452 is rotatably arranged in the corresponding auxiliary cavity 414, one end of which is connected to the limiting column 451, and the other end of which is connected to the end of the single-bow spring piece 44. The transfer point of the flip rod 452 is located at the middle position thereof.

[0068] The rotation axis of each flip rod 452 is perpendicular to the axis of the cylindrical sleeve 41. When the limiting column 451 is plugged into the limiting hole, the single-bow spring piece 44 will push the other ends of the two flip rods 452 outward. When the single-bow spring piece 44 is pushed by the push rod 43, the single-bow spring piece 44 deforms and pulls the other ends of the two flip rods 452. Then, after the flip rod 452 rotates, the two limiting columns 451 move outward and break away from the plugging with the limiting hole.

[0069] It should be noted that the cylindrical sleeve 41 can be formed by joining two semi-cylindrical halves, as shown in FIG. Figure 1 , to ensure the opening of the auxiliary cavity 414.

[0070] In some embodiments, the flip bar 452 may be used as follows: Figure 4 See the structure shown. Figure 4A long sliding opening 453 is provided at one end of the flip rod 452, and a connecting column 454 connected to the long sliding opening 453 is provided on the corresponding limiting column 451. When the flip rod 452 rotates, its end will be displaced in the axial direction of the cylindrical sleeve 41, and the setting of the long sliding opening 453 can just adapt to the displacement change here, ensuring the stable operation of the limiting column 451.

[0071] In some embodiments, the open circular hole 411 may be formed as follows: Figure 6 See the structure shown. Figure 6 A first sealing ring 46 is provided on the inner wall of the open circular hole 411 , and the first sealing ring 46 can ensure and increase the sealing effect between the cylindrical sleeve 41 and the sleeve 21 .

[0072] In some embodiments, the open circular hole 411 may be formed as follows: Figure 6 See the structure shown. Figure 6 The diameter of the open circular hole 411 is larger than the diameter of the sliding hole 413. The bottom surface of the open circular hole 411 forms an annular surface for the sleeve 21 to contact. A second sealing ring 47 is provided on the annular surface. The second sealing ring 47 can further increase the sealing effect between the cylindrical sleeve 41 and the sleeve 21, while ensuring that the internal air pressure is released only by pushing the piston 42.

[0073] In some embodiments, the blocking component 40 may be configured as follows: Figure 3 See the structure shown. Figure 3 The sealing assembly 40 also includes a locking bolt 48, which is coaxially arranged with the cylindrical sleeve 41, and one end of which passes through a threaded hole arranged on the cylindrical sleeve 41 and extends into the inner cavity 412. The locking bolt 48 can fix the position of the piston 42.

[0074] When the cutting pen body 100 is not in use, the locking bolt 48 can be abutted against the single-bow spring piece 44 to prevent the position change of the piston 42 due to external factors such as vibration, thereby ensuring a stable connection between the blocking component 40 and the sleeve 21.

[0075] Before use, the locking bolt 48 can be rotated to separate it from the contact with the single-bow spring piece 44.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cutting pen based on underwater emergency rescue cutting, characterized in that: It includes a cutting pen body and an ignition mechanism; wherein the ignition mechanism includes: An ignition assembly is fixedly mounted at the cutting end of the cutting pen body and has an ignition portion corresponding to the lead of the cutting pen body; the ignition assembly also has a sliding connection end; A spring, sleeved on the sliding connection end; A blocking component is slidably connected to the sliding connection end along the central axis direction of the cutting pen body and locked on the sliding connection end; the blocking component abuts against the spring; the blocking component is used to release the lock with the sliding connection end after the non-electric cutting agent in the cutting pen body is ignited, and is pushed to the outside of the sliding connection end by the spring.

2. The cutting pen based on underwater emergency rescue cutting as claimed in claim 1, characterized in that: The ignition assembly comprises: A sleeve, fixedly sleeved at the cutting end of the cutting pen body, one end of the sleeve extending out of the cutting pen body, the extending end of the sleeve being the sliding connection end; the other end of the sleeve is provided with a circular tailstock; The ignition module is arranged in the sleeve and is connected in series with the push switch arranged on the annular cylinder seat and the battery arranged in the blocking component through a wire.

3. The cutting pen based on underwater emergency rescue cutting as claimed in claim 2, characterized in that: The diameter of the circular tailstock is greater than the outer diameter of the sleeve.

4. The cutting pen based on underwater emergency rescue cutting as claimed in claim 2, characterized in that: The ignition module comprises: There are two poles, the two poles are annularly spaced around the axis of the bushing and are both fixedly connected to the inner wall of the bushing; The two ends of the resistance wire are respectively connected to the two poles and are in contact with the lead wire of the cutting pen body.

5. The cutting pen based on underwater emergency rescue cutting as claimed in claim 2, characterized in that: The blocking component comprises: A cylindrical sleeve, one end of which has an open circular hole for the extended end of the sleeve to be sleeved, the cylindrical sleeve also has an inner cavity spaced apart from the open circular hole, and a sliding hole connecting the open circular hole and the inner cavity; A piston is slidably disposed in the slide hole, A push rod connected to the end of the piston away from the open circular hole and extending into the inner cavity; A single-bow spring piece is fixedly arranged in the protruding end of the push rod and has two ends extending radially toward both sides of the cylindrical sleeve; There are two limiting structures, the two limiting structures are respectively connected to the two ends of the single-bow spring piece, and the two limiting structures are respectively arranged in the cylindrical sleeve; each limiting structure has a locking portion that can be connected to the limiting hole on the outer wall of the sleeve along the radial direction of the cylindrical sleeve; Among them, after the non-electric cutting agent in the cutting pen body is ignited, the piston moves close to the inner cavity under the action of gas pressure, and the two limiting structures are acted on by the single-bow spring piece, so that the two locking parts are released from the connection with the sleeve.

6. The cutting pen based on underwater emergency rescue cutting as claimed in claim 5, characterized in that: The cylindrical sleeve also has two auxiliary cavities, which are arranged at annular intervals around the axis of the cylindrical sleeve on the outside of the sliding hole and the open circular hole and are connected to the inner cavity. The two auxiliary cavities correspond to the two limiting structures respectively. Each of the limiting structures comprises: A limiting column is arranged in the corresponding auxiliary cavity, and one end of which extends into the through hole between the open circular hole and the corresponding auxiliary cavity and corresponds to the limiting hole; the limiting column is the locking part; The flip rod is rotatably arranged in the corresponding auxiliary cavity, one end of which is connected to the limiting column, and the other end of which is connected to the end of the single-bow spring piece.

7. The cutting pen based on underwater emergency rescue cutting as claimed in claim 6, characterized in that: A long sliding opening is arranged at one end of the flip rod, and a connecting column connected with the long sliding opening is correspondingly arranged on the limiting column.

8. The cutting pen based on underwater emergency rescue cutting as claimed in claim 5, characterized in that: A first sealing ring is arranged on the inner wall of the open circular hole.

9. The cutting pen based on underwater emergency rescue cutting as claimed in claim 5, characterized in that: The diameter of the open circular hole is greater than the diameter of the sliding hole. An annular surface for the sleeve to contact is formed at the bottom surface of the open circular hole, and a second sealing ring is provided on the annular surface.

10. The cutting pen based on underwater emergency rescue cutting as claimed in claim 5, characterized in that: The blocking assembly also includes a locking bolt, which is coaxially arranged with the cylindrical sleeve and has one end extending into the inner cavity after passing through a threaded hole arranged on the cylindrical sleeve. The locking bolt is used to fix the position of the piston.

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