Electro-hydraulic control coal mine goaf stopping agent intelligent spraying method and device

Abstract

The invention provides an electro-hydraulic control intelligent spraying method and device for a coal mine goaf stopping agent, and belongs to the technical field of coal mine fire prevention. The problem that at present, the underground inhibitor spraying effect is poor or spraying time is not timely is solved. A stopping agent spraying device is additionally arranged on the basis of an existing hydraulic support electro-hydraulic control device, stopping agent spraying control is carried out through the hydraulic support electro-hydraulic control device, and stopping agent spraying operation of a single support, multiple supports and a group can be carried out according to a program; the problem of spontaneous combustion of the residual coal in the goaf can be solved, accurate and intelligent spraying of the inhibitor after frame moving is achieved through the electro-hydraulic control technology, and the risk of fire outbreak of the residual coal in the coal mine goaf is effectively prevented.

Description

Technical Field

[0001] The invention provides an electro-hydraulic controlled intelligent spraying method and device for a coal mine goaf inhibitor, belonging to the technical field of coal mine fire prevention. Background Art

[0002] Spontaneous combustion of coal is one of the main disasters in my country's mines. In recent years, with the innovation of mining technology and the upgrading of coal mining equipment, while the efficiency of coal production at the working face has been improved, the mining depth of coal mines has been increasing, the mine pressure has increased, the gas has increased, and the difficulty of managing gas and fire prevention in the goaf has also increased. The fully-mechanized mining face has a lot of residual coal, a large ventilation negative pressure, serious air leakage, and a long time for mining suspension and removal. It is easy to cause spontaneous combustion in the goaf, which restricts the safety production and economic benefits of the fully-mechanized mining face.

[0003] With the acceleration of the intelligent process of coal mining, the penetration rate of hydraulic support electro-hydraulic control devices in major large-scale coal mining enterprises in China has reached a high level. With the continuous advancement of technology and the continuous expansion of on-site needs, the functions of hydraulic support electro-hydraulic control devices will become more and more perfect.

[0004] At present, the spraying of inhibitors in coal mine goafs is mostly done manually or with relatively simple devices. When using manual spraying, workers need to carry heavy spraying equipment, which not only consumes a lot of physical strength, but also has low work efficiency. Long-term manual operation can easily lead to uneven spraying, affecting the inhibitor effect. When using simple devices for spraying, these devices are often simple in design, single in function, and complex in operation. They fail to achieve automatic control and are difficult to guarantee the spraying effect. In addition, simple devices are prone to failure and damage, which will increase maintenance costs and time costs.

[0005] There are also some public patents for automatic spraying of inhibitors, such as the patent "CN112963192B-A circulating flame retardant device and method for goaf areas in mines", which uses a movable spraying device. However, the implementation of this solution requires the modification of the hydraulic support to set up a special base and guide rails, and spraying to the goaf area of ​​the working face between the hydraulic support frames through a special mobile device and a telescopic discharge pipe. This method is difficult to move and easily damaged due to the ups and downs of the coal mining working face, and can only operate at a single point. The capacity of the built-in storage tank is limited and it is difficult to meet the requirements of comprehensive and continuous spraying of the working face. There is also the patent "CN104329109A - A high-efficiency spraying system and method for inhibitors in goaf areas", which installs a high-pressure ball valve at the hydraulic support, but does not explain how the high-pressure ball valve is opened and closed, and adopts a centralized control method, that is, the spraying of the inhibitor is controlled by starting the inhibitor pump. Due to the use of centralized control and manual operation, the spraying operation can only be carried out uniformly after all hydraulic supports have completed one-cut mining. This spraying timing may cause the inhibitor to be sprayed untimely, thereby affecting its effect in preventing spontaneous combustion of coal seams. Summary of the invention

[0006] In order to solve the above technical problems, the present invention proposes an electro-hydraulic controlled intelligent spraying method and device for inhibitor in coal mine goaf.

[0007] The technical solution adopted by the present invention is: an electro-hydraulic controlled intelligent spraying device for inhibitors in coal mine goafs, including a support controller, a solenoid valve driver, and an electro-hydraulic controlled reversing valve. The support controller is connected to the solenoid valve driver to send control instructions to the solenoid valve driver. The solenoid valve driver receives the control instructions from the support controller and converts the control instructions into a switching signal of a certain function on the electro-hydraulic controlled reversing valve. It also includes an air valve, an inhibitor valve and a sprayer arranged on each hydraulic support. The electro-hydraulic controlled reversing valve of each hydraulic support is respectively connected to an air valve and an inhibitor valve. The air valve is connected to an external air source through a pipeline, and the inhibitor valve is connected to an external inhibitor through a pipeline. The air valve and the inhibitor valve are connected to the sprayer through a pipeline.

[0008] A plurality of gas valves are connected to the main gas line through branches respectively, and a plurality of inhibitor valves are connected to the main inhibitor pipeline through branches respectively.

[0009] The source of the main inhibitor pipeline is connected to the inhibitor pump station, and a flow sensor is installed at the outlet of the inhibitor pump station to monitor the instantaneous flow and cumulative flow of the inhibitor.

[0010] An electro-hydraulic controlled intelligent spraying method for a coal mine goaf of an inhibitor, based on an electro-hydraulic controlled intelligent spraying device for a coal mine goaf of an inhibitor, comprises the following steps: Step 1: Cutting coal; Step 2: Move the rack; Step 3: After the rack is moved, push the scraper conveyor; Step 4: Spraying inhibitor: After moving the rack, spray the inhibitor into the goaf.

[0011] Step 4 specifically includes: Step 4.1: The support controller receives external instructions and generates corresponding control instructions according to these instructions; Step 4.2: The solenoid valve driver receives the control instruction from the bracket controller and converts the control instruction into a switch signal for controlling the inhibitor spraying function on the electro-hydraulic control reversing valve; Step 4.3: After receiving the switch signal from the solenoid valve driver, the electro-hydraulic control reversing valve opens or closes the function port for spraying the inhibitor; Step 4.4: The function port of the electro-hydraulic controlled reversing valve is opened or closed, and the emulsion pressure signal drives the hydraulically controlled gas valve and the hydraulically controlled inhibitor valve to open or close simultaneously; Step 4.5: The gas valve and the inhibitor valve are opened at the same time, gas flows in from the gas pipeline and the inhibitor flows in from the inhibitor pipeline. After encountering the gas, the inhibitor passes through the sprayer and becomes foam or mist, and is sprayed into the goaf behind the hydraulic support; the gas valve and the inhibitor valve are closed at the same time, cutting off the flow of gas and inhibitor at the same time, and the spraying stops.

[0012] According to the automatic following process, the coal mining machine and the working face hydraulic support move forward in sequence until all the hydraulic supports are traversed. Each hydraulic support performs the operation of moving the support and then spraying the inhibitor in a predetermined order.

[0013] It is also possible to adopt a group spraying method. When all the hydraulic supports in the group have completed the frame movement, or when there is a need for group spraying, multiple hydraulic supports in the group can spray the inhibitor in the rear goaf area at the same time.

[0014] The function port for opening the inhibitor spray in step 4.3 is performed when the support controller issues an instruction to spray the inhibitor after the hydraulic support completes the frame shifting. The function port for closing the inhibitor spray in step 4.3 is performed when the support controller issues an instruction to complete the inhibitor spraying after the inhibitor spraying is completed.

[0015] The beneficial effects of the present invention compared to the prior art are as follows: the present invention integrates the inhibitor spraying device with the hydraulic support electro-hydraulic control device and fixes the spraying device on the hydraulic support, thereby reducing redundant equipment, avoiding repeated installation of pipelines and control units, and reducing the moving track of the inhibitor spraying device, thereby saving purchase costs and reducing subsequent maintenance and management costs; the integrated layout makes the equipment layout more compact and optimizes the use of space.

[0016] The support controller function of the hydraulic support electro-hydraulic control device is expanded, and the automatic control logic of the inhibitor spraying is introduced. In the automatic coal cutting and following process, the intelligent control of the inhibitor spraying can be realized according to the position of the coal mining machine and the position of the frame shifting. The method of the present invention enables the spraying operation to be carried out in time during the mining process, rather than uniformly spraying after a single mining is completed, which greatly improves the timeliness and effectiveness of the spraying.

[0017] Install flow sensors at the source of the inhibitor pipeline to monitor the instantaneous and cumulative flow of the inhibitor. Avoiding over- or under-spraying helps improve spraying effects and operating efficiency, while reducing material waste and environmental pollution. The bracket controller and flow sensor can be connected to the automated monitoring platform for remote control and data statistical analysis, providing scientific decision-making basis for coal mine management.

[0018] The use of the intelligent inhibitor spraying device reflects the close coordination and timing control between various devices in the coal mining process. Through refined operation and control, the efficiency and safety of coal mining operations are ensured, waste and environmental pollution are reduced, and the risk of spontaneous combustion in goaf areas is effectively reduced. Among them, the application of the intelligent inhibitor spraying device has improved the accuracy and efficiency of spontaneous combustion prevention and control, providing a strong guarantee for the safe production of coal mines. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the accompanying drawings: Figure 1 Pipeline layout diagram for tunnels and working faces; Figure 2 A control flow chart of intelligent spraying of inhibitor in goaf provided by an embodiment of the present invention; Figure 3 It is a control flow chart of intelligent spraying of inhibitor in goaf combined with coal cutting technology; In the figure: 1 is a bracket controller, 2 is a solenoid valve driver, 3 is an electro-hydraulic control reversing valve, 4 is an air valve, 5 is an inhibitor valve, and 6 is a sprayer. DETAILED DESCRIPTION

[0020] like Figures 1 to 3 As shown, the present invention provides an electro-hydraulic controlled intelligent spraying device for inhibitor in coal mine goaf. Most fully mechanized working faces use the traditional two-in-two-return liquid supply method to supply liquid to the main pipeline between hydraulic supports to ensure the liquid supply demand of hydraulic supports. The present invention adds a valve group, pipeline, and spraying mechanism dedicated to inhibitor spraying on the basis of the electro-hydraulic control device of the hydraulic support, and configures a control program dedicated to inhibitor spraying to achieve intelligent spraying of inhibitor in goaf.

[0021] The device proposed in the present invention specifically includes: a support controller 1, a solenoid valve driver 2, an electro-hydraulic control reversing valve 3, a gas valve 4, a retardant valve 5 and a sprayer 6. It should be noted that the support controller 1, the solenoid valve driver 2, and the electro-hydraulic control reversing valve 3 are all original equipment of the electro-hydraulic control system of the hydraulic support of the fully mechanized working face, and the gas valve 4, the retardant valve 5, and the sprayer 6 are additional equipment of the present invention.

[0022] The support controller 1 is the core, responsible for receiving external instructions (such as user input or preset program) and issuing corresponding control instructions according to preset logic and algorithm. The support controller 1 is connected to the solenoid valve driver 2 and sends the control instructions to the solenoid valve driver 2.

[0023] The solenoid valve driver 2 receives the control instruction from the bracket controller 1 and converts the control instruction into a switch signal for controlling a certain function on the electro-hydraulic control reversing valve 3. The solenoid valve driver 2 is connected between the bracket controller 1 and the electro-hydraulic control reversing valve 3.

[0024] The electro-hydraulic controlled reversing valve 3 is an actuator for controlling the action of the hydraulic support. It changes the on-off state of the valve core according to the switch signal of the solenoid valve driver 2, thereby controlling the action of the hydraulic support. In the present invention, the two-way liquid port of the electro-hydraulic controlled reversing valve 3 is used to control the switching state of the gas valve 4 and the inhibitor valve 5. The gas valve 4 and the inhibitor valve 5 are both hydraulically controlled one-way valves, and the gas valve 4 and the inhibitor valve 5 are kept opened or closed synchronously during the spraying process to ensure the mixing ratio of the inhibitor and the gas and the spraying effect. When the gas valve 4 and the inhibitor valve 5 are opened at the same time, the inhibitor passes through the sprayer 6 in a foam or mist state after encountering the gas, and is sprayed into the goaf behind the hydraulic support.

[0025] The gas valve 4 is connected to the gas pipeline. When the gas valve 4 is opened, the gas can flow into the sprayer 6; when the valve is closed, the gas flow is cut off.

[0026] The inhibitor valve 5 is connected to the inhibitor pipeline. When the inhibitor valve 5 is opened, the inhibitor can flow into the sprayer 6; when the valve is closed, the flow of the inhibitor is cut off.

[0027] The sprayer 6 is responsible for spraying the inhibitor uniformly to the target area. When the gas valve and the inhibitor valve are opened, the gas and the inhibitor enter the sprayer 6 through the pipeline, and the sprayer 6 sprays the inhibitor in the form of foam or mist. The amount and range of spraying can be adjusted according to the design of the sprayer and the control signal.

[0028] like Figure 1 As shown, the layout of the tunnel and the working face includes two pipelines: one for conveying gas and the other for conveying inhibitor. The gas valve 4 is installed on each hydraulic support of the working face and connected to the gas pipeline. The inhibitor valve 5 is installed on each hydraulic support of the working face and connected to the inhibitor pipeline. The sprayer 6 is also installed on each hydraulic support of the working face and connected to the gas valve 4 and the inhibitor valve 5. The source of the inhibitor pipeline is the inhibitor pump station. A flow sensor can be installed at the outlet of the inhibitor pump station to monitor the instantaneous flow and cumulative flow of the inhibitor.

[0029] Figure 3 The flowchart of the use of the intelligent spraying method of the inhibitor is described, which combines the specific process steps of coal mining operations and inhibitor spraying, aiming to ensure the efficiency and safety of the coal mining process while reducing the risk of spontaneous combustion in the goaf. The following is a detailed explanation of each step: Step 1: Coal cutting: The shearer cuts the top coal with its front drum and the bottom coal with its rear drum. The position of the shearer in this step is the core parameter in the automatic follow-up process.

[0030] Step 2: Frame moving: After the coal mining machine completes the coal cutting operation, the frame moving operation is carried out in time at a position 6-10 meters behind the rear drum of the coal mining machine. The frame moving is completed in a sequence of lowering-moving-lifting and other actions. Ensure the stability of the coal mining operation surface, prevent safety accidents such as roof falling, and create space for the subsequent scraper conveyor to move and the spraying of inhibitors. Specifically, in the automatic following process, set the parameter n1 as the distance between the frame moving position and the coal mining machine position.

[0031] Step 3: Pushing the scraper conveyor: After the hydraulic support is moved, push the scraper conveyor in groups. In the automatic follow-up process, set parameter n2 as the distance between the pusher (i.e., the pusher conveyor) position and the coal mining machine position.

[0032] Step 4: Spraying the inhibitor: After the hydraulic support is moved, the inhibitor can be sprayed into the goaf. In the automatic follow-up process, set parameter n3 as the distance between the inhibitor spraying position and the coal mining machine position. The inhibitor spraying action is controlled by time parameters.

[0033] Moreover, the spraying distance and time parameters are adjustable, which can make the spraying operation more flexible and adapt to different geological conditions and mining needs.

[0034] It should be noted that the above-mentioned actions of pushing the slide and spraying the inhibitor need to be associated with the completion of the rack shifting. Pushing the slide and spraying the inhibitor can only be performed after the rack shifting is completed.

[0035] Figure 2 The control process of intelligent spraying of inhibitor is described, and the specific steps are described as follows: Step 4.1: The support controller 1 receives external instructions (such as user input or preset programs) and generates corresponding control instructions based on these instructions.

[0036] Step 4.2: The solenoid valve driver 2 receives the control instruction from the bracket controller 1 and converts the control instruction into a switch signal for controlling the inhibitor spraying function on the electro-hydraulic control reversing valve 3 .

[0037] Step 4.3: After receiving the switch signal from the solenoid valve driver 2, the electro-hydraulic control reversing valve 3 opens or closes the functional port for spraying the inhibitor.

[0038] Step 4.4: The functional port of the electro-hydraulic controlled reversing valve 3 is opened or closed, and the emulsion pressure signal drives the hydraulically controlled gas valve 4 and the hydraulically controlled inhibitor valve 5 to open or close simultaneously.

[0039] Step 4.5: The gas valve 4 and the inhibitor valve 5 are opened at the same time, the gas flows in from the gas pipeline, and the inhibitor flows in from the inhibitor pipeline. After the inhibitor meets the gas, it passes through the sprayer 6 and becomes foam or mist, and is sprayed toward the goaf behind the hydraulic support. The gas valve 4 and the inhibitor valve 5 are closed at the same time, and the flow of gas and inhibitor is cut off at the same time, and the spraying stops.

[0040] According to the above automatic following process, as the coal mining machine cuts coal, each hydraulic support will perform the action of moving the frame and spraying the inhibitor. When the coal mining machine completes a cut, the entire goaf will be promptly sprayed with a layer of inhibitor in foam or mist form.

[0041] In addition, the spraying of the inhibitor can be carried out in groups in addition to spraying by a single frame according to the process sequence, and the group size can be adjusted as needed. When all the hydraulic supports in the group have completed the frame transfer, or there is a need for group spraying, multiple hydraulic supports in the group will spray the inhibitor in the rear goaf at the same time. This method allows the spraying of the inhibitor in the rear goaf of multiple hydraulic supports at one time, which can shorten the spraying time and reduce repeated spraying in the cross-area.

[0042] Compared with the existing patent "CN112963192B-A circulating flame retardant device and method for goaf areas under mines", the present invention arranges inhibitor pipelines along the hydraulic supports of the working face, and sets an inhibitor valve 5 and an air valve 4 on each hydraulic support. The spraying of the inhibitor is controlled by the electro-hydraulic control device of the hydraulic support. The sprayer 6 is set under the protective beam of the hydraulic support, and single-frame, multi-frame, and grouped inhibitor spraying operations can be carried out according to the procedure.

[0043] Compared with the existing patent "CN104329109A-A high-efficiency spraying system and spraying method of inhibitor in goaf area", the present invention installs a hydraulically controlled gas valve 4 and a hydraulically controlled inhibitor valve 5 at the hydraulic support. The two valves are controlled by an electro-hydraulic controlled reversing valve 3, and the electro-hydraulic controlled reversing valve 3 is controlled by a support controller 1. After the inhibitor pump is started, the inhibitor spraying of each hydraulic support can be controlled individually by the support controller 1 of the support. That is, the present invention adopts a distributed control method, and the support controller 1 can control the opening and closing of the inhibitor spraying of the support according to a preset automation program.

[0044] The invention uses distributed control and automated logic. The opening of the retardant spraying is automatically triggered by the hydraulic support moving forward to the position, and the closing of the retardant spraying is controlled by time. This design enables the spraying operation to be carried out in time during the mining process instead of after the first mining, which greatly improves the timeliness and effectiveness of the spraying.

[0045] The present invention realizes the intelligent upgrade of the inhibitor spraying system by expanding the functions of the support controller 1 of the hydraulic support electro-hydraulic control device and introducing the automatic control logic of the inhibitor spraying. The system can automatically adjust the opening and closing of the air valve and the inhibitor valve according to the moving state of the hydraulic support and the preset time parameters, thereby improving the intelligent level of the inhibitor spraying operation.

[0046] 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 replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electro-hydraulic controlled intelligent spraying device for retardant in coal mine goaf, comprising a support controller, a solenoid valve driver, and an electro-hydraulic controlled reversing valve, wherein the support controller is connected to the solenoid valve driver, and sends a control instruction to the solenoid valve driver, and the solenoid valve driver receives the control instruction from the support controller and converts the control instruction into a switch signal of a certain function on the electro-hydraulic controlled reversing valve, characterized in that: It also includes an air valve, an inhibitor valve and a sprayer arranged on each hydraulic support. The electro-hydraulic controlled reversing valve of each hydraulic support is respectively connected to an air valve and an inhibitor valve. The air valve is connected to an external air source through a pipeline, the inhibitor valve is connected to an external inhibitor through a pipeline, and the air valve and the inhibitor valve are connected to the sprayer through a pipeline.

2. According to claim 1, the electro-hydraulic controlled intelligent spraying device for retardant in coal mine goaf is characterized by: A plurality of gas valves are connected to the main gas line through branches respectively, and a plurality of inhibitor valves are connected to the main inhibitor pipeline through branches respectively.

3. The electro-hydraulic controlled intelligent spraying device for retardant in coal mine goaf according to claim 2 is characterized in that: The source of the main inhibitor pipeline is connected to the inhibitor pump station, and a flow sensor is installed at the outlet of the inhibitor pump station to monitor the instantaneous flow and cumulative flow of the inhibitor.

4. An electro-hydraulic controlled intelligent spraying method for a coal mine goaf of an inhibitor, based on the electro-hydraulic controlled intelligent spraying device for a coal mine goaf of an inhibitor according to any one of claims 1 to 3, characterized in that: The following steps are involved: Step 1: Cutting coal; Step 2: Move the rack; Step 3: After the rack is moved, push the scraper conveyor; Step 4: Spraying inhibitor: After moving the rack, spray the inhibitor into the goaf.

5. The method for intelligent spraying of inhibitor in coal mine goaf with electro-hydraulic control according to claim 4 is characterized in that: Step 4 specifically includes: Step 4.1: The support controller receives external instructions and generates corresponding control instructions according to these instructions; Step 4.2: The solenoid valve driver receives the control instruction from the bracket controller and converts the control instruction into a switch signal for controlling the inhibitor spraying function on the electro-hydraulic control reversing valve; Step 4.3: After receiving the switch signal from the solenoid valve driver, the electro-hydraulic control reversing valve opens or closes the function port for spraying the inhibitor; Step 4.4: The function port of the electro-hydraulic controlled reversing valve is opened or closed, and the emulsion pressure signal drives the hydraulically controlled gas valve and the hydraulically controlled inhibitor valve to open or close simultaneously; Step 4.5: The gas valve and the inhibitor valve are opened at the same time, gas flows in from the gas pipeline and the inhibitor flows in from the inhibitor pipeline. After encountering the gas, the inhibitor passes through the sprayer and becomes foam or mist, and is sprayed into the goaf behind the hydraulic support; the gas valve and the inhibitor valve are closed at the same time, cutting off the flow of gas and inhibitor at the same time, and the spraying stops.

6. The method for intelligently spraying an inhibitor in a coal mine goaf with electro-hydraulic control according to claim 5 is characterized in that: According to the automatic following process, the coal mining machine and the working face hydraulic support move forward in sequence until all the hydraulic supports are traversed. Each hydraulic support performs the operation of moving the support and then spraying the inhibitor in a predetermined order.

7. The method for intelligently spraying an inhibitor in a coal mine goaf in an electro-hydraulic controlled manner according to any one of claims 4 to 6, characterized in that: It is also possible to adopt a group spraying method. When all the hydraulic supports in the group have completed the frame movement, or when there is a need for group spraying, multiple hydraulic supports in the group can spray the inhibitor in the rear goaf area at the same time.

8. The method for intelligently spraying an inhibitor in a coal mine goaf with electro-hydraulic control according to claim 7 is characterized in that: The function port for opening the inhibitor spray in step 4.3 is performed when the support controller issues an instruction to spray the inhibitor after the hydraulic support completes the frame shifting. The function port for closing the inhibitor spray in step 4.3 is performed when the support controller issues an instruction to complete the inhibitor spraying after the inhibitor spraying is completed.

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