Spraying device and fully mechanized coal mining face

Abstract

The invention 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] The invention relates to the technical field of coal mining equipment, and in particular to a spraying device and a fully mechanized mining working face. Background Art

[0002] Coal mine goaf refers to the void or cavity left after underground coal or coal gangue is 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 on the working face. Some airflow entering the goaf may cause spontaneous combustion of the remaining coal, thus affecting the normal production of the working face.

[0003] At present, the goaf of coal mines generally adopts the method of artificial spraying of inhibitors to prevent and extinguish fires in the goaf. The traditional spraying of inhibitors for fire prevention and extinguishing has the following disadvantages: (1) the efficiency of artificial spraying of inhibitors is low, the operation progress is slow, and the concentration of inhibitors is uneven; (2) the structure is complex, the pipelines are numerous, the daily management and maintenance workload is large, and the labor intensity of workers is high; (3) a large amount of inhibitor is easily missed above the support pedal, resulting in the inhibitor being unable to actually enter the goaf and play a role in fire prevention and extinguishing. Summary of the invention

[0004] The present invention provides a spraying device and a fully mechanized mining working face, which are used to solve at least one of the defects existing in the prior art.

[0005] The present invention provides a spraying device, comprising: A first liquid storage tank having a liquid storage cavity therein, the liquid storage cavity being used to store the fire extinguishing solution; the first liquid storage tank having a liquid inlet and a liquid outlet; A piston is installed in the liquid storage cavity, the piston is sealed and assembled with the liquid storage cavity, and is slidably matched with the first liquid storage tank along a first direction; A driving assembly is connected to the piston; the driving assembly drives the piston to reciprocate along the first direction to adjust the volume of the liquid storage chamber, so that the fire extinguishing solution enters the liquid storage chamber from the liquid inlet and discharges the fire extinguishing solution from the liquid outlet.

[0006] According to the spraying device provided by the present invention, the driving assembly comprises: a first connecting rod, one end of which is hinged to the piston; A crankshaft is hinged to the other end of the first connecting rod, and the crankshaft is used to drive the piston to reciprocate along the first direction through the first connecting rod.

[0007] The spraying device provided according to the present invention also includes: a second liquid storage tank, used to provide the fire extinguishing solution to the first liquid storage tank; A liquid inlet pipe is installed at the liquid inlet port, a liquid inlet valve is installed on the liquid inlet pipe, and a liquid inlet end of the liquid inlet pipe is connected to the second liquid storage tank; A liquid outlet pipe is installed at the liquid outlet, and a liquid outlet valve is installed on the liquid outlet pipe.

[0008] The spraying device provided according to the present invention also includes: A spray assembly is arranged at the liquid outlet end of the liquid outlet pipe; the spray assembly is used to spray the fire extinguishing solution in the form of water mist.

[0009] According to the spraying device provided by the present invention, the spraying assembly includes a rotating spray head.

[0010] The spraying device provided according to the present invention also includes: A flow control unit is installed in the liquid outlet pipe and is used to control the flow of the liquid outlet pipe.

[0011] The spraying device provided according to the present invention also includes: A filter screen is installed at the liquid outlet.

[0012] A second aspect of the present invention provides a fully mechanized mining working face, comprising a spraying device as described in any one of the above items, wherein the spraying device is used to spray a fire extinguishing solution into a goaf.

[0013] The fully mechanized mining working face provided by the present invention also includes: Hydraulic support, the spraying device is installed on the top of the shielding beam of the hydraulic support.

[0014] The fully mechanized mining working face provided by the present invention also includes: A temperature measurement system, used to detect temperature changes in the goaf; 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.

[0015] The spraying device provided by the present invention is provided with a piston and a driving assembly, and the driving assembly can drive the piston to reciprocate along a first direction to adjust the volume of the liquid storage chamber. Specifically: when the driving assembly drives the piston to move forward along the first direction, the volume of the liquid storage chamber increases, so that the fire extinguishing solution can enter the liquid storage chamber from the liquid inlet; when the driving assembly drives the piston to move backward along the first direction, the volume of the liquid storage chamber decreases, so that the fire extinguishing solution outlet can be discharged from the liquid storage chamber. In this way, manpower can be saved and the spraying efficiency and operation speed can be improved.

[0016] The fully mechanized mining working face provided by the present invention can spray a fire extinguishing solution into the goaf by arranging a spraying device to prevent the coal seam from spontaneously combusting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of the spraying device provided by the present invention.

[0019] Figure 2 It is a schematic diagram of the arrangement of the spraying device provided by the present invention in the fully mechanized mining working face.

[0020] Figure 3 It is a partial structural schematic diagram of the spraying device provided by the present invention.

[0021] Reference numerals: 100, spraying device; 110, first liquid storage tank; 111, liquid storage chamber; 112, liquid inlet; 113, liquid outlet; 120, piston; 130, driving 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, spray assembly; 170, flow control unit; 180, filter screen; 190, carrier trolley; 191, frame; 192, wheel; 200. Hydraulic support. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0025] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0026] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0027] Combine the following Figures 1 to 3 The structure and working principle of the spraying device of the present invention are described in detail. Figure 1 It is a structural schematic diagram of the spraying device provided by the present invention. Figure 2 It is a schematic diagram of the arrangement of the spraying device provided by the present invention in the fully mechanized mining working face. Figure 3 It is a partial structural schematic diagram of the spraying device provided by the present invention.

[0028] like Figure 1As shown, a specific embodiment of the first aspect of the present invention provides a spraying device 100. The spraying device 100 includes a first liquid storage tank 110, a piston 120 and a driving assembly 130. The first liquid storage tank 110 has a liquid storage chamber 111 inside, and the liquid storage chamber 111 is used to store a fire extinguishing solution; the first liquid storage tank 110 has a liquid inlet 112 and a liquid outlet 113. The piston 120 is installed in the liquid storage chamber 111, and the piston 120 is sealed and assembled with the liquid storage chamber 111, and is slidably matched with the first liquid storage tank 110 along a first direction. The driving assembly 130 is connected to the piston 120; the driving 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 liquid inlet 112, and the fire extinguishing solution is discharged from the liquid storage chamber 111 from the liquid outlet 113.

[0029] In this embodiment, by providing the piston 120 and the driving assembly 130, the driving assembly 130 can drive the piston 120 to reciprocate along the first direction to adjust the volume of the liquid storage chamber 111. Specifically, when the driving assembly 130 drives the piston 120 to move forward along the first direction, the volume of the liquid storage chamber 111 increases, so that the fire extinguishing solution can enter the liquid storage chamber 111 from the liquid inlet 112; when the driving assembly 130 drives the piston 120 to move backward along the first direction, the volume of the liquid storage chamber 111 decreases, so that the fire extinguishing solution outlet 113 can discharge the liquid storage chamber 111. This can save manpower and improve spraying efficiency and operation speed.

[0030] Further, the liquid inlet 112 of the first liquid storage tank 110 is arranged crosswise with the liquid outlet 113 of the first liquid storage tank 110. Specifically, the central axis of the liquid inlet 112 intersects with the central axis of the liquid outlet 113. Preferably, the central axis of the liquid inlet 112 is perpendicular to the central axis of the liquid outlet 113. Allowing the fire extinguishing solution to enter the liquid storage chamber 111 vertically can increase the disturbance of the fire extinguishing solution in the liquid storage chamber 111 and improve the mixing uniformity of the fire extinguishing solution.

[0031] In some embodiments, the spraying device 100 further includes a stirring structure, which is disposed in the liquid storage chamber 111 and is used to stir the fire extinguishing solution in the liquid storage chamber 111 to improve uniformity.

[0032] It can be understood that the stirring structure is disposed at a position of the liquid storage chamber 111 close to the liquid outlet 113 .

[0033] It can be understood that the inner wall of the liquid storage chamber 111 is provided with a limit protrusion to limit the extreme position of the piston 120 moving to the right to prevent the piston 120 from interfering with the stirring structure.

[0034] Furthermore, the stirring structure includes a driving member and a stirring shaft; the driving member is installed on the outside of the first liquid storage tank 110, 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 driving member, and the upper end is located in the liquid storage chamber 111; the driving member drives the stirring shaft to rotate. It can be understood that the stirring shaft is sealed with the mounting hole and can rotate in the mounting hole. The driving member drives the stirring shaft to rotate to achieve stirring of the fire extinguishing solution in the liquid storage chamber 111.

[0035] In some embodiments, the driving assembly 130 may be an electric push rod, the driving end of which is connected to the piston 120, and the telescopic movement of the electric push rod may drive the piston 120 to reciprocate along the first direction, and the telescopic direction of the electric push rod is parallel to the first direction.

[0036] In some embodiments, the driving assembly 130 may be a linear motor that drives the piston 120 to reciprocate along the first direction.

[0037] In some embodiments, the driving 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 the first direction through 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 the rotational motion into the linear motion of the piston 120 along the first direction, thereby reducing the volume of the spraying device 100 in the first direction, which is conducive to the miniaturized design of the spraying device 100.

[0038] In some embodiments, the spraying device 100 includes a second liquid storage tank, a liquid inlet pipe 140 and a liquid outlet pipe 150; the second liquid storage tank is used to provide a fire extinguishing solution to the first liquid storage tank 110. The liquid inlet pipe 140 is installed at the liquid inlet port 112, and a liquid inlet valve 141 is installed on the liquid inlet pipe 140, and the liquid inlet end of the liquid inlet pipe 140 is connected to the second liquid storage tank. The liquid outlet pipe 150 is installed at the liquid outlet port 113, and a liquid outlet valve 151 is installed on the liquid outlet pipe 150. By providing the liquid inlet pipe 140, a mounting base can be provided for the liquid inlet valve 141, and it can also be used to connect the first liquid storage tank 110 with the second liquid storage tank, so as to provide a fire extinguishing solution for the first liquid storage tank 110. By providing the liquid outlet pipe 150, the liquid outlet port 113 of the first liquid storage tank 110 can be moved to any desired position according to actual conditions, thereby increasing the fire extinguishing range.

[0039] Specifically, when the crankshaft 132 makes a return motion, the first connecting rod 131 moves leftward along the first direction, the volume of the liquid storage chamber 111 gradually increases, the internal pressure gradually decreases, a partial vacuum state is formed inside the liquid storage chamber 111, the liquid outlet valve 151 is in a closed state, the liquid inlet valve 141 is opened, and 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 liquid inlet pipe 140. When the first connecting rod 131 moves leftward to the limit position, the fire extinguishing solution in the second liquid storage tank stops entering the liquid storage chamber 111.

[0040] When the crankshaft 132 performs the process motion, the first connecting rod 131 moves rightward along the first direction, 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, the pressure increases, the liquid outlet valve 151 opens, and the fire extinguishing solution is discharged through the liquid outlet pipe 150. When the process limit position is reached, the volume in the liquid storage chamber 111 reaches the minimum, and the discharge process ends.

[0041] Furthermore, a mounting bracket 152 is provided on the liquid outlet pipe 150 ; the mounting bracket 152 is used to be mounted on the hydraulic support 200 , thereby improving the installation stability of the liquid outlet pipe 150 .

[0042] like Figure 1 and Figure 3 As shown, in some embodiments, the spray device 100 includes a spray assembly 160; the spray assembly 160 is arranged at the liquid outlet end of the liquid outlet pipe 150; the spray assembly 160 is used to spray a water mist fire extinguishing solution. The water mist fire extinguishing solution can be discharged by setting the spray assembly 160. At this time, the water mist fire extinguishing solution can drift to any air leakage place in the goaf with the wind flow as a carrier, so as to achieve the purpose of extinguishing the goaf in all directions and improve the safe and efficient production of the mine.

[0043] Furthermore, the spray assembly 160 includes a rotating spray head. By providing the rotating spray head, the spray direction can be changed.

[0044] Specifically, since the crankshaft 132 is constantly moving back and forth, the liquid inlet and outlet processes are continuously carried out. Under the action of a certain internal and external pressure difference, the fire extinguishing solution can be atomized through the spray assembly 160, and drift to any air leakage in the goaf with the wind flow of the working face as a carrier, thereby achieving the purpose of all-round extinguishing in the goaf and improving the safe and efficient production of the mine.

[0045] like Figure 3 As shown, in some embodiments, the spray device 100 further includes a flow control unit 170; the flow control unit 170 is installed on the liquid outlet pipe 150 and is used to control the flow of the liquid outlet pipe 150. By setting the flow control unit 170, the discharge amount of the fire extinguishing solution can be adjusted according to actual conditions.

[0046] Furthermore, the flow control unit 170 includes an electro-hydraulic switch, which can more accurately control the flow of the fire extinguishing solution; when there is no fire extinguishing solution in the second liquid storage tank, the electro-hydraulic switch can be turned off to prevent the crankshaft from idling.

[0047] In some embodiments, the spray device 100 further includes a filter 180; the filter 180 is installed at the liquid outlet 113. The filter 180 can prevent impurities from entering the liquid outlet pipe 150.

[0048] In some embodiments, the spraying device 100 further includes a transporting trolley 190 ; the first liquid storage tank 110 is placed on the transporting trolley 190 , and the transporting trolley 190 can make moving the first liquid storage tank 110 more labor-saving.

[0049] Furthermore, the transport vehicle 190 includes a frame 191 and wheels 192 ; the first liquid storage tank 110 is placed on the frame 191 ; and the wheels 192 are installed on the lower end of the frame 191 .

[0050] It should be noted that the fire extinguishing solution contains an inhibitor. The inhibitor can prevent the coal seam from spontaneously igniting. The inhibitor is an existing product and can be purchased, so it will not be introduced in detail here.

[0051] To sum up, the spraying device 100 of this embodiment is small in size, light in weight, easy to transport, and fully functional, and can be used in 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, reduces costs, improves work efficiency, alleviates the pressure of manual tension, and can effectively reduce the phenomenon of spontaneous combustion in goafs.

[0052] A specific embodiment of the second aspect of the present invention provides a fully mechanized mining working face, which comprises a spraying device 100 according to any of the above embodiments, and the spraying device 100 is used to spray a fire extinguishing solution to a gap area.

[0053] In this embodiment, the fire in the goaf can be extinguished by providing the spraying device 100. In addition, because this embodiment includes the spraying device 100 of any of the above embodiments, it has at least the above advantages, which will not be described in detail.

[0054] like Figure 2 As shown, in some embodiments, the fully mechanized mining face further includes a hydraulic support 200; the spraying device 100 is installed on the top of the shielding beam of the hydraulic support 200. Installing the spraying device 100 on the top of the shielding beam of the hydraulic support 200 can prevent the spraying device 100 from occupying the limited space of the tunnel, thereby improving the space utilization rate. At the same time, installing the spraying device 100 on the top of the shielding beam of the hydraulic support 200 can also cooperate with the hydraulic support 200 to achieve timely fire extinguishing of the goaf.

[0055] Specifically, when the hydraulic support 200 is moved, the spraying device 100 can spray the fire extinguishing solution into the goaf to prevent the coal seam from spontaneously igniting.

[0056] Specifically, the fully mechanized mining face further includes a plurality of hydraulic supports 200 and a plurality of spraying devices 100; the plurality of spraying devices 100 correspond one to one to the plurality of hydraulic supports 200. The plurality of hydraulic supports 200 are arranged radially along the goaf, and the spraying devices 100 are installed on the top of the shielding beams of the hydraulic supports 200. By activating the spraying devices 100 on the top of the shielding beams of different hydraulic supports 200, fires can be extinguished at different positions of the goaf, thereby improving the accuracy and efficiency of fire extinguishing.

[0057] In some embodiments, the hydraulic support 200 is connected to the driving assembly 130 of the spraying device 100, and is used to drive the driving assembly 130 to move, so that the piston 120 reciprocates along the first direction. The hydraulic support 200 and the spraying device 100 can be synchronized. Specifically, the lifting and lowering movements of the hydraulic support 200 can drive the crankshaft to rotate, complete the drainage process, and achieve fire extinguishing in the goaf.

[0058] Furthermore, the comprehensive mining working face also includes a temperature measuring system and a control system; the temperature measuring system 300 is used to detect the temperature of the goaf; the 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.

[0059] In this embodiment, the temperature of the goaf can be determined by setting the temperature measuring system 300, so as to determine whether there is a fire in the goaf according to the temperature. By setting a control system connected to the temperature measuring 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 spraying the fire extinguishing solution to the fire area in time, thereby improving the timeliness of fire extinguishing.

[0060] Specifically, when the actual temperature collected by the temperature measurement system 300 is higher than the safety temperature threshold, the control system controls the spraying device 100 to start so as to spray the fire extinguishing solution into the goaf.

[0061] Furthermore, the temperature measurement system 300 includes a plurality of temperature sensing optical cables; the plurality of temperature sensing optical cables are arranged at intervals along the axial direction of the goaf; one end of the temperature sensing optical cable is located on one side of the goaf, and the other end of the temperature sensing optical cable extends along the radial direction of the goaf to the other side of the goaf. With such a design, the temperature change of the goaf in the radial direction and the temperature change in the axial direction can be monitored.

[0062] Specifically, the control system is used to determine a target position where the actual temperature is higher than the safety temperature threshold according to the temperature change and the safety temperature threshold; The control system also controls the spraying device 100 at the corresponding position to start according to the target position, so as to spray the target position and achieve the purpose of timely fire extinguishing.

[0063] Specifically, multiple temperature-sensing optical cables are connected in parallel to form an L-shaped wiring method, which can achieve all-round monitoring of the goaf area.

[0064] Furthermore, the temperature-sensitive optical cable belongs to the prior art, and specifically includes an optical fiber and a temperature sensor.

[0065] Furthermore, the control system includes a distributed temperature measurement substation; the temperature sensing optical cable is electrically connected to the distributed temperature measurement substation underground, and the distributed temperature measurement substation realizes the demodulation of temperature signals, the display and storage of results. The distributed temperature measurement substation transmits the data to the ground dispatching room in real time through an Ethernet switch.

[0066] In summary, the operation of the fully mechanized mining face of this embodiment is simple. During the hydraulic support 200 pulling process, the device automatically sprays the fire extinguishing solution, the labor intensity is low, the spraying concentration is uniform, and the effect is good; the spraying speed is fast, and the operation follows the support moving process, which does not affect the normal mining operation of the working face. By setting up the temperature measurement system 300, the temperature in the goaf can be detected. In combination with the control system, the spraying device 100 can be controlled to achieve timely fire extinguishing at the fire location.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A spraying device, characterized in that: include: A first liquid storage tank (110), having a liquid storage cavity (111) therein, wherein the liquid storage cavity (111) is used to store a fire extinguishing solution; the first liquid storage tank (110) has a liquid inlet (112) and a liquid outlet (113); A piston (120) is installed in the liquid storage chamber (111); the piston (120) is sealed and assembled with the liquid storage chamber (111), and is slidably matched with the first liquid storage tank (110) along 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 liquid inlet (112), and the fire extinguishing solution is discharged from the liquid storage chamber (111) from the liquid outlet (113).

2. The spraying device according to claim 1, characterized in that The driving assembly (130) comprises: a first connecting rod (131), one end of the first connecting rod (131) being hinged to the piston (120); A crankshaft (132), the crankshaft (132) being hinged to the other end of the first connecting rod (131), the crankshaft (132) being 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: a second liquid storage tank, used for providing the fire extinguishing solution to the first liquid storage tank (110); a liquid inlet pipe (140) installed at the liquid inlet port (112), a liquid inlet valve (141) installed on the liquid inlet pipe (140), and a liquid inlet end of the liquid inlet pipe (140) being in communication with the second liquid 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 arranged at the liquid outlet end of the liquid outlet pipe (150); The spray assembly (160) is used to spray the fire extinguishing solution in the form of water mist.

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

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

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

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

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

10. The fully mechanized mining face according to claim 8, characterized in that: Also includes: A temperature measurement system (300), used to detect the temperature of the goaf; 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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