A bomb throwing device for fire-fighting drone

Abstract

The present invention discloses a projectile throwing device for a firefighting drone, comprising a launching tube and an ejection tube that are coaxially fixedly connected. An electromagnet 1 is arranged in the launching tube, and an electromagnet 2 and an electromagnet 3 are arranged in the ejection tube. The electromagnet 1 and the electromagnet 2 are fixedly connected via a connecting rod. The electromagnet 3 is energized to attract the electromagnet 2 to approach, and drives the electromagnet 1 to slide axially in the launching tube to approach the ejection tube. Beneficial effect: The projectile throwing device of the firefighting drone of the present application uses electromagnetic drive to launch fire extinguishing bombs. While launching the fire extinguishing bombs, the projectile throwing device sprays air in the opposite direction of the launch, and uses the gas recoil principle to balance the recoil force received by the projectile throwing device when launching the fire extinguishing bomb, so as to achieve the technical effect that the projectile throwing device can launch the fire extinguishing bomb steadily. When launching the fire extinguishing bomb, the drone does not shake, and the projectile trajectory is accurate and does not deviate, so it can accurately hit the glass and quickly extinguish the fire.

Description

Technical Field

[0001] The invention relates to the field of unmanned aerial vehicles, and in particular to a bomb throwing device for a fire-fighting unmanned aerial vehicle. Background Art

[0002] With the development of social economy, there are more and more high-rise buildings in cities, and fire trucks are not competent for high-rise fire fighting. Therefore, fire-fighting drones have been developed and gradually applied to high-rise fire fighting.

[0003] However, the balconies or building facades of high-rise buildings are generally installed with glass, and the fire point is located indoors. The glass is difficult to be quickly removed or opened for the fire-fighting bombs launched by fire-fighting drones to enter the room. Therefore, the fire-fighting bombs launched by drones now generally have the function of breaking windows to extinguish fires, that is, the fire-fighting bombs launched by drones can smash the glass and enter the room to explode and extinguish the fire. Most fire-fighting bombs rely on the sharp warhead to hit the glass at high speed to smash the glass, and the warhead does not explode at the same time. This requires that the trajectory of the fire-fighting bombs launched by drones must be accurate and correct, and the warhead of the fire-fighting bomb accurately avoids the metal frame area on the window and hits the glass, otherwise the fire-fighting bomb has the risk of not breaking the window or suddenly exploding when breaking the window. When the drone is hovering in the air and firing the fire-fighting bomb at the window, the huge recoil will cause the drone to shake violently, and seriously cause the drone to fall. The shaking of the drone causes the trajectory of the fire-fighting bomb to easily deviate and fail to accurately hit the glass. Therefore, how to ensure that the drone can stably launch the fire-fighting bomb in the hovering state is a difficult problem that technicians in this field need to solve urgently. Summary of the invention

[0004] The main purpose of the present invention is to propose a bomb throwing device for a fire-fighting drone, which aims to solve the problem that when the existing drone is hovering in the air and firing fire-extinguishing bombs at the window, the huge recoil force can easily cause the fuselage to shake violently, which can seriously cause the drone to fall. The violent shaking of the fuselage can easily cause the trajectory of the fire-extinguishing bomb to deviate, making it impossible to accurately hit the glass, making it difficult to quickly extinguish the fire.

[0005] In order to solve the above problems, the present invention proposes a projectile throwing device for a fire-fighting drone, comprising a launching tube and an ejection tube which are coaxially fixedly connected, wherein an electromagnet 1 is arranged in the launching tube, and an electromagnet 2 and an electromagnet 3 are arranged in the ejection tube, wherein the electromagnet 1 and the electromagnet 2 are fixedly connected via a connecting rod, and the electromagnet 3 is energized to attract the electromagnet 2 to approach, and drives the electromagnet 1 to slide axially in the launching tube to approach the ejection tube;

[0006] A high-pressure gas tank is arranged at one end of the ejection tube away from the launch tube, and a control valve is arranged on the high-pressure gas tank, and an air jet pipe is connected to the control valve, and the air jet direction of the air jet pipe coincides with the sliding direction of the electromagnet 1 in the launch tube when the electromagnet 3 is energized to attract the electromagnet 2 to approach;

[0007] The ejection tube is suspended at the lower end of the first lifting rope, the launching tube is suspended at the lower end of the second lifting rope, and the upper end of the second lifting rope is connected with an electric hoist.

[0008] In one embodiment, a cover plate 1 is provided at the connection between the launch tube and the ejection tube, and the interiors of the launch tube and the ejection tube are separated from each other by the cover plate 1;

[0009] The connecting rod is coaxial with the launching tube and the ejection tube, and the connecting rod axially slides through the cover plate one.

[0010] The material of the launching tube and the cover plate is metal.

[0011] In one embodiment, a threading hole 1 is provided on the wall of the launching tube at one end close to the ejection tube.

[0012] In one embodiment, the electromagnet three is fixedly installed in the ejection tube at one end away from the launching tube, and a threading hole three is provided on the ejection tube at one end away from the launching tube.

[0013] In one embodiment, a slide cylinder is tightly sleeved outside the second electromagnet, and the slide cylinder slides axially against the inner wall of the ejection cylinder. A straight slide groove extending along the axial direction of the ejection cylinder is provided on the cylinder wall of the ejection cylinder, and a slider is slidably installed in the slide groove, one end of the slider is fixedly connected to the slide cylinder, and the other end of the slider passes through the slide groove and extends out of the ejection cylinder;

[0014] A mounting ring is coaxially fixedly mounted on the outer wall of the ejection tube close to one end of the launching tube, and a pressure sensor is mounted on the mounting ring. A spring is coaxially sleeved outside the ejection tube, and one end of the spring is connected to the pressure sensor. When the slider slides along the slide groove and approaches the launching tube, it contacts the other end of the spring and squeezes the spring.

[0015] In one embodiment, a second threading hole is disposed in the slider, and the second threading hole extends from one end of the slider to the other end of the slider.

[0016] In one embodiment, a buffer pad is provided on the side of the electromagnet 2 that contacts the electromagnet 3.

[0017] In one embodiment, a cover plate 2 is detachably fixedly mounted on one end of the ejection tube away from the launching tube, and the high-pressure gas tank is fixedly connected to the cover plate 2.

[0018] In one embodiment, the electromagnet does not contact the inner wall of the launching tube.

[0019] In one embodiment, a laser rangefinder is provided on the outer wall of the ejection tube and the launching tube. When the ejection tube and the launching tube are suspended by the first and second hanging ropes and kept horizontal, the laser rangefinder emits laser vertically upward.

[0020] Beneficial effect: The bomb-throwing device of the fire-fighting drone of the present application adopts electromagnetic drive to launch fire-extinguishing bombs. While launching the fire-extinguishing bombs, the bomb-throwing device sprays air in the opposite direction of the launching, and uses the gas recoil principle to balance the recoil force received by the bomb-throwing device when launching the fire-extinguishing bombs, thereby achieving the technical effect of the bomb-throwing device stably launching the fire-extinguishing bombs. When launching the fire-extinguishing bombs, the drone does not shake, the bomb trajectory is accurate and does not deviate, and it can accurately hit the glass and quickly extinguish the fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a front view of a bomb throwing device of a fire-fighting drone of the present invention;

[0023] Figure 2 yes Figure 1 A magnified view of part B in FIG.

[0024] Figure 3 yes Figure 1 AA section view in;

[0025] Figure 4 yes Figure 3 The enlarged view of the C part in FIG.

[0026] Figure 5 yes Figure 3 The enlarged view of the D part in FIG.

[0027] Figure 6 yes Figure 3 An enlarged view of part E;

[0028] Figure 7 The present invention is a schematic diagram of a bomb throwing device of a fire-fighting drone during loading.

[0029] The following are the descriptions of the reference numerals:

[0030] 1. Launch tube; 2. Fire extinguisher bomb; 3. Electromagnet 1; 4. Threading hole 1; 5. Cover plate 1; 6. Connecting rod; 7. Ejection tube; 8. Mounting ring; 9. Spring; 10. Slide; 11. Electromagnet 2; 12. Slide; 13. Sliding block; 14. Threading hole 2; 15. Buffer pad; 16. Electromagnet 3; 17. Cover plate 2; 18. High-pressure gas tank; 19. Control valve; 20. Jet pipe; 21. Threading hole 3; 22. Lifting rope 1; 23. Lifting rope 2; 24. Electric hoist; 25. Pressure sensor; 26. Laser rangefinder. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] The present invention proposes a bomb-throwing device for a fire-fighting drone. The bomb-throwing device of the fire-fighting drone adopts electromagnetic drive to launch a fire-extinguishing bomb 2. While launching the fire-extinguishing bomb 2, the bomb-throwing device sprays air in the opposite direction of the launching, and utilizes the gas recoil principle to balance the recoil force received by the bomb-throwing device when launching the fire-extinguishing bomb 2, thereby achieving the technical effect of the bomb-throwing device stably launching the fire-extinguishing bomb 2. When launching the fire-extinguishing bomb 2, the drone does not shake, the bomb trajectory is accurate and does not deviate, and the bomb can accurately hit the glass and quickly extinguish the fire.

[0036] Specifically, in one embodiment of the invention, Figure 1 and Figure 3 As shown, the projectile throwing device of the fire-fighting drone includes a launching tube 1 and an ejection tube 7 which are coaxially fixedly connected. Both axial ends of the launching tube 1 and the ejection tube 7 are open. This design makes it convenient to install various components in the launching tube 1 and the ejection tube 7.

[0037] In this embodiment, if Figure 3 and Figure 4 As shown, the launch tube 1 is provided with an electromagnet 3, as shown in FIG. Figure 3 and Figure 5 As shown, the ejection tube 7 is provided with an electromagnet 2 11 and an electromagnet 3 16, and the electromagnet 1 3 and the electromagnet 2 11 are fixedly connected by a connecting rod 6. The electromagnet 3 16 is energized to attract the electromagnet 2 11 to approach, and drives the electromagnet 1 3 to slide axially in the launch tube 1 to approach the ejection tube 7. In this design, when the electromagnet 2 11 and the electromagnet 3 16 are energized and attracted together, the fire extinguishing bomb 2 is loaded into the launch tube 1 and contacts the electromagnet 1 3, and then the direction of the current is changed to make the electromagnet 2 11 and the electromagnet 3 16 repel each other at the same level. The electromagnet 3 16 is fixedly installed in the ejection tube 7. Under the action of the strong electromagnetic force of repulsion at the same level, the electromagnet 2 11 moves axially at high speed in the ejection tube 7 away from the electromagnet 3 16, thereby driving the fire extinguishing bomb 2 to move axially at high speed in the launch tube 1 away from the ejection tube 7, and finally the fire extinguishing bomb 2 is ejected from the launch tube 1.

[0038] In this embodiment, if Figure 1 and Figure 3 As shown, a high-pressure gas tank 18 is provided at one end of the ejection tube 7 away from the launch tube 1, and a control valve 19 is provided on the high-pressure gas tank 18. The control valve 19 is connected to an air jet pipe 20. The control valve 19 is used to eject air from the air jet pipe 20 and adjust the jet flow rate. The jet direction of the jet pipe 20 coincides with the sliding direction of the electromagnet 13 in the launch tube 1 when the electromagnet 3 16 is energized to attract the electromagnet 2 11 to approach, that is, the jet pipe 20 and the ejection tube 7 are coaxial. Figure 1 and Figure 3 As shown, the jetting direction of the jet pipe 20 is horizontal to the right, the fire extinguishing bomb 2 is ejected horizontally from the left end of the launch tube 1, and the jet pipe 20, the launch tube 1, and the ejection tube 7 are coaxially arranged; Figure 1As shown, the ejection tube 7 is suspended at the lower end of the suspension rope 1 22, the launching tube 1 is suspended at the lower end of the suspension rope 23, the upper end of the suspension rope 23 is connected to an electric hoist 24, the suspension rope 1 22 and the electric hoist 24 are installed on the UAV, and the bomb throwing device of the fire-fighting UAV of this embodiment is suspended directly below the UAV through the suspension rope. After the UAV is hovering in the air, the electromagnet 2 11 and the electromagnet 3 16 are controlled to launch the fire extinguishing bomb 2 while controlling the jet tube 20 to spray, and the gas recoil force of the jet tube 20 is used to balance the recoil force of the ejection tube 7 when the fire extinguishing bomb 2 is launched, as shown in FIG. Figure 1 As shown, the recoil force received by the ejection tube 7 is horizontally to the right, and when the jet tube 20 ejects jets, the recoil force received by the ejection tube 7 is horizontally to the left. The two forces are equal in magnitude and opposite in direction, thereby enabling the projectile device to stably launch the fire extinguishing bomb 2. When launching the fire extinguishing bomb 2, the launching tube 1 and the ejection tube 7 do not shake, and the drone does not shake either, thereby ensuring that the projectile trajectory is accurate and does not deviate, and can accurately hit the glass, enter the room, explode, and quickly extinguish the fire.

[0039] Further, such as Figure 1 , Figure 3 , Figure 4 As shown, the left end of the launch tube 1 is open, and the right end of the launch tube 1 is sealed by a cover plate 5. The interiors of the launch tube 1 and the ejection tube 7 are separated and not communicated with each other by the cover plate 5. The cover plate 5 and the launch tube 1 are both made of metal materials. This design is conducive to shielding the magnetic field of the launch tube 1, preventing the magnetic field from entering the launch tube 1 and affecting the launch of the fire extinguishing bomb 2. Figure 3 As shown, the shell of the fire extinguishing bomb 2 is usually made of metal material. The fire extinguishing bomb 2 moves horizontally to the left and is ejected from the launch tube 1, and the second electromagnet 11 and the third electromagnet 16 are located on the right side of the fire extinguishing bomb 2. When the fire extinguishing bomb 2 is launched, the second electromagnet 11 and the third electromagnet 16 generate a strong electromagnetic force that acts on the fire extinguishing bomb 2, that is, a rightward electromagnetic force is given to the fire extinguishing bomb 2. Obviously, this force will weaken the launch speed of the fire extinguishing bomb 2, so it is necessary to reduce the influence of this force on the fire extinguishing bomb 2 to a minimum. Therefore, in this embodiment, a cover plate 1 5 is provided at the right end of the launch tube 1 to cover the fire extinguishing bomb 2. Plate 1 5 and launching tube 1 are both made of metal materials, thereby forming magnetic shielding protection in launching tube 1, so that the strong electromagnetic field generated by electromagnet 2 11 and electromagnet 3 16 can only enter launching tube 1 from the left end opening of launching tube 1 to act on fire extinguishing bomb 2. After the electromagnetic field entering launching tube 1 from the left end opening of launching tube 1 acts on fire extinguishing bomb 2, it gives fire extinguishing bomb 2 a leftward pulling force, which is the same as the launching direction of fire extinguishing bomb 2, and helps to speed up the launching speed of fire extinguishing bomb 2, so this force is beneficial to the launching of fire extinguishing bomb 2.

[0040] Preferably, Figure 3As shown, the connecting rod 6 is coaxial with the launching tube 1 and the ejection tube 7, and the connecting rod 6 axially seals and slides through the cover plate 5. The connecting rod 6 is made of metal material. With this design, even if the connecting rod 6 axially seals and slides through the cover plate 5, the magnetic field can be well shielded from entering the launching tube 1 from the connection between the cover plate 5 and the connecting rod 6.

[0041] In this embodiment, if Figure 4 As shown, a threading hole 4 is provided on the wall of the launch tube 1 at one end close to the ejection tube 7. The threading hole 4 is used to connect the wire of the electromagnet 3 extending out of the launch tube 1. In order to reduce the magnetic flux entering the launch tube 1 through the threading hole 4, the smaller the aperture of the threading hole 4, the better. At the same time, the connection between the wire and the threading hole 4 should be sealed.

[0042] In this embodiment, the electromagnet 3 does not contact the inner wall of the launch tube 1. This design avoids the friction between the electromagnet 3 and the inner wall of the launch tube 1 affecting the launch speed of the fire extinguishing bomb 2. The purpose of setting the electromagnet 3 in this embodiment is to generate a small suction force through the electromagnet 3 to suck the fire extinguishing bomb 2, to prevent the fire extinguishing bomb 2 from sliding out of the open left end of the launch tube 1 when the launch tube 1 is tilted, and to prevent the connecting rod 6 from violently hitting the fire extinguishing bomb 2 to cause damage to the fire extinguishing bomb 2 and explosion. Figure 3 As shown, if the fire extinguishing bomb 2 does not keep contact with the left end of the connecting rod 6, then after the electromagnet 2 11 and the electromagnet 3 16 repel each other at the same level, the connecting rod 6 quickly moves to the left and hits the fire extinguishing bomb 2, which may easily cause the fire extinguishing bomb 2 to be damaged and exploded. After the electromagnet 1 3 is set, the fire extinguishing bomb 2 is firmly sucked by the electromagnet 1 3, which can avoid the separation of the fire extinguishing bomb 2 and the left end of the connecting rod 6 due to the shaking of the launching tube 1 and the ejection tube 7, thereby ensuring the safety of launching. Because the fire extinguishing bomb 2 can always be in contact with the electromagnet 1 3, after the electromagnet 2 11 and the electromagnet 3 16 repel each other at the same level, the connecting rod 6 and the electromagnet 1 3 quickly move to the left and will not hit the fire extinguishing bomb 2, and the fire extinguishing bomb 2 is safely pushed out from the left end of the launching tube 1, thereby ensuring the safety of launching. Of course, the suction force of the electromagnet 3 to attract the fire extinguishing bomb 2 should not be too large, otherwise it will have a greater impact on the launching speed of the fire extinguishing bomb 2.

[0043] In this embodiment, the fire extinguishing bomb 2 is loaded as follows: Figure 7 As shown, when it is necessary to load the fire extinguishing bomb 2 into the launch tube 1, the electric hoist 24 is controlled to make the left end of the launch tube 1 tilt upward, and then the mechanical arm set on the drone is used to grab the fire extinguishing bomb 2 stored on the drone and put it into the launch tube 1. After the fire extinguishing bomb 2 enters the launch tube 1 from the left end of the launch tube 1, it slides to the right end of the launch tube 1 by itself and is sucked by the electromagnet 3, completing the loading work.

[0044] In this embodiment, if Figure 3 and Figure 6As shown, the electromagnet three 16 is fixedly installed in the ejection tube 7 at one end away from the launching tube 1, and a threading hole three 21 is provided on the ejection tube 7 at the end away from the launching tube 1. The threading hole three 21 is for the wire connected to the electromagnet three 16 to extend out of the ejection tube 7. Furthermore, a cover plate two 17 is detachably fixedly installed on the end of the ejection tube 7 away from the launching tube 1, and the high-pressure gas tank 18 is fixedly connected to the cover plate two 17. This design makes it convenient to install the electromagnet three 16 in the ejection tube 7.

[0045] In this embodiment, if Figure 3 and Figure 5 As shown, the electromagnet 11 is tightly sleeved with a slide cylinder 12, and the slide cylinder 12 slides axially against the inner wall of the ejection tube 7. This design is conducive to the smooth axial sliding of the electromagnet 11. Figure 1-Figure 5 As shown, a straight-shaped slide groove 10 extending along the axial direction of the ejection tube 7 is provided on the tube wall of the ejection tube 7, and a slider 13 is slidably installed in the slide groove 10, one end of the slider 13 is fixedly connected to the slide tube 12, and the other end of the slider 13 passes through the slide groove 10 and extends out of the ejection tube 7; a mounting ring 8 is coaxially fixedly installed on the outer wall of the ejection tube 7 close to the end of the launch tube 1, and a pressure sensor 25 is installed on the mounting ring 8, and a spring 9 is coaxially sleeved outside the ejection tube 7, one end of the spring 9 is connected to the pressure sensor 25, and the slider 13 will contact with the other end of the spring 9 and squeeze the spring 9 when it slides along the slide groove 10 close to the launch tube 1. Once the slider 13 squeezes the spring 9, the pressure sensor 25 detects a pressure signal, which is transmitted to the controller on the drone, and the controller controls the electromagnet according to the pressure signal. 3. Electromagnet 2 11 and electromagnet 3 16 are powered off, that is, before the slider 13 touches the spring 9, electromagnet 1 3, electromagnet 2 11 and electromagnet 3 16 remain powered on, and the fire extinguishing bomb 2 is still attracted by electromagnet 1 3. Electromagnet 2 11 and electromagnet 3 16 repel each other at the same level, generating a strong electromagnetic force to push electromagnet 2 11, electromagnet 1 3 and the fire extinguishing bomb 2 to move to the left at an accelerated speed. After the slider 13 touches the spring 9 and the pressure sensor 25 detects the pressure signal, electromagnet 1 3, electromagnet 2 11 and electromagnet 3 16 are powered off, and electromagnet 2 11 and electromagnet 1 3 begin to decelerate under the action of the spring 9, and the fire extinguishing bomb 2 separates from electromagnet 1 3 and is then ejected from the launching tube 1. The setting of the slider 13 is conducive to using the spring 9 to accelerate the deceleration of electromagnet 2 11 and electromagnet 1 3, so that the length of the ejection tube 7 can be designed to be shorter, which is conducive to the stable flight of the UAV.

[0046] In this embodiment, if Figure 5 As shown, the slider 13 is provided with a second threading hole 14, and the second threading hole 14 extends from one end of the slider 13 to the other end of the slider 13. This design facilitates the wire connected to the electromagnet 11 to pass through the second threading hole 14 and extend out of the ejection tube 7.

[0047] In this embodiment, if Figure 5 As shown, a buffer pad 15 is provided on the side of the electromagnet 2 11 that contacts the electromagnet 3 16 . With this design, when the electromagnet 3 16 is energized to attract the electromagnet 2 11 to approach, the buffer pad 15 can avoid a rigid collision between the electromagnet 3 16 and the electromagnet 2 11 .

[0048] In this embodiment, since the magnitude of the recoil force received by the ejection tube 7 changes all the time during the launch of the fire extinguishing bomb 2, it is required that the magnitude of the recoil force received by the ejection tube 7 also changes accordingly, that is, the jet flow rate of the jet tube 20 changes in real time. In order to accurately obtain the instantaneous value of the jet flow rate of the jet tube 20, it is necessary to conduct experiments on various types of fire extinguishing bombs 2 before using the bomb throwing device of the fire-fighting drone of this embodiment. Through the experiment, the specific and accurate instantaneous value of the jet flow rate of the jet tube 20 is obtained during the launch of the fire extinguishing bomb 2 to ensure that the ejection tube 7 and the drone do not shake. The obtained specific and accurate instantaneous value is transmitted to the drone and retrieved by the controller, so that in the subsequent actual launch of the fire extinguishing bomb 2, the controller can accurately control the jet flow rate of the jet tube 20 to achieve the purpose of preventing the ejection tube 7 and the drone from shaking during the launch of the fire extinguishing bomb 2.

[0049] In this embodiment, in order to ensure the accuracy of experimental data, Figure 1 As shown, the outer wall of the ejection tube 7 and the launch tube 1 is provided with a laser rangefinder 26. When the ejection tube 7 and the launch tube 1 are suspended by the lowering of the suspension rope 1 22 and the suspension rope 2 23 and kept horizontal, as shown in FIG. Figure 1 As shown, the laser rangefinder 26 emits laser vertically upward to measure the distance between the launch tube 1, the ejection tube 7 and the UAV directly above it. When the recoil and the recoil force received by the ejection tube 7 are of different magnitudes, the launch tube 1 and the ejection tube 7 will swing left and right, and accordingly, the measurement value of the laser rangefinder 26 changes. Conversely, the measurement value of the laser rangefinder 26 does not change, indicating that the launch tube 1 and the ejection tube 7 do not shake during the launching process, and the recoil and the recoil force received by the ejection tube 7 are equal. This design is conducive to obtaining accurate instantaneous experimental data of the jet flow rate of the jet tube 20.

[0050] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A bomb throwing device for a fire-fighting drone, characterized in that: It comprises a launching tube and an ejection tube which are coaxially fixedly connected. The launching tube is provided with an electromagnet 1, and the ejection tube is provided with an electromagnet 2 and an electromagnet 3. The electromagnet 1 and the electromagnet 2 are fixedly connected via a connecting rod. The electromagnet 3 is energized to attract the electromagnet 2 to approach, and drives the electromagnet 1 to slide axially in the launching tube and approach the ejection tube. A high-pressure gas tank is arranged at one end of the ejection tube away from the launch tube, and a control valve is arranged on the high-pressure gas tank, and an air jet pipe is connected to the control valve, and the air jet direction of the air jet pipe coincides with the sliding direction of the electromagnet 1 in the launch tube when the electromagnet 3 is energized to attract the electromagnet 2 to approach; The ejection tube is suspended at the lower end of the first lifting rope, the launching tube is suspended at the lower end of the second lifting rope, and the upper end of the second lifting rope is connected to an electric hoist; The electromagnet three is fixedly mounted in the ejection tube at one end away from the launching tube, and a threading hole three is provided on the ejection tube at one end away from the launching tube; A slide cylinder is tightly sleeved outside the second electromagnet, and the slide cylinder slides axially against the inner wall of the ejection cylinder. A straight slide groove extending along the axial direction of the ejection cylinder is provided on the cylinder wall of the ejection cylinder, and a slider is slidably installed in the slide groove, one end of the slider is fixedly connected to the slide cylinder, and the other end of the slider passes through the slide groove and extends out of the ejection cylinder; A mounting ring is coaxially fixedly mounted on the outer wall of the ejection tube close to one end of the launching tube, and a pressure sensor is mounted on the mounting ring. A spring is coaxially sleeved outside the ejection tube, and one end of the spring is connected to the pressure sensor. When the slider slides along the slide groove and approaches the launching tube, it contacts the other end of the spring and squeezes the spring.

2. The projectile throwing device of a fire-fighting drone as claimed in claim 1, characterized in that: A cover plate 1 is provided at the connection between the launch tube and the ejection tube, and the interiors of the launch tube and the ejection tube are separated from each other by the cover plate 1; The connecting rod is coaxial with the launching tube and the ejection tube, and the connecting rod axially slides through the cover plate 1; The material of the launching tube and the cover plate is metal.

3. The projectile throwing device of a fire-fighting drone as claimed in claim 1, characterized in that: A threading hole 1 is arranged on the wall of the launching tube at one end close to the ejection tube.

4. The projectile throwing device of a fire-fighting drone as claimed in claim 1, characterized in that: The slider is provided with a second threading hole, and the second threading hole extends from one end of the slider to the other end of the slider.

5. The projectile throwing device of a fire-fighting drone as claimed in claim 1, characterized in that: A buffer pad is arranged on the side of the electromagnet 2 that contacts the electromagnet 3.

6. The projectile throwing device of a fire-fighting drone as claimed in claim 1, characterized in that: A cover plate 2 is detachably fixedly mounted on one end of the ejection tube away from the launching tube, and the high-pressure gas tank is fixedly connected to the cover plate 2.

7. The projectile throwing device of a fire-fighting drone as claimed in claim 1, characterized in that: The electromagnet does not contact the inner wall of the launching tube.

8. The projectile throwing device of a fire-fighting drone as claimed in claim 1, characterized in that: Laser rangefinders are arranged on the outer walls of the ejection tube and the launching tube. When the ejection tube and the launching tube are suspended below the first and second hanging ropes and kept horizontal, the laser rangefinders emit lasers vertically upwards.

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