KR20200107052A - Fire-fighting drones with excellent kickback suppression to ensure excellent accuracy - Google Patents

Abstract

The present invention relates to a firefighting drone which launches a firefighting shell (1) to extinguish a fire. The firefighting drone comprises: a fuselage (10) having a frame (11) on which at least four propellers (P) are arranged, and landing legs (12) on both sides of the lower end of the frame (11) to guide landing from the bottom; a firing unit (20) at the center of the lower end of the frame (11) to load a firefighting shell (1) and propel the firefighting shell (1) by compressed air to launch the firefighting shell (1) to a fire point; and a buffer unit (30) which is connected to the firing unit (20) at the center of the lower end of the frame (11), and absorbs the recoil of the firing unit (20) created by launching the firefighting shell (1). Therefore, the present invention suppresses the recoil created by launching the firefighting shell to continuously maintain an aiming position so as to quickly extinguish a fire by continuous launching of firefighting shells and excellent accuracy rates.

Description

Fire-fighting drones with excellent kickback suppression to ensure excellent accuracy.

The present invention relates to a firefighting drone flying over the sky and firing an extinguishing grenade to the point of fire, and more specifically, by suppressing the recoil caused by the firing of the extinguishing grenade, it enables continuous shooting of the aiming position and It relates to a firefighting drone that can be expected to quickly extinguish fire with an excellent accuracy rate.

In general, fire suppression is achieved through injection of extinguishing fluid using a fire engine, and fire suppression is very important because the damage can be greatly reduced according to measures to cope with the initial fire.

However, due to the recent increase in traffic congestion on the road and illegal parking, the initial extinguishing fails as the time required to access the fire engine increases, resulting in increased damage to life and property.

Here, as the construction of high-rise buildings has increased significantly, fire suppression using fire engines has structural limitations, and thus the need for new fire suppression is emerging.

Of course, a method of injecting extinguishing liquid using helicopters and aircraft is used, but since this is a method of spraying extinguishing liquid limited to the outside of the building, there is a problem that the extinguishing liquid is wasted by spraying the extinguishing liquid regardless of the fire source inside the building.

As a way to solve this problem, Korean Patent Publication No. 10-1741578 (name of the invention: fire extinguishing drone capable of firing extinguishing grenade), and Korean Registered Patent Publication No. 10-1804968 (name of the invention: fire extinguishing A drone device with bullet firing function) is proposed.

The former tracks the source of the fire based on photographic data and heat detection data, and fires extinguishers at the source of the fire to delay the propagation of the fire or to extinguish it early. By using an adjustable unmanned aerial vehicle to quickly extinguish a fire, it was possible to minimize the occurrence of secondary damage caused by the fire.

However, when the fire grenade is fired, a reaction occurs in the direction of the launch due to the energy source, which causes the drone's posture to be disturbed and the aiming position to be lost. In other words, it is difficult to expect rapid fire suppression as the firing time of the next fire extinguisher is delayed in order to correct the aiming position.

Therefore, in order to solve this problem, Korean Patent Application Publication No. 10-2018-0066376 (name of invention: fire fighting drone) has been proposed. According to the proposed literature, the recoil is suppressed by injecting compressed air in the opposite direction of the firing direction with the firing of the grenade.

However, there is a problem that energy required for flight is wasted due to an increase in weight by having to incorporate a separate compressed air tank or compressor to suppress the recoil. In addition, it is difficult to control and has a high failure rate because compressed air must be fired with fire extinguishers at an appropriate timing.

Republic of Korea Patent Publication No. 10-1741578 (Name of invention: fire extinguishing drone capable of firing extinguishing grenade) Republic of Korea Patent Publication No. 10-1804968 (Name of invention: Drone device with fire extinguisher launch function) Republic of Korea Patent Publication No. 10-2018-0066376 (name of invention: fire suppression drone)

The present invention was created in order to more actively solve the above problems, and by applying a structure capable of continuously firing fire extinguishers using only compressed air without a separate device, not only low manufacturing cost and maintenance are easy. In addition, by mechanically implementing a buffer structure that can automatically suppress the recoil that occurs when the fire extinguisher is fired, separate control is unnecessary and the frequency of failure is minimized, so that the fire can be quickly extinguished with excellent overall accuracy. It is intended to provide drones, but with that purpose.

In order to achieve the above problem, the configuration of a firefighting drone that guarantees an excellent hit rate with an excellent recoil suppression function proposed by the present invention is as follows.

A firefighting drone that guarantees an excellent hit rate with the excellent recoil suppression function above is a firefighting drone that extinguishes a fire by firing a grenade: a frame in which at least four propellers are arranged, and a landing guide from the floor on both sides of the lower side of the upper frame A body having a landing leg; A trigger unit is loaded with a fire extinguisher in the center of the lower end of the upper frame, and propels the fire extinguisher with compressed air and fires it to the fire point; It characterized in that it comprises a; is connected to the trigger unit in the center of the lower end of the upper frame, a buffer unit that absorbs the recoil of the trigger unit generated by the firing of the fire extinguisher.

At this time, the gas according to the present invention is characterized in that it has a connection unit attached to one end of the frame to induce the detachment and attachment of the percussion unit and the buffer unit.

In addition, the above connection unit according to the present invention includes a fixing bracket integrally attached to the frame, a flow bracket disposed at the bottom of the fixing bracket to be flowable, and an elastic body interposed between the fixing bracket and the flow bracket to absorb impact. And, it is attached to the lower end of the upper flow bracket and characterized in that it is composed of a connecting joint that induces detachment and attachment of the buffer unit.

In addition, the above percussion unit according to the present invention has a percussion barrel that loads a grenade and induces a firing trajectory, a percussion cylinder that is connected to the upper percussion barrel and induces propulsion of the extinguisher, and the inner front of the upper percussion cylinder. It is built-in, and a percussion piston that discharges air through forward/reverse operation to propel fire extinguishers, a valve body that seals the rear of the upper percussion cylinder and supplies high-pressure air to the inside, and a built-in between the upper percussion cylinder and the valve body. It is characterized by having a percussion stem that operates forward and backward by the pressure of the supplied air and delivers compressed air to the percussion piston, and a percussion lever attached to the upper valve body to regulate the forward and backward operation of the percussion stem. do.

In addition, the above percussion barrel according to the present invention is characterized in that a spiral groove for rotating fire extinguishers is formed on the inner surface, and a magazine in which a plurality of fire extinguishers are stacked is attached and detached.

In addition, the percussion cylinder according to the present invention includes a high-pressure chamber in which high-pressure compressed air is supplied, a percussion chamber in which compressed air supplied to the high-pressure chamber expands and is discharged forward, and between the high-pressure chamber and the percussion chamber. A low-pressure chamber for transmitting compressed air is partitioned by the front and rear partition walls, and a flow path for selectively communicating the chambers is formed in the center of the upper and rear partition walls.

In addition, the percussion cylinder according to the present invention is characterized in that a supply groove through which compressed air is introduced is formed in the inner surface of the high-pressure chamber, and a stepped protruding vertically at the center of the outer surface is formed.

In addition, the upper percussion piston according to the present invention has a discharge port that is opened in the center and meshes with the rear of the fire extinguisher, a boss that is sealedly engaged with the inner surface of the percussion chamber on the rear outer surface, and integrally extends in the rear center to A rod that engages with and opens and closes the flow path, and at least one injection port communicating with the discharge port are formed on the outer surface of the rod.

In addition, the valve body according to the present invention is characterized in that a valve pipe extending in communication with the high-pressure chamber is integrally formed at the rear center, and an air tank supplying high-pressure compressed air is connected to the rear.

In addition, the percussion stem according to the present invention includes a valve shaft that opens and closes the flow path by engaging with the rear bulkhead in the front, a valve seat that is sealedly engaged with the inner surface of the high-pressure chamber in the center, and a valve arm inserted into the valve pipe at the rear. It is characterized in that formed by.

In addition, the percussion lever according to the present invention is characterized in that it is composed of a trigger interposed in a direction perpendicular to the inside of the valve tube, and an actuator that is connected to the trigger to open and close the valve tube according to a signal.

In addition, the upper buffer unit according to the present invention is attached to the frame and includes a buffer cylinder that accommodates the percussion unit in an axial direction, a pair of buffer covers that seal the front and rear of the upper buffer cylinder, and the upper buffer cylinder and the buffer cover. It is characterized in that it comprises a pair of buffer springs that are interposed therebetween to absorb the flow of the percussion unit.

According to the present invention having the above-described configuration, the following effects are provided.

First, by implementing the structure of the percussion unit so that fire extinguishers can be continuously fired using only compressed air without a separate device, a high penetration rate can be expected at a low manufacturing cost.

Second, the buffer unit absorbs the recoil of the triggering unit so that the aiming position can be continuously held even after firing, so that rapid fire suppression can be expected with continuous firing and excellent accuracy.

Third, by mechanically implementing the structure of the buffer unit, separate control is unnecessary, and maintenance is easy while minimizing the failure rate, thereby satisfying the needs of users.

Fourth, the connecting unit suppresses the flow generated by the flight along with the recoil of the trigger unit, thereby enabling precise flight, preventing accidents, and allowing access without being restricted by complex terrain or building structures.

1 is a perspective view showing the overall drone for fire fighting according to the present invention.
Figure 2 is a perspective view showing an enlarged main part of the drone for fire fighting according to the present invention.
Figure 3 is a cross-sectional perspective view showing by cutting a part of the main unit according to the present invention.
4 is an exploded view showing the main unit according to the present invention to be separated as a whole.
Figure 5 is a cross-sectional view showing by cutting the center of the main unit according to the present invention.
6 to 11 are detailed views showing an independently enlarged main unit according to the present invention.
12 to 19 are operational state diagrams showing the process of firing a grenade by the drone according to the present invention.

Hereinafter, with reference to the accompanying drawings, the configuration of the present invention, and actions and effects thereof will be described collectively.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to embodiments described later in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in a variety of different forms. However, this embodiment allows the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to those who have, and the invention is only defined by the scope of the claims. In addition, the same reference numerals refer to the same elements throughout the entire specification.

The present invention relates to a firefighting drone that extinguishes a fire by firing an extinguishing grenade 1 to the point of fire while flying in the sky, and the main configuration of the aircraft 10, the firing unit 20, and the buffer unit 30 as shown in FIG. It is a fire fighting drone that guarantees an excellent hit rate with an excellent recoil suppression function.

The main point of the fire fighting drone of the present invention is to suppress the recoil caused by the firing of the fire extinguisher so that the aiming position can be continuously held, and to extinguish the rapid fire with an excellent accuracy rate with continuous firing of the fire extinguisher.

The fire extinguishing grenade 1 is composed of a liquid, gas, or powder type fire extinguishing material, and a shell for sealingly receiving the fire extinguishing material. When an external force exceeding a set range is applied to the shell, it is destroyed and the received fire extinguishing material expands or leaks.

The aircraft 10 is a skeleton constituting a firefighting drone, and includes a frame 11 made of a lightweight metal or resin material as shown in FIG. 1, and a landing leg 12 that guides landing from the floor. Here, at least four propellers P are arranged in the frame 11, and it is preferable to arrange eight propellers P capable of sufficient flight even in adverse conditions.

At this time, at one end of the frame 11, a connection unit 15 that induces attachment and detachment of the percussion unit 20 and the buffer unit 30 to be described later is attached as shown in FIG. 2. The connection unit 15 is composed of a fixing bracket (15a), a flow bracket (15b), an elastic body (16) made of a spring or rubber material, and a connection joint (17).

The fixing bracket (15a) is integrally attached to the frame (11), the flow bracket (15b) is arranged to be flowable in a state spaced apart from the lower end of the fixing bracket (15a). The elastic body 16 is interposed so as to be interconnected between the fixing bracket 15a and the flow bracket 15b to absorb the impact. The connection joint 17 is attached to the lower end of the flow bracket 15b and serves to induce attachment and detachment of the buffer unit 30.

That is, the connection unit 15 induces precise flight by suppressing the flow generated during flight due to the weight including the buffer unit 30 along with the recoil generated from the percussion unit 20.

Here, the connection joint 17 may be divided into two or more adjustment hinges for varying the aiming direction of the percussion unit 20 by rotating in a direction crossing each other, and an adjustment knob for controlling rotation on the adjustment hinge. Of course, the connection joint 17 may be configured with an adjustment motor that automatically changes the aiming direction on the adjustment hinge during flight.

On the other hand, although not shown in a separate drawing, a thermal imaging camera for projecting the interior of a building or identifying a fire point may be attached together with a camera that photographs an image for unmanned control on the frame 10.

The percussion unit 20 serves to propel the fire extinguisher 1, which is disposed in the lower center of the frame 11 and loaded, with compressed air, as shown in FIGS. 1 and 2 and fires it to the fire point. Such a percussion unit 20 is a percussion barrel 21, a percussion cylinder 22, a percussion piston 23, a valve body 24, a percussion stem 25, a percussion lever 26, and return as shown in FIGS. 3 to 5 It consists of a spring 27 and a stopper 28.

The percussion barrel 21 is formed in a tubular shape with a diameter capable of accommodating the fire extinguisher 1 as shown in FIGS. 5 and 6, and the fire extinguisher 1 is loaded therein to guide the firing path to the target point. The percussion barrel 21 may have a spiral groove 21a formed on the inner surface thereof, or a magazine 21b in which a plurality of fire extinguishing bullets 1 are stacked may be detached and attached.

That is, the spiral groove (21a) improves the target hit rate with rotational inertia by rotating the fire extinguisher (1) in the axial direction, and the magazine (21b) has the extinguisher (1) inside the percussion barrel (21). It is automatically loaded to induce continuous fire.

The percussion cylinder 22 is formed in a tubular shape in communication with the percussion barrel 21 as shown in FIGS. 5 and 7 and induces the propulsion of the fire extinguisher 1 loaded in the percussion barrel 21. The percussion cylinder 22 protrudes in a vertical direction at the center of the outer surface to form a stepped jaw 22g meshing with the buffer unit 30. In the percussion cylinder 22, the high-pressure chamber 22a, the low-pressure chamber 22c, and the percussion chamber 22b are partitioned from the rear to the front by the front and rear partition walls 22d.

The high-pressure chamber (22a) is a space where high-pressure compressed air is supplied, the percussion chamber (22b) is a space in which the supplied compressed air is expanded and discharged forward, and the low-pressure chamber (22c) is the compressed air of the high-pressure chamber (22a). It is a space for transmitting the percussion chamber 22b.

Here, in the front and rear partition walls 22d, a flow path 22e for selectively communicating the chambers 22a, 22b, and 22c is formed in the center. Further, a supply groove 22f through which compressed air is introduced is formed on the inner surface of the high-pressure chamber 22a. That is, the compressed air passes through the chambers 22a, 22b, and 22c through the flow path 22e and causes the fire extinguishing grenade 1 to be fired, and this action will be described through an operation process described later.

The percussion piston 23 is formed in a U-shaped cross-section as shown in FIGS. 5 and 8 to perform a ball role, and is built in front of the percussion cylinder 21 to propel the fire extinguisher (1). The percussion piston 23 is composed of a discharge port 23a, a boss 23b, a rod 23c, and an injection port 23d.

The discharge port (23a) is opened in the center in the axial direction and is engaged with the rear of the fire extinguisher (1), the boss (23b) is sealedly engaged with the inner surface of the percussion chamber (22b) on the rear outer surface, and the rod (23c) is rearward. It extends integrally in the center and engages with the front partition wall 22d to open and close the flow path 22e, and the injection port 23d is formed in communication with the discharge port 23a on the outer surface of the rod 23c.

In other words, the percussion piston 23 is built in the interior front of the percussion cylinder 22 and discharges compressed air by forward/reverse operation by compressed air supplied to propel the extinguishing grenade 1, which will be described later. I will explain through the operation process.

The valve body 24 is a cover attached to the percussion cylinder 22 as shown in FIGS. 5 and 9, and seals the rear of the percussion cylinder 22 and supplies high-pressure air to the inside. The valve body 24 is integrally formed with a valve tube 24a extending in communication with the high pressure chamber 22a at the rear center. Then, an air tank 24b for supplying high-pressure compressed air to the high-pressure chamber 22a is attached to the rear.

The percussion stem 25 is built between the percussion cylinder 22 and the valve body 24 as shown in FIGS. 5 and 10 to deliver compressed air to the percussion piston 23. In this percussion stem 25, the valve shaft 25a, the valve seat 25b, and the valve arm 25c are sequentially integrated from the front to the rear. The valve shaft 25a engages with the rear partition wall 22d to open and close the flow path 22e, the valve seat 25b is sealedly engaged with the inner surface of the high pressure chamber 22a, and the valve arm 25c is a valve tube 24a. Is inserted into

In other words, the percussion stem 25 intermittently continuously transmits the compressed air supplied to the percussion piston 23 through the forward/reverse operation by the compressed air supplied inside the percussion cylinder 22. This will be explained through the operation process described later.

The percussion lever 26 is attached to the valve body 24 as shown in FIGS. 5 and 9 to regulate the forward/reverse operation of the percussion stem 25. The percussion lever 26 includes a trigger 26a interposed in a direction perpendicular to the inside of the valve tube 24a, and an actuator 26b that is connected to the trigger 26a so that the valve tube 24a is opened and closed according to a signal. ).

Here, the trigger 26b performs an operation to descend so that the valve tube 24a is always closed, and when a firing signal is input from the wireless controller, the actuator 26b raises the trigger 26b to open the valve tube 24a. .

The rest of the return spring 27 is built in front of the percussion cylinder 22 to add elasticity to the percussion piston 23 to add a return force, and the stopper 28 is built in the inner front of the percussion cylinder 22. Limits the advance distance of the triggered piston (23).

The buffer unit 30 is connected to the firing unit 20 in the lower center of the frame 11 as shown in FIGS. 1 and 2 and absorbs the recoil of the firing unit 20 generated by the firing of the fire extinguisher 1 Do it. This buffer unit 30 is composed of a buffer cylinder 31 and a pair of buffer covers 32 and a buffer spring 33 as shown in FIGS. 3 to 5 and 11.

The buffer cylinder 31 is detachably attached to the connection joint 17, and accommodates the percussion unit 20 so as to flow in the axial direction. The shock absorbing cover 32 is sealedly coupled to the front and rear in the state in which the percussion unit 20 is embedded, and the shock absorbing spring 33 is interposed on the front and rear sides of the percussion cylinder 22 based on the stepped jaws (22g), respectively. (20) to absorb the flow.

That is, the buffer unit 30 accommodates the percussion unit 20 so that it can flow in the axial direction and adds elasticity, so that the recoil acting by firing the extinguishing grenade 1 causes the percussion unit 20 to retreat and advance. It is repeated and canceled to block transmission to the frame 11.

Hereinafter, a process in which the firefighting drone according to the present invention launches a fire extinguisher (1) will be described as follows.

First, the drone approaches the fire point by remote control or automatic control while flying in the air, and takes the aiming position toward the fire point targeting the trigger unit 20. Here, since the valve seat 25b is located in the supply groove 22f as shown in FIG. 12, the high-pressure chamber 22a is filled with all of the high-pressure air from the air tank 24b.

When the aiming is completed and the firing signal is applied, the actuator 26b seals the valve tube 24a and dents the trigger 26a that used to restrain the valve arm 25c, as shown in FIG. 13. When the restraint of the valve arm 25c is released due to the depression of the trigger 26a, the percussion stem 25 is automatically moved backward by air pressure as shown in FIG. 14.

Due to the retraction of the percussion stem 25, the valve shaft 25a opens the flow path 22e of the rear bulkhead 22d, and the high-pressure compressed air filled in the high pressure chamber 22a by opening the flow path 22e is atmospheric pressure. It is instantaneously moved to the low pressure chamber 22c in the state.

The compressed air moved to the low pressure chamber 22c advances the percussion piston 23 together with the return spring 27 as shown in FIG. 15, and the rod 23c moves forward of the front partition wall 22d as the percussion piston 23 advances. The flow path 22e is opened.

With the opening of the flow path 22e of the front partition wall 22d, the compressed air of high pressure is injected into the percussion chamber 22b, and the compressed air blocked by the boss 23b is switched to the injection port 23d and moved to the discharge port 23a. Flow in. The compressed air introduced into the discharge port 23a fires the fire extinguisher 1 loaded in the percussion barrel 21 forward as shown in FIG. 16.

Here, the moment the extinguishing grenade 1 is fired, recoil occurs backward, and the trigger unit 20 moves backward from the buffer unit 30 as shown in FIG. 17. When the buffer unit 30 absorbs all the reaction force, the percussion unit 20 returns to its original position.

At the same time, after the fire extinguisher 1 is fired, the compressed air in the chambers 22a, 22b, and 22c is extinguished and converted to atmospheric pressure, and the valve seat 25b is reversed by the percussion stem 25 as shown in FIG. ) Has a state in which the rear of the high-pressure chamber 22c is sealed off from the supply groove 22f.

In this state, the high-pressure compressed air supplied from the air tank 24b advances the percussion stem 25 again, and the valve shaft 25a moves forward through the flow path 22e of the rear partition wall 22d. Is sealed.

Finally, the trigger 26a automatically protrudes and closes the valve tube 24a to restrain the reverse movement of the valve arm 25c. This operation process has been described step by step for explanation, but the actual operation is instantaneous.

On the other hand, when a signal is continuously applied to the actuator 26b to keep the trigger 26a in a depressed state at all times, the percussion stem 25 continuously moves forward and backward, and fires the fire extinguishing grenade 1 continuously.

As described above, the present invention implements the structure of the percussion unit to continuously fire fire extinguishing grenade using only compressed air without a separate device, so that a high penetration rate can be expected at low manufacturing cost. In addition, the buffer unit absorbs the recoil of the triggering unit so that the aiming position can be continuously held even after firing, so that rapid fire suppression can be expected with an excellent accuracy rate along with continuous firing.

In addition, since the structure of the buffer unit is mechanically implemented, separate control is unnecessary, and maintenance is easy while minimizing the failure rate, thereby satisfying the needs of users. In addition, as the connecting unit suppresses the flow generated by the flight along with the recoil of the trigger unit, precise flight is possible, preventing accidents and allowing access without being restricted by complex terrain or building structures.

1: fire grenade P: propeller
10: body 11: frame
12: landing leg 15: connection unit
15a: fixing bracket 15b: floating bracket
16: elastic body 17: connection joint
20: triggered unit 21: triggered barrel
21a: spiral groove 21b: magazine
22: percussion cylinder 22a: high pressure chamber
22b: percussion chamber 22c: low pressure chamber
22d: front and rear bulkhead 22e: euro
22f: supply groove 22g: stepped
23: percussion piston 23a: discharge port
23b: Boss 23c: Rod
23d: inlet 24: valve body
24a: valve pipe 24b: air tank
25: percussion stem 25a: valve shaft
25b: valve seat 25c: valve arm
26: percussion lever 26a: trigger
26b: actuator 27: return spring
28: stopper 30: buffer unit
31: buffer cylinder 32: buffer cover
33: buffer spring

Claims (3)

In a firefighting drone that fires a grenade (1) to extinguish a fire:
A frame 11 in which at least four or more propellers P are arranged, and a body 10 provided with landing legs 12 for inducing landing from the bottom on both lower sides of the upper frame 11;
A fire extinguisher (1) is loaded in the center of the lower end of the upper frame (11), a trigger unit (20) for propelling the extinguisher (1) with compressed air and firing it to the fire point;
A buffer unit 30 connected to the percussion unit 20 at the lower center of the upper frame 11 and absorbing the recoil of the percussion unit 20 generated by the firing of the fire extinguisher 1 above;
A firefighting drone that guarantees an excellent hit rate with an excellent recoil suppression function, characterized in that comprising a.
The method of claim 1,
The above percussion unit (20) is connected to the percussion barrel (21) to induce the firing trajectory by loading the grenade (1), and the percussion cylinder to induce the propulsion of the extinguisher (1) and connected in communication with the above percussion barrel (21) (22) And, a percussion piston (23) that is built in front of the inside of the upper percussion cylinder (21) and discharges air by forward/reverse operation to propel the extinguisher (1), and the rear of the upper percussion cylinder (22). It is sealed and built-in between the valve body 24 that supplies high-pressure air to the inside, and the upper percussion cylinder 22 and the valve body 24, and operates forward and backward by the pressure of the supplied air, and the percussion piston ( 23), and a percussion stem 25 that transmits compressed air to the percussion stem 25, and a percussion lever 26 attached to the upper valve body 24 to regulate the forward/reverse operation of the percussion stem 25. A firefighting drone that guarantees an excellent hit rate with a recoil suppression function.
The method of claim 1,
The buffer unit 30 is attached to the frame 11 and is a buffer cylinder 31 that accommodates the percussion unit 20 so as to flow in the axial direction, and a pair of buffers that seal the front and rear of the buffer cylinder 31. Excellent recoil suppression, characterized in that it comprises a cover 32 and a pair of buffer springs 33 interposed between the upper buffer cylinder 31 and the buffer cover 32 to absorb the flow of the percussion unit 20 A firefighting drone that guarantees excellent accuracy by function.

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