A linkage control method for a rotary vane damper and a reverse wind locking device

Abstract

The application discloses a linkage control method of a rotary vane air door and a reverse air locking device, and relates to the technical field of mine reverse air control; in order to solve the problems that the existing mine reverse air operation relies on manual operation, is tedious, time-consuming and has a safety blind area, the application comprises the following steps: step one, after receiving a one-key reverse air instruction, self-inspecting a reverse air flow path; step two, verifying the function of a hydraulic-driven reverse air locking device; step three, completing final compression of an explosion-proof cover, linkage switching of a reverse air door and starting of a fan, and monitoring pressure, a signal to the position, fan parameters and gas concentration in real time throughout the process, and automatically resetting to an initial state after the reverse air is finished; the application realizes intelligentization and automation of the reverse air operation, eliminates safety hazards of manual operation, ensures continuous air flow and reliable sealing in the reverse air process, effectively solves the problems that the traditional reverse air operation is tedious, time-consuming and has a safety blind area, and improves the safety and reliability of a mine ventilation system.

Description

Technical Field

[0001] This invention relates to the field of mine reverse ventilation control technology, specifically a linkage control method for a rotary damper and a reverse ventilation interlocking device. Background Technology

[0002] As a core facility for safe production in coal mines, the main ventilation system plays a crucial role in supplying fresh air underground and expelling toxic and harmful gases such as methane. Its stability and reliability directly affect the safety of underground workers and the production efficiency of coal mining enterprises, playing an irreplaceable role in preventing methane accumulation and curbing major safety accidents. Currently, most mines adopt a configuration of one main and one standby ventilation fan and a traditional shutdown and switching mode, i.e., stopping the operating machine first, then starting the standby machine and completing the switch. Meanwhile, on-site air doors are mostly old mechanical structures with poor sealing and often require manual on-site operation. Sensors and monitoring systems have limited functionality and insufficient reliability, leading to frequent communication interruptions and data misinterpretations. This results in short-term ventilation stoppages or weak ventilation during shutdown and switching processes, posing a risk of methane accumulation or even exceeding limits in high-methane mines or deep mining faces within a very short time. The standby machine is usually a cold-start component with low reliability; if the standby machine fails to start and the original machine has already stopped, it can easily create safety hazards. Summary of the Invention

[0003] To address the problems in related technologies, this invention provides a linkage control method for a rotary damper and a reverse air interlocking device, thereby overcoming the aforementioned technical problems in existing related technologies.

[0004] To solve the aforementioned technical problem, the present invention is achieved through the following technical solution: a linkage control method for a rotary damper and a reversing interlocking device, comprising: Step 1: After receiving the one-click reverse airflow command, perform a self-check on the reverse airflow path; if the self-check passes, proceed to Step 2; if the self-check fails, a reverse airflow failure signal will be fed back and the system will be manually inspected and then retried.

[0005] Step 2: After the self-test passes, determine the status of the hydraulic station and perform no-load cycle verification on the reverse air interlock device; when the cycle verification passes, proceed to Step 3; Step 3: Complete the final tightening of the explosion-proof cover, accurately switch the reverse airflow path, and start the fan to establish reverse airflow. At the same time, monitor and control the entire process in real time.

[0006] Preferably, the self-test process in step one includes: S1-1: Safety pre-check, read gas sensor, emergency stop signal, smoke and fire alarm signal. If any of them are abnormal, the self-check will fail. S1-2: Check the online status of the equipment, send heartbeat detection packets to all devices to confirm normal communication; S1-3: Mechanical position consistency check, read the position of the damper encoder and the status of the limit switch, and confirm that the damper and the locking device are in the expected position; S1-4: Adaptive test of damper mechanical transmission. Test displacement commands are generated and executed to each damper in a low-speed limiting manner, and the pass rate is determined based on the test results.

[0007] Preferably, S1-4 further includes: S1-4-1: Obtain the static constraint parameters for each damper, including the allowable opening range, minimum test step size, maximum single step size, allowable peak current of the actuator, allowable maximum speed, acceleration / deceleration limits, allowable response time, allowable settling time, and damper type; S1-4-2: Microstep probing is used to issue displacement commands in both directions, record the actual displacement, peak current, response time and hysteresis, identify the mechanical dead zone and use it as the starting point reference for subsequent sequences; S1-4-3: Determine the initial displacement based on the dead zone, generate the initial test sequence using an incremental factor, and obtain the candidate test sequence by correcting it according to the damper type; S1-4-4: Determine the accuracy, current safety, and timeliness requirements of each step in the candidate sequence, and dynamically adjust the subsequent increment factor and speed. If all steps in the candidate sequence pass, the damper test is deemed qualified.

[0008] Preferably, the specific method of dynamic adjustment in S1-4-4 is as follows: based on the comparison of the peak value of the driver current and the settling time of the most recently passed step with respect to the preset peak range and settling range, the increment factor is increased or decreased, and the speed is mapped proportionally according to the displacement magnitude, and all motions adopt an S-shaped acceleration and deceleration curve, wherein the process of increasing or decreasing the increment factor is as follows: Several incrementing factors are preset, and the incrementing factors are separated by an order of magnitude, where the order of magnitude refers to the difference between two adjacent incrementing factors. For each step i in the candidate test sequence, where i is a positive integer representing the index of the step in the candidate test sequence, the target displacement command θi is first issued to the damper actuator according to the preset speed curve. During and after each step of movement, motion data is collected and stored in real time. The specific motion data includes: actual arrival angle, peak actuator current, actual response time, and actual settling time. The following unified process is followed: First, a target displacement command is issued at a set speed and acceleration. After the movement is completed, the peak value of the drive current, the actual arrival angle, the stabilization time, and the position hysteresis are collected and stored in real time. The judgment condition consists of three main indicators: the ratio of the actual arrival displacement to the expected arrival displacement of the command meets a preset ratio range. In the application scenario of this embodiment, the ratio range is set to [90%, 105%]. The peak value of the drive current does not exceed a preset ratio of the allowable peak current. In this embodiment, the preset ratio is set to 60%. The actual response time and actual stabilization time of the test action are less than the corresponding allowable response time and allowable stabilization time, respectively. If all three conditions are met, the step is marked as passed. Then, the pass step closest to the current time is selected, and the peak value of the drive current and the actual stabilization time of the pass step are extracted. The preset peak range and stabilization range should be noted. It should be noted that the peak range and stabilization range are set based on the static constraints of the damper. Specifically, the peak range is [30%F, 50%F], and the stabilization range is [40%T, 79%T], where F is the allowable peak current of the drive in the static constraints. T represents the allowable settling time. If the peak value of the driver current in the most recent pass step is less than the minimum value of the peak interval, and the actual settling time is less than the minimum value of the settling interval, then the increment factor is increased by an order of magnitude to accelerate the testing process. If the peak value of the driver current is greater than the maximum value of the peak interval, or the actual settling time is greater than the maximum value of the settling interval, then the increment factor is decreased by an order of magnitude to prevent subsequent steps from reaching the protection limit. In other cases, the increment factor of the previous pass step is retained. The target position of each step is always limited by the maximum single-step size in the static constraints. Simultaneously, the allowable speed is dynamically mapped according to the displacement amount, and three levels of displacement intervals are preset: small displacement, medium displacement, and large displacement. In this embodiment, small displacement represents a displacement of less than 2°, medium displacement represents a displacement between 2° and 5°, and large displacement represents a displacement greater than 5°. Small displacement uses low speed, i.e., 20% of the rated speed; medium displacement uses medium speed, i.e., 50% of the rated speed; and large displacement uses high speed, i.e., 80% of the rated speed. The maximum allowable speed of the static constraints must never be exceeded. The rated speed refers to the rated speed of the damper actuator. Once all steps in the candidate test sequence have been executed, if all steps are successful, the mechanical transmission test of the damper is deemed qualified. If any step fails, all movement of the damper is stopped, and the damper is slowly reset to its initial position before the test. If the reset fails, the current position is locked, the self-check of the reverse airflow path is deemed to have failed, and manual intervention is prompted for repair.

[0009] Preferably, the no-load cycle verification of the reverse wind interlocking device in step two includes: S2-1: Read the hydraulic station's oil level, oil pressure, and oil temperature, and determine whether they are within the normal range. If so, proceed to step S2-2. S2-2: If there are any reverse air interlock devices in a compressed state, first reset them to the loose state, confirm that all reverse air interlock devices are loosened and the pressure drops back to the standby range, and then proceed to step S2-3. S2-3: Perform one tightening and loosening cycle, and monitor the arrival signal and pressure changes; S2-4: Repeat S2-3 three times. If all three are successful, the verification is passed; otherwise, manual intervention is required.

[0010] Preferably, the successful pressing condition in S2-3 is: all anti-wind interlocking devices report that the pressing is in place and the pressure is stable within the normal working pressure range within a specified time; the successful releasing condition is: all devices report that the releasing is in place and the pressure drops back to the standby pressure range within a specified time.

[0011] Preferably, step three includes: S3-1: Send a clamping command to the hydraulic station to drive all reverse ventilation interlocking devices to simultaneously clamp the explosion-proof cover, monitor the pressure rise time and the arrival signal, and terminate the process if the clamping time exceeds the time limit. S3-2: According to the preset reverse wind direction, close the horizontal test damper in sequence, close the non-participating reverse wind side vertical mesh damper, and open the participating reverse wind side vertical mesh damper. The arrival signal is monitored at each step, and the process is terminated if the timeout is exceeded. S3-3: After all dampers are in place and successfully locked, start the reverse ventilation fan, monitor the fan parameters and gas concentration, and automatically shut down if any abnormality occurs; S3-4: After the reverse ventilation ends, reset the damper in the reverse order and release the anti-locking device to confirm that it has returned to the initial state.

[0012] Preferably, the method for calculating the pressing time in S3-1 is as follows: sort the pressure according to the monitoring time, calculate the time it takes for the pressure to first enter the normal working pressure range and remain stable, and if the time is greater than the preset pressing reaction time, it is determined that the pressing time has exceeded the limit.

[0013] Preferably, in S3-2, the determination condition for successful closure of the horizontal test damper is that the encoder angle is ≤1° and the limit switch is closed in the closed position; the determination condition for successful closure of the vertical mesh damper is that the encoder angle is ≤1° and the limit switch is closed in the closed position; the determination condition for successful opening of the vertical mesh damper is that the encoder angle is ≥89° and the limit switch is closed in the open position.

[0014] The present invention has the following beneficial effects: 1. By setting up multi-level safety pre-checks, communication and online verification, mechanical position consistency verification, and identification-based adaptive testing of damper mechanical transmission, a self-checking closed loop that can be reversed, recorded, and verified is formed. Before the formal pressurized linkage switching, potential hazards that may cause the machine to fail are identified and blocked at the ground level as much as possible, thereby improving the reliability of the machine preparation work.

[0015] 2. By reading the status parameters of the hydraulic station and performing three tightening and loosening no-load cycle tests, the working performance of the hydraulic system and the operational reliability of the locking device are fully verified. During the test, pressure changes and positioning signals are monitored in real time to ensure that the clamping device operates synchronously and the pressure is stable. By repeating the cycle, occasional faults are eliminated, and the reliability of the locking system is improved. The no-load operation test ensures that the explosion-proof cover can be reliably tightened and sealed during reverse ventilation, preventing airflow short circuits and providing a solid guarantee for airflow sealing during reverse ventilation.

[0016] 3. The system automates the final tightening of the interlocking device, the linkage switching of the dampers, and the start-up of the fan through sequential control, while monitoring pressure, position signals, fan parameters, and gas concentration in real time throughout the process to ensure accurate establishment and safe operation of the reverse ventilation path. During damper switching, the system precisely controls the opening and closing of the horizontal test damper and the vertical mesh damper according to the preset reverse ventilation direction to prevent airflow short circuits. After the reverse ventilation ends, the system automatically resets to the initial state, achieving intelligent and unmanned operation of the entire reverse ventilation process and shortening the preparation time for reverse ventilation. At the same time, the linkage interlocking and door position protection strategies can prevent dampers from being pushed back, interlocking failure, or sudden changes in airflow during the reverse ventilation process, improving the overall safety and automation level of ventilation switching.

[0017] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, the drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 The present invention provides a flowchart of a linkage control method for a rotary damper and a reverse air interlocking device. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] To address the problems mentioned in the background section, such as Figure 1 As shown, this embodiment of the invention provides a linkage control method for a rotary damper and a reverse air interlocking device, specifically including: Step 1: Upon receiving a one-click reverse airflow command, the system automatically performs a self-check on the reverse airflow path. If the self-check passes, proceed to Step 2; otherwise, if the self-check fails, a reverse airflow failure signal is sent, and the reverse airflow path is manually inspected. After inspection, the system returns to perform the self-check until it passes. The self-check process for the reverse airflow path includes: S1-1 First, a safety pre-check is performed. The actions are to read the gas sensor array, emergency stop input, and smoke fire alarm signal. The information obtained from the above actions is observed and compared. If any gas sensor reading exceeds the gas limit or the emergency stop signal or smoke fire alarm signal is triggered, the safety pre-check fails and is retried after manual inspection. Otherwise, the safety pre-check is successful and the next step is executed. S1-2, under the premise of meeting the safety pre-check, poll and confirm the online status of the equipment in the reverse airflow path. The equipment mainly includes damper actuators and interlockers; the sensors include wind speed probes, door encoders, and door limit switches. Send heartbeat detection packets to all equipment in the reverse airflow path. If any equipment fails to return a valid communication frame within the specified time, it is determined that the communication is interrupted, the self-test fails, and the equipment with communication abnormality is output. Manual troubleshooting and retry are required; otherwise, the equipment communication status is normal, and proceed to the next step. S1-3, under normal communication conditions, read the current encoder position value and corresponding limit switch status of each rotary damper; simultaneously read the limit switch status of each reverse air interlock device, and determine whether the encoder position and limit switch status are consistent. Specifically: if the encoder display angle is close to 0°, the limit switch status should be closed; if they are inconsistent, the mechanical position is determined to be abnormal, the self-test fails, and the encoder with abnormal limit status is output for manual repair and retry; otherwise, it indicates that the limit switch status is normal, and proceed to the next step. S1-4, To ensure the flexible, stable, and reliable operation of the damper mechanical transmission, test displacement commands are adaptively generated for each damper on the reverse airflow path using a low-speed, limited-amplitude method. Mechanical transmission tests are then performed on each damper based on these test displacement commands. If the test passes, it indicates successful self-checking of the reverse airflow path, and step two is then executed; specifically including: S1-4-1, Obtain the static constraint parameters for each damper. Specific static constraint parameters include the allowable opening range, minimum test step size, maximum single-step step size, allowable peak current of the actuator, allowable maximum speed and acceleration / deceleration limits, allowable response time, allowable settling time, and damper type. It should be noted that the allowable response time refers to the maximum time from command issuance to the encoder feedback first entering the allowable error band of the target position, and the allowable settling time refers to the maximum time from command issuance to encoder feedback stabilizing within the allowable error band and no longer oscillating. The static constraint parameters serve as both safety protection limits and the initial boundaries of the adaptive algorithm. S1-4-2 employs a minimum range safety microstepping test, issuing displacement commands at extremely small angles in both directions at low speed and limited acceleration. The feedback quantities for each action are observed and recorded: actual displacement, peak actuator current, response time, and position hysteresis after stabilization. The purpose of the microstepping test is to accurately identify mechanical dead zones and backlash, estimate the initial torque caused by static friction or friction, obtain the baseline of the no-load current, and determine the time constant and steady-state error of the door under extremely small displacements. If the microstepping test exhibits abnormalities such as encoder non-response, current limiting, or trigger limit, the identification process is immediately stopped and the device is returned for maintenance. If the microstepping test shows a significant dead zone or hysteresis, this value is recorded as the minimum effective action threshold of the damper and used as the starting point benchmark for subsequent displacement test sequences. S1-4-3, the first step of the test sequence is to take the minimum displacement that can overcome the dead zone with a safety margin. If the identification indicates the existence of a dead zone, the initial displacement is equal to the dead zone angle plus the specified margin; otherwise, the initial displacement can be twice the minimum test step size. Subsequently, a conservative multiplication factor increment strategy is adopted, with several increment factors preset, each spaced one order of magnitude apart. The order of magnitude refers to the difference between two adjacent increment factors. In this embodiment, the increment factors are: 1.5, 1.6, 1.7, 1.8, 1.9, and 2.0, with an order of magnitude of 0.1. However, each step is limited to the maximum value of a single step under static constraints, and the speed corresponding to each step should be mapped to the allowable speed range according to the displacement magnitude. This allows for the use of lower speeds for smaller step sizes and higher, but still limited, speeds for larger step sizes. It should be noted that when performing low-speed limiting tests on the control damper... All test movements are launched using smooth S-shaped acceleration and deceleration curves to avoid impact torque; this allows for the output of initial test sequences for each damper. Different correction rules are preset for different damper types. It should be noted that different types of dampers have different mechanical transmissions. To make the generated test sequences more suitable for different types of dampers, the specific measures are as follows: servo-driven dampers allow for faster acceleration and smaller margins; stepper or reduction gear drives use smaller increments and slower speeds; pneumatic or hydraulic drives further reduce speeds and extend the stabilization judgment time. The initial test sequences are corrected according to the correction rules corresponding to the damper type to obtain candidate test sequences. The candidate test sequences are structurally designed to gradually cover small displacements that can cross the dead zone to small and medium displacements of the representative working range, rather than covering the entire stroke at once, so as to evaluate the damper response in real time at each step and adjust the strategy when necessary. S1-4-4: For each step i in the candidate test sequence, where i is a positive integer representing the index of the step in the candidate test sequence; firstly, a target displacement command θi is issued to the damper actuator according to a preset speed curve. During and after each step of movement, motion data is collected and stored in real time. The specific motion data includes: actual arrival angle, peak actuator current, actual response time, and actual settling time. The following unified process is followed: First, a target displacement command is issued at a set speed and acceleration. After the movement is completed, the peak value of the driving current, the actual arrival angle, the stabilization time, and the position hysteresis are collected and stored in real time. The judgment criteria consist of three main indicators: the actual arrival displacement should meet the preset ratio range of the expected arrival displacement command. In the application scenario of this embodiment, the ratio range is set to [90%, 105%]. The peak value of the driving current does not exceed the preset ratio of the allowable peak current. In this embodiment, the preset ratio is set to 60%, and the actual response time and actual stabilization time of the test action are respectively less than 100%. The corresponding allowable response time and allowable settling time are considered; if all three conditions are met, the step is marked as passed; then, the passable step closest to the current time is selected, and the driver current peak value and actual settling time of the passable step are extracted; the preset peak range and settling range are noted, and it should be noted that the peak range and settling range are set based on the damper's static constraints. Specifically, the peak range is [30%F, 50%F], and the settling range is [40%T, 79%T], where F is the allowable peak current of the driver in the static constraints, and T is the allowable settling time; the driver current peak value of the passable step closest to the current time is... When the value is less than the minimum value of the peak interval and the actual settling time is less than the minimum value of the settling interval, it indicates that the damper's mechanical condition is good. In this case, the increment factor is increased by one order of magnitude to accelerate the testing process. When the peak value of the driver current is greater than the maximum value of the peak interval or the actual settling time is greater than the maximum value of the settling interval, it indicates that the safety boundary is approaching. In this case, the increment factor is decreased by one order of magnitude to prevent subsequent steps from reaching the protection limit. In other cases, the increment factor of the previous successful step is maintained. It should be noted that the target position of each step is always limited by the maximum single-step size in the static constraints, and the dynamic mapping based on the displacement allows... The speed is preset to three levels of displacement range: small displacement, medium displacement, and large displacement. In this embodiment, small displacement refers to a displacement of less than 2°, medium displacement refers to a displacement between 2° and 5°, and large displacement refers to a displacement of more than 5°. Small displacement uses low speed, i.e., 20% of the rated speed; medium displacement uses medium speed, i.e., 50% of the rated speed; and large displacement uses high speed, i.e., 80% of the rated speed. The speed must never exceed the maximum allowable speed under static constraints. All speed changes are achieved through S-shaped acceleration and deceleration curves to ensure smooth start-up and shutdown. The rated speed refers to the rated speed of the damper actuator. Once all steps in the candidate test sequence have been executed, if all steps are passed, the mechanical transmission test of the damper is deemed qualified. If any step fails, all movement of the damper is stopped, and the damper is slowly reset to its initial position before the test. If the reset fails, the current position is locked, the self-check of the reverse airflow path is deemed to have failed, and manual intervention is prompted for repair. Only when the mechanical transmission test of all dampers on the reverse airflow path is qualified will step two be executed. By setting up multi-level safety pre-checks, communication and online verification, mechanical position consistency verification, and identification-based adaptive testing of damper mechanical transmission, a self-checking closed loop that can be reversed, recorded, and verified is formed. Before the official pressurized linkage switching, potential hazards that may cause the machine to fail are identified and blocked at the ground level as much as possible, thereby improving the reliability of the machine preparation work.

[0022] Step two: After all the mechanical transmission tests of the dampers on the reverse airflow path have passed, verify the function of the interlocking device, which specifically includes: S2-1, Read the status parameters of the hydraulic station, including oil level, oil pressure, and oil temperature. When all status parameters meet the requirements, specifically, the oil level is between the set high and low alarm thresholds. In this embodiment, the high and low alarm thresholds are set to 60% to 80% of the oil tank volume; the oil pressure well is stable within the normal working pressure range. In this embodiment, the normal working pressure range is set to 8 to 12 MPa; and the oil temperature well is within the allowable working temperature range. In this embodiment, the working temperature range is set to 10°C to 60°C. S2-2: If the oil level, oil pressure, and oil temperature all meet the requirements, it indicates that the hydraulic station is working normally and has the conditions to perform the locking action. On this basis, a no-load action test is performed on the reverse air locking device. Otherwise, the locking device verification fails, and manual intervention is prompted for repair. The specific no-load action test includes: reading the current position signal of all reverse air locking devices. If any reverse air locking device is in a pressed state, it is controlled to be released, so that all reverse air locking devices are reset to the released state. The release position limit signal of each reverse air locking device is read again. At this time, the reading of the hydraulic station pressure sensor should fall back to the standby pressure range. In this embodiment, the standby pressure range is set to 0~2MPa. If all reverse air locking devices report that they are released and the pressure is within the standby pressure range within the specified time, it indicates that the initial release is successful, and proceed to the next step S2-3. Otherwise, the no-load action test is judged to have failed, and manual intervention is prompted for repair. S2-3: A clamping command is sent to the hydraulic station controller to control the reverse ventilation interlocking device to be in the clamping state. During the clamping process, the rising edge of the clamping limit signal of each reverse ventilation interlocking device and the hydraulic station pressure rise curve are monitored in real time. If all reverse ventilation interlocking devices report that they are clamped in place within the specified time and the pressure is stable within the normal working pressure range, the clamping is considered successful, and the actual clamping time is recorded. Otherwise, the clamping is stopped, and manual intervention is prompted for repair. After clamping in place, a release command is immediately sent again, and the release limit signal of each reverse ventilation interlocking device and the hydraulic station pressure are monitored. If all reverse ventilation interlocking devices report that they are released in place within the specified time and the pressure drops back to the standby pressure range, the release and reset is considered successful. Otherwise, the current limit is maintained, and manual intervention is prompted for repair. S2-4, repeat the above steps S2-3 three times, that is, repeat the cycle of tightening and loosening three times. If all three cycles are successful, it means that the no-load operation test is successful and complete. If any step fails, the test will be terminated, the current safe state will be maintained, the installation state will be that all anti-wind interlocking devices are loosened, and manual intervention and repair will be prompted. By reading the status parameters of the hydraulic station and performing three tightening and loosening no-load cycle tests, the working performance of the hydraulic system and the operational reliability of the locking device are fully verified. During the test, pressure changes and positioning signals are monitored in real time to ensure that the clamping device operates synchronously and the pressure is stable. By repeating the cycle, occasional faults are eliminated, and the reliability of the locking system is improved. The no-load operation test ensures that the explosion-proof cover can be reliably tightened and sealed during reverse ventilation, preventing airflow short circuits and providing a solid guarantee for airflow sealing during reverse ventilation.

[0023] Step 3: Complete the final tightening of the explosion-proof cover, accurately switch the reverse airflow path, and start the fan to establish reverse airflow. Simultaneously, monitor the entire process in real time and implement safety interlock control. Specifically: S3-1: A clamping command is sent to the hydraulic station controller, starting the hydraulic station motor and controlling the solenoid directional valve to extend the cylinder, driving all reverse ventilation interlocking devices to synchronously clamp the explosion-proof cover. During this process, the pressure of the hydraulic station is monitored in real time, and the limit signals of all reverse ventilation interlocking devices are polled. The pressures are arranged in chronological order according to the monitoring time, and the time it takes for the pressure to first reach and stabilize within the normal working pressure range during the clamping process is calculated to obtain the clamping time. If the clamping time is higher than the preset clamping reaction time, it indicates that the hydraulic system response is too slow, which may be due to abnormalities such as oil circuit blockage, pump efficiency reduction, or internal leakage. In this case, the reverse ventilation process is terminated, and all reverse ventilation interlocking devices are reset to the loosened state, awaiting manual maintenance. If the clamping time is less than or equal to the preset clamping reaction time, and the limit signals of all reverse ventilation interlocking devices are in the clamped position, it means that all reverse ventilation interlocking devices are clamped in the position within the specified time. In this case, the interlocking clamping is recorded as successful, and the process proceeds to S3-2. S3-2, according to the preset reverse airflow direction, perform the damper switching in the following order to ensure the correct establishment of the airflow path. It should be noted that the dampers involved in the reverse airflow path in this embodiment include horizontal self-sealing rotary blade test dampers and vertical self-sealing rotary blade mesh dampers. The horizontal self-sealing rotary blade test damper, or simply the horizontal test damper, is located on the air inlet side of the fan and is used for air short-circuiting. It is closed during normal ventilation. The vertical self-sealing rotary blade mesh damper, or simply the vertical mesh damper, consists of two sets, corresponding to the No. 1 and No. 2 main ventilation fans respectively, and is used to control the connection and disconnection between the fan and the underground air duct. During normal ventilation, the mesh damper on the operating fan side is open, and the mesh damper on the standby fan side is closed. The damper switching process is described in this embodiment: First, the horizontal self-sealing rotary vane test damper (i.e., the air-to-air damper) is closed to prevent airflow from short-circuiting and being discharged into the atmosphere from the fan inlet during reverse ventilation. A closing command is sent to the horizontal test damper, and the damper encoder position and the closed limit signal are read. If the encoder angle is ≤1° (in this embodiment, it is set to 1°), and the closed limit is closed, then the closure is considered successful. If there is a timeout or the closed limit signal is abnormal... If all actions are stopped immediately, the current damper state is maintained, and the process terminates. Next, the non-reverse-wind side vertical mesh damper is closed: according to the preset reverse-wind direction, a closing command is sent to the corresponding vertical mesh damper, monitoring the encoder position and the closed limit signal. If the encoder angle is less than or equal to the preset angle within a specified time, and the closed limit is closed, the closure is considered successful; otherwise, the process terminates. Then, the reverse-wind side vertical mesh damper is opened, and an opening command is sent to the damper on the reverse-wind side, monitoring the encoder position and the open limit signal. If the encoder angle is close to the full stroke (set to ≥89° in this embodiment) within a specified time, and the open limit is closed, the opening is considered successful; otherwise, the process terminates. If other auxiliary dampers exist, such as reverse-wind duct flap doors, the corresponding opening and closing actions are executed according to the preset logic, and the position signal is monitored. If a timeout or abnormality occurs, the process also terminates. S3-3: After all air doors are in position and successfully locked, an automatic start signal is sent to the frequency converter or high-voltage starter cabinet of the designated fan. The operator can manually click the start button for the reverse ventilation fan or start the fan automatically according to the preset parameters. During the fan start-up process, the fan current, speed, and vibration are monitored in real time to ensure normal start-up. After the fan runs stably, the data from the wind speed sensor and negative pressure sensor in the air duct are continuously read to verify whether the reverse ventilation volume meets the requirements of the "Coal Mine Safety Regulations", that is, the reverse ventilation volume is not less than 40% of the normal ventilation volume. At the same time, the gas concentration at key points underground is monitored in real time. If the gas exceeds the limit, an audible and visual alarm is immediately issued and the fan is automatically stopped. If any air door position signal is lost, the locking device pressure is abnormal, or the reverse ventilation locking device position signal disappears during operation, the safety interlock is immediately triggered, the fan is stopped, and an alarm is triggered. S3-4, When the reverse ventilation task is completed, the following reset procedure is automatically executed: A shutdown command is sent to the fan, and the fan is confirmed to have stopped running; then, in the reverse order of switching, the vertical mesh damper on the side involved in reverse ventilation is closed first, then the vertical mesh damper on the side not involved in reverse ventilation is opened, and finally the horizontal self-sealing swivel test damper is opened. The positioning signal is monitored at each step. If the timeout is exceeded, an alarm is triggered and the reset procedure is paused. A release command is sent to the hydraulic station to retract all reverse ventilation interlocking devices. The positioning signal is monitored and the pressure drops back to the standby pressure range. If the timeout is exceeded or the pressure is abnormal, subsequent actions are immediately stopped to maintain the current safe state and prompt manual intervention for repair; finally, it is confirmed that all equipment has returned to the initial state before reverse ventilation, thus completing this reverse ventilation.

[0024] The system automates the final tightening of the interlocking device, the linkage switching of the dampers, and the start-up of the fan through sequential control, while monitoring pressure, position signals, fan parameters, and gas concentration in real time throughout the process to ensure accurate establishment and safe operation of the reverse ventilation path. During damper switching, the system precisely controls the opening and closing of the horizontal test damper and the vertical mesh damper according to the preset reverse ventilation direction to prevent airflow short circuits. After the reverse ventilation ends, the system automatically resets to the initial state, realizing intelligent and unmanned operation of the entire reverse ventilation process and shortening the reverse ventilation preparation time. At the same time, the linkage interlocking and door position protection strategy can prevent dampers from being pushed back, interlocking failure, or sudden changes in airflow during the reverse ventilation process, improving the overall safety and automation level of ventilation switching.

[0025] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0026] The preferred embodiments of the invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention.

Claims

1. A method for linkage control of a rotary damper and a reversing interlocking device, characterized in that, Includes the following steps: Step 1: Upon receiving the one-click reverse airflow command, perform a self-check on the reverse airflow path; if the self-check passes, proceed to Step 2; if the self-check fails, a reverse airflow failure signal is sent and the system is manually inspected and then retried. Step 2: After the self-test passes, determine the status of the hydraulic station and perform no-load cycle verification on the reverse air interlock device; when the cycle verification passes, proceed to Step 3; Step 3: Complete the final tightening of the explosion-proof cover, accurately switch the reverse airflow path, and start the fan to establish reverse airflow. At the same time, monitor and control the entire process in real time.

2. The linkage control method for a rotary damper and a reverse air interlocking device according to claim 1, characterized in that, The self-check process in step one includes: S1-1: Safety pre-check, read gas sensor, emergency stop signal, smoke and fire alarm signal. If any of them are abnormal, the self-check will fail. S1-2: Check the online status of the equipment, send heartbeat detection packets to all devices to confirm normal communication; S1-3: Mechanical position consistency check, read the position of the damper encoder and the status of the limit switch, and confirm that the damper and the locking device are in the expected position; S1-4: Adaptive test of damper mechanical transmission. Test displacement commands are generated and executed to each damper in a low-speed limiting manner, and the pass rate is determined based on the test results.

3. The linkage control method for a rotary damper and a reversing interlocking device according to claim 2, characterized in that, S1-4 further includes: S1-4-1: Obtain the static constraint parameters for each damper, including the allowable opening range, minimum test step size, maximum single step size, allowable peak current of the actuator, allowable maximum speed, acceleration / deceleration limits, allowable response time, allowable settling time, and damper type; S1-4-2: Microstep probing is used to issue displacement commands in both directions, record the actual displacement, peak current, response time and hysteresis, identify the mechanical dead zone and use it as the starting point reference for subsequent sequences; S1-4-3: Determine the initial displacement based on the dead zone, generate the initial test sequence using an incremental factor, and obtain the candidate test sequence by correcting it according to the damper type; S1-4-4: Determine the accuracy, current safety, and timeliness requirements of each step in the candidate sequence, and dynamically adjust the subsequent increment factor and speed. If all steps in the candidate sequence pass, the damper test is deemed qualified.

4. The linkage control method for a rotary damper and a reversing interlocking device according to claim 3, characterized in that, The specific method of dynamic adjustment in S1-4-4 is as follows: based on the comparison of the peak value of the driver current and the stabilization time of the most recently passed step with respect to the preset peak range and stabilization range, the increment factor is increased or decreased, and the speed is mapped proportionally according to the displacement magnitude, and all motions adopt S-shaped acceleration and deceleration curves.

5. The linkage control method for a rotary damper and a reversing interlocking device according to claim 4, characterized in that, The no-load cycle verification of the reverse wind interlocking device in step two includes: S2-1: Read the hydraulic station's oil level, oil pressure, and oil temperature, and determine whether they are within the normal range. If so, proceed to step S2-2. S2-2: If there are any reverse air interlock devices in a compressed state, first reset them to the loose state, confirm that all reverse air interlock devices are loosened and the pressure drops back to the standby range, and then proceed to step S2-3. S2-3: Perform one tightening and loosening cycle, and monitor the arrival signal and pressure changes; S2-4: Repeat S2-3 three times. If all three are successful, the verification is passed; otherwise, manual intervention is required.

6. The linkage control method for a rotary damper and a reversing interlocking device according to claim 5, characterized in that, The successful clamping condition in S2-3 is: all anti-wind interlocking devices report that the clamping is in place and the pressure is stable within the normal working pressure range within a specified time; the successful loosening condition is: all devices report that the loosening is in place and the pressure drops back to the standby pressure range within a specified time.

7. The linkage control method for a rotary damper and a reverse air interlocking device according to claim 6, characterized in that, Step three includes: S3-1: Send a clamping command to the hydraulic station to drive all reverse air interlocking devices to simultaneously clamp the explosion-proof cover, monitor the pressure rise time and the arrival signal, and terminate the process if the clamping time exceeds the time limit. S3-2: According to the preset reverse wind direction, close the horizontal test damper in sequence, close the non-participating reverse wind side vertical mesh damper, and open the participating reverse wind side vertical mesh damper. The arrival signal is monitored at each step, and the process is terminated if the timeout is exceeded. S3-3: After all dampers are in place and successfully locked, start the reverse ventilation fan, monitor the fan parameters and gas concentration, and automatically shut down if any abnormality occurs; S3-4: After the reverse ventilation ends, reset the damper in the reverse order and release the anti-locking device to confirm that it has returned to the initial state.

8. The linkage control method for a rotary damper and a reverse air interlocking device according to claim 7, characterized in that, The method for calculating the clamping time in S3-1 is as follows: sort the pressure according to the monitoring time, calculate the time it takes for the pressure to first enter the normal working pressure range and remain stable, and if this time is greater than the preset clamping reaction time, it is determined that the clamping time has exceeded the limit.

9. The linkage control method for a rotary damper and a reverse air interlocking device according to claim 8, characterized in that, In S3-2, the determination condition for successful closure of the horizontal test damper is that the encoder angle is ≤ preset angle one and the limit switch is closed in the closed position; the determination condition for successful closure of the vertical mesh damper is that the encoder angle is ≤ preset angle one and the limit switch is closed in the closed position; the determination condition for successful opening of the vertical mesh damper is that the encoder angle is ≥ preset angle two and the limit switch is closed in the open position, where preset angle one is less than preset angle two.

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