Metal hose water cannon and control method thereof

Abstract

The invention relates to a water cannon and a control method thereof, in particular to a metal hose water cannon and a control method thereof, and solves the technical problems that an existing water cannon is difficult to realize a good fluid flowing state and a compact water cannon structure at the same time, the number of bent pipes is large, the bending angle is large, energy loss is easily caused, and the performance of the water cannon is not favorably improved. The metal hose water cannon further comprises a first electric push rod, a first mechanical control unit, a second mechanical control unit, a third mechanical control unit, a horizontal rotating seat and a metal hose. The third mechanical control unit is used for enabling the horizontal revolving bed, the metal hose and the monitor head to rotate around the monitor base so as to adjust the horizontal revolving angle of the water monitor; the first mechanical control unit is used for cooperatively moving with the first electric push rod to adjust the center arc position and form of the metal hose; the second mechanical control unit is used for cooperatively moving with the first electric push rod to adjust the rotation angle of the monitor head. According to the method, the position and angle of the water cannon can be efficiently and stably controlled.

Description

Technical Field

[0001] The invention relates to a water cannon and a control method thereof, and in particular to a metal hose water cannon and a control method thereof. Background Art

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

[0003] Under the premise of ensuring the completion of the rotation action, the water cannon rotating structure must first consider the changes in the internal fluid flow state caused by the water cannon rotating structure, and secondly, the water cannon's overall structure must be compact and the transmission mechanism must be reasonably arranged. Excellent internal fluid flow means that when the fluid flows through the water cannon rotating structure, the flow direction should transition as smoothly as possible to avoid excessive and rapid changes in flow direction. The main influencing factors are the number of bends, bending angles, and curvature radius R at the bends in the water cannon rotating structure. The fewer the number of bends, the smaller the bending angle, and the larger the curvature radius R at the bend, the better the internal fluid flow state. The compact structure is also related to the above three factors. The more bends there are 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 determined, the larger the R / d value, the larger the length and width of the water cannon. For vehicle-mounted fixed water cannons or ship-mounted large-flow water cannons, they occupy more space. The smaller the R / d value, the more space can be saved but the performance of the water cannon is affected. Among them, the selection of the pipe diameter d value is directly related to the design flow rate. When the pipe diameter d is determined, the selection of the curvature radius R value not only affects the flow loss and fluid rotation flow performance of the water cannon, but also directly affects the compactness of the overall structure of the water cannon.

[0004] Through the study of the existing water cannon rotation structure, it is found that to realize the rotation of the water cannon, no matter which of the above three structures is adopted, it is difficult to achieve a good fluid flow state and a compact water cannon structure at the same time. The number of its bends is large, the bending angle is large, and the energy loss caused is also large, which is not conducive to improving the performance of the water cannon. The large rotation structure is conducive to improving the fluid flow state due to its large R / d value and large curvature radius, so that the turbulence degree of the fluid at the water cannon outlet is the lowest, and the water cannon range and the clustering of the water cannon jet are improved. However, the water cannon of this structure is relatively large, and the water flow energy loss caused by the pressure loss along the way is also the largest, which is not conducive to improving the performance of the water cannon; while the U-shaped rotation structure and the semi-rotation structure are more compact in volume, but because of the small R / d value and the small curvature radius R, the water flow direction changes more times and the change rate is faster, resulting in a high degree of turbulence, which is not conducive to improving the range of the water cannon and the clustering of the water cannon jet.

[0005] In summary, the existing water cannon structure has a large number of bends, a large bending angle and a small curvature radius at the bend, which causes fluid flow turbulence and energy loss, thereby affecting the water cannon range and water cannon jet bundling. Summary of the invention

[0006] The purpose of the present invention is to solve the technical problems that it is difficult for existing water cannons to simultaneously achieve good fluid flow conditions and compact water cannon structures, and that there are a large number of bends and a large bending angle, which easily cause energy loss and are not conducive to improving the performance of water cannons. A metal hose water cannon and a control method thereof are provided.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

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

[0009] The horizontal swivel seat is sleeved on the outer upper end of the gun base, and a gear is arranged on the outer side wall of the upper end of the gun base at a position corresponding to the horizontal swivel seat; the third mechanical control unit is arranged on the outer side wall of the horizontal swivel seat, and its output end is meshed with the gear, which is used to make the horizontal swivel seat, the metal hose and the gun head rotate around the gun base to realize the horizontal swivel angle adjustment of the water cannon;

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

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

[0012] The first mechanical control unit is arranged on the outer side wall of the top of the horizontal rotary seat, and its output end is meshed with the first worm gear, and is used for cooperating with the first electric push rod to adjust the central arc position and shape of the metal hose;

[0013] The second mechanical control unit is arranged on the outer side wall of the telescopic end of the first electric push rod, and its output end is meshed with the second worm gear, and is used for coordinated movement with the first electric push rod to adjust the rotation angle of the gun head.

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

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

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

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

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

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

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

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

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

[0023] Furthermore, the total bending times of the water cannon is 1 time, the maximum total bending angle is 125 degrees, and the minimum total bending angle is 20 degrees.

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

[0025] At the same time, the present invention also provides a control method for the above-mentioned metal hose water cannon, which is special in that it includes the following steps:

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

[0027] 2] Control the first mechanical control unit to drive the first electric push rod to rotate and automatically extend along the first fixed axis to adjust the central 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 and automatically extend along the second fixed axis to adjust the rotation angle of the gun head;

[0028] Step 1] and step 2] are performed in no particular order.

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

[0030] Adjust the center arc of the connection between the metal hose and the horizontal swivel seat to be perpendicular to the top of the horizontal swivel seat, 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, and make its curvature radius 360mm-2250mm.

[0031] Beneficial effects of the present invention:

[0032] 1. A metal hose water cannon of the present invention adopts a new rotary structure of a metal hose, a cannon head and a first mechanical control unit, a second mechanical control unit and a third mechanical control unit, so that the bending angle of the water cannon rotary structure is reduced by more than 65%, the number of bending times is reduced by more than 75%, and the curvature radius is increased by 2 to 7 times, thereby greatly improving the performance of the water cannon and solving the problems of water flow turbulence and energy loss. The rotary structure can increase the range of the water cannon by more than 5m, and the jet bunching can be measured by the outlet turbulent kinetic energy, which can be reduced by more than 5%.

[0033] 2. The metal hose water cannon of the present invention reduces the volume of the rotary structure, makes the water cannon structure more compact, and saves installation space.

[0034] 3. The metal hose water monitor of the present invention can efficiently and stably control the position and angle of the water monitor by using the first mechanical control unit, the second mechanical control unit and the third mechanical control unit, and can be self-locking at the same time, and can also be applied to the position and angle control of other soft tubes. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of an embodiment of a metal hose water monitor of the present invention;

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

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

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

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

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

[0041] Figure 7 It is a schematic diagram of a metal hose water cannon embodiment of the present invention in which the maximum depression angle of the water cannon is -35 degrees.

[0042] Description of reference numerals:

[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 seat. DETAILED DESCRIPTION

[0044] like Figure 1 , Figure 2 , Figure 3 As shown, a metal hose water cannon includes a gun base 1, a gun 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 rotating seat 11 and a metal hose 3 fixedly connected between the horizontal rotating seat 11 and the gun head 10.

[0045] A horizontal rotating seat 11 is sleeved on the outer upper end of the gun base 1, and a gear 101 is provided on the outer wall of the upper end of the gun base 1 at a position corresponding to the horizontal rotating seat 11; the third mechanical control unit 2 is provided on the outer wall of the horizontal rotating seat 11, and its output end is engaged with the gear 101, which is used to rotate the horizontal rotating seat 11, the metal hose 3 and the gun head 10 around the gun base 1 to achieve the horizontal rotation angle adjustment 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, and 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, a fixed end of which is rotatably mounted on the first fixed shaft 6, and a telescopic end is rotatably mounted on the second fixed shaft 9; one end of the first fixed shaft 6 is rotatably mounted with a first worm gear 501, which is located on the outside of 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; one end of the second fixed shaft 9 is fixedly connected to a second worm gear 502, which is located on the outside of the telescopic end of the first electric push rod 5.

[0047] The first mechanical control unit 7 is arranged on the outer side wall of the top of the horizontal swivel seat 11, and its output end is meshed with the first worm gear 501, and is used to coordinate with the first electric push rod 5 to adjust the central arc position and shape of the metal hose 3; the second mechanical control unit 8 is arranged on the outer side wall of the telescopic end of the first electric push rod 5, and its output end is meshed 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. Among them, the second mechanical control unit 8 is arranged on the outer side 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, the horizontal rotating seat 11 is sleeved on the outer upper end 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 a 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 is meshed with the gear 101, which is used to make the horizontal rotating seat 11 rotate around the gun base 1 to achieve the horizontal rotation angle adjustment of the water cannon. Among them, 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 to complete the horizontal rotation angle control of the water cannon.

[0049] A third fixed axis coaxial with the first fixed axis 6 is fixedly connected to the connection between the metal hose 3 and the horizontal rotating seat 11; a fourth fixed axis coaxial with the second fixed axis 9 is fixedly connected to the connection between the metal hose 3 and the gun head 10; the third fixed axis and the fourth fixed axis are located on the same side; the fixed end of the second electric push rod 4 can be rotatably mounted on the third fixed axis, and the telescopic end can be rotatably mounted on the fourth fixed axis, and 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; the motor is arranged on the outer side wall of the top of the horizontal rotating seat 11, and its output shaft is meshed with the first worm gear 501 through the worm; the structure of the second mechanical control unit 8 and the structure of the third mechanical control unit 2 are the same as the first mechanical control unit 7; the motor of the second mechanical control unit 8 is arranged on the outer side wall of the other end of the first electric push rod 5, and its output shaft is meshed with the second worm gear 502 through the worm; the motor of the third mechanical control unit 2 is arranged on the outer side wall of the horizontal rotating seat 11, and its output end is meshed with the gear 101 through the worm. The first mechanical control unit 7, the second mechanical control unit 8, and the third mechanical control unit 2 can all be self-locking, and can achieve position locking, so that the entire structure remains stable.

[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 can control the metal hose 3 to achieve the best bending degree when the water cannon rotates. The purpose is to select the best curvature radius. Because the metal hose 3 has a certain rigidity, the rigidity will be greater after the water pressure is increased. Therefore, the curvature of the metal hose 3 can be controlled by controlling the starting position and the end position of the metal hose 3: the center arc of the metal hose 3 is set as a standard arc, so that the center arc of the connection between the metal hose 3 and the horizontal rotating seat 11 is perpendicular to the top of the horizontal rotating seat 11, and the central axis of the gun head 10 is tangent to the end point of the center arc of the metal hose 3, which can achieve the smoothest flow of the fluid with the minimum energy loss. Since one end of the metal hose 3 is fixedly connected to the horizontal rotating seat 11, the position of this point is fixed, and it is set as the arc starting point of the metal hose 3. The other end of the metal hose 3 is fixedly connected to the gun head 10 and is set as the arc end point. If the length of the metal hose 3 is a fixed value, the arc length has been determined.

[0052] When the water cannon pitch angle is set, the central angle θ corresponding to the arc of the metal hose 3 can be obtained according to the following arc length formula:

[0053]

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

[0055] Because the central axis of the gun head 10 is tangent to the end point of the central arc of the metal hose 3, the relationship between the water cannon pitch angle α and the center angle θ corresponding to the arc satisfies α=90-θ; according to the above formula, when the water cannon pitch angle α is set, it can be achieved by adjusting the center angle θ corresponding to the arc, and the center 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 the horizontal position and the vertical position, which cannot be satisfied by a single linear motion. Therefore, a first mechanical control unit 7 and a second mechanical control unit 8 are designed, and the electric push rods (i.e., the first electric push rod 5 and the second electric push rod 4) can move telescopically to realize 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 two movements are combined to realize the control of the horizontal and vertical directions of the end point of the metal hose 3.

[0057] When the elevation angle α of the water cannon is known, the extension amount X of the electric push rod and the motor rotation angle A of the first mechanical control unit 7 can be calculated by the chord length formula. The rotation angle of the first electric push rod 5 is kA, where k represents the transmission coefficient and is a fixed value. Then the second mechanical control unit 8 is controlled to realize the shape of the metal hose 3 and the end position control of the center arc of the metal hose 3, so that the best posture of the metal hose 3 is maintained to optimize the flow state of the fluid inside the water cannon. At the same time, the first electric push rod 5, the second electric push rod 4, and the second mechanical control unit 8 play the role of fixing the gun head 10. Because the metal hose 3 lacks sufficient supporting force, the first electric push rod 5 and the second electric push rod 4 are needed to fix the gun head 10 to prevent the gun head 10 from shifting.

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

[0059] The total bending times of a metal hose water cannon of the present invention is 1 time, the maximum total bending angle is 125 degrees, and the minimum total bending angle is 20 degrees, which greatly reduces the pipe bending angle and the number of bending times; taking a water cannon of the same specification as an example, using a metal hose water cannon of the present invention, when the water cannon is at the maximum bending angle, the curvature radius of the metal hose 3 is 360mm, and when the water cannon is at the minimum bending angle, the curvature radius of the metal hose 3 is 250mm. The maximum rotation angle (maximum elevation angle) of the cannon head 10 is 70 degrees, and the minimum (minimum depression angle) is -35 degrees; Figure 5 This is a schematic diagram of the maximum elevation angle of the water monitor when it is working is 70 degrees. Figure 6 This is a schematic diagram of the maximum elevation angle of the water monitor when it is working, which is a commonly used elevation angle of 30 degrees. Figure 7 This is a schematic diagram of the maximum depression angle of -35 degrees.

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

[0061] The existing water cannon rotary structure has a minimum bending number of 4 times, a minimum total bending angle of more than 360 degrees, a maximum curvature radius of about 330 mm, and a minimum of about 180 mm. In comparison, the bending angle, bending number, and curvature radius have been significantly optimized. The problems of water flow turbulence, energy loss, and large water cannon volume caused by these reasons have been improved, and the performance of the water cannon, namely, the range of the water cannon, the jet beam, and the compact structure can be improved. Due to the self-locking property of the worm gear transmission, the cannon head 10 can also be self-locking.

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

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

[0064] 2] Control the first mechanical control unit 7 to drive the first electric push rod 5 to rotate and automatically extend along the first fixed axis 6 to adjust the central 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 and automatically extend along the second fixed axis 9 to adjust the rotation angle of the gun head 10;

[0065] When the center arc of the connection between the metal hose 3 and the horizontal rotating seat 11 is adjusted to be perpendicular to the top of the horizontal rotating seat 11, the center 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 the curvature radius is 360mm-2250mm. Step 1] and step 2] are not in 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 rotating seat (11), and a metal hose (3) fixedly connected between the horizontal rotating seat (11) and the gun head (10); The horizontal rotating seat (11) is sleeved on the outer upper end 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 a 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 is meshed 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 achieve horizontal rotation angle adjustment 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), 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, the fixed end of which is rotatably sleeved on the first fixed shaft (6), and the telescopic end is rotatably sleeved on the second fixed shaft (9); one end of the first fixed shaft (6) is rotatably sleeved with a first worm gear (501), 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); one end of the second fixed shaft (9) is fixedly connected with a second worm gear (502), 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 arranged on the outer side wall of the top of the horizontal rotating seat (11), and its output end is meshed with the first worm gear (501) and is used to coordinate movement with the first electric push rod (5) to adjust the central arc position and shape of the metal hose (3); The second mechanical control unit (8) is arranged on the outer side wall of the telescopic end of the first electric push rod (5), and its output end is meshed with the second worm gear (502) for coordinated movement with the first electric push rod (5) to adjust the rotation angle of the gun head (10).

2. A metal hose water monitor according to claim 1, characterized in that: Also includes a second electric push rod (4); A third fixed shaft coaxial with the first fixed shaft (6) is fixedly connected to the connection between the metal hose (3) and the horizontal rotating seat (11); a fourth fixed shaft coaxial with the second fixed shaft (9) is fixedly connected to the connection between the metal hose (3) and the gun head (10); The fixed end of the second electric push rod (4) can be rotatably mounted on the third fixed shaft, and the telescopic end can be rotatably mounted 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 monitor according to claim 2, characterized in that: The first mechanical control unit (7) comprises a motor and a worm; The motor is arranged on the outer side wall of the top of the horizontal rotary seat (11), and its output shaft is meshed with the first worm wheel (501) through a worm; 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 arranged on the outer wall of the other end of the first electric push rod (5), and its output shaft is meshed with the second worm wheel (502) through a worm; the motor of the third mechanical control unit (2) is arranged on the outer wall of the horizontal rotating seat (11), and its output end is meshed with the gear (101) through a worm.

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

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

7. A metal hose water monitor according to claim 1, characterized in that: The total bending times of the water cannon is 1 time, the maximum total bending angle is 125 degrees, and the minimum total bending angle is 20 degrees.

8. A metal hose water monitor 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 monitor according to any one of claims 1 to 8, characterized in that: The following steps are involved: 1] Controlling the third mechanical control unit (2) to adjust the horizontal rotation angle of the horizontal rotation seat (11); 2] Controlling 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, thereby adjusting the central arc position and shape of the metal hose (3); at the same time, controlling 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, thereby adjusting the rotation angle of the gun head (10); Step 1] and step 2] are performed in no particular order.

10. A method for controlling a metal hose water monitor according to claim 9, characterized in that: In step 2], the adjustment of the central arc position and shape of the metal hose (3) is specifically as follows: The center arc of the connection between the metal hose (3) and the horizontal swivel seat (11) is adjusted to be perpendicular to the top of the horizontal swivel seat (11), the center 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 the radius of curvature is 360mm-2250mm.

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