A protective structure for a launch tube, a life-saving thrower, and a method of use.

Abstract

This invention discloses a protective structure for a launch tube, a life-saving thrower, and a method of use. The structure includes a launch tube body and a protective mechanism. The protective mechanism comprises a protective cylinder, a docking seat, transmission rods, a cover plate, and a linkage unit. The protective cylinder is slidably fitted onto the outside of the launch tube. The docking seat is fixed to the launch tube body near the launch port. Two transmission rods are radially and symmetrically mounted on the protective cylinder. The two ends of the cover plate are rotatably connected to the two transmission rods. The linkage unit is located between the docking seat and the cover plate. When the protective cylinder is moved outwards or inwards, the linkage unit drives the cover plate to cover or open the launch port. In this invention, the protective cylinder is used to install the cover plate and provide power to the linkage unit. The linkage unit controls the movement of the cover plate, thereby enabling the cover plate to cover the launch port of the launch tube body, preventing debris from entering the launch tube body, improving reliability, and reducing maintenance costs.

Description

Technical Field

[0001] This invention relates to the field of lifesaving equipment technology, specifically to a projectile tube protective structure, a lifesaving thrower, and a method of use. Background Technology

[0002] During the operation of a hydroelectric power station, patrol personnel are deployed to inspect the waterway for three main purposes: inspecting hydraulic structures and identifying potential structural hazards; monitoring reservoir water levels; and detecting floating debris. Due to the large water area, the monitoring station is equipped with rescue throwers to facilitate timely rescue should someone fall into the water. As a crucial piece of portable rescue equipment, the rescue thrower's core function is to accurately throw a rescue projectile, secured with a rescue rope, to the vicinity of the person trapped in the water, providing them with a grip. Rescuers then use the rope to quickly transfer and rescue the person. Existing rescue throwers typically use projectile-shaped projectiles with tubular launching mechanisms. The projectile is placed directly inside the tubular launch tube and propelled by compressed air or other power sources from the tube end to complete the throwing action. However, since the tube end lacks any protective structure, it is usually directly exposed to the external environment. This allows dust, mud, and other debris to easily enter the tube, causing dirt accumulation inside. This dirt adheres to the inner wall of the tube, and over time, it wears down the inner wall structure, compromising the tube's sealing performance. Especially for pneumatic rescue throwers, dirt can also affect the connection and seal between the cylinder and the launch tube, leading to power source leakage, reduced throwing power, and decreased throwing effectiveness. Furthermore, dirt accumulation increases maintenance costs, requiring regular cleaning of the tube's internal cavity. Therefore, based on practical experience, we have made improvements to the existing rescue thrower. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a protective structure for a projectile tube, which can cover the projectile port of the projectile tube body with a cover plate to prevent foreign objects from entering the projectile tube body, thereby improving reliability and reducing maintenance costs.

[0004] Another technical problem to be solved by the present invention is to provide a rescue thrower that adopts the aforementioned projectile tube protection structure.

[0005] The third technical problem to be solved by the present invention is to provide a method for using a projectile tube protection structure.

[0006] To achieve the above-mentioned technical features, the objective of this invention is as follows: In a first aspect, the present invention proposes a protective structure for a projectile tube, comprising a projectile tube body and a protective mechanism, wherein the protective mechanism comprises a protective cylinder, a docking seat, transmission rods, a cover plate, and a linkage unit; the protective cylinder is slidably sleeved on the outside of the protective cylinder, the docking seat is fixed on the projectile tube body at one end near the projectile port, two transmission rods are radially and symmetrically mounted on the protective cylinder, and the two ends of the cover plate are rotatably connected to the two transmission rods respectively; the linkage unit is disposed between the docking seat and the cover plate; When the protective cylinder is moved outward or inward, the cover plate is driven by the linkage unit to cover or open the ejection port.

[0007] The linkage unit includes a fixed block and rotating wheels. The fixed block is vertically fixed on the docking seat, and the two rotating wheels are respectively fixed at both ends of the cover plate. The two rotating wheels are rotatably connected to the transmission rods on both sides. The rotating wheels are in contact with the fixed block for transmission. When the transmission rods move along the axial direction of the ejector tube body, they drive the cover plate to cover or open the ejection port.

[0008] The fixed block is equipped with a rack structure, and the rotating wheel is equipped with a gear structure. The gear structure meshes with the rack structure for transmission.

[0009] The cover plate has an arc-shaped structure and a spherical outer wall. A spherical cavity is provided at one end of the inner wall of the protective cylinder near the ejection port. The two ends of the cover plate are rotatably connected to the end of the transmission rod that extends into the protective cylinder. The cover plate can swing along the transmission rod in the spherical cavity.

[0010] The cover plate has an clearance groove on its inner side.

[0011] It also includes a limiting mechanism; the limiting mechanism includes a support base, a guide rod, and a limiting rod; one end of the guide rod is slidably connected to one end of the support base, and the other ends of the guide rod and the support base are respectively connected and fixed to the docking seat and the transmission rod; a limiting groove is provided on the side wall of the support base, one end of the limiting rod is fixedly connected to the guide rod, and the other end is a free end that extends into the limiting groove; the limiting rod is elastic; the position of the cover plate is limited by the engagement of the limiting rod at different positions in the limiting groove.

[0012] The limiting groove is a rectangular groove provided along the length of the support base; a first slot is provided at the bottom of the limiting groove, a first inclined surface is provided on the upper side of the first slot, a second inclined surface is provided at the top of the limiting groove, and a second slot is provided on the lower side of the second inclined surface; a protrusion is provided at the bottom of the limiting groove located between the second slot and the second inclined surface, and a slope is provided on the side of the protrusion away from the second inclined surface.

[0013] A return spring is fitted on the guide rod, and a chuck is fixed on the guide rod. One end of the return spring is fixed to the chuck, and the other end is fixed to the bottom of the support base.

[0014] Secondly, the present invention also provides a life-saving thrower that employs the aforementioned projectile tube protection structure.

[0015] Thirdly, the present invention also provides a method of using the aforementioned projectile tube protection structure, comprising the following steps: When the cover plate is in the state of blocking the ejection port, the protective cylinder is close to the ejection port, the free end of the limiting rod is located in the first slot, and the return spring is in an extended state with a certain elastic force. When the launch port needs to be opened, stabilize the launch tube body and move the protective cylinder away from the launch port. During this process, after the free end of the limiting rod abuts against the first inclined surface, it moves to the left side into the left groove and then abuts against the top left side of the limiting groove. The return spring is compressed, and after the free end of the limiting rod abuts against the top of the limiting groove, the protective cylinder is limited. At this time, the protective cylinder is released, the return spring pushes the support seat upward, and the free end of the limiting rod enters the second slot, limiting the protective cylinder. At the same time, the protective cylinder drives the linkage unit to move, and the linkage unit drives the cover plate to flip to one side of the launch tube body, thereby opening the launch port. When the launch port needs to be covered, stabilize the launch tube body and move the protective cylinder away from the launch port. During this process, after the free end of the limiting rod abuts against the second inclined surface, it moves to the right and springs into the right groove from the protrusion. At this time, release the protective cylinder, and the protective cylinder moves towards the launch port side under the action of the return spring until the free end of the limiting rod enters the first slot. At the same time, the protective cylinder drives the linkage unit to move, and through the linkage unit, it drives the cover plate to flip to the end of the launch tube body, thereby covering the launch port.

[0016] Compared with the prior art, the beneficial effects of the present invention include: 1. The protective cylinder of this invention is used to install the cover plate and provide power to the linkage unit. The linkage unit is used to control the movement of the cover plate. When the transmission rods on both sides move upward with the protective cylinder, the rotating wheel rotates counterclockwise, thereby driving the cover plate to rotate counterclockwise. When the cover plate rotates 90° counterclockwise, it covers the launch port. Then, when the transmission rods on both sides move downward with the protective cylinder, the rotating wheel rotates clockwise, thereby driving the cover plate to rotate clockwise. When the cover plate rotates 90° clockwise, it opens the launch port. This allows the launch port of the launch tube body to be covered by the cover plate, preventing debris from entering the launch tube body, improving reliability, and reducing maintenance costs.

[0017] 2. The projectile tube protection structure of the present invention also includes a limiting mechanism, which restricts the position of the cover plate, thereby allowing the cover plate to stop at the corresponding position. Through the cooperation of the limiting mechanism and the linkage unit, the cover plate can be stably positioned in two shielded and open positions.

[0018] 3. The protective mechanism in this invention effectively protects the projectile tube. The protective cylinder is slidably sleeved on the outside of the projectile tube, and the cover plate has an arc-shaped structure and is tightly attached to the inner wall of the protective cylinder, which further improves the protective sealing performance and effectively prevents external dust, mud, and other impurities from entering the projectile tube. It also prevents the projectile from being directly exposed to the external environment, ensuring the integrity of the projectile surface and the cleanliness of the projectile tube cavity, thus improving the reliability and service life of the equipment. The linkage unit enables synchronous linkage between the cover plate and the protective cylinder, thereby achieving rapid opening and closing of the cover plate. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the life-saving throwing device of the present invention.

[0021] Figure 2 This is a schematic diagram of the protective structure for the projectile tube of the present invention.

[0022] Figure 3 This is a schematic diagram of the cover plate in the protective structure of the projectile tube of the present invention.

[0023] Figure 4 This is a schematic diagram of the linkage unit in the projectile tube protection structure of the present invention.

[0024] Figure 5 This is a schematic diagram of the first state of the limiting mechanism in the projectile tube protection structure of the present invention.

[0025] Figure 6 This is a schematic diagram of the second state of the limiting mechanism in the projectile tube protection structure of the present invention.

[0026] In the picture: Projectile tube body 1; Projectile port 2; Protective mechanism 3, protective cylinder 31, docking seat 32, fixing block 33, transmission rod 34, cover plate 35, clearance groove 351, rotating wheel 36; Limiting mechanism 4, support base 41, guide rod 42, limiting rod 43, limiting groove 44, return spring 45; First slot 441, first inclined surface 442, left side slot 443, ramp 444, protrusion 445, second slot 446, second inclined surface 447, right side slot 448, return spring 45; Support frame 5. Detailed Implementation

[0027] To more clearly illustrate the purpose, technical solution, and beneficial effects of this application, a further detailed description of this application is provided below in conjunction with illustrations and specific embodiments. It should be specifically noted that the specific embodiments described below are only for illustrating the technical content of this application and do not constitute a limitation on the scope of protection of this application.

[0028] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0029] In the description of this invention, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating a connection between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection via an intermediate medium; it can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] Example 1: like Figures 1-4 As shown, a protective structure for a projectile tube includes a projectile tube body 1 and a protective mechanism 3. The protective mechanism 3 includes a protective cylinder 31, a docking seat 32, transmission rods 34, a cover plate 35, and a linkage unit. The protective cylinder 31 is slidably sleeved on the outside of the protective cylinder 31. The docking seat 32 is fixed on the projectile tube body 1 near the projectile port 2. Two transmission rods 34 are radially and symmetrically installed on the protective cylinder 31. The two ends of the cover plate 35 are rotatably connected to the two transmission rods 34, respectively. The linkage unit is located between the docking seat 32 and the cover plate 35. When the protective cylinder 31 is moved outward or inward, the linkage unit drives the cover plate 35 to cover or open the projectile port 2.

[0031] The protective cylinder 31 is used to install the cover plate 35 and provide power to the linkage unit; the linkage unit is used to control the movement of the cover plate 35, so that the cover plate 35 can cover the ejection port 2 of the ejection tube body 1, prevent debris from entering the ejection tube body 1, improve reliability, and reduce maintenance costs.

[0032] See Figure 2 The linkage unit includes a fixed block 33 and two rotating wheels 36. The fixed block 33 is vertically fixed on the docking seat 32, and the two rotating wheels 36 are respectively fixed at both ends of the cover plate 35. The two rotating wheels 36 are rotatably connected to the transmission rods 34 on both sides. The rotating wheels 36 contact the fixed block 33 for transmission. When the transmission rods 34 move along the axial direction of the projectile tube body 1, they drive the cover plate 35 to cover or open the projectile port 2. In this embodiment, the rotating wheels 36 abut against the fixed block 33, and the transmission between the rotating wheels 36 and the fixed block 33 is achieved through friction.

[0033] Combination Figure 2 When the drive rods 34 on both sides move upward with the protective cylinder 31, the rotating wheel 36 rotates counterclockwise, thereby driving the cover plate 35 to rotate counterclockwise. When the cover plate 35 rotates 90° counterclockwise, it covers the ejection port 2. Then, when the drive rods 34 on both sides move downward with the protective cylinder 31, the rotating wheel 36 rotates clockwise, thereby driving the cover plate 35 to rotate clockwise. When the cover plate 35 rotates 90° clockwise, it opens the ejection port 2.

[0034] In this embodiment, the cover plate 35 has an arc-shaped structure and a spherical outer wall. A spherical cavity is provided at one end of the inner wall of the protective cylinder 31 near the ejection port 2. Both ends of the cover plate 35 are rotatably connected to the ends of the transmission rod 34 that extend into the protective cylinder 31, allowing the cover plate 35 to swing within the spherical cavity along the transmission rod 34. This structure enables the cover plate 35 to be installed on the inner wall of the protective cylinder 31, ensuring the flexibility of its movement.

[0035] Further, see Figure 3 The cover plate 35 has an avoidance groove 351 on its inner side, which can further reduce the height of the cover plate 35 and make the structure more compact.

[0036] Example 2: In this embodiment, the linkage unit includes a fixed block 33 and two rotating wheels 36. The fixed block 33 is vertically fixed on the docking seat 32, and the two rotating wheels 36 are respectively fixed at both ends of the cover plate 35. The fixed block 33 adopts a rack and pinion structure, and the outer circumference of the rotating wheels 36 adopts a gear structure. The gear structure meshes with the rack and pinion structure for transmission, thereby making the transmission more stable and reliable.

[0037] Example 3: Based on Example 1 or Example 2, see Figure 2 , 5 6. The protective structure of the projectile tube also includes a limiting mechanism 4, which limits the position of the cover plate 35 so that the cover plate 35 can stop in the corresponding position. Specifically, see Figure 5 , 6The limiting mechanism 4 includes a support base 41, a guide rod 42, and a limiting rod 43. One end of the guide rod 42 is slidably inserted into one end of the support base 41, and the other ends of the guide rod 42 and the support base 41 are respectively connected and fixed to the docking seat 32 and the transmission rod 34. A limiting groove 44 is provided on the side wall of the support base 41. One end of the limiting rod 43 is fixed to the guide rod 42, and the other end is a free end that extends into the limiting groove 44. The limiting rod 43 is elastic, and the position of the cover plate 35 is limited by the engagement of the free end of the limiting rod 43 at different positions in the limiting groove 44.

[0038] In this embodiment, the limiting rod 43 is an elastic metal rod with vertical bends at both ends. One bend is fixed to the bottom of the guide rod 42, and the other bend is the free end. The limiting groove 44 is a rectangular groove along the length of the support base 41. The bottom of the limiting groove 44 has a first slot 441, the upper side of the first slot 441 has a first inclined surface 442, the top of the limiting groove 44 has a second inclined surface 447, and the lower side of the second inclined surface 447 has a second slot 446. A protrusion 445 is located at the bottom of the limiting groove 44 between the second slot 446 and the second inclined surface 447, and a slope 444 is provided on the side of the protrusion 445 away from the second inclined surface 447. By moving the free end of the limiting rod 43 into the first slot 441 and the second slot 446, the cover plate 35 is limited in both states.

[0039] Additionally, a protrusion 445 is provided at the bottom of the limiting groove 44 located between the second slot 446 and the second inclined surface 447, and a ramp 444 is provided on the side of the protrusion 445 away from the second inclined surface 447. By providing the ramp 444, the free end of the limiting rod 43 can easily move onto the protrusion 445 between the second slot 446 and the second inclined surface 447. The height of the bottom of the protrusion 445 is higher than the height of the bottom of the right slot 448. When the support base 41 moves downwards, see... Figure 6 The free end of the limiting rod 43 abuts against the second inclined surface 447. At this time, the second inclined surface 447 pushes the free end of the limiting rod 43 to the right, so that the free end of the limiting rod 43 enters the upper part of the right groove 448. Since the height of the bottom of the protrusion 445 is higher than the height of the bottom of the right groove 448, the free end of the limiting rod 43 is elastically locked into the right groove 448 under its own elastic force, so as to ensure that when the support base 41 moves upward, the free end of the limiting rod 43 can slide in the right groove 448 without getting stuck.

[0040] Furthermore, a return spring 45 is fitted onto the guide rod 42, and a chuck is fixed to the guide rod 42. One end of the return spring 45 is fixed to the chuck, and the other end is fixed to the bottom of the support base 41. By setting the return spring 45, the stability of the cover plate 35 after being positioned is ensured.

[0041] Example 4: Based on Example 1, 2, or 3, see [link to example]. Figure 1 This embodiment also provides a rescue thrower that employs the aforementioned projectile tube protection structure. For example, it can be applied to a long-range rescue thrower disclosed in CN201670353U; specifically, the projectile tube protection structure can be installed at the end of the launch tube. See also... Figure 1 Alternatively, a support frame 5 can be installed at the end of the outer casing to provide stable support for the entire device and improve ease of operation.

[0042] Example 5: This embodiment proposes a method for using a projectile tube protection structure in Embodiment 3, including the following steps: When the cover plate 35 is in the state of blocking the ejection port 2, the protective cylinder 31 is close to the ejection port 2, and the free end of the limiting rod 43 is located in the first slot 441. Figure 5 As shown, the return spring 45 is in an extended state with a certain elastic force at this time.

[0043] When the ejection port 2 needs to be opened, stabilize the ejection tube body 1 and move the protective cylinder 31 away from the ejection port 2. During this process, after the free end of the limiting rod 43 abuts against the first inclined surface 442, it moves to the left into the left groove 443, and then abuts against the top left side of the limiting groove 44. The return spring 45 is compressed. After the free end of the limiting rod 43 abuts against the top of the limiting groove 44, the protective cylinder 31 is limited. At this time, the protective cylinder 31 is released, the return spring 45 pushes the support base 41 upward, and the free end of the limiting rod 43 passes through the inclined surface 444 and enters the protrusion 445, and then enters the second slot 446, limiting the protective cylinder 31. At the same time, the protective cylinder 31 drives the linkage unit to move, combined with Figure 2 When the protective cylinder 31 moves to the left, then combined with Figure 3 The protective cylinder 31 drives the transmission rods 34 on both sides to move accordingly. Figure 3 When the transmission rod 34 moves downward, the rotating wheel 36 rotates clockwise, thereby driving the cover plate 35 to rotate clockwise. When the cover plate 35 rotates 90° clockwise, the cover plate 35 opens the ejection port 2.

[0044] When the launch port 2 needs to be shielded, stabilize the launch tube body 1 and move the protective cylinder 31 away from the launch port 2, in conjunction with... Figure 5During this process, the free end of the limiting rod 43 abuts against the second inclined surface 447, moves to the right, and springs from the protrusion 445 into the right groove 448. At this time, the protective cylinder 31 is released, and under the action of the return spring 45, the protective cylinder 31 moves towards the ejection port 2 until the free end of the limiting rod 43 enters the first slot 441. Simultaneously, the protective cylinder 31 drives the linkage unit to operate, combined with... Figure 3 At this time, the transmission rod 34 moves upward and the rotating wheel 36 rotates counterclockwise, thereby driving the cover plate 35 to rotate counterclockwise. When the cover plate 35 rotates 90° counterclockwise, the cover plate 35 flips to the end of the ejection tube body 1, thereby covering the ejection port 2.

[0045] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims. Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A protective structure for a projectile tube, comprising a projectile tube body (1), characterized in that: It also includes a protective mechanism (3), which includes a protective cylinder (31), a docking seat (32), a transmission rod (34), a cover plate (35), and a linkage unit; the protective cylinder (31) is slidably sleeved on the outside of the protective cylinder (31), the docking seat (32) is fixed on the end of the projectile tube body (1) near the projectile port (2), the two transmission rods (34) are installed radially and symmetrically on the protective cylinder (31), and the two ends of the cover plate (35) are rotatably connected to the two transmission rods (34); the linkage unit is set between the docking seat (32) and the cover plate (35); When the protective cylinder (31) is moved outward or inward, the cover plate (35) is driven by the linkage unit to cover or open the ejection port (2).

2. The projectile tube protection structure according to claim 1, characterized in that: The linkage unit includes a fixed block (33) and a rotating wheel (36). The fixed block (33) is vertically fixed on the docking seat (32). The two rotating wheels (36) are respectively fixed at both ends of the cover plate (35). The two rotating wheels (36) are rotatably connected to the transmission rods (34) on both sides. The rotating wheel (36) is in contact with the fixed block (33) for transmission. When the transmission rod (34) moves along the axial direction of the projectile tube body (1), it drives the cover plate (35) to cover or open the projectile port (2).

3. The projectile tube protection structure according to claim 2, characterized in that: The fixed block (33) is provided with a rack structure, and the rotating wheel (36) is provided with a gear structure. The gear structure meshes with the rack structure for transmission.

4. The projectile tube protection structure according to claim 1, characterized in that: The cover plate (35) has an arc-shaped structure and a spherical outer wall. The inner wall of the protective cylinder (31) is provided with a spherical cavity at one end near the ejection port (2). The two ends of the cover plate (35) are respectively rotatably connected to one end of the transmission rod (34) that extends into the protective cylinder (31). The cover plate (35) can swing along the transmission rod (34) in the spherical cavity.

5. The projectile tube protection structure according to claim 4, characterized in that: The cover plate (35) has an clearance groove (351) on its inner side.

6. The protective structure for a projectile tube according to claim 1, characterized in that: It also includes a limiting mechanism (4); the limiting mechanism (4) includes a support base (41), a guide rod (42) and a limiting rod (43); one end of the guide rod (42) is slidably connected to one end of the support base (41), and the other ends of the guide rod (42) and the support base (41) are respectively connected and fixed to the docking seat (32) and the transmission rod (34); a limiting groove (44) is provided on the side wall of the support base (41), one end of the limiting rod (43) is fixedly connected to the guide rod (42), and the other end is a free end that extends into the limiting groove (44); the limiting rod (43) is elastic; the position of the cover plate (35) is limited by the engagement of the limiting rod (43) at different positions in the limiting groove (44).

7. The projectile tube protection structure according to claim 6, characterized in that: The limiting groove (44) is a rectangular groove provided along the length direction of the support base (41); the bottom of the limiting groove (44) is provided with a first slot (441), the upper side of the first slot (441) is provided with a first inclined surface (442), the top of the limiting groove (44) is provided with a second inclined surface (447), and the lower side of the second inclined surface (447) is provided with a second slot (446); the bottom of the limiting groove (44) located between the second slot (446) and the second inclined surface (447) is provided with a protrusion (445), and the side of the protrusion (445) away from the second inclined surface (447) is provided with a slope (444).

8. The projectile tube protection structure according to claim 7, characterized in that: A reset spring (45) is fitted on the guide rod (42), and a chuck is fixed on the guide rod (42). One end of the reset spring (45) is fixed to the chuck, and the other end is fixed to the bottom of the support base (41).

9. A life-saving throwing device, characterized in that: The projectile tube protection structure described in any one of claims 1 to 8 is adopted.

10. A method of using the projectile tube protection structure according to claim 8, characterized in that: Includes the following steps: When the cover plate (35) is in the state of blocking the ejection port (2), the protective cylinder (31) is close to the ejection port (2), the free end of the limiting rod (43) is located in the first slot (441), and the reset spring (45) is in an extended state with a certain elastic force. When the ejection port (2) needs to be opened, stabilize the ejection tube body (1) and move the protective cylinder (31) away from the ejection port (2); during this process, after the free end of the limiting rod (43) abuts against the first inclined surface (442), it moves to the left side into the left groove (443) and then abuts against the top left side of the limiting groove (44); the return spring (45) is compressed, and after the free end of the limiting rod (43) abuts against the top of the limiting groove (44), the protective cylinder (31) is limited. At this time, the protective cylinder (31) is released, the return spring (45) pushes the support seat (41) upward, and the free end of the limiting rod (43) enters the second slot (446) to limit the protective cylinder (31); at the same time, the protective cylinder (31) drives the linkage unit to move, and drives the cover plate (35) to flip to one side of the ejection tube body (1) through the linkage unit, thereby opening the ejection port (2); When the launch port (2) needs to be covered, stabilize the launch tube body (1) and move the protective cylinder (31) away from the launch port (2). During this process, after the free end of the limiting rod (43) abuts against the second inclined surface (447), it moves to the right and springs from the protrusion (445) into the right groove (448). At this time, release the protective cylinder (31). Under the action of the return spring (45), the protective cylinder (31) moves to the side of the launch port (2) until the free end of the limiting rod (43) enters the first slot (441). At the same time, the protective cylinder (31) drives the linkage unit to move, and through the linkage unit, the cover plate (35) is driven to flip to the end of the launch tube body (1), thereby covering the launch port (2).

Images