CN-121993240-A - Corner hypoxia relieving method based on intelligent curvature regulation and control of arched baffle

CN121993240ACN 121993240 ACN121993240 ACN 121993240ACN-121993240-A

Abstract

The invention provides a corner hypoxia relieving method based on intelligent curvature regulation and control of an arched baffle. According to the method, the bow-shaped baffle is placed at the return air corner in a simulation mode, the wind flow speed is changed, and low-oxygen gas in a low-wind speed area and a small vortex formed by low wind flow speed is taken away by high-wind speed wind flow, so that the problem of low oxygen at the upper corner is relieved, and the ventilation efficiency is dynamically optimal. According to the method, the curvature of the baffle plate can be automatically adjusted according to the real-time air quantity, the air speed and the oxygen concentration data of the corner, the air flow guiding angle and the air flow coverage range can be flexibly changed, the problem that the fixed baffle plate is insufficient in flow guiding or the air flow is disordered when the air quantity of the working face is changed is avoided, and fresh air is accurately conveyed to a low-oxygen area all the time.

Inventors

ZOU QUANLE
LI TENGLONG
MA TENGFEI
LIANG YUNPEI
Ran Qican
LIU YING
YANG YU
XU KE

Assignees

重庆大学

Dates

Publication Date: 20260508
Application Date: 20251230

Claims (6)

1. The method for relieving corner hypoxia based on intelligent curvature regulation of the arched baffle is characterized by comprising the following steps of: the method comprises the steps of S1) obtaining physical geometric dimensions of an underground return air corner and a roadway, guiding the geometric dimensions into fluid simulation software to construct a numerical model, setting the return air corner as an arc boundary in the numerical model to simulate an arc-shaped baffle, guiding low-oxygen gas migration characteristic data to perform multi-working condition simulation calculation, quantitatively analyzing wind flow velocity field distribution and low-oxygen concentration distribution rules of the arc-shaped baffle under different curvature radiuses and baffle heights, extracting baffle form parameters capable of eliminating vortex areas and optimizing the wind speed of the return air corner, constructing a mapping relation database of roadway working condition characteristics and optimal forms of the baffle, and pre-storing the database into a controller; S2) deploying the arched baffle device to a return air corner working position, wherein the controller calls a mapping relation table based on current working condition parameters, determines a target curvature radius and a target height under the current working condition and drives the arched baffle device to execute adjustment; The moving unit comprises a track, travelling wheels and a supporting frame, wherein the track is paved on a top plate or a side wall of an underground roadway; The deformation execution unit comprises an arched baffle body, longitudinal reinforcing ribs, transverse force transfer beams and multi-point driving actuators, wherein the arched baffle body is an arched metal plate, the arched baffle body is axially and vertically arranged, a concave surface faces towards the windward side, the longitudinal reinforcing ribs are fixedly connected with the leeward surface of the arched baffle body at intervals along the vertical direction, the transverse force transfer beams are horizontally and fixedly connected between the adjacent longitudinal reinforcing ribs to form a crisscrossed grid framework, a plurality of groups of multi-point driving actuators are distributed between the transverse force transfer beams and a rigid mounting backboard along the vertical direction, one end of each driving actuator is hinged to the rigid mounting backboard of a supporting frame through a universal joint, and the other end of each driving actuator is locked on the transverse force transfer beam, so that the supporting frame is used as a fixed reference to apply pushing force or pulling force to the transverse force transfer beams; the intelligent control unit comprises a sensor group and a controller, wherein the sensor group comprises a displacement sensor arranged at a joint of the transverse force transmission beam, a curvature sensor arranged on the surface of the arched baffle body, and a wind speed and oxygen concentration sensor arranged at a return air corner; s3) in the air guiding process, the controller controls the driving actuator to conduct differential expansion and contraction according to real-time data fed back by the sensor, the back of the arched baffle body is applied with force to enable the arched baffle body to rigidly deform, the arched baffle body generates non-uniform rigid expansion and contraction deformation to approach a target form, continuous and accurate air guiding is achieved, and low-oxygen gas in a low-wind speed area and small vortex is taken away by high-wind-speed wind flow.
2. The method for alleviating corner hypoxia based on intelligent regulation of curvature of arched baffle according to claim 1, wherein the hypoxia gas migration characteristic data comprises inlet wind speed, hypoxia gas flooding source term and boundary conditions.
3. The corner hypoxia relieving method based on intelligent regulation and control of the curvature of the arched baffle plate, which is disclosed in claim 1, is characterized in that the driving actuator is a servo electric push rod, the controller calculates the target elongation of each driving actuator through an inverse kinematics algorithm according to the target curvature, and the controller controls the driving actuators to synchronously act so as to push the arched baffle plate body to rigidly stretch and deform.
4. The corner hypoxia relieving method based on intelligent regulation and control of the curvature of the arched baffle plate is characterized by further comprising a telescopic execution unit, wherein for height regulation, the telescopic execution unit is driven to act to change the vertical physical span of an arched baffle plate body, the arched baffle plate body adopts a telescopic nested structure, the arched baffle plate body is divided into an upper baffle plate part and a lower baffle plate part, the upper baffle plate part and the lower baffle plate part are connected in a sliding mode through guide rails, the lower baffle plate part can move up and down along the upper baffle plate part, the telescopic execution unit is arranged in an inner cavity between the upper baffle plate part and the lower baffle plate part, two ends of the telescopic execution unit are hinged to the upper baffle plate part and the lower baffle plate part respectively and used for driving the lower baffle plate part to lift, a telescopic oil cylinder is adopted by the telescopic execution unit, when the oil cylinder stretches out, the lower baffle plate slides downwards relative to the upper baffle plate, the whole physical height is increased, and otherwise, the telescopic execution unit is decreased.
5. The method for relieving corner hypoxia based on intelligent regulation and control of curvature of arched baffle according to claim 1, wherein the arched baffle body is made of spring steel or alloy steel.
6. The intelligent regulation and control corner hypoxia relief method of claim 1 wherein in step 1), the Fluent-based simulation modeling has the following sub-steps: a) Importing field geometric data; b) Setting an arc baffle model at the position of a return air corner, and establishing a three-dimensional numerical model of the U-shaped ventilation system; c) Performing grid division on the geometric model; d) According to the field-measured low-oxygen gas data and factors affecting migration and distribution of the low-oxygen gas data, writing a UDM function, introducing a Fluent computing module and setting related parameters; e) Defining inlet wind speed, outlet pressure, wall roughness and gas component boundary conditions of the model, and simulating an actual ventilation environment; f) Performing Fluent calculation to simulate the influence of baffles with different curvature radiuses and heights on the return air corner airflow field; g) And screening out the optimal baffle curvature range capable of effectively eliminating vortex and improving wind speed based on the calculation result.

Description

Corner hypoxia relieving method based on intelligent curvature regulation and control of arched baffle Technical Field The invention relates to the technical field of underground coal mine return air, in particular to a corner hypoxia relieving method based on intelligent curvature regulation and control of an arched baffle. Background The problem of hypoxia in mine return air corners has become an important hidden trouble restricting the safe production of coal mines. To solve this problem, it is most common practice to hang a curtain at the return air corner or to provide a physical barrier to the wind deflector. However, there are significant technical drawbacks in practical applications: A. Conventional windshields and curtains are typically rigid structures or have only a simple degree of rotational freedom. The core logic of these facilities is to reduce the amount of emission by physically blocking the air leakage path of the goaf. However, this approach is rough in the intervention of the wind flow field and is very prone to creating new vortex areas behind or at the edges of the baffles. This results in the hypoxia gas not being eliminated, but instead the shift of position occurs, and the hidden trouble cannot be fundamentally treated. Particularly when gas emission exists at corners, the mode can prevent the gas from diffusing to the main wind flow; B. The coal face is continuously propelled along with the mining operation, and the section size, the roof subsidence amount and the windage of the underground roadway are dynamically changed. The prior art cannot adapt to such complex and variable conditions. Once the roadway space shape is changed, the baffle plates with fixed shapes are difficult to effectively attach, so that the blocking failure or the diversion effect is poor, frequent manual shutdown maintenance and adjustment are needed, and the production efficiency is seriously affected. C. the adjustment of existing windshields is judged by manual experience or is based on simple threshold control alone. The method lacks of real-time sensing and accurate calculation of the shape of the complex wind flow field, cannot make optimal shape adjustment according to continuous changes of the wind quantity, the wind speed and the section, and is difficult to realize dynamic optimal control of ventilation efficiency. Therefore, there is a need to develop a corner hypoxia relief method based on intelligent regulation of curvature of the arcuate baffles. Disclosure of Invention The invention aims to provide a corner hypoxia relieving method based on intelligent curvature regulation of an arched baffle plate, so as to solve the problems in the prior art. The technical scheme adopted for realizing the purpose of the invention is that the corner hypoxia relieving method based on the intelligent curvature regulation of the arched baffle plate comprises the following steps: s1) acquiring physical geometric dimensions of a down-hole return air corner and a roadway. The geometry is imported into the fluid simulation software to build a numerical model. In the numerical model, return air corners were set as arcuate boundaries to simulate arcuate baffles. And introducing low oxygen gas migration characteristic data to perform multi-working-condition simulation calculation. And quantitatively analyzing the distribution rules of wind flow velocity fields and low oxygen concentration distribution of the arched baffles under different curvature radiuses and baffle heights, and extracting the morphological parameters of the baffles which can eliminate vortex areas and optimize the wind speed of return air corners. Constructing a mapping relation database of roadway working condition characteristics and baffle optimal forms, and pre-storing the database into a controller. S2) deploying the arcuate flap device to a return air corner operating position. The controller calls the mapping relation table based on the current working condition parameters, determines the target curvature radius and the target height under the current working condition, and drives the arched baffle device to execute adjustment. The arched baffle device comprises a moving unit, a deformation executing unit and an intelligent control unit. The mobile unit includes a track, a road wheel, and a support frame. The track is paved on the top plate or the side wall of the underground roadway. The supporting frame is arranged on the rail through the traveling wheel frame and is used for bearing the deformation executing unit and driving the deformation executing unit to move. The support frame has a vertically disposed rigid mounting back plate. The deformation execution unit comprises an arched baffle body, a longitudinal reinforcing rib, a transverse force transfer beam and a multi-point driving actuator. The arched baffle body is an arched metal plate. The arc-shaped baffle body is vertically arranged in the axial direction, and the concave surfac