Metal hose water cannon and control method thereof

Abstract

The present application relates to a kind of water cannon and its control method, specifically to a kind of metal hose water cannon and its control method, solve the technical problem that existing water cannon is difficult to simultaneously realize fluid flow state good and water cannon compactness, and there are more elbow pipe, bending angle is larger, energy loss is caused easily, not conducive to the performance of water cannon is improved.The metal hose water cannon further includes first electric push rod, first mechanical control unit, second mechanical control unit, third mechanical control unit, horizontal rotary seat and metal hose;Third mechanical control unit is used to make horizontal rotary seat, metal hose and cannon head rotate around cannon base to realize water cannon horizontal rotation angle adjustment;First mechanical control unit is used to adjust the center arc line position and form of metal hose with first electric push rod collaborative movement;Second mechanical control unit is used to adjust the rotation angle of cannon head with first electric push rod collaborative movement.The present application method can efficiently and stably control water cannon position and angle.

Description

Technical Field

[0001] This invention relates to a water cannon and its control method, specifically to a metal hose water cannon and its control method. Background Technology

[0002] Existing water cannons, especially high-flow-rate, long-range water cannons, have relatively complex rotating structures due to functional requirements. A suitable rotating structure can significantly increase the range and improve the performance of the water cannon. Common rotating structures for high-flow-rate water cannons include U-shaped rotation, semi-rotation, and large rotation structures.

[0003] To ensure the successful rotation of the water cannon, the first consideration for its rotating structure must be the alteration of the internal fluid flow. Secondly, the overall structure must be compact, and the transmission mechanism should be rationally arranged. Excellent internal fluid flow means that the fluid's flow direction should transition smoothly as it passes through the rotating structure, avoiding excessive or rapid changes in flow direction. The main influencing factors are the number of bends, the bending angles, and the radius of curvature R at the bends in the rotating structure. Fewer bends, fewer bending angles, and a larger radius of curvature R at the bends result in better internal fluid flow. The compactness of the structure is also related to the three factors mentioned above. The more bends and the larger the bending angle, the larger the size of the water cannon. Let d be the pipe diameter of the bend. When the pipe diameter d is fixed, the larger the R / d value, the larger the length and width of the water cannon. For vehicle-mounted fixed water cannons or high-flow water cannons used on ships, it will occupy more space. The smaller the R / d value, the more space can be saved, but the performance of the water cannon will be affected. The choice of pipe diameter d is directly related to the design flow rate. Under the condition that the pipe diameter d is fixed, the selection of the radius of curvature R value not only affects the flow loss and fluid circulation performance of the water cannon, but also directly affects the compactness of the overall structure of the water cannon.

[0004] Research on existing water cannon rotation structures reveals that, regardless of the three structures mentioned above, achieving both good fluid flow and compact structure is difficult. The numerous bends and large bending angles result in significant energy losses, hindering performance improvement. Large-rotation structures, with their large R / d ratio and radius of curvature, improve fluid flow, minimizing turbulence at the cannon outlet and increasing range and jet concentration. However, this structure results in a bulky cannon and the greatest energy loss due to pressure loss along the flow path, further impeding performance improvement. While U-shaped and semi-rotation structures are more compact, their smaller R / d ratio and radius of curvature (R) lead to more frequent and rapid changes in flow direction, resulting in higher turbulence and hindering range and jet concentration.

[0005] In summary, the existing water cannon structure has a large number of bends, large bending angles, and small radii of curvature at the bends, which causes fluid flow turbulence and energy loss, thus affecting the water cannon's range and the concentration of the water cannon jet. Summary of the Invention

[0006] The purpose of this invention is to solve the technical problems of existing water cannons, which are difficult to achieve both good fluid flow and compact structure at the same time, and have a large number of bends and large bending angles, which easily cause energy loss and are not conducive to improving the performance of the water cannon. The invention provides a metal hose water cannon and its control method.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A metal hose water cannon includes a cannon base and a cannon head; its special feature is that it also includes a first electric push rod, a first mechanical control unit, a second mechanical control unit, a third mechanical control unit, a horizontal rotary seat, and a metal hose fixedly connected between the horizontal rotary seat and the cannon head;

[0009] The horizontal slewing seat is sleeved on the upper outer side of the gun base, and a gear is set on the outer side wall of the upper end of the gun base corresponding to the position of the horizontal slewing seat; the third mechanical control unit is set on the outer side wall of the horizontal slewing seat, and its output end meshes with the gear to make the horizontal slewing seat, the metal hose and the gun head rotate around the gun base to realize the adjustment of the horizontal slewing angle of the water gun.

[0010] A first fixed shaft is provided at the connection between the metal hose and the horizontal rotary seat, and a second fixed shaft is provided at the connection between the metal hose and the gun head, with the second fixed shaft and the first fixed shaft located on the same side;

[0011] The first electric actuator is a telescopic actuator, with its fixed end rotatably sleeved on a first fixed shaft and its telescopic end rotatably sleeved on a second fixed shaft; a first worm gear is rotatably sleeved on one end of the first fixed shaft, the first worm gear being located outside the fixed end of the first electric actuator and fixedly connected to the fixed end of the first electric actuator; a second worm gear is fixedly connected to one end of the second fixed shaft, the second worm gear being located outside the telescopic end of the first electric actuator;

[0012] The first mechanical control unit is located on the outer side wall of the top of the horizontal rotary seat. Its output end meshes with the first worm gear and is used to coordinate with the first electric push rod to adjust the position and shape of the center arc of the metal hose.

[0013] The second mechanical control unit is located on the outer wall of the telescopic end of the first electric push rod, and its output end meshes with the second worm gear. It is used to coordinate with the first electric push rod to adjust the rotation angle of the gun head.

[0014] Furthermore, it also includes a second electric actuator;

[0015] A third fixed shaft, coaxial with the first fixed shaft, is fixedly connected to the connection between the metal hose and the horizontal rotary seat; a fourth fixed shaft, coaxial with the second fixed shaft, is fixedly connected to the connection between the metal hose and the gun head.

[0016] The fixed end of the second electric push rod is rotatably sleeved on the third fixed shaft, and the telescopic end is rotatably sleeved on the fourth fixed shaft. The second electric push rod moves simultaneously with the first electric push rod to stabilize the metal hose and the gun head.

[0017] Furthermore, the first mechanical control unit includes a motor and a worm gear;

[0018] The motor is mounted on the outer side wall of the top of the horizontal rotary seat, and its output shaft meshes with the first worm wheel through a worm gear;

[0019] The structures of the second and third mechanical control units are the same as those of the first mechanical control unit. The motor of the second mechanical control unit is located on the outer wall of the other end of the first electric push rod, and its output shaft meshes with the second worm gear through a worm. The motor of the third mechanical control unit is located on the outer wall of the horizontal rotary seat, and its output end meshes with the gear through a worm.

[0020] Furthermore, the central arc at the connection between the metal hose and the horizontal rotary seat is perpendicular to the top of the horizontal rotary seat.

[0021] Furthermore, the central arc at the connection point between the metal hose and the gun head is tangent to the central axis of the gun head.

[0022] Furthermore, the radius of curvature of the metal flexible hose is 360mm-2250mm.

[0023] Furthermore, the water cannon has a total of 1 bend, a maximum total bend angle of 125 degrees, and a minimum total bend angle of 20 degrees.

[0024] Furthermore, the maximum rotation angle of the cannon head is 70 degrees, and the minimum is -35 degrees.

[0025] Meanwhile, the present invention also provides a control method for the above-mentioned metal hose water cannon, which is characterized by including the following steps:

[0026] 1) Control the third mechanical control unit to adjust the horizontal rotation angle of the horizontal slewing seat;

[0027] 2】Control the first mechanical control unit to drive the first electric push rod to rotate along the first fixed axis and automatically extend and retract, adjusting the center arc position and shape of the metal hose; at the same time, control the second mechanical control unit to control the first electric push rod to rotate along the second fixed axis and automatically extend and retract, adjusting the rotation angle of the gun head;

[0028] Step 1 and Step 2 are not in any particular order.

[0029] Further, in step 2], the position and shape of the center arc of the metal hose are adjusted, specifically as follows:

[0030] Adjust the center arc of the connection between the metal hose and the horizontal rotary seat to be perpendicular to the top of the horizontal rotary seat, and the center arc of the connection between the metal hose and the gun head to be tangent to the central axis of the gun head, with a radius of curvature of 360mm-2250mm.

[0031] The beneficial effects of this invention are:

[0032] 1. This invention relates to a metal hose water cannon. By adopting a novel rotating structure consisting of a metal hose, a cannon head, and a first mechanical control unit, a second mechanical control unit, and a third mechanical control unit, the bending angle of the water cannon's rotating structure is reduced by more than 65%, the number of bends is reduced by more than 75%, and the radius of curvature is increased by 2 to 7 times. This greatly improves the performance of the water cannon and solves the problems of water flow turbulence and energy loss. This rotating structure can increase the water cannon's range by more than 5m, and the jet focusing ability, measured by the exit turbulent kinetic energy, can be reduced by more than 5%.

[0033] 2. The present invention provides a metal hose water cannon, which reduces the volume of the rotating structure, making the water cannon structure more compact and saving installation space.

[0034] 3. The present invention provides a metal flexible hose water cannon, which utilizes a first mechanical control unit, a second mechanical control unit, and a third mechanical control unit to efficiently and stably control the position and angle of the water cannon, and is self-locking. It can also be applied to the position and angle control of other flexible hoses. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of an embodiment of a metal hose water cannon according to the present invention;

[0036] Figure 2 This is a schematic diagram of the installation of the metal hose, the first fixed shaft, the first mechanical control unit, the first worm gear, the first electric push rod and the second fixed shaft in an embodiment of the metal hose water cannon of the present invention;

[0037] Figure 3 This is a schematic diagram of the installation of the metal hose, the cannon head, the second fixed shaft, the second mechanical control unit, the second worm gear, and the first electric push rod in an embodiment of the metal hose water cannon of the present invention;

[0038] Figure 4 This is a schematic diagram of the installation of the cannon base, the horizontal rotating seat and the third mechanical control unit in an embodiment of a metal hose water cannon of the present invention;

[0039] Figure 5 This is a schematic diagram of a water cannon with a maximum elevation angle of 70 degrees in an embodiment of a metal hose water cannon of the present invention;

[0040] Figure 6 This is a schematic diagram of an embodiment of a metal hose water cannon of the present invention, in which the water cannon commonly uses an elevation angle of 30 degrees;

[0041] Figure 7 This is a schematic diagram of an embodiment of a metal hose water cannon of the present invention, showing a maximum depression angle of -35 degrees.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Gun base; 101. Gear; 2. Third mechanical control unit; 3. Metal hose; 4. Second electric push rod; 5. First electric push rod; 501-First worm gear; 502-Second worm gear; 6. First fixed shaft; 7. First mechanical control unit; 8. Second mechanical control unit; 9. Second fixed shaft; 10. Gun head; 11. Horizontal swivel base. Detailed Implementation

[0044] like Figure 1 , Figure 2 , Figure 3 As shown, a metal hose water cannon includes a cannon base 1, a cannon head 10, a first electric push rod 5, a first mechanical control unit 7, a second mechanical control unit 8, a third mechanical control unit 2, a second electric push rod 4, a horizontal swivel base 11, and a metal hose 3 fixedly connected between the horizontal swivel base 11 and the cannon head 10.

[0045] A horizontal rotating seat 11 is sleeved on the upper outer side of the gun base 1. A gear 101 is provided on the outer side wall of the upper end of the gun base 1 at the position corresponding to the horizontal rotating seat 11. The third mechanical control unit 2 is provided on the outer side wall of the horizontal rotating seat 11, and its output end meshes with the gear 101 to make the horizontal rotating seat 11, the metal hose 3 and the gun head 10 rotate around the gun base 1 to realize the adjustment of the horizontal rotation angle of the water cannon. A first fixed shaft 6 is provided at the connection between the metal hose 3 and the horizontal rotating seat 11, and a second fixed shaft 9 is provided at the connection between the metal hose 3 and the gun head 10. The second fixed shaft 9 and the first fixed shaft 6 are located on the same side.

[0046] The first electric push rod 5 is a telescopic push rod, with its fixed end rotatably sleeved on the first fixed shaft 6 and its telescopic end rotatably sleeved on the second fixed shaft 9; a first worm gear 501 is rotatably sleeved on one end of the first fixed shaft 6, the first worm gear 501 is located outside the fixed end of the first electric push rod 5 and is fixedly connected to the fixed end of the first electric push rod 5; a second worm gear 502 is fixedly connected to one end of the second fixed shaft 9, the second worm gear 502 is located outside the telescopic end of the first electric push rod 5.

[0047] The first mechanical control unit 7 is located on the outer wall of the top of the horizontal rotary seat 11. Its output end meshes with the first worm gear 501 and is used to coordinate with the first electric push rod 5 to adjust the position and shape of the center arc of the metal hose 3. The second mechanical control unit 8 is located on the outer wall of the telescopic end of the first electric push rod 5. Its output end meshes with the second worm gear 502 and is used to coordinate with the first electric push rod 5 to adjust the rotation angle of the gun head 10. The second mechanical control unit 8 is located on the outer wall of the other end of the first electric push rod 5 and does not affect the telescopic movement of the first electric push rod 5.

[0048] like Figure 4 As shown, a horizontal rotating seat 11 is sleeved on the upper outer side of the gun base 1. A gear 101 is installed on the outer side wall of the upper end of the gun base 1 at a position corresponding to the horizontal rotating seat 11. A third mechanical control unit 2 is installed on the outer side wall of the horizontal rotating seat 11, and its output end meshes with the gear 101 to rotate the horizontal rotating seat 11 around the gun base 1 to adjust the horizontal rotation angle of the water cannon. The third mechanical control unit 2 rotates around the gear 101, thereby driving the horizontal rotating seat 11, the metal hose 3, and the gun head 10 to rotate along the central axis of the gun base 1, thus completing the horizontal rotation angle control of the water cannon.

[0049] The metal hose 3 is fixedly connected to the horizontal rotary seat 11 with a third fixed shaft coaxial with the first fixed shaft 6; the metal hose 3 is fixedly connected to the gun head 10 with a fourth fixed shaft coaxial with the second fixed shaft 9; the third fixed shaft and the fourth fixed shaft are located on the same side; the fixed end of the second electric push rod 4 is rotatably sleeved on the third fixed shaft, and the telescopic end is rotatably sleeved on the fourth fixed shaft. The second electric push rod 4 and the first electric push rod 5 move simultaneously to stabilize the metal hose 3 and the gun head 10.

[0050] In this embodiment, the first mechanical control unit 7 includes a motor and a worm gear. The motor is mounted on the outer wall of the top of the horizontal rotary seat 11, and its output shaft meshes with the first worm wheel 501 via the worm gear. The structures of the second mechanical control unit 8 and the third mechanical control unit 2 are the same as those of the first mechanical control unit 7. The motor of the second mechanical control unit 8 is mounted on the outer wall of the other end of the first electric push rod 5, and its output shaft meshes with the second worm wheel 502 via the worm gear. The motor of the third mechanical control unit 2 is mounted on the outer wall of the horizontal rotary seat 11, and its output end meshes with the gear 101 via the worm gear. The first mechanical control unit 7, the second mechanical control unit 8, and the third mechanical control unit 2 are all self-locking, enabling position locking and maintaining the stability of the entire structure.

[0051] The first mechanical control unit 7, the second mechanical control unit 8, the third mechanical control unit 2, the first electric push rod 5, and the second electric push rod 4, when completing the water cannon's rotation action, can control the metal hose 3 to achieve the optimal degree of bending. The purpose is to select the optimal radius of curvature. Because the metal hose 3 has a certain rigidity, and this rigidity increases with increasing water pressure, the curvature of the metal hose 3 can be controlled by adjusting its starting and ending positions. The central arc of the metal hose 3 is defined as a standard circular arc, making the central arc at the connection point between the metal hose 3 and the horizontal rotating seat 11 perpendicular to the top of the horizontal rotating seat 11. The central axis of the cannon head 10 is tangent to the ending point of the central arc of the metal hose 3, achieving the smoothest flow of fluid with minimal energy loss. Since one end of the metal hose 3 is fixedly connected to the horizontal rotating seat 11, this point is fixed and set as the starting point of the arc of the metal hose 3. The other end of the metal hose 3 is fixedly connected to the cannon head 10 and set as the ending point of the arc. Since the length of the metal hose 3 is a fixed value, the length of the arc is determined.

[0052] When the desired water cannon elevation angle is to be achieved, the central angle θ corresponding to the arc of the metal hose 3 can be calculated using the following arc length formula:

[0053]

[0054] Where l is the arc length of the metal hose 3; r is the radius of curvature of the metal hose 3;

[0055] Since the central axis of the cannon head 10 is tangent to the end point of the central arc of the metal hose 3, the relationship between the water cannon elevation angle α and the central angle θ corresponding to the arc satisfies α = 90 - θ. According to the above formula, to achieve the set water cannon elevation angle α, it can be achieved by adjusting the central angle θ corresponding to the arc, and the central angle θ corresponding to the arc can be achieved by adjusting the end point position of the metal hose 3.

[0056] In this embodiment, the position control of the end point of the metal hose 3 includes both horizontal and vertical positions. A single linear motion cannot satisfy this requirement. Therefore, a first mechanical control unit 7 and a second mechanical control unit 8 are designed. The electric push rods (i.e., the first electric push rod 5 and the second electric push rod 4) are telescopic, thus achieving linear motion. The electric push rods are rotatably connected to the first fixed shaft 6 and the second fixed shaft 9, respectively, and can rotate around the first fixed shaft 6 or the second fixed shaft 9. The combination of the two motions can achieve the control of the horizontal and vertical directions of the end point of the metal hose 3.

[0057] When the water cannon's elevation angle α is known, the extension / retraction amount X of the electric actuator and the motor rotation angle A of the first mechanical control unit 7 can be calculated using the chord length formula. The rotation angle of the first electric actuator 5 is kA, where k represents the transmission coefficient, which is a fixed value. Then, the second mechanical control unit 8 is controlled to control the shape of the metal hose 3 and the position of the endpoint of the center arc of the metal hose 3, thus maintaining the optimal posture of the metal hose 3 to ensure the optimal flow state of the fluid inside the water cannon. At the same time, the first electric actuator 5, the second electric actuator 4, and the second mechanical control unit 8 serve to fix the cannon head 10. Because the metal hose 3 lacks sufficient support, the first electric actuator 5 and the second electric actuator 4 are needed to fix the cannon head 10 and prevent the position of the cannon head 10 from shifting.

[0058] When the end position of the metal hose 3 is determined, in order to achieve and maintain the set rotation angle of the cannon head 10, it is necessary to calculate the rotation angle of the cannon head 10 according to the set water cannon elevation angle value α, and then control the second mechanical control unit 8 to adjust the rotation angle of the cannon head 10, so as to finally achieve that the central axis of the cannon head 10 is tangent to the end point of the central arc at the connection between the metal hose 3 and the cannon head 10.

[0059] This invention provides a metal hose water cannon with a total bending count of 1, a maximum total bending angle of 125 degrees, and a minimum total bending angle of 20 degrees, significantly reducing the pipe bending angle and the number of bends. Taking a water cannon of the same specifications as an example, using this invention's metal hose water cannon, the radius of curvature of the metal hose 3 is 360mm at the maximum bending angle and 250mm at the minimum bending angle. The rotation angle (maximum elevation angle) of the cannon head 10 is a maximum of 70 degrees and a minimum (minimum depression angle) of -35 degrees. Figure 5 This is a schematic diagram showing the water cannon operating at a maximum elevation angle of 70 degrees. Figure 6 This is a schematic diagram showing the maximum elevation angle of a water cannon during operation, with the commonly used elevation angle being 30 degrees. Figure 7 This is a schematic diagram showing a maximum depression angle of -35 degrees.

[0060] The central axis of the cannon head 10 is tangent to the end point of the central arc at the connection between the metal hose 3 and the cannon head 10. The starting point of the metal hose 3 is perpendicularly connected to the top plane of the cannon base 1, which can maintain the optimal posture of the water cannon so that the flow state of the fluid inside the water cannon is optimal.

[0061] The existing water cannon rotary structure requires at least four bends, with a total bending angle exceeding 360 degrees. The maximum radius of curvature is approximately 330mm, and the minimum is approximately 180mm. Compared to the previous design, this design represents a significant optimization in terms of bending angle, number of bends, and radius of curvature. This improves upon issues such as water flow turbulence, energy loss, and the large size of the water cannon, enhancing its performance, including range, jet concentration, and compact structure. Furthermore, the self-locking property of the worm gear drive allows for 10-degree self-locking of the cannon head.

[0062] Meanwhile, the present invention also provides a control method based on the above-mentioned metal hose water cannon, including the following steps:

[0063] 1) Control the third mechanical control unit 2 to adjust the horizontal rotation angle of the horizontal rotary seat 11;

[0064] 2】Control the first mechanical control unit 7 to drive the first electric push rod 5 to rotate along the first fixed shaft 6 and automatically extend and retract, adjusting the center arc position and shape of the metal hose 3; at the same time, control the second mechanical control unit 8 to control the first electric push rod 5 to rotate along the second fixed shaft 9 and automatically extend and retract, adjusting the rotation angle of the gun head 10.

[0065] When the central arc of the connection between the metal hose 3 and the horizontal rotary seat 11 is perpendicular to the top of the horizontal rotary seat 11, and the central arc of the connection between the metal hose 3 and the gun head 10 is tangent to the central axis of the gun head 10, and its radius of curvature is 360mm-2250mm. Steps 1 and 2 are not in any particular order.

Claims

1. A metal hose water cannon, comprising a cannon base (1) and a cannon head (10); characterized in that: It also includes a first electric push rod (5), a first mechanical control unit (7), a second mechanical control unit (8), a third mechanical control unit (2), a horizontal rotary seat (11), and a metal hose (3) fixedly connected between the horizontal rotary seat (11) and the gun head (10); The horizontal rotary seat (11) is sleeved on the upper outer side of the gun base (1), and a gear (101) is provided on the outer side wall of the upper end of the gun base (1) at the position corresponding to the horizontal rotary seat (11); the third mechanical control unit (2) is provided on the outer side wall of the horizontal rotary seat (11), and its output end meshes with the gear (101) to make the horizontal rotary seat (11), the metal hose (3) and the gun head (10) rotate around the gun base (1) to realize the adjustment of the horizontal rotation angle of the water gun; A first fixed shaft (6) is provided at the connection between the metal hose (3) and the horizontal rotary seat (11), and a second fixed shaft (9) is provided at the connection between the metal hose (3) and the gun head (10), and the second fixed shaft (9) and the first fixed shaft (6) are located on the same side; The first electric push rod (5) is a telescopic push rod, with its fixed end rotatably sleeved on the first fixed shaft (6) and its telescopic end rotatably sleeved on the second fixed shaft (9); a first worm gear (501) is rotatably sleeved on one end of the first fixed shaft (6), the first worm gear (501) is located outside the fixed end of the first electric push rod (5) and is fixedly connected to the fixed end of the first electric push rod (5); a second worm gear (502) is fixedly connected to one end of the second fixed shaft (9), the second worm gear (502) is located outside the telescopic end of the first electric push rod (5); The first mechanical control unit (7) is located on the outer side wall of the top of the horizontal rotary seat (11), and its output end meshes with the first worm gear (501) to coordinate with the first electric push rod (5) to adjust the center arc position and shape of the metal hose (3); The second mechanical control unit (8) is located on the outer side wall of the telescopic end of the first electric push rod (5), and its output end meshes with the second worm gear (502) to coordinate with the first electric push rod (5) to adjust the rotation angle of the gun head (10).

2. The metal hose water cannon according to claim 1, characterized in that: It also includes a second electric actuator (4); The metal hose (3) is fixedly connected to the horizontal rotary seat (11) with a third fixed shaft coaxial with the first fixed shaft (6); the metal hose (3) is fixedly connected to the gun head (10) with a fourth fixed shaft coaxial with the second fixed shaft (9). The fixed end of the second electric push rod (4) is rotatably sleeved on the third fixed shaft, and the telescopic end is rotatably sleeved on the fourth fixed shaft. The second electric push rod (4) and the first electric push rod (5) move simultaneously to stabilize the metal hose (3) and the gun head (10).

3. A metal hose water cannon according to claim 2, characterized in that: The first mechanical control unit (7) includes a motor and a worm gear; The motor is mounted on the outer side wall of the top of the horizontal rotary seat (11), and its output shaft meshes with the first worm wheel (501) through a worm. The structure of the second mechanical control unit (8) and the structure of the third mechanical control unit (2) are the same as those of the first mechanical control unit (7); the motor of the second mechanical control unit (8) is located on the outer side wall of the other end of the first electric push rod (5), and its output shaft meshes with the second worm wheel (502) through a worm; the motor of the third mechanical control unit (2) is located on the outer side wall of the horizontal rotary seat (11), and its output end meshes with the gear (101) through a worm.

4. A metal hose water cannon according to claim 3, characterized in that: The central arc at the connection between the metal hose (3) and the horizontal rotary seat (11) is perpendicular to the top of the horizontal rotary seat (11).

5. A metal hose water cannon according to claim 3, characterized in that: The central arc of the connection between the metal hose (3) and the connecting gun head (10) is tangent to the central axis of the gun head (10).

6. A metal hose water cannon according to claim 4 or 5, characterized in that: The radius of curvature of the metal flexible hose (3) is 360mm-2250mm.

7. A metal hose water cannon according to claim 1, characterized in that: The water cannon has a total of 1 bend, a maximum total bend angle of 125 degrees, and a minimum total bend angle of 20 degrees.

8. A metal hose water cannon according to claim 7, characterized in that: The maximum rotation angle of the gun head (10) is 70 degrees and the minimum is -35 degrees.

9. A control method for a metal hose water cannon according to any one of claims 1 to 8, characterized in that, Includes the following steps: 1) Control the third mechanical control unit (2) to adjust the horizontal rotation angle of the horizontal rotary seat (11); 2】Control the first mechanical control unit (7) to drive the first electric push rod (5) to rotate along the first fixed axis (6) and automatically extend and retract, adjusting the center arc position and shape of the metal hose (3); at the same time, control the second mechanical control unit (8) to control the first electric push rod (5) to rotate along the second fixed axis (9) and automatically extend and retract, adjusting the rotation angle of the gun head (10); Step 1 and Step 2 are not in any particular order.

10. The control method for a metal flexible hose water cannon according to claim 9, characterized in that, In step 2], adjusting the position and shape of the center arc of the metal hose (3) specifically involves: Adjust the center arc of the connection between the metal hose (3) and the horizontal rotary seat (11) to be perpendicular to the top of the horizontal rotary seat (11), and the center arc of the connection between the metal hose (3) and the gun head (10) to be tangent to the central axis of the gun head (10), and make its radius of curvature 360mm-2250mm.

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