Backflush control method, system, and media for fully mechanized mining faces

Abstract

This application discloses a backwashing control method, system, and medium for fully mechanized mining faces. The method includes: detecting the current operating area of ​​the coal mining machine on the face; when the coal mining machine is operating in the initial or final triangular coal working area of ​​the face, determining whether a backwashing control command has been received from the control center; if so, controlling the backwashing of the corresponding hydraulic support's own backwashing filter according to the backwashing control command; and controlling a preset number of hydraulic supports' own backwashing filters when no backwashing control command has been received. This method integrates face backwashing with the coal mining process, controlling the hydraulic supports to perform backwashing when the demand for emulsion is low, thus avoiding the impact of backwashing on the normal coal mining operation of the hydraulic supports.

Description

Technical Field

[0001] This application relates to the field of intelligent control technology for fully mechanized mining faces, and in particular to a backwashing control method, system and medium for fully mechanized mining faces. Background Technology

[0002] Currently, hydraulic supports are used in coal mining operations at fully mechanized longwall faces. These supports are structures used to control mine pressure and can perform automatic pushing and shifting actions in conjunction with the mining process. To enable the hydraulic supports to operate, an emulsion needs to be supplied to them.

[0003] Backwash filters are crucial devices in hydraulic support systems for removing impurities from emulsions. Specifically, a backwash filter is a precision device that uses a filter screen to directly intercept impurities in the working medium (such as water or emulsions), removing suspended solids and particulate matter, reducing turbidity, purifying the working medium, and minimizing the generation of system dirt, algae, and corrosion. This purifies the working medium and protects the normal operation of other equipment in the system. Figure 1 As shown, the backwash filter includes an electromagnetic pilot valve 1, a liquid inlet 2, a liquid outlet 3, and a drain port 4. Liquid before filtration enters through the liquid inlet 2, is filtered, and then discharged through the liquid outlet 3. Simultaneously, the backwash filter can perform reverse rinsing of the filter screen; the backwashed wastewater is discharged through the drain port 4, achieving the purpose of backwashing and cleaning the filter screen.

[0004] In related technologies, there are two main methods for backwashing of underground backwash filters: the first is manual control of the backwash filter via a controller, and the second is timed backwashing via a pre-programmed sequence. However, both of these backwashing control methods have poor backwashing efficiency and may affect the normal coal mining operations of the longwall face. Summary of the Invention

[0005] The purpose of this application is to at least partially solve one of the aforementioned technical problems.

[0006] Therefore, the first objective of this application is to propose a backwashing control method for fully mechanized mining faces. This method integrates backwashing with the coal mining process, controlling backwashing of the hydraulic supports when their emulsion demand is low. This avoids the impact of emulsion discharge during backwashing on the fluid volume required for normal operation of the hydraulic supports, ensuring that the fluid supply to the supports is not insufficient due to emulsion flow loss caused by backwashing. This guarantees the fluid demand of the working face and reduces the impact of backwashing on the automated operation of the hydraulic supports. Furthermore, it avoids backwashing when it is not needed, preventing emulsion waste and reducing backwashing costs.

[0007] The second objective of this application is to propose a backwashing control system for fully mechanized mining faces.

[0008] The third objective of this application is to propose a non-transitory computer-readable storage medium.

[0009] To achieve the above objectives, the first aspect of this application proposes a backwashing control method for a fully mechanized mining face, the method comprising:

[0010] Detect the current working area of ​​the coal mining machine on the working face;

[0011] When the coal mining machine is operating in the starting or ending triangular coal working area of ​​the working face, it determines whether it has received a backwashing control command from the background control center. If so, it controls the corresponding hydraulic support to backwash its own backwashing filter according to the backwashing control command.

[0012] In the absence of the backwash control command, a preset number of hydraulic supports are controlled to backwash their own backwash filters.

[0013] In addition, the backwashing control method for fully mechanized mining faces in this application embodiment also has the following additional technical features:

[0014] Optionally, in some embodiments, before controlling the backwashing of the backwashing filter of the hydraulic support itself, the method further includes: detecting whether each of the hydraulic supports meets the backwashing conditions; and selecting the hydraulic support that meets the backwashing conditions as the target hydraulic support for performing the backwashing operation.

[0015] Optionally, in some embodiments, detecting whether each hydraulic support meets the backwashing conditions includes: detecting the pressure difference between the inlet pressure and the outlet pressure of the backwash filter of each hydraulic support; comparing the pressure difference value corresponding to each hydraulic support with a preset backwash pressure difference; if the pressure difference value corresponding to any hydraulic support is greater than the backwash pressure difference, then determining that any hydraulic support is the target hydraulic support.

[0016] Optionally, in some embodiments, the method further includes: detecting whether the following speed of each hydraulic support meets the automated following requirements of the working face; and controlling the hydraulic supports whose following speed meets the automated following requirements to perform a backwashing operation.

[0017] Optionally, in some embodiments, before detecting the current working area of ​​the coal mining machine on the working face, the method further includes: installing a first signal transmission device on each of the hydraulic supports and installing a second signal transmission device on the coal mining machine; determining the number and number of hydraulic supports corresponding to the starting triangular coal working area and the ending triangular coal working area respectively; the detection of the current working area of ​​the coal mining machine on the working face includes: determining whether the coal mining machine is in the starting triangular coal working area or the ending triangular coal working area based on the position information transmitted between the first signal transmission device and the second signal transmission device.

[0018] Optionally, in some embodiments, after performing the backwashing operation, the method further includes: real-time detection of the differential pressure value of the backwashing filter after the update for each target hydraulic support; comparing the updated differential pressure value corresponding to each target hydraulic support with a preset fault differential pressure; if the updated differential pressure value corresponding to any target hydraulic support is greater than the fault differential pressure, then controlling the target hydraulic support to continue performing the backwashing operation; recording the number of times the backwashing operation is performed for any target hydraulic support; and after the number of performances reaches a preset backwashing count threshold, if the current differential pressure value of any target hydraulic support is still greater than the fault differential pressure, then controlling the preset backwashing module of any target hydraulic support to issue an alarm.

[0019] Optionally, in some embodiments, after performing the backflushing operation, the method further includes: detecting the backflushing frequency of each target hydraulic support per unit time; comparing the backflushing frequency of each target hydraulic support with a preset fault frequency; and if the backflushing frequency of any target hydraulic support is greater than the fault frequency, controlling the preset backflushing module of any target hydraulic support to issue an alarm.

[0020] To achieve the above objectives, a second aspect of the present invention provides a backwashing control system for a fully mechanized mining face, comprising:

[0021] The detection module is used to detect the current working area of ​​the coal mining machine on the working face;

[0022] The first control module is used to determine whether a backwashing control command sent by the background control center is received when the coal mining machine is operating in the starting triangular coal working area or the ending triangular coal working area of ​​the working face. If so, the corresponding hydraulic support is controlled to backwash its own backwashing filter according to the backwashing control command.

[0023] The second control module is used to control a preset number of hydraulic supports to backwash their own backwash filters when no backwash control command is received.

[0024] Optionally, in some embodiments, the first control module is further configured to: detect whether each of the hydraulic supports meets the backwashing conditions; and select the hydraulic support that meets the backwashing conditions as the target hydraulic support for performing the backwashing operation.

[0025] The technical solution provided by the embodiments of this application brings at least the following beneficial effects: This application combines backwashing of the working face with the coal mining process, controlling the hydraulic support to perform backwashing when the demand for emulsion is low, ensuring the hydraulic fluid demand of the working face, avoiding the impact of emulsion discharge during backwashing on the hydraulic support's normal operation, ensuring that the support's fluid supply is not insufficient due to emulsion flow loss caused by backwashing, reducing the impact of backwashing on the automated following of the hydraulic support, and achieving that the backwashing of the hydraulic support and the coal mining process do not interfere with each other. Furthermore, when performing backwashing using the solution of this application, parameters such as the backwashing area and backwashing time can be determined in different ways according to actual conditions, further avoiding the impact of hydraulic support backwashing on coal mining operations, avoiding unnecessary backwashing leading to emulsion waste, and reducing backwashing costs.

[0026] A third aspect of this application provides a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to cause the computer to execute the backwashing control method for the fully mechanized mining face disclosed in the embodiments of this application.

[0027] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0028] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0029] Figure 1 This is a schematic diagram of the structure of a backwash filter according to an embodiment of this application;

[0030] Figure 2 This is a schematic diagram of the structure of a specific hydraulic support system proposed in an embodiment of this application;

[0031] Figure 3 This is a schematic flowchart of a backwashing control method for a fully mechanized mining face proposed in an embodiment of this application;

[0032] Figure 4 This is a schematic diagram of a specific fully mechanized mining face working scene proposed in an embodiment of this application;

[0033] Figure 5A flowchart illustrating a specific backwashing control method for a fully mechanized mining face as proposed in this application embodiment;

[0034] Figure 6 This is a schematic diagram of a working scenario for pressure monitoring of a backwash filter according to an embodiment of this application;

[0035] Figure 7 A flowchart illustrating another specific backwashing control method for a fully mechanized mining face proposed in this application embodiment;

[0036] Figure 8 This is a schematic diagram of the backwashing control system for a fully mechanized mining face proposed in an embodiment of this application. Detailed Implementation

[0037] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0038] To facilitate understanding of the backwashing control method for fully mechanized mining faces in this application, the following will first combine... Figure 2 The working process of an automatic backwashing system for a hydraulic support system is described. For example... Figure 2 As shown, the emulsion first enters the inlet / outlet multi-channel block 10 of the support system from the high-pressure filter station, and then the high-pressure liquid enters the automatic backwash filter 20 for filtration. The filtered emulsion then enters the main valve 30 through the backwash filter, and subsequently enters each moving jack to drive the movement of the hydraulic support. The automatic backwash filter 20 is connected to the controller 40 of the hydraulic support system via control cables, and the controller 40 can control the backwash filter 20 to perform backwashing. Each hydraulic support in the longwall mining face can be automatically backwashed according to the above process.

[0039] Based on the above working method, the relevant technology can manually control the controller to control the backwashing of the backwash filter, or set the backwashing time by writing a program, such as setting a preset time interval of 1 hour or 2 hours, after which the entire working surface is backwashed.

[0040] However, the aforementioned method of manual backwashing via controller has the following drawbacks: First, the workload of manual control is substantial. Backwashing all of the dozens to hundreds of hydraulic supports in the entire longwall mining face is time-consuming and labor-intensive. Second, for hydraulic supports located in thin coal seams, workers primarily move by crawling, resulting in a poor working environment that hinders movement and control. Third, manual operation is inherently unpredictable, potentially leading to omissions or incomplete backwashing. Fourth, manual backwashing is detrimental to the development trend of unmanned underground mining faces.

[0041] The above-mentioned timed backflushing method has the following drawbacks: First, the time parameter for the timed backflushing interval cannot be accurately determined. In practical applications, the operation of hydraulic supports is uncertain; that is, the hydraulic support may be in operation, but backflushing may begin after the interval has elapsed, affecting the normal operation of the hydraulic support. Second, a crucial technical indicator in face-following automation is the following speed. Only when the operating speed of the hydraulic support meets the coal cutting speed of the coal mining machine can normal face-following automation be achieved. Besides the emulsion pressure, the emulsion flow rate is also crucial for ensuring the following speed. During normal face-following automation, a large amount of backflushing during timed backflushing wastes a significant amount of emulsion, leading to insufficient emulsion supply to the operating jacks and affecting the automatic following speed. Third, once the timed backflushing program is set, it will continuously perform backflushing according to the relevant procedure. Even when the hydraulic support is not working, for example, when the working equipment is under maintenance (e.g., stopped for 8 to 10 hours), and the backflushing filter has not been filtered for a period of time and does not require backflushing, backflushing will still occur according to the program, resulting in a large waste of emulsion and increasing the cost of coal mining. Fourth, if the backflushing interval is set too short, a large amount of emulsion will be wasted. If the interval is set too long, the backflushing filter may become severely clogged when backflushing is needed, causing blockage and affecting the support's operating speed, thus impacting the follow-up speed. Fifth, the preparation of emulsion requires a large amount of treated clean water. Timed backflushing wastes emulsion and requires a large amount of clean water to prepare new emulsion, leading to water resource waste and insufficient water supply to the tank.

[0042] Therefore, this application proposes a backwashing control method and system for fully mechanized mining faces. This application combines backwashing of the working face with the coal mining process, controls the hydraulic support to perform backwashing when the demand for emulsion is low, avoids the impact of backwashing on the normal coal mining operation of the hydraulic support, and improves the backwashing effect.

[0043] The backwashing control method and system for fully mechanized mining faces according to embodiments of this application are described below with reference to the accompanying drawings.

[0044] Figure 3 This is a flowchart of a backwashing control method for a fully mechanized mining face proposed in an embodiment of this application, as shown below. Figure 3 As shown, the system includes the following steps:

[0045] Step S101: Detect the current working area of ​​the coal mining machine on the working face.

[0046] Specifically, the entire area to be mined on the longwall face is pre-divided into different working areas according to the mining situation. For example, a triangular coal working area is defined. When the coal mining machine is operating in different areas, each hydraulic support performs corresponding actions to follow the coal mining machine. When performing backwashing control in this application, the current working area of ​​the coal mining machine is first detected.

[0047] Triangular coal refers to the triangular-shaped coal left on the working face due to reasons such as the coal wall and the roadway being obliquely intersecting, resulting in the cutting point not being straight. Triangular coal working areas usually exist at the head (initial position) and tail (end position) of the working face, namely the initial triangular coal working area and the end triangular coal working area.

[0048] In practical implementation, one possible approach is to record the location information of different work areas when determining the operational zones of the area to be mined, and to pre-install Ultra Wide Band (UWB) tags on the coal mining machine and set up UWB base stations on the longwall face. During operation, the coal mining machine's current position is determined using UWB positioning technology, and then compared with the location information corresponding to different work areas to determine the current operational zone of the coal mining machine on the working face.

[0049] As another possible way to detect whether the coal mining machine is currently in the starting or ending triangular coal working area, a first signal transmission device is pre-installed on each hydraulic support, and a second signal transmission device is installed on the coal mining machine. The number and number of hydraulic supports corresponding to the starting and ending triangular coal working areas are determined respectively. Then, based on the position information transmitted between the first and second signal transmission devices, it is determined whether the coal mining machine is in the starting or ending triangular coal working area.

[0050] Specifically, such as Figure 4 As shown, after configuring a total of M hydraulic supports on the mining area 1000 of the working face, N1 hydraulic supports are set up corresponding to the initial triangular coal working area 1001, that is, supports numbered from 1 to N1. For example, Figure 4Supports 1 through 4 are designated as follows: Hydraulic supports N2 correspond to the final triangular coal working area 1002, i.e., supports numbered N2 through M. N1 and N2 can be the same or different. The first signal transmission device installed on the hydraulic supports can be a signal receiver, specifically including but not limited to an infrared signal receiver. The second signal transmission device installed on the coal mining machine 2000 can be a signal transmitter, correspondingly including but not limited to an infrared signal transmitter. When the coal mining machine 2000 moves and cuts coal at the working face, the signal transmitter continuously sends position information to the signal receivers of the surrounding hydraulic supports. Based on the position information currently received by the signal receivers of the hydraulic supports, it is determined whether the coal mining machine is in the initial or final triangular coal working area. For example, the position information sent by the signal transmitter determines the number of the main support currently receiving the position information. Since the support numbers corresponding to the initial or final triangular coal working area have been determined, the support number determines whether it corresponds to either the initial or final triangular coal working area.

[0051] It should be noted that the type of signal transmission equipment installed on the hydraulic support and the coal mining machine can be set according to the actual situation, as long as it can ensure that the position signal sent by the transmitter can be received for position determination. For example, under certain working conditions, a signal transmitter can be installed on the hydraulic support, or other types of signal transmitters can be installed on the coal mining machine. Of course, this application can also detect the current working area of ​​the coal mining machine on the working face through other methods. The above method is only an example, and the specific implementation method is not limited here.

[0052] Step S102: When the coal mining machine is operating in the starting or ending triangular coal working area of ​​the working face, determine whether a backwashing control command sent by the background control center has been received. If so, control the corresponding hydraulic support to backwash its own backwashing filter according to the backwashing control command.

[0053] The background control center includes a monitoring center for the fully mechanized mining face underground and a monitoring and dispatching center on the surface. The backwashing control command includes control parameters such as the backwashing switch and flushing time, and commands the corresponding hydraulic supports to perform backwashing according to the control parameters.

[0054] It should be noted that during backwashing of the automatic backwash filter, the emulsion is discharged through the drain port after backwashing the filter screen and does not enter the hydraulic support, reducing the amount of emulsion supplied to the hydraulic support and thus affecting its operation. However, when the coal mining machine is cutting coal in the initial or final triangular coal face, this is the period with the lowest demand for emulsion, and the hydraulic supports across the entire working face hardly need to perform any actions. Therefore, this application proposes backwashing when the coal mining machine is operating in the initial or final triangular coal face, utilizing the idle time of the hydraulic supports during the coal mining process to reduce the impact on the automated operation of the hydraulic supports.

[0055] In the embodiments of this application, when it is determined that the coal mining machine is currently operating in the initial triangular coal working area or the final triangular coal working area, backwashing can be performed through different control methods.

[0056] One possible implementation is to first determine whether a backwashing control command has been received from the back-end control center. If so, the corresponding hydraulic support is controlled to backwash its own backwash filter according to the backwashing control command. Specifically, a backwashing control function is added to the automation control application interface of the host computer in the back-end control center. The host computer can remotely issue backwashing control commands including parameters such as backwashing switch and time. Based on this command, the hydraulic supports on the working face can be remotely started with one click to perform backwashing sequentially, or the hydraulic supports in a specific section can be controlled to quickly start and perform backwashing in groups. The hydraulic supports performing backwashing and the backwashing time can be determined according to the control parameters in the control command. That is, the host computer sets the control parameters when generating the backwashing control command, and the hydraulic supports perform backwashing according to the control parameters. Thus, it is possible to control the backwashing of the corresponding hydraulic support's own backwash filter by issuing backwashing control commands through remote parameter configuration.

[0057] Step S103: In the absence of a backwash control command, control a preset number of hydraulic supports to backwash their own backwash filters.

[0058] In this embodiment of the application, a backwashing program can be preset, and in the absence of a backwashing control command, a preset number of hydraulic supports can be controlled to backwash their own backwashing filters according to the backwashing program.

[0059] Specifically, in this embodiment, the backwashing program is configured directly in the software. For example, the backwashing program is configured in the controller of the hydraulic support system. When configuring the program, the number of hydraulic supports to be backwashed can be set according to actual needs. For example, during the period when the coal mining machine is operating in a triangular coal working area, all supports, half of the supports, and one-third of the supports on the working face are backwashed.

[0060] It should be noted that the remote configuration control parameter control method in the above embodiments can be executed in parallel with the control method in this step, and the specific execution order is not restricted here.

[0061] For example, a backwash control command can be executed first, and if no backwash control command is received, backwashing can proceed according to the backwashing procedure. Alternatively, after the coal mining machine is located in the initial or final triangular coal working area, both the backwash control command and the backwashing procedure can be executed simultaneously. For instance, the first half of the supports can be backwashed according to the backwashing procedure, and then a specific section of the remaining half can be backwashed according to the backwash control command. Another option is to execute the backwash control command after backwashing according to the backwashing procedure. For example, after backwashing a preset number of supports according to the backwashing procedure, the operator can determine which supports still need backwashing and set the backwash control command, controlling the corresponding hydraulic supports to backwash their own backwash filters according to the command.

[0062] In summary, the backwashing control method for fully mechanized mining faces in this application combines backwashing with the coal mining process. It controls the hydraulic supports to perform backwashing when the demand for emulsion is low, ensuring the hydraulic fluid requirements of the working face. This avoids the impact of emulsion discharge during backwashing on the hydraulic support's normal operation, ensuring that the support's fluid supply is not insufficient due to emulsion flow loss caused by backwashing. It also reduces the impact of backwashing on the automated following of the hydraulic supports, achieving a separation between hydraulic support backwashing and the coal mining process. Furthermore, when performing backwashing using this method, parameters such as the backwashing area and backwashing time can be determined in different ways according to actual conditions, further avoiding the impact of hydraulic support backwashing on coal mining operations, preventing unnecessary backwashing that leads to emulsion waste, and saving backwashing costs.

[0063] Based on the above embodiments, the backwashing control method of this application can also monitor the working status of a single hydraulic support or a group of hydraulic supports individually, and perform backwashing on hydraulic supports that have reached the washable index, thereby controlling the hydraulic supports that need backwashing to be directly flushed according to the actual blockage of the hydraulic supports. That is, in one embodiment of this application, before controlling the backwashing of the backwashing filter of the hydraulic support itself, it also includes detecting whether each hydraulic support meets the backwashing conditions, and selecting the hydraulic supports that meet the backwashing conditions as the target hydraulic supports for performing the backwashing operation. In order to more clearly illustrate the specific implementation process of controlling the backwashing of hydraulic supports that meet the backwashing conditions according to the backwashing conditions, a specific embodiment will be described in detail below.

[0064] Figure 5A flowchart illustrating a specific backwashing control method for a fully mechanized mining face, as proposed in this application embodiment, is shown below. Figure 5 As shown, the method includes the following steps:

[0065] Step S501: Detect the pressure difference between the inlet pressure and the outlet pressure of the backwash filter of each hydraulic support.

[0066] Specifically, in this embodiment, a pressure monitoring system for the backwash filter of the hydraulic support is pre-set to collect the pressure values ​​of the inlet and outlet of the backwash filter of each hydraulic support in real time.

[0067] As an example, such as Figure 6 As shown, a first pressure sensor 2 is installed at the inlet P of the backwash filter 1, and a second pressure sensor 3 is installed at the outlet A. These two pressure sensors can collect the pressure values ​​at the inlets in real time, i.e., detect the inlet pressure Y1 and the outlet pressure Y2. Then, the collected pressure values ​​are converted into digital information and transmitted to the controller of the hydraulic support system. The controller subtracts the inlet pressure from the outlet pressure to obtain the pressure difference between the inlet and outlet pressures of the backwash filter. In this example, the pressure sensors can be integrated into the body of the backwash filter, and the above functions can be achieved by placing the pressure sensors in the channel connecting the inlet and outlet.

[0068] As another example, a differential pressure gauge capable of outputting a signal can be installed and connected to the inlet and outlet of the backwash filter. This gauge directly measures the pressure difference between the filter's inlet and outlet. The signal is then converted into digital information and transmitted to the controller of the hydraulic support system, which directly receives the pressure difference value. In this example, the differential pressure gauge capable of outputting a signal is integrated into the backwash filter body, and the above function is accomplished through a channel connecting the inlet and outlet.

[0069] Step S502: Compare the differential pressure value corresponding to each hydraulic support with the preset back pressure differential.

[0070] Step S503: If the differential pressure value corresponding to any hydraulic support is greater than the backflushing differential pressure, then the hydraulic support is determined to be the target hydraulic support for performing the backflushing operation.

[0071] Specifically, a backflushing module is installed in the controller of the hydraulic support system. This module is configured with four parameters: backflushing differential pressure N, backflushing time M, fault differential pressure G, and fault frequency P. The differential pressure value corresponding to each hydraulic support is compared with the preset backflushing differential pressure N. If the differential pressure value corresponding to any hydraulic support is greater than the backflushing differential pressure, indicating that the differential pressure value of the backflushing filter for that hydraulic support is greater than the backflushing differential pressure N, then that hydraulic support is determined to be the target hydraulic support for the backflushing operation.

[0072] The target hydraulic support can be one or more, determined based on the actual calculation results of all hydraulic supports. The target hydraulic support is the hydraulic support that meets the backwashing conditions and can perform the backwashing control in the above embodiments.

[0073] In one embodiment of this application, the target hydraulic support can also be directly controlled to perform backwashing based on the current detection results. In this embodiment, when the pressure difference Y is greater than the backwash pressure difference N, the controller of the target hydraulic support directly outputs a backwash signal S1 to control the solenoid pilot valve to operate, thereby completing the backwashing action. Specifically, during backwashing, control parameters in the backwash module can be read. For example, the backwashing action time of the hydraulic support can be determined based on the backwashing time M. The time parameter M can be set individually or as a system based on the site conditions. The system setting means that the backwashing time of all hydraulic supports on the working face is set to M, while the individual setting means that the backwashing time of a certain numbered support on the working face is M'. Each support can be set independently to avoid affecting the setting of the backwashing time of other supports.

[0074] In one embodiment of this application, an alarm function can also be configured for the backflushing module to detect whether the support has malfunctioned after the hydraulic support is backflushed.

[0075] As one possible implementation, after the target hydraulic support performs a backwashing operation, the following steps are also included: real-time detection of the differential pressure value after the backwashing filter of each target hydraulic support is updated; comparison of the updated differential pressure value corresponding to each target hydraulic support with a preset fault differential pressure; if the updated differential pressure value corresponding to any target hydraulic support is greater than the fault differential pressure, then control any target hydraulic support to continue performing a backwashing operation; recording the number of times the backwashing operation of any target hydraulic support is performed; after the number of performances reaches a preset backwashing number threshold, if the current differential pressure value of any target hydraulic support is still greater than the fault differential pressure, then control the preset backwashing module of any target hydraulic support to issue an alarm.

[0076] It should be noted that, under normal circumstances, after automatic backwashing, the backwash filter only needs to perform one or two backwashing operations to meet the requirements before stopping backwashing. However, when the backwash filter malfunctions, multiple backwashing operations may still fail to achieve the expected flushing effect. Therefore, in order to detect whether the backwash filter has malfunctioned, in this embodiment, after the target hydraulic support performs a backwashing operation, the pressure difference value of the backwash filter of each target hydraulic support after flushing is detected in real time, i.e., the currently updated pressure difference value. The updated pressure difference value corresponding to each target hydraulic support is compared with the preset fault pressure difference. If the updated pressure difference value corresponding to any one or more target hydraulic supports is greater than the fault pressure difference, the target hydraulic support is controlled to continue performing the backwashing operation, and the number of backwashing operations is recorded. After the recorded number of operations reaches the preset backwashing number threshold, if the currently detected pressure difference Y ≥ the fault pressure difference G, it indicates that the pressure difference between the inlet and outlet liquid pressures of the backwash filter is still large. Thus, it can be determined that the previous backwashing was ineffective, and the backwashing module in the controller of the target hydraulic support issues an alarm function to remind the filter element to be replaced. The specific way to issue an alarm can be through sound and light alarms, or by sending a reminder message to the aforementioned host computer; there are no restrictions here.

[0077] As another possible implementation, after the target hydraulic support performs the backwashing operation, the following steps may also be included: first, detect the backwashing frequency of each target hydraulic support per unit time; then, compare the backwashing frequency of each target hydraulic support with the preset fault frequency in the backwashing module; if the backwashing frequency of any target hydraulic support is greater than the fault frequency, control the preset backwashing module of that target hydraulic support to issue an alarm.

[0078] In this example, after automatic backwashing, if the backwashing frequency Q of the hydraulic support per unit time is detected to be greater than or equal to the fault frequency P, it indicates that the backwashing filter has performed multiple backwashing operations. The backwashing filter has an automatic function to detect whether the backwashing effect meets the expected target after each backwashing operation. If the expected target is not met, the backwashing filter will repeat the backwashing operation. Therefore, if the calculated backwashing frequency is greater than or equal to the preset fault frequency, it can be determined that the backwashing filter has performed frequent backwashing, and the backwashing filter may be faulty. Consequently, the backwashing module in the hydraulic support controller will issue an alarm function, reminding the user to replace the filter element. The specific alarm issuance method can be found in the description of the example above.

[0079] Therefore, in the backwashing control method of this embodiment, backwashing is performed by monitoring the hydraulic supports that have reached the washable index, instead of washing all supports at the same time. Based on the actual blockage of each hydraulic support, the backwashing of hydraulic supports that need to be backwashed can be controlled more precisely, while supports that have not met the backwashing conditions are not washed. This is more conducive to the washing configuration of the emulsion and further avoids the waste of emulsion.

[0080] It should be noted that the backwashing control method of this embodiment can run in parallel with the remote configuration control parameters and backwashing procedure control methods in the above embodiments. That is, the above control methods do not affect each other. When the hydraulic support system does not have such a pressure monitoring system, backwashing can be performed simply through the control methods in the above embodiments.

[0081] Based on the above embodiments, in order to further avoid backwashing affecting the automated following of the hydraulic support and ensure the normal operation of the coal mining process, in one embodiment of this application, it can also be determined whether to perform backwashing control according to the condition of the hydraulic support. Figure 7 A flowchart of another specific backwashing control method for a fully mechanized mining face proposed in this application embodiment is shown below. Figure 7 As shown, the method includes the following steps:

[0082] Step S701: Check whether the following speed of each hydraulic support meets the automated following requirements of the working face.

[0083] Specifically, the operators at the working face can determine whether the hydraulic supports need backwashing based on the actual following speed of each hydraulic support on the working face. Normal automated following of the hydraulic supports is only possible when the operating speed of the hydraulic supports meets the coal cutting speed of the coal mining machine. Operators can check whether the following speed of the operating hydraulic supports matches the coal cutting speed of the coal mining machine.

[0084] Step S702: The hydraulic support, whose following speed is controlled to meet the requirements of automated following, performs a backwashing operation.

[0085] Specifically, after determining whether backflushing is necessary, operators at the work site can either stop backflushing for all supports that do not meet the requirements for automated operation, or they can set it to stop for individual supports. If the operator selects a hydraulic support to forgo backflushing, the controller of that hydraulic support will stop the filter from performing backflushing and enter normal operation. If the operator selects some supports for backflushing, the selected supports will begin backflushing.

[0086] It should be noted that the backwashing control method in this embodiment can be set on the controller and also remotely configured in the background control center, that is, remotely configured on the downhole monitoring center host and the ground host. The configuration method can be determined according to actual needs.

[0087] It should also be noted that in various embodiments of the backwashing control method for the fully mechanized mining face in this application, the controller on the hydraulic support performing backwashing can also provide backwashing operation prompts. For example, the audible and visual alarm device on the controller of the support that needs backwashing, as determined by the system, provides audible prompts and flashing lights to remind surrounding workers to prepare for backwashing and pay attention to safety.

[0088] To achieve the above embodiments, this application also proposes a backwashing control system for fully mechanized mining faces. Figure 8 This is a schematic diagram of the backwashing control system for a fully mechanized mining face, as proposed in an embodiment of this application. Figure 8 As shown, the system includes: a detection module 100, a first control module 200, and a second control module 300.

[0089] The detection module 100 is used to detect the current working area of ​​the coal mining machine on the working face.

[0090] The first control module 200 is used to determine whether a backwashing control command sent by the background control center has been received when the coal mining machine is operating in the starting or ending triangular coal working area of ​​the working face. If so, it controls the corresponding hydraulic support to backwash its own backwashing filter according to the backwashing control command.

[0091] The second control module 300 is used to control a preset number of hydraulic supports to backwash their own backwash filters when no backwash control command is received.

[0092] Optionally, in some embodiments, the first control module 200 is further configured to: detect whether each hydraulic support meets the backwashing conditions; and select the hydraulic support that meets the backwashing conditions as the target hydraulic support for performing the backwashing operation.

[0093] Optionally, in some embodiments, the first control module 200 is specifically used to: detect the pressure difference between the inlet pressure and the outlet pressure of the backwash filter of each hydraulic support; compare the pressure difference value corresponding to each hydraulic support with a preset backwash pressure difference; if the pressure difference value corresponding to any hydraulic support is greater than the backwash pressure difference, then determine that any hydraulic support is the target hydraulic support.

[0094] Optionally, in some embodiments, the system further includes a third control module 400, used to detect whether the following speed of each hydraulic support meets the automated following requirements of the working face; and to control the hydraulic supports whose following speed meets the automated following requirements to perform backwashing operations.

[0095] Optionally, in some embodiments, the detection module 100 is specifically used to: install a first signal transmission device on each hydraulic support and install a second signal transmission device on the coal mining machine; determine the number and number of hydraulic supports corresponding to the starting triangular coal working area and the ending triangular coal working area respectively; and determine whether the coal mining machine is in the starting triangular coal working area or the ending triangular coal working area based on the position information transmitted between the first signal transmission device and the second signal transmission device.

[0096] Optionally, in some embodiments, the system further includes an alarm module 500 for alerting the system after a backwashing operation is performed.

[0097] Real-time detection of the differential pressure value after the backwash filter of each target hydraulic support is updated; the updated differential pressure value corresponding to each target hydraulic support is compared with the preset fault differential pressure. If the updated differential pressure value corresponding to any target hydraulic support is greater than the fault differential pressure, the target hydraulic support is controlled to continue to perform the backwash operation; the number of times the backwash operation of any target hydraulic support is executed is recorded; after the number of executions reaches the preset backwash number threshold, if the current differential pressure value of any target hydraulic support is still greater than the fault differential pressure, the preset backwash module of any target hydraulic support is controlled to issue an alarm.

[0098] Optionally, in some embodiments, the alarm module 500 is further configured to: detect the backflush frequency of each target hydraulic support within a unit time after performing the backflush operation; compare the backflush frequency of each target hydraulic support with a preset fault frequency; and if the backflush frequency of any target hydraulic support is greater than the fault frequency, control the preset backflush module of any target hydraulic support to issue an alarm.

[0099] In summary, the backwashing control system for the fully mechanized mining face in this application integrates backwashing with the coal mining process. It controls the hydraulic supports to perform backwashing when the demand for emulsion is low, ensuring the hydraulic fluid requirements of the working face. This avoids the impact of emulsion discharge during backwashing on the hydraulic support's normal operation, ensuring that the support's fluid supply is not insufficient due to emulsion flow loss caused by backwashing. It also reduces the impact of backwashing on the automated operation of the hydraulic supports, achieving a separation between backwashing and the coal mining process, and preventing backwashing from affecting the normal coal mining operation of the hydraulic supports. Furthermore, it avoids unnecessary backwashing, saving backwashing costs.

[0100] To implement the above embodiments, this application also proposes a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to cause the computer to execute the backwashing control method for the fully mechanized mining face described in any one of the above embodiments.

[0101] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. 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.

[0102] 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 application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0103] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0104] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0105] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0106] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0107] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0108] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A backwashing control method for a fully mechanized mining face, characterized in that, Includes the following steps: Detect the current working area of ​​the coal mining machine on the working face; When the coal mining machine is operating in the starting or ending triangular coal working area of ​​the working face, it determines whether it has received a backwashing control command from the background control center. If so, it controls the corresponding hydraulic support to backwash its own backwashing filter according to the backwashing control command. In the absence of the backwash control command, a preset number of hydraulic supports are controlled to backwash their own backwash filters. Before controlling the backwashing of the hydraulic support itself, the following is also included: Check whether each of the hydraulic supports meets the backwashing conditions; Select the hydraulic support that meets the backwashing conditions as the target hydraulic support for performing the backwashing operation; The detection of whether each hydraulic support meets the backwashing conditions includes: The pressure difference between the inlet and outlet pressures of the backwash filter of each hydraulic support is detected. The differential pressure value corresponding to each hydraulic support is compared with the preset recoil differential pressure. If the differential pressure value corresponding to any hydraulic support is greater than the recoil differential pressure, then the hydraulic support is determined to be the target hydraulic support.

2. The method according to claim 1, characterized in that, Also includes: The following speed of each hydraulic support is checked to see if it meets the automated following requirements of the working face; The hydraulic support, whose following speed is controlled to meet the requirements of automated following, performs a backwashing operation.

3. The method according to claim 1, characterized in that, Before detecting the current working area of ​​the coal mining machine on the working face, the method further includes: A first signal transmission device is installed on each of the hydraulic supports, and a second signal transmission device is installed on the coal mining machine; Determine the number and designation of hydraulic supports corresponding to the initial triangular coal working area and the final triangular coal working area, respectively. The detection system identifies the current operating area of ​​the coal mining machine on the working face, including: Based on the location information transmitted between the first signal transmission device and the second signal transmission device, it is determined whether the coal mining machine is in the starting triangular coal working area or the ending triangular coal working area.

4. The method according to claim 1, characterized in that, After performing the backwashing operation, the following is also included: Real-time monitoring of the differential pressure value after the backwash filter of each target hydraulic support is updated; The updated differential pressure value corresponding to each target hydraulic support is compared with the preset fault differential pressure. If the updated differential pressure value corresponding to any target hydraulic support is greater than the fault differential pressure, then the target hydraulic support is controlled to continue to perform the backwashing operation. Record the number of times the backflushing operation is performed on any of the target hydraulic supports; After the number of executions reaches a preset backflush threshold, if the current differential pressure value of any target hydraulic support is still greater than the fault differential pressure, the preset backflush module of any target hydraulic support is controlled to issue an alarm.

5. The method according to claim 1, characterized in that, After performing the backwashing operation, the following is also included: The recoil frequency of each target hydraulic support per unit time is detected; The recoil frequency of each target hydraulic support is compared with a preset fault frequency; If the recoil frequency of any target hydraulic support is greater than the fault frequency, then the preset recoil module of the target hydraulic support is controlled to issue an alarm.

6. A backwashing control system for a fully mechanized mining face, characterized in that, include: The detection module is used to detect the current working area of ​​the coal mining machine on the working face; The first control module is used to determine whether a backwashing control command sent by the background control center is received when the coal mining machine is operating in the starting triangular coal working area or the ending triangular coal working area of ​​the working face. If so, the corresponding hydraulic support is controlled to backwash its own backwashing filter according to the backwashing control command. The second control module is used to control a preset number of hydraulic supports to backwash their own backwash filters when no backwash control command is received. The first control module is further configured to: Check whether each of the hydraulic supports meets the backwashing conditions; Select the hydraulic support that meets the backwashing conditions as the target hydraulic support for performing the backwashing operation; The detection of whether each hydraulic support meets the backwashing conditions includes: The pressure difference between the inlet and outlet pressures of the backwash filter of each hydraulic support is detected. The differential pressure value corresponding to each hydraulic support is compared with the preset recoil differential pressure. If the differential pressure value corresponding to any hydraulic support is greater than the recoil differential pressure, then the hydraulic support is determined to be the target hydraulic support.

7. A non-transitory computer-readable storage medium storing computer instructions, characterized in that, The computer instructions are used to cause the computer to execute the backwashing control method for the fully mechanized mining face according to any one of claims 1-5.

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