Fire water monitor

Abstract

The utility model relates to the technical field of fire fighting equipment, in particular to a fire water monitor. The fire water monitor comprises a first barrel and a second barrel, wherein the first end of the first barrel is used for being connected with a water hose; the second barrel comprises a first L-shaped barrel and a second L-shaped barrel; the first end of the first L-shaped barrel is movably connected with the second end of the first barrel body, the first end of the second L-shaped barrel is movably connected with the second end of the first L-shaped barrel, and the second end of the second L-shaped barrel is provided with a water cannon head; wherein the first L-shaped cylinder can rotate by taking the axis of the first cylinder body as the center; the second L-shaped cylinder can rotate with the center of the second end of the first L-shaped cylinder as the center. According to the fire water monitor, the first barrel, the first L-shaped barrel and the second L-shaped barrel are sequentially and movably connected, a firefighter can rotate the first L-shaped barrel and / or the second L-shaped barrel according to the position of an area to be extinguished, so that the water monitor head is adjusted to the target position, and then the fire extinguishing efficiency of the firefighter is improved.

Description

Technical Field

[0001] This utility model relates to the field of fire protection equipment technology, and in particular to a fire monitor. Background Technology

[0002] Fire monitors use a certain pressure and volume of water, through energy conversion, to spray it out at a high speed from the nozzle, forming a jet that can extinguish fires at a certain distance. They are widely used in flammable and explosive petrochemical enterprises, oil tank areas, oil terminals, hangars, ships, and other fire-prone areas.

[0003] Traditional fire monitors typically require firefighters to hold the monitor and adjust its position before the water jets or mist can reach the target area. This makes them inconvenient to use, and the water jets or mist cannot accurately reach the target area, thus affecting the firefighters' firefighting efficiency. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0005] Therefore, this utility model provides a fire monitor that, without adjusting the overall position of the fire monitor, allows the water head to be adjusted to the target position, so that the water jet from the water head can extinguish the fire in the target area, thereby improving the fire extinguishing efficiency of firefighters.

[0006] A fire monitor according to an embodiment of the present utility model includes:

[0007] The first cylinder, with its first end used for connection to the water hose;

[0008] The second cylinder includes a first L-shaped cylinder and a second L-shaped cylinder; the first end of the first L-shaped cylinder is movably connected to the second end of the first cylinder, the first end of the second L-shaped cylinder is movably connected to the second end of the first L-shaped cylinder, and the second end of the second L-shaped cylinder is provided with a water cannon head;

[0009] The first L-shaped cylinder can rotate around the axis of the first cylinder body; the second L-shaped cylinder can rotate around the center of the second end of the first L-shaped cylinder.

[0010] Optionally, the second end of the second L-shaped cylinder is detachably connected to the water cannon head.

[0011] Optionally, the water cannon head is a fan-shaped nozzle, which includes:

[0012] The first nozzle body is detachably connected to the second end of the second L-shaped cylinder; the first nozzle body is provided with a fan-shaped cavity, and the fan-shaped cavity is provided with an arc-shaped nozzle and a water inlet. The water inlet is smaller than the arc-shaped nozzle, and the water inlet can be connected to the cylinder cavity of the second L-shaped cylinder. The arc-shaped nozzle is used to make the water flow spray out in the form of a fan-shaped water curtain.

[0013] Optionally, the water cannon head is a direct current nozzle, which includes:

[0014] The second nozzle body is detachably connected to the second end of the second L-shaped cylinder; the second nozzle body is provided with a frustum-shaped cavity, the first end of the frustum-shaped cavity is provided with a direct current nozzle, and the second end of the frustum-shaped cavity can be connected to the cylinder cavity of the second L-shaped cylinder; the radius of the first end of the frustum-shaped cavity is greater than the radius of the second end of the frustum-shaped cavity.

[0015] Optionally, a handle is mounted on the second L-shaped cylinder, which is used to drive the second L-shaped cylinder to rotate about the center of the second end of the first L-shaped cylinder.

[0016] Optionally, the first end of the first L-shaped cylinder and the second end of the first cylinder body are connected by a first threaded assembly; the first threaded assembly includes:

[0017] The first thread is provided on the outer wall of the first cylinder;

[0018] The second thread is located on the inner wall of the first L-shaped cylinder and can be connected with the first thread.

[0019] The first fixing member is used to fix the first cylinder onto the first L-shaped cylinder after the first cylinder and / or the first L-shaped cylinder have been rotated and adjusted in position by the engagement of the first thread and the second thread.

[0020] Optionally, the first end of the first L-shaped cylinder and the second end of the second L-shaped cylinder are connected by a second threaded assembly; the second threaded assembly includes:

[0021] The third thread is provided on the outer wall of the first L-shaped cylinder;

[0022] The fourth thread is located on the inner wall of the second L-shaped cylinder and can be connected with the third thread.

[0023] The second fixing member is used to fix the second L-shaped cylinder on the first L-shaped cylinder after the first L-shaped cylinder and / or the second L-shaped cylinder have been rotated and adjusted in position by the cooperation of the third thread and the fourth thread.

[0024] Optionally, the first end of the first cylinder is provided with a quick-connect interface for detachable connection with a water hose.

[0025] Optionally, the first L-shaped cylinder includes a first cylinder section and a second cylinder section that are interconnected, the axis of the first cylinder section is perpendicular to the axis of the second cylinder section, and the end of the first cylinder section away from the second cylinder section is connected to the first cylinder body.

[0026] Optionally, the second L-shaped cylinder includes a third cylinder section and a fourth cylinder section that are connected to each other. The axis of the third cylinder section is perpendicular to the axis of the fourth cylinder section. The end of the third cylinder section away from the fourth cylinder section is connected to the first L-shaped cylinder, and the end of the fourth cylinder section away from the third cylinder section is connected to the water cannon head.

[0027] One of the above technical solutions has at least the following advantages or beneficial effects:

[0028] In one embodiment of this utility model, a fire monitor is designed with a second cylinder that is movably connected to a first L-shaped cylinder. This movable connection allows the first L-shaped cylinder to rotate about its axis, and the second L-shaped cylinder to rotate about the center of the second end of the first L-shaped cylinder. This facilitates firefighters adjusting the position of the monitor head by rotating the first and / or second L-shaped cylinders. Therefore, the fire monitor provided by this utility model, through the sequential movable connection of the first cylinder, the first L-shaped cylinder, and the second L-shaped cylinder, allows firefighters to adjust the monitor head to the target position simply by rotating the first and / or second L-shaped cylinders, without needing to adjust the overall position of the fire monitor, thereby improving firefighting efficiency. Attached Figure Description

[0029] Figure 1 A schematic diagram of the structure of a fire monitor according to an embodiment of the present invention is shown;

[0030] Figure 2 An exploded view of a fire monitor according to an embodiment of the present invention is shown;

[0031] Figure 3 A schematic diagram of the structure of a fire monitor according to another embodiment of the present invention is shown.

[0032] [Explanation of Labels in the Attached Image]

[0033] 1. First cylinder;

[0034] 2. Second cylinder body; 201. First L-shaped cylinder; 202. Second L-shaped cylinder; 2011. First cylinder section; 2012. Second cylinder section; 2021. Third cylinder section; 2022. Fourth cylinder section;

[0035] 3. Fan-shaped nozzle, 301. First nozzle body, 302. Fan-shaped cavity;

[0036] 4. DC nozzle, 401. Second nozzle body, 402. Frustum-shaped cavity;

[0037] 5. Handle;

[0038] 6. First fastener;

[0039] 7. Second fastener. Detailed Implementation

[0040] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] Fire monitors are fire extinguishing devices that use water as a medium to extinguish fires from a distance. Because fire monitors have a large water output and a long spray distance, they are generally used to extinguish large-scale fires.

[0042] In the use of traditional fire monitors, firefighters need to adjust the overall position of the monitor in order for the water jets or mist to be sprayed onto the target area. Therefore, these fire monitors are inconvenient to use, and the water jets or mist cannot be accurately sprayed onto the target area, thus affecting the firefighters' firefighting efficiency.

[0043] To address at least one of the technical problems existing in the prior art or related technologies, this utility model provides a fire monitor, comprising a first cylinder and a second cylinder. The first end of the first cylinder is used to connect to a fire hose. The second cylinder includes a first L-shaped cylinder and a second L-shaped cylinder. The first end of the first L-shaped cylinder and the second end of the first cylinder are movably connected, and the first end of the second L-shaped cylinder and the second end of the first L-shaped cylinder are also movably connected. A water cannon head is provided at the second end of the second L-shaped cylinder. The first L-shaped cylinder can rotate around the axis of the first cylinder, and the second L-shaped cylinder can rotate around the center of the second end of the first L-shaped cylinder. This utility model, by designing the second cylinder as a structure where the first L-shaped cylinder and the second L-shaped cylinder are movably connected, allows the first L-shaped cylinder to rotate around its axis and the second L-shaped cylinder to rotate around the center of the second end of the first L-shaped cylinder. This facilitates firefighters in adjusting the position of the water cannon head on the fire monitor by rotating the first L-shaped cylinder and / or the second L-shaped cylinder. Therefore, the fire monitor provided by this utility model, through the sequential movable connection of the first cylinder, the first L-shaped cylinder, and the second L-shaped cylinder, enables firefighters to adjust the water cannon head to the target position simply by rotating the first L-shaped cylinder and / or the second L-shaped cylinder, without adjusting the overall position of the fire monitor, based on the location of the area to be extinguished, so that the water jet from the water cannon head can extinguish the fire in the target area, thereby improving the fire extinguishing efficiency of firefighters.

[0044] The following describes some embodiments of fire monitors provided according to the present invention with reference to the accompanying drawings.

[0045] See Figures 1 to 3 A fire monitor according to one embodiment of the present invention includes a first cylinder 1 and a second cylinder 2. The first end of the first cylinder 1 is used to connect to a water hose. The second cylinder 2 includes a first L-shaped cylinder 201 and a second L-shaped cylinder 202. The first end of the first L-shaped cylinder 201 is movably connected to the second end of the first cylinder 1, and the first end of the second L-shaped cylinder 202 is movably connected to the second end of the first L-shaped cylinder 201. The second end of the second L-shaped cylinder 202 is provided with a water cannon head. The first L-shaped cylinder 201 can rotate about the axis of the first cylinder 1. The second L-shaped cylinder 202 can rotate about the center of the second end of the first L-shaped cylinder 201.

[0046] Here, after the second end of the first cylinder 1 is movably connected to the first end of the first L-shaped cylinder 201, and the first end of the second L-shaped cylinder 202 is movably connected to the second end of the first L-shaped cylinder 201, the first cylinder 1, the first L-shaped cylinder 201 and the second L-shaped cylinder 202 are assembled into a Z-shaped structure.

[0047] It should be noted that the first cylinder 1, the second cylinder 2, and the water cannon head can all be made of stainless steel.

[0048] In this embodiment, by designing the second cylinder 2 as a structure in which the first L-shaped cylinder 201 and the second L-shaped cylinder 202 are movably connected, the first cylinder 1 and the first L-shaped cylinder 201 are movably connected so that the first L-shaped cylinder 201 can rotate on the first cylinder 1 about the axis of the first cylinder 1, and the second L-shaped cylinder 202 can rotate on the first L-shaped cylinder 201 about the center of the second end of the first L-shaped cylinder 201. This makes it easier for firefighters to adjust the position of the water cannon head on the fire monitor by rotating the first L-shaped cylinder 201 and / or the second L-shaped cylinder 202. Therefore, the fire monitor provided by this utility model, through the sequential movable connection of the first cylinder 1, the first L-shaped cylinder 201, and the second L-shaped cylinder 202, enables firefighters to adjust the water cannon head to the target position simply by rotating the first L-shaped cylinder 201 and / or the second L-shaped cylinder 202, without adjusting the overall position of the fire monitor, based on the location of the area to be extinguished, so that the water jet from the water cannon head can extinguish the fire in the target area, thereby improving the fire extinguishing efficiency of firefighters.

[0049] In some possible embodiments, the second end of the second L-shaped cylinder 202 is detachably connected to the water cannon head.

[0050] In this embodiment, by detachably connecting the second end of the second L-shaped cylinder 202 to the water cannon head, the connection flexibility between the second L-shaped cylinder 202 and the water cannon head can be improved, so as to facilitate the maintenance and replacement of the water cannon head.

[0051] In some possible implementations, see [link to relevant documentation]. Figure 1 and 2 The water cannon head is a fan-shaped nozzle 3. The fan-shaped nozzle 3 includes a first nozzle body 301, which is detachably connected to the second end of the second L-shaped cylinder 202. The first nozzle body 301 is provided with a fan-shaped cavity 302. The fan-shaped cavity 302 is provided with an arc-shaped nozzle and a water inlet. The water inlet is smaller than the arc-shaped nozzle and can be connected to the cylinder cavity of the second L-shaped cylinder 202. The arc-shaped nozzle is used to make the water flow spray out in the form of a fan-shaped water curtain.

[0052] It should be noted that the central angle corresponding to the sector cavity 302 is no greater than 150°. The sector cavity 302 includes two sector walls arranged opposite each other, and inclined side walls located on both sides of the two sector walls. The arc-shaped nozzle of the sector cavity 302 is located at the end of the first nozzle body 301 away from the second L-shaped cylinder 202.

[0053] Here, the first nozzle body 301 can be axially rotated with the second end of the second L-shaped cylinder 202 so that the firefighter can adjust the installation angle of the first nozzle body 301 on the second L-shaped cylinder 202 until the fan-shaped water curtain sprayed from the fan-shaped cavity 302 can cover the surface of the wall to be extinguished, so as to achieve spraying of the surface of the wall to be extinguished.

[0054] In this embodiment, by selecting a fan-shaped nozzle 3 as the water cannon head and setting a fan-shaped cavity 302 inside the first nozzle body 301, the fan-shaped water curtain sprayed through the arc-shaped nozzle on the fan-shaped cavity 302 covers the surface of the wall to be extinguished, thereby achieving large-area spraying of the surface of the wall to be extinguished and accelerating the fire extinguishing of the wall.

[0055] In some possible implementations, see [link to relevant documentation]. Figure 3 The water cannon head is a DC nozzle 4, which includes a second nozzle body 401. The second nozzle body 401 is detachably connected to the second end of the second L-shaped cylinder 202. The second nozzle body 401 has a frustum-shaped cavity 402 inside. The first end of the frustum-shaped cavity 402 has a DC nozzle, and the second end of the frustum-shaped cavity 402 can communicate with the cylinder cavity of the second L-shaped cylinder 202. The radius of the first end of the frustum-shaped cavity 402 is larger than the radius of the second end of the frustum-shaped cavity 402.

[0056] Here, the DC nozzle is located at the first end of the frustum cavity 402, and the second end of the frustum cavity 402 is connected to the cavity of the second L-shaped cylinder 202, so that the diameter of the water jet sprayed by the second nozzle body 401 is greater than the diameter of the second end of the frustum cavity 402; wherein, the water jet sprayed by the DC nozzle 4 can be sprayed out in the form of a straight water jet.

[0057] In this embodiment, by selecting a direct current nozzle 4 as the water cannon head, and setting a frustum-shaped cavity 402 in the second nozzle body 401, and setting a direct current nozzle at the first end of the frustum-shaped cavity 402, the straight water flow sprayed through the direct current nozzle on the frustum-shaped cavity 402 can cover the target area to be extinguished, so as to achieve targeted fire extinguishing of the target area to be extinguished and accelerate the fire extinguishing of the target area to be extinguished.

[0058] In some possible embodiments, a handle 5 is mounted on the second L-shaped cylinder 202, the handle 5 being used to drive the second L-shaped cylinder 202 to rotate about the center of the second end of the first L-shaped cylinder 201.

[0059] Here, by installing a handle 5 on the second L-shaped cylinder 202, firefighters can drive the second L-shaped cylinder 202 to rotate around the center of the second end of the first L-shaped cylinder 201 by holding the handle 5, which makes it easier for firefighters to adjust the position of the second L-shaped cylinder 202.

[0060] In some possible embodiments, the first end of the first L-shaped cylinder 201 and the second end of the first cylinder 1 are connected by a first threaded assembly; the first threaded assembly includes a first thread, a second thread and a first fixing member 6, the first thread is provided on the outer wall of the first cylinder 1; the second thread is provided on the inner wall of the first L-shaped cylinder 201 and can be connected with the first thread; after the first cylinder 1 and / or the first L-shaped cylinder 201 have completed the position adjustment by rotating with the cooperation of the first thread and the second thread, the first fixing member 6 is used to fix the first cylinder 1 on the first L-shaped cylinder 201.

[0061] A sealing ring can be fitted on the outside of the first thread to keep the connection between the first L-shaped cylinder 201 and the first cylinder body 1 sealed.

[0062] Here, the first fixing member 6 may include a first fixing rod and a first knob. The first end of the first fixing rod is provided with a thread, and the second end of the first fixing rod is connected to the first knob. The first L-shaped cylinder 201 is provided with a first threaded hole, and the first threaded hole is a through hole, wherein the first threaded hole can be connected to the thread on the first fixing rod.

[0063] When the firefighter adjusts the position of the first L-shaped cylinder 201, the first fixing rod can be rotated in the first threaded hole by the first knob, so that the first end of the first fixing rod is away from the first cylinder 1. Then, the first L-shaped cylinder 201 is rotated on the first cylinder 1 through the cooperation of the first thread and the second thread until the first L-shaped cylinder 201 is rotated to the target position. Then, the first fixing rod is rotated in the first threaded hole by the first knob, so that the first end of the first fixing rod abuts against the outer wall of the first cylinder 1, thereby completing the fixation of the first cylinder 1 on the first L-shaped cylinder 201.

[0064] In some possible embodiments, the first end of the first L-shaped cylinder 201 and the second end of the second L-shaped cylinder 202 are connected by a second threaded assembly; the second threaded assembly includes a third thread, a fourth thread, and a second fixing member 7. The third thread is provided on the outer wall of the first L-shaped cylinder 201; the fourth thread is provided on the inner wall of the second L-shaped cylinder 202 and can be connected with the third thread; after the first L-shaped cylinder 201 and / or the second L-shaped cylinder have completed their position adjustment by rotating with the cooperation of the third thread and the fourth thread, the second fixing member 7 is used to fix the second L-shaped cylinder 202 on the first L-shaped cylinder 201.

[0065] A sealing ring can be fitted on the outside of the third thread to keep the connection between the first L-shaped cylinder 201 and the second L-shaped cylinder 202 sealed.

[0066] Here, the second fixing member 7 may include a second fixing rod and a second knob. The first end of the second fixing rod is provided with a thread, and the second end of the second fixing rod is connected to the second knob. The second L-shaped cylinder 202 is provided with a second threaded hole, and the second threaded hole is a through hole, wherein the second threaded hole can be connected to the thread on the second fixing rod.

[0067] When firefighters adjust the position of the second L-shaped cylinder 202, they can use the second knob to rotate the second fixing rod in the second threaded hole, so that the first end of the second fixing rod moves away from the outer wall of the first L-shaped cylinder 201. Then, the second L-shaped cylinder 202 rotates on the first L-shaped cylinder 201 through the cooperation of the third and fourth threads until the second L-shaped cylinder 202 rotates to the target position. Then, the second knob is used to rotate the second fixing rod in the second threaded hole, so that the first end of the second fixing rod abuts against the outer wall of the first L-shaped cylinder 201, thus completing the fixation of the second L-shaped cylinder 202 on the first L-shaped cylinder 201.

[0068] In some possible embodiments, the first end of the first cylinder 1 is provided with a quick-connect interface for detachable connection with a water hose.

[0069] Here, by providing a quick-connect interface at the first end of the first cylinder 1, the water hose can be quickly connected to the first cylinder 1 through the connection with the quick-connect interface, so that firefighters can easily connect and disconnect the water hose at the first end of the first cylinder 1.

[0070] In some possible embodiments, the first L-shaped cylinder 201 includes a first cylinder section 2011 and a second cylinder section 2012 that are in communication with each other. The axis of the first cylinder section 2011 is perpendicular to the axis of the second cylinder section 2012, and the end of the first cylinder section 2011 away from the second cylinder section 2012 is connected to the first cylinder body 1.

[0071] Here, the axis of the first cylindrical section 2011 is perpendicular to the axis of the second cylindrical section 2012, and the end of the first cylindrical section 2011 away from the second cylindrical section 2012 is connected to the first cylindrical body 1. The end of the second cylindrical section 2012 away from the first cylindrical section 2011 is connected to the second L-shaped cylinder 202. This allows the second L-shaped cylinder 202 connected to the second cylindrical section 2012 to be located on one side of the first cylindrical body 1, facilitating the rotation of the second L-shaped cylinder 202 located on one side of the first cylindrical body 1. A transition bend is provided between the first cylindrical section 2011 and the second cylindrical section 2012.

[0072] In some possible embodiments, the second L-shaped cylinder 202 includes a third cylinder section 2021 and a fourth cylinder section 2022 that are in communication with each other. The axis of the third cylinder section 2021 is perpendicular to the axis of the fourth cylinder section 2022. The end of the third cylinder section 2021 away from the fourth cylinder section 2022 is connected to the first L-shaped cylinder 201, and the end of the fourth cylinder section 2022 away from the third cylinder section 2021 is connected to the water cannon head.

[0073] Among them, a transition bend is provided between the third section 2021 and the fourth section 2022.

[0074] Here, the axis of the third cylinder section 2021 is perpendicular to the axis of the fourth cylinder section 2022, and the end of the third cylinder section 2021 away from the fourth cylinder section 2022 is connected to the first L-shaped cylinder 201. This makes the axis of the fourth cylinder section 2022 parallel to the axis of the first cylinder section 2011, so as to avoid the water cannon head colliding with the first L-shaped cylinder 201 or the first cylinder body 1 when the second L-shaped cylinder 202 rotates on the first L-shaped cylinder 201.

[0075] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0076] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0077] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0078] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "exemplary embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0079] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A fire monitor characterized by, The utility model relates to a water cannon, including: a first cylinder, a first end is used for connecting with the water hose; a second cylinder, including first L cylinder and second L cylinder; the first end of first L cylinder and the second end of first cylinder are movably connected, the first end of second L cylinder and the second end of first L cylinder are movably connected, and the second end of second L cylinder is equipped with water cannon head; Wherein, the first L cylinder can rotate around the axis of the first cylinder as the center, and the second L cylinder can rotate around the center of the second end of the first L cylinder as the center.

2. The fire monitor of claim 1, wherein The second end of the second L cylinder is detachably connected with the water cannon head.

3. The fire monitor of claim 2, wherein, The water cannon head is a fan-shaped spray head, and the fan-shaped spray head includes: a first spray head body, which is detachably connected with the second end of the second L cylinder; a fan-shaped cavity is arranged in the first spray head body; an arc-shaped spray opening and a water inlet are arranged on the fan-shaped cavity; the water inlet is smaller than the arc-shaped spray opening; the water inlet is in communication with the cylinder cavity of the second L cylinder; and the arc-shaped spray opening is used for spraying water in the form of a fan-shaped water curtain.

4. The fire monitor of claim 2, wherein, The water cannon head is a straight-flow spray head, and the straight-flow spray head includes: a second spray head body, which is detachably connected with the second end of the second L cylinder; a circular-truncated-cone-shaped cavity is arranged in the second spray head body; a straight-flow spray opening is arranged at the first end of the circular-truncated-cone-shaped cavity; the second end of the circular-truncated-cone-shaped cavity is in communication with the cylinder cavity of the second L cylinder; and the radius of the first end of the circular-truncated-cone-shaped cavity is greater than the radius of the second end of the circular-truncated-cone-shaped cavity.

5. The fire monitor of claim 1, wherein A handle is arranged on the second L cylinder, and the handle is used for driving the second L cylinder to rotate around the center of the second end of the first L cylinder.

6. The fire monitor of claim 1, wherein The first end of the first L cylinder and the second end of the first cylinder are connected through a first threaded assembly; the first threaded assembly includes: a first thread, which is arranged on the outer wall of the first cylinder; a second thread, which is arranged on the inner wall of the first L cylinder and is connectable with the first thread; a first fixing member, which is used for fixing the first cylinder on the first L cylinder after the first cylinder and / or the first L cylinder are adjusted in position through the cooperation of the first thread and the second thread.

7. The fire monitor of claim 1, wherein The first end of the first L cylinder and the second end of the second L cylinder are connected through a second threaded assembly; the second threaded assembly includes: a third thread, which is arranged on the outer wall of the first L cylinder; a fourth thread, which is arranged on the inner wall of the second L cylinder and is connectable with the third thread; a second fixing member, which is used for fixing the second L cylinder on the first L cylinder after the first L cylinder and / or the second L cylinder are adjusted in position through the cooperation of the third thread and the fourth thread.

8. A fire monitor according to any one of claims 1 to 7, characterized in that The first end of the first cylinder is provided with a quick connector, and the quick connector is used for detachably connecting with the water hose.

9. A fire monitor according to any one of claims 1 to 7, characterized in that The first L cylinder includes a first cylinder segment and a second cylinder segment that are in communication with each other; the axis of the first cylinder segment is perpendicular to the axis of the second cylinder segment; and the end of the first cylinder segment, which is away from the second cylinder segment, is connected with the first cylinder.

10. A fire monitor according to any one of claims 1 to 7, characterized in that The second L-shaped barrel comprises a third barrel section and a fourth barrel section which are in communication with each other, the axis of the third barrel section is perpendicular to the axis of the fourth barrel section, one end of the third barrel section away from the fourth barrel section is connected with the first L-shaped barrel, and one end of the fourth barrel section away from the third barrel section is connected with the water cannon head.

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