Spraying device and fully mechanized coal mining face

Abstract

The utility model relates to the technical field of coal mining equipment, and discloses a spraying device and a fully mechanized coal mining face. The spraying device comprises a first liquid storage tank, a piston and a driving assembly. A liquid storage cavity is formed in the first liquid storage tank and is used for storing a fire extinguishing solution; the first liquid storage tank is provided with a liquid inlet and a liquid outlet. The piston is installed in the liquid storage cavity, assembled with the liquid storage cavity in a sealed mode and matched with the first liquid storage box in a sliding mode in the first direction. The driving assembly is connected with the piston; the driving assembly drives the piston to reciprocate in the first direction so as to adjust the volume of the liquid storage cavity, so that the fire extinguishing solution enters the liquid storage cavity from the liquid inlet, and the fire extinguishing solution is discharged out of the liquid storage cavity from the liquid outlet. According to the fire extinguishing device, the piston and the driving assembly are arranged, when the driving assembly drives the piston to move in the forward direction and the reverse direction in the first direction, the volume of the liquid storage cavity is increased or decreased, and therefore the fire extinguishing solution is discharged out of the liquid storage box. Therefore, manpower can be saved, and spraying efficiency and operation speed are improved.

Description

Technical Field

[0001] This utility model relates to the field of coal mining equipment technology, and in particular to a spraying device and a fully mechanized mining face. Background Technology

[0002] A goaf in a coal mine refers to the void or cavity left after underground coal or gangue has been mined during coal mining operations. As the working face continues to advance, the exposed area of ​​the goaf gradually increases, and there will be air leakage at the working face. Some airflow entering the goaf may cause the residual coal to spontaneously combust, thereby affecting the normal production of the working face.

[0003] At present, coal mine goaf areas are generally protected by manually spraying inhibitors. Traditional inhibitor spraying fire prevention and extinguishing equipment has the following disadvantages: (1) manual spraying of inhibitors is inefficient, slow, and the concentration of inhibitors is uneven; (2) the structure is complex, there are many pipelines, the daily management and maintenance workload is large, and the labor intensity of workers is high; (3) a large amount of inhibitors are easily left above the support plate, which means that the inhibitors cannot really enter the goaf area and cannot play a role in fire prevention and extinguishing. Utility Model Content

[0004] This utility model provides a spraying device and a fully mechanized mining face to solve at least one of the defects in the prior art.

[0005] This utility model provides a spraying device, including:

[0006] The first liquid storage tank has an internal liquid storage chamber for storing fire extinguishing solution; the first liquid storage tank has an inlet and an outlet.

[0007] A piston is installed in the liquid storage chamber, the piston is sealed to the liquid storage chamber, and slides in cooperation with the first liquid storage tank in a first direction;

[0008] A drive assembly is connected to the piston; the drive assembly drives the piston to reciprocate along the first direction to adjust the volume of the liquid storage chamber, so that the extinguishing solution enters the liquid storage chamber from the inlet and exits the liquid storage chamber from the outlet.

[0009] According to the spraying device provided by this utility model, the driving component includes:

[0010] A first connecting rod, one end of which is hinged to the piston;

[0011] A crankshaft, which is hinged to the other end of the first connecting rod, is used to drive the piston to reciprocate along the first direction via the first connecting rod.

[0012] The spraying device provided by this utility model also includes:

[0013] The second storage tank is used to supply the fire extinguishing solution to the first storage tank;

[0014] An inlet pipe is installed at the inlet, and an inlet valve is installed on the inlet pipe. The inlet end of the inlet pipe is connected to the second storage tank.

[0015] A liquid outlet pipe is installed at the liquid outlet, and a liquid outlet valve is installed on the liquid outlet pipe.

[0016] The spraying device provided by this utility model also includes:

[0017] A spray assembly is disposed at the outlet end of the outlet pipe; the spray assembly is used to spray the fire extinguishing solution in the form of a water mist.

[0018] According to the spraying device provided by this utility model, the spraying assembly includes a rotating nozzle.

[0019] The spraying device provided by this utility model also includes:

[0020] A flow control unit is installed in the outlet pipe to control the flow rate of the outlet pipe.

[0021] The spraying device provided by this utility model also includes:

[0022] A filter screen is installed at the liquid outlet.

[0023] The second aspect of this utility model provides a fully mechanized mining face, including the spraying device described in any one of the above claims, wherein the spraying device is used to spray fire extinguishing solution into the goaf.

[0024] The fully mechanized mining face provided by this utility model also includes:

[0025] A hydraulic support, wherein the spraying device is installed on the top of the protective beam of the hydraulic support.

[0026] The fully mechanized mining face provided by this utility model also includes:

[0027] A temperature measurement system is used to detect temperature changes in the goaf area;

[0028] A control system is connected to the spraying device and the temperature measuring system; the control system is used to control the start and stop of the spraying device according to the temperature detected by the temperature measuring system.

[0029] The spraying device provided by this utility model, by setting a piston and a driving assembly, allows the driving assembly to drive the piston to reciprocate along a first direction to adjust the volume of the storage chamber. Specifically: when the driving assembly drives the piston to move forward along the first direction, the volume of the storage chamber increases, allowing the extinguishing solution to enter the storage chamber from the inlet; when the driving assembly drives the piston to move in the reverse direction, the volume of the storage chamber decreases, allowing the extinguishing solution to exit the storage chamber through the outlet. This saves manpower and improves spraying efficiency and operation speed.

[0030] The fully mechanized mining face provided by this utility model can spray fire extinguishing solution into the goaf area by setting up a spraying device to prevent spontaneous combustion of coal seams. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the spraying device provided by this utility model.

[0033] Figure 2 This is a schematic diagram of the layout of the spraying device provided by this utility model in a fully mechanized mining face.

[0034] Figure 3 This is a partial structural schematic diagram of the spraying device provided by this utility model.

[0035] Figure label:

[0036] 100. Spraying device; 110. First liquid storage tank; 111. Liquid storage chamber; 112. Liquid inlet; 113. Liquid outlet; 120. Piston; 130. Drive assembly; 131. First connecting rod; 132. Crankshaft; 140. Liquid inlet pipe; 141. Liquid inlet valve; 150. Liquid outlet pipe; 151. Liquid outlet valve; 152. Mounting bracket; 160. Spraying assembly; 170. Flow control unit; 180. Filter screen; 190. Transport trolley; 191. Chassis; 192. Wheel;

[0037] 200. Hydraulic support. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0039] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the embodiments of this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0041] In this embodiment of the 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 that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0042] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "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.

[0043] The following is combined with Figures 1 to 3 The structure and working principle of the spraying device of this utility model are explained in detail. Figure 1 This is a schematic diagram of the spraying device provided by this utility model. Figure 2 This is a schematic diagram of the layout of the spraying device provided by this utility model in a fully mechanized mining face. Figure 3 This is a partial structural schematic diagram of the spraying device provided by this utility model.

[0044] like Figure 1 As shown, a specific embodiment of the first aspect of this utility model provides a spraying device 100. The spraying device 100 includes a first liquid storage tank 110, a piston 120, and a drive assembly 130. The first liquid storage tank 110 has a liquid storage chamber 111 for storing fire extinguishing solution; the first liquid storage tank 110 has an inlet 112 and an outlet 113. The piston 120 is installed in the liquid storage chamber 111, and the piston 120 is sealed to the liquid storage chamber 111 and slidably engaged with the first liquid storage tank 110 along a first direction. The drive assembly 130 is connected to the piston 120; the drive assembly 130 drives the piston 120 to reciprocate along the first direction to adjust the volume of the liquid storage chamber 111, so that the fire extinguishing solution enters the liquid storage chamber 111 from the inlet 112 and exits the liquid storage chamber 111 from the outlet 113.

[0045] In this embodiment, by setting up a piston 120 and a drive assembly 130, the drive assembly 130 can drive the piston 120 to reciprocate along a first direction to adjust the volume of the liquid storage chamber 111. Specifically: when the drive assembly 130 drives the piston 120 to move forward along the first direction, the volume of the liquid storage chamber 111 increases, allowing the extinguishing solution to enter the liquid storage chamber 111 from the inlet 112; when the drive assembly 130 drives the piston 120 to move in the reverse direction along the first direction, the volume of the liquid storage chamber 111 decreases, allowing the extinguishing solution to be discharged from the liquid storage chamber 111 through the outlet 113. This can save manpower and improve spraying efficiency and operation speed.

[0046] Furthermore, the inlet 112 and outlet 113 of the first liquid storage tank 110 are arranged intersectingly. Specifically, the central axis of the inlet 112 intersects the central axis of the outlet 113. Preferably, the central axis of the inlet 112 and the central axis of the outlet 113 are perpendicular to each other. Allowing the extinguishing solution to enter the storage chamber 111 vertically increases the disturbance of the extinguishing solution within the storage chamber 111, improving the mixing uniformity of the extinguishing solution.

[0047] In some embodiments, the spraying device 100 further includes a stirring structure disposed in the liquid storage chamber 111, which is used to stir the fire extinguishing solution in the liquid storage chamber 111 to improve uniformity.

[0048] Understandably, the stirring structure is located in the liquid storage chamber 111 near the liquid outlet 113.

[0049] Understandably, the inner wall of the liquid storage chamber 111 is provided with a limiting protrusion to limit the extreme position of the piston 120 to the right, so as to prevent the piston 120 from interfering with the stirring structure.

[0050] Furthermore, the stirring structure includes a drive component and a stirring shaft; the drive component is installed on the outside of the first liquid storage tank 110, and the stirring shaft is installed in the mounting hole of the first liquid storage tank 110. The lower end of the stirring shaft is connected to the drive component, and the upper end is located in the liquid storage cavity 111; the drive component drives the stirring shaft to rotate. It can be understood that the stirring shaft is sealed to the mounting hole and can also rotate within the mounting hole. The drive component drives the stirring shaft to rotate, thereby agitating the fire extinguishing solution in the liquid storage cavity 111.

[0051] In some embodiments, the drive assembly 130 may be an electric actuator. The drive end of the electric actuator is connected to the piston 120, and the extension and retraction movement of the electric actuator can drive the piston 120 to reciprocate along a first direction. At this time, the extension and retraction direction of the electric actuator is parallel to the first direction.

[0052] In some embodiments, the drive component 130 may be a linear motor that drives the piston 120 to reciprocate along a first direction.

[0053] In some embodiments, the drive assembly 130 includes a first connecting rod 131 and a crankshaft 132; one end of the first connecting rod 131 is hinged to the piston 120. The crankshaft 132 is hinged to the other end of the first connecting rod 131, and the crankshaft 132 is used to drive the piston 120 to reciprocate along a first direction via the first connecting rod 131. At this time, the crankshaft 132, the first connecting rod 131, and the piston 120 form a crankshaft connecting rod structure, which can convert rotational motion into linear motion of the piston 120 along the first direction, reducing the volume of the spraying device 100 in the first direction and facilitating the miniaturization design of the spraying device 100.

[0054] In some embodiments, the spraying device 100 includes a second liquid storage tank, an inlet pipe 140, and an outlet pipe 150. The second liquid storage tank is used to provide extinguishing solution to the first liquid storage tank 110. The inlet pipe 140 is installed at the inlet port 112, and an inlet valve 141 is installed on the inlet pipe 140. The inlet end of the inlet pipe 140 is connected to the second liquid storage tank. The outlet pipe 150 is installed at the outlet port 113, and an outlet valve 151 is installed on the outlet pipe 150. By providing the inlet pipe 140, an installation base can be provided for the inlet valve 141, and it can also be used to connect the first liquid storage tank 110 and the second liquid storage tank, providing extinguishing solution to the first liquid storage tank 110. By providing the outlet pipe 150, the outlet port 113 of the first liquid storage tank 110 can be moved to any desired position according to actual conditions, increasing the extinguishing range.

[0055] Specifically, during the return stroke of the crankshaft 132, the first connecting rod 131 moves to the left in the first direction, the volume of the liquid storage chamber 111 gradually increases, the internal pressure gradually decreases, and a partial vacuum is formed inside the liquid storage chamber 111. The outlet valve 151 is closed, and the inlet valve 141 is open. Under the action of the internal and external pressure difference, the fire extinguishing solution in the second liquid storage tank enters the liquid storage chamber 111 through the inlet pipe 140. When the first connecting rod 131 moves to its leftmost position, the fire extinguishing solution in the second liquid storage tank stops entering the liquid storage chamber 111.

[0056] As the crankshaft 132 moves, the first connecting rod 131 moves to the right in the first direction, and the volume of the liquid storage chamber 111 gradually decreases. The fire extinguishing solution in the liquid storage chamber 111 is squeezed by the piston 120, increasing the pressure. The discharge valve 151 opens, and the fire extinguishing solution is discharged through the discharge pipe 150. When the process reaches its limit position, the volume of the liquid storage chamber 111 reaches its minimum, and the discharge process ends.

[0057] Furthermore, a mounting bracket 152 is provided on the outlet pipe 150; the mounting bracket 152 is used to install on the hydraulic support 200, which improves the installation stability of the outlet pipe 150.

[0058] like Figure 1 and Figure 3 As shown, in some embodiments, the spraying device 100 includes a spray assembly 160; the spray assembly 160 is disposed at the outlet end of the liquid outlet pipe 150; the spray assembly 160 is used to spray a water mist-like fire extinguishing solution. By setting the spray assembly 160, the water mist-like fire extinguishing solution can be discharged. At this time, the water mist-like fire extinguishing solution can drift to any leaky place in the goaf area by airflow, achieving the purpose of all-round fire extinguishing in the goaf area and improving the safe and efficient production of the mine.

[0059] Furthermore, the spray assembly 160 includes a rotating nozzle. By setting the rotating nozzle, the spray direction can be changed.

[0060] Specifically, as the crankshaft 132 continuously reciprocates, the process of liquid inlet and outlet is constantly carried out. Under the action of a certain internal and external pressure difference, the extinguishing solution can be atomized by the spray assembly 160 and drift to any leaking air in the goaf area with the airflow of the working face, achieving the purpose of all-round extinguishing in the goaf area and improving the safe and efficient production of the mine.

[0061] like Figure 3 As shown, in some embodiments, the spraying device 100 further includes a flow control unit 170; the flow control unit 170 is installed on the outlet pipe 150 and is used to control the flow rate of the outlet pipe 150. By setting the flow control unit 170, the discharge volume of the extinguishing solution can be adjusted according to the actual situation.

[0062] Furthermore, the flow control unit 170 includes an electro-hydraulic switch. This allows for more precise control of the extinguishing solution flow rate; when there is no extinguishing solution in the second reservoir, the electro-hydraulic switch can be turned off to prevent the crankshaft from idling.

[0063] In some embodiments, the spraying device 100 further includes a filter screen 180; the filter screen 180 is installed at the liquid outlet 113. By providing the filter screen 180, impurities can be prevented from entering the liquid outlet pipe 150.

[0064] In some embodiments, the spraying device 100 further includes a transport trolley 190; the first liquid storage tank 110 is placed on the transport trolley 190, and the transport trolley 190 makes it easier to move the first liquid storage tank 110.

[0065] Furthermore, the transport vehicle 190 includes a frame 191 and wheels 192; a first liquid storage tank 110 is placed on the frame 191; and the wheels 192 are mounted on the lower end of the frame 191.

[0066] It should be noted that the extinguishing solution contains an inhibitor. The inhibitor prevents spontaneous combustion of the coal seam. The inhibitor is a readily available product and will not be discussed further here.

[0067] In summary, the spraying device 100 of this embodiment is small in size, light in weight, easy to transport, and fully functional, making it suitable for the harsh natural environment of underground coal mines. It meets the on-site needs of coal mining, solves the problems of manual spraying of inhibitors and cost reduction, improves work efficiency, alleviates the pressure of manpower shortage, and can effectively reduce the phenomenon of spontaneous combustion in goaf areas.

[0068] A specific embodiment of the second aspect of this utility model provides a fully mechanized mining face. The fully mechanized mining face includes a spraying device 100 of any of the above embodiments, which is used to spray fire extinguishing solution into the collapsed area.

[0069] In this embodiment, the spraying device 100 can be used to extinguish fires in the goaf. Furthermore, since this embodiment includes the spraying device 100 from any of the above embodiments, it possesses at least the aforementioned advantages, which will not be elaborated further here.

[0070] like Figure 2 As shown, in some embodiments, the fully mechanized mining face also includes a hydraulic support 200; a spraying device 100 is installed on top of the shield beam of the hydraulic support 200. Installing the spraying device 100 on top of the shield beam of the hydraulic support 200 avoids the spraying device 100 occupying the limited space of the roadway, improving space utilization. At the same time, installing the spraying device 100 on top of the shield beam of the hydraulic support 200 can also work in conjunction with the hydraulic support 200 to achieve timely fire suppression in the goaf.

[0071] Specifically, when the hydraulic support 200 is being moved, the spraying device 100 can spray fire extinguishing solution into the goaf to prevent spontaneous combustion of the coal seam.

[0072] Specifically, the longwall mining face also includes multiple hydraulic supports 200 and multiple spraying devices 100; each spraying device 100 corresponds one-to-one with a hydraulic support 200. The multiple hydraulic supports 200 are arranged radially along the goaf, and the spraying devices 100 are installed on the top of the shield beams of the hydraulic supports 200. By activating the spraying devices 100 on the top of the shield beams of different hydraulic supports 200, fire suppression can be carried out at different locations in the goaf, improving the accuracy and efficiency of fire suppression.

[0073] In some embodiments, the hydraulic support 200 is connected to the drive assembly 130 of the spraying device 100 to drive the drive assembly 130 to move, so that the piston 120 reciprocates in a first direction. This allows the hydraulic support 200 and the spraying device 100 to operate synchronously. Specifically, the lifting and lowering movements of the hydraulic support 200 can both drive the crankshaft to rotate, completing the drainage process and achieving fire extinguishing in the goaf.

[0074] Furthermore, the fully mechanized mining face also includes a temperature measurement system and a control system; the temperature measurement system 300 is used to detect the temperature of the goaf; the control system is connected to the spraying device 100 and the temperature measurement system 300; the control system is used to control the start and stop of the spraying device 100 according to the temperature detected by the temperature measurement system 300.

[0075] In this embodiment, the temperature of the goaf can be determined by setting up a temperature measurement system 300, thereby determining whether there is a fire in the goaf based on the temperature. By setting up a control system connected to the temperature measurement system 300 and the spraying device 100, the spraying device 100 can be controlled according to the temperature of the goaf, so as to achieve the purpose of timely spraying fire extinguishing solution to the fire area and improve the timeliness of fire extinguishing.

[0076] Specifically, when the actual temperature collected by the temperature measurement system 300 is higher than the safe temperature threshold, the control system controls the spraying device 100 to start spraying fire extinguishing solution into the goaf area.

[0077] Furthermore, the temperature measurement system 300 includes multiple temperature-sensing optical cables; these cables are spaced apart along the axial direction of the goaf; one end of each cable is located on one side of the goaf, and the other end extends radially to the other side of the goaf. This design allows for monitoring of radial and axial temperature changes in the goaf.

[0078] Specifically, the control system is used to determine the target location where the actual temperature is higher than the safe temperature threshold based on temperature changes and the safe temperature threshold.

[0079] The control system also controls the corresponding spraying device 100 to be activated based on the target location, so as to spray the target location and achieve the purpose of timely fire extinguishing.

[0080] Specifically, multiple temperature-sensing optical cables are connected in parallel to form an L-shaped wiring pattern, which can realize comprehensive monitoring of the goaf area.

[0081] Furthermore, temperature-sensing optical cables belong to the existing technology and specifically include optical fibers and temperature sensors.

[0082] Furthermore, the control system includes distributed temperature monitoring stations; temperature-sensing optical cables are electrically connected to the distributed temperature monitoring stations underground, which demodulate the temperature signals, display the results, and store them. The distributed temperature monitoring stations transmit data in real time to the ground control room via Ethernet switches.

[0083] In summary, the fully mechanized mining face operation of this embodiment is simple. During the hydraulic support 200's support retraction process, the device automatically sprays fire extinguishing solution, resulting in low manual labor intensity, uniform spray concentration, and good effectiveness. The spraying speed is fast, operating alongside the support relocation process without affecting normal mining operations. By setting up a temperature monitoring system 300, the temperature within the goaf can be detected. Combined with the control system, the spraying device 100 can be controlled, enabling timely fire extinguishing at fire locations.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A spraying device, characterized in that, include: The first liquid storage tank (110) has a liquid storage chamber (111) inside, which is used to store fire extinguishing solution; the first liquid storage tank (110) has an inlet (112) and an outlet (113). A piston (120) is installed in the liquid storage chamber (111). The piston (120) is sealed to the liquid storage chamber (111) and slides in cooperation with the first liquid storage tank (110) in a first direction. A drive assembly (130) is connected to the piston (120); the drive assembly (130) drives the piston (120) to reciprocate along the first direction to adjust the volume of the liquid storage chamber (111), so that the fire extinguishing solution enters the liquid storage chamber (111) from the inlet (112) and the fire extinguishing solution is discharged from the liquid storage chamber (111) from the outlet (113).

2. The spraying device according to claim 1, characterized in that, The drive component (130) includes: The first connecting rod (131) has one end hinged to the piston (120); A crankshaft (132) is hinged to the other end of the first connecting rod (131), and the crankshaft (132) is used to drive the piston (120) to reciprocate along the first direction via the first connecting rod (131).

3. The spraying device according to claim 1, characterized in that, Also includes: The second storage tank is used to supply the fire extinguishing solution to the first storage tank (110); An inlet pipe (140) is installed at the inlet port (112), and an inlet valve (141) is installed on the inlet pipe (140). The inlet end of the inlet pipe (140) is connected to the second storage tank. A liquid outlet pipe (150) is installed at the liquid outlet (113), and a liquid outlet valve (151) is installed on the liquid outlet pipe (150).

4. The spraying device according to claim 3, characterized in that, Also includes: A spray assembly (160) is disposed at the outlet end of the outlet pipe (150); The spray assembly (160) is used to spray the extinguishing solution in the form of a water mist.

5. The spraying device according to claim 4, characterized in that, The spray assembly (160) includes a rotating nozzle.

6. The spraying device according to claim 3, characterized in that, Also includes: A flow control unit (170) is installed on the outlet pipe (150) to control the flow rate of the outlet pipe (150).

7. The spraying device according to claim 1, characterized in that, Also includes: A filter screen (180) is installed at the liquid outlet (113).

8. A fully mechanized mining face, characterized in that, The spraying device (100) according to any one of claims 1 to 7 is used to spray fire extinguishing solution into the goaf.

9. The fully mechanized mining face according to claim 8, characterized in that, Also includes: A hydraulic support (200) is provided, and the spraying device (100) is installed on the top of the shield beam of the hydraulic support (200).

10. The fully mechanized mining face according to claim 8, characterized in that, Also includes: Temperature measurement system (300) is used to detect the temperature of the goaf area; A control system is connected to the spraying device (100) and the temperature measuring system (300); the control system is used to control the start and stop of the spraying device (100) according to the temperature detected by the temperature measuring system (300).

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