A full-automatic spraying system for coal mine based on PLC control

Abstract

The utility model mentions a kind of full-automatic spraying system for coal mine based on PLC control, including PLC control cabinet, man-machine interactive interface, sensing unit, execution unit and waterway supply unit, PLC control cabinet inside is provided with PLC module, input output module, network communication module and control module, man-machine interactive interface includes industrial touch screen and the control software platform connected with host computer, industrial touch screen is electrically connected by connector with PLC module, sensing unit includes dust sensor, infrared sensor and liquid level sensor, execution unit includes atomizing nozzle, guide fan, frequency conversion water pump and solenoid valve, waterway supply unit includes water tank, water supply tap and anti-backflow hose, the water outlet end of water tank is connected with solenoid valve, frequency conversion water pump and atomizing nozzle in proper order, water tank is connected with water supply tap by anti-backflow hose, in general the utility model has the advantages of high degree of automation, high monitoring precision, high spraying efficiency, strong safety protection performance and convenient maintenance.

Description

Technical Field

[0001] This utility model belongs to the technical field of coal mine sprinkler systems, specifically relating to a fully automatic sprinkler system for coal mines based on PLC control. Background Technology

[0002] Coal mines generate large amounts of coal dust during mining, transportation, and loading / unloading. This dust not only affects underground air quality and visibility but also poses long-term health risks to workers. When the concentration of coal dust in the air reaches the explosive limit, it can also cause combustion or explosion accidents. Therefore, dust control has always been a key aspect of coal mine safety production. To reduce dust concentration, coal mines typically install spray systems that use atomized water jets to suppress dust in the air, thereby improving the tunnel environment and reducing safety hazards.

[0003] Currently, most coal mine sprinkler systems are controlled by manual switches or timers. Although they are simple in structure and low in cost, they suffer from low automation, slow response, single monitoring, and insufficient reliability. Existing coal mine sprinkler systems rely on a single sensor signal to trigger the sprinkler, and cannot dynamically adjust according to changes in dust concentration, roadway humidity, and water level. This results in the sprinkler range and intensity not matching the actual dust distribution. Furthermore, the corresponding control unit and execution unit lack unified logical linkage, making it difficult to achieve real-time feedback and remote management. Some equipment has a low protection level, and electrical interfaces are prone to moisture and short circuits, affecting system safety and service life. Therefore, they cannot meet current needs.

[0004] Therefore, there is an urgent need for a fully automatic spraying system for coal mines based on PLC control to overcome the shortcomings of traditional spraying devices in terms of control accuracy, environmental monitoring and protection reliability, and to realize intelligent and automated control of coal mine dust control. Utility Model Content

[0005] In view of this, this utility model proposes a fully automatic sprinkler system for coal mines based on PLC control, which is applied to the field of coal mine sprinkler system technology and solves the technical problems of low control accuracy, poor environmental monitoring effect and poor protection reliability in the existing system.

[0006] To achieve the above-mentioned technical objectives, the specific technical solution adopted by this utility model is as follows: A fully automatic sprinkler system for coal mines based on PLC control includes a PLC control cabinet, a human-machine interface, sensing units, execution units, and a water supply unit. The PLC control cabinet houses a PLC module, input / output modules, a network communication module, and a control module. An external host computer for ground monitoring is located on the outside of the PLC control cabinet. The human-machine interface includes an industrial touchscreen and a control software platform connected to the host computer. Connectors are located on the front wall of the PLC control cabinet, and the industrial touchscreen is electrically connected to the PLC module via these connectors. The sensing units include a dust sensor, an infrared sensor, and a liquid sensor. The level sensor has a fixed bracket on one side above the detection area corresponding to the sensing unit. The dust sensor is installed on the fixed bracket. Above the detection area is a tunnel and a roof plate inside the tunnel. A mounting base is installed on the roof plate. The infrared sensor is fixed to the roof plate position through the mounting base. The execution unit includes an atomizing nozzle, a flow guide fan, a variable frequency water pump, and a solenoid valve. The water supply unit includes a water tank, a water supply valve, and an anti-backflow hose. The water outlet of the water tank is connected in sequence to the solenoid valve, the variable frequency water pump, and the atomizing nozzle. The water tank is connected to the water supply valve through the anti-backflow hose. The level sensor is vertically installed on the inner wall of the water tank.

[0007] Furthermore, the PLC control cabinet is a mine-use explosion-proof and intrinsically safe structure. The interior of the PLC control cabinet is equipped with grounding terminals, dustproof ventilation holes and maintenance doors. The upper part of the PLC control cabinet is equipped with fiber optic access points and cable outlets to realize the protective connection between cables and communication optical fibers.

[0008] Furthermore, an infrared sensor is positioned above the monitoring area, and a support frame is installed on the inner wall of the water tank. The liquid level sensor is fixed to the inner wall of the water tank via the support frame to detect the water level.

[0009] Furthermore, the atomizing nozzles are arranged in rows along the cross section of the tunnel, and the spraying direction of the atomizing nozzles intersects with the air outlet direction of the guide fan. A support frame is provided on the downwind side of the atomizing nozzles, and the guide fan is installed on the support frame to guide the airflow direction during spraying.

[0010] Furthermore, an inlet pipe is provided between the water tank and the variable frequency water pump. The solenoid valve is installed on the inlet pipe, and the variable frequency water pump is connected to the inlet pipe via a flange connection. A flexible joint is provided on the inlet pipe to buffer pipe vibration.

[0011] Furthermore, the top of the water tank is equipped with an inspection port for maintenance, the bottom of the water tank is equipped with a drain outlet, the outer wall of the water tank is equipped with reinforcing ribs, the anti-backflow hose is covered with a metal braided protective layer, and limit clamps are installed at both ends of the anti-backflow hose to prevent loosening caused by high pressure backflow.

[0012] Furthermore, the network communication module is connected to the host computer via industrial optical fiber. The industrial optical fiber interface adopts a metal threaded fixing structure, and a shielded connection cable is provided between the network communication module and the PLC module to prevent electromagnetic interference.

[0013] Furthermore, shielded cables are used to connect the PLC control cabinet, human-machine interface, sensing unit and execution unit. Waterproof connectors are installed on the side wall of the PLC control cabinet. The shielded cable is introduced into the interior of the PLC control cabinet through the waterproof connectors. A sealing ring is installed at the connection between the waterproof connector and the PLC control cabinet to prevent moisture from entering the cabinet.

[0014] Furthermore, the atomizing nozzles and the guide fan in the execution unit are combined to form a spray assembly. The spray assembly is arranged in sections along the tunnel direction to form a continuous spray area. Mounting brackets are installed on the tunnel wall to fix the spray assembly. Connecting pipes are installed between different spray assemblies. Quick connectors are installed at both ends of the connecting pipes. Adjacent spray assemblies are connected through quick connectors to realize modular installation and disassembly.

[0015] By adopting the above technical solution, this utility model can also bring the following beneficial effects: 1. This utility model discloses a fully automatic coal mine sprinkler system based on PLC control. By introducing PLC control technology into the coal mine sprinkler system, the system achieves automated and intelligent management of sprinkler operations. The PLC control cabinet serves as the core control unit, working in conjunction with a host computer and human-machine interface to monitor and remotely adjust sprinkler parameters in real time. The sensing unit includes a dust sensor, an infrared sensor, and a liquid level sensor, which can comprehensively detect coal dust concentration, roadway environment, and water level status, realizing multi-signal data acquisition and automatic control command output. Through the collaborative work of the input / output module and network communication module, the system can dynamically determine the start and stop timing of the sprinkler based on the monitoring data, thereby effectively avoiding the problems of manual control lag and excessive sprinkler application, significantly improving the system response speed and operational reliability, and possessing the advantages of high automation, fast real-time response, and stable dust removal efficiency.

[0016] 2. This utility model discloses a fully automatic spraying system for coal mines based on PLC control. By adopting a coordinated control structure of atomizing nozzles, guide fans, variable frequency water pumps, and solenoid valves, it can automatically adjust the spraying range and intensity according to the dust concentration in different roadway sections. The water supply unit is equipped with anti-backflow hoses, flexible joints, and a metal braided protective layer structure to improve the system's sealing and durability. Mounting brackets are installed on the roadway walls. Different spraying components are modularly connected through connecting pipes and quick connectors, which facilitates installation and disassembly, as well as zonal maintenance. It can adapt to the complex and ever-changing working environment of coal mines and has the advantages of reasonable structural design, convenient maintenance, and strong safety protection performance. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the module connection of a PLC-controlled fully automatic sprinkler system for coal mines mentioned in this utility model. Figure 2 This is a schematic diagram of the structural connection of a PLC-controlled fully automatic sprinkler system for coal mines mentioned in this embodiment; Figure 3 This is a schematic diagram showing the positional relationship between the liquid level sensor and the water tank in this example; Figure 4 This is a schematic diagram showing the positional relationship between the spray assembly and the infrared sensor in this example; In the diagram: 1. PLC control cabinet; 2. Dust sensor; 3. Infrared sensor; 4. Liquid level sensor; 5. Atomizing nozzle; 6. Spray assembly; 7. Water tank; 8. Guide fan; 9. Water supply hydrant; 10. Variable frequency water pump; 11. Solenoid valve; 101. Human-machine interface; 102. Network communication module; 103. PLC module; 104. Control module. Detailed Implementation

[0019] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0020] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. This utility model can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. 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.

[0021] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this invention, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using other structures and / or functionalities besides one or more of the aspects set forth herein.

[0022] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0023] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details. Example

[0024] like Figures 1 to 4 As shown, this utility model provides a fully automatic sprinkler system for coal mines based on PLC control, including a PLC control cabinet 1, a human-machine interface 101, a sensing unit, an execution unit, and a water supply unit. The PLC control cabinet 1 is the core control component of the entire system, and it is equipped with a PLC module 103, an input / output module, a network communication module 102, and a control module 104. The PLC control cabinet 1 adopts a mine-grade explosion-proof and intrinsically safe structure. The upper part of the PLC control cabinet 1 is equipped with an optical fiber inlet and a cable outlet for safe introduction and protective connection of communication optical fibers and cables. The outer wall of the PLC control cabinet 1 is equipped with dustproof ventilation holes and maintenance doors. The interior of the PLC control cabinet 1 is equipped with grounding terminals to ensure the safe grounding and good heat dissipation of electrical components, thereby ensuring stable operation in high dust and humid environments. The front wall of the PLC control cabinet 1 is equipped with connectors, which are standard electrical connectors used for signal interconnection between the industrial touch screen and the PLC module 103. The outer side of the PLC control cabinet 1 is equipped with a host computer for ground monitoring. The host computer is connected to the network communication module 102 through industrial optical fiber for remote data transmission and system control.

[0025] The human-machine interface 101 includes an industrial touch screen and a control software platform connected to a host computer. The industrial touch screen is a flat display and input device installed on the front of the PLC control cabinet 1. It is used to display the data collected by each sensor unit and the spray status in real time, and to allow on-site operators to set parameters, switch modes, and perform manual intervention operations. The control software platform is a monitoring program running on the host computer. It can realize data storage, recording, historical curve display, and remote management, forming a two-way interactive control interface between humans and machines. The industrial touch screen is electrically connected to the PLC module 103 through connectors to ensure stable and reliable signal transmission.

[0026] The sensing unit includes a dust sensor 2, an infrared sensor 3, and a liquid level sensor 4. The dust sensor 2 is mounted on a fixed bracket above the corresponding detection area of ​​the sensing unit. The fixed bracket is fixed on the downwind side of the roadway near the wall. It is used to detect the concentration of coal dust in the air and output a corresponding electrical signal. The infrared sensor 3 is mounted on a mounting base on the ceiling inside the roadway. It is used to monitor the working activity status in the roadway and identify the presence of personnel or equipment by detecting changes in infrared reflection signals. The liquid level sensor 4 is vertically mounted on the inner wall of the water tank 7. It is used to detect changes in the liquid level of the water tank 7 in real time and feed the liquid level signal back to the PLC module 103. The output terminals of the dust sensor 2, infrared sensor 3, and liquid level sensor 4 are electrically connected to the input / output module, respectively. The input / output module transmits the collected signals to the PLC module 103. After processing, the PLC module 103 sends control commands to the control module 104.

[0027] The execution unit includes atomizing nozzles 5, a guide fan 8, a variable frequency water pump 10, and a solenoid valve 11. The atomizing nozzles 5 are arranged in rows along the cross section of the tunnel, and their spray direction intersects with the air outlet direction of the guide fan 8 to form an atomized airflow convergence zone, which is used to improve the uniformity of spray coverage. The guide fan 8 is installed on a support frame on the tunnel wall and is located on the downwind side of the atomizing nozzles 5. It is used to guide the airflow direction during spraying so that the atomized water flow is evenly diffused with the airflow. The variable frequency water pump 10 is installed in the tunnel water supply line and is connected to the water inlet pipe through a flange connection. It can automatically adjust the flow rate and pressure according to the PLC control signal. The solenoid valve 11 is installed on the water inlet pipe between the water tank 7 and the variable frequency water pump 10. It is used to control the water flow and realize rapid start and stop. The control terminals of each component of the execution unit are connected to the output terminals of the PLC module 103, so as to realize automated operation under the instructions of the PLC module 103.

[0028] The water supply unit includes a water tank 7, a water supply valve 9, and an anti-backflow hose. The water tank 7 is a metal water storage container, which can be replaced with other corrosion-resistant materials in actual use. It has an inspection port for maintenance on the top and a drain outlet on the bottom. The outer wall is reinforced with ribs to improve structural strength. The outlet of the water tank 7 is connected in sequence to a solenoid valve 11, a variable frequency water pump 10, and an atomizing nozzle 5 to form a continuous water supply path. The water tank 7 is connected to the water supply valve 9 through the anti-backflow hose. The anti-backflow hose is covered with a metal braided protective layer and has limit clamps at both ends to prevent high pressure backflow from causing the hose to loosen. The water supply pipeline is equipped with a flexible joint to absorb pressure fluctuations caused by the start and stop of the water pump and to prevent loosening of the connection caused by pipeline vibration or stress concentration.

[0029] Mounting brackets are evenly distributed on the walls of the tunnel. Each spray assembly 6 is fixed to the mounting brackets via connecting pipes. Connecting pipes are provided between different spray assemblies 6, and quick connectors are provided at both ends of the connecting pipes. Adjacent spray assemblies 6 are connected by quick connectors to form a continuous spray area. The spray assembly 6 is composed of atomizing nozzles 5 and guide fans 8, and is arranged in sections along the tunnel direction. When the system is running, it can realize regional spraying and segmented control.

[0030] During system operation, PLC module 103 first receives signal inputs from dust sensor 2, infrared sensor 3, and liquid level sensor 4. When dust sensor 2 detects that the dust concentration is higher than the set threshold, PLC module 103 issues a spray start command through logic judgment. Control module 104 drives solenoid valve 11 to open, variable frequency water pump 10 starts and supplies water to each spray component 6. Atomizing nozzle 5 sprays fine water mist, which is guided by guide fan 8 to form an atomized airflow in the tunnel, quickly reducing the concentration of coal dust in the air. When dust sensor 2 detects that the dust concentration is higher than the set threshold and infrared sensor 3 detects... When no personnel or vehicles are detected in the tunnel, the system enters the automatic sprinkler mode. When the level sensor 4 detects that the water level is below the lower limit, the PLC module 103 automatically issues a water replenishment command, replenishing water to the water tank 7 through the water supply hydrant 9 and the anti-backflow hose. After the sprinkler process ends, when the dust concentration returns to a safe range, the PLC module 103 automatically closes the solenoid valve 11 and the variable frequency water pump 10, the system stops sprinkler and enters standby mode. All operating status, sensor signals and fault alarm information are displayed in real time on the human-machine interface 101, and are also uploaded to the host computer for storage and monitoring.

[0031] In summary, this utility model achieves fully automated management of the entire process from data acquisition and logical judgment to execution control. The system has a rapid response, high control precision, and reliable operation. It can maintain a stable spraying effect and long-term operation capability in complex coal mine operating environments. It has the advantages of high automation, high monitoring accuracy, high spraying efficiency, strong safety protection performance, and convenient maintenance.

[0032] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A fully automatic sprinkler system for coal mines based on PLC control, comprising a PLC control cabinet, a human-machine interface, a sensing unit, an execution unit, and a water supply unit, characterized in that: The PLC control cabinet houses a PLC module, input / output module, network communication module, and control module. An external host computer for ground monitoring is located on the outside of the PLC control cabinet. The human-machine interface includes an industrial touchscreen and a control software platform connected to the host computer. Connectors are located on the front wall of the PLC control cabinet, and the industrial touchscreen is electrically connected to the PLC module via these connectors. The sensing unit includes a dust sensor, an infrared sensor, and a liquid level sensor. A fixed bracket is located on the side above the detection area corresponding to each sensing unit. The dust sensor is mounted on a fixed bracket. Above the detection area is a tunnel and a roof plate inside the tunnel. A mounting base is provided on the roof plate. The infrared sensor is fixed to the roof plate via the mounting base. The execution unit includes an atomizing nozzle, a flow guide fan, a variable frequency water pump, and a solenoid valve. The water supply unit includes a water tank, a water supply valve, and an anti-backflow hose. The outlet of the water tank is connected in sequence to the solenoid valve, the variable frequency water pump, and the atomizing nozzle. The water tank is connected to the water supply valve via the anti-backflow hose. The liquid level sensor is vertically mounted on the inner wall of the water tank.

2. The fully automatic sprinkler system for coal mines based on PLC control according to claim 1, characterized in that: The PLC control cabinet is a mine-use explosion-proof and intrinsically safe structure. The interior of the PLC control cabinet is equipped with a grounding terminal, dustproof ventilation holes and maintenance door. The upper part of the PLC control cabinet is equipped with an optical fiber inlet and a cable outlet for protective connection of cables and communication optical fibers.

3. The fully automatic sprinkler system for coal mines based on PLC control according to claim 2, characterized in that: The infrared sensor is positioned above the monitoring area, and a support frame is provided on the inner wall of the water tank. The liquid level sensor is fixed to the inner wall of the water tank via the support frame to detect the water level.

4. The fully automatic sprinkler system for coal mines based on PLC control according to claim 3, characterized in that: The atomizing nozzles are arranged in rows along the cross section of the tunnel. The spraying direction of the atomizing nozzles intersects with the air outlet direction of the guide fan. A support frame is provided on the downwind side of the atomizing nozzles. The guide fan is mounted on the support frame to guide the airflow direction during spraying.

5. A fully automatic sprinkler system for coal mines based on PLC control according to claim 4, characterized in that: An inlet pipe is provided between the water tank and the variable frequency water pump. The solenoid valve is installed on the inlet pipe. The variable frequency water pump is connected to the inlet pipe via a flange connection. A flexible joint is provided on the inlet pipe to buffer pipe vibration.

6. A fully automatic sprinkler system for coal mines based on PLC control according to claim 5, characterized in that: The water tank has an inspection port at the top for maintenance, a drain outlet at the bottom, and reinforcing ribs on the outer wall. The anti-backflow hose is covered with a metal braided protective layer and has limit clamps at both ends to prevent loosening caused by high pressure backflow.

7. A fully automatic sprinkler system for coal mines based on PLC control according to claim 6, characterized in that: The network communication module is connected to the host computer via an industrial optical fiber. The industrial optical fiber interface adopts a metal threaded fixing structure. A shielded connection cable is provided between the network communication module and the PLC module to prevent electromagnetic interference.

8. A fully automatic sprinkler system for coal mines based on PLC control according to claim 7, characterized in that: The PLC control cabinet, human-machine interface, sensing unit and execution unit are also connected by shielded cables. A waterproof connector is provided on the side wall of the PLC control cabinet. The shielded cable is introduced into the interior of the PLC control cabinet through the waterproof connector. A sealing ring is provided at the connection between the waterproof connector and the PLC control cabinet to prevent moisture from entering the cabinet.

9. A fully automatic sprinkler system for coal mines based on PLC control according to claim 8, characterized in that: The atomizing nozzle and the guide fan in the execution unit are combined to form a spray assembly. The spray assembly is arranged in sections along the direction of the tunnel to form a continuous spray area. The wall of the tunnel is provided with a mounting bracket for fixing the spray assembly. Connecting pipes are provided between different spray assemblies. Both ends of the connecting pipes are provided with quick connectors. Adjacent spray assemblies are connected through quick connectors to realize modular installation and disassembly.

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