Spraying device and automatic alarm fire extinguishing system for main shaft of coal mine

Abstract

The application discloses a spraying device and a coal mine main shaft automatic alarm fire extinguishing system. The spraying device comprises a nozzle body, the nozzle body is provided with a liquid inlet, a water spraying opening and a spraying opening, the size of the water spraying opening is smaller than that of the spraying opening, the nozzle body is provided with a liquid cooling channel and a fire fighting channel, the nozzle body is provided with a blocking piece, the spraying device has a normal mode and a fire fighting mode, in the normal mode, the blocking piece blocks the fire fighting channel, the liquid inlet is communicated with the water spraying opening through the liquid cooling channel, in the fire fighting mode, the blocking piece blocks the liquid cooling channel, and the liquid inlet is communicated with the spraying opening through the fire fighting channel. The spraying device has two operation modes, when the normal mode is operated, small-flow water is sprayed to meet the cooling demand, when the fire fighting mode is operated, large-flow water is sprayed to meet the fire extinguishing demand, thereby solving the problem that the water spraying device in the related art can only spray water for cooling but cannot extinguish fire, and the practicality of the spraying device is improved.

Description

Technical Field

[0001] This invention relates to the field of coal mine safety technology, and in particular to a sprinkler device and an automatic alarm and fire extinguishing system for the main shaft of a coal mine. Background Technology

[0002] Belt conveyors in the main shaft of coal mines are crucial equipment in coal mining, primarily used to transport coal from the underground mining face to the shaft entrance or directly to the coal washing plant. During prolonged operation, the belt conveyor generates heat due to friction between the belt and the drive, driven, and idler rollers. Improper equipment maintenance, such as insufficient lubrication, excessive load, or improper belt tension, can exacerbate wear, leading to increased temperature and even fire. Furthermore, if the conveyed material contains flammable substances such as grease, volatile liquids, or coal, leaks or contact with high-temperature components can also ignite a fire.

[0003] In related technologies, a water sprinkler system is installed above the belt conveyor to cool the conveyor inside the main shaft during operation, thereby reducing the temperature of the materials and the risk of fire caused by excessive temperature. However, personnel cannot inspect the belt conveyor during operation, and in the event of a fire or other abnormal situation, timely and effective firefighting cannot be achieved. Furthermore, the water sprinkler system has a relatively small flow rate, which is insufficient for effective fire suppression. Summary of the Invention

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

[0005] Therefore, embodiments of the present invention provide a spraying device that has the functions of water spraying for cooling and fire suppression.

[0006] The spray device of this invention includes a nozzle body, which has a liquid inlet, a water spray outlet and a spray nozzle. The size of the water spray outlet is smaller than the size of the spray nozzle. The nozzle body has a liquid cooling channel and a fire-fighting channel, and a sealing component is provided inside the nozzle body.

[0007] The sprinkler system has a normal mode and a fire-fighting mode. In the normal mode, the sealing element blocks the fire-fighting passage, and the liquid inlet is connected to the sprinkler outlet through the liquid-cooling passage. In the fire-fighting mode, the sealing element blocks the liquid-cooling passage, and the liquid inlet is connected to the sprinkler outlet through the fire-fighting passage.

[0008] The sprinkler device of this invention has two operating modes. In normal mode, it sprays a small flow of water to meet the cooling needs. In fire mode, it sprays a large flow of water to meet the fire extinguishing needs. This solves the problem in related technologies that sprinkler devices can only spray water to cool down but cannot extinguish fires, thus improving the practicality of the sprinkler device.

[0009] In some embodiments, the nozzle body includes an outer cylinder and an inner cylinder, the outer cylinder is sleeved on the inner cylinder and spaced apart from the inner cylinder in the inward and outward directions, the inner peripheral wall of the outer cylinder and the outer peripheral wall of the inner cylinder together define the liquid cooling channel, and the inner cavity of the inner cylinder is the fire-fighting channel.

[0010] In some embodiments, both the outer cylinder and the inner cylinder have a first end and a second end in their axial direction. The opening at the first end of the outer cylinder is the liquid inlet. The second end of the outer cylinder is flush with the second end of the inner cylinder. An annular sealing plate is provided between the second end of the outer cylinder and the second end of the inner cylinder. The annular sealing plate is provided with a plurality of water spray nozzles. The opening at the second end of the inner cylinder is the spray nozzle.

[0011] In some embodiments, the outer cylinder includes a first segment, a second segment, and a third segment connected in sequence. The cross-sectional area of ​​the first segment is smaller than that of the second segment, and the cross-sectional area of ​​the third segment gradually decreases along the direction from the first segment to the second segment. The outer peripheral wall of the first segment is provided with threads, and a portion of the second segment and the third segment are fitted onto the inner cylinder.

[0012] In some embodiments, the sealing element includes:

[0013] A fixing ring is located inside the inner cylinder, with its central axis coaxial with the central axis of the inner cylinder, and its outer peripheral wall connected to the inner peripheral wall of the inner cylinder.

[0014] A sphere is disposed inside the inner cylinder and is movable along the axial direction of the inner cylinder. The diameter of the sphere is larger than the inner diameter of the fixing ring, so that the sphere blocks the central through hole of the fixing ring.

[0015] A movable ring is located inside the second section of the outer cylinder. The central axis of the movable ring is coaxial with the central axis of the outer cylinder. The outer peripheral wall of the movable ring is connected to the inner peripheral wall of the second section of the outer cylinder. The movable ring is movable along the axial direction of the outer cylinder. The inner diameter of the movable ring is greater than or equal to the outer diameter of the inner cylinder, so that the movable ring blocks the channel between the second section of the outer cylinder and the inner cylinder.

[0016] In some embodiments, the sealing member further includes a support frame and a return spring. The support frame is disposed at the opening at the first end of the inner cylinder. The support frame is connected to the ball via the return spring. The central axis of the return spring is coaxial with the central axis of the inner cylinder.

[0017] In some embodiments, the sealing element further includes a connecting rod, through which the ball is connected to the movable ring, so that the ball and the movable ring move synchronously.

[0018] In some embodiments, the fixing ring is provided with a sliding hole, the extension direction of which is consistent with the axial direction of the inner cylinder, and the connecting rod slides through the sliding hole.

[0019] In some embodiments, there are multiple sliding holes and multiple connecting rods, with the multiple sliding holes distributed at intervals along the circumference of the fixing ring, and the multiple sliding holes and multiple connecting rods corresponding one-to-one.

[0020] An embodiment of the present invention also proposes an automatic alarm and fire extinguishing system for the main shaft of a coal mine.

[0021] The automatic alarm and fire extinguishing system for the main shaft of a coal mine according to an embodiment of the present invention includes:

[0022] A detection device is installed in a predetermined area inside the main shaft, and the detection device is used to detect environmental data inside the main shaft.

[0023] The spraying device described in any of the above embodiments is located above the belt conveyor inside the main shaft, and there are multiple spraying devices, which are distributed at intervals along the direction of the belt conveyor inside the main shaft.

[0024] A water supply device is connected to the spray device via a pipeline. The water supply device is used to deliver water at P0 pressure to the spray device via the pipeline. The spray device operates in the normal mode. Alternatively, the water supply device is used to deliver P0 water. ′ Pressurized water is delivered to the sprinkler system via pipeline, and the sprinkler system operates in the fire-fighting mode, with P0... ′ >P0;

[0025] A control device is connected to the detection device and the water conveying device, so that the control device controls the pressure of the water conveying device according to the detection data transmitted by the detection device.

[0026] The automatic alarm and fire extinguishing system for the main shaft of a coal mine according to this invention uses a detection device to monitor the environment inside the main shaft in real time. In the absence of a fire, the water supply device delivers water at normal pressure to the sprinkler device, which operates in normal mode to spray water on the belt conveyor and materials for cooling. When a fire occurs, the control device automatically increases the pressure of the water supply device to switch the sprinkler device to fire-fighting mode, spraying a large amount of water to extinguish the fire, thereby achieving automatic and effective fire extinguishing and reducing the harm of fire accidents. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the normal operating mode of the spray device according to an embodiment of the present invention.

[0028] Figure 2 This is a schematic diagram of the fire-fighting operation mode of the sprinkler device according to an embodiment of the present invention.

[0029] Figure 3 This is a first schematic diagram of an automatic alarm and fire extinguishing system for the main shaft of a coal mine, according to an embodiment of the present invention.

[0030] Figure 4 This is a second schematic diagram of an automatic alarm and fire extinguishing system for the main shaft of a coal mine, according to an embodiment of the present invention.

[0031] Figure label:

[0032] 100 - Main shaft, 200 - Belt conveyor

[0033] 1-Sprinkler device, 2-Detection device, 3-Water conveyance device

[0034] 11-Sprinkler body, 111-Outer cylinder, 1111-First section, 1112-Second section, 1113-Third section, 112-Inner cylinder, 101-Liquid inlet, 102-Sprinkler nozzle, 103-Sprinkler outlet, 104-Liquid cooling passage, 105-Fire escape passage.

[0035] 12-Sealing component, 121-Fixing ring, 122-Sphere, 123-Moving ring, 124-Support frame, 125-Reset spring, 126-Connecting rod. Detailed Implementation

[0036] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0037] The spraying device 1 of the present invention is described below with reference to the accompanying drawings.

[0038] like Figure 1 and Figure 2 As shown, the spray device 1 of this embodiment includes a nozzle body 11. The nozzle body 11 has a liquid inlet 101, a water spray nozzle 102 and a spray nozzle 103. The size of the water spray nozzle 102 is smaller than the size of the spray nozzle 103. The nozzle body 11 has a liquid cooling channel 104 and a fire-fighting channel 105. A sealing component 12 is provided inside the nozzle body 11.

[0039] The sprinkler device 1 of this invention has a normal mode and a fire-fighting mode. For example... Figure 1As shown, when the sprinkler system 1 is operating in normal mode, the sealing component 12 blocks the fire escape 105, and the liquid inlet 101 is connected to the sprinkler nozzle 102 through the liquid cooling channel 104. Figure 2 As shown, when the sprinkler device 1 is in fire-fighting mode, the sealing component 12 blocks the liquid cooling channel 104, and the liquid inlet 101 is connected to the sprinkler outlet 103 through the fire channel 105.

[0040] Therefore, the sprinkler device 1 of this embodiment has two operating modes. When no fire occurs, the sprinkler device 1 operates in normal mode, spraying a small flow of water to meet the cooling needs of the belt conveyor 200 and the materials. When a fire occurs, the sprinkler device 1 operates in fire-fighting mode, spraying a large flow of water to meet the fire-fighting needs, thereby solving the problem in related technologies that sprinkler devices can only spray water for cooling but cannot extinguish fires, and improving the practicality of the sprinkler device 1.

[0041] Optionally, such as Figure 1 and Figure 2 As shown, the nozzle body 11 includes an outer cylinder 111 and an inner cylinder 112. The outer cylinder 111 is sleeved on the inner cylinder 112 and spaced apart from the inner cylinder 112 in the inward and outward directions. The inner peripheral wall of the outer cylinder 111 and the outer peripheral wall of the inner cylinder 112 together define a liquid cooling channel 104. The inner cavity of the inner cylinder 112 is a fire-fighting channel 105.

[0042] Both the outer cylinder 111 and the inner cylinder 112 have a first end and a second end in their axial direction, for example, as Figure 1 or Figure 2 As shown, the first end of the outer cylinder 111 is the upper end, and the second end of the outer cylinder 111 is the lower end. Similarly, the first end of the inner cylinder 112 is the upper end, and the second end of the inner cylinder 112 is the lower end. The opening at the upper end of the outer cylinder 111 is the liquid inlet 101, and the lower ends of the outer cylinder 111 and the inner cylinder 112 are flush. An annular sealing plate is provided between the lower ends of the outer cylinder 111 and the lower ends of the inner cylinder 112, and multiple water spray nozzles 102 are provided on the annular sealing plate. The opening at the lower end of the inner cylinder 112 is the spray nozzle 103.

[0043] It is understandable that water enters the outer cylinder 111 from the liquid inlet 101. When the sealing component 12 blocks the liquid cooling channel 104, the water flows into the fire passage 105 and flows out through the spray nozzle 103. When the sealing component 12 blocks the fire passage 105, the water flows into the liquid cooling channel 104 and flows out through multiple sprinkler nozzles 102.

[0044] In some embodiments, such as Figure 1 and Figure 2 As shown, the outer cylinder 111 includes a first section 1111, a second section 1112, and a third section 1113 connected in sequence.

[0045] The cross-sectional area of ​​the first segment 1111 is smaller than that of the second segment 1112, and the cross-sectional area of ​​the third segment 1113 gradually decreases from top to bottom. The outer peripheral wall of the first segment 1111 is provided with threads (not shown in the figure), and part of the second segment 1112 and the third segment 1113 are fitted onto the inner cylinder 112.

[0046] Understandably, the first section 1111 of the outer cylinder 111 is threaded so that the spray device 1 can be connected to the water supply pipeline via a flange, making it easy to disassemble and assemble.

[0047] When water enters the spray device 1, it first flows into the part of the second section 1112 of the outer cylinder 111 that is not fitted with the inner cylinder 112 for buffering, and then flows into the corresponding channel according to the sealing condition of the sealing member 12, so as to ensure that the sprayed water has a stable pressure and optimize the spraying effect.

[0048] Furthermore, since the size of the spray nozzle 102 is relatively small, the liquid cooling channel 104 is designed as a tapered structure to reduce pressure loss and improve the spraying effect.

[0049] In some embodiments, such as Figure 1 and Figure 2 As shown, the sealing component 12 includes a fixed ring 121, a ball 122, and a movable ring 123.

[0050] The fixing ring 121 is located inside the inner cylinder 112, and its central axis is coaxial with that of the inner cylinder 112. The outer peripheral wall of the fixing ring 121 is connected to the inner peripheral wall of the inner cylinder 112. The sphere 122 is located inside the inner cylinder 112 and is movable along the axial direction of the inner cylinder 112. The diameter of the sphere 122 is larger than the inner diameter of the fixing ring 121 so that the sphere 122 blocks the central through hole of the fixing ring 121.

[0051] The movable ring 123 is located inside the second section 1112 of the outer cylinder 111. The central axis of the movable ring 123 is coaxial with the central axis of the outer cylinder 111. The outer peripheral wall of the movable ring 123 is connected to the inner peripheral wall of the second section 1112 of the outer cylinder 111. The movable ring 123 is movable along the axial direction of the outer cylinder 111. The inner diameter of the movable ring 123 is greater than or equal to the outer diameter of the inner cylinder 112, so that the movable ring 123 blocks the channel between the second section 1112 of the outer cylinder 111 and the inner cylinder 112.

[0052] Understandably, when the sprinkler system 1 is operating in normal mode, the ball 122 blocks the central through hole of the fixing ring 121 to block the fire passage 105. At this time, the moving ring 123 is in an unsealed state, allowing the liquid inlet 101 to connect with the sprinkler nozzle 102 through the liquid cooling passage 104. When the sprinkler system 1 is operating in fire-fighting mode, the moving ring 123 blocks the passage between the second section 1112 of the outer cylinder 111 and the inner cylinder 112 to block the liquid cooling passage 104. At this time, the ball 122 is in an unsealed state, allowing the liquid inlet 101 to connect with the sprinkler nozzle 103 through the fire passage 105.

[0053] Optionally, such as Figure 1 and Figure 2 As shown, the sealing component 12 also includes a support frame 124 and a return spring 125. The support frame 124 is located at the opening at the upper end of the inner cylinder 112. The support frame 124 includes a central plate and multiple support rods. The central plate is located at the center of the opening at the upper end of the inner cylinder 112 and is connected to the inner peripheral wall of the inner cylinder 112 through the multiple support rods to ensure the connectivity of the opening at the upper end of the inner cylinder 112. The support frame 124 is connected to the ball 122 via the return spring 125. The central axis of the return spring 125 is coaxial with the central axis of the inner cylinder 112.

[0054] Therefore, when the water pressure delivered to the sprinkler device 1 is low, it cannot overcome the tension of the return spring 125 on the ball 122, and the ball 122 blocks the central through hole of the fixing ring 121, and the sprinkler device 1 operates in normal mode. When the water pressure delivered to the sprinkler device 1 is high, it can overcome the tension of the return spring 125 on the ball 122, thereby releasing the blockage of the central through hole of the fixing ring 121 by the ball 122, and the sprinkler device 1 operates in fire-fighting mode.

[0055] Furthermore, such as Figure 1 and Figure 2 As shown, the sealing component 12 also includes a connecting rod 126, and the ball 122 is connected to the moving ring 123 through the connecting rod 126 so that the ball 122 and the moving ring 123 move synchronously.

[0056] That is, the sphere 122 and the moving ring 123 are linked to ensure that when the sphere 122 blocks the fire passage 105, the moving ring 123 opens the liquid cooling passage 104, and when the sphere 122 opens the fire passage 105, the moving ring 123 blocks the liquid cooling passage 104, thereby improving the effectiveness of the mode switching of the sprinkler device 1.

[0057] In some embodiments, such as Figure 1 and Figure 2 As shown, the fixed ring 121 is provided with a sliding hole, the extension direction of which is consistent with the axial direction of the inner cylinder 112, and the connecting rod 126 slides through the sliding hole.

[0058] Understandably, the sliding fit between the connecting rod 126 and the sliding hole improves the stability of the movement of the ball 122 and the moving ring 123, reducing the risk of deviation affecting the operation of the spray device 1.

[0059] And, as Figure 1 and Figure 2 As shown, there are multiple sliding holes and multiple connecting rods 126. The multiple sliding holes are distributed at intervals along the circumference of the fixing ring 121. The multiple sliding holes and multiple connecting rods 126 correspond one-to-one, which further improves the reliability of the operation of the spray device 1.

[0060] The automatic alarm and fire extinguishing system for the main shaft of a coal mine according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0061] like Figure 3 and Figure 4 As shown, the automatic alarm and fire extinguishing system for the main shaft of a coal mine according to an embodiment of the present invention includes: a detection device 2, a water supply device 3, a control device (not shown in the figure), and a sprinkler device 1 as described in any of the above embodiments.

[0062] The detection device 2 is installed in a predetermined area within the main shaft 100 and is used to detect environmental data within the main shaft 100. For example, temperature sensors are arranged around the equipment to monitor temperature anomalies; smoke detectors are installed in areas with good air circulation to detect changes in smoke concentration; flame detectors are installed in areas with good visibility to detect open flames in a timely manner; and gas detection sensors are used to detect specific early fire indicator gases, such as carbon monoxide and carbon dioxide.

[0063] The spraying device 1 is located above the belt conveyor 200 inside the main shaft 100, and there are multiple spraying devices 1, which are distributed at intervals along the direction of the belt conveyor 200 inside the main shaft 100.

[0064] Water supply device 3 is connected to spray device 1 via pipeline. When water supply device 3 delivers water at pressure P0 to spray device 1, spray device 1 operates in normal mode. ′ Pressurized water is supplied to sprinkler system 1, and sprinkler system 1 operates in fire-fighting mode. Furthermore, P0... ′ >P0.

[0065] The control device is a control system consisting of an industrial computer, a display, and operating equipment. The control device is connected to the detection device 2 and the water conveying device 3 so that the control device controls the pressure of the water conveying device 3 to deliver water based on the detection data transmitted by the detection device 2.

[0066] Therefore, in the automatic alarm and fire extinguishing system of the main shaft of the coal mine according to the present invention, the detection device 2 monitors the environment inside the main shaft 100 of the coal mine in real time. When no fire occurs, the water supply device 3 delivers water at normal pressure to the sprinkler device 1. The sprinkler device 1 operates in normal mode, spraying water to cool the belt conveyor 200 and the materials. When a fire occurs, the control device automatically controls to increase the pressure of the water supplied by the water supply device 3, so that the sprinkler device 1 switches to fire-fighting mode and sprays a large amount of water to extinguish the fire, thereby achieving automatic and effective fire extinguishing and reducing the harm of fire accidents.

[0067] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0068] Furthermore, 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0069] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," 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, an electrical connection, or a connection that allows communication between them; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0070] In this invention, 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," "over," and "on top" of 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.

[0071] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the 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.

[0072] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A spraying device, characterized in that, Includes a nozzle body, the nozzle body having a liquid inlet, a water spray nozzle and a spray nozzle, the size of the water spray nozzle being smaller than the size of the spray nozzle, the nozzle body having a liquid cooling channel and a fire-fighting channel, and the nozzle body having a sealing component; The sprinkler system has a normal mode and a fire-fighting mode. In the normal mode, the sealing element blocks the fire-fighting passage, and the liquid inlet is connected to the sprinkler outlet through the liquid-cooling passage. In the fire-fighting mode, the sealing element blocks the liquid-cooling passage, and the liquid inlet is connected to the sprinkler outlet through the fire-fighting passage. The nozzle body includes an outer cylinder and an inner cylinder. The outer cylinder is fitted onto the inner cylinder and spaced apart from the inner cylinder in the inward and outward directions. The inner peripheral wall of the outer cylinder and the outer peripheral wall of the inner cylinder together define the liquid cooling channel. The inner cavity of the inner cylinder is the fire-fighting channel. Both the outer cylinder and the inner cylinder have a first end and a second end in their axial direction. The opening of the first end of the outer cylinder is the liquid inlet. The second end of the outer cylinder is flush with the second end of the inner cylinder. An annular sealing plate is provided between the second end of the outer cylinder and the second end of the inner cylinder. The annular sealing plate is provided with multiple spray nozzles. The opening of the second end of the inner cylinder is the spray nozzle. The outer cylinder includes a first section, a second section, and a third section connected in sequence. The cross-sectional area of ​​the first section is smaller than that of the second section. The cross-sectional area of ​​the third section gradually decreases along the direction from the first section to the second section. The outer peripheral wall of the first section is provided with threads. A portion of the second section and the third section are fitted onto the inner cylinder. The sealing component includes: A fixing ring is located inside the inner cylinder, with its central axis coaxial with the central axis of the inner cylinder, and its outer peripheral wall connected to the inner peripheral wall of the inner cylinder. A sphere is disposed inside the inner cylinder and is movable along the axial direction of the inner cylinder. The diameter of the sphere is larger than the inner diameter of the fixing ring, so that the sphere blocks the central through hole of the fixing ring. A movable ring is located inside the second section of the outer cylinder. The central axis of the movable ring is coaxial with the central axis of the outer cylinder. The outer peripheral wall of the movable ring is connected to the inner peripheral wall of the second section of the outer cylinder. The movable ring is movable along the axial direction of the outer cylinder. The inner diameter of the movable ring is greater than or equal to the outer diameter of the inner cylinder, so that the movable ring blocks the channel between the second section of the outer cylinder and the inner cylinder. A support frame and a return spring are provided. The support frame is located at the opening at the first end of the inner cylinder. The support frame is connected to the ball via the return spring. The central axis of the return spring is coaxial with the central axis of the inner cylinder. A connecting rod is provided, through which the ball is connected to the moving ring, so that the ball and the moving ring move synchronously.

2. The spraying device according to claim 1, characterized in that, The fixing ring is provided with a sliding hole, the extension direction of which is consistent with the axial direction of the inner cylinder, and the connecting rod slides through the sliding hole.

3. The spraying device according to claim 2, characterized in that, Both the sliding holes and the connecting rods are multiple, and the multiple sliding holes are distributed at intervals along the circumference of the fixed ring, with each of the multiple sliding holes and the multiple connecting rods corresponding to one another.

4. An automatic alarm and fire extinguishing system for the main shaft of a coal mine, characterized in that, include: A detection device is installed in a predetermined area inside the main shaft, and the detection device is used to detect environmental data inside the main shaft. According to any one of claims 1-3, the spraying device is located above the belt conveyor inside the main shaft, and there are multiple spraying devices, which are distributed at intervals along the direction of the belt conveyor inside the main shaft. A water conveying device is connected to the spraying device via a pipeline, and the water conveying device is used to deliver water to the spraying device. Pressurized water is delivered to the spray system via pipeline, and the spray system operates in the normal mode; alternatively, the water delivery device is used to... Pressurized water is delivered to the sprinkler system via pipeline, and the sprinkler system operates in the fire-fighting mode. ; A control device is connected to the detection device and the water conveying device, so that the control device controls the pressure of the water conveying device according to the detection data transmitted by the detection device.

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