An underwater plasma cutting device for shipwreck salvage

Abstract

This invention relates to the technical field of underwater engineering equipment, and in particular to an underwater plasma cutting device for salvaging shipwrecks. The device includes a housing, a plasma cutting head, and a handle. The plasma cutting head is located at the bottom of the housing, and the handle is mounted on the housing. The device further includes: a buffer distance-fixing component mounted on the housing for adjusting the distance between the handle and the object to be cut; a locking component mounted on the buffer distance-fixing component for locking the buffer distance-fixing component; and an anti-drop component mounted on the handle for preventing the handle from falling off. In use, the operator connects the housing to a standard underwater plasma power system. Holding the handle, the operator swims towards the shipwreck and cuts the portion of the shipwreck. The buffer distance-fixing component ensures optimal contact between the plasma cutting head and the part of the shipwreck to be cut, improving the efficiency and accuracy of underwater shipwreck cutting.

Description

Technical Field

[0001] This invention relates to the technical field of underwater engineering equipment, and in particular to an underwater plasma cutting device for salvaging sunken ships. Background Technology

[0002] Plasma cutting technology has been widely used in land-based industries due to its advantages such as high cutting speed, wide range of applicable materials, and good cut quality. In recent years, this technology has also been explored for application in underwater engineering, such as shipwreck salvage and underwater structure demolition. However, effectively applying plasma cutting technology to underwater environments, especially complex shipwreck salvage sites, still faces a series of technical challenges that urgently need to be solved.

[0003] Existing underwater plasma cutting equipment is typically modified from land-based equipment with simple waterproofing and pressure resistance modifications. For example, Chinese utility model patent CN209503208U discloses a "plasma cutting device." While this device is compact and easy to move, its core design relies on a longitudinal and lateral motor-gear-rack mechanism to achieve precise movement of the cutting head in a two-dimensional plane. However, this device and the existing technology it represents have the following inherent flaws, making it completely unsuitable for the stringent requirements of shipwreck salvage operations: 1. Lack of adaptability to complex cutting surfaces: Shipwrecks often deform underwater, resulting in uneven surfaces covered with marine life and rust. Existing cutting heads are typically rigidly fixed or have only very limited, simple buffering, relying entirely on the operator's experience to manually adjust the distance. In underwater conditions with low visibility and strong currents, operators find it difficult to maintain the optimal cutting distance between the nozzle and the workpiece by sight and touch. Too close a distance can easily cause the nozzle to collide and damage the workpiece; too far a distance can lead to unstable arcs and energy dispersion, resulting in incomplete cuts or poor cut quality. The two-dimensional motion platform in CN209503208U is only suitable for cutting on flat, stable land-based workpieces along preset paths and is powerless against random, irregular underwater surfaces.

[0004] 2. Lack of Human-Machine Interaction and Safety Assurance: There is a serious deficiency in intuitive and reliable operational feedback and emergency safety devices designed for the special underwater environment. For example, there is a lack of devices that clearly indicate the equipment status (such as whether it is locked at the optimal distance) in poor visibility conditions, as well as safety mechanisms to prevent heavy equipment from accidentally falling off and to enable personnel to quickly escape in an emergency. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides an underwater plasma cutting device for shipwreck salvage.

[0006] The present invention provides an underwater plasma cutting device for shipwreck salvage, comprising a shell, a plasma cutting head, and a handle. The plasma cutting head is disposed at the bottom end of the shell, and the handle is disposed on the shell. The device also includes: A buffer spacing assembly, mounted on the housing, is used to adjust the distance between the handle and the workpiece to be cut; A locking component, which is mounted on the buffer spacing component, is used to lock the buffer spacing component; The anti-drop component, installed on the handle, prevents the handle from falling off. During use, the operator connects the housing to a standard underwater plasma power system. Then, the operator swims towards the sunken ship, holding the handle. When cutting a section of the shipwreck is required, the operator uses the buffer distance component to cushion the contact with the area to be cut. Pressing the handle then shortens the buffer distance component, which is then locked in place by a locking component. This prevents direct contact between the plasma cutting head and the area to be cut, avoiding impact. The locking component then locks the buffer distance component in place, ensuring the optimal cutting distance between the plasma cutting head and the area to be cut, thus improving the efficiency and accuracy of underwater cutting of shipwrecks.

[0007] Preferably, the buffer spacing assembly includes a first housing, a groove, a first spring, a cylinder, connecting plates, support plates, rollers, a slider, and a locking hole. The first housing is mounted on the outer housing, and a first spring is mounted at its top. The cylinder is slidably fitted inside the first housing on the outer side of the outer housing. The top of the cylinder is connected to the bottom of the first spring. A groove is provided on the outer wall of the cylinder, and a slider is provided on the inner wall of the first housing, sliding within the groove. Two sets of connecting plates are symmetrically arranged on the outer wall of the cylinder, each set of connecting plates having a support plate at its bottom, and each set of support plates having a roller at its bottom. A locking hole is provided on the cylinder. In the normal state, the first spring extends, thereby causing the cylinder... The cylinder moves downwards inside the first casing. The operator grips the handle to bring the rollers close to the part of the shipwreck to be cut. Once both sets of rollers contact the part, pressing the handle further compresses the first spring, causing the cylinder to move upwards inside the first casing. When the locking hole aligns with the locking component, the locking component inserts into the locking hole, locking the cylinder. Simultaneously, while the rollers contact the part of the shipwreck to be cut, the plasma cutting head maintains the optimal cutting distance. The first spring provides a buffer between the rollers and the shipwreck, preventing collisions and damage to the plasma cutting head in the harsh underwater environment. The locking component also locks the cylinder through the locking hole, maintaining the optimal cutting distance and improving cutting efficiency.

[0008] Preferably, the locking assembly includes a micro switch, a second housing, a second spring, a second insert rod, an indicator light, a second strip opening, and a second lever. The micro switch is embedded in the outer wall of the first housing. The second housing is located outside the first housing. The second spring is located inside the second housing. The second insert rod is slidably mounted inside the second housing, with one end connected to one end of the second spring. The second strip opening is located at the top of the second housing. The second lever is mounted on the second insert rod, and an indicator light is embedded at the top of the second lever. The indicator light is electrically connected to the micro switch. When the operator grips the handle to bring the roller into contact with the part of the sunken ship to be cut, and when the locking hole aligns with the second insert rod, the second insert rod... Under the force of the second spring, the plasma cutting head passes through the locking hole and presses the micro switch, causing the indicator light to illuminate red. The operator, alerted by the red light, knows that the distance between the plasma cutting head and the part of the shipwreck to be cut has been adjusted. The handle is then moved vertically, causing the two sets of rollers to rotate adaptively, allowing the plasma cutting head to cut the part of the shipwreck at the optimal distance. This enables rapid cutting of the shipwreck even in harsh environments. After operation, the operator quickly locates the second lever according to the indicator light's position and pulls it, moving the second lever away from the micro switch and locking hole. This causes the cylinder to move downwards while the indicator light goes out, preparing for the next cut.

[0009] Preferably, the fall arrestor assembly includes a first fixing seat, a pivot pin, a round tube, a third insert rod, a third strip opening, a third lever, a third spring, a second fixing seat, and a rope loop assembly. The outer wall of the handle is respectively provided with a set of first fixing seats and a set of second fixing seats. The round tube is hinged to the first fixing seat via the pivot pin. The second fixing seat has an insertion port. The round tube has a third strip opening. The third insert rod and the third spring are slidably disposed inside the round tube. The third insert rod has a third lever. The third lever passes through the third strip opening, and the rope loop assembly is fitted onto the outside of the third insert rod. In use, the rope loop assembly is fitted onto the outside of the third insert rod, and then the third lever is used to drive the third insert rod into the inside of the round tube. The angle of the round tube is then adjusted with the help of the pivot pin so that the third insert rod aligns with the insertion port. Then, the third insert rod is inserted into the insertion port with the help of the third spring, completing the installation of the rope loop assembly. The operator then puts the other end of the rope loop assembly on their wrist to prevent the handle from falling off and being lost in the dark underwater environment.

[0010] Preferably, the rope assembly includes a wristband, a rope, and a rope body. The first end of the rope is provided with a wristband, and the second end of the rope is provided with a rope body. In use, the rope body is fitted over the outside of the round tube, and the wristband is fitted over the worker's wrist. The worker can flexibly operate the handle with the help of the rope and avoid losing the handle.

[0011] Preferably, it also includes a handle cover, on which the grip is provided; the operator grips the grip with the handle cover to reduce the occurrence of slippage.

[0012] Preferably, it also includes a baffle, which is provided on the round tube; the rope loop body is fitted on the outside of the round tube and is located between the baffle and the second fixing seat. When the third insertion rod separates from the insertion port, the rope loop body can be quickly separated, improving convenience.

[0013] Preferably, it also includes a fluorescent coating, on which the third lever is provided; in dark environments, staff can quickly locate the third lever under the illumination of the fluorescent coating, improving convenience.

[0014] Preferably, the handlebar sleeve is made of rubber.

[0015] Preferably, it also includes a slot and a rotating wheel. The end of the second insertion rod away from the second spring is provided with a slot, and a rotating wheel is rotatably arranged inside the slot. The rotating wheel on the second insertion rod makes rolling contact with the outer wall of the cylinder. When the cylinder is raised or lowered, the rotating wheel rotates adaptively to reduce frictional resistance.

[0016] Compared with the prior art, the beneficial effects of this invention are as follows: In use, the operator connects the outer shell to a standard underwater plasma power system. Then, the operator holds the handle and swims towards the sunken ship. When it is necessary to cut the part of the sunken ship, the operator makes buffer distance component make buffer contact with the part of the sunken ship to be cut, and then presses the handle to shorten the buffer distance component. When the buffer distance component cannot be shortened, the locking component locks the buffer distance component. With the cooperation of the buffer distance component, direct contact between the plasma cutting head and the part of the sunken ship to be cut is avoided, and the plasma cutting head is prevented from impacting. Then, the locking component locks the buffer distance component, ensuring the optimal cutting distance between the plasma cutting head and the part of the sunken ship to be cut, thus improving the efficiency and accuracy of underwater cutting of sunken ships. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the first isometric structure of the present invention; Figure 2 This is an exploded structural diagram of the present invention; Figure 3 This is an enlarged structural diagram of the handle and plasma cutting head, among other components. Figure 4 yes Figure 3 A partially enlarged structural diagram of section A in the middle; Figure 5 It is an enlarged structural diagram of the cylinder and the locating holes, etc. Figure 6 This is an enlarged structural diagram of the No. 1 and No. 2 shells, etc. Figure 7 This is an enlarged structural diagram of the indicator light and the No. 2 plug rod, etc. Figure 8 It is an enlarged structural diagram of the wristband and cylindrical tube, etc. Figure 9 yes Figure 8 A partially enlarged structural diagram of section B in the middle; Figure 10 This is a schematic diagram of the second isometric structure of the present invention.

[0018] In the attached diagram, the markings are as follows: 101, outer casing; 102, plasma cutting head; 103, handle; 104, grip; 201, first casing; 202, slide groove; 203, first spring; 204, cylinder; 205, connecting plate; 206, support plate; 207, roller; 208, slider; 209, locking hole; 301, micro switch; 302, second casing; 303, second spring; 304, second insertion rod; 305, indicator. Lamp; 306, No. 2 strip opening; 307, No. 2 lever; 308, slot; 309, rotating wheel; 401, No. 1 fixing seat; 402, shaft pin; 403, round tube; 404, No. 3 insertion rod; 405, No. 3 strip opening; 406, No. 3 lever; 407, No. 3 spring; 408, No. 2 fixing seat; 409, baffle; 410, fluorescent coating; 501, wrist strap; 502, rope; 503, rope loop body. Detailed Implementation

[0019] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0020] Example 1 like Figures 1 to 10 As shown, an underwater plasma cutting device for shipwreck salvage according to the present invention includes a housing 101, a plasma cutting head 102, and a handle 103. The plasma cutting head 102 is disposed at the bottom end of the housing 101, and the handle 103 is disposed on the housing 101. The device also includes: A buffer spacing assembly, which is mounted on the housing 101, is used to adjust the distance between the handle 103 and the object to be cut; A locking component, which is mounted on the buffer spacing component, is used to lock the buffer spacing component; An anti-drop component is mounted on the handle 103 to prevent the handle 103 from falling off; The buffer spacing assembly includes a first housing 201, a slide 202, a first spring 203, a cylinder 204, a connecting plate 205, a support plate 206, a roller 207, a slider 208, and a locking hole 209. The first housing 201 is mounted on the outer shell 101. A first spring 203 is installed at the top of the first housing 201. The cylinder 204 is slidably fitted inside the first housing 201 on the outside of the outer shell 101. The top of the cylinder 204 is connected to the first spring 203. The bottom end of the spring 203 is connected, the outer wall of the cylinder 204 is provided with a sliding groove 202, the inner wall of the first housing 201 is provided with a slider 208, the slider 208 is slidably disposed inside the sliding groove 202, the outer wall of the cylinder 204 is symmetrically provided with two sets of connecting plates 205, each set of connecting plates 205 is provided with a set of support plates 206 at the bottom end, each set of support plates 206 is provided with a set of rollers 207 at the bottom end, and the cylinder 204 is provided with a locking hole 209; The locking assembly includes a micro switch 301, a second housing 302, a second spring 303, a second insert rod 304, an indicator light 305, a second strip opening 306, and a second lever 307. The micro switch 301 is embedded in the outer wall of the outer housing 101. The second housing 302 is located on the outer side of the first housing 201. The second spring 303 is located inside the second housing 302. The second insert rod 304 is slidably arranged inside the second housing 302. One end of the second insert rod 304 is connected to one end of the second spring 303. The second strip opening 306 is located at the top of the second housing 302. The second lever 307 is located on the second insert rod 304. The indicator light 305 is embedded in the top of the second lever 307. The indicator light 305 is electrically connected to the micro switch 301.

[0021] In this embodiment, during use, the operator connects the outer casing 101 to the standard underwater plasma power system. Then, the operator holds the handle 103 and swims towards the sunken ship. When cutting is required, as the operator grips the handle 103 and the roller 207 contacts the part of the sunken ship to be cut, the locking hole 209 aligns with the second insertion rod 304. Under the elastic force of the second spring 303, the second insertion rod 304 passes through the locking hole 209 and presses the micro switch 301, causing the indicator light 305 to emit a red light. The operator, alerted by the red light, knows that the plasma cutting head 10... 2. After the distance between the plasma cutting head 102 and the part of the shipwreck to be cut is adjusted, the handle 103 is moved vertically, so that the two sets of rollers 207 rotate adaptively, so that the plasma cutting head 102 can cut the part of the shipwreck to be cut at the optimal distance, and achieve rapid cutting of the shipwreck in harsh environments. After the operation is completed, the staff can quickly find the second lever 307 according to the position indicated by the indicator light 305, and pull the second lever 307, so that the second insertion rod 304 is away from the micro switch 301 and the locking hole 209, so that the cylinder 204 moves downward and the indicator light 305 is turned off, preparing for the next cutting.

[0022] Example 2 like Figures 1 to 10 As shown, an underwater plasma cutting device for shipwreck salvage according to the present invention includes a housing 101, a plasma cutting head 102, and a handle 103. The plasma cutting head 102 is disposed at the bottom end of the housing 101, and the handle 103 is disposed on the housing 101. The device also includes: A buffer spacing assembly, which is mounted on the housing 101, is used to adjust the distance between the handle 103 and the object to be cut; A locking component, which is mounted on the buffer spacing component, is used to lock the buffer spacing component; An anti-drop component is mounted on the handle 103 to prevent the handle 103 from falling off; The buffer spacing assembly includes a first housing 201, a slide 202, a first spring 203, a cylinder 204, a connecting plate 205, a support plate 206, a roller 207, a slider 208, and a locking hole 209. The first housing 201 is mounted on the outer shell 101. A first spring 203 is installed at the top of the first housing 201. The cylinder 204 is slidably fitted inside the first housing 201 on the outside of the outer shell 101. The top of the cylinder 204 is connected to the first spring 203. The bottom end of the spring 203 is connected, the outer wall of the cylinder 204 is provided with a sliding groove 202, the inner wall of the first housing 201 is provided with a slider 208, the slider 208 is slidably disposed inside the sliding groove 202, the outer wall of the cylinder 204 is symmetrically provided with two sets of connecting plates 205, each set of connecting plates 205 is provided with a set of support plates 206 at the bottom end, each set of support plates 206 is provided with a set of rollers 207 at the bottom end, and the cylinder 204 is provided with a locking hole 209; The locking assembly includes a micro switch 301, a second housing 302, a second spring 303, a second insert rod 304, an indicator light 305, a second strip opening 306, and a second lever 307. The micro switch 301 is embedded in the outer wall of the outer housing 101. The second housing 302 is located on the outer side of the first housing 201. The second spring 303 is located inside the second housing 302. The second insert rod 304 is slidably arranged inside the second housing 302. One end of the second insert rod 304 is connected to one end of the second spring 303. The second strip opening 306 is located at the top of the second housing 302. The second lever 307 is located on the second insert rod 304. The indicator light 305 is embedded in the top of the second lever 307. The indicator light 305 is electrically connected to the micro switch 301. The fall arrestor assembly includes a first fixed base 401, a pivot pin 402, a round tube 403, a third insert rod 404, a third strip opening 405, a third lever 406, a third spring 407, a second fixed base 408, and a rope sling assembly. The outer wall of the handle 103 is provided with a set of first fixed bases 401 and a set of second fixed bases 408. The round tube 403 is hinged to the first fixed base 401 via the pivot pin 402. The second fixed base 408 has an insertion port. The round tube 403 has a third strip opening 405. The third insert rod 404 and the third spring 407 are slidably disposed inside the round tube 403. The third insert rod 404 has a third lever 406, which passes through the third strip opening 405. The rope sling assembly is fitted over the outside of the third insert rod 404. The rope assembly includes a wristband 501, a rope 502, and a rope body 503. The first end of the rope 502 is provided with the wristband 501, and the second end of the rope 502 is provided with the rope body 503. It also includes a handle cover 104, which is provided on the grip 103; It also includes a baffle 409, which is provided on the circular tube 403; It also includes a fluorescent coating 410, which is provided on the third lever 406; The handlebar grip 104 is made of rubber. It also includes a slot 308 and a rotating wheel 309. The end of the second insertion rod 304 away from the second spring 303 is provided with a slot 308, and the rotating wheel 309 is rotatably arranged inside the slot 308.

[0023] In this embodiment, during use, the operator connects the outer casing 101 to a standard underwater plasma power system. Then, the operator holds the handle 103 and swims towards the sunken ship. When cutting is required, as the operator grips the handle 103 and the rollers 207 contact the part of the sunken ship to be cut, and the locking hole 209 aligns with the second insertion rod 304, the second insertion rod 304, under the elastic force of the second spring 303, passes through the locking hole 209 and presses the micro switch 301, causing the indicator light 305 to emit a red light. The operator, alerted by the red light, knows that the distance between the plasma cutting head 102 and the part of the sunken ship to be cut has been adjusted. The operator then moves the handle 103 vertically, causing the two sets of rollers 207 to rotate adaptively, achieving optimal spacing between the plasma cutting head 102 and the part of the sunken ship to be cut. After the rapid cutting of the shipwreck in harsh conditions is completed, the staff quickly locates the second lever 307 according to the position indicated by the indicator light 305, and pulls the second lever 307 to move the second insertion rod 304 away from the micro switch 301 and the locking hole 209. This causes the cylinder 204 to move downwards while the indicator light 305 goes out, preparing for the next cut. The rope sling assembly is then fitted onto the outside of the third insertion rod 404. Then, the third lever 406 drives the third insertion rod 404 into the inside of the round tube 403. The round tube 403 is then adjusted in angle with the help of the shaft pin 402 so that the third insertion rod 404 coincides with the insertion port. Then, the third insertion rod 404 is inserted into the insertion port with the help of the third spring 407, completing the installation of the rope sling assembly. The staff then puts the other end of the rope sling assembly on their wrist to prevent the handle 103 from falling off and being lost in the dark underwater environment.

[0024] The main functions achieved by this invention are: 1. This patent creatively proposes a "buffered contact followed by rigid locking" operational logic. By linking the buffer spacing component (spring + roller) with the locking component in a specific time sequence, the complex operation of underwater curved surface cutting is simplified into a straightforward process of "pressing until the light illuminates to begin cutting." This completely changes the traditional underwater cutting model, which relies on the operator's "feel" and experience in a "dynamic equilibrium" manner, transforming it into a "static rigid locking" model, thus achieving a paradigm shift from "skill" to "technology." 2. Through the dual-roller contact design in the buffer spacing assembly, the equipment can automatically adapt to the uneven contours of the shipwreck surface. Crucially, when the rollers are compressed to the trigger position, the locking assembly automatically activates, ensuring that the plasma cutting head reaches the preset optimal cutting distance from the workpiece surface. This design, through a purely mechanical method (or a simple electromechanical combination), achieves self-adaptation and high-precision spacing on complex curved surfaces in the harsh underwater environment, solving the core challenge of "maintaining a constant distance." 3. The integrated design of the indicator light and unlock button within the locking component (i.e., indicator light 305 embedded in lever 307) is a highly ingenious human-computer interaction innovation. When the device is locked in place, the indicator light illuminates (e.g., red light), making the status visible; simultaneously, the illuminated position directly indicates the unlocking operation point. The diver can unlock the device by pressing the illuminated lever, at which point the light turns off, forming a closed-loop feedback mechanism. This provides an intuitive and accident-proof interaction method in environments with poor underwater visibility. 4. The fall arrestor is designed with a rotating connection mechanism (circular tube 403, No. 3 insert rod 404) and is equipped with a fluorescent coating. This not only ensures a reliable connection between the equipment and the diver's wrist strap, preventing accidental drops, but more importantly, its insert-lock design (No. 3 insert rod into the socket) allows the diver to quickly release the device in an emergency with a single, decisive action (such as flicking the fluorescent-coated lever), prioritizing personal safety. This demonstrates comprehensive consideration for both human and equipment safety in complex underwater operations.

[0025] The underwater plasma cutting device for shipwreck salvage of the present invention has common mechanical installation, connection or setting methods, and can be implemented as long as it can achieve its beneficial effect; the shell (101), plasma cutting head (102) and handle (103) are used in conjunction with a standard underwater plasma power supply system, which is prior art and will not be described in detail; the shell (101), plasma cutting head (102), micro switch (301) and indicator light (305) of the underwater plasma cutting device for shipwreck salvage of the present invention are commercially available, and technicians in the industry only need to install and operate it according to the accompanying instruction manual, without requiring any creative work from technicians in the field.

[0026] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An underwater plasma cutting device for salvaging sunken ships, comprising a housing (101), a plasma cutting head (102), and a handle (103), wherein the plasma cutting head (102) is disposed at the bottom end of the housing (101), and the handle (103) is disposed on the housing (101), characterized in that, Also includes: A buffer spacing assembly, which is mounted on the housing (101), is used to adjust the distance between the handle (103) and the object to be cut; A locking component, which is mounted on the buffer spacing component, is used to lock the buffer spacing component; An anti-drop component is installed on the handle (103) to prevent the handle (103) from falling off.

2. The underwater plasma cutting equipment for shipwreck salvage as described in claim 1, characterized in that, The buffer spacing assembly includes a first housing (201), a slide (202), a first spring (203), a cylinder (204), a connecting plate (205), a support plate (206), a roller (207), a slider (208), and a locking hole (209). The first housing (201) is provided on the outer shell (101). The first spring (203) is provided at the top inside the first housing (201). The cylinder (204) is slidably fitted on the outer shell (101) inside the first housing (201). The top of the cylinder (204) is connected to the first housing (205). The bottom end of the first spring (203) is connected, the outer wall of the cylinder (204) is provided with a sliding groove (202), the inner wall of the first housing (201) is provided with a slider (208), the slider (208) is slidably arranged inside the sliding groove (202), the outer wall of the cylinder (204) is symmetrically provided with two sets of connecting plates (205), each set of connecting plates (205) is provided with a set of support plates (206) at the bottom end, each set of support plates (206) is provided with a set of rollers (207) at the bottom end, and the cylinder (204) is provided with a locking hole (209).

3. The underwater plasma cutting equipment for shipwreck salvage as described in claim 2, characterized in that, The locking assembly includes a micro switch (301), a second housing (302), a second spring (303), a second insert (304), an indicator light (305), a second strip opening (306), and a second lever (307). The micro switch (301) is embedded in the outer wall of the outer housing (101). A second housing (302) is located on the outer side of the first housing (201). A second spring (303) is located inside the second housing (302). A second insert rod (304) is slidably disposed inside the body (302). One end of the second insert rod (304) is connected to one end of the second spring (303). A second strip-shaped opening (306) is provided at the top of the second housing (302). A second lever (307) is provided on the second insert rod (304). An indicator light (305) is embedded at the top of the second lever (307). The indicator light (305) is electrically connected to the micro switch (301).

4. The underwater plasma cutting equipment for shipwreck salvage as described in claim 1, characterized in that, The fall arrestor assembly includes a first fixing seat (401), a pivot pin (402), a round tube (403), a third insert rod (404), a third strip opening (405), a third lever (406), a third spring (407), a second fixing seat (408), and a rope loop assembly. The outer wall of the handle (103) is respectively provided with a set of first fixing seats (401) and a set of second fixing seats (408). The round tube (403) is connected to the first fixing seat via the pivot pin (402). (401) Hinged, the second fixing seat (408) is provided with a socket, the round tube (403) is provided with a third strip opening (405), the round tube (403) is slidably provided with a third insert rod (404) and a third spring (407), the third insert rod (404) is provided with a third lever (406), the third lever (406) passes through the third strip opening (405), and the rope loop assembly is fitted on the outside of the third insert rod (404).

5. The underwater plasma cutting equipment for shipwreck salvage as described in claim 4, characterized in that, The rope assembly includes a wristband (501), a rope (502), and a rope body (503). The first end of the rope (502) is provided with the wristband (501), and the second end of the rope (502) is provided with the rope body (503).

6. The underwater plasma cutting equipment for shipwreck salvage as described in claim 1, characterized in that, It also includes a grip sleeve (104), which is provided on the grip (103).

7. The underwater plasma cutting equipment for shipwreck salvage as described in claim 4, characterized in that, It also includes a baffle (409), which is provided on the circular tube (403).

8. The underwater plasma cutting equipment for shipwreck salvage as described in claim 4, characterized in that, It also includes a fluorescent coating (410), which is provided on the third lever (406).

9. The underwater plasma cutting equipment for shipwreck salvage as described in claim 6, characterized in that, The grip (104) is made of rubber.

10. The underwater plasma cutting equipment for shipwreck salvage as described in claim 3, characterized in that, It also includes a slot (308) and a rotating wheel (309). The end of the second insertion rod (304) away from the second spring (303) is provided with a slot (308), and a rotating wheel (309) is rotatably provided inside the slot (308).

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