Water and foam dual-mode switching ship fire monitor runner structure
By designing a ship fire monitor flow channel structure with dual-mode switching of water and foam, the problem of single function of traditional fire monitors is solved, and rapid mode switching and spray range adjustment are achieved to meet the needs of complex fire scenarios.
Patent Information
- Application Number
- CN202510870356.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-26
- Publication Date
- 2025-09-23
AI Technical Summary
Traditional ship fire monitors have a single function and cannot meet the needs of complex and changing fire scenarios. They cannot spray water and foam at the same time.
A ship fire monitor flow channel structure with dual-mode switching of water and foam is designed. The water monitor flow channel and the foam monitor flow channel are staggered opened through a switching mechanism. Combined with the supporting mechanism and the adjusting mechanism, it allows for rapid switching of the spray mode and adjustment of the spray range and angle.
It achieves rapid switching between water and foam spray modes, expands the adjustment capability of the spray range, and meets the needs of changing fire scenarios.
Smart Images

Figure CN120679116A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of ship fire-fighting equipment, and in particular relates to a ship fire-fighting monitor flow channel structure with dual-mode switching of water and foam. Background Art
[0002] During operation, ships face various fire risks, such as oil fires caused by fuel leaks, electrical fires caused by electrical equipment failures, and ordinary solid fires caused by cargo burning. In order to effectively deal with these fires, ships are usually equipped with fire monitors as important fire-fighting equipment.
[0003] Traditional ship fire monitors often have relatively simple functions, either only spraying water or only spraying foam, which makes it difficult to meet the needs of complex and changing fire scenarios. Summary of the Invention
[0004] In view of the above situation, in order to overcome the defects of the existing technology, the present invention provides a ship fire monitor flow channel structure with dual-mode switching of water and foam, which effectively solves the current problem that it is difficult to switch between water and foam modes to meet the needs of complex and changeable fire scenarios.
[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a water and foam dual-mode switchable flow channel structure for a ship fire monitor, comprising a monitor body, a handrail fixedly connected to the outside of the monitor body, a bracket mounted on the outside of the monitor body, a switching mechanism provided on the monitor body, and a supporting mechanism and an adjusting mechanism provided on the outside of the monitor body;
[0006] The switching mechanism includes a main liquid pipe fixed to the inside of the gun body, and the outside of the main liquid pipe is symmetrically fixedly connected with a water inlet pipe and a foam inlet pipe, and the ends of the water inlet pipe and the foam inlet pipe away from the main liquid pipe extend to the outside of the gun body, and an inner disk is fixedly installed inside the gun body, and the inner disk is fixedly sleeved on the outside of the main liquid pipe, and the outside of the inner disk is symmetrically fixedly connected with a water monitor flow channel and a foam monitor flow channel, and the sides of the water monitor flow channel and the foam monitor flow channel close to each other are fixedly connected with side pipes, an intermediate pipe is provided between the two side pipes, a hose 1 is fixedly connected between the intermediate pipe and the main liquid pipe, and bellows are fixedly connected between the two side pipes and the intermediate pipe, and sealing disks are provided inside the two side pipes, one of the sealing disks is fitted with one of the side pipes, and the other sealing disk is not fitted with the other side pipe, and a translation rod is fixedly connected between the two sealing disks, and the translation rod passes through the intermediate pipe and the two bellows, and a sleeve block is fixedly connected to the inside of the intermediate pipe, and the sleeve block is fixedly sleeved on the outside of the translation rod.
[0007] Preferably, a guide plate is fixedly installed on the outside of the intermediate tube, two guide rods are fixedly connected between the water cannon flow channel and the foam cannon flow channel, the guide plate is movably sleeved between the two guide rods, a bottom block is fixedly installed inside the gun body, the top of the bottom block is rotatably connected to a rotating shaft, an outer disk is fixedly sleeved on the outside of the rotating shaft, the top of the outer disk is rotatably connected to a movable rod, the end of the movable rod away from the outer disk is rotatably connected to the top of the guide plate, the top of the gun body is fixedly connected to a top block, and the top of the rotating shaft passes through the top block and is fixedly connected to an operating handle.
[0008] Preferably, the outer side of the rotating shaft is movably connected to a lifting plate located between the top block and the operating handle, a spring is fixedly connected between the lifting plate and the operating handle, a spring set is arranged on the outer side of the rotating shaft, the top of the lifting plate is fixedly connected to a push rod, the top end of the push rod passes through the operating handle and is fixedly connected to a U-shaped round rod.
[0009] Preferably, the top of the top block is fixedly connected with positioning rod 1 and positioning rod 2, the top ends of positioning rod 1 and positioning rod 2 are provided with limiting holes, the lifting plate abuts against positioning rod 2, and the U-shaped round rod is inserted into the corresponding limiting hole.
[0010] Preferably, the support mechanism includes an outer ring fixed to the outside of the gun body, two support shafts are symmetrically fixedly connected to the outside of the outer ring, and the ends of the two support shafts away from the outer ring are rotatably connected to the inner side of the bracket, two L-shaped round rods are symmetrically fixedly connected between the outer ring and the gun body, a movable ring is movably sleeved between the two L-shaped round rods, the movable ring abuts against the bracket, and two springs are symmetrically fixedly connected between the movable ring and the outer ring, and the two springs are respectively sleeved on the outside of the two L-shaped round rods.
[0011] Preferably, two side rods are symmetrically fixedly connected to the outer side of the bracket, and the movable ring is sleeved on the outer sides of the two side rods.
[0012] Preferably, the outer side of the movable ring is fixedly connected to a connecting column, the end of the connecting column away from the movable ring is fixedly connected to a movable frame, the movable frame is movably sleeved on the outer side of the armrest, and the inner side of the movable frame is fixedly connected to a grip rod.
[0013] Preferably, the adjustment mechanism includes a turntable located outside the gun body, a drive shaft is fixedly connected to the side of the turntable close to the gun body, and a drive motor is fixedly connected to the end of the drive shaft away from the turntable. The drive motor is fixed to the outside of the gun body, and a water monitor nozzle and a foam monitor nozzle are symmetrically fixedly connected to the turntable. A hose 2 is fixedly connected between the water monitor nozzle and the water monitor flow channel, and between the foam monitor nozzle and the foam monitor flow channel.
[0014] Preferably, two limiting posts are symmetrically fixedly connected to one side of the turntable close to the gun body, and the ends of the two limiting posts away from the turntable are both provided with limiting balls that abut against the gun body.
[0015] Compared with the prior art, the present invention has the following beneficial effects:
[0016] 1. The present invention facilitates the horizontal movement of the two sealing discs through the cooperation among the operating handle, the rotating shaft, the outer disc, the movable rod, the guide plate, the guide rod, the intermediate tube, the sleeve block and the translation rod, so that one of the sealing discs is in contact with one of the side tubes and the other sealing disc is not in contact with the other side tube. Moreover, through the cooperation among the lifting plate, the first spring, the rotating shaft, the push rod, the operating handle, the U-shaped round rod and the limiting hole, the two sealing discs can be fixed after movement, and then the water monitor flow channel and the foam monitor flow channel can be staggered opened, thereby facilitating the rapid switching between the water and foam spraying dual modes.
[0017] 2. The invention facilitates the detachment of the movable ring from the outside of the two side rods through the cooperation between the grip rod, movable frame, handrail, connecting column, movable ring, L-shaped round rod, outer ring and spring 2, thereby releasing the fixation between the outer ring and the bracket, and facilitates the rotation of the gun body to adjust the tilt angle through the cooperation between the outer ring and the support shaft, thereby facilitating the adjustment of the spray range of the entire ship fire monitor.
[0018] 3. The invention facilitates the stable circular rotation of the water monitor nozzle and the foam monitor nozzle through the coordination between the driving motor, the driving shaft, the turntable, the limiting column and the limiting ball, thereby facilitating the adjustment of the spray angle of the entire ship fire monitor. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.
[0020] In the attached figure:
[0021] Figure 1 This is a schematic diagram of the flow channel structure of the ship fire monitor with dual-mode switching of water and foam according to the present invention;
[0022] Figure 2 This is a schematic diagram of the cross-sectional structure of the gun barrel of the present invention;
[0023] Figure 3 This is a schematic diagram of the switching mechanism structure of the present invention;
[0024] Figure 4 This is a schematic diagram of the top block structure of the present invention;
[0025] Figure 5 This is a schematic diagram of the cross-sectional structure of the intermediate tube of the present invention;
[0026] Figure 6 This is a schematic diagram of the support mechanism structure of the present invention;
[0027] Figure 7 It is a schematic diagram of the structure of the adjustment mechanism of the present invention.
[0028] In the figure: 1, gun body; 2, switching mechanism; 201, main liquid pipe; 202, water inlet pipe; 203, inner plate; 204, side pipe; 205, bellows; 206, water monitor flow channel; 207, guide rod; 208, top block; 209, movable rod; 2010, guide plate; 2011, foam monitor flow channel; 2012, outer plate; 2013, rotating shaft; 2014, bottom block; 2015, middle pipe; 2016, hose 1; 2017, foam inlet pipe; 2018, positioning rod 1; 2019, positioning rod 2; 2020, lifting plate; 2021, top rod; 2022, U-shaped round rod; 2023, limit Position hole; 2024, operating handle; 2025, spring one; 2026, translation rod; 2027, sleeve block; 2028, sealing disk; 3, support mechanism; 301, outer ring; 302, support shaft; 303, side rod; 304, movable ring; 305, connecting column; 306, movable frame; 307, grip rod; 308, L-shaped round rod; 309, spring two; 4, adjustment mechanism; 401, turntable; 402, limit column; 403, limit ball; 404, drive motor; 405, hose two; 406, drive shaft; 407, water monitor nozzle; 408, foam monitor nozzle; 5, bracket; 6, handrail. DETAILED DESCRIPTION
[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.
[0030] Embodiment 1, by Figure 1-Figure 7 The present invention relates to a flow channel structure of a ship fire monitor with dual-mode switching of water and foam, comprising a monitor body 1, a handrail 6 fixedly connected to the outside of the monitor body 1, a bracket 5 installed on the outside of the monitor body 1, a switching mechanism 2 provided on the monitor body 1, and a supporting mechanism 3 and an adjusting mechanism 4 provided on the outside of the monitor body 1;
[0031] Embodiment 2, on the basis of embodiment 1, the switching mechanism 2 includes a main liquid pipe 201 fixed to the inside of the gun body 1, the outer side of the main liquid pipe 201 is symmetrically fixedly connected with a water inlet pipe 202 and a foam inlet pipe 2017, the ends of the water inlet pipe 202 and the foam inlet pipe 2017 away from the main liquid pipe 201 are extended to the outside of the gun body 1, the inside of the gun body 1 is fixedly installed with an inner disk 203, the inner disk 203 is fixedly sleeved on the outer side of the main liquid pipe 201, the outer side of the inner disk 203 is symmetrically fixedly connected with a water monitor flow channel 206 and a foam monitor flow channel 2011, the side of the water monitor flow channel 206 and the foam monitor flow channel 2011 close to each other are fixedly connected with a side pipe 204, an intermediate pipe 2015 is provided between the two side pipes 204, and the intermediate pipe 2015 is provided between the two side pipes 204. A hose 2016 is fixedly connected between 015 and the main liquid pipe 201, and a bellows 205 is fixedly connected between the two side pipes 204 and the middle pipe 2015. A sealing disk 2028 is provided inside the two side pipes 204, one of which is in contact with one of the side pipes 204, and the other sealing disk 2028 is not in contact with the other side pipe 204. A translation rod 2026 is fixedly connected between the two sealing disks 2028, and the translation rod 2026 passes through the middle pipe 2015 and the two bellows 205. A sleeve block 2027 is fixedly connected to the inside of the middle pipe 2015, and the sleeve block 2027 is fixedly sleeved on the outside of the translation rod 2026. A guide plate 2028 is fixedly installed on the outside of the middle pipe 2015. 010, two guide rods 207 are fixedly connected between the water cannon flow channel 206 and the foam cannon flow channel 2011, and the guide plate 2010 is movably sleeved between the two guide rods 207. A bottom block 2014 is fixedly installed inside the gun body 1, and the top of the bottom block 2014 is rotatably connected to the rotating shaft 2013. The outer side of the rotating shaft 2013 is fixedly sleeved with an outer disk 2012, and the top of the outer disk 2012 is rotatably connected to the movable rod 209. The end of the movable rod 209 away from the outer disk 2012 is rotatably connected to the top of the guide plate 2010, and the top of the gun body 1 is fixedly connected to the top block 208. The top of the rotating shaft 2013 passes through the top block 208 and is fixedly connected to the operating handle 2024. The outer side of the rotating shaft 2013 is movably sleeved with A lifting plate 2020 is located between the top block 208 and the operating handle 2024. A spring 1 2025 is fixedly connected between the lifting plate 2020 and the operating handle 2024. The spring 1 2025 is sleeved on the outside of the rotating shaft 2013. The top of the lifting plate 2020 is fixedly connected to a push rod 2021. The top of the push rod 2021 passes through the operating handle 2024 and is fixedly connected to a U-shaped round rod 2022. The top of the top block 208 is fixedly connected to a positioning rod 1 2018 and a positioning rod 2 2019. The tops of the positioning rod 1 2018 and the positioning rod 2 2019 are both provided with limiting holes 2023. The lifting plate 2020 abuts against the positioning rod 2 2019, and the U-shaped round rod 2022 is inserted into the corresponding limiting holes 2023.
[0032] First, pull the U-shaped round rod 2022 upwards, and drive the lifting plate 2020 to slide upward along the rotating shaft 2013 through the top rod 2021. At this time, the spring 1 2025 is compressed, and then the operating handle 2024 is rotated to drive the rotating shaft 2013 to rotate, and drive the outer disk 2012 to rotate, and drive the guide plate 2010 to slide along the two guide rods 207 through the movable rod 209, and then drive the intermediate tube 2015 to move horizontally, and then drive the translation rod 2026 to move through the sleeve block 2027. At the same time, the two sealing disks 2028 move until one of the sealing disks 2028 is aligned with it. One of the side tubes 204 fits with the other sealing disk 2028, and the other sealing disk 2028 does not fit with the other side tube 204. At this time, the operating handle 2024 abuts against the positioning rod 2 2019 or the positioning rod 1 2018, and then the U-shaped round rod 2022 is released. At this time, the spring 1 2025 resets and drives the lifting plate 2020 to slide downward along the rotating shaft 2013, and drives the U-shaped round rod 2022 to descend through the top rod 2021 until the U-shaped round rod 2022 is inserted into the corresponding limit hole 2023, thereby fixing the positions of the two sealing disks 2028, and finally quickly realizing the switching between water and foam spraying dual modes.
[0033] Example 3, based on Example 1, the support mechanism 3 includes an outer ring 301 fixed to the outside of the gun body 1, and two support shafts 302 are symmetrically fixedly connected to the outside of the outer ring 301. The ends of the two support shafts 302 away from the outer ring 301 are both rotatably connected to the inner side of the bracket 5. Two L-shaped round rods 308 are symmetrically fixedly connected between the outer ring 301 and the gun body 1. A movable ring 304 is movably sleeved between the two L-shaped round rods 308. The movable ring 304 abuts against the bracket 5, and the movable ring 304 is connected to the outer ring 301. Two springs 309 are symmetrically fixedly connected, and the two springs 309 are respectively sleeved on the outside of the two L-shaped round rods 308. The outside of the bracket 5 is symmetrically fixedly connected to two side rods 303. The movable ring 304 is sleeved on the outside of the two side rods 303. The outside of the movable ring 304 is fixedly connected to a connecting column 305. The end of the connecting column 305 away from the movable ring 304 is fixedly connected to a movable frame 306. The movable frame 306 is movably sleeved on the outside of the handrail 6. The inside of the movable frame 306 is fixedly connected to a grip rod 307.
[0034] First, pull the grip 307 to drive the movable frame 306 to slide along the armrest 6, and drive the movable ring 304 to slide along the two L-shaped round rods 308 through the connecting column 305. At this time, the two springs 2 309 are stretched until the movable ring 304 is disengaged from the two side rods 303, releasing the fixation between the outer ring 301 and the bracket 5. Since the two support shafts 302 are rotatably connected to the bracket 5, the armrest 6 can be held to rotate the gun body 1 to adjust the tilt angle, thereby adjusting the spray range of the entire ship fire monitor. When the entire ship fire monitor is not in use, the movable ring 304 can be sleeved on the outside of the two side rods 303 under the action of the elastic force of the two springs 2 309, fixing the outer ring 301 to the bracket 5, and finally supporting the gun body 1.
[0035] Embodiment 4, on the basis of embodiment 1, the adjustment mechanism 4 includes a turntable 401 located outside the gun body 1, a drive shaft 406 is fixedly connected to the side of the turntable 401 close to the gun body 1, and a drive motor 404 is fixedly connected to the end of the drive shaft 406 away from the turntable 401, and the drive motor 404 is fixedly connected to the outside of the gun body 1. A water monitor nozzle 407 and a foam monitor nozzle 408 are symmetrically fixedly connected to the turntable 401, and a hose 2 405 is fixedly connected between the water monitor nozzle 407 and the water monitor flow channel 206, and between the foam monitor nozzle 408 and the foam monitor flow channel 2011. Two limiting posts 402 are symmetrically fixedly connected to the side of the turntable 401 close to the gun body 1, and the ends of the two limiting posts 402 away from the turntable 401 are provided with limiting balls 403 that abut against the gun body 1;
[0036] First, start the drive motor 404 to drive the drive shaft 406 to rotate, and then drive the turntable 401 to rotate. At the same time, the two limit balls 403 are driven to roll on the gun body 1 through the two limit columns 402 to ensure the stability of the turntable 401 during rotation, so that the water monitor nozzle 407 and the foam monitor nozzle 408 can rotate stably in a circle. Finally, the spray angle of the entire ship fire monitor is adjusted.
Claims
1. A water and foam dual-mode switchable ship fire monitor flow channel structure, comprising a gun body (1), characterized in that: The outer side of the gun body (1) is fixedly connected to a handrail (6), the outer side of the gun body (1) is installed with a bracket (5), the gun body (1) is provided with a switching mechanism (2), and the outer side of the gun body (1) is provided with a supporting mechanism (3) and an adjusting mechanism (4); The switching mechanism (2) comprises a main liquid pipe (201) fixed inside the gun body (1); a water inlet pipe (202) and a foam inlet pipe (2017) are symmetrically fixedly connected to the outside of the main liquid pipe (201); the water inlet pipe (202) and the foam inlet pipe (2017) are both extended to the outside of the gun body (1) at one end away from the main liquid pipe (201); an inner disk (203) is fixedly installed inside the gun body (1); the inner disk (203) is fixedly sleeved on the outside of the main liquid pipe (201); a water monitor flow channel (206) and a foam monitor flow channel (2011) are symmetrically fixedly connected to the outside of the inner disk (203); the water monitor flow channel (206) and the foam monitor flow channel (2011) are both fixedly connected to the side of each other on the side where the water monitor flow channel (206) and the foam monitor flow channel (2011) are close to each other; an intermediate pipe (204) is provided between the two side pipes (204); and an intermediate pipe (2015) is provided between the two side pipes (204). A hose 1 (2016) is fixedly connected between the intermediate tube (2015) and the main liquid tube (201); a bellows (205) is fixedly connected between the two side tubes (204) and the intermediate tube (2015); a sealing disk (2028) is provided inside the two side tubes (204); one sealing disk (2028) is in contact with one of the side tubes (204), and the other sealing disk (2028) is not in contact with the other side tube (204); a translation rod (2026) is fixedly connected between the two sealing disks (2028); the translation rod (2026) passes through the intermediate tube (2015) and the two bellows (205); a sleeve block (2027) is fixedly connected inside the intermediate tube (2015); and the sleeve block (2027) is fixedly sleeved on the outside of the translation rod (2026).
2. The flow channel structure of a ship fire monitor with dual-mode switching of water and foam according to claim 1 is characterized in that: A guide plate (2010) is fixedly installed on the outer side of the intermediate tube (2015); two guide rods (207) are fixedly connected between the water monitor flow channel (206) and the foam monitor flow channel (2011); the guide plate (2010) is movably sleeved between the two guide rods (207); a bottom block (2014) is fixedly installed inside the gun body (1); the top of the bottom block (2014) is rotatably connected to a rotating shaft (2013); the outer side of the rotating shaft (2013) is fixedly sleeved with an outer disk (2012); the top of the outer disk (2012) is rotatably connected to a movable rod (209); one end of the movable rod (209) away from the outer disk (2012) is rotatably connected to the top of the guide plate (2010); the top of the gun body (1) is fixedly connected to a top block (208); the top of the rotating shaft (2013) passes through the top block (208) and is fixedly connected to an operating handle (2024).
3. The flow channel structure of a ship fire monitor with dual-mode switching of water and foam according to claim 2 is characterized in that: The outer side of the rotating shaft (2013) is movably sleeved with a lifting plate (2020) located between the top block (208) and the operating handle (2024); a spring (2025) is fixedly connected between the lifting plate (2020) and the operating handle (2024); the spring (2025) is sleeved on the outer side of the rotating shaft (2013); the top of the lifting plate (2020) is fixedly connected with a push rod (2021); the top end of the push rod (2021) passes through the operating handle (2024) and is fixedly connected with a U-shaped round rod (2022).
4. The flow channel structure of a ship fire monitor with dual-mode switching of water and foam according to claim 2 is characterized in that: The top of the top block (208) is fixedly connected to a positioning rod 1 (2018) and a positioning rod 2 (2019), and the tops of the positioning rod 1 (2018) and the positioning rod 2 (2019) are both provided with a limiting hole (2023), the lifting plate (2020) is in contact with the positioning rod 2 (2019), and the U-shaped round rod (2022) is inserted into the corresponding limiting hole (2023).
5. The flow channel structure of a ship fire monitor with dual-mode switching of water and foam according to claim 1 is characterized in that: The support mechanism (3) comprises an outer ring (301) fixed to the outside of the gun body (1); two support shafts (302) are symmetrically fixedly connected to the outside of the outer ring (301); one end of the two support shafts (302) away from the outer ring (301) is rotatably connected to the inside of the bracket (5); two L-shaped round rods (308) are symmetrically fixedly connected between the outer ring (301) and the gun body (1); a movable ring (304) is movably sleeved between the two L-shaped round rods (308); the movable ring (304) is in contact with the bracket (5); two springs (309) are symmetrically fixedly connected between the movable ring (304) and the outer ring (301); the two springs (309) are respectively sleeved on the outside of the two L-shaped round rods (308).
6. The flow channel structure of a ship fire monitor with dual-mode switching of water and foam according to claim 1, characterized in that: Two side rods (303) are symmetrically fixedly connected to the outer side of the bracket (5), and the movable ring (304) is sleeved on the outer sides of the two side rods (303).
7. The water and foam dual-mode switchable flow channel structure for ship fire monitors according to claim 5, characterized in that: The outer side of the movable ring (304) is fixedly connected to a connecting column (305), one end of the connecting column (305) away from the movable ring (304) is fixedly connected to a movable frame (306), the movable frame (306) is movably sleeved on the outer side of the handrail (6), and the inner side of the movable frame (306) is fixedly connected to a grip rod (307).
8. The water and foam dual-mode switchable ship fire monitor flow channel structure according to claim 1, characterized in that: The regulating mechanism (4) comprises a rotating disk (401) located outside the gun body (1); a driving shaft (406) is fixedly connected to a side of the rotating disk (401) close to the gun body (1); an end of the driving shaft (406) away from the rotating disk (401) is fixedly connected to a driving motor (404); the driving motor (404) is fixed to the outside of the gun body (1); a water monitor nozzle (407) and a foam monitor nozzle (408) are symmetrically fixedly connected to the rotating disk (401); and a hose 2 (405) is fixedly connected between the water monitor nozzle (407) and the water monitor flow channel (206), and between the foam monitor nozzle (408) and the foam monitor flow channel (2011).
9. The water and foam dual-mode switchable ship fire monitor flow channel structure according to claim 8, characterized in that: Two limiting posts (402) are symmetrically fixedly connected to one side of the turntable (401) close to the gun body (1), and the ends of the two limiting posts (402) away from the turntable (401) are both provided with limiting balls (403) that abut against the gun body (1).